99 lines
1.7 KiB
Go
99 lines
1.7 KiB
Go
package main
|
|
|
|
import (
|
|
"archive/tar"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"os"
|
|
"path/filepath"
|
|
)
|
|
|
|
func rmTempFile(f *os.File) {
|
|
f.Close()
|
|
if err := os.Remove(f.Name()); err != nil {
|
|
log.Print("failed to remove ", f.Name(), ": ", err)
|
|
}
|
|
}
|
|
|
|
func buildBootTar(out io.Writer, ctx *renderContext) (err error) {
|
|
arch := tar.NewWriter(out)
|
|
defer arch.Close()
|
|
|
|
archAdd := func(path string, ba []byte) (err error) {
|
|
err = arch.WriteHeader(&tar.Header{Name: path, Size: int64(len(ba))})
|
|
if err != nil {
|
|
return
|
|
}
|
|
_, err = arch.Write(ba)
|
|
return
|
|
}
|
|
|
|
// config
|
|
cfgBytes, cfg, err := ctx.Config()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
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...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
f, err := os.Open(outPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer f.Close()
|
|
|
|
stat, err := f.Stat()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err = arch.WriteHeader(&tar.Header{
|
|
Name: copy.Dst,
|
|
Size: stat.Size(),
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = io.Copy(arch, f)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|