container: T4014: Add `command`, `arg` and `entrypoint` configuration options for containers

(cherry picked from commit 53aebddb4ca54b0cc4a296d6cc4c4d960c5f1d73)

2 files changed, 45 insertions, 3 deletions

diff --git a/interface-definitions/container.xml.in b/interface-definitions/container.xml.in
index 1c971b58a..479f13355 100644
--- a/interface-definitions/container.xml.in
+++ b/interface-definitions/container.xml.in
@@ -104,11 +104,38 @@
               </leafNode>
             </children>
           </tagNode>
+          <leafNode name="entrypoint">
+            <properties>
+              <help>Override the default ENTRYPOINT from the image</help>
+              <constraint>
+                <regex>[ !#-%&amp;(-~]+</regex>
+              </constraint>
+              <constraintErrorMessage>Entrypoint must be ascii characters, use &amp;quot; and &amp;apos for double and single quotes respectively</constraintErrorMessage>
+            </properties>
+          </leafNode>
           <leafNode name="image">
             <properties>
               <help>Image name in the hub-registry</help>
             </properties>
           </leafNode>
+          <leafNode name="command">
+            <properties>
+              <help>Override the default CMD from the image</help>
+              <constraint>
+                <regex>[ !#-%&amp;(-~]+</regex>
+              </constraint>
+              <constraintErrorMessage>Command must be ascii characters, use &amp;quot; and &amp;apos for double and single quotes respectively</constraintErrorMessage>
+            </properties>
+          </leafNode>
+          <leafNode name="arguments">
+            <properties>
+              <help>The command's arguments for this container</help>
+              <constraint>
+                <regex>[ !#-%&amp;(-~]+</regex>
+              </constraint>
+              <constraintErrorMessage>The command's arguments must be ascii characters, use &amp;quot; and &amp;apos for double and single quotes respectively</constraintErrorMessage>
+            </properties>
+          </leafNode>
           <leafNode name="memory">
             <properties>
               <help>Memory (RAM) available to this container (default: 512)</help>
diff --git a/src/conf_mode/container.py b/src/conf_mode/container.py
index 90e5f84f2..4f93c93a1 100755
--- a/src/conf_mode/container.py
+++ b/src/conf_mode/container.py
@@ -279,8 +279,22 @@ def generate_run_arguments(name, container_config):
                          f'--memory {memory}m --shm-size {shared_memory}m --memory-swap 0 --restart {restart} ' \
                          f'--name {name} {device} {port} {volume} {env_opt}'
 
+    entrypoint = ''
+    if 'entrypoint' in container_config:
+        # it needs to be json-formatted with single quote on the outside
+        entrypoint = json_write(container_config['entrypoint'].split()).replace('"', "&quot;")
+        entrypoint = f'--entrypoint &apos;{entrypoint}&apos;'
+
+    command = ''
+    if 'command' in container_config:
+        command = container_config['command'].strip()
+
+    command_arguments = ''
+    if 'arguments' in container_config:
+        command_arguments = container_config['arguments'].strip()
+
     if 'allow_host_networks' in container_config:
-        return f'{container_base_cmd} --net host {image}'
+        return f'{container_base_cmd} --net host {entrypoint} {image} {command} {command_arguments}'.strip()
 
     ip_param = ''
     networks = ",".join(container_config['network'])
@@ -289,7 +303,7 @@ def generate_run_arguments(name, container_config):
             address = container_config['network'][network]['address']
             ip_param = f'--ip {address}'
 
-    return f'{container_base_cmd} --net {networks} {ip_param} {image}'
+    return f'{container_base_cmd} --net {networks} {ip_param} {entrypoint} {image} {command} {command_arguments}'.strip()
 
 def generate(container):
     # bail out early - looks like removal from running config
@@ -341,7 +355,8 @@ def generate(container):
 
             file_path = os.path.join(systemd_unit_path, f'vyos-container-{name}.service')
             run_args = generate_run_arguments(name, container_config)
-            render(file_path, 'container/systemd-unit.j2', {'name': name, 'run_args': run_args})
+            render(file_path, 'container/systemd-unit.j2', {'name': name, 'run_args': run_args,},
+                   formater=lambda _: _.replace("&quot;", '"').replace("&apos;", "'"))
 
     return None