migrate boot.tar to initrd-v2

Dockerfile

@@ -1,5 +1,5 @@
 # ------------------------------------------------------------------------
-from mcluseau/golang-builder:1.18.0 as build
+from mcluseau/golang-builder:1.18.2 as build
 
 # ------------------------------------------------------------------------
 from debian:stretch

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

@@ -2,11 +2,11 @@ package main
 
 import (
 	"archive/tar"
-	"fmt"
+    "bytes"
 	"io"
+    "io/ioutil"
 	"log"
 	"os"
-	"path/filepath"
 )
 
 func rmTempFile(f *os.File) {
@@ -21,7 +21,7 @@ func buildBootTar(out io.Writer, ctx *renderContext) (err error) {
 	defer arch.Close()
 
 	archAdd := func(path string, ba []byte) (err error) {
-		err = arch.WriteHeader(&tar.Header{Name: path, Size: int64(len(ba))})
+		err = arch.WriteHeader(&tar.Header{Name: path, Mode: 0640, Size: int64(len(ba))})
 		if err != nil {
 			return
 		}
@@ -29,70 +29,34 @@ func buildBootTar(out io.Writer, ctx *renderContext) (err error) {
 		return
 	}
 
-	// config
-	cfgBytes, cfg, err := ctx.Config()
+	// kernel
+	kernelPath, err := ctx.distFetch("kernels", ctx.Host.Kernel)
 	if err != nil {
-		return err
+		return
 	}
 
-	archAdd("config.yaml", cfgBytes)
-
-	// add "current" elements
-	type distCopy struct {
-		Src []string
-		Dst string
-	}
-
-	// kernel and initrd
-	copies := []distCopy{
-		{Src: []string{"kernels", ctx.Host.Kernel}, Dst: "current/vmlinuz"},
-		{Src: []string{"initrd", ctx.Host.Initrd}, Dst: "current/initrd"},
-	}
-
-	// layers
-	for _, layer := range cfg.Layers {
-		layerVersion := ctx.Host.Versions[layer]
-		if layerVersion == "" {
-			return fmt.Errorf("layer %q not mapped to a version", layer)
-		}
-
-		copies = append(copies,
-			distCopy{
-				Src: []string{"layers", layer, layerVersion},
-				Dst: filepath.Join("current", "layers", layer+".fs"),
-			})
-	}
-
-	for _, copy := range copies {
-		outPath, err := ctx.distFetch(copy.Src...)
+	kernelBytes, err := ioutil.ReadFile(kernelPath)
 	if err != nil {
-			return err
+		return
 	}
 
-		f, err := os.Open(outPath)
+	err = archAdd("current/vmlinuz", kernelBytes)
     if err != nil {
-			return err
+        return
     }
 
-		defer f.Close()
-
-		stat, err := f.Stat()
+	// initrd
+	initrd := new(bytes.Buffer)
+	err = buildInitrdV2(initrd, ctx)
 	if err != nil {
-			return err
+		return
 	}
 
-		if err = arch.WriteHeader(&tar.Header{
-			Name: copy.Dst,
-			Size: stat.Size(),
-		}); err != nil {
-			return err
-		}
-
-		_, err = io.Copy(arch, f)
+	err = archAdd("current/initrd", initrd.Bytes())
 	if err != nil {
-			return err
-		}
+		return
 	}
 
+	// done
 	return nil
 }