stages/logind: write only one drop-in file

Instead of supporting writing an arbitrary number of configuration
files, just write one. This makes the stage and its schema clearer
and simpler. If more than one config file is needed, the stage can
be repeated multiple times. It is also more flexible since we can
in the future specify additional options at the top level which
will then be per-file, like a top level comment.

stages/org.osbuild.systemd-logind

@@ -2,12 +2,9 @@
 """
 Configure systemd-logind
 
-The 'config' option allows to create one or more systemd-logind configuration
-drop-in files in `/usr/lib/systemd/logind.conf.d`. Value of this option is
-an dictionary with keys specifying the name od the `.conf` drop-in configuration
-file to create. The dictionary must have at least one `.conf` file defined.
-Value of each such key is dictionary representing the systemd-logind
-configuration.
+The 'config' option allows to create a systemd-logind configuration
+drop-in file in `/usr/lib/systemd/logind.conf.d` with the name
+`filename`.
 
 Drop-in configuration files can currently specify the following subset of
 options:
@@ -27,31 +24,29 @@ import osbuild.api
 
 SCHEMA = r"""
 "additionalProperties": false,
+"required": ["config", "filename"],
 "properties": {
+  "filename": {
+    "type": "string",
+    "description": "Name of the systemd-logind drop-in.",
+    "pattern": "^[\\w.-]{1,250}\\.conf$"
+  },
   "config": {
     "additionalProperties": false,
     "type": "object",
-    "description": "systemd-logind configuration drop-ins.",
+    "description": "systemd-logind configuration",
     "minProperties": 1,
-    "patternProperties": {
-      "^[\\w.-]{1,250}\\.conf$": {
+    "properties": {
+      "Login": {
         "additionalProperties": false,
         "type": "object",
-        "description": "Drop-in configuration for systemd-logind.",
-        "required": ["Login"],
+        "description": "'Login' configuration section.",
+        "minProperties": 1,
         "properties": {
-          "Login": {
-            "additionalProperties": false,
-            "type": "object",
-            "description": "'Login' configuration section.",
-            "minProperties": 1,
-            "properties": {
-              "NAutoVTs": {
-                "type": "integer",
-                "minimum": 0,
-                "description": "Configures how many virtual terminals (VTs) to allocate by default."
-              }
-            }
+          "NAutoVTs": {
+            "type": "integer",
+            "minimum": 0,
+            "description": "Configures how many virtual terminals (VTs) to allocate by default."
           }
         }
       }
@@ -61,32 +56,25 @@ SCHEMA = r"""
 """
 
 
-def create_configuration_dropins(tree, configuration_dropins_options):
-    if not configuration_dropins_options:
-        return
+def main(tree, options):
+    dropin_file = options["filename"]
+    dropin_config = options["config"]
 
     dropins_dir = f"{tree}/usr/lib/systemd/logind.conf.d"
     os.makedirs(dropins_dir, exist_ok=True)
 
-    for dropin_file, dropin_config in configuration_dropins_options.items():
-        config = configparser.ConfigParser()
-        # prevent conversion of the option name to lowercase
-        config.optionxform = lambda option: option
+    config = configparser.ConfigParser()
+    # prevent conversion of the option name to lowercase
+    config.optionxform = lambda option: option
 
-        for section, options in dropin_config.items():
-            if not config.has_section(section):
-                config.add_section(section)
-            for option, value in options.items():
-                config.set(section, option, str(value))
+    for section, opts in dropin_config.items():
+        if not config.has_section(section):
+            config.add_section(section)
+        for option, value in opts.items():
+            config.set(section, option, str(value))
 
-        with open(f"{dropins_dir}/{dropin_file}", "w") as f:
-            config.write(f, space_around_delimiters=False)
-
-
-def main(tree, options):
-    configuration_dropins_options = options.get("config", {})
-
-    create_configuration_dropins(tree, configuration_dropins_options)
+    with open(f"{dropins_dir}/{dropin_file}", "w") as f:
+        config.write(f, space_around_delimiters=False)
 
     return 0
 

test/data/stages/systemd-logind/b.json

@@ -457,11 +457,10 @@
       {
         "name": "org.osbuild.systemd-logind",
         "options": {
+          "filename": "10-ec2-getty-fix.conf",
           "config": {
-            "10-ec2-getty-fix.conf": {
-              "Login": {
-                "NAutoVTs": 0
-              }
+            "Login": {
+              "NAutoVTs": 0
             }
           }
         }

test/data/stages/systemd-logind/b.mpp.json

@@ -32,11 +32,10 @@
       {
         "name": "org.osbuild.systemd-logind",
         "options": {
+          "filename": "10-ec2-getty-fix.conf",
           "config": {
-            "10-ec2-getty-fix.conf": {
-              "Login": {
-                "NAutoVTs": 0
-              }
+            "Login": {
+              "NAutoVTs": 0
             }
           }
         }