stages/bootc.install-to-filesystem: parametrize stateroot value

This adds an extra option to make the stateroot name customizable.

Fixes https://github.com/osbuild/osbuild/issues/2151

stages/org.osbuild.bootc.install-to-filesystem

@@ -43,6 +43,9 @@ def main(options, inputs, paths):
         target_imgref = options.get("target-imgref")
         if target_imgref:
             pargs.extend(["--target-imgref", target_imgref])
+        stateroot = options.get("stateroot")
+        if stateroot:
+            pargs.extend(["--stateroot", stateroot])
         # add target and go
         pargs.append(dst)
         subprocess.run(pargs, env=env, check=True)

stages/org.osbuild.bootc.install-to-filesystem.meta.json

@@ -7,16 +7,12 @@
     "mounted in the \"mounts\" path.",
     "Buildhost commands used: bootc"
   ],
-  "capabilities": [
+  "capabilities": ["CAP_MAC_ADMIN"],
-    "CAP_MAC_ADMIN"
-  ],
   "schema_2": {
     "inputs": {
       "type": "object",
       "additionalProperties": false,
-      "required": [
+      "required": ["images"],
-        "images"
-      ],
       "properties": {
         "images": {
           "type": "object",
@@ -44,6 +40,10 @@
         "target-imgref": {
           "description": "Specify the image to fetch for subsequent updates",
           "type": "string"
+        },
+        "stateroot": {
+          "type": "string",
+          "description": "The stateroot name to use. If not specified, defer to bootc's default"
         }
       }
     },