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kernel_os.go
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/
kernel_os.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2015 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package boot
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"github.com/snapcore/snapd/logger"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/partition"
"github.com/snapcore/snapd/progress"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/snap"
)
// RemoveKernelAssets removes the unpacked kernel/initrd for the given
// kernel snap.
func RemoveKernelAssets(s snap.PlaceInfo, inter progress.Meter) 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 copyAll(src, dst string) error {
if output, err := exec.Command("cp", "-a", src, dst).CombinedOutput(); err != nil {
return fmt.Errorf("cannot copy %q -> %q: %s (%s)", src, dst, err, output)
}
return nil
}
// 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, inter progress.Meter) error {
if s.Type != snap.TypeKernel {
return fmt.Errorf("cannot extract kernel assets from snap type %q", s.Type)
}
// sanity check that we have the new kernel format
_, err := snap.ReadKernelInfo(s)
if err != nil {
return err
}
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{
filepath.Join(s.MountDir(), "kernel.img"),
filepath.Join(s.MountDir(), "initrd.img"),
} {
if err := copyAll(src, dstDir); err != nil {
return err
}
if err := dir.Sync(); err != nil {
return err
}
}
srcDir := filepath.Join(s.MountDir(), "dtbs")
if osutil.IsDirectory(srcDir) {
if err := copyAll(srcDir, dstDir); err != nil {
return err
}
}
return dir.Sync()
}
// 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 = "snappy_os"
case snap.TypeKernel:
bootvar = "snappy_kernel"
}
blobName := filepath.Base(s.MountFile())
if err := bootloader.SetBootVar(bootvar, blobName); err != nil {
return err
}
if err := bootloader.SetBootVar("snappy_mode", "try"); err != nil {
return err
}
return nil
}
// 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 = "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(s.MountFile())
if nextBootVer == squashfsName && goodBootVer != nextBootVer {
return true
}
return false
}