podman_image_info - Do not fail when nonexistant image name is provided (#57962)

* Account for older versions of Podman lacking 'exists'

changelogs/fragments/podman_image_facts-no-fail-on-invalid-image.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - podman_image_facts - do not fail if invalid or non-existant image name is provided (https://github.com/ansible/ansible/issues/57899)

lib/ansible/modules/cloud/podman/podman_image_info.py

@@ -154,20 +154,49 @@ import json
 from ansible.module_utils.basic import AnsibleModule
 
 
-def get_image_info(module, executable, name):
-
+def image_exists(module, executable, name):
+    command = [executable, 'image', 'exists', name]
+    rc, out, err = module.run_command(command)
+    if rc == 1:
+        return False
+    elif 'Command "exists" not found' in err:
+        # The 'exists' test is available in podman >= 0.12.1
+        command = [executable, 'image', 'ls', '-q', name]
+        rc2, out2, err2 = module.run_command(command)
+        if rc2 != 0:
+            return False
+    return True
+
+
+def filter_invalid_names(module, executable, name):
+    valid_names = []
+    names = name
     if not isinstance(name, list):
-        name = [name]
+        names = [name]
 
-    command = [executable, 'image', 'inspect']
-    command.extend(name)
+    for name in names:
+        if image_exists(module, executable, name):
+            valid_names.append(name)
 
-    rc, out, err = module.run_command(command)
+    return valid_names
 
-    if rc != 0:
-        module.fail_json(msg="Unable to gather info for '{0}': {1}".format(', '.join(name), err))
 
-    return out
+def get_image_info(module, executable, name):
+    names = name
+    if not isinstance(name, list):
+        names = [name]
+
+    if len(names) > 0:
+        command = [executable, 'image', 'inspect']
+        command.extend(names)
+        rc, out, err = module.run_command(command)
+
+        if rc != 0:
+            module.fail_json(msg="Unable to gather info for '{0}': {1}".format(', '.join(names), err))
+        return out
+
+    else:
+        return json.dumps([])
 
 
 def get_all_image_info(module, executable):
@@ -193,7 +222,8 @@ def main():
     executable = module.get_bin_path(executable, required=True)
 
     if name:
-        results = json.loads(get_image_info(module, executable, name))
+        valid_names = filter_invalid_names(module, executable, name)
+        results = json.loads(get_image_info(module, executable, valid_names))
     else:
         results = json.loads(get_all_image_info(module, executable))
 

test/integration/targets/podman_image_info/tasks/main.yml

@@ -24,3 +24,30 @@
           - all_image_result.images | length > 0
           - named_image_result.images | length == 1
           - "'dnsmasq' in named_image_result.images[0]['RepoTags'][0]"
+
+    - name: Get info on single image that does not exist
+      podman_image_info:
+        name: nope
+      register: single_nonexistant
+
+    - name: Get info on multiple images that do not exist
+      podman_image_info:
+        name:
+          - nope
+          - reallynope
+      register: multiple_nonexistant
+
+    - name: Get info with one image that does not exist
+      podman_image_info:
+        name:
+          - dnsmasq
+          - nope
+          - etcd
+      register: mixed_nonexistant
+
+    - name: Ensure image info was returned when non-existant image info was requisted
+      assert:
+        that:
+          - single_nonexistant.images | length == 0
+          - multiple_nonexistant.images | length == 0
+          - mixed_nonexistant.images | length == 2