cli: Add signature-policy flag to podman save

Allow overwrite of the signature-policy file
by passing signature-policy flag to podman save command

Closes: https://github.com/containers/podman/issues/15869
Signed-off-by: 😎Mostafa Emami <mustafaemami@gmail.com>

cmd/podman/images/save.go

@@ -96,6 +96,11 @@ func saveFlags(cmd *cobra.Command) {
 
 	flags.BoolVarP(&saveOpts.Quiet, "quiet", "q", false, "Suppress the output")
 	flags.BoolVarP(&saveOpts.MultiImageArchive, "multi-image-archive", "m", containerConfig.Engine.MultiImageArchive, "Interpret additional arguments as images not tags and create a multi-image-archive (only for docker-archive)")
+
+	if !registry.IsRemote() {
+		flags.StringVar(&saveOpts.SignaturePolicy, "signature-policy", "", "Path to a signature-policy file")
+		_ = flags.MarkHidden("signature-policy")
+	}
 }
 
 func save(cmd *cobra.Command, args []string) (finalErr error) {

pkg/domain/entities/images.go

@@ -335,7 +335,8 @@ type ImageSaveOptions struct {
 	// Output - write image to the specified path.
 	Output string
 	// Quiet - suppress output when copying images
-	Quiet bool
+	Quiet           bool
+	SignaturePolicy string
 }
 
 // ImageScpOptions provide options for securely copying images to and from a remote host

pkg/domain/infra/abi/images.go

@@ -406,6 +406,7 @@ func (ir *ImageEngine) Save(ctx context.Context, nameOrID string, tags []string,
 	saveOptions := &libimage.SaveOptions{}
 	saveOptions.DirForceCompress = options.Compress
 	saveOptions.OciAcceptUncompressedLayers = options.OciAcceptUncompressedLayers
+	saveOptions.SignaturePolicyPath = options.SignaturePolicy
 
 	// Force signature removal to preserve backwards compat.
 	// See https://github.com/containers/podman/pull/11669#issuecomment-925250264

test/e2e/save_test.go

@@ -46,6 +46,15 @@ var _ = Describe("Podman save", func() {
 		Expect(save).Should(Exit(0))
 	})
 
+	It("podman save signature-policy flag", func() {
+		SkipIfRemote("--signature-policy N/A for remote")
+		outfile := filepath.Join(podmanTest.TempDir, "alpine.tar")
+
+		save := podmanTest.Podman([]string{"save", "--signature-policy", "/etc/containers/policy.json", "-o", outfile, ALPINE})
+		save.WaitWithDefaultTimeout()
+		Expect(save).Should(Exit(0))
+	})
+
 	It("podman save oci flag", func() {
 		outfile := filepath.Join(podmanTest.TempDir, "alpine.tar")