pkg/fs: add sha224-xx...xx hint dir

And fix sha1 assumption for file name.

Fixes #1169

Change-Id: I2a907c6cf11631a4a86268a4dc393c64402b5d35

cmd/pk-mount/doc.go

@@ -35,6 +35,7 @@ Execute the following commands in a shell to mount a Perkeep directory in your h
   recent
   roots
   sha1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+  sha224-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   tag
 
 
@@ -70,10 +71,10 @@ The at directory contains full instructions in the README.txt file contained wit
 
 Accessing a specific Node
 
-You can directly access a specific directory by using the full sha1 identifier.
+You can directly access a specific directory by using the full sha224 identifier.
 
    cd ~/Perkeep
-   cd sha1-xxx # where xxx is the full 16 character identifier
+   cd sha224-xxx # where xxx is the full 56 character identifier
 
 
 Full Command Line Usage

pkg/fs/fs_test.go

@@ -217,7 +217,7 @@ func TestRoot(t *testing.T) {
 			t.Fatal(err)
 		}
 		sort.Strings(names)
-		want := []string{"WELCOME.txt", "at", "date", "recent", "roots", "sha1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "tag", "versions"}
+		want := []string{"WELCOME.txt", "at", "date", "recent", "roots", "sha1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "sha224-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "tag", "versions"}
 		if !reflect.DeepEqual(names, want) {
 			t.Errorf("root directory = %q; want %q", names, want)
 		}

pkg/fs/recent.go

@@ -119,7 +119,7 @@ func (n *recentDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 			if ext == "" && ccMeta.File != nil && strings.HasSuffix(ccMeta.File.MIMEType, "image/jpeg") {
 				ext = ".jpg"
 			}
-			name = strings.TrimPrefix(ccMeta.BlobRef.String(), "sha1-")[:10] + ext
+			name = strings.TrimPrefix(ccMeta.BlobRef.String(), ccMeta.BlobRef.HashName()+"-")[:10] + ext
 			if n.ents[name] != nil {
 				continue
 			}

pkg/fs/root.go

@@ -64,6 +64,7 @@ func (n *root) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 		{Name: "roots"},
 		{Name: "at"},
 		{Name: "sha1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"},
+		{Name: "sha224-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"},
 		{Name: "versions"},
 	}, nil
 }
@@ -123,6 +124,8 @@ func (n *root) Lookup(ctx context.Context, name string) (fs.Node, error) {
 		return n.getVersionsDir(), nil
 	case "sha1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx":
 		return notImplementDirNode{}, nil
+	case "sha224-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx":
+		return notImplementDirNode{}, nil
 	case ".camli_fs_stats":
 		return statsDir{}, nil
 	case "mach_kernel", ".hidden", "._.":