lsjson, lsf: support showing the Tier of the object

cmd/lsf/lsf.go

@@ -70,6 +70,7 @@ output:
     o - Original ID of underlying object
     m - MimeType of object if known
     e - encrypted name
+    T - tier of storage if known, eg "Hot" or "Cool"
 
 So if you wanted the path, size and modification time, you would use
 --format "pst", or maybe --format "tsp" to put the path last.
@@ -191,6 +192,8 @@ func Lsf(fsrc fs.Fs, out io.Writer) error {
 		case 'o':
 			list.AddOrigID()
 			opt.ShowOrigIDs = true
+		case 'T':
+			list.AddTier()
 		default:
 			return errors.Errorf("Unknown format character %q", char)
 		}

fs/operations/lsjson.go

@@ -23,6 +23,7 @@ type ListJSONItem struct {
 	Hashes        map[string]string `json:",omitempty"`
 	ID            string            `json:",omitempty"`
 	OrigID        string            `json:",omitempty"`
+	Tier          string            `json:",omitempty"`
 }
 
 // Timestamp a time in the provided format
@@ -91,6 +92,7 @@ func ListJSON(fsrc fs.Fs, remote string, opt *ListJSONOpt, callback func(*ListJS
 			return errors.Wrap(err, "ListJSON failed to make new crypt remote")
 		}
 	}
+	canGetTier := fsrc.Features().GetTier
 	format := formatForPrecision(fsrc.Precision())
 	err := walk.ListR(fsrc, remote, false, ConfigMaxDepth(opt.Recurse), walk.ListAll, func(entries fs.DirEntries) (err error) {
 		for _, entry := range entries {
@@ -163,6 +165,11 @@ func ListJSON(fsrc fs.Fs, remote string, opt *ListJSONOpt, callback func(*ListJS
 						}
 					}
 				}
+				if canGetTier {
+					if do, ok := x.(fs.GetTierer); ok {
+						item.Tier = do.GetTier()
+					}
+				}
 			default:
 				fs.Errorf(nil, "Unknown type %T in listing in ListJSON", entry)
 			}

fs/operations/operations.go

@@ -1596,6 +1596,13 @@ func (l *ListFormat) AddOrigID() {
 	})
 }
 
+// AddTier adds file's Tier to the output if known
+func (l *ListFormat) AddTier() {
+	l.AppendOutput(func(entry *ListJSONItem) string {
+		return entry.Tier
+	})
+}
+
 // AddMimeType adds file's MimeType to the output if known
 func (l *ListFormat) AddMimeType() {
 	l.AppendOutput(func(entry *ListJSONItem) string {