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-rw-r--r--config/rebuild_check.py68
1 files changed, 68 insertions, 0 deletions
diff --git a/config/rebuild_check.py b/config/rebuild_check.py
new file mode 100644
index 0000000000..a906fdc304
--- /dev/null
+++ b/config/rebuild_check.py
@@ -0,0 +1,68 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import errno
+import os
+
+
+def mtime(path):
+ try:
+ return os.stat(path).st_mtime
+ except OSError as e:
+ if e.errno == errno.ENOENT:
+ return -1
+ raise
+
+
+def rebuild_check(args):
+ target = args[0]
+ deps = args[1:]
+ t = mtime(target)
+ if t < 0:
+ print(target)
+ return
+
+ newer = []
+ removed = []
+ for dep in deps:
+ deptime = mtime(dep)
+ if deptime < 0:
+ removed.append(dep)
+ elif deptime > t:
+ newer.append(dep)
+
+ def format_filelist(filelist):
+ if not filelist:
+ return None
+
+ limit = 5
+ length = len(filelist)
+ if length < limit:
+ return ", ".join(filelist)
+
+ truncated = filelist[:limit]
+ remaining = length - limit
+
+ return "%s (and %d other files)" % (", ".join(truncated), remaining)
+
+ newer = format_filelist(newer)
+ removed = format_filelist(removed)
+
+ if newer and removed:
+ print(
+ "Rebuilding %s because %s changed and %s was removed"
+ % (target, newer, removed)
+ )
+ elif newer:
+ print("Rebuilding %s because %s changed" % (target, newer))
+ elif removed:
+ print("Rebuilding %s because %s was removed" % (target, removed))
+ else:
+ print("Rebuilding %s for an unknown reason" % target)
+
+
+if __name__ == "__main__":
+ import sys
+
+ rebuild_check(sys.argv[1:])