Beispiel #1
0
// gatherDevices returns the set of unique device ids of the files and/or
// directory paths listed in "items".
func gatherDevices(items []string) (deviceMap map[uint64]struct{}, err error) {
	deviceMap = make(map[uint64]struct{})
	for _, item := range items {
		fi, err := fs.Lstat(item)
		if err != nil {
			return nil, err
		}
		id, err := fs.DeviceID(fi)
		if err != nil {
			return nil, err
		}
		deviceMap[id] = struct{}{}
	}
	if len(deviceMap) == 0 {
		return nil, errors.New("zero allowed devices")
	}
	return deviceMap, nil
}
Beispiel #2
0
func runBackup(opts BackupOptions, gopts GlobalOptions, args []string) error {
	target, err := readLinesFromFile(opts.FilesFrom)
	if err != nil {
		return err
	}

	// merge files from files-from into normal args so we can reuse the normal
	// args checks and have the ability to use both files-from and args at the
	// same time
	args = append(args, target...)
	if len(args) == 0 {
		return errors.Fatalf("wrong number of parameters")
	}

	for _, d := range args {
		if a, err := filepath.Abs(d); err == nil {
			d = a
		}
		target = append(target, d)
	}

	target, err = filterExisting(target)
	if err != nil {
		return err
	}

	// allowed devices
	var allowedDevs map[uint64]struct{}
	if opts.ExcludeOtherFS {
		allowedDevs, err = gatherDevices(target)
		if err != nil {
			return err
		}
		debug.Log("allowed devices: %v\n", allowedDevs)
	}

	repo, err := OpenRepository(gopts)
	if err != nil {
		return err
	}

	lock, err := lockRepo(repo)
	defer unlockRepo(lock)
	if err != nil {
		return err
	}

	err = repo.LoadIndex()
	if err != nil {
		return err
	}

	var parentSnapshotID *restic.ID

	// Force using a parent
	if !opts.Force && opts.Parent != "" {
		id, err := restic.FindSnapshot(repo, opts.Parent)
		if err != nil {
			return errors.Fatalf("invalid id %q: %v", opts.Parent, err)
		}

		parentSnapshotID = &id
	}

	// Find last snapshot to set it as parent, if not already set
	if !opts.Force && parentSnapshotID == nil {
		id, err := restic.FindLatestSnapshot(repo, target, "")
		if err == nil {
			parentSnapshotID = &id
		} else if err != restic.ErrNoSnapshotFound {
			return err
		}
	}

	if parentSnapshotID != nil {
		Verbosef("using parent snapshot %v\n", parentSnapshotID.Str())
	}

	Verbosef("scan %v\n", target)

	// add patterns from file
	if opts.ExcludeFile != "" {
		file, err := fs.Open(opts.ExcludeFile)
		if err != nil {
			Warnf("error reading exclude patterns: %v", err)
			return nil
		}

		scanner := bufio.NewScanner(file)
		for scanner.Scan() {
			line := scanner.Text()
			if !strings.HasPrefix(line, "#") {
				line = os.ExpandEnv(line)
				opts.Excludes = append(opts.Excludes, line)
			}
		}
	}

	selectFilter := func(item string, fi os.FileInfo) bool {
		matched, err := filter.List(opts.Excludes, item)
		if err != nil {
			Warnf("error for exclude pattern: %v", err)
		}

		if matched {
			debug.Log("path %q excluded by a filter", item)
			return false
		}

		if !opts.ExcludeOtherFS || fi == nil {
			return true
		}

		id, err := fs.DeviceID(fi)
		if err != nil {
			// This should never happen because gatherDevices() would have
			// errored out earlier. If it still does that's a reason to panic.
			panic(err)
		}
		_, found := allowedDevs[id]
		if !found {
			debug.Log("path %q on disallowed device %d", item, id)
			return false
		}

		return true
	}

	stat, err := archiver.Scan(target, selectFilter, newScanProgress(gopts))
	if err != nil {
		return err
	}

	arch := archiver.New(repo)
	arch.Excludes = opts.Excludes
	arch.SelectFilter = selectFilter

	arch.Error = func(dir string, fi os.FileInfo, err error) error {
		// TODO: make ignoring errors configurable
		Warnf("%s\rerror for %s: %v\n", ClearLine(), dir, err)
		return nil
	}

	_, id, err := arch.Snapshot(newArchiveProgress(gopts, stat), target, opts.Tags, parentSnapshotID)
	if err != nil {
		return err
	}

	Verbosef("snapshot %s saved\n", id.Str())

	return nil
}