confd: add support for upgrade action (rpc)

Already supported in the CLI.  This makes it official, and quite handy
for users that run mutable containers.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/confd/src/infix-containers.c

@@ -492,6 +492,7 @@ int infix_containers_init(struct confd *confd)
 	REGISTER_RPC(confd->session, CFG_XPATH "/container/start",   action, NULL, &confd->sub);
 	REGISTER_RPC(confd->session, CFG_XPATH "/container/stop",    action, NULL, &confd->sub);
 	REGISTER_RPC(confd->session, CFG_XPATH "/container/restart", action, NULL, &confd->sub);
+	REGISTER_RPC(confd->session, CFG_XPATH "/container/upgrade", action, NULL, &confd->sub);
 	REGISTER_RPC(confd->session, "/infix-containers:oci-load", oci_load, NULL, &confd->sub);
 
 	return SR_ERR_OK;

src/confd/yang/confd/infix-containers.yang

@@ -22,8 +22,10 @@ module infix-containers {
     prefix infix-sys;
   }
 
-  revision 2025-09-09 {
-    description "Add dedicated 'ident' type for container and volume names.";
+  revision 2025-10-12 {
+    description "Two major changes:
+                  - Add dedicated 'ident' type for container and volume names.
+                  - New upgrade action (RPC) for containers with :latest image.";
     reference "internal";
   }
 
@@ -484,6 +486,18 @@ module infix-containers {
       action restart {
         description "Restart a running, or start, a stopped container.";
       }
+
+      action upgrade {
+        description "Upgrade container to latest version of its image.
+
+                     This action fetches the latest version of the container's image
+                     and recreates the container with the new image. Any named volumes
+                     are preserved.
+
+                     Note: This action is primarily for containers using mutable tags
+                           like ':latest'.  For containers using immutable tags (e.g.,
+                           ':25.06.0'), the upgrade action will have no effect.";
+      }
     }
   }
 

src/confd/yang/containers.inc

@@ -1,5 +1,5 @@
 # -*- sh -*-
 MODULES=(
     "infix-interfaces -e containers"
-    "infix-containers@2025-09-09.yang"
+    "infix-containers@2025-10-12.yang"
 )