Stop snapshot purge when a snapshot cannot leave the local index (closes #337)

snapshot purge, and the purge step of snapshot create --prune, logged a
failed local index delete, then deleted that snapshot's metadata from
the destination store anyway and exited 0, leaving a local record whose
metadata was gone. It now stops at that snapshot with an error, before
touching its metadata, so the command exits non-zero; snapshots already
purged stay purged. This matches how the same loop already handles a
failed metadata delete.

Model: opus-5-5

ARCHITECTURE.md

@@ -279,8 +279,8 @@ Key methods:
 - `Scan(ctx, path, snapshotID)` → Main scan operation
 
 Scan phases:
-1. **Phase 1**: Walk directory, identify files needing processing
-2. **Phase 1b**: Count as deleted the files that the previous snapshot of the same name lists, the walk did not find, and are gone from disk; a file that is excluded, or inside an excluded directory, is not counted
+1. **Phase 0**: Detect deleted files from previous snapshots
+2. **Phase 1**: Walk directory, identify files needing processing
 3. **Phase 2**: Process files (chunk → pack → upload)
 
 #### SnapshotManager
@@ -320,13 +320,13 @@ CreateSnapshot(opts)
     │       │
     │       ├─► scanner.Scan(ctx, path, snapshotID)
     │       │       │
+    │       │       ├─► Phase 0: detectDeletedFiles()
+    │       │       │
     │       │       ├─► Phase 1: scanPhase()
     │       │       │       Walk directory
     │       │       │       Check file metadata changes
     │       │       │       Build list of files to process
     │       │       │
-    │       │       ├─► Phase 1b: detectDeletedFiles()
-    │       │       │
     │       │       └─► Phase 2: processPhase()
     │       │               For each file:
     │       │                   chunker.ChunkReaderStreaming()

README.md

@@ -339,7 +339,9 @@ local index alone, and still exits zero.
 
 **`snapshot purge`**: Remove old snapshots based on criteria. Retention is
 per-snapshot-name (`--keep-latest` keeps the latest of each name, not the
-latest globally).
+latest globally). If a snapshot cannot be removed from the local index, the
+command stops there, leaves that snapshot's metadata on the destination store
+and exits non-zero; `snapshot create --prune` fails the same way.
 * `--keep-latest`: Keep only the most recent snapshot of each name
 * `--older-than <duration>`: Remove snapshots older than duration (e.g. `30d`,
   `4w`, `6mo`, `1y`; `m` is minutes, `mo` is months)

internal/cli/entry_snapshot_purge_test.go

@@ -0,0 +1,90 @@
+package cli //nolint:testpackage // shares runEntry and the hermetic config helpers
+
+import (
+	"context"
+	"database/sql"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"sneak.berlin/go/vaultik/internal/database"
+	"sneak.berlin/go/vaultik/internal/snapshot"
+	"sneak.berlin/go/vaultik/internal/types"
+)
+
+// The `snapshot purge` command word and flags used below.
+const (
+	cmdPurge       = "purge"
+	flagKeepLatest = "--keep-latest"
+	flagForce      = "--force"
+)
+
+// TestEntrySnapshotPurgeKeepsMetadataWhenLocalIndexDeleteFails makes
+// removing a snapshot from the local index fail and checks that
+// `snapshot purge` exits non-zero and leaves that snapshot's metadata on
+// the destination store. It used to log the error, delete the metadata
+// anyway and exit 0.
+//
+//nolint:paralleltest // replaces os.Args, os.Stdout, os.Stderr and the xdg globals
+func TestEntrySnapshotPurgeKeepsMetadataWhenLocalIndexDeleteFails(t *testing.T) {
+	ctx := context.Background()
+	configPath := writeHermeticPruneConfig(t, false)
+
+	// writeHermeticPruneConfig puts the index and the store directory
+	// beside the config file.
+	dir := filepath.Dir(configPath)
+
+	// Two snapshots of the same name: --keep-latest purges the older.
+	olderStart := time.Date(2026, 5, 1, 9, 0, 0, 0, time.UTC)
+	newerStart := olderStart.Add(time.Hour)
+	olderID := "test-host_test_" + olderStart.Format(time.RFC3339)
+	newerID := "test-host_test_" + newerStart.Format(time.RFC3339)
+
+	db, err := database.New(ctx, filepath.Join(dir, "index.sqlite"))
+	require.NoError(t, err)
+
+	repos := database.NewRepositories(db)
+
+	manifestPaths := make(map[string]string)
+
+	for id, startedAt := range map[string]time.Time{
+		olderID: olderStart,
+		newerID: newerStart,
+	} {
+		completedAt := startedAt.Add(time.Minute)
+		snap := &database.Snapshot{
+			ID:             types.SnapshotID(id),
+			Hostname:       "test-host",
+			VaultikVersion: "test",
+			StartedAt:      startedAt,
+			CompletedAt:    &completedAt,
+		}
+
+		err = repos.WithTx(ctx, func(ctx context.Context, tx *sql.Tx) error {
+			return repos.Snapshots.Create(ctx, tx, snap)
+		})
+		require.NoError(t, err)
+
+		manifestPaths[id] = filepath.Join(dir, "store", "metadata",
+			snapshot.RemoteSnapshotKey(id), "manifest.json.zst")
+		require.NoError(t, os.MkdirAll(filepath.Dir(manifestPaths[id]), 0o750))
+		require.NoError(t, os.WriteFile(manifestPaths[id], []byte("stub"), 0o600))
+	}
+
+	_, err = db.Conn().ExecContext(ctx, `
+		CREATE TRIGGER refuse_snapshot_delete BEFORE DELETE ON snapshots
+		BEGIN SELECT RAISE(ABORT, 'simulated index error'); END`)
+	require.NoError(t, err)
+	require.NoError(t, db.Close())
+
+	code, _, stderr := runEntry(t,
+		flagConfig, configPath, cmdSnapshot, cmdPurge, flagKeepLatest, flagForce)
+
+	assert.Equal(t, 1, code)
+	assert.Contains(t, stderr, "simulated index error")
+	assert.FileExists(t, manifestPaths[olderID],
+		"a snapshot still in the local index keeps its metadata")
+}

internal/database/files.go

@@ -267,45 +267,6 @@ func (r *FileRepository) ListUnderPath(
 	return files, rows.Err()
 }
 
-// ListUnderPathInSnapshot returns the files that ListUnderPath returns
-// for path and that the snapshot lists, in no particular order.
-func (r *FileRepository) ListUnderPathInSnapshot(
-	ctx context.Context, path, snapshotID string,
-) ([]*File, error) {
-	path = strings.TrimRight(path, "/")
-	dirPrefix := path + "/"
-
-	query := `
-		SELECT f.id, f.path, f.source_path, f.mtime, f.mtime_nsec, f.size,
-			f.mode, f.uid, f.gid, f.link_target
-		FROM files f
-		JOIN snapshot_files sf ON sf.file_id = f.id
-		WHERE sf.snapshot_id = ?
-		  AND (f.path = ? OR substr(f.path, 1, length(?)) = ?)
-	`
-
-	rows, err := r.db.conn.QueryContext(ctx, query,
-		snapshotID, path, dirPrefix, dirPrefix)
-	if err != nil {
-		return nil, fmt.Errorf("querying files: %w", err)
-	}
-
-	defer func() { _ = rows.Close() }()
-
-	var files []*File
-
-	for rows.Next() {
-		file, err := r.scanFileRows(rows)
-		if err != nil {
-			return nil, fmt.Errorf("scanning file: %w", err)
-		}
-
-		files = append(files, file)
-	}
-
-	return files, rows.Err()
-}
-
 // ListIDsWithChunksNotInUploadedBlobs returns the IDs of the files whose
 // path starts with prefix and that list at least one chunk held by no
 // blob whose upload has completed (uploaded_ts set). A new snapshot

internal/database/files_test.go

@@ -212,65 +212,6 @@ func TestFileRepositoryListUnderPath(t *testing.T) {
 	}
 }
 
-// ListUnderPathInSnapshot leaves out files outside path and files the
-// snapshot does not list, though another snapshot lists them.
-func TestFileRepositoryListUnderPathInSnapshot(t *testing.T) {
-	t.Parallel()
-
-	db, cleanup := setupTestDB(t)
-	defer cleanup()
-
-	ctx := context.Background()
-	files := database.NewFileRepository(db)
-	snapshots := database.NewSnapshotRepository(db)
-
-	listed := map[string][]string{
-		"one": {"/src/a.txt", "/src2/c.txt"},
-		"two": {"/src/b.txt"},
-	}
-
-	for snapshotID, paths := range listed {
-		err := snapshots.Create(ctx, nil, &database.Snapshot{
-			ID:        types.SnapshotID(snapshotID),
-			Hostname:  "host",
-			StartedAt: time.Now(),
-		})
-		if err != nil {
-			t.Fatalf("failed to create snapshot %s: %v", snapshotID, err)
-		}
-
-		for _, path := range paths {
-			err := files.Create(ctx, nil, &database.File{
-				Path:  types.FilePath(path),
-				MTime: time.Now().Truncate(time.Second),
-				Mode:  0644,
-			})
-			if err != nil {
-				t.Fatalf("failed to create %s: %v", path, err)
-			}
-
-			err = snapshots.AddFile(ctx, nil, snapshotID, path)
-			if err != nil {
-				t.Fatalf("failed to add %s to %s: %v", path, snapshotID, err)
-			}
-		}
-	}
-
-	found, err := files.ListUnderPathInSnapshot(ctx, "/src", "one")
-	if err != nil {
-		t.Fatalf("failed to list files: %v", err)
-	}
-
-	got := make([]string, 0, len(found))
-	for _, f := range found {
-		got = append(got, f.Path.String())
-	}
-
-	if !slices.Equal(got, []string{"/src/a.txt"}) {
-		t.Errorf("got %q, want only /src/a.txt", got)
-	}
-}
-
 func TestFileRepositorySymlink(t *testing.T) {
 	t.Parallel()
 

internal/snapshot/module.go

@@ -16,9 +16,6 @@ type ScannerParams struct {
 	Fs             afero.Fs
 	Exclude        []string // Exclude patterns (combined global + snapshot-specific)
 	SkipErrors     bool     // Skip file read errors (log loudly but continue)
-	// PreviousSnapshotID is the most recent completed snapshot of the
-	// same name, "" for none.
-	PreviousSnapshotID string
 }
 
 // Module exports backup functionality as an fx module.
@@ -47,18 +44,17 @@ func provideScannerFactory(
 		}
 
 		return NewScanner(ScannerConfig{
-			FS:                 params.Fs,
-			ChunkSize:          cfg.ChunkSize.Int64(),
-			Repositories:       repos,
-			Storage:            storer,
-			MaxBlobSize:        cfg.BlobSizeLimit.Int64(),
-			CompressionLevel:   cfg.CompressionLevel,
-			AgeRecipients:      cfg.AgeRecipients,
-			EnableProgress:     params.EnableProgress,
-			UI:                 params.UI,
-			Exclude:            excludes,
-			SkipErrors:         params.SkipErrors,
-			PreviousSnapshotID: params.PreviousSnapshotID,
+			FS:               params.Fs,
+			ChunkSize:        cfg.ChunkSize.Int64(),
+			Repositories:     repos,
+			Storage:          storer,
+			MaxBlobSize:      cfg.BlobSizeLimit.Int64(),
+			CompressionLevel: cfg.CompressionLevel,
+			AgeRecipients:    cfg.AgeRecipients,
+			EnableProgress:   params.EnableProgress,
+			UI:               params.UI,
+			Exclude:          excludes,
+			SkipErrors:       params.SkipErrors,
 		})
 	}
 }

internal/snapshot/scanner.go

@@ -58,10 +58,6 @@ type Scanner struct {
 	compressionLevel int
 	ageRecipient     string
 	snapshotID       string // Current snapshot being processed
-	// previousSnapshotID is the most recent completed snapshot of the
-	// same name, "" for none. Only a file it lists can be counted as
-	// deleted.
-	previousSnapshotID string
 	// currentSourcePath is the source directory being scanned, stored with
 	// each file record.
 	currentSourcePath string
@@ -133,9 +129,6 @@ type ScannerConfig struct {
 	// SkipErrors skips files that cannot be opened or read (log loudly but
 	// continue); packer, database, encryption, and upload errors still abort.
 	SkipErrors bool
-	// PreviousSnapshotID is the most recent completed snapshot of the
-	// same name, "" for none.
-	PreviousSnapshotID string
 }
 
 // ScanResult contains the results of a scan operation. Files and bytes
@@ -214,7 +207,6 @@ func NewScanner(cfg ScannerConfig) *Scanner {
 		compiledExclude:    compiledExclude,
 		progress:           progress,
 		skipErrors:         cfg.SkipErrors,
-		previousSnapshotID: cfg.PreviousSnapshotID,
 		ui:                 uiw,
 		pendingChunkHashes: make(map[string]struct{}),
 	}
@@ -266,9 +258,8 @@ func (s *Scanner) Scan(
 
 	filesToProcess := scanResult.FilesToProcess
 
-	// Phase 1b: Detect deleted files by comparing the previous snapshot
-	// of this name against scanned files
-	err = s.detectDeletedFiles(ctx, path, existingFiles, result)
+	// Phase 1b: Detect deleted files by comparing DB against scanned files
+	err = s.detectDeletedFilesFromMap(ctx, knownFiles, existingFiles, result)
 	if err != nil {
 		return nil, fmt.Errorf("detecting deleted files: %w", err)
 	}
@@ -448,8 +439,9 @@ func (s *Scanner) summarizeScanPhase(
 }
 
 // loadKnownFiles loads the known files at and beneath path from the
-// database into a map for fast lookup. This avoids per-file database
-// queries during the scan phase.
+// database into a map for fast lookup. Every loaded file the scan does
+// not find is counted as deleted. This avoids per-file database queries
+// during the scan phase.
 func (s *Scanner) loadKnownFiles(
 	ctx context.Context, path string,
 ) (map[string]*database.File, error) {
@@ -1962,29 +1954,21 @@ func (s *Scanner) queueFileForBatchInsert(
 	})
 }
 
-// detectDeletedFiles counts as deleted each file at or beneath path that
-// the previous snapshot of this name lists, the walk did not find, and
-// is gone from disk. A file that is excluded, or inside an excluded
-// directory, is not counted: the walk skips it whether or not it is
-// still on disk.
-func (s *Scanner) detectDeletedFiles(
+// detectDeletedFilesFromMap finds files that existed in previous snapshots
+// but no longer exist. Uses pre-loaded maps to avoid any filesystem or
+// database access.
+func (s *Scanner) detectDeletedFilesFromMap(
 	ctx context.Context,
-	path string,
+	knownFiles map[string]*database.File,
 	existingFiles map[string]struct{},
 	result *ScanResult,
 ) error {
-	if s.previousSnapshotID == "" {
+	if len(knownFiles) == 0 {
 		return nil
 	}
 
-	previousFiles, err := s.repos.Files.ListUnderPathInSnapshot(
-		ctx, path, s.previousSnapshotID)
-	if err != nil {
-		return fmt.Errorf("listing files of snapshot %s: %w",
-			s.previousSnapshotID, err)
-	}
-
-	for _, file := range previousFiles {
+	// Check each known file against the enumerated set (no filesystem access needed)
+	for path, file := range knownFiles {
 		// Check context cancellation periodically
 		select {
 		case <-ctx.Done():
@@ -1992,22 +1976,13 @@ func (s *Scanner) detectDeletedFiles(
 		default:
 		}
 
-		filePath := file.Path.String()
-
-		_, exists := existingFiles[filePath]
-		if exists || s.excludedOrInExcludedDir(filePath, path) {
-			continue
+		// Check if the file exists in our enumerated set
+		if _, exists := existingFiles[path]; !exists {
+			// File has been deleted
+			result.FilesDeleted++
+			result.BytesDeleted += file.Size
+			log.Debug("Detected deleted file", "path", path, "size", file.Size)
 		}
-
-		// Under --skip-errors the walk also misses what it cannot reach,
-		// such as the files in a directory it cannot open.
-		if !s.goneFromDisk(filePath) {
-			continue
-		}
-
-		result.FilesDeleted++
-		result.BytesDeleted += file.Size
-		log.Debug("Detected deleted file", "path", filePath, "size", file.Size)
 	}
 
 	if result.FilesDeleted > 0 {
@@ -2018,34 +1993,6 @@ func (s *Scanner) detectDeletedFiles(
 	return nil
 }
 
-// excludedOrInExcludedDir reports whether filePath, which is at or
-// beneath rootPath, or any directory between rootPath and it, matches an
-// exclude pattern. A pattern such as */.local/share/Trash matches the
-// directory but not the files inside it, which the walk skips too.
-func (s *Scanner) excludedOrInExcludedDir(filePath, rootPath string) bool {
-	for p := filePath; len(p) > len(rootPath); p = filepath.Dir(p) {
-		if s.shouldExclude(p, rootPath) {
-			return true
-		}
-	}
-
-	return false
-}
-
-// goneFromDisk reports whether looking filePath up on disk finds that
-// it does not exist. Like the walk, it does not follow a symlink, so a
-// symlink whose target is gone is still on disk.
-func (s *Scanner) goneFromDisk(filePath string) bool {
-	var err error
-	if lstater, ok := s.fs.(afero.Lstater); ok {
-		_, _, err = lstater.LstatIfPossible(filePath)
-	} else {
-		_, err = s.fs.Stat(filePath)
-	}
-
-	return errors.Is(err, os.ErrNotExist)
-}
-
 // wrapPermissionError augments permission errors with platform-specific
 // remediation instructions. On macOS, TCC-protected directories (Calendars,
 // Reminders, Photos, etc.) return EPERM unless the running application has

internal/storage/file.go

@@ -120,10 +120,9 @@ func (f *FileStorer) Delete(_ context.Context, key string) error {
 	return nil
 }
 
-// List returns all keys with the given prefix, reading through symlinked
-// directories. It fails when the destination directory is missing, or
-// when the prefix or a directory above it is a symlink whose target is
-// missing; a prefix that is truly missing is an empty listing.
+// List returns all keys with the given prefix. It fails when the
+// destination directory is missing; a missing prefix under it is an
+// empty listing.
 func (f *FileStorer) List(ctx context.Context, prefix string) ([]string, error) {
 	var keys []string
 
@@ -134,7 +133,8 @@ func (f *FileStorer) List(ctx context.Context, prefix string) ([]string, error)
 
 	basePath := f.fullPath(prefix)
 
-	exists, err := f.prefixExists(prefix)
+	// Check if the prefix exists
+	exists, err := afero.Exists(f.fs, basePath)
 	if err != nil {
 		return nil, fmt.Errorf("checking path: %w", err)
 	}
@@ -143,7 +143,7 @@ func (f *FileStorer) List(ctx context.Context, prefix string) ([]string, error)
 		return keys, nil // Empty list for non-existent prefix
 	}
 
-	err = f.walk(basePath, func(path string, info os.FileInfo, err error) error {
+	err = afero.Walk(f.fs, basePath, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
@@ -176,9 +176,7 @@ func (f *FileStorer) List(ctx context.Context, prefix string) ([]string, error)
 }
 
 // ListStream returns a channel of ObjectInfo for large result sets. Like
-// List, it reads through symlinked directories and sends an error when
-// the destination directory is missing, or when the prefix or a directory
-// above it is a symlink whose target is missing.
+// List, it sends an error when the destination directory is missing.
 func (f *FileStorer) ListStream(ctx context.Context, prefix string) <-chan ObjectInfo {
 	ch := make(chan ObjectInfo)
 
@@ -194,7 +192,8 @@ func (f *FileStorer) ListStream(ctx context.Context, prefix string) <-chan Objec
 
 		basePath := f.fullPath(prefix)
 
-		exists, err := f.prefixExists(prefix)
+		// Check if the prefix exists
+		exists, err := afero.Exists(f.fs, basePath)
 		if err != nil {
 			ch <- ObjectInfo{Err: fmt.Errorf("checking path: %w", err)}
 
@@ -205,7 +204,7 @@ func (f *FileStorer) ListStream(ctx context.Context, prefix string) <-chan Objec
 			return // Empty channel for non-existent prefix
 		}
 
-		_ = f.walk(basePath, func(path string, info os.FileInfo, err error) error {
+		_ = afero.Walk(f.fs, basePath, func(path string, info os.FileInfo, err error) error {
 			// Check context cancellation
 			select {
 			case <-ctx.Done():
@@ -244,12 +243,11 @@ func (f *FileStorer) ListStream(ctx context.Context, prefix string) <-chan Objec
 }
 
 // DeletePartialUploads removes every file under prefix whose name ends in
-// tempSuffix. Like List, it reads through symlinked directories and fails
-// on one whose target is missing. A missing prefix has none to remove.
+// tempSuffix. A missing prefix has none to remove.
 func (f *FileStorer) DeletePartialUploads(ctx context.Context, prefix string) error {
 	basePath := f.fullPath(prefix)
 
-	exists, err := f.prefixExists(prefix)
+	exists, err := afero.Exists(f.fs, basePath)
 	if err != nil {
 		return fmt.Errorf("checking path: %w", err)
 	}
@@ -258,7 +256,7 @@ func (f *FileStorer) DeletePartialUploads(ctx context.Context, prefix string) er
 		return nil
 	}
 
-	err = f.walk(basePath, func(path string, info os.FileInfo, err error) error {
+	err = afero.Walk(f.fs, basePath, func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
@@ -354,54 +352,6 @@ func (f *FileStorer) writeAtomic(
 	return nil
 }
 
-// walk is afero.Walk, except that it reads through a symlinked directory
-// the way Get and Stat do, where afero.Walk reports the link as one file.
-// afero.Walk uses Lstat, which does not follow a link, whenever the
-// filesystem has one; the struct below carries only the afero.Fs methods,
-// so the walk uses Stat instead. A link back up the tree is followed until
-// the operating system refuses the path for too many levels of links, and
-// the walk then fails.
-func (f *FileStorer) walk(root string, fn filepath.WalkFunc) error {
-	return afero.Walk(struct{ afero.Fs }{f.fs}, root, fn)
-}
-
-// prefixExists reports whether prefix exists under the destination
-// directory. It checks each directory on the way down to prefix in turn,
-// and the first one Stat cannot find decides: if it is not there at all,
-// prefix is missing; if it is a symlink whose target is missing, such as
-// a link to a volume that is not mounted, prefixExists fails, since
-// listing it as empty would let prune delete every blob.
-func (f *FileStorer) prefixExists(prefix string) (bool, error) {
-	lstater, canLstat := f.fs.(afero.Lstater)
-	path := f.basePath
-
-	for name := range strings.SplitSeq(prefix, "/") {
-		path = filepath.Join(path, name)
-
-		_, err := f.fs.Stat(path)
-		if err == nil {
-			continue
-		}
-
-		if !os.IsNotExist(err) {
-			return false, err
-		}
-
-		// Lstat does not follow a symlink at path, so it finds the link
-		// that Stat could not follow.
-		if canLstat {
-			_, _, lstatErr := lstater.LstatIfPossible(path)
-			if lstatErr == nil {
-				return false, err
-			}
-		}
-
-		return false, nil
-	}
-
-	return true, nil
-}
-
 // fullPath returns the full filesystem path for a key.
 func (f *FileStorer) fullPath(key string) string {
 	return filepath.Join(f.basePath, key)

internal/storage/file_backend_test.go

@@ -4,10 +4,7 @@ import (
 	"context"
 	"errors"
 	"io/fs"
-	"os"
 	"path/filepath"
-	"reflect"
-	"strings"
 	"testing"
 
 	"sneak.berlin/go/vaultik/internal/storage"
@@ -63,232 +60,3 @@ func TestFileStorerListMissingDestination(t *testing.T) {
 		t.Errorf("ListStream error = %v, want a not-exist error", streamErr)
 	}
 }
-
-// The two directories at the top of a destination, either of which the
-// tests below replace with a symlink.
-const (
-	metadataDir = "metadata"
-	blobsDir    = "blobs"
-)
-
-// moveBehindSymlink moves base/dir to a directory elsewhere and puts a
-// symlink to it in its place.
-func moveBehindSymlink(t *testing.T, base, dir string) {
-	t.Helper()
-
-	linkPath := filepath.Join(base, dir)
-	movedPath := filepath.Join(t.TempDir(), dir)
-
-	err := os.Rename(linkPath, movedPath)
-	if err != nil {
-		t.Fatalf("moving %s away: %v", dir, err)
-	}
-
-	err = os.Symlink(movedPath, linkPath)
-	if err != nil {
-		t.Fatalf("linking %s: %v", dir, err)
-	}
-}
-
-// TestFileStorerListsThroughSymlinkedDirectory checks that List and
-// ListStream read through a symlinked metadata/ or blobs/ directory, as Get
-// and Stat do, instead of listing the link as one key. Listing the whole
-// destination meets the link part-way through the walk; listing its prefix
-// starts the walk at the link. A prefix missing behind the link lists as
-// empty.
-func TestFileStorerListsThroughSymlinkedDirectory(t *testing.T) {
-	t.Parallel()
-
-	for _, dir := range []string{metadataDir, blobsDir} {
-		t.Run(dir, func(t *testing.T) {
-			t.Parallel()
-
-			base := t.TempDir()
-			key := dir + "/aa/bb/object"
-
-			s, err := storage.NewFileStorer(base)
-			if err != nil {
-				t.Fatalf("NewFileStorer: %v", err)
-			}
-
-			err = s.Put(context.Background(), key, strings.NewReader("data"))
-			if err != nil {
-				t.Fatalf("Put: %v", err)
-			}
-
-			moveBehindSymlink(t, base, dir)
-
-			want := []string{key}
-
-			for _, prefix := range []string{"", dir + "/"} {
-				got := listSorted(t, s, prefix)
-				if !reflect.DeepEqual(got, want) {
-					t.Errorf("List(%q) = %v, want %v", prefix, got, want)
-				}
-
-				got = listStreamKeys(t, s, prefix)
-				if !reflect.DeepEqual(got, want) {
-					t.Errorf("ListStream(%q) = %v, want %v", prefix, got, want)
-				}
-			}
-
-			absent := dir + "/absent/"
-
-			if got := listSorted(t, s, absent); len(got) != 0 {
-				t.Errorf("List(%q) = %v, want empty", absent, got)
-			}
-
-			if got := listStreamKeys(t, s, absent); len(got) != 0 {
-				t.Errorf("ListStream(%q) = %v, want empty", absent, got)
-			}
-		})
-	}
-}
-
-// TestFileStorerListFailsOnSymlinkWithMissingTarget checks that List and
-// ListStream fail on a symlinked metadata/ or blobs/ directory whose target
-// is missing, such as a link to a volume that is not mounted, as they do on
-// a missing destination directory, instead of listing it as empty. That
-// holds for a prefix below the link too.
-func TestFileStorerListFailsOnSymlinkWithMissingTarget(t *testing.T) {
-	t.Parallel()
-
-	ctx := context.Background()
-
-	for _, dir := range []string{metadataDir, blobsDir} {
-		t.Run(dir, func(t *testing.T) {
-			t.Parallel()
-
-			base := t.TempDir()
-
-			s, err := storage.NewFileStorer(base)
-			if err != nil {
-				t.Fatalf("NewFileStorer: %v", err)
-			}
-
-			unmounted := filepath.Join(t.TempDir(), "unmounted")
-
-			err = os.Symlink(unmounted, filepath.Join(base, dir))
-			if err != nil {
-				t.Fatalf("Symlink: %v", err)
-			}
-
-			for _, prefix := range []string{"", dir + "/", dir + "/aa/"} {
-				keys, err := s.List(ctx, prefix)
-				if !errors.Is(err, fs.ErrNotExist) {
-					t.Errorf("List(%q) = %v, %v; want a not-exist error",
-						prefix, keys, err)
-				}
-
-				var streamErr error
-
-				for object := range s.ListStream(ctx, prefix) {
-					if object.Err != nil {
-						streamErr = object.Err
-					}
-				}
-
-				if !errors.Is(streamErr, fs.ErrNotExist) {
-					t.Errorf("ListStream(%q) error = %v, want a not-exist error",
-						prefix, streamErr)
-				}
-			}
-		})
-	}
-}
-
-// TestFileStorerListFailsOnSymlinkLoop checks that a symlink pointing back
-// at the destination makes List and ListStream fail instead of walking it
-// forever.
-func TestFileStorerListFailsOnSymlinkLoop(t *testing.T) {
-	t.Parallel()
-
-	ctx := context.Background()
-	base := t.TempDir()
-
-	s, err := storage.NewFileStorer(base)
-	if err != nil {
-		t.Fatalf("NewFileStorer: %v", err)
-	}
-
-	err = s.Put(ctx, testBlobKey, strings.NewReader("data"))
-	if err != nil {
-		t.Fatalf("Put: %v", err)
-	}
-
-	err = os.Symlink(base, filepath.Join(base, "blobs", "loop"))
-	if err != nil {
-		t.Fatalf("Symlink: %v", err)
-	}
-
-	keys, err := s.List(ctx, "blobs/")
-	if err == nil {
-		t.Errorf("List = %d keys and no error, want an error", len(keys))
-	}
-
-	var streamErr error
-
-	for object := range s.ListStream(ctx, "blobs/") {
-		if object.Err != nil {
-			streamErr = object.Err
-		}
-	}
-
-	if streamErr == nil {
-		t.Error("ListStream sent no error, want one")
-	}
-}
-
-// TestFileStorerDeletePartialUploadsThroughSymlinkedDirectory checks that
-// DeletePartialUploads, which remote nuke uses, removes a leftover temp
-// file behind a symlinked metadata/ or blobs/ directory and keeps the
-// object at the real key.
-func TestFileStorerDeletePartialUploadsThroughSymlinkedDirectory(t *testing.T) {
-	t.Parallel()
-
-	ctx := context.Background()
-
-	for _, dir := range []string{metadataDir, blobsDir} {
-		t.Run(dir, func(t *testing.T) {
-			t.Parallel()
-
-			base := t.TempDir()
-			key := dir + "/aa/bb/object"
-
-			s, err := storage.NewFileStorer(base)
-			if err != nil {
-				t.Fatalf("NewFileStorer: %v", err)
-			}
-
-			err = s.Put(ctx, key, strings.NewReader("data"))
-			if err != nil {
-				t.Fatalf("Put: %v", err)
-			}
-
-			leftover := filepath.Join(base, key+"-123456.partial")
-
-			err = os.WriteFile(leftover, []byte("half"), 0o600)
-			if err != nil {
-				t.Fatalf("writing leftover temp file: %v", err)
-			}
-
-			moveBehindSymlink(t, base, dir)
-
-			err = s.DeletePartialUploads(ctx, dir+"/")
-			if err != nil {
-				t.Fatalf("DeletePartialUploads: %v", err)
-			}
-
-			// leftover runs through the link.
-			_, err = os.Stat(leftover)
-			if !os.IsNotExist(err) {
-				t.Errorf("leftover temp file was not removed: %v", err)
-			}
-
-			_, err = s.Stat(ctx, key)
-			if err != nil {
-				t.Errorf("Stat of the real key: %v", err)
-			}
-		})
-	}
-}

internal/vaultik/fault_injection_test.go

@@ -661,18 +661,17 @@ func faultScannerFactory(
 ) snapshot.ScannerFactory {
 	return func(params snapshot.ScannerParams) *snapshot.Scanner {
 		return snapshot.NewScanner(snapshot.ScannerConfig{
-			FS:                 params.Fs,
-			Storage:            storer,
-			ChunkSize:          faultChunkSize,
-			MaxBlobSize:        faultMaxBlobSize,
-			CompressionLevel:   cfg.CompressionLevel,
-			AgeRecipients:      cfg.AgeRecipients,
-			Repositories:       repos,
-			EnableProgress:     params.EnableProgress,
-			UI:                 params.UI,
-			Exclude:            params.Exclude,
-			SkipErrors:         params.SkipErrors,
-			PreviousSnapshotID: params.PreviousSnapshotID,
+			FS:               params.Fs,
+			Storage:          storer,
+			ChunkSize:        faultChunkSize,
+			MaxBlobSize:      faultMaxBlobSize,
+			CompressionLevel: cfg.CompressionLevel,
+			AgeRecipients:    cfg.AgeRecipients,
+			Repositories:     repos,
+			EnableProgress:   params.EnableProgress,
+			UI:               params.UI,
+			Exclude:          params.Exclude,
+			SkipErrors:       params.SkipErrors,
 		})
 	}
 }

internal/vaultik/snapshot.go

@@ -243,18 +243,12 @@ func (v *Vaultik) createNamedSnapshot(
 		return err
 	}
 
-	previousSnapshotID, err := v.previousSnapshotID(snapName)
-	if err != nil {
-		return err
-	}
-
 	scanner := v.ScannerFactory(snapshot.ScannerParams{
-		EnableProgress:     !opts.Cron,
-		UI:                 v.UI,
-		Fs:                 v.Fs,
-		Exclude:            v.Config.GetExcludes(snapName),
-		SkipErrors:         opts.SkipErrors,
-		PreviousSnapshotID: previousSnapshotID,
+		EnableProgress: !opts.Cron,
+		UI:             v.UI,
+		Fs:             v.Fs,
+		Exclude:        v.Config.GetExcludes(snapName),
+		SkipErrors:     opts.SkipErrors,
 	})
 
 	snapshotID, err := v.SnapshotManager.CreateSnapshotWithName(
@@ -289,24 +283,6 @@ func (v *Vaultik) createNamedSnapshot(
 	return nil
 }
 
-// previousSnapshotID returns the ID of the most recent completed snapshot
-// named snapName in the local index, or "" when there is none.
-func (v *Vaultik) previousSnapshotID(snapName string) (string, error) {
-	snapshots, err := v.Repositories.Snapshots.ListRecent(v.ctx, listRecentLimit)
-	if err != nil {
-		return "", fmt.Errorf("listing snapshots: %w", err)
-	}
-
-	for _, s := range snapshots {
-		if s.CompletedAt != nil &&
-			parseSnapshotName(s.ID.String(), s.Hostname.String()) == snapName {
-			return s.ID.String(), nil
-		}
-	}
-
-	return "", nil
-}
-
 // resolveSnapshotPaths resolves source directories to absolute paths
 // with symlink resolution.
 func (v *Vaultik) resolveSnapshotPaths(snapName string) ([]string, error) {
@@ -651,7 +627,8 @@ func selectSnapshotsToPurge(
 }
 
 // confirmAndExecutePurge shows deletion candidates, confirms with the
-// user, and deletes snapshots.
+// user, and deletes snapshots. It stops with an error at the first
+// snapshot it cannot delete.
 func (v *Vaultik) confirmAndExecutePurge(
 	toDelete []SnapshotInfo, force, quiet bool,
 ) error {
@@ -693,10 +670,11 @@ func (v *Vaultik) confirmAndExecutePurge(
 		snapshotID := snap.ID.String()
 		log.Info("Deleting snapshot", "id", snapshotID)
 
+		// Stop before the remote delete: a snapshot still in the local
+		// index must keep its metadata on the destination store.
 		err := v.deleteSnapshotFromLocalDB(snapshotID)
 		if err != nil {
-			log.Error("Failed to delete from local database",
-				"snapshot_id", snapshotID, "error", err)
+			return fmt.Errorf("deleting snapshot %s from local index: %w", snapshotID, err)
 		}
 
 		_, err = v.deleteRemoteSnapshotByKey(snapshot.RemoteSnapshotKey(snapshotID))

internal/vaultik/snapshot_deleted_count_test.go

@@ -1,225 +0,0 @@
-package vaultik_test
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-	"testing"
-	"time"
-
-	"github.com/spf13/afero"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"sneak.berlin/go/vaultik/internal/config"
-	"sneak.berlin/go/vaultik/internal/database"
-	"sneak.berlin/go/vaultik/internal/log"
-	"sneak.berlin/go/vaultik/internal/storage"
-	"sneak.berlin/go/vaultik/internal/ui"
-	"sneak.berlin/go/vaultik/internal/vaultik"
-)
-
-// These tests cover https://git.eeqj.de/sneak/vaultik/issues/304: a
-// backup counts a file as deleted only when the previous snapshot of
-// the same name had it and it is gone, and never counts an excluded
-// file.
-
-// deletedCountEnv is a backup setup over the source directory src whose
-// user-facing output is kept in out. Each test configures its snapshots
-// with setSnapshot.
-type deletedCountEnv struct {
-	v   *vaultik.Vaultik
-	out *bytes.Buffer
-	src string
-}
-
-// newDeletedCountEnv writes files, keyed by path relative to src.
-func newDeletedCountEnv(t *testing.T, files map[string][]byte) *deletedCountEnv {
-	t.Helper()
-
-	ctx := context.Background()
-	fs := afero.NewOsFs()
-	tempDir := t.TempDir()
-	srcDir := filepath.Join(tempDir, "src")
-
-	for rel, content := range files {
-		path := filepath.Join(srcDir, rel)
-		require.NoError(t, fs.MkdirAll(filepath.Dir(path), 0o755))
-		require.NoError(t, afero.WriteFile(fs, path, content, 0o644))
-	}
-
-	cfg := faultTestConfig()
-	cfg.IndexPath = filepath.Join(tempDir, "index.sqlite")
-	cfg.Snapshots = map[string]config.SnapshotConfig{}
-
-	store, err := storage.NewFileStorer(filepath.Join(tempDir, "remote"))
-	require.NoError(t, err)
-
-	db, err := database.New(ctx, cfg.IndexPath)
-	require.NoError(t, err)
-	t.Cleanup(func() { _ = db.Close() })
-
-	repos := database.NewRepositories(db)
-	out := &bytes.Buffer{}
-	v := newBackupVaultik(ctx, cfg, store, repos, db, fs)
-	v.UI = ui.NewWithColor(out, false)
-
-	return &deletedCountEnv{v: v, out: out, src: srcDir}
-}
-
-// setSnapshot configures the snapshot name to back up the path rel
-// beneath src, with the given excludes.
-func (e *deletedCountEnv) setSnapshot(name, rel string, exclude ...string) {
-	e.v.Config.Snapshots[name] = config.SnapshotConfig{
-		Paths:   []string{filepath.Join(e.src, rel)},
-		Exclude: exclude,
-	}
-}
-
-// backUp runs a backup of the named snapshot and returns its output.
-func (e *deletedCountEnv) backUp(t *testing.T, name string) string {
-	t.Helper()
-
-	e.out.Reset()
-	require.NoError(t, e.v.CreateSnapshot(&vaultik.SnapshotCreateOptions{
-		Snapshots: []string{name},
-	}))
-
-	return e.out.String()
-}
-
-// A file this snapshot excludes is not counted as deleted: neither one
-// that another snapshot backs up, nor one that the previous snapshot of
-// this name had before the exclude was added.
-func TestBackupDoesNotCountExcludedFileAsDeleted(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	env := newDeletedCountEnv(t, map[string][]byte{
-		"top.txt":       []byte("top"),
-		"cache/tmp.bin": []byte("cache"),
-		"photos/a.jpg":  []byte("photo a"),
-		"photos/b.jpg":  []byte("photo b"),
-		"photos/c.jpg":  []byte("photo c"),
-	})
-	env.setSnapshot("photos", "photos")
-	env.setSnapshot("home", "", "/photos")
-
-	env.backUp(t, "photos")
-	assert.Contains(t, env.backUp(t, "home"), filesLine(2, 2, 0))
-
-	env.setSnapshot("home", "", "/photos", "/cache")
-	assert.Contains(t, env.backUp(t, "home"), filesLine(1, 0, 1))
-}
-
-// A file inside a directory that an exclude added after a backup
-// matches is not counted as deleted, though the pattern matches only the
-// directory.
-func TestBackupDoesNotCountFileInExcludedDirectoryAsDeleted(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	env := newDeletedCountEnv(t, map[string][]byte{
-		"top.txt":                         []byte("top"),
-		"user/.local/share/Trash/old.txt": []byte("old"),
-	})
-	env.setSnapshot("home", "")
-
-	assert.Contains(t, env.backUp(t, "home"), filesLine(2, 2, 0))
-
-	env.setSnapshot("home", "", "*/.local/share/Trash")
-	assert.Contains(t, env.backUp(t, "home"), filesLine(1, 0, 1))
-}
-
-// Under --skip-errors a file inside a directory that the walk cannot
-// open is not counted as deleted: it is still on disk.
-func TestBackupDoesNotCountFileInUnopenableDirectoryAsDeleted(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	env := newDeletedCountEnv(t, map[string][]byte{
-		"top.txt":           []byte("top"),
-		"locked/inside.txt": []byte("inside"),
-	})
-	env.setSnapshot("home", "")
-
-	assert.Contains(t, env.backUp(t, "home"), filesLine(2, 2, 0))
-
-	// A directory's mode does not lock out root, who runs the tests, so
-	// opening the directory is made to fail instead.
-	env.v.Fs = &openFailFs{
-		path: filepath.Join(env.src, "locked"),
-		err:  os.ErrPermission,
-	}
-
-	env.out.Reset()
-	require.NoError(t, env.v.CreateSnapshot(&vaultik.SnapshotCreateOptions{
-		SkipErrors: true,
-		Snapshots:  []string{"home"},
-	}))
-	assert.Contains(t, env.out.String(), filesLine(1, 0, 1))
-}
-
-// A backup counts only files that the previous snapshot of its own name
-// had, not one that a later snapshot of another name over the same path
-// had and that is since removed.
-func TestBackupIgnoresSnapshotOfAnotherName(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	env := newDeletedCountEnv(t, map[string][]byte{
-		"kept.txt": []byte("kept"),
-	})
-	env.setSnapshot("home", "")
-	env.setSnapshot("other", "")
-
-	env.backUp(t, "home")
-
-	// Snapshot start times are kept in whole seconds: wait so that other's
-	// snapshot is strictly the most recent.
-	time.Sleep(time.Second)
-
-	extra := filepath.Join(env.src, "extra.txt")
-	require.NoError(t, os.WriteFile(extra, []byte("extra"), 0o600))
-	env.backUp(t, "other")
-	require.NoError(t, os.Remove(extra))
-
-	assert.Contains(t, env.backUp(t, "home"), filesLine(1, 0, 1))
-}
-
-// A file removed from disk is counted as deleted by the next backup of
-// the snapshot that had it, and not by any later backup of that
-// snapshot, nor by the first backup of another name over the same path.
-func TestBackupCountsDeletedFileOnce(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	aContent := bytes.Repeat([]byte("a"), 1000)
-	bContent := bytes.Repeat([]byte("b"), 2000)
-	keptContent := bytes.Repeat([]byte("k"), 500)
-
-	env := newDeletedCountEnv(t, map[string][]byte{
-		"a.txt":    aContent,
-		"b.txt":    bContent,
-		"kept.txt": keptContent,
-	})
-	env.setSnapshot("home", "")
-	env.setSnapshot("other", "")
-
-	assert.Contains(t, env.backUp(t, "home"), filesLine(3, 3, 0))
-
-	require.NoError(t, os.Remove(filepath.Join(env.src, "a.txt")))
-	require.NoError(t, os.Remove(filepath.Join(env.src, "b.txt")))
-
-	summary := env.backUp(t, "home")
-	assert.Contains(t, summary,
-		"Files: 1 examined, 0 backed up, 1 unchanged, 2 deleted.")
-	assert.Contains(t, summary,
-		fmt.Sprintf("Data: %s total (%s backed up), %s deleted.",
-			env.v.UI.Size(int64(len(keptContent))), env.v.UI.Size(0),
-			env.v.UI.Size(int64(len(aContent)+len(bContent)))))
-
-	assert.Contains(t, env.backUp(t, "home"), filesLine(1, 0, 1))
-	assert.Contains(t, env.backUp(t, "other"), filesLine(1, 0, 1))
-}

internal/vaultik/symlinked_destination_test.go

@@ -1,147 +0,0 @@
-package vaultik_test
-
-import (
-	"context"
-	"io/fs"
-	"os"
-	"path/filepath"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"sneak.berlin/go/vaultik/internal/log"
-	"sneak.berlin/go/vaultik/internal/vaultik"
-)
-
-// TestPruneDeletesNothingThroughSymlinkedDirectory checks that prune keeps
-// every blob and the local snapshot record when the metadata/ or blobs/
-// directory of a file:// destination is a symlink to a directory elsewhere
-// (https://git.eeqj.de/sneak/vaultik/issues/296). A backup writes through
-// such a link, so prune has to list through it too.
-func TestPruneDeletesNothingThroughSymlinkedDirectory(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	for _, dir := range []string{"metadata", "blobs"} {
-		t.Run(dir, func(t *testing.T) {
-			t.Parallel()
-
-			ctx := context.Background()
-			storeDir := filepath.Join(t.TempDir(), "store")
-			v, repos, _ := backUpToFileDestination(ctx, t, storeDir)
-			blobFiles := blobFilesIn(t, storeDir)
-			moveBehindSymlink(t, storeDir, dir)
-
-			require.NoError(t, v.Prune(&vaultik.PruneOptions{Force: true}))
-
-			// When blobs/ is the link, these paths run through it.
-			for _, blobFile := range blobFiles {
-				assert.FileExists(t, blobFile, "prune must delete no blob")
-			}
-
-			snapshots, err := repos.Snapshots.ListRecent(ctx, listRecentTestLimit)
-			require.NoError(t, err)
-			assert.Len(t, snapshots, 1, "prune must delete no local snapshot record")
-		})
-	}
-}
-
-// TestPruneFailsOnSymlinkedDirectoryWithMissingTarget checks that prune
-// fails, deleting no blob and keeping the local snapshot record, when the
-// metadata/ or blobs/ directory of a file:// destination is a symlink
-// whose target is missing, as a link to a volume that is not mounted is.
-func TestPruneFailsOnSymlinkedDirectoryWithMissingTarget(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	for _, dir := range []string{"metadata", "blobs"} {
-		t.Run(dir, func(t *testing.T) {
-			t.Parallel()
-
-			ctx := context.Background()
-			storeDir := filepath.Join(t.TempDir(), "store")
-			v, repos, _ := backUpToFileDestination(ctx, t, storeDir)
-			blobFiles := blobFilesIn(t, storeDir)
-			targetPath := moveBehindSymlink(t, storeDir, dir)
-
-			// Unmount the volume the link points to, and mount it again
-			// once prune has run.
-			unmountedPath := targetPath + "-unmounted"
-			require.NoError(t, os.Rename(targetPath, unmountedPath))
-
-			err := v.Prune(&vaultik.PruneOptions{Force: true})
-			require.ErrorIs(t, err, fs.ErrNotExist)
-
-			require.NoError(t, os.Rename(unmountedPath, targetPath))
-
-			// When blobs/ is the link, these paths run through it.
-			for _, blobFile := range blobFiles {
-				assert.FileExists(t, blobFile, "prune must delete no blob")
-			}
-
-			snapshots, err := repos.Snapshots.ListRecent(ctx, listRecentTestLimit)
-			require.NoError(t, err)
-			assert.Len(t, snapshots, 1, "prune must delete no local snapshot record")
-		})
-	}
-}
-
-// TestRemoveSnapshotWarnsOnSymlinkedMetadataWithMissingTarget checks that
-// snapshot remove warns that the metadata could not be removed from the
-// destination when metadata/ is a symlink whose target is missing, as it
-// does when the destination directory is missing, instead of finding no
-// metadata to remove.
-func TestRemoveSnapshotWarnsOnSymlinkedMetadataWithMissingTarget(t *testing.T) {
-	log.Initialize(log.Config{})
-	t.Parallel()
-
-	ctx := context.Background()
-	storeDir := filepath.Join(t.TempDir(), "store")
-	v, repos, out := backUpToFileDestination(ctx, t, storeDir)
-	targetPath := moveBehindSymlink(t, storeDir, "metadata")
-	require.NoError(t, os.Rename(targetPath, targetPath+"-unmounted"))
-
-	result, err := v.RemoveSnapshot(localSnapshotID(ctx, t, repos, "first"),
-		&vaultik.RemoveOptions{Force: true})
-	require.NoError(t, err)
-
-	assert.False(t, result.RemoteRemoved)
-	assert.Contains(t, out.String(),
-		"Could not remove snapshot metadata from remote")
-	assert.NotContains(t, out.String(),
-		"Removed snapshot metadata from remote storage")
-}
-
-// blobFilesIn returns the paths of the blob files under storeDir/blobs, and
-// fails the test when there are none.
-func blobFilesIn(t *testing.T, storeDir string) []string {
-	t.Helper()
-
-	var blobFiles []string
-
-	err := filepath.WalkDir(filepath.Join(storeDir, "blobs"),
-		func(path string, entry fs.DirEntry, err error) error {
-			if err == nil && !entry.IsDir() {
-				blobFiles = append(blobFiles, path)
-			}
-
-			return err
-		})
-	require.NoError(t, err)
-	require.NotEmpty(t, blobFiles)
-
-	return blobFiles
-}
-
-// moveBehindSymlink moves storeDir/dir to a directory elsewhere, puts a
-// symlink to it in its place, and returns where it went.
-func moveBehindSymlink(t *testing.T, storeDir, dir string) string {
-	t.Helper()
-
-	linkPath := filepath.Join(storeDir, dir)
-	targetPath := filepath.Join(t.TempDir(), dir)
-	require.NoError(t, os.Rename(linkPath, targetPath))
-	require.NoError(t, os.Symlink(targetPath, linkPath))
-
-	return targetPath
-}