Add tests for rmi

Add integration test for removing by image id with tag and digest reference to the same repository.
Add integration test to ensure only tag to other repository remains after deleting tag with accompanying digest reference.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

integration-cli/docker_cli_by_digest_test.go

@@ -380,9 +380,14 @@ func (s *DockerRegistrySuite) TestDeleteImageByIDOnlyPulledByDigest(c *check.C)
 	dockerCmd(c, "pull", imageReference)
 	// just in case...
 
+	dockerCmd(c, "tag", imageReference, repoName+":sometag")
+
 	imageID := inspectField(c, imageReference, "Id")
 
 	dockerCmd(c, "rmi", imageID)
+
+	_, err = inspectFieldWithError(imageID, "Id")
+	c.Assert(err, checker.NotNil, check.Commentf("image should have been deleted"))
 }
 
 func (s *DockerRegistrySuite) TestDeleteImageWithDigestAndTag(c *check.C) {
@@ -412,6 +417,40 @@ func (s *DockerRegistrySuite) TestDeleteImageWithDigestAndTag(c *check.C) {
 	c.Assert(err, checker.NotNil, check.Commentf("image should have been deleted"))
 }
 
+func (s *DockerRegistrySuite) TestDeleteImageWithDigestAndMultiRepoTag(c *check.C) {
+	pushDigest, err := setupImage(c)
+	c.Assert(err, checker.IsNil, check.Commentf("error setting up image"))
+
+	repo2 := fmt.Sprintf("%s/%s", repoName, "repo2")
+
+	// pull from the registry using the <name>@<digest> reference
+	imageReference := fmt.Sprintf("%s@%s", repoName, pushDigest)
+	dockerCmd(c, "pull", imageReference)
+
+	imageID := inspectField(c, imageReference, "Id")
+
+	repoTag := repoName + ":sometag"
+	repoTag2 := repo2 + ":othertag"
+	dockerCmd(c, "tag", imageReference, repoTag)
+	dockerCmd(c, "tag", imageReference, repoTag2)
+
+	dockerCmd(c, "rmi", repoTag)
+
+	// rmi should have deleted repoTag and image reference, but left repoTag2
+	inspectField(c, repoTag2, "Id")
+	_, err = inspectFieldWithError(imageReference, "Id")
+	c.Assert(err, checker.NotNil, check.Commentf("image digest reference should have been removed"))
+
+	_, err = inspectFieldWithError(repoTag, "Id")
+	c.Assert(err, checker.NotNil, check.Commentf("image tag reference should have been removed"))
+
+	dockerCmd(c, "rmi", repoTag2)
+
+	// rmi should have deleted the tag, the digest reference, and the image itself
+	_, err = inspectFieldWithError(imageID, "Id")
+	c.Assert(err, checker.NotNil, check.Commentf("image should have been deleted"))
+}
+
 // TestPullFailsWithAlteredManifest tests that a `docker pull` fails when
 // we have modified a manifest blob and its digest cannot be verified.
 // This is the schema2 version of the test.