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cmd: Add 'kernel+iso' output format

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This output format create a kernel + and straight data ISO.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2018-07-25 11:34:36 +01:00
parent 594ce1251d
commit 69d913c5a7
1 changed files with 63 additions and 0 deletions
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63
src/cmd/linuxkit/moby/output.go
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@ -16,6 +16,7 @@ import (
var (
outputImages = map[string]string{
"iso": "linuxkit/mkimage-iso:4c77e9969773bf0ed6b0eb2230a2c94b5fae47ab",
"iso-bios": "linuxkit/mkimage-iso-bios:65254243f003cf0ac74c64b0a23b543195ddad8a",
"iso-efi": "linuxkit/mkimage-iso-efi:1f5556e56da8e82d52458667ad354b719f314eb2",
"raw-bios": "linuxkit/mkimage-raw-bios:2795f6282bdb8582934d5a0c2f1f859d3073336c",
@ -108,6 +109,13 @@ var outFuns = map[string]func(string, io.Reader, int) error{
}
return nil
},
"kernel+iso": func(base string, image io.Reader, size int) error {
err := outputKernelISO(outputImages["iso"], base, image)
if err != nil {
return fmt.Errorf("Error writing kernel+iso output: %v", err)
}
return nil
},
"aws": func(base string, image io.Reader, size int) error {
filename := base + ".raw"
log.Infof(" %s", filename)
@ -498,3 +506,58 @@ func outputKernelSquashFS(image, base string, filesystem io.Reader) error {
return dockerRun(buf, output, true, image)
}
func outputKernelISO(image, base string, filesystem io.Reader) error {
log.Debugf("output kernel/iso: %s %s", image, base)
log.Infof(" %s.iso", base)
tr := tar.NewReader(filesystem)
buf := new(bytes.Buffer)
rootfs := tar.NewWriter(buf)
for {
var thdr *tar.Header
thdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
thdr.Format = tar.FormatPAX
switch {
case thdr.Name == "boot/kernel":
kernel, err := ioutil.ReadAll(tr)
if err != nil {
return err
}
if err := ioutil.WriteFile(base+"-kernel", kernel, os.FileMode(0644)); err != nil {
return err
}
case thdr.Name == "boot/cmdline":
cmdline, err := ioutil.ReadAll(tr)
if err != nil {
return err
}
if err := ioutil.WriteFile(base+"-cmdline", cmdline, os.FileMode(0644)); err != nil {
return err
}
case strings.HasPrefix(thdr.Name, "boot/"):
// skip the rest of boot/
default:
rootfs.WriteHeader(thdr)
if _, err := io.Copy(rootfs, tr); err != nil {
return err
}
}
}
rootfs.Close()
output, err := os.Create(base + ".iso")
if err != nil {
return err
}
defer output.Close()
return dockerRun(buf, output, true, image)
}