Exemple #1
0
// Lookup queries the index for the blob ID and returns a restic.PackedBlob.
func (idx *Index) Lookup(id restic.ID, tpe restic.BlobType) (blobs []restic.PackedBlob, err error) {
	idx.m.Lock()
	defer idx.m.Unlock()

	h := restic.BlobHandle{ID: id, Type: tpe}

	if packs, ok := idx.pack[h]; ok {
		blobs = make([]restic.PackedBlob, 0, len(packs))

		for _, p := range packs {
			debug.Log("id %v found in pack %v at %d, length %d",
				id.Str(), p.packID.Str(), p.offset, p.length)

			blob := restic.PackedBlob{
				Blob: restic.Blob{
					Type:   tpe,
					Length: p.length,
					ID:     id,
					Offset: p.offset,
				},
				PackID: p.packID,
			}

			blobs = append(blobs, blob)
		}

		return blobs, nil
	}

	debug.Log("id %v not found", id.Str())
	return nil, errors.Errorf("id %v not found in index", id)
}
Exemple #2
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// LoadTree loads a tree from the repository.
func (r *Repository) LoadTree(id restic.ID) (*restic.Tree, error) {
	debug.Log("load tree %v", id.Str())

	size, err := r.idx.LookupSize(id, restic.TreeBlob)
	if err != nil {
		return nil, err
	}

	debug.Log("size is %d, create buffer", size)
	buf := make([]byte, size)

	n, err := r.loadBlob(id, restic.TreeBlob, buf)
	if err != nil {
		return nil, err
	}
	buf = buf[:n]

	t := &restic.Tree{}
	err = json.Unmarshal(buf, t)
	if err != nil {
		return nil, err
	}

	return t, nil
}
Exemple #3
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// Tree walks the tree specified by id recursively and sends a job for each
// file and directory it finds. When the channel done is closed, processing
// stops.
func Tree(repo TreeLoader, id restic.ID, done chan struct{}, jobCh chan<- TreeJob) {
	debug.Log("start on %v, start workers", id.Str())

	load := func(id restic.ID) (*restic.Tree, error) {
		tree, err := repo.LoadTree(id)
		if err != nil {
			return nil, err
		}
		return tree, nil
	}

	ch := make(chan loadTreeJob)

	var wg sync.WaitGroup
	for i := 0; i < loadTreeWorkers; i++ {
		wg.Add(1)
		go loadTreeWorker(&wg, ch, load, done)
	}

	tw := NewTreeWalker(ch, jobCh)
	tw.Walk("", id, done)
	close(jobCh)

	close(ch)
	wg.Wait()

	debug.Log("done")
}
Exemple #4
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// Walk starts walking the tree given by id. When the channel done is closed,
// processing stops.
func (tw *TreeWalker) Walk(path string, id restic.ID, done chan struct{}) {
	debug.Log("starting on tree %v for %v", id.Str(), path)
	defer debug.Log("done walking tree %v for %v", id.Str(), path)

	resCh := make(chan loadTreeResult, 1)
	tw.ch <- loadTreeJob{
		id:  id,
		res: resCh,
	}

	res := <-resCh
	if res.err != nil {
		select {
		case tw.out <- TreeJob{Path: path, Error: res.err}:
		case <-done:
			return
		}
		return
	}

	tw.walk(path, res.tree, done)

	select {
	case tw.out <- TreeJob{Path: path, Tree: res.tree}:
	case <-done:
		return
	}
}
Exemple #5
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func (c *Checker) checkTree(id restic.ID, tree *restic.Tree) (errs []error) {
	debug.Log("checking tree %v", id.Str())

	var blobs []restic.ID

	for _, node := range tree.Nodes {
		switch node.Type {
		case "file":
			if node.Content == nil {
				errs = append(errs, Error{TreeID: id, Err: errors.Errorf("file %q has nil blob list", node.Name)})
			}

			for b, blobID := range node.Content {
				if blobID.IsNull() {
					errs = append(errs, Error{TreeID: id, Err: errors.Errorf("file %q blob %d has null ID", node.Name, b)})
					continue
				}
				blobs = append(blobs, blobID)
			}
		case "dir":
			if node.Subtree == nil {
				errs = append(errs, Error{TreeID: id, Err: errors.Errorf("dir node %q has no subtree", node.Name)})
				continue
			}

			if node.Subtree.IsNull() {
				errs = append(errs, Error{TreeID: id, Err: errors.Errorf("dir node %q subtree id is null", node.Name)})
				continue
			}

		case "symlink", "socket", "chardev", "dev", "fifo":
			// nothing to check

		default:
			errs = append(errs, Error{TreeID: id, Err: errors.Errorf("node %q with invalid type %q", node.Name, node.Type)})
		}

		if node.Name == "" {
			errs = append(errs, Error{TreeID: id, Err: errors.New("node with empty name")})
		}
	}

	for _, blobID := range blobs {
		c.blobRefs.Lock()
		c.blobRefs.M[blobID]++
		debug.Log("blob %v refcount %d", blobID.Str(), c.blobRefs.M[blobID])
		c.blobRefs.Unlock()

		if !c.blobs.Has(blobID) {
			debug.Log("tree %v references blob %v which isn't contained in index", id.Str(), blobID.Str())

			errs = append(errs, Error{TreeID: id, BlobID: blobID, Err: errors.New("not found in index")})
		}
	}

	return errs
}
Exemple #6
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func loadIndexJSON(repo restic.Repository, id restic.ID) (*indexJSON, error) {
	debug.Log("process index %v\n", id.Str())

	var idx indexJSON
	err := repo.LoadJSONUnpacked(restic.IndexFile, id, &idx)
	if err != nil {
		return nil, err
	}

	return &idx, nil
}
Exemple #7
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// LoadIndex loads the index id from backend and returns it.
func LoadIndex(repo restic.Repository, id restic.ID) (*Index, error) {
	idx, err := LoadIndexWithDecoder(repo, id, DecodeIndex)
	if err == nil {
		return idx, nil
	}

	if errors.Cause(err) == ErrOldIndexFormat {
		fmt.Fprintf(os.Stderr, "index %v has old format\n", id.Str())
		return LoadIndexWithDecoder(repo, id, DecodeOldIndex)
	}

	return nil, err
}
Exemple #8
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func loadTreeFromSnapshot(repo restic.Repository, id restic.ID) (restic.ID, error) {
	sn, err := restic.LoadSnapshot(repo, id)
	if err != nil {
		debug.Log("error loading snapshot %v: %v", id.Str(), err)
		return restic.ID{}, err
	}

	if sn.Tree == nil {
		debug.Log("snapshot %v has no tree", id.Str())
		return restic.ID{}, errors.Errorf("snapshot %v has no tree", id)
	}

	return *sn.Tree, nil
}
Exemple #9
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// SetID sets the ID the index has been written to. This requires that
// Finalize() has been called before, otherwise an error is returned.
func (idx *Index) SetID(id restic.ID) error {
	idx.m.Lock()
	defer idx.m.Unlock()

	if !idx.final {
		return errors.New("indexs is not final")
	}

	if !idx.id.IsNull() {
		return errors.New("ID already set")
	}

	debug.Log("ID set to %v", id.Str())
	idx.id = id

	return nil
}
Exemple #10
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// LoadIndexWithDecoder loads the index and decodes it with fn.
func LoadIndexWithDecoder(repo restic.Repository, id restic.ID, fn func(io.Reader) (*Index, error)) (idx *Index, err error) {
	debug.Log("Loading index %v", id.Str())

	buf, err := repo.LoadAndDecrypt(restic.IndexFile, id)
	if err != nil {
		return nil, err
	}

	idx, err = fn(bytes.NewReader(buf))
	if err != nil {
		debug.Log("error while decoding index %v: %v", id, err)
		return nil, err
	}

	idx.id = id

	return idx, nil
}
Exemple #11
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// RemovePack deletes a pack from the index.
func (idx *Index) RemovePack(id restic.ID) error {
	if _, ok := idx.Packs[id]; !ok {
		return errors.Errorf("pack %v not found in the index", id.Str())
	}

	for _, blob := range idx.Packs[id].Entries {
		h := restic.BlobHandle{ID: blob.ID, Type: blob.Type}
		idx.Blobs[h].Packs.Delete(id)

		if len(idx.Blobs[h].Packs) == 0 {
			delete(idx.Blobs, h)
		}
	}

	delete(idx.Packs, id)

	return nil
}
Exemple #12
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// SaveAndEncrypt encrypts data and stores it to the backend as type t. If data
// is small enough, it will be packed together with other small blobs.
func (r *Repository) SaveAndEncrypt(t restic.BlobType, data []byte, id *restic.ID) (restic.ID, error) {
	if id == nil {
		// compute plaintext hash
		hashedID := restic.Hash(data)
		id = &hashedID
	}

	debug.Log("save id %v (%v, %d bytes)", id.Str(), t, len(data))

	// get buf from the pool
	ciphertext := getBuf()
	defer freeBuf(ciphertext)

	// encrypt blob
	ciphertext, err := r.Encrypt(ciphertext, data)
	if err != nil {
		return restic.ID{}, err
	}

	// find suitable packer and add blob
	packer, err := r.findPacker(uint(len(ciphertext)))
	if err != nil {
		return restic.ID{}, err
	}

	// save ciphertext
	_, err = packer.Add(t, *id, ciphertext)
	if err != nil {
		return restic.ID{}, err
	}

	// if the pack is not full enough and there are less than maxPackers
	// packers, put back to the list
	if packer.Size() < minPackSize && r.countPacker() < maxPackers {
		debug.Log("pack is not full enough (%d bytes)", packer.Size())
		r.insertPacker(packer)
		return *id, nil
	}

	// else write the pack to the backend
	return *id, r.savePacker(packer)
}
Exemple #13
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// LoadBlob loads a blob of type t from the repository to the buffer.
func (r *Repository) LoadBlob(t restic.BlobType, id restic.ID, buf []byte) (int, error) {
	debug.Log("load blob %v into buf %p", id.Str(), buf)
	size, err := r.idx.LookupSize(id, t)
	if err != nil {
		return 0, err
	}

	if len(buf) < int(size) {
		return 0, errors.Errorf("buffer is too small for data blob (%d < %d)", len(buf), size)
	}

	n, err := r.loadBlob(id, t, buf)
	if err != nil {
		return 0, err
	}
	buf = buf[:n]

	debug.Log("loaded %d bytes into buf %p", len(buf), buf)

	return len(buf), err
}
Exemple #14
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// AddPack adds a pack to the index. If this pack is already in the index, an
// error is returned.
func (idx *Index) AddPack(id restic.ID, size int64, entries []restic.Blob) error {
	if _, ok := idx.Packs[id]; ok {
		return errors.Errorf("pack %v already present in the index", id.Str())
	}

	idx.Packs[id] = Pack{Size: size, Entries: entries}

	for _, entry := range entries {
		h := restic.BlobHandle{ID: entry.ID, Type: entry.Type}
		if _, ok := idx.Blobs[h]; !ok {
			idx.Blobs[h] = Blob{
				Size:  int64(entry.Length),
				Packs: restic.NewIDSet(),
			}
		}

		idx.Blobs[h].Packs.Insert(id)
	}

	return nil
}
Exemple #15
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// LoadAndDecrypt loads and decrypts data identified by t and id from the
// backend.
func (r *Repository) LoadAndDecrypt(t restic.FileType, id restic.ID) ([]byte, error) {
	debug.Log("load %v with id %v", t, id.Str())

	h := restic.Handle{Type: t, Name: id.String()}
	buf, err := backend.LoadAll(r.be, h, nil)
	if err != nil {
		debug.Log("error loading %v: %v", id.Str(), err)
		return nil, err
	}

	if t != restic.ConfigFile && !restic.Hash(buf).Equal(id) {
		return nil, errors.New("invalid data returned")
	}

	plain := make([]byte, len(buf))

	// decrypt
	n, err := r.decryptTo(plain, buf)
	if err != nil {
		return nil, err
	}

	return plain[:n], nil
}
Exemple #16
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func findInSnapshot(repo *repository.Repository, pat findPattern, id restic.ID) error {
	debug.Log("searching in snapshot %s\n  for entries within [%s %s]", id.Str(), pat.oldest, pat.newest)

	sn, err := restic.LoadSnapshot(repo, id)
	if err != nil {
		return err
	}

	results, err := findInTree(repo, pat, *sn.Tree, "")
	if err != nil {
		return err
	}

	if len(results) == 0 {
		return nil
	}
	Verbosef("found %d matching entries in snapshot %s\n", len(results), id)
	for _, res := range results {
		res.node.Name = filepath.Join(res.path, res.node.Name)
		Printf("  %s\n", res.node)
	}

	return nil
}
Exemple #17
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// checkPack reads a pack and checks the integrity of all blobs.
func checkPack(r restic.Repository, id restic.ID) error {
	debug.Log("checking pack %v", id.Str())
	h := restic.Handle{Type: restic.DataFile, Name: id.String()}
	buf, err := backend.LoadAll(r.Backend(), h, nil)
	if err != nil {
		return err
	}

	hash := restic.Hash(buf)
	if !hash.Equal(id) {
		debug.Log("Pack ID does not match, want %v, got %v", id.Str(), hash.Str())
		return errors.Errorf("Pack ID does not match, want %v, got %v", id.Str(), hash.Str())
	}

	blobs, err := pack.List(r.Key(), bytes.NewReader(buf), int64(len(buf)))
	if err != nil {
		return err
	}

	var errs []error
	for i, blob := range blobs {
		debug.Log("  check blob %d: %v", i, blob.ID.Str())

		plainBuf := make([]byte, blob.Length)
		n, err := crypto.Decrypt(r.Key(), plainBuf, buf[blob.Offset:blob.Offset+blob.Length])
		if err != nil {
			debug.Log("  error decrypting blob %v: %v", blob.ID.Str(), err)
			errs = append(errs, errors.Errorf("blob %v: %v", i, err))
			continue
		}
		plainBuf = plainBuf[:n]

		hash := restic.Hash(plainBuf)
		if !hash.Equal(blob.ID) {
			debug.Log("  Blob ID does not match, want %v, got %v", blob.ID.Str(), hash.Str())
			errs = append(errs, errors.Errorf("Blob ID does not match, want %v, got %v", blob.ID.Str(), hash.Str()))
			continue
		}
	}

	if len(errs) > 0 {
		return errors.Errorf("pack %v contains %v errors: %v", id.Str(), len(errs), errs)
	}

	return nil
}
Exemple #18
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// Save stores a blob read from rd in the repository.
func (arch *Archiver) Save(t restic.BlobType, data []byte, id restic.ID) error {
	debug.Log("Save(%v, %v)\n", t, id.Str())

	if arch.isKnownBlob(id, restic.DataBlob) {
		debug.Log("blob %v is known\n", id.Str())
		return nil
	}

	_, err := arch.repo.SaveBlob(t, data, id)
	if err != nil {
		debug.Log("Save(%v, %v): error %v\n", t, id.Str(), err)
		return err
	}

	debug.Log("Save(%v, %v): new blob\n", t, id.Str())
	return nil
}
Exemple #19
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// Lookup queries all known Indexes for the ID and returns the first match.
func (mi *MasterIndex) Lookup(id restic.ID, tpe restic.BlobType) (blobs []restic.PackedBlob, err error) {
	mi.idxMutex.RLock()
	defer mi.idxMutex.RUnlock()

	debug.Log("looking up id %v, tpe %v", id.Str(), tpe)

	for _, idx := range mi.idx {
		blobs, err = idx.Lookup(id, tpe)
		if err == nil {
			debug.Log("MasterIndex.Lookup",
				"found id %v: %v", id.Str(), blobs)
			return
		}
	}

	debug.Log("id %v not found in any index", id.Str())
	return nil, errors.Errorf("id %v not found in any index", id)
}
Exemple #20
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func runCat(gopts GlobalOptions, args []string) error {
	if len(args) < 1 || (args[0] != "masterkey" && args[0] != "config" && len(args) != 2) {
		return errors.Fatalf("type or ID not specified")
	}

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

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

	tpe := args[0]

	var id restic.ID
	if tpe != "masterkey" && tpe != "config" {
		id, err = restic.ParseID(args[1])
		if err != nil {
			if tpe != "snapshot" {
				return errors.Fatalf("unable to parse ID: %v\n", err)
			}

			// find snapshot id with prefix
			id, err = restic.FindSnapshot(repo, args[1])
			if err != nil {
				return err
			}
		}
	}

	// handle all types that don't need an index
	switch tpe {
	case "config":
		buf, err := json.MarshalIndent(repo.Config(), "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(buf))
		return nil
	case "index":
		buf, err := repo.LoadAndDecrypt(restic.IndexFile, id)
		if err != nil {
			return err
		}

		_, err = os.Stdout.Write(append(buf, '\n'))
		return err

	case "snapshot":
		sn := &restic.Snapshot{}
		err = repo.LoadJSONUnpacked(restic.SnapshotFile, id, sn)
		if err != nil {
			return err
		}

		buf, err := json.MarshalIndent(&sn, "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(buf))

		return nil
	case "key":
		h := restic.Handle{Type: restic.KeyFile, Name: id.String()}
		buf, err := backend.LoadAll(repo.Backend(), h, nil)
		if err != nil {
			return err
		}

		key := &repository.Key{}
		err = json.Unmarshal(buf, key)
		if err != nil {
			return err
		}

		buf, err = json.MarshalIndent(&key, "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(buf))
		return nil
	case "masterkey":
		buf, err := json.MarshalIndent(repo.Key(), "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(buf))
		return nil
	case "lock":
		lock, err := restic.LoadLock(repo, id)
		if err != nil {
			return err
		}

		buf, err := json.MarshalIndent(&lock, "", "  ")
		if err != nil {
			return err
		}

		fmt.Println(string(buf))

		return nil
	}

	// load index, handle all the other types
	err = repo.LoadIndex()
	if err != nil {
		return err
	}

	switch tpe {
	case "pack":
		h := restic.Handle{Type: restic.DataFile, Name: id.String()}
		buf, err := backend.LoadAll(repo.Backend(), h, nil)
		if err != nil {
			return err
		}

		hash := restic.Hash(buf)
		if !hash.Equal(id) {
			fmt.Fprintf(stderr, "Warning: hash of data does not match ID, want\n  %v\ngot:\n  %v\n", id.String(), hash.String())
		}

		_, err = os.Stdout.Write(buf)
		return err

	case "blob":
		for _, t := range []restic.BlobType{restic.DataBlob, restic.TreeBlob} {
			list, err := repo.Index().Lookup(id, t)
			if err != nil {
				continue
			}
			blob := list[0]

			buf := make([]byte, blob.Length)
			n, err := repo.LoadBlob(restic.DataBlob, id, buf)
			if err != nil {
				return err
			}
			buf = buf[:n]

			_, err = os.Stdout.Write(buf)
			return err
		}

		return errors.Fatal("blob not found")

	case "tree":
		debug.Log("cat tree %v", id.Str())
		tree, err := repo.LoadTree(id)
		if err != nil {
			debug.Log("unable to load tree %v: %v", id.Str(), err)
			return err
		}

		buf, err := json.MarshalIndent(&tree, "", "  ")
		if err != nil {
			debug.Log("error json.MarshalIndent(): %v", err)
			return err
		}

		_, err = os.Stdout.Write(append(buf, '\n'))
		return nil

	default:
		return errors.Fatal("invalid type")
	}
}
Exemple #21
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// loadBlob tries to load and decrypt content identified by t and id from a
// pack from the backend, the result is stored in plaintextBuf, which must be
// large enough to hold the complete blob.
func (r *Repository) loadBlob(id restic.ID, t restic.BlobType, plaintextBuf []byte) (int, error) {
	debug.Log("load %v with id %v (buf %p, len %d)", t, id.Str(), plaintextBuf, len(plaintextBuf))

	// lookup plaintext size of blob
	size, err := r.idx.LookupSize(id, t)
	if err != nil {
		return 0, err
	}

	// make sure the plaintext buffer is large enough, extend otherwise
	if len(plaintextBuf) < int(size) {
		return 0, errors.Errorf("buffer is too small: %d < %d", len(plaintextBuf), size)
	}

	// lookup packs
	blobs, err := r.idx.Lookup(id, t)
	if err != nil {
		debug.Log("id %v not found in index: %v", id.Str(), err)
		return 0, err
	}

	var lastError error
	for _, blob := range blobs {
		debug.Log("id %v found: %v", id.Str(), blob)

		if blob.Type != t {
			debug.Log("blob %v has wrong block type, want %v", blob, t)
		}

		// load blob from pack
		h := restic.Handle{Type: restic.DataFile, Name: blob.PackID.String()}
		ciphertextBuf := make([]byte, blob.Length)
		n, err := r.be.Load(h, ciphertextBuf, int64(blob.Offset))
		if err != nil {
			debug.Log("error loading blob %v: %v", blob, err)
			lastError = err
			continue
		}

		if uint(n) != blob.Length {
			lastError = errors.Errorf("error loading blob %v: wrong length returned, want %d, got %d",
				id.Str(), blob.Length, uint(n))
			debug.Log("lastError: %v", lastError)
			continue
		}

		// decrypt
		n, err = r.decryptTo(plaintextBuf, ciphertextBuf)
		if err != nil {
			lastError = errors.Errorf("decrypting blob %v failed: %v", id, err)
			continue
		}
		plaintextBuf = plaintextBuf[:n]

		// check hash
		if !restic.Hash(plaintextBuf).Equal(id) {
			lastError = errors.Errorf("blob %v returned invalid hash", id)
			continue
		}

		return len(plaintextBuf), nil
	}

	if lastError != nil {
		return 0, lastError
	}

	return 0, errors.Errorf("loading blob %v from %v packs failed", id.Str(), len(blobs))
}
Exemple #22
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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
}