func (x *cmdBooted) Execute(args []string) error {
if len(args) > 0 {
return ErrExtraArgs
}
if release.OnClassic {
fmt.Fprintf(Stdout, i18n.G("Ignoring 'booted' on classic"))
return nil
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf(i18n.G("cannot mark boot successful: %s"), err)
}
if err := partition.MarkBootSuccessful(bootloader); err != nil {
return err
}
ovld, err := overlord.New()
if err != nil {
return err
}
return boot.UpdateRevisions(ovld)
}
// KernelOrOsRebootRequired returns whether a reboot is required to swith to the given OS or kernel snap.
func KernelOrOsRebootRequired(s *snap.Info) bool {
if s.Type != snap.TypeKernel && s.Type != snap.TypeOS {
return false
}
bootloader, err := partition.FindBootloader()
if err != nil {
logger.Noticef("cannot get boot settings: %s", err)
return false
}
var nextBoot, goodBoot string
switch s.Type {
case snap.TypeKernel:
nextBoot = "snap_try_kernel"
goodBoot = "snap_kernel"
case snap.TypeOS:
nextBoot = "snap_try_core"
goodBoot = "snap_core"
}
m, err := bootloader.GetBootVars(nextBoot, goodBoot)
if err != nil {
return false
}
squashfsName := filepath.Base(s.MountFile())
if m[nextBoot] == squashfsName && m[goodBoot] != m[nextBoot] {
return true
}
return false
}
// SetNextBoot will schedule the given OS or kernel snap to be used in
// the next boot
func SetNextBoot(s *snap.Info) error {
if release.OnClassic {
return nil
}
if s.Type != snap.TypeOS && s.Type != snap.TypeKernel {
return nil
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf("cannot set next boot: %s", err)
}
var bootvar string
switch s.Type {
case snap.TypeOS:
bootvar = "snap_try_core"
case snap.TypeKernel:
bootvar = "snap_try_kernel"
}
blobName := filepath.Base(s.MountFile())
if err := bootloader.SetBootVar(bootvar, blobName); err != nil {
return err
}
if err := bootloader.SetBootVar("snap_mode", "try"); err != nil {
return err
}
return nil
}
// UpdateBootRevisions synchronizes the active kernel and OS snap versions
// with the versions that actually booted. This is needed because a
// system may install "os=v2" but that fails to boot. The bootloader
// fallback logic will revert to "os=v1" but on the filesystem snappy
// still has the "active" version set to "v2" which is
// misleading. This code will check what kernel/os booted and set
// those versions active.To do this it creates a Change and kicks
// start it directly.
func UpdateBootRevisions(st *state.State) error {
const errorPrefix = "cannot update revisions after boot changes: "
if release.OnClassic {
return nil
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
m, err := bootloader.GetBootVars("snap_kernel", "snap_core")
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
var tsAll []*state.TaskSet
for _, snapNameAndRevno := range []string{m["snap_kernel"], m["snap_core"]} {
name, rev, err := nameAndRevnoFromSnap(snapNameAndRevno)
if err != nil {
logger.Noticef("cannot parse %q: %s", snapNameAndRevno, err)
continue
}
info, err := CurrentInfo(st, name)
if err != nil {
logger.Noticef("cannot get info for %q: %s", name, err)
continue
}
if rev != info.SideInfo.Revision {
// FIXME: check that there is no task
// for this already in progress
ts, err := RevertToRevision(st, name, rev, Flags{})
if err != nil {
return err
}
tsAll = append(tsAll, ts)
}
}
if len(tsAll) == 0 {
return nil
}
msg := fmt.Sprintf("Update kernel and core snap revisions")
chg := st.NewChange("update-revisions", msg)
for _, ts := range tsAll {
chg.AddAll(ts)
}
st.EnsureBefore(0)
return nil
}
// RemoveKernelAssets removes the unpacked kernel/initrd for the given
// kernel snap.
func RemoveKernelAssets(s snap.PlaceInfo) error {
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf("no not remove kernel assets: %s", err)
}
// remove the kernel blob
blobName := filepath.Base(s.MountFile())
dstDir := filepath.Join(bootloader.Dir(), blobName)
if err := os.RemoveAll(dstDir); err != nil {
return err
}
return nil
}
func setBootvars(downloadedSnapsInfo map[string]*snap.Info) error {
// Set bootvars for kernel/core snaps so the system boots and
// does the first-time initialization. There is also no
// mounted kernel/core snap, but just the blobs.
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf("cannot set kernel/core boot variables: %s", err)
}
snaps, err := filepath.Glob(filepath.Join(dirs.SnapBlobDir, "*.snap"))
if len(snaps) == 0 || err != nil {
return fmt.Errorf("internal error: cannot find core/kernel snap")
}
m := map[string]string{
"snap_mode": "",
"snap_try_core": "",
"snap_try_kernel": "",
}
for _, fn := range snaps {
bootvar := ""
info := downloadedSnapsInfo[fn]
switch info.Type {
case snap.TypeOS:
bootvar = "snap_core"
case snap.TypeKernel:
bootvar = "snap_kernel"
if err := extractKernelAssets(fn, info); err != nil {
return err
}
}
if bootvar != "" {
name := filepath.Base(fn)
m[bootvar] = name
}
}
if err := bootloader.SetBootVars(m); err != nil {
return err
}
return nil
}
func (m *DeviceManager) ensureBootOk() error {
m.state.Lock()
defer m.state.Unlock()
if release.OnClassic {
return nil
}
if !m.bootOkRan {
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf(i18n.G("cannot mark boot successful: %s"), err)
}
if err := partition.MarkBootSuccessful(bootloader); err != nil {
return err
}
m.bootOkRan = true
}
return snapstate.UpdateBootRevisions(m.state)
}
// ExtractKernelAssets extracts kernel/initrd/dtb data from the given
// kernel snap, if required, to a versioned bootloader directory so
// that the bootloader can use it.
func ExtractKernelAssets(s *snap.Info, snapf snap.Container) error {
if s.Type != snap.TypeKernel {
return fmt.Errorf("cannot extract kernel assets from snap type %q", s.Type)
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf("cannot extract kernel assets: %s", err)
}
if bootloader.Name() == "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{"kernel.img", "initrd.img"} {
if err := snapf.Unpack(src, dstDir); err != nil {
return err
}
if err := dir.Sync(); err != nil {
return err
}
}
if err := snapf.Unpack("dtbs/*", dstDir); err != nil {
return err
}
return dir.Sync()
}
// InUse checks if the given name/revision is used in the
// boot environment
func InUse(name string, rev snap.Revision) bool {
bootloader, err := partition.FindBootloader()
if err != nil {
logger.Noticef("cannot get boot settings: %s", err)
return false
}
bootVars, err := bootloader.GetBootVars("snap_kernel", "snap_try_kernel", "snap_core", "snap_try_core")
if err != nil {
logger.Noticef("cannot get boot vars: %s", err)
return false
}
snapFile := filepath.Base(snap.MountFile(name, rev))
for _, bootVar := range bootVars {
if bootVar == snapFile {
return true
}
}
return false
}
// SetNextBoot will schedule the given OS or kernel snap to be used in
// the next boot
func SetNextBoot(s *snap.Info) error {
if release.OnClassic {
return nil
}
if s.Type != snap.TypeOS && s.Type != snap.TypeKernel {
return nil
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf("cannot set next boot: %s", err)
}
var nextBoot, goodBoot string
switch s.Type {
case snap.TypeOS:
nextBoot = "snap_try_core"
goodBoot = "snap_core"
case snap.TypeKernel:
nextBoot = "snap_try_kernel"
goodBoot = "snap_kernel"
}
blobName := filepath.Base(s.MountFile())
// check if we actually need to do anything, i.e. the exact same
// kernel/core revision got installed again (e.g. firstboot)
m, err := bootloader.GetBootVars(goodBoot)
if err != nil {
return err
}
if m[goodBoot] == blobName {
return nil
}
return bootloader.SetBootVars(map[string]string{
nextBoot: blobName,
"snap_mode": "try",
})
}
// UpdateRevisions synchronizes the active kernel and OS snap versions with
// the versions that actually booted. This is needed because a
// system may install "os=v2" but that fails to boot. The bootloader
// fallback logic will revert to "os=v1" but on the filesystem snappy
// still has the "active" version set to "v2" which is
// misleading. This code will check what kernel/os booted and set
// those versions active.
func UpdateRevisions(ovld *overlord.Overlord) error {
const errorPrefix = "cannot update revisions after boot changes: "
if release.OnClassic {
return nil
}
bootloader, err := partition.FindBootloader()
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
bv := "snap_kernel"
kernelSnap, err := bootloader.GetBootVar(bv)
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
bv = "snap_core"
osSnap, err := bootloader.GetBootVar(bv)
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
st := ovld.State()
st.Lock()
installed, err := snapstate.All(st)
if err != nil {
return fmt.Errorf(errorPrefix+"%s", err)
}
var tsAll []*state.TaskSet
for _, snapNameAndRevno := range []string{kernelSnap, osSnap} {
name, rev, err := nameAndRevnoFromSnap(snapNameAndRevno)
if err != nil {
logger.Noticef("cannot parse %q: %s", snapNameAndRevno, err)
continue
}
for snapName, snapState := range installed {
if name == snapName {
if rev != snapState.Current {
ts, err := snapstate.RevertToRevision(st, name, rev, snapstate.Flags(0))
if err != nil {
return err
}
tsAll = append(tsAll, ts)
}
}
}
}
st.Unlock()
if len(tsAll) == 0 {
return nil
}
st.Lock()
msg := fmt.Sprintf("Update kernel and core snap revisions")
chg := st.NewChange("update-revisions", msg)
for _, ts := range tsAll {
chg.AddAll(ts)
}
st.Unlock()
// do it and wait for ready
ovld.Loop()
timeoutTime := 10 * time.Second
st.EnsureBefore(0)
select {
case <-chg.Ready():
case <-time.After(timeoutTime):
return fmt.Errorf("change did not apply after %s", timeoutTime)
}
st.Lock()
status := chg.Status()
err = chg.Err()
st.Unlock()
if status != state.DoneStatus {
ovld.Stop()
return fmt.Errorf(errorPrefix+"%s", err)
}
return ovld.Stop()
}
