Wrap the Store.Names() method in the CLI

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

cmd/containers-storage/name.go

@@ -10,6 +10,30 @@ import (
 	"github.com/containers/storage/pkg/mflag"
 )
 
+func getNames(flags *mflag.FlagSet, action string, m storage.Store, args []string) int {
+	if len(args) < 1 {
+		return 1
+	}
+	id, err := m.Lookup(args[0])
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return 1
+	}
+	names, err := m.Names(id)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		return 1
+	}
+	if jsonOutput {
+		json.NewEncoder(os.Stdout).Encode(append([]string{}, names...))
+	} else {
+		for _, name := range names {
+			fmt.Printf("%s\n", name)
+		}
+	}
+	return 0
+}
+
 func addNames(flags *mflag.FlagSet, action string, m storage.Store, args []string) int {
 	if len(args) < 1 {
 		return 1
@@ -71,6 +95,16 @@ func setNames(flags *mflag.FlagSet, action string, m storage.Store, args []strin
 }
 
 func init() {
+	commands = append(commands, command{
+		names:       []string{"get-names", "getnames"},
+		optionsHelp: "[options [...]] imageOrContainerNameOrID",
+		usage:       "Get layer, image, or container name or names",
+		minArgs:     1,
+		action:      getNames,
+		addFlags: func(flags *mflag.FlagSet, cmd *command) {
+			flags.BoolVar(&jsonOutput, []string{"-json", "j"}, jsonOutput, "Prefer JSON output")
+		},
+	})
 	commands = append(commands, command{
 		names:       []string{"add-names", "addnames"},
 		optionsHelp: "[options [...]] imageOrContainerNameOrID",

docs/containers-storage-add-names.md

@@ -22,4 +22,5 @@ other layer, image, or container.
 **containers-storage add-names -n my-awesome-container -n my-for-realsies-awesome-container f3be6c6134d0d980936b4c894f1613b69a62b79588fdeda744d0be3693bde8ec**
 
 ## SEE ALSO
+containers-storage-get-names(1)
 containers-storage-set-names(1)

docs/containers-storage-get-names.md

@@ -0,0 +1,21 @@
+## containers-storage-get-names 1 "September 2017"
+
+## NAME
+containers-storage get-names - Get names of a layer/image/container
+
+## SYNOPSIS
+**containers-storage** **get-names** *layerOrImageOrContainerNameOrID*
+
+## DESCRIPTION
+In addition to IDs, *layers*, *images*, and *containers* can have
+human-readable names assigned to them in *containers-storage*.  The *get-names*
+command can be used to read the list of names for any of them.
+
+## OPTIONS
+
+## EXAMPLE
+**containers-storage get-names f3be6c6134d0d980936b4c894f1613b69a62b79588fdeda744d0be3693bde8ec**
+
+## SEE ALSO
+containers-storage-add-names(1)
+containers-storage-set-names(1)

docs/containers-storage-set-names.md

@@ -25,3 +25,4 @@ will be removed from the layer, image, or container.
 
 ## SEE ALSO
 containers-storage-add-names(1)
+containers-storage-get-names(1)