stages/org.osbuild.wsl.conf: add stage to configure WSL settings

stages/org.osbuild.wsl.conf

@@ -0,0 +1,65 @@
+#!/usr/bin/python3
+"""
+Configure advanced settings in Windows Subsystem for Linux.
+
+The stage configures the WSL settings on the system.
+"""
+
+import sys
+
+import iniparse
+
+import osbuild.api
+
+SCHEMA = """
+"description": "WSL configuration.",
+"additionalProperties": false,
+"minProperties": 1,
+"properties": {
+  "boot": {
+    "type": "object",
+    "description": "Configures the [boot] section.",
+    "additionalProperties": false,
+    "minProperties": 1,
+    "properties": {
+      "systemd": {
+        "type": "boolean",
+        "default": false,
+        "description": "Enable systemd."
+      }
+    }
+  }
+}
+"""
+
+
+def main(tree, options):
+    boot = options.get("boot", {})
+    if not boot:
+        return 0
+
+    systemd = boot.get("systemd", False)
+    wsl_conf_path = f"{tree}/etc/wsl.conf"
+    wsl_config = iniparse.SafeConfigParser()
+
+    try:
+        with open(wsl_conf_path, "r", encoding="utf8") as f:
+            wsl_config.readfp(f)
+    except FileNotFoundError:
+        print(f"WSL configuration file '{wsl_conf_path}' does not exist, will be created.")
+
+    if not wsl_config.has_section("boot"):
+        wsl_config.add_section("boot")
+
+    wsl_config.set("boot", "systemd", (f"{systemd}").lower())
+
+    with open(wsl_conf_path, mode="w", encoding="utf8") as f:
+        wsl_config.write(f)
+
+    return 0
+
+
+if __name__ == '__main__':
+    args = osbuild.api.arguments()
+    r = main(args["tree"], args["options"])
+    sys.exit(r)