Merge pull request opencontainers#43 from xiekeyang/shorthand

add version shorthand to commands

Author: xiekeyang

cmd/oci-create-runtime-bundle/main.go

@@ -87,8 +87,8 @@ func newBundleCmd(stdout, stderr *log.Logger) *cobra.Command {
 It is strongly recommended to keep the default value.`,
 	)
 
-	cmd.Flags().BoolVar(
-		&v.version, "version", false,
+	cmd.Flags().BoolVarP(
+		&v.version, "version", "v", false,
 		`Print version information and exit`,
 	)
 	return cmd

cmd/oci-image-validate/main.go

@@ -84,8 +84,8 @@ func newValidateCmd(stdout, stderr *log.Logger) *cobra.Command {
 		`A set of refs pointing to the manifests to be validated. Each reference must be present in the "refs" subdirectory of the image. Only applicable if type is image or imageLayout.`,
 	)
 
-	cmd.Flags().BoolVar(
-		&v.version, "version", false,
+	cmd.Flags().BoolVarP(
+		&v.version, "version", "v", false,
 		`Print version information and exit`,
 	)
 

cmd/oci-unpack/main.go

@@ -79,8 +79,9 @@ func newUnpackCmd(stdout, stderr *log.Logger) *cobra.Command {
 		&v.ref, "ref", "v1.0",
 		`The ref pointing to the manifest to be unpacked. This must be present in the "refs" subdirectory of the image.`,
 	)
-	cmd.Flags().BoolVar(
-		&v.version, "version", false,
+
+	cmd.Flags().BoolVarP(
+		&v.version, "version", "v", false,
 		`Print version information and exit`,
 	)
 	return cmd