defconfig: Add script

Simple script for initializing the configuration from an existing
configuration file (usually a minimal configuration).

Just copying the minimal configuration to .config would usually work,
due to Kconfig semantics, but having it be a full configuration file
from the start might be handier and less confusing.

1 files changed, 43 insertions, 0 deletions

diff --git a/defconfig.py b/defconfig.py
new file mode 100755
index 0000000..7b02833
--- /dev/null
+++ b/defconfig.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2019, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+"""
+Reads a specified configuration file, then writes a new configuration file.
+This can be used to initialize the configuration from e.g. an arch-specific
+configuration file. This input configuration file would usually be a minimal
+configuration file, as generated by e.g. savedefconfig.
+
+The default output filename is '.config'. A different filename can be passed in
+the KCONFIG_CONFIG environment variable.
+"""
+import argparse
+
+import kconfiglib
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description=__doc__)
+
+    parser.add_argument(
+        "--kconfig",
+        default="Kconfig",
+        help="Base Kconfig file (default: Kconfig)")
+
+    parser.add_argument(
+        "config",
+        metavar="CONFIGURATION",
+        help="Input configuration file")
+
+    args = parser.parse_args()
+
+    kconf = kconfiglib.Kconfig(args.kconfig)
+    kconf.load_config(args.config)
+    kconf.write_config()
+
+
+if __name__ == "__main__":
+    main()