container: T6060: support removing all container images at once via op-mode

cpo@LR1.wue3:~$ show container image
REPOSITORY                    TAG         IMAGE ID      CREATED       SIZE
docker.io/library/busybox     latest      3f57d9401f8d  5 weeks ago   4.5 MB
docker.io/jacobalberty/unifi  v7.5        f6df690d6c67  4 months ago  827 MB
docker.io/jacobalberty/unifi  v7.4        7838b75ef7b9  7 months ago  786 MB

cpo@LR1.wue3:~$ delete container image
Possible completions:
  3f57d9401f8d          Delete container image
  7838b75ef7b9
  all
  f6df690d6c67

cpo@LR1.wue3:~$ delete container image all

cpo@LR1.wue3:~$ show container image
REPOSITORY  TAG         IMAGE ID    CREATED     SIZE

(cherry picked from commit 9e51a1661fac3e0d762cffdd28705e7e4bad76e9)

2 files changed, 8 insertions, 5 deletions

diff --git a/op-mode-definitions/container.xml.in b/op-mode-definitions/container.xml.in
index 96c582a83..4aa13e913 100644
--- a/op-mode-definitions/container.xml.in
+++ b/op-mode-definitions/container.xml.in
@@ -41,6 +41,7 @@
             <properties>
               <help>Delete container image</help>
               <completionHelp>
+                <list>all</list>
                 <script>sudo podman image ls -q</script>
               </completionHelp>
             </properties>
diff --git a/src/op_mode/container.py b/src/op_mode/container.py
index 385843b37..dcbb4dc55 100755
--- a/src/op_mode/container.py
+++ b/src/op_mode/container.py
@@ -31,7 +31,6 @@ def _get_json_data(command: str) -> list:
     """
     return cmd(f'{command} --format json')
 
-
 def _get_raw_data(command: str) -> list:
     json_data = _get_json_data(command)
     data = json.loads(json_data)
@@ -69,6 +68,13 @@ def add_image(name: str):
 def delete_image(name: str):
     from vyos.utils.process import rc_cmd
 
+    if name == 'all':
+        # gather list of all images and pass them to the removal list
+        name = cmd('sudo podman image ls --quiet')
+        # If there are no container images left, we can not delete them all
+        if not name: return
+        # replace newline with whitespace
+        name = name.replace('\n', ' ')
     rc, output = rc_cmd(f'podman image rm --force {name}')
     if rc != 0:
         raise vyos.opmode.InternalError(output)
@@ -81,7 +87,6 @@ def show_container(raw: bool):
     else:
         return cmd(command)
 
-
 def show_image(raw: bool):
     command = 'podman image ls'
     container_data = _get_raw_data('podman image ls')
@@ -90,7 +95,6 @@ def show_image(raw: bool):
     else:
         return cmd(command)
 
-
 def show_network(raw: bool):
     command = 'podman network ls'
     container_data = _get_raw_data(command)
@@ -99,7 +103,6 @@ def show_network(raw: bool):
     else:
         return cmd(command)
 
-
 def restart(name: str):
     from vyos.utils.process import rc_cmd
 
@@ -110,7 +113,6 @@ def restart(name: str):
     print(f'Container "{name}" restarted!')
     return output
 
-
 if __name__ == '__main__':
     try:
         res = vyos.opmode.run(sys.modules[__name__])