Use a script to clean-up custom-target output dirs

The script will manually delete all custom_target outputs that are
directories instead of files. This is needed because on platforms other
than Windows, Ninja only deletes directories while cleaning if they are
empty.

Closes #1220

1 files changed, 43 insertions, 0 deletions

diff --git a/mesonbuild/scripts/cleantrees.py b/mesonbuild/scripts/cleantrees.py
new file mode 100644
index 0000000..0af8dd0
--- /dev/null
+++ b/mesonbuild/scripts/cleantrees.py
@@ -0,0 +1,43 @@
+# Copyright 2016 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import sys
+import shutil
+import pickle
+
+def rmtrees(build_dir, trees):
+    for t in trees:
+        # Never delete trees outside of the builddir
+        if os.path.isabs(t):
+            print('Cannot delete dir with absolute path {!r}'.format(t))
+            continue
+        bt = os.path.join(build_dir, t)
+        # Skip if it doesn't exist, or if it is not a directory
+        if os.path.isdir(bt):
+            shutil.rmtree(bt, ignore_errors=True)
+
+def run(args):
+    if len(args) != 1:
+        print('Cleaner script for Meson. Do not run on your own please.')
+        print('cleantrees.py <data-file>')
+        return 1
+    with open(args[0], 'rb') as f:
+        data = pickle.load(f)
+    rmtrees(data.build_dir, data.trees)
+    # Never fail cleaning
+    return 0
+
+if __name__ == '__main__':
+    run(sys.argv[1:])