feat: boot.img.lz4

Dockerfile

@@ -1,16 +1,28 @@
-from golang:1.10.3 as build
+# ------------------------------------------------------------------------
-env pkg novit.nc/direktil/local-server
+from golang:1.11.2 as build
-add . /go/src/${pkg}
-workdir /go/src/${pkg}
-run go vet ./... \
- && go test ./... \
- && go install .
 
-from debian:stable
+env pkg novit.nc/direktil/local-server
-entrypoint ["/bin/local-server"]
+run go get github.com/gobuffalo/packr/packr
+copy vendor /go/src/${pkg}/vendor
+copy cmd    /go/src/${pkg}/cmd
+copy assets /go/src/${pkg}/cmd/dkl-local-server/assets
+workdir /go/src/${pkg}
+run packr -i /go/src/${pkg}/cmd/dkl-local-server \
+ && go test ./... \
+ && go install ./cmd/...
+
+# ------------------------------------------------------------------------
+from debian:stretch
+entrypoint ["/bin/dkl-local-server"]
 
 run apt-get update \
- && apt-get install -y genisoimage grub grub-pc-bin \
+ && apt-get install -y genisoimage gdisk dosfstools util-linux udev \
  && apt-get clean
 
-copy --from=build /go/bin/local-server /bin/
+run yes |apt-get install -y grub2 grub-pc-bin grub-efi-amd64-bin \
+ && apt-get clean
+
+add scripts   /scripts
+add assets    /assets
+add efi-shim/ /shim
+copy --from=build /go/bin/ /bin/

assets/grub.cfg

@@ -0,0 +1,11 @@
+search --no-floppy --set=root --part-label boot --hint $root
+
+insmod all_video
+set timeout=3
+
+set bootdev=PARTNAME=boot
+
+menuentry "Direktil" {
+    linux  /current/vmlinuz direktil.boot=$bootdev
+    initrd /current/initrd
+}

cmd/dkl-local-server/a_main-packr.go

@@ -0,0 +1,12 @@
+// Code generated by github.com/gobuffalo/packr. DO NOT EDIT.
+
+package main
+
+import "github.com/gobuffalo/packr"
+
+// You can use the "packr clean" command to clean up this,
+// and any other packr generated files.
+func init() {
+	packr.PackJSONBytes("./assets", "grub.cfg", "\"c2VhcmNoIC0tbm8tZmxvcHB5IC0tc2V0PXJvb3QgLS1wYXJ0LWxhYmVsIGJvb3QKCmluc21vZCBhbGxfdmlkZW8Kc2V0IHRpbWVvdXQ9MwoKc2V0IGJvb3RkZXY9UEFSVE5BTUU9Ym9vdAoKbWVudWVudHJ5ICJEaXJla3RpbCIgewogICAgbGludXggIC9jdXJyZW50L3ZtbGludXogZGlyZWt0aWwuYm9vdD0kYm9vdGRldgogICAgaW5pdHJkIC9jdXJyZW50L2luaXRyZAp9Cg==\"")
+	packr.PackJSONBytes("./assets", "mbr.bin", "\"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\"")
+}

cmd/dkl-local-server/assets.go

@@ -0,0 +1,11 @@
+package main
+
+import "log"
+
+func asset(name string) []byte {
+	ba, err := assets.Find(name)
+	if err != nil {
+		log.Fatalf("asset find error for %q: %v", name, err)
+	}
+	return ba
+}

cmd/dkl-local-server/boot-img.go

@@ -0,0 +1,144 @@
+package main
+
+import (
+	"archive/tar"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"github.com/pierrec/lz4"
+)
+
+func buildBootImg(out io.Writer, ctx *renderContext) (err error) {
+	bootImg, err := ioutil.TempFile(os.TempDir(), "boot.img-")
+	if err != nil {
+		return
+	}
+	defer rmTempFile(bootImg)
+
+	// 2MB + 2GB + 2MB + 34 sectors
+	bootImg.Truncate(2<<30 + 4<<20 + 34*512)
+
+	// partition
+	err = run("sgdisk",
+		"--new=0:4096:+2G", "--typecode=0:EF00", "-c", "0:boot",
+		"--new=0:0:+2M", "--typecode=0:EF02", "-c", "0:BIOS-BOOT",
+		"--hybrid=1:2", "--print", bootImg.Name())
+	if err != nil {
+		return
+	}
+
+	err = setupBootImage(bootImg, ctx)
+	if err != nil {
+		return
+	}
+
+	// send the result
+	bootImg.Seek(0, os.SEEK_SET)
+
+	lz4Out := lz4.NewWriter(out)
+	io.Copy(lz4Out, bootImg)
+	lz4Out.Close()
+
+	return
+}
+
+func setupBootImage(bootImg *os.File, ctx *renderContext) (err error) {
+	devb, err := exec.Command("losetup", "--find", "--show", "--partscan", bootImg.Name()).CombinedOutput()
+	if err != nil {
+		return
+	}
+
+	dev := strings.TrimSpace(string(devb))
+	defer run("losetup", "-d", dev)
+
+	log.Print("device: ", dev)
+
+	err = run("mkfs.vfat", "-n", "DKLBOOT", dev+"p1")
+	if err != nil {
+		return
+	}
+
+	tempDir := bootImg.Name() + ".p1.mount"
+
+	err = os.Mkdir(tempDir, 0755)
+	if err != nil {
+		return
+	}
+
+	defer func() {
+		log.Print("Removing ", tempDir)
+		os.RemoveAll(tempDir)
+	}()
+
+	err = syscall.Mount(dev+"p1", tempDir, "vfat", 0, "")
+	if err != nil {
+		return
+	}
+
+	defer func() {
+		log.Print("Unmounting ", tempDir)
+		syscall.Unmount(tempDir, 0)
+	}()
+
+	// setup grub
+	err = run("/scripts/grub_install.sh", bootImg.Name(), dev, tempDir)
+	if err != nil {
+		return
+	}
+
+	// add system elements
+	tarOut, tarIn := io.Pipe()
+	go func() {
+		err2 := buildBootTar(tarIn, ctx)
+		tarIn.Close()
+		if err2 != nil {
+			err = err2
+		}
+	}()
+
+	defer tarOut.Close()
+
+	tarRd := tar.NewReader(tarOut)
+
+	for {
+		hdr, err := tarRd.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		log.Print("tar: extracting ", hdr.Name)
+
+		outPath := filepath.Join(tempDir, hdr.Name)
+		os.MkdirAll(filepath.Dir(outPath), 0755)
+
+		f, err := os.Create(outPath)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(f, tarRd)
+		f.Close()
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return
+}
+
+func run(program string, args ...string) (err error) {
+	cmd := exec.Command(program, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}

cmd/dkl-local-server/boot-tar.go

@@ -7,7 +7,6 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 )
 
@@ -25,53 +24,12 @@ func buildBootTar(out io.Writer, ctx *renderContext) (err error) {
 	}
 	defer rmTempFile(grubCfg)
 
-	_, err = grubCfg.WriteString(`
+	_, err = grubCfg.Write(asset("grub.cfg"))
-search --no-floppy --set=root --part-label boot
-
-insmod all_video
-set timeout=3
-
-set bootdev=PARTNAME=boot
-
-menuentry "Direktil" {
-    linux  /current/vmlinuz direktil.boot=$bootdev
-    initrd /current/initrd
-}
-`)
 	if err != nil {
 		return
 	}
 	grubCfg.Close()
 
-	// FIXME including in grub memdisk for now...
-	kernelPath, err := ctx.distFetch("kernels", ctx.Group.Kernel)
-	initrdPath, err := ctx.distFetch("initrd", ctx.Group.Initrd)
-
-	grubMk := func(format string) ([]byte, error) {
-		grubOut, err := ioutil.TempFile(os.TempDir(), "grub.img-")
-		if err != nil {
-			return nil, err
-		}
-		defer rmTempFile(grubOut)
-		if err := grubOut.Close(); err != nil {
-			return nil, err
-		}
-
-		cmd := exec.Command("grub-mkstandalone",
-			"--format="+format,
-			"--output="+grubOut.Name(),
-			"boot/grub/grub.cfg="+grubCfg.Name(),
-			"current/vmlinuz="+kernelPath,
-			"current/initrd="+initrdPath,
-		)
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		if err := cmd.Run(); err != nil {
-			return nil, err
-		}
-		return ioutil.ReadFile(grubOut.Name())
-	}
-
 	arch := tar.NewWriter(out)
 	defer arch.Close()
 
@@ -84,30 +42,6 @@ menuentry "Direktil" {
 		return
 	}
 
-	ba, err := grubMk("x86_64-efi")
-	if err != nil {
-		return err
-	}
-
-	err = archAdd("EFI/boot/bootx64.efi", ba)
-	if err != nil {
-		return
-	}
-
-	if false {
-		// TODO
-		ba, err = grubMk("i386-pc")
-		if err != nil {
-			return err
-		}
-
-		arch.WriteHeader(&tar.Header{
-			Name: "grub.img",
-			Size: int64(len(ba)),
-		})
-		arch.Write(ba)
-	}
-
 	// config
 	cfgBytes, cfg, err := ctx.Config()
 	if err != nil {
@@ -116,15 +50,16 @@ menuentry "Direktil" {
 
 	archAdd("config.yaml", cfgBytes)
 
-	// kernel and initrd
+	// add "current" elements
 	type distCopy struct {
 		Src []string
 		Dst string
 	}
 
+	// kernel and initrd
 	copies := []distCopy{
-		// XXX {Src: []string{"kernels", ctx.Group.Kernel}, Dst: "current/vmlinuz"},
+		{Src: []string{"kernels", ctx.Group.Kernel}, Dst: "current/vmlinuz"},
-		// XXX {Src: []string{"initrd", ctx.Group.Initrd}, Dst: "current/initrd"},
+		{Src: []string{"initrd", ctx.Group.Initrd}, Dst: "current/initrd"},
 	}
 
 	// layers

cmd/dkl-local-server/http.go

@@ -165,6 +165,9 @@ func renderHost(w http.ResponseWriter, r *http.Request, what string, host *clust
 	case "boot.tar":
 		err = renderCtx(w, r, ctx, "boot.tar", buildBootTar)
 
+	case "boot.img.lz4":
+		err = renderCtx(w, r, ctx, what, buildBootImg)
+
 	case "config":
 		err = renderConfig(w, r, ctx)
 

cmd/dkl-local-server/main.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"path/filepath"
 
+	"github.com/gobuffalo/packr"
 	"novit.nc/direktil/pkg/cas"
 )
 
@@ -20,11 +21,15 @@ var (
 	keyFile    = flag.String("tls-key", etcDir+"/server.key", "Server TLS key")
 
 	casStore cas.Store
+
+	assets packr.Box
 )
 
 func main() {
 	flag.Parse()
 
+	assets = packr.NewBox("./assets")
+
 	if *address == "" && *tlsAddress == "" {
 		log.Fatal("no listen address given")
 	}

go.mod

@@ -1,28 +1,16 @@
 module novit.nc/direktil/local-server
 
 require (
-	cloud.google.com/go v0.24.0 // indirect
 	github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e
 	github.com/cloudflare/cfssl v0.0.0-20180705210102-ff56ab5eb62a
-	github.com/go-sql-driver/mysql v1.4.0 // indirect
+	github.com/gobuffalo/packr v1.19.0
 	github.com/golang/protobuf v1.1.0 // indirect
 	github.com/google/certificate-transparency-go v1.0.20 // indirect
-	github.com/googleapis/gax-go v1.0.0 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
-	github.com/mattn/go-sqlite3 v1.9.0 // indirect
+	github.com/pierrec/lz4 v2.0.5+incompatible
-	golang.org/x/build v0.0.0-20180706045728-5a0b491d3d31 // indirect
 	golang.org/x/crypto v0.0.0-20180621125126-a49355c7e3f8 // indirect
-	golang.org/x/net v0.0.0-20180706051357-32a936f46389 // indirect
-	golang.org/x/oauth2 v0.0.0-20180620175406-ef147856a6dd // indirect
-	golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f // indirect
-	golang.org/x/tools v0.0.0-20180706162124-435878328fa3 // indirect
-	google.golang.org/api v0.0.0-20180706000841-61180b1196c9 // indirect
-	google.golang.org/appengine v1.1.0 // indirect
-	google.golang.org/grpc v1.13.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	gopkg.in/yaml.v2 v2.2.1
-	honnef.co/go/tools v0.0.0-20180628101929-85dde8b51d3a // indirect
 	k8s.io/apimachinery v0.0.0-20180808233214-a7b7e4de06b2
-	k8s.io/kubernetes v1.11.2 // indirect
 	novit.nc/direktil/pkg v0.0.0-20180707011528-e82b59c0324d
 )

go.sum

@@ -1,42 +1,50 @@
-cloud.google.com/go v0.24.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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 github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e/go.mod h1:oDpT4efm8tSYHXV5tHSdRvBet/b/QzxZ+XyyPehvm3A=
 github.com/cloudflare/cfssl v0.0.0-20180705210102-ff56ab5eb62a h1:wbCZ8e4WG5hcfVKSyaqobgvEe/uZeVvkbUBX1zgr9kw=
 github.com/cloudflare/cfssl v0.0.0-20180705210102-ff56ab5eb62a/go.mod h1:yMWuSON2oQp+43nFtAV/uvKQIFpSPerB57DCt9t8sSA=
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 github.com/google/certificate-transparency-go v1.0.20/go.mod h1:QeJfpSbVSfYc7RgB3gJFj9cbuQMMchQxrWXz8Ruopmg=
-github.com/googleapis/gax-go v1.0.0/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
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-golang.org/x/net v0.0.0-20180706051357-32a936f46389/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20181102091132-c10e9556a7bc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/oauth2 v0.0.0-20180620175406-ef147856a6dd/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/tools v0.0.0-20180706162124-435878328fa3/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-google.golang.org/api v0.0.0-20180706000841-61180b1196c9/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/grpc v1.13.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20180628101929-85dde8b51d3a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 k8s.io/apimachinery v0.0.0-20180808233214-a7b7e4de06b2 h1:w/5Dvht2Wf4vRaXFDb4cWInymI8NkaMJtrs8UsJyZLI=
 k8s.io/apimachinery v0.0.0-20180808233214-a7b7e4de06b2/go.mod h1:ccL7Eh7zubPUSh9A3USN90/OzHNSVN6zxzde07TDCL0=
-k8s.io/kubernetes v1.11.2 h1:2/lmzYbN17Mr23mX/p4ODMm/MBWTeu2Q1Bvsw82YC40=
-k8s.io/kubernetes v1.11.2/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
 novit.nc/direktil/pkg v0.0.0-20180707011528-e82b59c0324d h1:DMk2j7F+mXAQdZD5ouIxWVosY55RmpRevgCWSikRRzU=
 novit.nc/direktil/pkg v0.0.0-20180707011528-e82b59c0324d/go.mod h1:rbcL+fuxazzipTdJV8t9MW39YsdaK3pSvvhTdI9SXsc=

install-on-metal.sh

@@ -1,37 +1,37 @@
 #! /bin/sh
 
 if [ $# -ne 2 ]; then
-    echo "USAGE: $0 <device> <tar url>"
+    echo "USAGE: $0 <device> <base url>"
 fi
 
 dev=$1
-tar_url=$2
+base_url=$2
 
 : ${MP:=/mnt}
 
 set -ex
 
+mkdir -p $MP
+
 [[ $dev =~ nvme ]] &&
     devp=${dev}p ||
     devp=${dev}
 
-vgdisplay storage || {
+if vgdisplay storage; then
-    sgdisk --clear $dev
+    # the system is already installed, just upgrade
-    sgdisk \
+    mount -t vfat ${devp}1 $MP
-        --new=0:4096:+2G --typecode=0:EF00 -c 0:boot \
+    curl ${base_url}/boot.tar |tar xv -C $MP
-        --new=0:0:+2M    --typecode=0:EF02 -c 0:BIOS-BOOT  \
+    umount $MP
-        --new=0:0:0      --typecode=0:FFFF -c 0:data \
-        --hybrid=1:2 \
-        --print $dev
 
-    mkfs.vfat -n DKLBOOT ${devp}1
+else
+    sgdisk --clear $dev
+
+    curl ${base_url}/boot.img.lz4 |lz4cat >$dev
+
+    sgdisk --move-second-header --new=3:0:0 $dev
 
     pvcreate ${devp}3
     vgcreate storage ${devp}3
-}
+fi
 
 while umount $MP; do true; done
-
-mount -t vfat ${devp}1 $MP
-curl $tar_url |tar xv -C $MP
-umount $MP

scripts/grub_install.sh

@@ -0,0 +1,131 @@
+#!/bin/bash
+
+set -e
+
+disk_image="${1}"
+LOOP_DEV="${2}"
+ESP_DIR="${3}"
+
+# i386-pc or x86_64-efi
+target=${4:-x86_64-efi}
+
+export PATH="/opt/grub/bin:/opt/grub/sbin:$PATH"
+
+info() {
+    echo "INFO:" "$@"
+}
+
+warn() {
+    echo "WARN:" "$@"
+}
+
+cleanup() {
+    if [[ -n "${GRUB_TEMP_DIR}" && -e "${GRUB_TEMP_DIR}" ]]; then
+      rm -r "${GRUB_TEMP_DIR}"
+    fi
+}
+trap cleanup EXIT
+
+info "Installing GRUB in ${disk_image##*/}"
+
+mkdir -p "${ESP_DIR}/grub"
+GRUB_TEMP_DIR="$(mktemp -d)"
+
+devmap="${GRUB_TEMP_DIR}/device.map"
+
+cat >${devmap} <<EOF
+(hd0)   ${LOOP_DEV}
+EOF
+
+mkdir -p "${ESP_DIR}/grub"
+sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${ESP_DIR}/grub/grub.cfg"
+
+info "Generating grub/load.cfg"
+# Include a small initial config in the core image to search for the ESP
+# by filesystem ID in case the platform doesn't provide the boot disk.
+# The existing $root value is given as a hint so it is searched first.
+ESP_FSID=$(grub-probe --device-map=$devmap -t fs_uuid -d "${LOOP_DEV}p1")
+cat > "${ESP_DIR}/grub/load.cfg" <<EOF
+search.fs_uuid ${ESP_FSID} root \$root
+set prefix=(memdisk)
+set
+EOF
+
+# Generate a memdisk containing the appropriately generated grub.cfg. Doing
+# this because we need conflicting default behaviors between verity and
+# non-verity images.
+info "Generating grub.cfg memdisk"
+
+sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${GRUB_TEMP_DIR}/grub.cfg"
+
+mkdir -p "${ESP_DIR}/grub"
+tar cf "${ESP_DIR}/grub/grub.cfg.tar" \
+ -C "${GRUB_TEMP_DIR}" "grub.cfg"
+
+for target in i386-pc x86_64-efi
+do
+    GRUB_SRC="/usr/lib/grub/${target}"
+    GRUB_DIR="grub/${target}"
+
+    [[ -d "${GRUB_SRC}" ]] || die "GRUB not installed at ${GRUB_SRC}"
+
+    info "Compressing modules in ${GRUB_DIR}"
+    mkdir -p "${ESP_DIR}/${GRUB_DIR}"
+    for file in "${GRUB_SRC}"/*{.lst,.mod}; do
+        out="${ESP_DIR}/${GRUB_DIR}/${file##*/}"
+        gzip --best --stdout "${file}" | cat > "${out}"
+    done
+
+    # Modules required to boot a standard configuration
+    CORE_MODULES=( normal search test fat part_gpt search_fs_uuid gzio terminal configfile memdisk tar echo read )
+    #CORE_MODULES+=( search_part_label gptprio )
+
+    # Name of the core image, depends on target
+    CORE_NAME=
+
+    case "${target}" in
+        i386-pc)
+            CORE_MODULES+=( biosdisk serial linux )
+            CORE_NAME="core.img"
+            ;;
+        x86_64-efi)
+            CORE_MODULES+=( serial linuxefi efi_gop efinet verify http tftp )
+            #CORE_MODULES+=( getenv smbios )
+            CORE_NAME="core.efi"
+            ;;
+        *)
+            die_notrace "Unknown GRUB target ${target}"
+            ;;
+    esac
+
+    info "Generating grub/${CORE_NAME}"
+    grub-mkimage \
+        --compression=auto \
+        --format "${target}" \
+        --directory "${GRUB_SRC}" \
+        --config "${ESP_DIR}/grub/load.cfg" \
+        --memdisk "${ESP_DIR}/grub/grub.cfg.tar" \
+        --output "${ESP_DIR}/${GRUB_DIR}/${CORE_NAME}" \
+        "${CORE_MODULES[@]}"
+done
+
+# Now target specific steps to make the system bootable
+info "Installing MBR and the BIOS Boot partition."
+cp "/usr/lib/grub/i386-pc/boot.img" "${ESP_DIR}/grub/i386-pc"
+grub-bios-setup --device-map=$devmap \
+    --directory="${ESP_DIR}/grub/i386-pc" "${LOOP_DEV}"
+
+# backup the MBR
+dd bs=448 count=1 status=none if="${LOOP_DEV}" \
+    of="${ESP_DIR}/grub/mbr.bin"
+
+info "Installing default x86_64 UEFI bootloader."
+mkdir -p "${ESP_DIR}/EFI/boot"
+
+cp "${ESP_DIR}/grub/x86_64-efi/core.efi" \
+    "${ESP_DIR}/EFI/boot/grubx64.efi"
+cp "/shim/BOOTX64.EFI" \
+    "${ESP_DIR}/EFI/boot/bootx64.efi"
+
+cleanup
+trap - EXIT

vendor/github.com/gobuffalo/envy/.env

@@ -0,0 +1,5 @@
+# This is a comment
+# We can use equal or colon notation
+DIR: root
+FLAVOUR: none
+INSIDE_FOLDER=false

vendor/github.com/gobuffalo/envy/.gitignore

@@ -0,0 +1,29 @@
+*.log
+.DS_Store
+doc
+tmp
+pkg
+*.gem
+*.pid
+coverage
+coverage.data
+build/*
+*.pbxuser
+*.mode1v3
+.svn
+profile
+.console_history
+.sass-cache/*
+.rake_tasks~
+*.log.lck
+solr/
+.jhw-cache/
+jhw.*
+*.sublime*
+node_modules/
+dist/
+generated/
+.vendor/
+bin/*
+gin-bin
+.idea/

vendor/github.com/gobuffalo/envy/.gometalinter.json

@@ -0,0 +1,3 @@
+{
+  "Enable": ["vet", "golint", "goimports", "deadcode", "gotype", "ineffassign", "misspell", "nakedret", "unconvert", "megacheck", "varcheck"]
+}

vendor/github.com/gobuffalo/envy/.travis.yml

@@ -0,0 +1,26 @@
+language: go
+
+sudo: false
+
+matrix:
+  include:
+  - go: "1.9.x"
+  - go: "1.10.x"
+  - go: "1.11.x"
+    env:
+      - GO111MODULE=off
+  - go: "1.11.x"
+    env:
+      - GO111MODULE=on
+  - go: "tip"
+    env:
+      - GO111MODULE=off
+  - go: "tip"
+    env:
+      - GO111MODULE=on
+  allow_failures:
+    - go: "tip"
+
+install: make deps
+
+script: make ci-test

vendor/github.com/gobuffalo/envy/LICENSE.txt

@@ -0,0 +1,8 @@
+The MIT License (MIT)
+Copyright (c) 2018 Mark Bates
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/gobuffalo/envy/Makefile

@@ -0,0 +1,46 @@
+TAGS ?= "sqlite"
+GO_BIN ?= go
+
+install:
+	packr
+	$(GO_BIN) install -v .
+
+deps:
+	$(GO_BIN) get github.com/gobuffalo/release
+	$(GO_BIN) get github.com/gobuffalo/packr/packr
+	$(GO_BIN) get -tags ${TAGS} -t ./...
+ifeq ($(GO111MODULE),on)
+	$(GO_BIN) mod tidy
+endif
+
+build:
+	packr
+	$(GO_BIN) build -v .
+
+test:
+	packr
+	$(GO_BIN) test -tags ${TAGS} ./...
+
+ci-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+lint:
+	gometalinter --vendor ./... --deadline=1m --skip=internal
+
+update:
+	$(GO_BIN) get -u -tags ${TAGS}
+ifeq ($(GO111MODULE),on)
+	$(GO_BIN) mod tidy
+endif
+	packr
+	make test
+	make install
+ifeq ($(GO111MODULE),on)
+	$(GO_BIN) mod tidy
+endif
+
+release-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+release:
+	release -y -f version.go

vendor/github.com/gobuffalo/envy/README.md

@@ -0,0 +1,93 @@
+# envy
+[![Build Status](https://travis-ci.org/gobuffalo/envy.svg?branch=master)](https://travis-ci.org/gobuffalo/envy)
+
+Envy makes working with ENV variables in Go trivial.
+
+* Get ENV variables with default values.
+* Set ENV variables safely without affecting the underlying system.
+* Temporarily change ENV vars; useful for testing.
+* Map all of the key/values in the ENV.
+* Loads .env files (by using [godotenv](https://github.com/joho/godotenv/))
+* More!
+
+## Installation
+
+```text
+$ go get -u github.com/gobuffalo/envy
+```
+
+## Usage
+
+```go
+func Test_Get(t *testing.T) {
+	r := require.New(t)
+	r.NotZero(os.Getenv("GOPATH"))
+	r.Equal(os.Getenv("GOPATH"), envy.Get("GOPATH", "foo"))
+	r.Equal("bar", envy.Get("IDONTEXIST", "bar"))
+}
+
+func Test_MustGet(t *testing.T) {
+	r := require.New(t)
+	r.NotZero(os.Getenv("GOPATH"))
+	v, err := envy.MustGet("GOPATH")
+	r.NoError(err)
+	r.Equal(os.Getenv("GOPATH"), v)
+
+	_, err = envy.MustGet("IDONTEXIST")
+	r.Error(err)
+}
+
+func Test_Set(t *testing.T) {
+	r := require.New(t)
+	_, err := envy.MustGet("FOO")
+	r.Error(err)
+
+	envy.Set("FOO", "foo")
+	r.Equal("foo", envy.Get("FOO", "bar"))
+}
+
+func Test_Temp(t *testing.T) {
+	r := require.New(t)
+
+	_, err := envy.MustGet("BAR")
+	r.Error(err)
+
+	envy.Temp(func() {
+		envy.Set("BAR", "foo")
+		r.Equal("foo", envy.Get("BAR", "bar"))
+		_, err = envy.MustGet("BAR")
+		r.NoError(err)
+	})
+
+	_, err = envy.MustGet("BAR")
+	r.Error(err)
+}
+```
+## .env files support
+
+Envy now supports loading `.env` files by using the [godotenv library](https://github.com/joho/godotenv/).
+That means one can use and define multiple `.env` files which will be loaded on-demand. By default, no env files will be loaded. To load one or more, you need to call the `envy.Load` function in one of the following ways:
+
+```go
+envy.Load() // 1
+
+envy.Load("MY_ENV_FILE") // 2
+
+envy.Load(".env", ".env.prod") // 3
+
+envy.Load(".env", "NON_EXISTING_FILE") // 4
+
+// 5
+envy.Load(".env")
+envy.Load("NON_EXISTING_FILE")
+
+// 6
+envy.Load(".env", "NON_EXISTING_FILE", ".env.prod")
+```
+
+1. Will load the default `.env` file
+2. Will load the file `MY_ENV_FILE`, **but not** `.env`
+3. Will load the file `.env`, and after that will load the `.env.prod` file. If any variable is redefined in `. env.prod` it will be overwritten (will contain the `env.prod` value)
+4. Will load the `.env` file and return an error as the second file does not exist. The values in `.env` will be loaded and available.
+5. Same as 4
+6. Will load the `.env` file and return an error as the second file does not exist. The values in `.env` will be loaded and available, **but the ones in** `.env.prod` **won't**.

vendor/github.com/gobuffalo/envy/envy.go

@@ -0,0 +1,249 @@
+/*
+package envy makes working with ENV variables in Go trivial.
+
+* Get ENV variables with default values.
+* Set ENV variables safely without affecting the underlying system.
+* Temporarily change ENV vars; useful for testing.
+* Map all of the key/values in the ENV.
+* Loads .env files (by using [godotenv](https://github.com/joho/godotenv/))
+* More!
+*/
+package envy
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/joho/godotenv"
+)
+
+var gil = &sync.RWMutex{}
+var env = map[string]string{}
+
+// GO111MODULE is ENV for turning mods on/off
+const GO111MODULE = "GO111MODULE"
+
+func init() {
+	Load()
+	loadEnv()
+}
+
+// Load the ENV variables to the env map
+func loadEnv() {
+	gil.Lock()
+	defer gil.Unlock()
+	// Detect the Go version on the user system, not the one that was used to compile the binary
+	v := ""
+	out, err := exec.Command("go", "version").Output()
+	if err == nil {
+		// This will break when Go 2 lands
+		v = strings.Split(string(out), " ")[2][4:]
+	} else {
+		v = runtime.Version()[4:]
+	}
+
+	goRuntimeVersion, _ := strconv.ParseFloat(runtime.Version()[4:], 64)
+
+	goVersion, err := strconv.ParseFloat(v, 64)
+	if err != nil {
+		goVersion = goRuntimeVersion
+	}
+
+	if os.Getenv("GO_ENV") == "" {
+		// if the flag "test.v" is *defined*, we're running as a unit test. Note that we don't care
+		// about v.Value (verbose test mode); we just want to know if the test environment has defined
+		// it. It's also possible that the flags are not yet fully parsed (i.e. flag.Parsed() == false),
+		// so we could not depend on v.Value anyway.
+		//
+		if v := flag.Lookup("test.v"); v != nil {
+			env["GO_ENV"] = "test"
+		}
+	}
+
+	// set the GOPATH if using >= 1.8 and the GOPATH isn't set
+	if goVersion >= 8 && os.Getenv("GOPATH") == "" {
+		out, err := exec.Command("go", "env", "GOPATH").Output()
+		if err == nil {
+			gp := strings.TrimSpace(string(out))
+			os.Setenv("GOPATH", gp)
+		}
+	}
+
+	for _, e := range os.Environ() {
+		pair := strings.Split(e, "=")
+		env[pair[0]] = os.Getenv(pair[0])
+	}
+}
+
+func Mods() bool {
+	return Get(GO111MODULE, "off") == "on"
+}
+
+// Reload the ENV variables. Useful if
+// an external ENV manager has been used
+func Reload() {
+	env = map[string]string{}
+	loadEnv()
+}
+
+// Load .env files. Files will be loaded in the same order that are received.
+// Redefined vars will override previously existing values.
+// IE: envy.Load(".env", "test_env/.env") will result in DIR=test_env
+// If no arg passed, it will try to load a .env file.
+func Load(files ...string) error {
+
+	// If no files received, load the default one
+	if len(files) == 0 {
+		err := godotenv.Overload()
+		if err == nil {
+			Reload()
+		}
+		return err
+	}
+
+	// We received a list of files
+	for _, file := range files {
+
+		// Check if it exists or we can access
+		if _, err := os.Stat(file); err != nil {
+			// It does not exist or we can not access.
+			// Return and stop loading
+			return err
+		}
+
+		// It exists and we have permission. Load it
+		if err := godotenv.Overload(file); err != nil {
+			return err
+		}
+
+		// Reload the env so all new changes are noticed
+		Reload()
+
+	}
+	return nil
+}
+
+// Get a value from the ENV. If it doesn't exist the
+// default value will be returned.
+func Get(key string, value string) string {
+	gil.RLock()
+	defer gil.RUnlock()
+	if v, ok := env[key]; ok {
+		return v
+	}
+	return value
+}
+
+// Get a value from the ENV. If it doesn't exist
+// an error will be returned
+func MustGet(key string) (string, error) {
+	gil.RLock()
+	defer gil.RUnlock()
+	if v, ok := env[key]; ok {
+		return v, nil
+	}
+	return "", fmt.Errorf("could not find ENV var with %s", key)
+}
+
+// Set a value into the ENV. This is NOT permanent. It will
+// only affect values accessed through envy.
+func Set(key string, value string) {
+	gil.Lock()
+	defer gil.Unlock()
+	env[key] = value
+}
+
+// MustSet the value into the underlying ENV, as well as envy.
+// This may return an error if there is a problem setting the
+// underlying ENV value.
+func MustSet(key string, value string) error {
+	gil.Lock()
+	defer gil.Unlock()
+	err := os.Setenv(key, value)
+	if err != nil {
+		return err
+	}
+	env[key] = value
+	return nil
+}
+
+// Map all of the keys/values set in envy.
+func Map() map[string]string {
+	gil.RLock()
+	defer gil.RUnlock()
+	cp := map[string]string{}
+	for k, v := range env {
+		cp[k] = v
+	}
+	return env
+}
+
+// Temp makes a copy of the values and allows operation on
+// those values temporarily during the run of the function.
+// At the end of the function run the copy is discarded and
+// the original values are replaced. This is useful for testing.
+// Warning: This function is NOT safe to use from a goroutine or
+// from code which may access any Get or Set function from a goroutine
+func Temp(f func()) {
+	oenv := env
+	env = map[string]string{}
+	for k, v := range oenv {
+		env[k] = v
+	}
+	defer func() { env = oenv }()
+	f()
+}
+
+func GoPath() string {
+	return Get("GOPATH", "")
+}
+
+func GoBin() string {
+	return Get("GO_BIN", "go")
+}
+
+// GoPaths returns all possible GOPATHS that are set.
+func GoPaths() []string {
+	gp := Get("GOPATH", "")
+	if runtime.GOOS == "windows" {
+		return strings.Split(gp, ";") // Windows uses a different separator
+	}
+	return strings.Split(gp, ":")
+}
+
+func importPath(path string) string {
+	for _, gopath := range GoPaths() {
+		srcpath := filepath.Join(gopath, "src")
+		rel, err := filepath.Rel(srcpath, path)
+		if err == nil {
+			return filepath.ToSlash(rel)
+		}
+	}
+
+	// fallback to trim
+	rel := strings.TrimPrefix(path, filepath.Join(GoPath(), "src"))
+	rel = strings.TrimPrefix(rel, string(filepath.Separator))
+	return filepath.ToSlash(rel)
+}
+
+func CurrentPackage() string {
+	pwd, _ := os.Getwd()
+	return importPath(pwd)
+}
+
+func Environ() []string {
+	gil.RLock()
+	defer gil.RUnlock()
+	var e []string
+	for k, v := range env {
+		e = append(e, fmt.Sprintf("%s=%s", k, v))
+	}
+	return e
+}

vendor/github.com/gobuffalo/envy/go.mod

@@ -0,0 +1,8 @@
+module github.com/gobuffalo/envy
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/joho/godotenv v1.3.0
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.2.2
+)

vendor/github.com/gobuffalo/envy/go.sum

@@ -0,0 +1,8 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
+github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

vendor/github.com/gobuffalo/envy/shoulders.md

@@ -0,0 +1,10 @@
+# github.com/gobuffalo/envy Stands on the Shoulders of Giants
+
+github.com/gobuffalo/envy does not try to reinvent the wheel! Instead, it uses the already great wheels developed by the Go community and puts them all together in the best way possible. Without these giants this project would not be possible. Please make sure to check them out and thank them for all of their hard work.
+
+Thank you to the following **GIANTS**:
+
+
+* [github.com/gobuffalo/envy](https://godoc.org/github.com/gobuffalo/envy)
+
+* [github.com/joho/godotenv](https://godoc.org/github.com/joho/godotenv)

vendor/github.com/gobuffalo/envy/version.go

@@ -0,0 +1,3 @@
+package envy
+
+const Version = "v1.6.7"

vendor/github.com/gobuffalo/packd/.gitignore

@@ -0,0 +1,29 @@
+*.log
+.DS_Store
+doc
+tmp
+pkg
+*.gem
+*.pid
+coverage
+coverage.data
+build/*
+*.pbxuser
+*.mode1v3
+.svn
+profile
+.console_history
+.sass-cache/*
+.rake_tasks~
+*.log.lck
+solr/
+.jhw-cache/
+jhw.*
+*.sublime*
+node_modules/
+dist/
+generated/
+.vendor/
+bin/*
+gin-bin
+.idea/

vendor/github.com/gobuffalo/packd/.gometalinter.json

@@ -0,0 +1,3 @@
+{
+  "Enable": ["vet", "golint", "goimports", "deadcode", "gotype", "ineffassign", "misspell", "nakedret", "unconvert", "megacheck", "varcheck"]
+}

vendor/github.com/gobuffalo/packd/.travis.yml

@@ -0,0 +1,26 @@
+language: go
+
+sudo: false
+
+matrix:
+  include:
+  - go: "1.9.x"
+  - go: "1.10.x"
+  - go: "1.11.x"
+    env:
+      - GO111MODULE=off
+  - go: "1.11.x"
+    env:
+      - GO111MODULE=on
+  - go: "tip"
+    env:
+      - GO111MODULE=off
+  - go: "tip"
+    env:
+      - GO111MODULE=on
+  allow_failures:
+    - go: "tip"
+
+install: make deps
+
+script: make ci-test

vendor/github.com/gobuffalo/packd/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Mark Bates
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/gobuffalo/packd/Makefile

@@ -0,0 +1,55 @@
+TAGS ?= "sqlite"
+GO_BIN ?= go
+
+install:
+	packr
+	$(GO_BIN) install -tags ${TAGS} -v .
+	make tidy
+
+tidy:
+ifeq ($(GO111MODULE),on)
+	$(GO_BIN) mod tidy
+else
+	echo skipping go mod tidy
+endif
+
+deps:
+	$(GO_BIN) get github.com/gobuffalo/release
+	$(GO_BIN) get github.com/gobuffalo/packr/packr
+	$(GO_BIN) get -tags ${TAGS} -t ./...
+	make tidy
+
+build:
+	packr
+	$(GO_BIN) build -v .
+	make tidy
+
+test:
+	packr
+	$(GO_BIN) test -tags ${TAGS} ./...
+	make tidy
+
+ci-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+	make tidy
+
+lint:
+	gometalinter --vendor ./... --deadline=1m --skip=internal
+	make tidy
+
+update:
+	$(GO_BIN) get -u -tags ${TAGS}
+	make tidy
+	packr
+	make test
+	make install
+	make tidy
+
+release-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+	make tidy
+
+release:
+	make tidy
+	release -y -f version.go
+	make tidy

vendor/github.com/gobuffalo/packd/README.md

@@ -0,0 +1,24 @@
+<p align="center"><img src="https://github.com/gobuffalo/buffalo/blob/master/logo.svg" width="360"></p>
+
+<p align="center">
+<a href="https://godoc.org/github.com/gobuffalo/packd"><img src="https://godoc.org/github.com/gobuffalo/packd?status.svg" alt="GoDoc" /></a>
+<a href="https://travis-ci.org/gobuffalo/packd"><img src="https://travis-ci.org/gobuffalo/packd.svg?branch=master" alt="Build Status" /></a>
+<a href="https://goreportcard.com/report/github.com/gobuffalo/packd"><img src="https://goreportcard.com/badge/github.com/gobuffalo/packd" alt="Go Report Card" /></a>
+</p>
+
+# github.com/gobuffalo/packd
+
+This is a collection of interfaces designed to make using [github.com/gobuffalo/packr](https://github.com/gobuffalo/packr) easier, and to make the transition between v1 and v2 as seamless as possible.
+
+They can, and should, be used for testing, alternate Box implementations, etc...
+
+
+## Installation
+
+```bash
+$ go get -u -v github.com/gobuffalo/packd
+```
+
+## Memory Box
+
+The [`packd#MemoryBox`](https://godoc.org/github.com/gobuffalo/packd#MemoryBox) is a complete, thread-safe, implementation of [`packd#Box`](https://godoc.org/github.com/gobuffalo/packd#Box)

vendor/github.com/gobuffalo/packd/file.go

@@ -0,0 +1,104 @@
+package packd
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+var _ File = &virtualFile{}
+var _ io.Reader = &virtualFile{}
+var _ io.Writer = &virtualFile{}
+var _ fmt.Stringer = &virtualFile{}
+
+type virtualFile struct {
+	buf  *bytes.Buffer
+	name string
+	info fileInfo
+}
+
+func (f virtualFile) Name() string {
+	return f.name
+}
+
+func (f virtualFile) Seek(offset int64, whence int) (int64, error) {
+	return -1, nil
+}
+
+func (f virtualFile) FileInfo() (os.FileInfo, error) {
+	return f.info, nil
+}
+
+func (f virtualFile) Close() error {
+	return nil
+}
+
+func (f virtualFile) Readdir(count int) ([]os.FileInfo, error) {
+	return []os.FileInfo{f.info}, nil
+}
+
+func (f virtualFile) Stat() (os.FileInfo, error) {
+	return f.info, nil
+}
+
+func (s *virtualFile) String() string {
+	return s.buf.String()
+}
+
+func (s *virtualFile) Read(p []byte) (int, error) {
+	return s.buf.Read(p)
+}
+
+func (s *virtualFile) Write(p []byte) (int, error) {
+	bb := &bytes.Buffer{}
+	i, err := bb.Write(p)
+	if err != nil {
+		return i, errors.WithStack(err)
+	}
+	s.buf = bb
+	s.info = fileInfo{
+		Path:     s.name,
+		Contents: bb.Bytes(),
+		size:     int64(bb.Len()),
+		modTime:  time.Now(),
+	}
+	return i, nil
+}
+
+// NewDir returns a new "virtual" file
+func NewFile(name string, r io.Reader) (File, error) {
+	bb := &bytes.Buffer{}
+	if r != nil {
+		io.Copy(bb, r)
+	}
+	return &virtualFile{
+		buf:  bb,
+		name: name,
+		info: fileInfo{
+			Path:     name,
+			Contents: bb.Bytes(),
+			size:     int64(bb.Len()),
+			modTime:  time.Now(),
+		},
+	}, nil
+}
+
+// NewDir returns a new "virtual" directory
+func NewDir(name string) (File, error) {
+	bb := &bytes.Buffer{}
+	return &virtualFile{
+		buf:  bb,
+		name: name,
+		info: fileInfo{
+			Path:     name,
+			Contents: bb.Bytes(),
+			size:     int64(bb.Len()),
+			modTime:  time.Now(),
+			isDir:    true,
+		},
+	}, nil
+}

vendor/github.com/gobuffalo/packd/file_info.go

@@ -0,0 +1,40 @@
+package packd
+
+import (
+	"os"
+	"time"
+)
+
+var _ os.FileInfo = fileInfo{}
+
+type fileInfo struct {
+	Path     string
+	Contents []byte
+	size     int64
+	modTime  time.Time
+	isDir    bool
+}
+
+func (f fileInfo) Name() string {
+	return f.Path
+}
+
+func (f fileInfo) Size() int64 {
+	return f.size
+}
+
+func (f fileInfo) Mode() os.FileMode {
+	return 0444
+}
+
+func (f fileInfo) ModTime() time.Time {
+	return f.modTime
+}
+
+func (f fileInfo) IsDir() bool {
+	return f.isDir
+}
+
+func (f fileInfo) Sys() interface{} {
+	return nil
+}

vendor/github.com/gobuffalo/packd/go.mod

@@ -0,0 +1,8 @@
+module github.com/gobuffalo/packd
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pkg/errors v0.8.0
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.2.2
+)

vendor/github.com/gobuffalo/packd/go.sum

@@ -0,0 +1,8 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

vendor/github.com/gobuffalo/packd/interfaces.go

@@ -0,0 +1,79 @@
+package packd
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+type WalkFunc func(string, File) error
+
+// Box represents the entirety of the necessary
+// interfaces to form a "full" box.
+// github.com/gobuffalo/packr#Box is an example of this interface.
+type Box interface {
+	HTTPBox
+	Lister
+	Addable
+	Finder
+	Walkable
+	Haser
+}
+
+type Haser interface {
+	Has(string) bool
+}
+
+type Walkable interface {
+	Walk(wf WalkFunc) error
+	WalkPrefix(prefix string, wf WalkFunc) error
+}
+
+type Finder interface {
+	Find(string) ([]byte, error)
+	FindString(name string) (string, error)
+}
+
+type HTTPBox interface {
+	Open(name string) (http.File, error)
+}
+
+type Lister interface {
+	List() []string
+}
+
+type Addable interface {
+	AddString(path string, t string) error
+	AddBytes(path string, t []byte) error
+}
+
+type SimpleFile interface {
+	fmt.Stringer
+	io.Reader
+	io.Writer
+	Name() string
+}
+
+type HTTPFile interface {
+	SimpleFile
+	io.Closer
+	io.Seeker
+	Readdir(count int) ([]os.FileInfo, error)
+	Stat() (os.FileInfo, error)
+}
+
+type File interface {
+	HTTPFile
+	FileInfo() (os.FileInfo, error)
+}
+
+// LegacyBox represents deprecated methods
+// that older Box implementations might have had.
+// github.com/gobuffalo/packr v1 is an example of a LegacyBox.
+type LegacyBox interface {
+	String(name string) string
+	MustString(name string) (string, error)
+	Bytes(name string) []byte
+	MustBytes(name string) ([]byte, error)
+}

vendor/github.com/gobuffalo/packd/memory_box.go

@@ -0,0 +1,148 @@
+package packd
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+)
+
+var _ Addable = NewMemoryBox()
+var _ Finder = NewMemoryBox()
+var _ Lister = NewMemoryBox()
+var _ HTTPBox = NewMemoryBox()
+var _ Haser = NewMemoryBox()
+var _ Walkable = NewMemoryBox()
+var _ Box = NewMemoryBox()
+
+// MemoryBox is a thread-safe, in-memory, implementation of the Box interface.
+type MemoryBox struct {
+	files *sync.Map
+}
+
+func (m *MemoryBox) Has(path string) bool {
+	_, ok := m.files.Load(path)
+	return ok
+}
+
+func (m *MemoryBox) List() []string {
+	var names []string
+	m.files.Range(func(key interface{}, value interface{}) bool {
+		if s, ok := key.(string); ok {
+			names = append(names, s)
+		}
+		return true
+	})
+
+	sort.Strings(names)
+	return names
+}
+
+func (m *MemoryBox) Open(path string) (http.File, error) {
+	cpath := strings.TrimPrefix(path, "/")
+
+	if filepath.Ext(cpath) == "" {
+		// it's a directory
+		return NewDir(path)
+	}
+
+	if len(cpath) == 0 {
+		cpath = "index.html"
+	}
+
+	b, err := m.Find(cpath)
+	if err != nil {
+		return nil, err
+	}
+
+	cpath = filepath.FromSlash(cpath)
+
+	f, err := NewFile(cpath, bytes.NewReader(b))
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+func (m *MemoryBox) FindString(path string) (string, error) {
+	bb, err := m.Find(path)
+	return string(bb), err
+}
+
+func (m *MemoryBox) Find(path string) ([]byte, error) {
+	res, ok := m.files.Load(strings.ToLower(path))
+	if !ok {
+		return nil, os.ErrNotExist
+	}
+	b, ok := res.([]byte)
+	if !ok {
+		return nil, fmt.Errorf("expected []byte got %T", res)
+	}
+	return b, nil
+}
+
+func (m *MemoryBox) AddString(path string, t string) error {
+	return m.AddBytes(path, []byte(t))
+}
+
+func (m *MemoryBox) AddBytes(path string, t []byte) error {
+	m.files.Store(strings.ToLower(path), t)
+	return nil
+}
+
+func (m *MemoryBox) Walk(wf WalkFunc) error {
+	var err error
+	m.files.Range(func(key interface{}, res interface{}) bool {
+
+		path, ok := key.(string)
+		if !ok {
+			err = fmt.Errorf("expected string got %T", key)
+			return false
+		}
+
+		b, ok := res.([]byte)
+		if !ok {
+			err = fmt.Errorf("expected []byte got %T", res)
+			return false
+		}
+
+		var f File
+		f, err = NewFile(path, bytes.NewReader(b))
+		if err != nil {
+			return false
+		}
+
+		err = wf(path, f)
+		if err != nil {
+			return false
+		}
+
+		return true
+	})
+
+	return err
+}
+
+func (m *MemoryBox) WalkPrefix(pre string, wf WalkFunc) error {
+	return m.Walk(func(path string, file File) error {
+		if strings.HasPrefix(path, pre) {
+			return wf(path, file)
+		}
+		return nil
+	})
+}
+
+func (m *MemoryBox) Remove(path string) {
+	m.files.Delete(path)
+}
+
+// NewMemoryBox returns a configured *MemoryBox
+func NewMemoryBox() *MemoryBox {
+	return &MemoryBox{
+		files: &sync.Map{},
+	}
+}

vendor/github.com/gobuffalo/packd/version.go

@@ -0,0 +1,4 @@
+package packd
+
+// Version of packd
+const Version = "v0.0.1"

vendor/github.com/gobuffalo/packr/.codeclimate.yml

@@ -0,0 +1,20 @@
+---
+engines:
+  golint:
+    enabled: true
+    checks:
+      GoLint/Naming/MixedCaps:
+        enabled: false
+  govet:
+    enabled: true
+  gofmt:
+    enabled: true
+  fixme:
+    enabled: true
+ratings:
+  paths:
+    - "**.go"
+exclude_paths:
+  - "**/*_test.go"
+  - "*_test.go"
+  - "fixtures/"

vendor/github.com/gobuffalo/packr/.gitignore

@@ -0,0 +1,33 @@
+*.log
+.DS_Store
+doc
+tmp
+pkg
+*.gem
+*.pid
+coverage
+coverage.data
+build/*
+*.pbxuser
+*.mode1v3
+.svn
+profile
+.console_history
+.sass-cache/*
+.rake_tasks~
+*.log.lck
+solr/
+.jhw-cache/
+jhw.*
+*.sublime*
+node_modules/
+dist/
+generated/
+.vendor/
+bin/*
+gin-bin
+/packr_darwin_amd64
+/packr_linux_amd64
+.vscode/
+debug.test
+.grifter/

vendor/github.com/gobuffalo/packr/.goreleaser.yml

@@ -0,0 +1,46 @@
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+# Code generated by github.com/gobuffalo/release. DO NOT EDIT.
+# Edit .goreleaser.yml.plush instead
+
+builds:
+-
+  goos:
+    - darwin
+    - linux
+    - windows
+  env:
+    - CGO_ENABLED=0
+  main: ./packr/main.go
+  binary: packr
+
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'
+brew:
+  github:
+    owner: gobuffalo
+    name: homebrew-tap

vendor/github.com/gobuffalo/packr/.travis.yml

@@ -0,0 +1,16 @@
+language: go
+
+sudo: false
+
+go:
+  - 1.9
+  - "1.10"
+  - "1.11"
+  - tip
+
+matrix:
+  allow_failures:
+    - go: 'tip'
+
+script:
+  - make ci-test

vendor/github.com/gobuffalo/packr/LICENSE.txt

@@ -0,0 +1,8 @@
+The MIT License (MIT)
+Copyright (c) 2016 Mark Bates
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/gobuffalo/packr/Makefile

@@ -0,0 +1,36 @@
+TAGS ?= "sqlite"
+GO_BIN ?= go
+
+install: deps
+	packr
+	$(GO_BIN) install -v .
+
+deps:
+	$(GO_BIN) get github.com/gobuffalo/packr/packr
+	$(GO_BIN) get -tags ${TAGS} -t ./...
+
+build: deps
+	packr
+	$(GO_BIN) build -v .
+
+test:
+	packr
+	$(GO_BIN) test -tags ${TAGS} ./...
+
+ci-test: deps
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+lint:
+	gometalinter --vendor ./... --deadline=1m --skip=internal
+
+update:
+	$(GO_BIN) get -u
+	$(GO_BIN) mod tidy
+	packr
+	make test
+
+release-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+release:
+	release -y -f version.go

vendor/github.com/gobuffalo/packr/README.md

@@ -0,0 +1,198 @@
+# packr
+
+[![GoDoc](https://godoc.org/github.com/gobuffalo/packr?status.svg)](https://godoc.org/github.com/gobuffalo/packr)
+
+Packr is a simple solution for bundling static assets inside of Go binaries. Most importantly it does it in a way that is friendly to developers while they are developing.
+
+## Intro Video
+
+To get an idea of the what and why of packr, please enjoy this short video: [https://vimeo.com/219863271](https://vimeo.com/219863271).
+
+## Installation
+
+To install Packr utility
+
+```text
+$ go get -u github.com/gobuffalo/packr/packr
+```
+
+To get the dependency
+
+```text
+$ go get -u github.com/gobuffalo/packr
+```
+
+## Usage
+
+### In Code
+
+The first step in using Packr is to create a new box. A box represents a folder on disk. Once you have a box you can get `string` or `[]byte` representations of the file.
+
+```go
+// set up a new box by giving it a (relative) path to a folder on disk:
+box := packr.NewBox("./templates")
+
+// Get the string representation of a file, or an error if it doesn't exist:
+html, err := box.FindString("index.html")
+
+// Get the []byte representation of a file, or an error if it doesn't exist:
+html, err := box.FindBytes("index.html")
+```
+
+### What is a Box?
+
+A box represents a folder, and any sub-folders, on disk that you want to have access to in your binary. When compiling a binary using the `packr` CLI the contents of the folder will be converted into Go files that can be compiled inside of a "standard" go binary. Inside of the compiled binary the files will be read from memory. When working locally the files will be read directly off of disk. This is a seamless switch that doesn't require any special attention on your part.
+
+#### Example
+
+Assume the follow directory structure:
+
+```
+├── main.go
+└── templates
+    ├── admin
+    │   └── index.html
+    └── index.html
+```
+
+The following program will read the `./templates/admin/index.html` file and print it out.
+
+```go
+package main
+
+import (
+	"fmt"
+
+	"github.com/gobuffalo/packr"
+)
+
+func main() {
+	box := packr.NewBox("./templates")
+
+	s := box.String("admin/index.html")
+	fmt.Println(s)
+}
+```
+
+### Development Made Easy
+
+In order to get static files into a Go binary, those files must first be converted to Go code. To do that, Packr, ships with a few tools to help build binaries. See below.
+
+During development, however, it is painful to have to keep running a tool to compile those files.
+
+Packr uses the following resolution rules when looking for a file:
+
+1. Look for the file in-memory (inside a Go binary)
+1. Look for the file on disk (during development)
+
+Because Packr knows how to fall through to the file system, developers don't need to worry about constantly compiling their static files into a binary. They can work unimpeded.
+
+Packr takes file resolution a step further. When declaring a new box you use a relative path, `./templates`. When Packr receives this call it calculates out the absolute path to that directory. By doing this it means you can be guaranteed that Packr can find your files correctly, even if you're not running in the directory that the box was created in. This helps with the problem of testing, where Go changes the `pwd` for each package, making relative paths difficult to work with. This is not a problem when using Packr.
+
+---
+
+## Usage with HTTP
+
+A box implements the [`http.FileSystem`](https://golang.org/pkg/net/http/#FileSystemhttps://golang.org/pkg/net/http/#FileSystem) interface, meaning it can be used to serve static files.
+
+```go
+package main
+
+import (
+	"net/http"
+
+	"github.com/gobuffalo/packr"
+)
+
+func main() {
+	box := packr.NewBox("./templates")
+
+	http.Handle("/", http.FileServer(box))
+	http.ListenAndServe(":3000", nil)
+}
+```
+
+---
+
+## Building a Binary (the easy way)
+
+When it comes time to build, or install, your Go binary, simply use `packr build` or `packr install` just as you would `go build` or `go install`. All flags for the `go` tool are supported and everything works the way you expect, the only difference is your static assets are now bundled in the generated binary. If you want more control over how this happens, looking at the following section on building binaries (the hard way).
+
+## Building a Binary (the hard way)
+
+Before you build your Go binary, run the `packr` command first. It will look for all the boxes in your code and then generate `.go` files that pack the static files into bytes that can be bundled into the Go binary.
+
+```
+$ packr
+```
+
+Then run your `go build command` like normal.
+
+*NOTE*: It is not recommended to check-in these generated `-packr.go` files. They can be large, and can easily become out of date if not careful. It is recommended that you always run `packr clean` after running the `packr` tool.
+
+#### Cleaning Up
+
+When you're done it is recommended that you run the `packr clean` command. This will remove all of the generated files that Packr created for you.
+
+```
+$ packr clean
+```
+
+Why do you want to do this? Packr first looks to the information stored in these generated files, if the information isn't there it looks to disk. This makes it easy to work with in development.
+
+---
+
+## Building/Moving a portable release
+
+When it comes to building multiple releases you typically want that release to be built in a specific directory.
+
+For example: `./releases`
+
+However, because passing a `.go` file requires absolute paths, we must compile the release in the appropriate absolute path.
+
+```bash
+GOOS=linux GOARCH=amd64 packr build
+```
+
+Now your `project_name` binary will be built at the root of your project dir. Great!
+
+All that is left to do is to move that binary to your release dir:
+
+Linux/macOS/Windows (bash)
+
+```bash
+mv ./project_name ./releases
+```
+
+Windows (cmd):
+
+```cmd
+move ./project_name ./releases
+```
+
+Powershell:
+
+```powershell
+Move-Item -Path .\project_name -Destination .\releases\
+```
+
+If you _target_ for Windows when building don't forget that it's `project_name.exe`
+
+Now you can make multiple releases and all of your needed static files will be available!
+
+#### Summing it up:
+
+Example Script for building to 3 common targets:
+
+```bash
+GOOS=darwin GOARCH=amd64 packr build && mv ./project_name ./releases/darwin-project_name \
+  && GOOS=linux GOARCH=amd64 packr build && mv ./project_name ./releases/linux-project_name \
+  && GOOS=windows GOARCH=386 packr build && mv ./project_name.exe ./releases/project_name.exe \
+  && packr clean
+```
+
+---
+
+## Debugging
+
+The `packr` command passes all arguments down to the underlying `go` command, this includes the `-v` flag to print out `go build` information. Packr looks for the `-v` flag, and will turn on its own verbose logging. This is very useful for trying to understand what the `packr` command is doing when it is run.

vendor/github.com/gobuffalo/packr/box.go

@@ -0,0 +1,231 @@
+package packr
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"github.com/gobuffalo/packd"
+	"github.com/markbates/oncer"
+	"github.com/pkg/errors"
+)
+
+var (
+	// ErrResOutsideBox gets returned in case of the requested resources being outside the box
+	ErrResOutsideBox = errors.New("Can't find a resource outside the box")
+)
+
+var _ packd.Box = Box{}
+var _ packd.HTTPBox = Box{}
+var _ packd.Lister = Box{}
+var _ packd.Addable = Box{}
+var _ packd.Walkable = Box{}
+var _ packd.Finder = Box{}
+var _ packd.LegacyBox = Box{}
+
+// NewBox returns a Box that can be used to
+// retrieve files from either disk or the embedded
+// binary.
+func NewBox(path string) Box {
+	var cd string
+	if !filepath.IsAbs(path) {
+		_, filename, _, _ := runtime.Caller(1)
+		cd = filepath.Dir(filename)
+	}
+
+	// this little hack courtesy of the `-cover` flag!!
+	cov := filepath.Join("_test", "_obj_test")
+	cd = strings.Replace(cd, string(filepath.Separator)+cov, "", 1)
+	if !filepath.IsAbs(cd) && cd != "" {
+		cd = filepath.Join(GoPath(), "src", cd)
+	}
+
+	return Box{
+		Path:       path,
+		callingDir: cd,
+		data:       map[string][]byte{},
+	}
+}
+
+// Box represent a folder on a disk you want to
+// have access to in the built Go binary.
+type Box struct {
+	Path        string
+	callingDir  string
+	data        map[string][]byte
+	directories map[string]bool
+}
+
+// AddString converts t to a byteslice and delegates to AddBytes to add to b.data
+func (b Box) AddString(path string, t string) error {
+	b.AddBytes(path, []byte(t))
+	return nil
+}
+
+// AddBytes sets t in b.data by the given path
+func (b Box) AddBytes(path string, t []byte) error {
+	b.data[path] = t
+	return nil
+}
+
+// String is deprecated. Use Find instead
+func (b Box) String(name string) string {
+	oncer.Deprecate(0, "github.com/gobuffalo/packr#Box.String", "Use github.com/gobuffalo/packr#Box.FindString instead.")
+	bb, _ := b.FindString(name)
+	return bb
+}
+
+// MustString is deprecated. Use FindString instead
+func (b Box) MustString(name string) (string, error) {
+	oncer.Deprecate(0, "github.com/gobuffalo/packr#Box.MustString", "Use github.com/gobuffalo/packr#Box.FindString instead.")
+	return b.FindString(name)
+}
+
+// Bytes is deprecated. Use Find instead
+func (b Box) Bytes(name string) []byte {
+	oncer.Deprecate(0, "github.com/gobuffalo/packr#Box.Bytes", "Use github.com/gobuffalo/packr#Box.Find instead.")
+	bb, _ := b.Find(name)
+	return bb
+}
+
+// Bytes is deprecated. Use Find instead
+func (b Box) MustBytes(name string) ([]byte, error) {
+	oncer.Deprecate(0, "github.com/gobuffalo/packr#Box.MustBytes", "Use github.com/gobuffalo/packr#Box.Find instead.")
+	return b.Find(name)
+}
+
+// FindString returns either the string of the requested
+// file or an error if it can not be found.
+func (b Box) FindString(name string) (string, error) {
+	bb, err := b.Find(name)
+	return string(bb), err
+}
+
+// Find returns either the byte slice of the requested
+// file or an error if it can not be found.
+func (b Box) Find(name string) ([]byte, error) {
+	f, err := b.find(name)
+	if err == nil {
+		bb := &bytes.Buffer{}
+		bb.ReadFrom(f)
+		return bb.Bytes(), err
+	}
+	return nil, err
+}
+
+// Has returns true if the resource exists in the box
+func (b Box) Has(name string) bool {
+	_, err := b.find(name)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+func (b Box) decompress(bb []byte) []byte {
+	reader, err := gzip.NewReader(bytes.NewReader(bb))
+	if err != nil {
+		return bb
+	}
+	data, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return bb
+	}
+	return data
+}
+
+func (b Box) find(name string) (File, error) {
+	if bb, ok := b.data[name]; ok {
+		return packd.NewFile(name, bytes.NewReader(bb))
+	}
+
+	if b.directories == nil {
+		b.indexDirectories()
+	}
+
+	cleanName := filepath.ToSlash(filepath.Clean(name))
+	// Ensure name is not outside the box
+	if strings.HasPrefix(cleanName, "../") {
+		return nil, ErrResOutsideBox
+	}
+	// Absolute name is considered as relative to the box root
+	cleanName = strings.TrimPrefix(cleanName, "/")
+
+	if _, ok := data[b.Path]; ok {
+		if bb, ok := data[b.Path][cleanName]; ok {
+			bb = b.decompress(bb)
+			return packd.NewFile(cleanName, bytes.NewReader(bb))
+		}
+		if _, ok := b.directories[cleanName]; ok {
+			return packd.NewDir(cleanName)
+		}
+		if filepath.Ext(cleanName) != "" {
+			// The Handler created by http.FileSystem checks for those errors and
+			// returns http.StatusNotFound instead of http.StatusInternalServerError.
+			return nil, os.ErrNotExist
+		}
+		return nil, os.ErrNotExist
+	}
+
+	// Not found in the box virtual fs, try to get it from the file system
+	cleanName = filepath.FromSlash(cleanName)
+	p := filepath.Join(b.callingDir, b.Path, cleanName)
+	return fileFor(p, cleanName)
+}
+
+// Open returns a File using the http.File interface
+func (b Box) Open(name string) (http.File, error) {
+	return b.find(name)
+}
+
+// List shows "What's in the box?"
+func (b Box) List() []string {
+	var keys []string
+
+	if b.data == nil || len(b.data) == 0 {
+		b.Walk(func(path string, info File) error {
+			finfo, _ := info.FileInfo()
+			if !finfo.IsDir() {
+				keys = append(keys, finfo.Name())
+			}
+			return nil
+		})
+	} else {
+		for k := range b.data {
+			keys = append(keys, k)
+		}
+	}
+	return keys
+}
+
+func (b *Box) indexDirectories() {
+	b.directories = map[string]bool{}
+	if _, ok := data[b.Path]; ok {
+		for name := range data[b.Path] {
+			prefix, _ := path.Split(name)
+			// Even on Windows the suffix appears to be a /
+			prefix = strings.TrimSuffix(prefix, "/")
+			b.directories[prefix] = true
+		}
+	}
+}
+
+func fileFor(p string, name string) (File, error) {
+	fi, err := os.Stat(p)
+	if err != nil {
+		return nil, err
+	}
+	if fi.IsDir() {
+		return packd.NewDir(p)
+	}
+	if bb, err := ioutil.ReadFile(p); err == nil {
+		return packd.NewFile(name, bytes.NewReader(bb))
+	}
+	return nil, os.ErrNotExist
+}

vendor/github.com/gobuffalo/packr/env.go

@@ -0,0 +1,13 @@
+package packr
+
+import (
+	"github.com/gobuffalo/envy"
+)
+
+// GoPath returns the current GOPATH env var
+// or if it's missing, the default.
+var GoPath = envy.GoPath
+
+// GoBin returns the current GO_BIN env var
+// or if it's missing, a default of "go"
+var GoBin = envy.GoBin

vendor/github.com/gobuffalo/packr/file.go

@@ -0,0 +1,5 @@
+package packr
+
+import "github.com/gobuffalo/packd"
+
+type File = packd.File

vendor/github.com/gobuffalo/packr/go.mod

@@ -0,0 +1,14 @@
+module github.com/gobuffalo/packr
+
+require (
+	github.com/gobuffalo/envy v1.6.7
+	github.com/gobuffalo/packd v0.0.0-20181031195726-c82734870264
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/markbates/oncer v0.0.0-20181014194634-05fccaae8fc4
+	github.com/pkg/errors v0.8.0
+	github.com/spf13/cobra v0.0.3
+	github.com/spf13/pflag v1.0.3 // indirect
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/net v0.0.0-20181102091132-c10e9556a7bc // indirect
+	golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f
+)

vendor/github.com/gobuffalo/packr/go.sum

@@ -0,0 +1,26 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gobuffalo/envy v1.6.7 h1:XMZGuFqTupAXhZTriQ+qO38QvNOSU/0rl3hEPCFci/4=
+github.com/gobuffalo/envy v1.6.7/go.mod h1:N+GkhhZ/93bGZc6ZKhJLP6+m+tCNPKwgSpH9kaifseQ=
+github.com/gobuffalo/packd v0.0.0-20181031195726-c82734870264 h1:roWyi0eEdiFreSqW9V1wT9pNOVzrpo2NWsxja53slX0=
+github.com/gobuffalo/packd v0.0.0-20181031195726-c82734870264/go.mod h1:Yf2toFaISlyQrr5TfO3h6DB9pl9mZRmyvBGQb/aQ/pI=
+github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
+github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
+github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
+github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
+github.com/markbates/oncer v0.0.0-20181014194634-05fccaae8fc4 h1:Mlji5gkcpzkqTROyE4ZxZ8hN7osunMb2RuGVrbvMvCc=
+github.com/markbates/oncer v0.0.0-20181014194634-05fccaae8fc4/go.mod h1:Ld9puTsIW75CHf65OeIOkyKbteujpZVXDpWK6YGZbxE=
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
+github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
+github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/net v0.0.0-20181102091132-c10e9556a7bc h1:ZMCWScCvS2fUVFw8LOpxyUUW5qiviqr4Dg5NdjLeiLU=
+golang.org/x/net v0.0.0-20181102091132-c10e9556a7bc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

vendor/github.com/gobuffalo/packr/packr.go

@@ -0,0 +1,74 @@
+package packr
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	"runtime"
+	"strings"
+	"sync"
+)
+
+var gil = &sync.Mutex{}
+var data = map[string]map[string][]byte{}
+
+// PackBytes packs bytes for a file into a box.
+func PackBytes(box string, name string, bb []byte) {
+	gil.Lock()
+	defer gil.Unlock()
+	if _, ok := data[box]; !ok {
+		data[box] = map[string][]byte{}
+	}
+	data[box][name] = bb
+}
+
+// PackBytesGzip packets the gzipped compressed bytes into a box.
+func PackBytesGzip(box string, name string, bb []byte) error {
+	var buf bytes.Buffer
+	w := gzip.NewWriter(&buf)
+	_, err := w.Write(bb)
+	if err != nil {
+		return err
+	}
+	err = w.Close()
+	if err != nil {
+		return err
+	}
+	PackBytes(box, name, buf.Bytes())
+	return nil
+}
+
+// PackJSONBytes packs JSON encoded bytes for a file into a box.
+func PackJSONBytes(box string, name string, jbb string) error {
+	var bb []byte
+	err := json.Unmarshal([]byte(jbb), &bb)
+	if err != nil {
+		return err
+	}
+	PackBytes(box, name, bb)
+	return nil
+}
+
+// UnpackBytes unpacks bytes for specific box.
+func UnpackBytes(box string) {
+	gil.Lock()
+	defer gil.Unlock()
+	delete(data, box)
+}
+
+func osPaths(paths ...string) []string {
+	if runtime.GOOS == "windows" {
+		for i, path := range paths {
+			paths[i] = strings.Replace(path, "/", "\\", -1)
+		}
+	}
+
+	return paths
+}
+
+func osPath(path string) string {
+	if runtime.GOOS == "windows" {
+		return strings.Replace(path, "/", "\\", -1)
+	}
+	return path
+}

vendor/github.com/gobuffalo/packr/shoulders.md

@@ -0,0 +1,18 @@
+# github.com/gobuffalo/packr Stands on the Shoulders of Giants
+
+github.com/gobuffalo/packr does not try to reinvent the wheel! Instead, it uses the already great wheels developed by the Go community and puts them all together in the best way possible. Without these giants this project would not be possible. Please make sure to check them out and thank them for all of their hard work.
+
+Thank you to the following **GIANTS**:
+
+
+* [github.com/gobuffalo/envy](https://godoc.org/github.com/gobuffalo/envy)
+
+* [github.com/gobuffalo/packd](https://godoc.org/github.com/gobuffalo/packd)
+
+* [github.com/gobuffalo/packr](https://godoc.org/github.com/gobuffalo/packr)
+
+* [github.com/joho/godotenv](https://godoc.org/github.com/joho/godotenv)
+
+* [github.com/markbates/oncer](https://godoc.org/github.com/markbates/oncer)
+
+* [github.com/pkg/errors](https://godoc.org/github.com/pkg/errors)

vendor/github.com/gobuffalo/packr/version.go

@@ -0,0 +1,3 @@
+package packr
+
+const Version = "v1.19.0"

vendor/github.com/gobuffalo/packr/walk.go

@@ -0,0 +1,64 @@
+package packr
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gobuffalo/packd"
+	"github.com/pkg/errors"
+)
+
+type WalkFunc = packd.WalkFunc
+
+// Walk will traverse the box and call the WalkFunc for each file in the box/folder.
+func (b Box) Walk(wf WalkFunc) error {
+	if data[b.Path] == nil {
+		base, err := filepath.EvalSymlinks(filepath.Join(b.callingDir, b.Path))
+		if err != nil {
+			return errors.WithStack(err)
+		}
+		return filepath.Walk(base, func(path string, info os.FileInfo, err error) error {
+			cleanName, err := filepath.Rel(base, path)
+			if err != nil {
+				cleanName = strings.TrimPrefix(path, base)
+			}
+			cleanName = filepath.ToSlash(filepath.Clean(cleanName))
+			cleanName = strings.TrimPrefix(cleanName, "/")
+			cleanName = filepath.FromSlash(cleanName)
+			if info == nil || info.IsDir() {
+				return nil
+			}
+
+			file, err := fileFor(path, cleanName)
+			if err != nil {
+				return err
+			}
+			return wf(cleanName, file)
+		})
+	}
+	for n := range data[b.Path] {
+		f, err := b.find(n)
+		if err != nil {
+			return err
+		}
+		err = wf(n, f)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// WalkPrefix will call box.Walk and call the WalkFunc when it finds paths that have a matching prefix
+func (b Box) WalkPrefix(prefix string, wf WalkFunc) error {
+	opre := osPath(prefix)
+	return b.Walk(func(path string, f File) error {
+		if strings.HasPrefix(osPath(path), opre) {
+			if err := wf(path, f); err != nil {
+				return errors.WithStack(err)
+			}
+		}
+		return nil
+	})
+}

vendor/github.com/joho/godotenv/.gitignore

@@ -0,0 +1 @@
+.DS_Store

vendor/github.com/joho/godotenv/.travis.yml

@@ -0,0 +1,8 @@
+language: go
+
+go:
+  - 1.x
+
+os:
+  - linux
+  - osx

vendor/github.com/joho/godotenv/LICENCE

@@ -0,0 +1,23 @@
+Copyright (c) 2013 John Barton
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

vendor/github.com/joho/godotenv/README.md

@@ -0,0 +1,163 @@
+# GoDotEnv [![Build Status](https://travis-ci.org/joho/godotenv.svg?branch=master)](https://travis-ci.org/joho/godotenv) [![Build status](https://ci.appveyor.com/api/projects/status/9v40vnfvvgde64u4?svg=true)](https://ci.appveyor.com/project/joho/godotenv) [![Go Report Card](https://goreportcard.com/badge/github.com/joho/godotenv)](https://goreportcard.com/report/github.com/joho/godotenv)
+
+A Go (golang) port of the Ruby dotenv project (which loads env vars from a .env file)
+
+From the original Library:
+
+> Storing configuration in the environment is one of the tenets of a twelve-factor app. Anything that is likely to change between deployment environments–such as resource handles for databases or credentials for external services–should be extracted from the code into environment variables.
+>
+> But it is not always practical to set environment variables on development machines or continuous integration servers where multiple projects are run. Dotenv load variables from a .env file into ENV when the environment is bootstrapped.
+
+It can be used as a library (for loading in env for your own daemons etc) or as a bin command.
+
+There is test coverage and CI for both linuxish and windows environments, but I make no guarantees about the bin version working on windows.
+
+## Installation
+
+As a library
+
+```shell
+go get github.com/joho/godotenv
+```
+
+or if you want to use it as a bin command
+```shell
+go get github.com/joho/godotenv/cmd/godotenv
+```
+
+## Usage
+
+Add your application configuration to your `.env` file in the root of your project:
+
+```shell
+S3_BUCKET=YOURS3BUCKET
+SECRET_KEY=YOURSECRETKEYGOESHERE
+```
+
+Then in your Go app you can do something like
+
+```go
+package main
+
+import (
+    "github.com/joho/godotenv"
+    "log"
+    "os"
+)
+
+func main() {
+  err := godotenv.Load()
+  if err != nil {
+    log.Fatal("Error loading .env file")
+  }
+
+  s3Bucket := os.Getenv("S3_BUCKET")
+  secretKey := os.Getenv("SECRET_KEY")
+
+  // now do something with s3 or whatever
+}
+```
+
+If you're even lazier than that, you can just take advantage of the autoload package which will read in `.env` on import
+
+```go
+import _ "github.com/joho/godotenv/autoload"
+```
+
+While `.env` in the project root is the default, you don't have to be constrained, both examples below are 100% legit
+
+```go
+_ = godotenv.Load("somerandomfile")
+_ = godotenv.Load("filenumberone.env", "filenumbertwo.env")
+```
+
+If you want to be really fancy with your env file you can do comments and exports (below is a valid env file)
+
+```shell
+# I am a comment and that is OK
+SOME_VAR=someval
+FOO=BAR # comments at line end are OK too
+export BAR=BAZ
+```
+
+Or finally you can do YAML(ish) style
+
+```yaml
+FOO: bar
+BAR: baz
+```
+
+as a final aside, if you don't want godotenv munging your env you can just get a map back instead
+
+```go
+var myEnv map[string]string
+myEnv, err := godotenv.Read()
+
+s3Bucket := myEnv["S3_BUCKET"]
+```
+
+... or from an `io.Reader` instead of a local file
+
+```go
+reader := getRemoteFile()
+myEnv, err := godotenv.Parse(reader)
+```
+
+... or from a `string` if you so desire
+
+```go
+content := getRemoteFileContent()
+myEnv, err := godotenv.Unmarshal(content)
+```
+
+### Command Mode
+
+Assuming you've installed the command as above and you've got `$GOPATH/bin` in your `$PATH`
+
+```
+godotenv -f /some/path/to/.env some_command with some args
+```
+
+If you don't specify `-f` it will fall back on the default of loading `.env` in `PWD`
+
+### Writing Env Files
+
+Godotenv can also write a map representing the environment to a correctly-formatted and escaped file
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+err := godotenv.Write(env, "./.env")
+```
+
+... or to a string
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+content, err := godotenv.Marshal(env)
+```
+
+## Contributing
+
+Contributions are most welcome! The parser itself is pretty stupidly naive and I wouldn't be surprised if it breaks with edge cases.
+
+*code changes without tests will not be accepted*
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Added some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+
+## Releases
+
+Releases should follow [Semver](http://semver.org/) though the first couple of releases are `v1` and `v1.1`.
+
+Use [annotated tags for all releases](https://github.com/joho/godotenv/issues/30). Example `git tag -a v1.2.1`
+
+## CI
+
+Linux: [![Build Status](https://travis-ci.org/joho/godotenv.svg?branch=master)](https://travis-ci.org/joho/godotenv) Windows: [![Build status](https://ci.appveyor.com/api/projects/status/9v40vnfvvgde64u4)](https://ci.appveyor.com/project/joho/godotenv)
+
+## Who?
+
+The original library [dotenv](https://github.com/bkeepers/dotenv) was written by [Brandon Keepers](http://opensoul.org/), and this port was done by [John Barton](https://johnbarton.co/) based off the tests/fixtures in the original library.

vendor/github.com/joho/godotenv/godotenv.go

@@ -0,0 +1,346 @@
+// Package godotenv is a go port of the ruby dotenv library (https://github.com/bkeepers/dotenv)
+//
+// Examples/readme can be found on the github page at https://github.com/joho/godotenv
+//
+// The TL;DR is that you make a .env file that looks something like
+//
+// 		SOME_ENV_VAR=somevalue
+//
+// and then in your go code you can call
+//
+// 		godotenv.Load()
+//
+// and all the env vars declared in .env will be available through os.Getenv("SOME_ENV_VAR")
+package godotenv
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"regexp"
+	"sort"
+	"strings"
+)
+
+const doubleQuoteSpecialChars = "\\\n\r\"!$`"
+
+// Load will read your env file(s) and load them into ENV for this process.
+//
+// Call this function as close as possible to the start of your program (ideally in main)
+//
+// If you call Load without any args it will default to loading .env in the current path
+//
+// You can otherwise tell it which files to load (there can be more than one) like
+//
+//		godotenv.Load("fileone", "filetwo")
+//
+// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults
+func Load(filenames ...string) (err error) {
+	filenames = filenamesOrDefault(filenames)
+
+	for _, filename := range filenames {
+		err = loadFile(filename, false)
+		if err != nil {
+			return // return early on a spazout
+		}
+	}
+	return
+}
+
+// Overload will read your env file(s) and load them into ENV for this process.
+//
+// Call this function as close as possible to the start of your program (ideally in main)
+//
+// If you call Overload without any args it will default to loading .env in the current path
+//
+// You can otherwise tell it which files to load (there can be more than one) like
+//
+//		godotenv.Overload("fileone", "filetwo")
+//
+// It's important to note this WILL OVERRIDE an env variable that already exists - consider the .env file to forcefilly set all vars.
+func Overload(filenames ...string) (err error) {
+	filenames = filenamesOrDefault(filenames)
+
+	for _, filename := range filenames {
+		err = loadFile(filename, true)
+		if err != nil {
+			return // return early on a spazout
+		}
+	}
+	return
+}
+
+// Read all env (with same file loading semantics as Load) but return values as
+// a map rather than automatically writing values into env
+func Read(filenames ...string) (envMap map[string]string, err error) {
+	filenames = filenamesOrDefault(filenames)
+	envMap = make(map[string]string)
+
+	for _, filename := range filenames {
+		individualEnvMap, individualErr := readFile(filename)
+
+		if individualErr != nil {
+			err = individualErr
+			return // return early on a spazout
+		}
+
+		for key, value := range individualEnvMap {
+			envMap[key] = value
+		}
+	}
+
+	return
+}
+
+// Parse reads an env file from io.Reader, returning a map of keys and values.
+func Parse(r io.Reader) (envMap map[string]string, err error) {
+	envMap = make(map[string]string)
+
+	var lines []string
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	if err = scanner.Err(); err != nil {
+		return
+	}
+
+	for _, fullLine := range lines {
+		if !isIgnoredLine(fullLine) {
+			var key, value string
+			key, value, err = parseLine(fullLine, envMap)
+
+			if err != nil {
+				return
+			}
+			envMap[key] = value
+		}
+	}
+	return
+}
+
+//Unmarshal reads an env file from a string, returning a map of keys and values.
+func Unmarshal(str string) (envMap map[string]string, err error) {
+	return Parse(strings.NewReader(str))
+}
+
+// Exec loads env vars from the specified filenames (empty map falls back to default)
+// then executes the cmd specified.
+//
+// Simply hooks up os.Stdin/err/out to the command and calls Run()
+//
+// If you want more fine grained control over your command it's recommended
+// that you use `Load()` or `Read()` and the `os/exec` package yourself.
+func Exec(filenames []string, cmd string, cmdArgs []string) error {
+	Load(filenames...)
+
+	command := exec.Command(cmd, cmdArgs...)
+	command.Stdin = os.Stdin
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+	return command.Run()
+}
+
+// Write serializes the given environment and writes it to a file
+func Write(envMap map[string]string, filename string) error {
+	content, error := Marshal(envMap)
+	if error != nil {
+		return error
+	}
+	file, error := os.Create(filename)
+	if error != nil {
+		return error
+	}
+	_, err := file.WriteString(content)
+	return err
+}
+
+// Marshal outputs the given environment as a dotenv-formatted environment file.
+// Each line is in the format: KEY="VALUE" where VALUE is backslash-escaped.
+func Marshal(envMap map[string]string) (string, error) {
+	lines := make([]string, 0, len(envMap))
+	for k, v := range envMap {
+		lines = append(lines, fmt.Sprintf(`%s="%s"`, k, doubleQuoteEscape(v)))
+	}
+	sort.Strings(lines)
+	return strings.Join(lines, "\n"), nil
+}
+
+func filenamesOrDefault(filenames []string) []string {
+	if len(filenames) == 0 {
+		return []string{".env"}
+	}
+	return filenames
+}
+
+func loadFile(filename string, overload bool) error {
+	envMap, err := readFile(filename)
+	if err != nil {
+		return err
+	}
+
+	currentEnv := map[string]bool{}
+	rawEnv := os.Environ()
+	for _, rawEnvLine := range rawEnv {
+		key := strings.Split(rawEnvLine, "=")[0]
+		currentEnv[key] = true
+	}
+
+	for key, value := range envMap {
+		if !currentEnv[key] || overload {
+			os.Setenv(key, value)
+		}
+	}
+
+	return nil
+}
+
+func readFile(filename string) (envMap map[string]string, err error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	return Parse(file)
+}
+
+func parseLine(line string, envMap map[string]string) (key string, value string, err error) {
+	if len(line) == 0 {
+		err = errors.New("zero length string")
+		return
+	}
+
+	// ditch the comments (but keep quoted hashes)
+	if strings.Contains(line, "#") {
+		segmentsBetweenHashes := strings.Split(line, "#")
+		quotesAreOpen := false
+		var segmentsToKeep []string
+		for _, segment := range segmentsBetweenHashes {
+			if strings.Count(segment, "\"") == 1 || strings.Count(segment, "'") == 1 {
+				if quotesAreOpen {
+					quotesAreOpen = false
+					segmentsToKeep = append(segmentsToKeep, segment)
+				} else {
+					quotesAreOpen = true
+				}
+			}
+
+			if len(segmentsToKeep) == 0 || quotesAreOpen {
+				segmentsToKeep = append(segmentsToKeep, segment)
+			}
+		}
+
+		line = strings.Join(segmentsToKeep, "#")
+	}
+
+	firstEquals := strings.Index(line, "=")
+	firstColon := strings.Index(line, ":")
+	splitString := strings.SplitN(line, "=", 2)
+	if firstColon != -1 && (firstColon < firstEquals || firstEquals == -1) {
+		//this is a yaml-style line
+		splitString = strings.SplitN(line, ":", 2)
+	}
+
+	if len(splitString) != 2 {
+		err = errors.New("Can't separate key from value")
+		return
+	}
+
+	// Parse the key
+	key = splitString[0]
+	if strings.HasPrefix(key, "export") {
+		key = strings.TrimPrefix(key, "export")
+	}
+	key = strings.Trim(key, " ")
+
+	// Parse the value
+	value = parseValue(splitString[1], envMap)
+	return
+}
+
+func parseValue(value string, envMap map[string]string) string {
+
+	// trim
+	value = strings.Trim(value, " ")
+
+	// check if we've got quoted values or possible escapes
+	if len(value) > 1 {
+		rs := regexp.MustCompile(`\A'(.*)'\z`)
+		singleQuotes := rs.FindStringSubmatch(value)
+
+		rd := regexp.MustCompile(`\A"(.*)"\z`)
+		doubleQuotes := rd.FindStringSubmatch(value)
+
+		if singleQuotes != nil || doubleQuotes != nil {
+			// pull the quotes off the edges
+			value = value[1 : len(value)-1]
+		}
+
+		if doubleQuotes != nil {
+			// expand newlines
+			escapeRegex := regexp.MustCompile(`\\.`)
+			value = escapeRegex.ReplaceAllStringFunc(value, func(match string) string {
+				c := strings.TrimPrefix(match, `\`)
+				switch c {
+				case "n":
+					return "\n"
+				case "r":
+					return "\r"
+				default:
+					return match
+				}
+			})
+			// unescape characters
+			e := regexp.MustCompile(`\\([^$])`)
+			value = e.ReplaceAllString(value, "$1")
+		}
+
+		if singleQuotes == nil {
+			value = expandVariables(value, envMap)
+		}
+	}
+
+	return value
+}
+
+func expandVariables(v string, m map[string]string) string {
+	r := regexp.MustCompile(`(\\)?(\$)(\()?\{?([A-Z0-9_]+)?\}?`)
+
+	return r.ReplaceAllStringFunc(v, func(s string) string {
+		submatch := r.FindStringSubmatch(s)
+
+		if submatch == nil {
+			return s
+		}
+		if submatch[1] == "\\" || submatch[2] == "(" {
+			return submatch[0][1:]
+		} else if submatch[4] != "" {
+			return m[submatch[4]]
+		}
+		return s
+	})
+}
+
+func isIgnoredLine(line string) bool {
+	trimmedLine := strings.Trim(line, " \n\t")
+	return len(trimmedLine) == 0 || strings.HasPrefix(trimmedLine, "#")
+}
+
+func doubleQuoteEscape(line string) string {
+	for _, c := range doubleQuoteSpecialChars {
+		toReplace := "\\" + string(c)
+		if c == '\n' {
+			toReplace = `\n`
+		}
+		if c == '\r' {
+			toReplace = `\r`
+		}
+		line = strings.Replace(line, string(c), toReplace, -1)
+	}
+	return line
+}

vendor/github.com/markbates/oncer/.gitignore

@@ -0,0 +1,29 @@
+*.log
+.DS_Store
+doc
+tmp
+pkg
+*.gem
+*.pid
+coverage
+coverage.data
+build/*
+*.pbxuser
+*.mode1v3
+.svn
+profile
+.console_history
+.sass-cache/*
+.rake_tasks~
+*.log.lck
+solr/
+.jhw-cache/
+jhw.*
+*.sublime*
+node_modules/
+dist/
+generated/
+.vendor/
+bin/*
+gin-bin
+.idea/

vendor/github.com/markbates/oncer/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018 Mark Bates
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/markbates/oncer/Makefile

@@ -0,0 +1,40 @@
+TAGS ?= "sqlite"
+GO_BIN ?= go
+
+install:
+	packr
+	$(GO_BIN) install -v .
+
+deps:
+	$(GO_BIN) get github.com/gobuffalo/release
+	$(GO_BIN) get github.com/gobuffalo/packr/packr
+	$(GO_BIN) get -tags ${TAGS} -t ./...
+	$(GO_BIN) mod tidy
+
+build:
+	packr
+	$(GO_BIN) build -v .
+
+test:
+	packr
+	$(GO_BIN) test -tags ${TAGS} ./...
+
+ci-test: deps
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+lint:
+	gometalinter --vendor ./... --deadline=1m --skip=internal
+
+update:
+	$(GO_BIN) get -u -tags ${TAGS}
+	$(GO_BIN) mod tidy
+	packr
+	make test
+	make install
+	$(GO_BIN) mod tidy
+
+release-test:
+	$(GO_BIN) test -tags ${TAGS} -race ./...
+
+release:
+	release -y -f version.go

vendor/github.com/markbates/oncer/deprecate.go

@@ -0,0 +1,20 @@
+package oncer
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+const deprecated = "DEPRECATED"
+
+var deprecationWriter io.Writer = os.Stdout
+
+func Deprecate(depth int, name string, msg string) {
+	Do(deprecated+name, func() {
+		fmt.Fprintf(deprecationWriter, "[%s] %s has been deprecated.\n", deprecated, name)
+		if len(msg) > 0 {
+			fmt.Fprintf(deprecationWriter, "\t%s\n", msg)
+		}
+	})
+}

vendor/github.com/markbates/oncer/go.mod

@@ -0,0 +1,7 @@
+module github.com/markbates/oncer
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.2.2
+)

vendor/github.com/markbates/oncer/go.sum

@@ -0,0 +1,6 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

vendor/github.com/markbates/oncer/oncer.go

@@ -0,0 +1,26 @@
+package oncer
+
+import (
+	"sync"
+)
+
+var onces = &sync.Map{}
+
+func Do(name string, fn func()) {
+	o, _ := onces.LoadOrStore(name, &sync.Once{})
+	if once, ok := o.(*sync.Once); ok {
+		once.Do(fn)
+	}
+}
+
+func Reset(names ...string) {
+	if len(names) == 0 {
+		onces = &sync.Map{}
+		return
+	}
+
+	for _, n := range names {
+		onces.Delete(n)
+		onces.Delete(deprecated + n)
+	}
+}

vendor/github.com/pierrec/lz4/.gitignore

@@ -0,0 +1,33 @@
+# Created by https://www.gitignore.io/api/macos
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# End of https://www.gitignore.io/api/macos
+
+lz4c/lz4c

vendor/github.com/pierrec/lz4/.travis.yml

@@ -0,0 +1,18 @@
+language: go
+
+go:
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
+  - master
+
+matrix:
+ fast_finish: true
+ allow_failures:
+   - go: master
+
+sudo: false
+
+script: 
+ - go test -v -cpu=2
+ - go test -v -cpu=2 -race

vendor/github.com/pierrec/lz4/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2015, Pierre Curto
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of xxHash nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+

vendor/github.com/pierrec/lz4/README.md

@@ -0,0 +1,24 @@
+[![godoc](https://godoc.org/github.com/pierrec/lz4?status.png)](https://godoc.org/github.com/pierrec/lz4)
+
+# lz4
+LZ4 compression and decompression in pure Go.
+
+## Usage
+
+```go
+import "github.com/pierrec/lz4"
+```
+
+## Description
+Package lz4 implements reading and writing lz4 compressed data (a frame),
+as specified in http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html.
+
+This package is **compatible with the LZ4 frame format** although the block level compression 
+and decompression functions are exposed and are fully compatible with the lz4 block format 
+definition, they are low level and should not be used directly.
+
+For a complete description of an lz4 compressed block, see:
+http://fastcompression.blogspot.fr/2011/05/lz4-explained.html
+
+See https://github.com/Cyan4973/lz4 for the reference C implementation.
+

vendor/github.com/pierrec/lz4/block.go

@@ -0,0 +1,397 @@
+package lz4
+
+import (
+	"encoding/binary"
+	"errors"
+)
+
+var (
+	// ErrInvalidSourceShortBuffer is returned by UncompressBlock or CompressBLock when a compressed
+	// block is corrupted or the destination buffer is not large enough for the uncompressed data.
+	ErrInvalidSourceShortBuffer = errors.New("lz4: invalid source or destination buffer too short")
+	// ErrInvalid is returned when reading an invalid LZ4 archive.
+	ErrInvalid = errors.New("lz4: bad magic number")
+)
+
+// blockHash hashes 4 bytes into a value < winSize.
+func blockHash(x uint32) uint32 {
+	const hasher uint32 = 2654435761 // Knuth multiplicative hash.
+	return x * hasher >> hashShift
+}
+
+// CompressBlockBound returns the maximum size of a given buffer of size n, when not compressible.
+func CompressBlockBound(n int) int {
+	return n + n/255 + 16
+}
+
+// UncompressBlock uncompresses the source buffer into the destination one,
+// and returns the uncompressed size.
+//
+// The destination buffer must be sized appropriately.
+//
+// An error is returned if the source data is invalid or the destination buffer is too small.
+func UncompressBlock(src, dst []byte) (si int, err error) {
+	defer func() {
+		// It is now faster to let the runtime panic and recover on out of bound slice access
+		// than checking indices as we go along.
+		if recover() != nil {
+			err = ErrInvalidSourceShortBuffer
+		}
+	}()
+	sn := len(src)
+	if sn == 0 {
+		return 0, nil
+	}
+	var di int
+
+	for {
+		// Literals and match lengths (token).
+		b := int(src[si])
+		si++
+
+		// Literals.
+		if lLen := b >> 4; lLen > 0 {
+			if lLen == 0xF {
+				for src[si] == 0xFF {
+					lLen += 0xFF
+					si++
+				}
+				lLen += int(src[si])
+				si++
+			}
+			i := si
+			si += lLen
+			di += copy(dst[di:], src[i:si])
+
+			if si >= sn {
+				return di, nil
+			}
+		}
+
+		si++
+		_ = src[si] // Bound check elimination.
+		offset := int(src[si-1]) | int(src[si])<<8
+		si++
+
+		// Match.
+		mLen := b & 0xF
+		if mLen == 0xF {
+			for src[si] == 0xFF {
+				mLen += 0xFF
+				si++
+			}
+			mLen += int(src[si])
+			si++
+		}
+		mLen += minMatch
+
+		// Copy the match.
+		i := di - offset
+		if offset > 0 && mLen >= offset {
+			// Efficiently copy the match dst[di-offset:di] into the dst slice.
+			bytesToCopy := offset * (mLen / offset)
+			expanded := dst[i:]
+			for n := offset; n <= bytesToCopy+offset; n *= 2 {
+				copy(expanded[n:], expanded[:n])
+			}
+			di += bytesToCopy
+			mLen -= bytesToCopy
+		}
+		di += copy(dst[di:], dst[i:i+mLen])
+	}
+}
+
+// CompressBlock compresses the source buffer into the destination one.
+// This is the fast version of LZ4 compression and also the default one.
+// The size of hashTable must be at least 64Kb.
+//
+// The size of the compressed data is returned. If it is 0 and no error, then the data is incompressible.
+//
+// An error is returned if the destination buffer is too small.
+func CompressBlock(src, dst []byte, hashTable []int) (di int, err error) {
+	defer func() {
+		if recover() != nil {
+			err = ErrInvalidSourceShortBuffer
+		}
+	}()
+
+	sn, dn := len(src)-mfLimit, len(dst)
+	if sn <= 0 || dn == 0 {
+		return 0, nil
+	}
+	var si int
+
+	// Fast scan strategy: the hash table only stores the last 4 bytes sequences.
+	// const accInit = 1 << skipStrength
+
+	anchor := si // Position of the current literals.
+	// acc := accInit // Variable step: improves performance on non-compressible data.
+
+	for si < sn {
+		// Hash the next 4 bytes (sequence)...
+		match := binary.LittleEndian.Uint32(src[si:])
+		h := blockHash(match)
+
+		ref := hashTable[h]
+		hashTable[h] = si
+		if ref >= sn { // Invalid reference (dirty hashtable).
+			si++
+			continue
+		}
+		offset := si - ref
+		if offset <= 0 || offset >= winSize || // Out of window.
+			match != binary.LittleEndian.Uint32(src[ref:]) { // Hash collision on different matches.
+			// si += acc >> skipStrength
+			// acc++
+			si++
+			continue
+		}
+
+		// Match found.
+		// acc = accInit
+		lLen := si - anchor // Literal length.
+
+		// Encode match length part 1.
+		si += minMatch
+		mLen := si // Match length has minMatch already.
+		// Find the longest match, first looking by batches of 8 bytes.
+		for si < sn && binary.LittleEndian.Uint64(src[si:]) == binary.LittleEndian.Uint64(src[si-offset:]) {
+			si += 8
+		}
+		// Then byte by byte.
+		for si < sn && src[si] == src[si-offset] {
+			si++
+		}
+
+		mLen = si - mLen
+		if mLen < 0xF {
+			dst[di] = byte(mLen)
+		} else {
+			dst[di] = 0xF
+		}
+
+		// Encode literals length.
+		if lLen < 0xF {
+			dst[di] |= byte(lLen << 4)
+		} else {
+			dst[di] |= 0xF0
+			di++
+			l := lLen - 0xF
+			for ; l >= 0xFF; l -= 0xFF {
+				dst[di] = 0xFF
+				di++
+			}
+			dst[di] = byte(l)
+		}
+		di++
+
+		// Literals.
+		copy(dst[di:], src[anchor:anchor+lLen])
+		di += lLen + 2
+		anchor = si
+
+		// Encode offset.
+		_ = dst[di] // Bound check elimination.
+		dst[di-2], dst[di-1] = byte(offset), byte(offset>>8)
+
+		// Encode match length part 2.
+		if mLen >= 0xF {
+			for mLen -= 0xF; mLen >= 0xFF; mLen -= 0xFF {
+				dst[di] = 0xFF
+				di++
+			}
+			dst[di] = byte(mLen)
+			di++
+		}
+	}
+
+	if anchor == 0 {
+		// Incompressible.
+		return 0, nil
+	}
+
+	// Last literals.
+	lLen := len(src) - anchor
+	if lLen < 0xF {
+		dst[di] = byte(lLen << 4)
+	} else {
+		dst[di] = 0xF0
+		di++
+		for lLen -= 0xF; lLen >= 0xFF; lLen -= 0xFF {
+			dst[di] = 0xFF
+			di++
+		}
+		dst[di] = byte(lLen)
+	}
+	di++
+
+	// Write the last literals.
+	if di >= anchor {
+		// Incompressible.
+		return 0, nil
+	}
+	di += copy(dst[di:], src[anchor:])
+	return di, nil
+}
+
+// CompressBlockHC compresses the source buffer src into the destination dst
+// with max search depth (use 0 or negative value for no max).
+//
+// CompressBlockHC compression ratio is better than CompressBlock but it is also slower.
+//
+// The size of the compressed data is returned. If it is 0 and no error, then the data is not compressible.
+//
+// An error is returned if the destination buffer is too small.
+func CompressBlockHC(src, dst []byte, depth int) (di int, err error) {
+	defer func() {
+		if recover() != nil {
+			err = ErrInvalidSourceShortBuffer
+		}
+	}()
+
+	sn, dn := len(src)-mfLimit, len(dst)
+	if sn <= 0 || dn == 0 {
+		return 0, nil
+	}
+	var si int
+
+	// hashTable: stores the last position found for a given hash
+	// chaingTable: stores previous positions for a given hash
+	var hashTable, chainTable [winSize]int
+
+	if depth <= 0 {
+		depth = winSize
+	}
+
+	anchor := si
+	for si < sn {
+		// Hash the next 4 bytes (sequence).
+		match := binary.LittleEndian.Uint32(src[si:])
+		h := blockHash(match)
+
+		// Follow the chain until out of window and give the longest match.
+		mLen := 0
+		offset := 0
+		for next, try := hashTable[h], depth; try > 0 && next > 0 && si-next < winSize; next = chainTable[next&winMask] {
+			// The first (mLen==0) or next byte (mLen>=minMatch) at current match length
+			// must match to improve on the match length.
+			if src[next+mLen] != src[si+mLen] {
+				continue
+			}
+			ml := 0
+			// Compare the current position with a previous with the same hash.
+			for ml < sn-si && binary.LittleEndian.Uint64(src[next+ml:]) == binary.LittleEndian.Uint64(src[si+ml:]) {
+				ml += 8
+			}
+			for ml < sn-si && src[next+ml] == src[si+ml] {
+				ml++
+			}
+			if ml+1 < minMatch || ml <= mLen {
+				// Match too small (<minMath) or smaller than the current match.
+				continue
+			}
+			// Found a longer match, keep its position and length.
+			mLen = ml
+			offset = si - next
+			// Try another previous position with the same hash.
+			try--
+		}
+		chainTable[si&winMask] = hashTable[h]
+		hashTable[h] = si
+
+		// No match found.
+		if mLen == 0 {
+			si++
+			continue
+		}
+
+		// Match found.
+		// Update hash/chain tables with overlapping bytes:
+		// si already hashed, add everything from si+1 up to the match length.
+		winStart := si + 1
+		if ws := si + mLen - winSize; ws > winStart {
+			winStart = ws
+		}
+		for si, ml := winStart, si+mLen; si < ml; {
+			match >>= 8
+			match |= uint32(src[si+3]) << 24
+			h := blockHash(match)
+			chainTable[si&winMask] = hashTable[h]
+			hashTable[h] = si
+			si++
+		}
+
+		lLen := si - anchor
+		si += mLen
+		mLen -= minMatch // Match length does not include minMatch.
+
+		if mLen < 0xF {
+			dst[di] = byte(mLen)
+		} else {
+			dst[di] = 0xF
+		}
+
+		// Encode literals length.
+		if lLen < 0xF {
+			dst[di] |= byte(lLen << 4)
+		} else {
+			dst[di] |= 0xF0
+			di++
+			l := lLen - 0xF
+			for ; l >= 0xFF; l -= 0xFF {
+				dst[di] = 0xFF
+				di++
+			}
+			dst[di] = byte(l)
+		}
+		di++
+
+		// Literals.
+		copy(dst[di:], src[anchor:anchor+lLen])
+		di += lLen
+		anchor = si
+
+		// Encode offset.
+		di += 2
+		dst[di-2], dst[di-1] = byte(offset), byte(offset>>8)
+
+		// Encode match length part 2.
+		if mLen >= 0xF {
+			for mLen -= 0xF; mLen >= 0xFF; mLen -= 0xFF {
+				dst[di] = 0xFF
+				di++
+			}
+			dst[di] = byte(mLen)
+			di++
+		}
+	}
+
+	if anchor == 0 {
+		// Incompressible.
+		return 0, nil
+	}
+
+	// Last literals.
+	lLen := len(src) - anchor
+	if lLen < 0xF {
+		dst[di] = byte(lLen << 4)
+	} else {
+		dst[di] = 0xF0
+		di++
+		lLen -= 0xF
+		for ; lLen >= 0xFF; lLen -= 0xFF {
+			dst[di] = 0xFF
+			di++
+		}
+		dst[di] = byte(lLen)
+	}
+	di++
+
+	// Write the last literals.
+	if di >= anchor {
+		// Incompressible.
+		return 0, nil
+	}
+	di += copy(dst[di:], src[anchor:])
+	return di, nil
+}

vendor/github.com/pierrec/lz4/debug.go

@@ -0,0 +1,23 @@
+// +build lz4debug
+
+package lz4
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+const debugFlag = true
+
+func debug(args ...interface{}) {
+	_, file, line, _ := runtime.Caller(1)
+	file = filepath.Base(file)
+
+	f := fmt.Sprintf("LZ4: %s:%d %s", file, line, args[0])
+	if f[len(f)-1] != '\n' {
+		f += "\n"
+	}
+	fmt.Fprintf(os.Stderr, f, args[1:]...)
+}

vendor/github.com/pierrec/lz4/debug_stub.go

@@ -0,0 +1,7 @@
+// +build !lz4debug
+
+package lz4
+
+const debugFlag = false
+
+func debug(args ...interface{}) {}

vendor/github.com/pierrec/lz4/internal/xxh32/xxh32zero.go

@@ -0,0 +1,222 @@
+// Package xxh32 implements the very fast XXH hashing algorithm (32 bits version).
+// (https://github.com/Cyan4973/XXH/)
+package xxh32
+
+import (
+	"encoding/binary"
+)
+
+const (
+	prime32_1 uint32 = 2654435761
+	prime32_2 uint32 = 2246822519
+	prime32_3 uint32 = 3266489917
+	prime32_4 uint32 = 668265263
+	prime32_5 uint32 = 374761393
+
+	prime32_1plus2 uint32 = 606290984
+	prime32_minus1 uint32 = 1640531535
+)
+
+// XXHZero represents an xxhash32 object with seed 0.
+type XXHZero struct {
+	v1       uint32
+	v2       uint32
+	v3       uint32
+	v4       uint32
+	totalLen uint64
+	buf      [16]byte
+	bufused  int
+}
+
+// Sum appends the current hash to b and returns the resulting slice.
+// It does not change the underlying hash state.
+func (xxh XXHZero) Sum(b []byte) []byte {
+	h32 := xxh.Sum32()
+	return append(b, byte(h32), byte(h32>>8), byte(h32>>16), byte(h32>>24))
+}
+
+// Reset resets the Hash to its initial state.
+func (xxh *XXHZero) Reset() {
+	xxh.v1 = prime32_1plus2
+	xxh.v2 = prime32_2
+	xxh.v3 = 0
+	xxh.v4 = prime32_minus1
+	xxh.totalLen = 0
+	xxh.bufused = 0
+}
+
+// Size returns the number of bytes returned by Sum().
+func (xxh *XXHZero) Size() int {
+	return 4
+}
+
+// BlockSize gives the minimum number of bytes accepted by Write().
+func (xxh *XXHZero) BlockSize() int {
+	return 1
+}
+
+// Write adds input bytes to the Hash.
+// It never returns an error.
+func (xxh *XXHZero) Write(input []byte) (int, error) {
+	if xxh.totalLen == 0 {
+		xxh.Reset()
+	}
+	n := len(input)
+	m := xxh.bufused
+
+	xxh.totalLen += uint64(n)
+
+	r := len(xxh.buf) - m
+	if n < r {
+		copy(xxh.buf[m:], input)
+		xxh.bufused += len(input)
+		return n, nil
+	}
+
+	p := 0
+	// Causes compiler to work directly from registers instead of stack:
+	v1, v2, v3, v4 := xxh.v1, xxh.v2, xxh.v3, xxh.v4
+	if m > 0 {
+		// some data left from previous update
+		copy(xxh.buf[xxh.bufused:], input[:r])
+		xxh.bufused += len(input) - r
+
+		// fast rotl(13)
+		buf := xxh.buf[:16] // BCE hint.
+		v1 = rol13(v1+binary.LittleEndian.Uint32(buf[:])*prime32_2) * prime32_1
+		v2 = rol13(v2+binary.LittleEndian.Uint32(buf[4:])*prime32_2) * prime32_1
+		v3 = rol13(v3+binary.LittleEndian.Uint32(buf[8:])*prime32_2) * prime32_1
+		v4 = rol13(v4+binary.LittleEndian.Uint32(buf[12:])*prime32_2) * prime32_1
+		p = r
+		xxh.bufused = 0
+	}
+
+	for n := n - 16; p <= n; p += 16 {
+		sub := input[p:][:16] //BCE hint for compiler
+		v1 = rol13(v1+binary.LittleEndian.Uint32(sub[:])*prime32_2) * prime32_1
+		v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime32_2) * prime32_1
+		v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime32_2) * prime32_1
+		v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime32_2) * prime32_1
+	}
+	xxh.v1, xxh.v2, xxh.v3, xxh.v4 = v1, v2, v3, v4
+
+	copy(xxh.buf[xxh.bufused:], input[p:])
+	xxh.bufused += len(input) - p
+
+	return n, nil
+}
+
+// Sum32 returns the 32 bits Hash value.
+func (xxh *XXHZero) Sum32() uint32 {
+	h32 := uint32(xxh.totalLen)
+	if h32 >= 16 {
+		h32 += rol1(xxh.v1) + rol7(xxh.v2) + rol12(xxh.v3) + rol18(xxh.v4)
+	} else {
+		h32 += prime32_5
+	}
+
+	p := 0
+	n := xxh.bufused
+	buf := xxh.buf
+	for n := n - 4; p <= n; p += 4 {
+		h32 += binary.LittleEndian.Uint32(buf[p:p+4]) * prime32_3
+		h32 = rol17(h32) * prime32_4
+	}
+	for ; p < n; p++ {
+		h32 += uint32(buf[p]) * prime32_5
+		h32 = rol11(h32) * prime32_1
+	}
+
+	h32 ^= h32 >> 15
+	h32 *= prime32_2
+	h32 ^= h32 >> 13
+	h32 *= prime32_3
+	h32 ^= h32 >> 16
+
+	return h32
+}
+
+// ChecksumZero returns the 32bits Hash value.
+func ChecksumZero(input []byte) uint32 {
+	n := len(input)
+	h32 := uint32(n)
+
+	if n < 16 {
+		h32 += prime32_5
+	} else {
+		v1 := prime32_1plus2
+		v2 := prime32_2
+		v3 := uint32(0)
+		v4 := prime32_minus1
+		p := 0
+		for n := n - 16; p <= n; p += 16 {
+			sub := input[p:][:16] //BCE hint for compiler
+			v1 = rol13(v1+binary.LittleEndian.Uint32(sub[:])*prime32_2) * prime32_1
+			v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime32_2) * prime32_1
+			v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime32_2) * prime32_1
+			v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime32_2) * prime32_1
+		}
+		input = input[p:]
+		n -= p
+		h32 += rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
+	}
+
+	p := 0
+	for n := n - 4; p <= n; p += 4 {
+		h32 += binary.LittleEndian.Uint32(input[p:p+4]) * prime32_3
+		h32 = rol17(h32) * prime32_4
+	}
+	for p < n {
+		h32 += uint32(input[p]) * prime32_5
+		h32 = rol11(h32) * prime32_1
+		p++
+	}
+
+	h32 ^= h32 >> 15
+	h32 *= prime32_2
+	h32 ^= h32 >> 13
+	h32 *= prime32_3
+	h32 ^= h32 >> 16
+
+	return h32
+}
+
+// Uint32Zero hashes x with seed 0.
+func Uint32Zero(x uint32) uint32 {
+	h := prime32_5 + 4 + x*prime32_3
+	h = rol17(h) * prime32_4
+	h ^= h >> 15
+	h *= prime32_2
+	h ^= h >> 13
+	h *= prime32_3
+	h ^= h >> 16
+	return h
+}
+
+func rol1(u uint32) uint32 {
+	return u<<1 | u>>31
+}
+
+func rol7(u uint32) uint32 {
+	return u<<7 | u>>25
+}
+
+func rol11(u uint32) uint32 {
+	return u<<11 | u>>21
+}
+
+func rol12(u uint32) uint32 {
+	return u<<12 | u>>20
+}
+
+func rol13(u uint32) uint32 {
+	return u<<13 | u>>19
+}
+
+func rol17(u uint32) uint32 {
+	return u<<17 | u>>15
+}
+
+func rol18(u uint32) uint32 {
+	return u<<18 | u>>14
+}

vendor/github.com/pierrec/lz4/lz4.go

@@ -0,0 +1,68 @@
+// Package lz4 implements reading and writing lz4 compressed data (a frame),
+// as specified in http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html.
+//
+// Although the block level compression and decompression functions are exposed and are fully compatible
+// with the lz4 block format definition, they are low level and should not be used directly.
+// For a complete description of an lz4 compressed block, see:
+// http://fastcompression.blogspot.fr/2011/05/lz4-explained.html
+//
+// See https://github.com/Cyan4973/lz4 for the reference C implementation.
+//
+package lz4
+
+const (
+	// Extension is the LZ4 frame file name extension
+	Extension = ".lz4"
+	// Version is the LZ4 frame format version
+	Version = 1
+
+	frameMagic     uint32 = 0x184D2204
+	frameSkipMagic uint32 = 0x184D2A50
+
+	// The following constants are used to setup the compression algorithm.
+	minMatch            = 4  // the minimum size of the match sequence size (4 bytes)
+	winSizeLog          = 16 // LZ4 64Kb window size limit
+	winSize             = 1 << winSizeLog
+	winMask             = winSize - 1 // 64Kb window of previous data for dependent blocks
+	compressedBlockFlag = 1 << 31
+	compressedBlockMask = compressedBlockFlag - 1
+
+	// hashLog determines the size of the hash table used to quickly find a previous match position.
+	// Its value influences the compression speed and memory usage, the lower the faster,
+	// but at the expense of the compression ratio.
+	// 16 seems to be the best compromise.
+	hashLog       = 16
+	hashTableSize = 1 << hashLog
+	hashShift     = uint((minMatch * 8) - hashLog)
+
+	mfLimit      = 8 + minMatch // The last match cannot start within the last 12 bytes.
+	skipStrength = 6            // variable step for fast scan
+)
+
+// map the block max size id with its value in bytes: 64Kb, 256Kb, 1Mb and 4Mb.
+var (
+	bsMapID    = map[byte]int{4: 64 << 10, 5: 256 << 10, 6: 1 << 20, 7: 4 << 20}
+	bsMapValue = make(map[int]byte, len(bsMapID))
+)
+
+// Reversed.
+func init() {
+	for i, v := range bsMapID {
+		bsMapValue[v] = i
+	}
+}
+
+// Header describes the various flags that can be set on a Writer or obtained from a Reader.
+// The default values match those of the LZ4 frame format definition
+// (http://fastcompression.blogspot.com/2013/04/lz4-streaming-format-final.html).
+//
+// NB. in a Reader, in case of concatenated frames, the Header values may change between Read() calls.
+// It is the caller responsibility to check them if necessary.
+type Header struct {
+	BlockChecksum    bool   // Compressed blocks checksum flag.
+	NoChecksum       bool   // Frame checksum flag.
+	BlockMaxSize     int    // Size of the uncompressed data block (one of [64KB, 256KB, 1MB, 4MB]). Default=4MB.
+	Size             uint64 // Frame total size. It is _not_ computed by the Writer.
+	CompressionLevel int    // Compression level (higher is better, use 0 for fastest compression).
+	done             bool   // Header processed flag (Read or Write and checked).
+}

vendor/github.com/pierrec/lz4/lz4_go1.10.go

@@ -0,0 +1,29 @@
+//+build go1.10
+
+package lz4
+
+import (
+	"fmt"
+	"strings"
+)
+
+func (h Header) String() string {
+	var s strings.Builder
+
+	s.WriteString(fmt.Sprintf("%T{", h))
+	if h.BlockChecksum {
+		s.WriteString("BlockChecksum: true ")
+	}
+	if h.NoChecksum {
+		s.WriteString("NoChecksum: true ")
+	}
+	if bs := h.BlockMaxSize; bs != 0 && bs != 4<<20 {
+		s.WriteString(fmt.Sprintf("BlockMaxSize: %d ", bs))
+	}
+	if l := h.CompressionLevel; l != 0 {
+		s.WriteString(fmt.Sprintf("CompressionLevel: %d ", l))
+	}
+	s.WriteByte('}')
+
+	return s.String()
+}

vendor/github.com/pierrec/lz4/lz4_notgo1.10.go

@@ -0,0 +1,29 @@
+//+build !go1.10
+
+package lz4
+
+import (
+	"bytes"
+	"fmt"
+)
+
+func (h Header) String() string {
+	var s bytes.Buffer
+
+	s.WriteString(fmt.Sprintf("%T{", h))
+	if h.BlockChecksum {
+		s.WriteString("BlockChecksum: true ")
+	}
+	if h.NoChecksum {
+		s.WriteString("NoChecksum: true ")
+	}
+	if bs := h.BlockMaxSize; bs != 0 && bs != 4<<20 {
+		s.WriteString(fmt.Sprintf("BlockMaxSize: %d ", bs))
+	}
+	if l := h.CompressionLevel; l != 0 {
+		s.WriteString(fmt.Sprintf("CompressionLevel: %d ", l))
+	}
+	s.WriteByte('}')
+
+	return s.String()
+}

vendor/github.com/pierrec/lz4/reader.go

@@ -0,0 +1,295 @@
+package lz4
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"io/ioutil"
+
+	"github.com/pierrec/lz4/internal/xxh32"
+)
+
+// Reader implements the LZ4 frame decoder.
+// The Header is set after the first call to Read().
+// The Header may change between Read() calls in case of concatenated frames.
+type Reader struct {
+	Header
+
+	buf      [8]byte       // Scrap buffer.
+	pos      int64         // Current position in src.
+	src      io.Reader     // Source.
+	zdata    []byte        // Compressed data.
+	data     []byte        // Uncompressed data.
+	idx      int           // Index of unread bytes into data.
+	checksum xxh32.XXHZero // Frame hash.
+}
+
+// NewReader returns a new LZ4 frame decoder.
+// No access to the underlying io.Reader is performed.
+func NewReader(src io.Reader) *Reader {
+	r := &Reader{src: src}
+	return r
+}
+
+// readHeader checks the frame magic number and parses the frame descriptoz.
+// Skippable frames are supported even as a first frame although the LZ4
+// specifications recommends skippable frames not to be used as first frames.
+func (z *Reader) readHeader(first bool) error {
+	defer z.checksum.Reset()
+
+	buf := z.buf[:]
+	for {
+		magic, err := z.readUint32()
+		if err != nil {
+			z.pos += 4
+			if !first && err == io.ErrUnexpectedEOF {
+				return io.EOF
+			}
+			return err
+		}
+		if magic == frameMagic {
+			break
+		}
+		if magic>>8 != frameSkipMagic>>8 {
+			return ErrInvalid
+		}
+		skipSize, err := z.readUint32()
+		if err != nil {
+			return err
+		}
+		z.pos += 4
+		m, err := io.CopyN(ioutil.Discard, z.src, int64(skipSize))
+		if err != nil {
+			return err
+		}
+		z.pos += m
+	}
+
+	// Header.
+	if _, err := io.ReadFull(z.src, buf[:2]); err != nil {
+		return err
+	}
+	z.pos += 8
+
+	b := buf[0]
+	if v := b >> 6; v != Version {
+		return fmt.Errorf("lz4: invalid version: got %d; expected %d", v, Version)
+	}
+	if b>>5&1 == 0 {
+		return fmt.Errorf("lz4: block dependency not supported")
+	}
+	z.BlockChecksum = b>>4&1 > 0
+	frameSize := b>>3&1 > 0
+	z.NoChecksum = b>>2&1 == 0
+
+	bmsID := buf[1] >> 4 & 0x7
+	bSize, ok := bsMapID[bmsID]
+	if !ok {
+		return fmt.Errorf("lz4: invalid block max size ID: %d", bmsID)
+	}
+	z.BlockMaxSize = bSize
+
+	// Allocate the compressed/uncompressed buffers.
+	// The compressed buffer cannot exceed the uncompressed one.
+	if n := 2 * bSize; cap(z.zdata) < n {
+		z.zdata = make([]byte, n, n)
+	}
+	if debugFlag {
+		debug("header block max size id=%d size=%d", bmsID, bSize)
+	}
+	z.zdata = z.zdata[:bSize]
+	z.data = z.zdata[:cap(z.zdata)][bSize:]
+	z.idx = len(z.data)
+
+	z.checksum.Write(buf[0:2])
+
+	if frameSize {
+		buf := buf[:8]
+		if _, err := io.ReadFull(z.src, buf); err != nil {
+			return err
+		}
+		z.Size = binary.LittleEndian.Uint64(buf)
+		z.pos += 8
+		z.checksum.Write(buf)
+	}
+
+	// Header checksum.
+	if _, err := io.ReadFull(z.src, buf[:1]); err != nil {
+		return err
+	}
+	z.pos++
+	if h := byte(z.checksum.Sum32() >> 8 & 0xFF); h != buf[0] {
+		return fmt.Errorf("lz4: invalid header checksum: got %x; expected %x", buf[0], h)
+	}
+
+	z.Header.done = true
+	if debugFlag {
+		debug("header read: %v", z.Header)
+	}
+
+	return nil
+}
+
+// Read decompresses data from the underlying source into the supplied buffer.
+//
+// Since there can be multiple streams concatenated, Header values may
+// change between calls to Read(). If that is the case, no data is actually read from
+// the underlying io.Reader, to allow for potential input buffer resizing.
+func (z *Reader) Read(buf []byte) (int, error) {
+	if debugFlag {
+		debug("Read buf len=%d", len(buf))
+	}
+	if !z.Header.done {
+		if err := z.readHeader(true); err != nil {
+			return 0, err
+		}
+		if debugFlag {
+			debug("header read OK compressed buffer %d / %d uncompressed buffer %d : %d index=%d",
+				len(z.zdata), cap(z.zdata), len(z.data), cap(z.data), z.idx)
+		}
+	}
+
+	if len(buf) == 0 {
+		return 0, nil
+	}
+
+	if z.idx == len(z.data) {
+		// No data ready for reading, process the next block.
+		if debugFlag {
+			debug("reading block from writer")
+		}
+		// Block length: 0 = end of frame, highest bit set: uncompressed.
+		bLen, err := z.readUint32()
+		if err != nil {
+			return 0, err
+		}
+		z.pos += 4
+
+		if bLen == 0 {
+			// End of frame reached.
+			if !z.NoChecksum {
+				// Validate the frame checksum.
+				checksum, err := z.readUint32()
+				if err != nil {
+					return 0, err
+				}
+				if debugFlag {
+					debug("frame checksum got=%x / want=%x", z.checksum.Sum32(), checksum)
+				}
+				z.pos += 4
+				if h := z.checksum.Sum32(); checksum != h {
+					return 0, fmt.Errorf("lz4: invalid frame checksum: got %x; expected %x", h, checksum)
+				}
+			}
+
+			// Get ready for the next concatenated frame and keep the position.
+			pos := z.pos
+			z.Reset(z.src)
+			z.pos = pos
+
+			// Since multiple frames can be concatenated, check for more.
+			return 0, z.readHeader(false)
+		}
+
+		if debugFlag {
+			debug("raw block size %d", bLen)
+		}
+		if bLen&compressedBlockFlag > 0 {
+			// Uncompressed block.
+			bLen &= compressedBlockMask
+			if debugFlag {
+				debug("uncompressed block size %d", bLen)
+			}
+			if int(bLen) > cap(z.data) {
+				return 0, fmt.Errorf("lz4: invalid block size: %d", bLen)
+			}
+			z.data = z.data[:bLen]
+			if _, err := io.ReadFull(z.src, z.data); err != nil {
+				return 0, err
+			}
+			z.pos += int64(bLen)
+
+			if z.BlockChecksum {
+				checksum, err := z.readUint32()
+				if err != nil {
+					return 0, err
+				}
+				z.pos += 4
+
+				if h := xxh32.ChecksumZero(z.data); h != checksum {
+					return 0, fmt.Errorf("lz4: invalid block checksum: got %x; expected %x", h, checksum)
+				}
+			}
+
+		} else {
+			// Compressed block.
+			if debugFlag {
+				debug("compressed block size %d", bLen)
+			}
+			if int(bLen) > cap(z.data) {
+				return 0, fmt.Errorf("lz4: invalid block size: %d", bLen)
+			}
+			zdata := z.zdata[:bLen]
+			if _, err := io.ReadFull(z.src, zdata); err != nil {
+				return 0, err
+			}
+			z.pos += int64(bLen)
+
+			if z.BlockChecksum {
+				checksum, err := z.readUint32()
+				if err != nil {
+					return 0, err
+				}
+				z.pos += 4
+
+				if h := xxh32.ChecksumZero(zdata); h != checksum {
+					return 0, fmt.Errorf("lz4: invalid block checksum: got %x; expected %x", h, checksum)
+				}
+			}
+
+			n, err := UncompressBlock(zdata, z.data)
+			if err != nil {
+				return 0, err
+			}
+			z.data = z.data[:n]
+		}
+
+		if !z.NoChecksum {
+			z.checksum.Write(z.data)
+			if debugFlag {
+				debug("current frame checksum %x", z.checksum.Sum32())
+			}
+		}
+		z.idx = 0
+	}
+
+	n := copy(buf, z.data[z.idx:])
+	z.idx += n
+	if debugFlag {
+		debug("copied %d bytes to input", n)
+	}
+
+	return n, nil
+}
+
+// Reset discards the Reader's state and makes it equivalent to the
+// result of its original state from NewReader, but reading from r instead.
+// This permits reusing a Reader rather than allocating a new one.
+func (z *Reader) Reset(r io.Reader) {
+	z.Header = Header{}
+	z.pos = 0
+	z.src = r
+	z.zdata = z.zdata[:0]
+	z.data = z.data[:0]
+	z.idx = 0
+	z.checksum.Reset()
+}
+
+// readUint32 reads an uint32 into the supplied buffer.
+// The idea is to make use of the already allocated buffers avoiding additional allocations.
+func (z *Reader) readUint32() (uint32, error) {
+	buf := z.buf[:4]
+	_, err := io.ReadFull(z.src, buf)
+	x := binary.LittleEndian.Uint32(buf)
+	return x, err
+}

vendor/github.com/pierrec/lz4/writer.go

@@ -0,0 +1,267 @@
+package lz4
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+
+	"github.com/pierrec/lz4/internal/xxh32"
+)
+
+// Writer implements the LZ4 frame encoder.
+type Writer struct {
+	Header
+
+	buf       [19]byte      // magic number(4) + header(flags(2)+[Size(8)+DictID(4)]+checksum(1)) does not exceed 19 bytes
+	dst       io.Writer     // Destination.
+	checksum  xxh32.XXHZero // Frame checksum.
+	zdata     []byte        // Compressed data.
+	data      []byte        // Data to be compressed.
+	idx       int           // Index into data.
+	hashtable [winSize]int  // Hash table used in CompressBlock().
+}
+
+// NewWriter returns a new LZ4 frame encoder.
+// No access to the underlying io.Writer is performed.
+// The supplied Header is checked at the first Write.
+// It is ok to change it before the first Write but then not until a Reset() is performed.
+func NewWriter(dst io.Writer) *Writer {
+	return &Writer{dst: dst}
+}
+
+// writeHeader builds and writes the header (magic+header) to the underlying io.Writer.
+func (z *Writer) writeHeader() error {
+	// Default to 4Mb if BlockMaxSize is not set.
+	if z.Header.BlockMaxSize == 0 {
+		z.Header.BlockMaxSize = bsMapID[7]
+	}
+	// The only option that needs to be validated.
+	bSize := z.Header.BlockMaxSize
+	bSizeID, ok := bsMapValue[bSize]
+	if !ok {
+		return fmt.Errorf("lz4: invalid block max size: %d", bSize)
+	}
+	// Allocate the compressed/uncompressed buffers.
+	// The compressed buffer cannot exceed the uncompressed one.
+	if n := 2 * bSize; cap(z.zdata) < n {
+		z.zdata = make([]byte, n, n)
+	}
+	z.zdata = z.zdata[:bSize]
+	z.data = z.zdata[:cap(z.zdata)][bSize:]
+	z.idx = 0
+
+	// Size is optional.
+	buf := z.buf[:]
+
+	// Set the fixed size data: magic number, block max size and flags.
+	binary.LittleEndian.PutUint32(buf[0:], frameMagic)
+	flg := byte(Version << 6)
+	flg |= 1 << 5 // No block dependency.
+	if z.Header.BlockChecksum {
+		flg |= 1 << 4
+	}
+	if z.Header.Size > 0 {
+		flg |= 1 << 3
+	}
+	if !z.Header.NoChecksum {
+		flg |= 1 << 2
+	}
+	buf[4] = flg
+	buf[5] = bSizeID << 4
+
+	// Current buffer size: magic(4) + flags(1) + block max size (1).
+	n := 6
+	// Optional items.
+	if z.Header.Size > 0 {
+		binary.LittleEndian.PutUint64(buf[n:], z.Header.Size)
+		n += 8
+	}
+
+	// The header checksum includes the flags, block max size and optional Size.
+	buf[n] = byte(xxh32.ChecksumZero(buf[4:n]) >> 8 & 0xFF)
+	z.checksum.Reset()
+
+	// Header ready, write it out.
+	if _, err := z.dst.Write(buf[0 : n+1]); err != nil {
+		return err
+	}
+	z.Header.done = true
+	if debugFlag {
+		debug("wrote header %v", z.Header)
+	}
+
+	return nil
+}
+
+// Write compresses data from the supplied buffer into the underlying io.Writer.
+// Write does not return until the data has been written.
+func (z *Writer) Write(buf []byte) (int, error) {
+	if !z.Header.done {
+		if err := z.writeHeader(); err != nil {
+			return 0, err
+		}
+	}
+	if debugFlag {
+		debug("input buffer len=%d index=%d", len(buf), z.idx)
+	}
+
+	zn := len(z.data)
+	var n int
+	for len(buf) > 0 {
+		if z.idx == 0 && len(buf) >= zn {
+			// Avoid a copy as there is enough data for a block.
+			if err := z.compressBlock(buf[:zn]); err != nil {
+				return n, err
+			}
+			n += zn
+			buf = buf[zn:]
+			continue
+		}
+		// Accumulate the data to be compressed.
+		m := copy(z.data[z.idx:], buf)
+		n += m
+		z.idx += m
+		buf = buf[m:]
+		if debugFlag {
+			debug("%d bytes copied to buf, current index %d", n, z.idx)
+		}
+
+		if z.idx < len(z.data) {
+			// Buffer not filled.
+			if debugFlag {
+				debug("need more data for compression")
+			}
+			return n, nil
+		}
+
+		// Buffer full.
+		if err := z.compressBlock(z.data); err != nil {
+			return n, err
+		}
+		z.idx = 0
+	}
+
+	return n, nil
+}
+
+// compressBlock compresses a block.
+func (z *Writer) compressBlock(data []byte) error {
+	if !z.NoChecksum {
+		z.checksum.Write(data)
+	}
+
+	// The compressed block size cannot exceed the input's.
+	var zn int
+	var err error
+
+	if level := z.Header.CompressionLevel; level != 0 {
+		zn, err = CompressBlockHC(data, z.zdata, level)
+	} else {
+		zn, err = CompressBlock(data, z.zdata, z.hashtable[:])
+	}
+
+	var zdata []byte
+	var bLen uint32
+	if debugFlag {
+		debug("block compression %d => %d", len(data), zn)
+	}
+	if err == nil && zn > 0 && zn < len(data) {
+		// Compressible and compressed size smaller than uncompressed: ok!
+		bLen = uint32(zn)
+		zdata = z.zdata[:zn]
+	} else {
+		// Uncompressed block.
+		bLen = uint32(len(data)) | compressedBlockFlag
+		zdata = data
+	}
+	if debugFlag {
+		debug("block compression to be written len=%d data len=%d", bLen, len(zdata))
+	}
+
+	// Write the block.
+	if err := z.writeUint32(bLen); err != nil {
+		return err
+	}
+	if _, err := z.dst.Write(zdata); err != nil {
+		return err
+	}
+
+	if z.BlockChecksum {
+		checksum := xxh32.ChecksumZero(zdata)
+		if debugFlag {
+			debug("block checksum %x", checksum)
+		}
+		if err := z.writeUint32(checksum); err != nil {
+			return err
+		}
+	}
+	if debugFlag {
+		debug("current frame checksum %x", z.checksum.Sum32())
+	}
+
+	return nil
+}
+
+// Flush flushes any pending compressed data to the underlying writer.
+// Flush does not return until the data has been written.
+// If the underlying writer returns an error, Flush returns that error.
+func (z *Writer) Flush() error {
+	if debugFlag {
+		debug("flush with index %d", z.idx)
+	}
+	if z.idx == 0 {
+		return nil
+	}
+
+	return z.compressBlock(z.data[:z.idx])
+}
+
+// Close closes the Writer, flushing any unwritten data to the underlying io.Writer, but does not close the underlying io.Writer.
+func (z *Writer) Close() error {
+	if !z.Header.done {
+		if err := z.writeHeader(); err != nil {
+			return err
+		}
+	}
+
+	if err := z.Flush(); err != nil {
+		return err
+	}
+
+	if debugFlag {
+		debug("writing last empty block")
+	}
+	if err := z.writeUint32(0); err != nil {
+		return err
+	}
+	if !z.NoChecksum {
+		checksum := z.checksum.Sum32()
+		if debugFlag {
+			debug("stream checksum %x", checksum)
+		}
+		if err := z.writeUint32(checksum); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Reset clears the state of the Writer z such that it is equivalent to its
+// initial state from NewWriter, but instead writing to w.
+// No access to the underlying io.Writer is performed.
+func (z *Writer) Reset(w io.Writer) {
+	z.Header = Header{}
+	z.dst = w
+	z.checksum.Reset()
+	z.zdata = z.zdata[:0]
+	z.data = z.data[:0]
+	z.idx = 0
+}
+
+// writeUint32 writes a uint32 to the underlying writer.
+func (z *Writer) writeUint32(x uint32) error {
+	buf := z.buf[:4]
+	binary.LittleEndian.PutUint32(buf, x)
+	_, err := z.dst.Write(buf)
+	return err
+}

vendor/github.com/pkg/errors/.gitignore

@@ -0,0 +1,24 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/pkg/errors/.travis.yml

@@ -0,0 +1,11 @@
+language: go
+go_import_path: github.com/pkg/errors
+go:
+  - 1.4.3
+  - 1.5.4
+  - 1.6.2
+  - 1.7.1
+  - tip
+
+script:
+  - go test -v ./...

vendor/github.com/pkg/errors/LICENSE

@@ -0,0 +1,23 @@
+Copyright (c) 2015, Dave Cheney <dave@cheney.net>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/pkg/errors/README.md

@@ -0,0 +1,52 @@
+# errors [![Travis-CI](https://travis-ci.org/pkg/errors.svg)](https://travis-ci.org/pkg/errors) [![AppVeyor](https://ci.appveyor.com/api/projects/status/b98mptawhudj53ep/branch/master?svg=true)](https://ci.appveyor.com/project/davecheney/errors/branch/master) [![GoDoc](https://godoc.org/github.com/pkg/errors?status.svg)](http://godoc.org/github.com/pkg/errors) [![Report card](https://goreportcard.com/badge/github.com/pkg/errors)](https://goreportcard.com/report/github.com/pkg/errors)
+
+Package errors provides simple error handling primitives.
+
+`go get github.com/pkg/errors`
+
+The traditional error handling idiom in Go is roughly akin to
+```go
+if err != nil {
+        return err
+}
+```
+which applied recursively up the call stack results in error reports without context or debugging information. The errors package allows programmers to add context to the failure path in their code in a way that does not destroy the original value of the error.
+
+## Adding context to an error
+
+The errors.Wrap function returns a new error that adds context to the original error. For example
+```go
+_, err := ioutil.ReadAll(r)
+if err != nil {
+        return errors.Wrap(err, "read failed")
+}
+```
+## Retrieving the cause of an error
+
+Using `errors.Wrap` constructs a stack of errors, adding context to the preceding error. Depending on the nature of the error it may be necessary to reverse the operation of errors.Wrap to retrieve the original error for inspection. Any error value which implements this interface can be inspected by `errors.Cause`.
+```go
+type causer interface {
+        Cause() error
+}
+```
+`errors.Cause` will recursively retrieve the topmost error which does not implement `causer`, which is assumed to be the original cause. For example:
+```go
+switch err := errors.Cause(err).(type) {
+case *MyError:
+        // handle specifically
+default:
+        // unknown error
+}
+```
+
+[Read the package documentation for more information](https://godoc.org/github.com/pkg/errors).
+
+## Contributing
+
+We welcome pull requests, bug fixes and issue reports. With that said, the bar for adding new symbols to this package is intentionally set high.
+
+Before proposing a change, please discuss your change by raising an issue.
+
+## Licence
+
+BSD-2-Clause