stages: add support for kernel-options to bootc-install-to-fs

This commit adds support to use the `--kopt` arguments to
`bootc install to-filesystems`. It is not strictly needed right
now though.

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

@@ -40,6 +40,13 @@ SCHEMA_2 = r"""
         "type": "string"
       }
     },
+    "kernel-args": {
+      "description": "array of additional kernel arguments",
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    }
   }
 },
 "devices": {
@@ -70,6 +77,9 @@ def main(options, inputs, paths):
                 tmpf.write(key.encode("utf8") + b"\n")
             tmpf.flush()
             pargs.extend(["--root-ssh-authorized-keys", tmpf.name])
+        # customize kernel-args
+        for karg in options.get("kernel-args", []):
+            pargs.extend(["--karg", karg])
         # add target and go
         pargs.append(dst)
         subprocess.run(pargs, check=True)

stages/test/test_bootc_install_to_fs.py

@@ -43,9 +43,20 @@ FAKE_INPUTS = {
 
 @pytest.mark.parametrize("options,expected_args", [
     ({}, []),
+    # root-ssh
     ({"root-ssh-authorized-keys": []}, []),
     ({"root-ssh-authorized-keys": ["ssh-key"]}, ["--root-ssh-authorized-keys", "/tmp/fake-named-tmpfile-name"]),
     ({"root-ssh-authorized-keys": ["key1", "key2"]}, ["--root-ssh-authorized-keys", "/tmp/fake-named-tmpfile-name"]),
+    # kernel args
+    ({"kernel-args": []}, []),
+    ({"kernel-args": ["console=ttyS0"]}, ["--karg", "console=ttyS0"]),
+    ({"kernel-args": ["arg1", "arg2"]}, ["--karg", "arg1", "--karg", "arg2"]),
+    # all
+    ({"root-ssh-authorized-keys": ["key1", "key2"],
+      "kernel-args": ["arg1", "arg2"]},
+     ["--root-ssh-authorized-keys", "/tmp/fake-named-tmpfile-name",
+      "--karg", "arg1", "--karg", "arg2"],
+     ),
 ])
 @patch("subprocess.run")
 def test_bootc_install_to_fs(mock_run, mocked_named_tmp, mocked_temp_dir, stage_module, options, expected_args):  # pylint: disable=unused-argument