Bugfix: Backup changed data in incremental mode

cmd/restic/cmd_fsck.go

@@ -32,6 +32,7 @@ func init() {
 }
 
 func fsckFile(opts CmdFsck, s restic.Server, m *restic.Map, IDs []backend.ID) (uint64, error) {
+	debug.Log("restic.fsckFile", "checking file %v", IDs)
 	var bytes uint64
 
 	for _, id := range IDs {
@@ -44,6 +45,7 @@ func fsckFile(opts CmdFsck, s restic.Server, m *restic.Map, IDs []backend.ID) (u
 		}
 
 		bytes += blob.Size
+		debug.Log("restic.fsck", "  data blob found: %v\n", blob)
 
 		if opts.CheckData {
 			// load content
@@ -73,7 +75,7 @@ func fsckFile(opts CmdFsck, s restic.Server, m *restic.Map, IDs []backend.ID) (u
 }
 
 func fsckTree(opts CmdFsck, s restic.Server, blob restic.Blob) error {
-	debug.Log("restic.fsck", "checking tree %v\n", blob.ID)
+	debug.Log("restic.fsckTree", "checking tree %v", blob)
 
 	tree, err := restic.LoadTree(s, blob.Storage)
 	if err != nil {
@@ -102,10 +104,12 @@ func fsckTree(opts CmdFsck, s restic.Server, blob restic.Blob) error {
 		switch node.Type {
 		case "file":
 			if node.Content == nil {
+				debug.Log("restic.fsckTree", "file node %q of tree %v has no content: %v", node.Name, blob.ID, node)
 				return fmt.Errorf("file node %q of tree %v has no content: %v", node.Name, blob.ID, node)
 			}
 
 			if node.Content == nil && node.Error == "" {
+				debug.Log("restic.fsckTree", "file node %q of tree %v has no content", node.Name, blob.ID)
 				return fmt.Errorf("file node %q of tree %v has no content", node.Name, blob.ID)
 			}
 
@@ -114,12 +118,14 @@ func fsckTree(opts CmdFsck, s restic.Server, blob restic.Blob) error {
 				seenIDs.Insert(id)
 			}
 
+			debug.Log("restic.fsckTree", "check file %v (%v)", node.Name, blob.ID.Str())
 			bytes, err := fsckFile(opts, s, tree.Map, node.Content)
 			if err != nil {
 				return err
 			}
 
 			if bytes != node.Size {
+				debug.Log("restic.fsckTree", "file node %q of tree %v has size %d, but only %d bytes could be found", node.Name, blob, node.Size, bytes)
 				return fmt.Errorf("file node %q of tree %v has size %d, but only %d bytes could be found", node.Name, blob, node.Size, bytes)
 			}
 		case "dir":

node_linux.go

@@ -82,7 +82,7 @@ func (node *Node) isNewer(path string, fi os.FileInfo) bool {
 	tpe := nodeTypeFromFileInfo(path, fi)
 	if node.Name != fi.Name() || node.Type != tpe {
 		debug.Log("node.isNewer", "node %v is newer: name or type changed", path)
-		return false
+		return true
 	}
 
 	// collect extended stat
@@ -97,8 +97,8 @@ func (node *Node) isNewer(path string, fi os.FileInfo) bool {
 		node.ChangeTime != changeTime ||
 		node.Inode != inode ||
 		node.Size != size {
-		debug.Log("node.isNewer", "node %v is newer: timestamp or inode changed", path)
+		debug.Log("node.isNewer", "node %v is newer: timestamp, size or inode changed", path)
-		return false
+		return true
 	}
 
 	// otherwise the node is assumed to have the same content

testsuite/test-backup-incremental.sh

@@ -0,0 +1,28 @@
+set -e
+
+prepare
+run restic init
+
+# create testfile
+echo "testfile" > ${BASE}/fake-data/file
+
+# run first backup
+run restic backup "${BASE}/fake-data"
+
+# remember snapshot id
+SNAPSHOT=$(run restic list snapshots)
+
+# add data to testfile
+date >> ${BASE}/fake-data/file
+
+# run backup again
+run restic backup "${BASE}/fake-data"
+
+# add data to testfile
+date >> ${BASE}/fake-data/file
+
+# run incremental backup
+run restic backup -p "$SNAPSHOT" "${BASE}/fake-data"
+
+run restic fsck -o --check-data
+cleanup

testsuite/test-backup.sh

@@ -7,7 +7,7 @@ run restic restore "$(basename "$RESTIC_REPOSITORY"/snapshots/*)" "${BASE}/fake-
 dirdiff "${BASE}/fake-data" "${BASE}/fake-data-restore/fake-data"
 
 SNAPSHOT=$(run restic list snapshots)
-run restic backup "${BASE}/fake-data" $SNAPSHOT
+run restic backup -p "$SNAPSHOT" "${BASE}/fake-data"
 run restic restore "$(basename "$RESTIC_REPOSITORY"/snapshots/*)" "${BASE}/fake-data-restore-incremental"
 dirdiff "${BASE}/fake-data" "${BASE}/fake-data-restore-incremental/fake-data"