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output: Add support for CPU ucode to the kernel+initrd format

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This prepends 'ucode.cpio' to the initrd if present. Padding
should not be necessary as the ucode.cpio should be padded
to the right size.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This commit is contained in:
Rolf Neugebauer 2018-01-15 16:03:55 +00:00
parent 1d24454438
commit 5d5a13526b
1 changed files with 23 additions and 10 deletions
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33
src/moby/output.go
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@ -27,12 +27,11 @@ const (
var outFuns = map[string]func(string, io.Reader, int) error{
"kernel+initrd": func(base string, image io.Reader, size int) error {
kernel, initrd, cmdline, _, err := tarToInitrd(image)
kernel, initrd, cmdline, ucode, err := tarToInitrd(image)
if err != nil {
return fmt.Errorf("Error converting to initrd: %v", err)
}
// TODO: Handle ucode
err = outputKernelInitrd(base, kernel, initrd, cmdline)
err = outputKernelInitrd(base, kernel, initrd, cmdline, ucode)
if err != nil {
return fmt.Errorf("Error writing kernel+initrd output: %v", err)
}
@ -317,15 +316,29 @@ func outputRPi3(image, filename string, filesystem io.Reader) error {
return dockerRun(filesystem, output, true, image)
}
func outputKernelInitrd(base string, kernel []byte, initrd []byte, cmdline string) error {
func outputKernelInitrd(base string, kernel []byte, initrd []byte, cmdline string, ucode []byte) error {
log.Debugf("output kernel/initrd: %s %s", base, cmdline)
log.Infof(" %s %s %s", base+"-kernel", base+"-initrd.img", base+"-cmdline")
err := ioutil.WriteFile(base+"-initrd.img", initrd, os.FileMode(0644))
if err != nil {
return err
if len(ucode) != 0 {
log.Infof(" %s ucode+%s %s", base+"-kernel", base+"-initrd.img", base+"-cmdline")
if err := ioutil.WriteFile(base+"-initrd.img", ucode, os.FileMode(0644)); err != nil {
return err
}
f, err := os.OpenFile(base+"-initrd.img", os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
return err
}
defer f.Close()
if _, err = f.Write(initrd); err != nil {
return err
}
} else {
log.Infof(" %s %s %s", base+"-kernel", base+"-initrd.img", base+"-cmdline")
if err := ioutil.WriteFile(base+"-initrd.img", initrd, os.FileMode(0644)); err != nil {
return err
}
}
err = ioutil.WriteFile(base+"-kernel", kernel, os.FileMode(0644))
if err != nil {
if err := ioutil.WriteFile(base+"-kernel", kernel, os.FileMode(0644)); err != nil {
return err
}
return ioutil.WriteFile(base+"-cmdline", []byte(cmdline), os.FileMode(0644))