savedefconfig: Add script

Minimal configuration files can already be generated from within the
menuconfig too, but having a script available can be handy for
scripting.

1 files changed, 47 insertions, 0 deletions

diff --git a/savedefconfig.py b/savedefconfig.py
new file mode 100755
index 0000000..19a403b
--- /dev/null
+++ b/savedefconfig.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2019, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+import argparse
+
+import kconfiglib
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description="""
+Saves a minimal configuration file that only lists symbols that differ in value
+their defaults. Loading such a configuration file is equivalent to loading the
+"full" configuration file.
+
+Minimal configuration files are handy to start from when editing configuration
+files by hand.
+
+The default input configuration file is '.config'. A different input filename
+can be passed in the KCONFIG_CONFIG environment variable.
+
+Note: Minimal configurations can also be generated from within the menuconfig
+interface.
+""")
+
+    parser.add_argument(
+        "--kconfig",
+        default="Kconfig",
+        help="Base Kconfig file (default: Kconfig)")
+
+    parser.add_argument(
+        "--out",
+        default="defconfig",
+        help="Output filename for minimal configuration (default: defconfig)")
+
+    args = parser.parse_args()
+
+    kconf = kconfiglib.Kconfig(args.kconfig)
+    kconf.load_config()
+    kconf.write_min_config(args.out)
+
+
+if __name__ == "__main__":
+    main()