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Support both kernel and bzImage for now

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Also do not require `tar` to be in container, use the standard
image export code that we already have and find the files we
want.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This commit is contained in:
Justin Cormack 2017-04-28 12:48:04 +01:00
parent 2cd9bead88
commit ef017ac223
1 changed files with 13 additions and 7 deletions
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16
cmd/moby/build.go
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@ -117,18 +117,19 @@ func buildInternal(name string, pull bool, config []byte) {
}
}
// get kernel and initrd tarball from container
// TODO examine contents to see what names they might have
log.Infof("Extract kernel image: %s", m.Kernel.Image)
const (
kernelName = "kernel"
kernelAltName = "bzImage"
ktarName = "kernel.tar"
)
out, err := dockerRun(m.Kernel.Image, "tar", "cf", "-", kernelName, ktarName)
out, err := ImageExtract(m.Kernel.Image, "")
if err != nil {
log.Fatalf("Failed to extract kernel image and tarball: %v", err)
}
buf := bytes.NewBuffer(out)
kernel, ktar, err := untarKernel(buf, kernelName, ktarName)
kernel, ktar, err := untarKernel(buf, kernelName, kernelAltName, ktarName)
if err != nil {
log.Fatalf("Could not extract kernel image and filesystem from tarball. %v", err)
}
@ -218,10 +219,11 @@ func buildInternal(name string, pull bool, config []byte) {
}
}
func untarKernel(buf *bytes.Buffer, kernelName, ktarName string) (*bytes.Buffer, *bytes.Buffer, error) {
func untarKernel(buf *bytes.Buffer, kernelName, kernelAltName, ktarName string) (*bytes.Buffer, *bytes.Buffer, error) {
tr := tar.NewReader(buf)
var kernel, ktar *bytes.Buffer
foundKernel := false
for {
hdr, err := tr.Next()
@ -232,7 +234,11 @@ func untarKernel(buf *bytes.Buffer, kernelName, ktarName string) (*bytes.Buffer,
log.Fatalln(err)
}
switch hdr.Name {
case kernelName:
case kernelName, kernelAltName:
if foundKernel {
return nil, nil, errors.New("found more than one possible kernel image")
}
foundKernel = true
kernel = new(bytes.Buffer)
_, err := io.Copy(kernel, tr)
if err != nil {