Moves files

internal/backend/layout_s3legacy.go

@@ -0,0 +1,77 @@
+package backend
+
+import "restic"
+
+// S3LegacyLayout implements the old layout used for s3 cloud storage backends, as
+// described in the Design document.
+type S3LegacyLayout struct {
+	URL  string
+	Path string
+	Join func(...string) string
+}
+
+var s3LayoutPaths = map[restic.FileType]string{
+	restic.DataFile:     "data",
+	restic.SnapshotFile: "snapshot",
+	restic.IndexFile:    "index",
+	restic.LockFile:     "lock",
+	restic.KeyFile:      "key",
+}
+
+func (l *S3LegacyLayout) String() string {
+	return "<S3LegacyLayout>"
+}
+
+// Name returns the name for this layout.
+func (l *S3LegacyLayout) Name() string {
+	return "s3legacy"
+}
+
+// join calls Join with the first empty elements removed.
+func (l *S3LegacyLayout) join(url string, items ...string) string {
+	for len(items) > 0 && items[0] == "" {
+		items = items[1:]
+	}
+
+	path := l.Join(items...)
+	if path == "" || path[0] != '/' {
+		if url != "" && url[len(url)-1] != '/' {
+			url += "/"
+		}
+	}
+
+	return url + path
+}
+
+// Dirname returns the directory path for a given file type and name.
+func (l *S3LegacyLayout) Dirname(h restic.Handle) string {
+	if h.Type == restic.ConfigFile {
+		return l.URL + l.Join(l.Path, "/")
+	}
+
+	return l.join(l.URL, l.Path, s3LayoutPaths[h.Type]) + "/"
+}
+
+// Filename returns a path to a file, including its name.
+func (l *S3LegacyLayout) Filename(h restic.Handle) string {
+	name := h.Name
+
+	if h.Type == restic.ConfigFile {
+		name = "config"
+	}
+
+	return l.join(l.URL, l.Path, s3LayoutPaths[h.Type], name)
+}
+
+// Paths returns all directory names
+func (l *S3LegacyLayout) Paths() (dirs []string) {
+	for _, p := range s3LayoutPaths {
+		dirs = append(dirs, l.Join(l.Path, p))
+	}
+	return dirs
+}
+
+// Basedir returns the base dir name for type t.
+func (l *S3LegacyLayout) Basedir(t restic.FileType) string {
+	return l.Join(l.Path, s3LayoutPaths[t])
+}