From 46bfd58d8ef9e796aff013ad949d3f552f291ef8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mika=C3=ABl=20Cluseau?= Date: Sat, 14 Nov 2020 22:43:34 +0100 Subject: [PATCH] dynlay --- cmd/dkl/main.go | 2 + go.mod | 3 + go.sum | 26 ++++++ modd.conf | 7 +- pkg/cmd/dynlay/dynlay.go | 190 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 227 insertions(+), 1 deletion(-) create mode 100644 pkg/cmd/dynlay/dynlay.go diff --git a/cmd/dkl/main.go b/cmd/dkl/main.go index 19f6f9c..6a96c3a 100644 --- a/cmd/dkl/main.go +++ b/cmd/dkl/main.go @@ -5,6 +5,7 @@ import ( "github.com/spf13/cobra" + cmddynlay "novit.nc/direktil/inits/pkg/cmd/dynlay" cmdinit "novit.nc/direktil/inits/pkg/cmd/init" ) @@ -12,6 +13,7 @@ func main() { root := &cobra.Command{} root.AddCommand(cmdinit.Command()) + root.AddCommand(cmddynlay.Command()) if err := root.Execute(); err != nil { log.Fatal("error: ", err) diff --git a/go.mod b/go.mod index 7f16e51..62bb1fc 100644 --- a/go.mod +++ b/go.mod @@ -3,13 +3,16 @@ module novit.nc/direktil/inits go 1.15 require ( + github.com/antage/mntent v0.0.0-20141129103236-834970000c6c github.com/fsnotify/fsnotify v1.4.9 github.com/go-ping/ping v0.0.0-20201001214134-671c40f29adc + github.com/paultag/go-loopback v0.0.0-20180807022812-2589a042248e // indirect github.com/spf13/cobra v1.0.0 github.com/spf13/pflag v1.0.5 // indirect github.com/ulikunitz/xz v0.5.8 // indirect golang.org/x/net v0.0.0-20200930145003-4acb6c075d10 // indirect golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect + gonum.org/v1/gonum v0.8.1 // indirect gopkg.in/yaml.v2 v2.3.0 // indirect novit.nc/direktil/pkg v0.0.0-20191211161950-96b0448b84c2 ) diff --git a/go.sum b/go.sum index 2db84ab..84e8a7a 100644 --- a/go.sum +++ b/go.sum @@ -1,8 +1,11 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw= github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/antage/mntent v0.0.0-20141129103236-834970000c6c h1:6g5LfUYqDR1rEL54hKdK7edwAp2R4baYmtDpJgm6+5Q= +github.com/antage/mntent v0.0.0-20141129103236-834970000c6c/go.mod h1:AsQhRqephGS4znB7Z793C63GgcW2I6xUsInepL9EOdE= github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8= github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= @@ -17,11 +20,13 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsr github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ= github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no= +github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k= github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I= github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4= github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ= github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= +github.com/go-kit/kit v0.8.0 h1:Wz+5lgoB0kkuqLEc6NVmwRknTKP6dTGbSqvhZtBI/j0= github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as= github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE= github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk= @@ -30,10 +35,12 @@ github.com/go-ping/ping v0.0.0-20201001214134-671c40f29adc/go.mod h1:35JbSyV/BYq github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4= +github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k= github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg= github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ= github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M= @@ -46,6 +53,7 @@ github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NH github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8= github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo= github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w= +github.com/jung-kurt/gofpdf v1.0.3-0.20190309125859-24315acbbda5/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes= github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q= github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck= github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ= @@ -61,6 +69,8 @@ github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y= github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U= github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U= +github.com/paultag/go-loopback v0.0.0-20180807022812-2589a042248e h1:qoHpC8Xx84+Uqod6i8DjIgxMKXUyiv16rinyly8XT7A= +github.com/paultag/go-loopback v0.0.0-20180807022812-2589a042248e/go.mod h1:a8zVTnQlIjBriq5Q5MOS9xmfBQHGCyrBilmLyKZW9Ls= github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic= github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= @@ -105,6 +115,11 @@ go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q= golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= +golang.org/x/exp v0.0.0-20180321215751-8460e604b9de/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= +golang.org/x/exp v0.0.0-20180807140117-3d87b88a115f/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= +golang.org/x/exp v0.0.0-20190125153040-c74c464bbbf2 h1:y102fOLFqhV41b+4GPiJoa0k/x+pJcEi2/HB1Y5T6fU= +golang.org/x/exp v0.0.0-20190125153040-c74c464bbbf2/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= +golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs= golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE= golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc= golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= @@ -131,14 +146,24 @@ golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA= golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= +golang.org/x/tools v0.0.0-20180525024113-a5b4c53f6e8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= +golang.org/x/tools v0.0.0-20190206041539-40960b6deb8e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= +gonum.org/v1/gonum v0.0.0-20180816165407-929014505bf4/go.mod h1:Y+Yx5eoAFn32cQvJDxZx5Dpnq+c3wtXuadVZAcxbbBo= +gonum.org/v1/gonum v0.8.1 h1:wGtP3yGpc5mCLOLeTeBdjeui9oZSz5De0eOjMLC/QuQ= +gonum.org/v1/gonum v0.8.1/go.mod h1:oe/vMfY3deqTw+1EZJhuvEW2iwGF1bW9wwu7XCu0+v0= +gonum.org/v1/netlib v0.0.0-20190313105609-8cb42192e0e0/go.mod h1:wa6Ws7BG/ESfp6dHfk7C6KdzKA7wR7u/rKwOGE66zvw= +gonum.org/v1/plot v0.0.0-20190515093506-e2840ee46a6b/go.mod h1:Wt8AAjI+ypCyYX3nZBvf6cAIx93T+c/OS2HFAYskSZc= google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM= +google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc= google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc= google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c= +google.golang.org/grpc v1.21.0 h1:G+97AoqBnmZIT91cLG/EkCoK9NSelj64P8bOHHNmGn0= google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM= gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= @@ -156,3 +181,4 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= novit.nc/direktil/pkg v0.0.0-20191211161950-96b0448b84c2 h1:LN3K19gAJ1GamJXkzXAQmjbl8xCV7utqdxTTrM89MMc= novit.nc/direktil/pkg v0.0.0-20191211161950-96b0448b84c2/go.mod h1:zwTVO6U0tXFEaga73megQIBK7yVIKZJVePaIh/UtdfU= +rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4= diff --git a/modd.conf b/modd.conf index e55ea61..767e5c8 100644 --- a/modd.conf +++ b/modd.conf @@ -1,7 +1,12 @@ +modd.conf {} + **/*.go layer/**/* test-vm update-test-data { prep: go test ./... #./pkg/... ./cmd/dkl prep: mkdir -p dist - prep: CGO_ENABLED=0 go build -o dist ./cmd/... + prep: CGO_ENABLED=0 go build -o dist -trimpath ./cmd/... + + prep: rsync -za --stats dist/dkl bw:/usr/local/bin/ + prep: ssh bw dkl dynlay --url-prefix https://dkl.nwrk.info/dist/layers kubernetes v1.19.4_containerd.1.4.1 #prep: ./update-test-data #daemon: ./test-vm 1 diff --git a/pkg/cmd/dynlay/dynlay.go b/pkg/cmd/dynlay/dynlay.go new file mode 100644 index 0000000..6d354f2 --- /dev/null +++ b/pkg/cmd/dynlay/dynlay.go @@ -0,0 +1,190 @@ +package dynlay + +import ( + "fmt" + "io" + "log" + "net/http" + "os" + "os/exec" + "path/filepath" + + "github.com/antage/mntent" + "github.com/spf13/cobra" +) + +var urlPrefix = "https://dkl.novit.nc/dist/layers" + +func Command() (c *cobra.Command) { + c = &cobra.Command{ + Use: "dynlay ", + Short: "set dynamic layer", + Args: cobra.ExactArgs(2), + + Run: run, + } + + c.Flags().StringVar(&urlPrefix, "url-prefix", urlPrefix, "Layer URL prefix") + + return c +} + +func run(_ *cobra.Command, args []string) { + layer, version := args[0], args[1] + + layDir := filepath.Join("/opt/dynlay", layer) + + err := os.MkdirAll(layDir, 0755) + fail(err) + + layPath := filepath.Join(layDir, version) + + // fetch if not exist + _, err = os.Stat(layPath) + if os.IsNotExist(err) { + fetch(layPath, urlPrefix+"/"+layer+"/"+version) + } + + mounted := map[string]bool{} + { + mounts, err := mntent.Parse("/etc/mtab") + fail(err) + for _, mount := range mounts { + mounted[mount.Directory] = true + } + } + + // mount + mountPath := filepath.Join("/run/dynlay", layer, version) + + if !mounted[mountPath] { + err = os.MkdirAll(mountPath, 0755) + fail(err) + + cmd := exec.Command("mount", "-t", "squashfs", layPath, mountPath) + cmd.Stdout = os.Stdout + cmd.Stderr = os.Stderr + err = cmd.Run() + if err != nil { + os.Remove(mountPath) + fail(err) + } + } + + // update links + existing := map[string]bool{} + { + paths, err := linkableFrom(mountPath) + fail(err) + + for _, path := range paths { + existing[path] = true + + fmt.Println("linking", path) + + target := "/" + path + os.Remove(target) + + os.MkdirAll(filepath.Dir(target), 0755) + + err := os.Symlink(filepath.Join(mountPath, path), target) + if err != nil { + log.Print("warning: symlink of ", path, " failed: ", err) + } + } + } + + // remove expired links + basePaths, err := filepath.Glob(filepath.Join(filepath.Dir(mountPath), "*")) + fail(err) + + for _, base := range basePaths { + if base == mountPath { + continue + } + + stat, err := os.Stat(base) + fail(err) + + if !stat.IsDir() { + continue + } + + paths, err := linkableFrom(base) + fail(err) + + for _, path := range paths { + if existing[path] { + continue + } + + _, err := os.Stat("/" + path) + if os.IsNotExist(err) { + continue + } + + fmt.Print("unlinking ", path, " (from ", filepath.Base(base), ")\n") + + err = os.Remove("/" + path) + if err != nil { + log.Print("warning: failed to unlink ", path, ": ", err) + } + } + + if mounted[base] { + cmd := exec.Command("umount", "-l", base) + cmd.Stdout = os.Stdout + cmd.Stderr = os.Stderr + cmd.Run() + } + + os.Remove(base) + } +} + +func linkableFrom(dir string) (paths []string, err error) { + err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error { + if err != nil { + return err + } + + if info.IsDir() { + return nil + } + + path, err = filepath.Rel(dir, path) + paths = append(paths, path) + return nil + }) + return +} + +func fetch(outPath string, url string) { + f, err := os.Create(outPath + ".part") + fail(err) + + defer f.Close() + + log.Print("fetching ", url) + resp, err := http.Get(url) + fail(err) + + if resp.StatusCode != 200 { + log.Fatal("GET failed on ", url, ": ", resp.Status) + } + + _, err = io.Copy(f, resp.Body) + fail(err) + + f.Close() + + os.Rename(outPath+".part", outPath) +} + +func fail(err error) { + if err != nil { + log.SetFlags(log.Flags() | log.Lshortfile) + log.Output(2, err.Error()) + os.Exit(-1) + } +}