scripts: Add script to apply configs to a source tree

Author: mpe

scripts/misc/apply-configs.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+#
+# Apply configs from etc/configs/ to the local kernel tree.
+#
+# eg.
+# $ cd ~/linux
+# $ make ppc64le_defconfig
+# $ ~/ci-scripts/scripts/misc/apply-configs.py 4k-pages compat-y
+# $ make olddefconfig
+# 
+# Or a group of configs defined in configs.py:
+#
+# $ ~/ci-scripts/scripts/misc/apply-configs.py guest_configs
+
+ 
+from subprocess import run
+import os, sys
+
+base_dir = os.path.realpath(f'{os.path.dirname(os.path.realpath(sys.argv[0]))}/../..')
+sys.path.append(f'{base_dir}/lib')
+
+import configs
+
+
+def main(args):
+    if len(args) == 0:
+        print('Usage: apply-configs.py (config group|config file)+')
+        return False
+
+    names = []
+    for arg in args:
+        try:
+            group = getattr(configs, arg)
+        except AttributeError:
+            names.append(arg)
+        else:
+            names.extend(group)
+
+    src_dir = os.getcwd()
+    paths = []
+    for name in names:
+        # Look in source tree first, which must be current directory
+        full_path = f'{src_dir}/{name}'
+        if os.path.exists(full_path):
+            paths.append((name, full_path))
+            continue
+
+        full_path = f'{base_dir}/etc/configs/{name}'
+        if not name.endswith('.config'):
+            full_path += '.config'
+
+        if not os.path.exists(full_path):
+            print(f'Error: unable to find {name}')
+            return False
+
+        paths.append((name, full_path))
+
+    kbuild_output = os.environ.get('KBUILD_OUTPUT', None)
+    if kbuild_output:
+        # merge_config.sh writes its TMP files to $PWD, so change into KBUILD_OUTPUT
+        os.chdir(kbuild_output)
+
+    for name, path in paths:
+        print(f'Merging {name} ...')
+        rc = run([f'{src_dir}/scripts/kconfig/merge_config.sh', '-m', '.config', path])
+        if rc.returncode != 0:
+            print(f'Error: failed merging {name}')
+            return False
+
+    return True
+
+
+sys.exit(0 if main(sys.argv[1:]) else 1)