// setNextBoot will schedule the given os or kernel snap to be used in
// the next boot
func setNextBoot(s *SnapPart) error {
if s.m.Type != snap.TypeOS && s.m.Type != snap.TypeKernel {
return nil
}
bootloader, err := findBootloader()
if err != nil {
return fmt.Errorf("can not set next boot: %s", err)
}
var bootvar string
switch s.m.Type {
case snap.TypeOS:
bootvar = "snappy_os"
case snap.TypeKernel:
bootvar = "snappy_kernel"
}
blobName := filepath.Base(squashfs.BlobPath(s.basedir))
if err := bootloader.SetBootVar(bootvar, blobName); err != nil {
return err
}
if err := bootloader.SetBootVar("snappy_mode", "try"); err != nil {
return err
}
return nil
}
func (s *SnapPart) remove(inter interacter) (err error) {
if err := s.deactivate(false, inter); err != nil && err != ErrSnapNotActive {
return err
}
// ensure mount unit stops
if err := s.m.removeSquashfsMount(s.basedir, inter); err != nil {
return err
}
err = os.RemoveAll(s.basedir)
if err != nil {
return err
}
// best effort(?)
os.Remove(filepath.Dir(s.basedir))
// remove the snap
if err := os.RemoveAll(squashfs.BlobPath(s.basedir)); err != nil {
return err
}
// remove the kernel assets (if any)
if s.m.Type == snap.TypeKernel {
if err := removeKernelAssets(s, inter); err != nil {
logger.Noticef("removing kernel assets failed with %s", err)
}
}
return nil
}
// extractKernelAssets extracts kernel/initrd/dtb data from the given
// SnapPart to a versionized bootloader directory so that the bootloader
// can use it.
func extractKernelAssets(s *SnapFile, inter progress.Meter, flags InstallFlags) error {
if s.m.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.Gadget.Hardware.Bootloader == "grub" {
return nil
}
}
// FIXME: feels wrong to use the instdir here, need something better
//
// now do the kernel specific bits
blobName := filepath.Base(squashfs.BlobPath(s.instdir))
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.m.Kernel, s.m.Initrd} {
if src == "" {
continue
}
if err := s.deb.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.m.Dtbs != "" {
src := filepath.Join(s.m.Dtbs, "*")
dst := dstDir
if err := s.deb.Unpack(src, dst); err != nil {
return err
}
}
return dir.Sync()
}
// Uninstall removes the given local snap from the system.
//
// It returns an error on failure
func (o *Overlord) Uninstall(s *SnapPart, meter progress.Meter) error {
// Gadget snaps should not be removed as they are a key
// building block for Gadgets. Prunning non active ones
// is acceptible.
if s.m.Type == snap.TypeGadget && s.IsActive() {
return ErrPackageNotRemovable
}
// You never want to remove an active kernel or OS
if (s.m.Type == snap.TypeKernel || s.m.Type == snap.TypeOS) && s.IsActive() {
return ErrPackageNotRemovable
}
if IsBuiltInSoftware(s.Name()) && s.IsActive() {
return ErrPackageNotRemovable
}
deps, err := s.DependentNames()
if err != nil {
return err
}
if len(deps) != 0 {
return ErrFrameworkInUse(deps)
}
if err := s.deactivate(false, meter); err != nil && err != ErrSnapNotActive {
return err
}
// ensure mount unit stops
if err := removeSquashfsMount(s.m, s.basedir, meter); err != nil {
return err
}
err = os.RemoveAll(s.basedir)
if err != nil {
return err
}
// best effort(?)
os.Remove(filepath.Dir(s.basedir))
// remove the snap
if err := os.RemoveAll(squashfs.BlobPath(s.basedir)); err != nil {
return err
}
// remove the kernel assets (if any)
if s.m.Type == snap.TypeKernel {
if err := removeKernelAssets(s, meter); err != nil {
logger.Noticef("removing kernel assets failed with %s", err)
}
}
return RemoveAllHWAccess(QualifiedName(s))
}
// removeKernelAssets removes the unpacked kernel/initrd for the given
// kernel snap
func removeKernelAssets(s *SnapPart, inter interacter) error {
if s.m.Type != snap.TypeKernel {
return fmt.Errorf("can not remove kernel assets from snap type %q", s.Type())
}
bootloader, err := findBootloader()
if err != nil {
return fmt.Errorf("no not remove kernel assests: %s", err)
}
// remove the kernel blob
blobName := filepath.Base(squashfs.BlobPath(s.basedir))
dstDir := filepath.Join(bootloader.Dir(), blobName)
if err := os.RemoveAll(dstDir); err != nil {
return err
}
return nil
}
func (m *packageYaml) addSquashfsMount(baseDir string, inhibitHooks bool, inter interacter) error {
squashfsPath := stripGlobalRootDir(squashfs.BlobPath(baseDir))
whereDir := stripGlobalRootDir(baseDir)
sysd := systemd.New(dirs.GlobalRootDir, inter)
mountUnitName, err := sysd.WriteMountUnitFile(m.Name, squashfsPath, whereDir)
if err != nil {
return err
}
// we always enable the mount unit even in inhibit hooks
if err := sysd.Enable(mountUnitName); err != nil {
return err
}
if !inhibitHooks {
return sysd.Start(mountUnitName)
}
return nil
}
func kernelOrOsRebootRequired(s *SnapPart) bool {
if s.m.Type != snap.TypeKernel && s.m.Type != snap.TypeOS {
return false
}
bootloader, err := findBootloader()
if err != nil {
logger.Noticef("can not get boot settings: %s", err)
return false
}
var nextBoot, goodBoot string
switch s.m.Type {
case snap.TypeKernel:
nextBoot = "snappy_kernel"
goodBoot = "snappy_good_kernel"
case snap.TypeOS:
nextBoot = "snappy_os"
goodBoot = "snappy_good_os"
}
nextBootVer, err := bootloader.GetBootVar(nextBoot)
if err != nil {
return false
}
goodBootVer, err := bootloader.GetBootVar(goodBoot)
if err != nil {
return false
}
squashfsName := filepath.Base(stripGlobalRootDir(squashfs.BlobPath(s.basedir)))
if nextBootVer == squashfsName && goodBootVer != nextBootVer {
return true
}
return false
}
