Golang Info.MountFile方法代码示例

// setNextBoot will schedule the given os or kernel snap to be used in
// the next boot
func setNextBoot(s *snap.Info) error {
	if s.Type != snap.TypeOS && s.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.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
}

// 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()
}

func addSquashfsMount(s *snap.Info, inhibitHooks bool, inter interacter) error {
	squashfsPath := stripGlobalRootDir(s.MountFile())
	whereDir := stripGlobalRootDir(s.MountDir())

	sysd := systemd.New(dirs.GlobalRootDir, inter)
	mountUnitName, err := sysd.WriteMountUnitFile(s.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 *snap.Info) bool {
	if s.Type != snap.TypeKernel && s.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.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
}