add error wrap for target

Signed-off-by: Xiaoxuan Wang <wangxiaoxuan119@gmail.com>

increase coverage

resolve comment

Signed-off-by: Xiaoxuan Wang <wangxiaoxuan119@gmail.com>

cmd/oras/internal/option/target.go

@@ -108,7 +108,7 @@ func (opts *Target) Parse() error {
 		opts.Type = TargetTypeRemote
 		if _, err := registry.ParseReference(opts.RawReference); err != nil {
 			return &oerrors.Error{
-				Err:            fmt.Errorf("%q is an invalid reference", opts.RawReference),
+				Err:            fmt.Errorf("%w: %q", err, opts.RawReference),
 				Recommendation: "Please make sure the provided reference is in the form of <registry>/<repo>[:tag|@digest]",
 			}
 		}

test/e2e/suite/command/push.go

@@ -51,7 +51,7 @@ var _ = Describe("ORAS beginners:", func() {
 
 		It("should fail if the provided reference is not valid", func() {
 			err := ORAS("push", "/oras").ExpectFailure().Exec().Err
-			gomega.Expect(err).Should(gbytes.Say(`Error: "/oras" is an invalid reference`))
+			gomega.Expect(err).Should(gbytes.Say(`Error: invalid reference: invalid registry "": "/oras" is an invalid reference`))
 			gomega.Expect(err).Should(gbytes.Say(regexp.QuoteMeta("Please make sure the provided reference is in the form of <registry>/<repo>[:tag|@digest]")))
 		})
 

test/e2e/suite/command/tag.go

@@ -36,6 +36,10 @@ var _ = Describe("ORAS beginners:", func() {
 			ORAS("tag", RegistryRef(ZOTHost, ImageRepo, InvalidTag), "tagged").ExpectFailure().MatchErrKeyWords(RegistryErrorPrefix).Exec()
 		})
 
+		It("should fail when the given reference is invalid", func() {
+			ORAS("tag", fmt.Sprintf("%s/%s:%s", ZOTHost, InvalidRepo, "test"), "latest").ExpectFailure().MatchErrKeyWords("Error:", "unable to add tag", "invalid reference").Exec()
+		})
+
 		It("should fail and show detailed error description if no argument provided", func() {
 			err := ORAS("tag").ExpectFailure().Exec().Err
 			gomega.Expect(err).Should(gbytes.Say("Error"))