// extractKernelAssets extracts kernel/initrd/dtb data from the given
// Snap to a versionized bootloader directory so that the bootloader
// can use it.
func extractKernelAssets(s *snap.Info, snapf snap.File, flags InstallFlags, inter progress.Meter) error {
if s.Type != snap.TypeKernel {
return fmt.Errorf("can not extract kernel assets from snap type %q", s.Type)
}
bootloader, err := findBootloader()
if err != nil {
return fmt.Errorf("can not extract kernel assets: %s", err)
}
// check if we are on a "grub" system. if so, no need to unpack
// the kernel
if oem, err := getGadget(); err == nil {
if oem.Legacy.Gadget.Hardware.Bootloader == "grub" {
return nil
}
}
// now do the kernel specific bits
blobName := filepath.Base(s.MountFile())
dstDir := filepath.Join(bootloader.Dir(), blobName)
if err := os.MkdirAll(dstDir, 0755); err != nil {
return err
}
dir, err := os.Open(dstDir)
if err != nil {
return err
}
defer dir.Close()
for _, src := range []string{s.Legacy.Kernel, s.Legacy.Initrd} {
if src == "" {
continue
}
if err := snapf.Unpack(src, dstDir); err != nil {
return err
}
src = filepath.Join(dstDir, src)
dst := filepath.Join(dstDir, dropVersionSuffix(src))
if err := os.Rename(src, dst); err != nil {
return err
}
if err := dir.Sync(); err != nil {
return err
}
}
if s.Legacy.Dtbs != "" {
src := filepath.Join(s.Legacy.Dtbs, "*")
dst := dstDir
if err := snapf.Unpack(src, dst); err != nil {
return err
}
}
return dir.Sync()
}
