Fix podman image permissions issue and runlable test (#853)

Signed-off-by: Sagi Shnaidman <sshnaidm@redhat.com>

plugins/modules/podman_image.py

@@ -527,7 +527,7 @@ class PodmanImageManager(object):
         elif self.path and not build_file_arg:
             container_filename = self._find_containerfile_from_context()
 
-        if not containerfile_contents:
+        if not containerfile_contents and os.access(container_filename, os.R_OK):
             with open(container_filename) as f:
                 containerfile_contents = f.read()
 
@@ -538,6 +538,8 @@ class PodmanImageManager(object):
         When given the contents of a Containerfile/Dockerfile,
         return a sha256 hash of these contents.
         """
+        if not containerfile_contents:
+            return None
         return hashlib.sha256(
             containerfile_contents.encode(),
             usedforsecurity=False
@@ -551,7 +553,7 @@ class PodmanImageManager(object):
         If we don't have this, return an empty string.
         """
 
-        args_containerfile_hash = ""
+        args_containerfile_hash = None
 
         context_has_containerfile = self.path and self._find_containerfile_from_context()
 
@@ -581,9 +583,7 @@ class PodmanImageManager(object):
         else:
             digest_before = None
 
-        both_hashes_exist_and_differ = (
-            args_containerfile_hash != "" and
-            existing_image_containerfile_hash != "" and
+        both_hashes_exist_and_differ = (args_containerfile_hash and existing_image_containerfile_hash and
                                         args_containerfile_hash != existing_image_containerfile_hash
                                         )
 

tests/integration/targets/podman_runlabel/tasks/main.yml

@@ -4,6 +4,8 @@
     path: /tmp/usr_img
     state: directory
 
+- block:
+
     - name: Copy Dockerfile to container build directory
       copy:
         src: "{{ item }}"
@@ -46,3 +48,15 @@
     - name: Make sure install label exited with 128
       assert:
         that: install_runlabel.stdout == 'Installed.'
+  always:
+
+    - name: Remove the directory
+      file:
+        path: /tmp/usr_img
+        state: absent
+
+    - name: Remove the image
+      containers.podman.podman_image:
+        executable: "{{ test_executable | default('podman') }}"
+        name: "{{ runlabel_image }}"
+        state: absent