image rm: allow for force-remove infra images

Force removal of images will also remove associated containers.
Historically, infra containers have been excluded resulting in
rather annoying errors, for instance, when running `rmi -af`.

Since there is not reasons to exclude infra containers, allow for
removing the entire pod when an infra image is force removed.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

libpod/runtime_img.go

@@ -36,10 +36,21 @@ func (r *Runtime) RemoveContainersForImageCallback(ctx context.Context) libimage
 			return err
 		}
 		for _, ctr := range ctrs {
-			if ctr.config.RootfsImageID == imageID {
-				var timeout *uint
+			if ctr.config.RootfsImageID != imageID {
+				continue
+			}
+			var timeout *uint
+			if ctr.config.IsInfra {
+				pod, err := r.state.Pod(ctr.config.Pod)
+				if err != nil {
+					return errors.Wrapf(err, "container %s is in pod %s, but pod cannot be retrieved", ctr.ID(), pod.ID())
+				}
+				if err := r.removePod(ctx, pod, true, true, timeout); err != nil {
+					return errors.Wrapf(err, "removing image %s: container %s using image could not be removed", imageID, ctr.ID())
+				}
+			} else {
 				if err := r.removeContainer(ctx, ctr, true, false, false, timeout); err != nil {
-					return errors.Wrapf(err, "error removing image %s: container %s using image could not be removed", imageID, ctr.ID())
+					return errors.Wrapf(err, "removing image %s: container %s using image could not be removed", imageID, ctr.ID())
 				}
 			}
 		}

test/system/010-images.bats

@@ -240,4 +240,64 @@ Labels.created_at | 20[0-9-]\\\+T[0-9:]\\\+Z
 
     run_podman rmi test:1.0
 }
+
+@test "podman images - rmi -af removes all containers and pods" {
+    pname=$(random_string)
+    run_podman create --pod new:$pname $IMAGE
+
+    run_podman inspect --format '{{.ID}}' $IMAGE
+    imageID=$output
+
+    run_podman version --format "{{.Server.Version}}-{{.Server.Built}}"
+    pauseImage=localhost/podman-pause:$output
+    run_podman inspect --format '{{.ID}}' $pauseImage
+    pauseID=$output
+
+    run_podman 2 rmi -a
+    is "$output" "Error: 2 errors occurred:
+.** Image used by .*: image is in use by a container
+.** Image used by .*: image is in use by a container"
+
+    run_podman rmi -af
+    is "$output" "Untagged: $IMAGE
+Untagged: $pauseImage
+Deleted: $imageID
+Deleted: $pauseID" "infra images gets removed as well"
+
+    run_podman images --noheading
+    is "$output" ""
+    run_podman ps --all --noheading
+    is "$output" ""
+    run_podman pod ps --noheading
+    is "$output" ""
+
+    run_podman create --pod new:$pname $IMAGE
+}
+
+@test "podman images - rmi -f can remove infra images" {
+    pname=$(random_string)
+    run_podman create --pod new:$pname $IMAGE
+
+    run_podman version --format "{{.Server.Version}}-{{.Server.Built}}"
+    pauseImage=localhost/podman-pause:$output
+    run_podman inspect --format '{{.ID}}' $pauseImage
+    pauseID=$output
+
+    run_podman 2 rmi $pauseImage
+    is "$output" "Error: Image used by .* image is in use by a container"
+
+    run_podman rmi -f $pauseImage
+    is "$output" "Untagged: $pauseImage
+Deleted: $pauseID"
+
+    # Force-removing the infra container removes the pod and all its containers.
+    run_podman ps --all --noheading
+    is "$output" ""
+    run_podman pod ps --noheading
+    is "$output" ""
+
+    # Other images are still present.
+    run_podman image exists $IMAGE
+}
+
 # vim: filetype=sh