Fix image prune --filter cmd behavior

Image prune --filter is fully implemented in the api, http api
yet not connected with the cli execution. User trying to use
filters does not see the effect. This commit adds glue code to enable
possiblity of using --filter in prune in the cli execution.

Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>

cmd/podman/images/prune.go

@@ -59,7 +59,15 @@ func prune(cmd *cobra.Command, args []string) error {
 			return nil
 		}
 	}
-
+	filterMap, err := common.ParseFilters(filter)
+	if err != nil {
+		return err
+	}
+	for k, v := range filterMap {
+		for _, val := range v {
+			pruneOpts.Filter = append(pruneOpts.Filter, fmt.Sprintf("%s=%s", k, val))
+		}
+	}
 	results, err := registry.ImageEngine().Prune(registry.GetContext(), pruneOpts)
 	if err != nil {
 		return err

test/e2e/common_test.go

@@ -451,19 +451,13 @@ func (p *PodmanTestIntegration) RunLsContainerInPod(name, pod string) (*PodmanSe
 // BuildImage uses podman build and buildah to build an image
 // called imageName based on a string dockerfile
 func (p *PodmanTestIntegration) BuildImage(dockerfile, imageName string, layers string) string {
-	dockerfilePath := filepath.Join(p.TempDir, "Dockerfile")
-	err := ioutil.WriteFile(dockerfilePath, []byte(dockerfile), 0755)
-	Expect(err).To(BeNil())
-	cmd := []string{"build", "--pull-never", "--layers=" + layers, "--file", dockerfilePath}
-	if len(imageName) > 0 {
-		cmd = append(cmd, []string{"-t", imageName}...)
-	}
-	cmd = append(cmd, p.TempDir)
-	session := p.Podman(cmd)
-	session.Wait(240)
-	Expect(session).Should(Exit(0), fmt.Sprintf("BuildImage session output: %q", session.OutputToString()))
-	output := session.OutputToStringArray()
-	return output[len(output)-1]
+	return p.buildImage(dockerfile, imageName, layers, "")
+}
+
+// BuildImageWithLabel uses podman build and buildah to build an image
+// called imageName based on a string dockerfile, adds desired label to paramset
+func (p *PodmanTestIntegration) BuildImageWithLabel(dockerfile, imageName string, layers string, label string) string {
+	return p.buildImage(dockerfile, imageName, layers, label)
 }
 
 // PodmanPID execs podman and returns its PID
@@ -828,3 +822,22 @@ func (p *PodmanSessionIntegration) jq(jqCommand string) (string, error) {
 	err := cmd.Run()
 	return strings.TrimRight(out.String(), "\n"), err
 }
+
+func (p *PodmanTestIntegration) buildImage(dockerfile, imageName string, layers string, label string) string {
+	dockerfilePath := filepath.Join(p.TempDir, "Dockerfile")
+	err := ioutil.WriteFile(dockerfilePath, []byte(dockerfile), 0755)
+	Expect(err).To(BeNil())
+	cmd := []string{"build", "--pull-never", "--layers=" + layers, "--file", dockerfilePath}
+	if label != "" {
+		cmd = append(cmd, "--label="+label)
+	}
+	if len(imageName) > 0 {
+		cmd = append(cmd, []string{"-t", imageName}...)
+	}
+	cmd = append(cmd, p.TempDir)
+	session := p.Podman(cmd)
+	session.Wait(240)
+	Expect(session).Should(Exit(0), fmt.Sprintf("BuildImage session output: %q", session.OutputToString()))
+	output := session.OutputToStringArray()
+	return output[len(output)-1]
+}

test/e2e/images_test.go

@@ -425,4 +425,25 @@ LABEL "com.example.vendor"="Example Vendor"
 		Expect(result.OutputToStringArray()).To(Not(Equal(result1.OutputToStringArray())))
 	})
 
+	It("podman image prune --filter", func() {
+		dockerfile := `FROM quay.io/libpod/alpine:latest
+RUN > file
+`
+		dockerfile2 := `FROM quay.io/libpod/alpine:latest
+RUN > file2
+`
+		podmanTest.BuildImageWithLabel(dockerfile, "foobar.com/workdir:latest", "false", "abc")
+		podmanTest.BuildImageWithLabel(dockerfile2, "foobar.com/workdir:latest", "false", "xyz")
+		// --force used to to avoid y/n question
+		result := podmanTest.Podman([]string{"image", "prune", "--filter", "label=abc", "--force"})
+		result.WaitWithDefaultTimeout()
+		Expect(result).Should(Exit(0))
+		Expect(len(result.OutputToStringArray())).To(Equal(1))
+
+		//check if really abc is removed
+		result = podmanTest.Podman([]string{"image", "list", "--filter", "label=abc"})
+		Expect(len(result.OutputToStringArray())).To(Equal(0))
+
+	})
+
 })