1 files changed, 29 insertions, 0 deletions
diff --git a/scripts/flock.py b/scripts/flock.py
new file mode 100755
index 0000000000..6ceb585cdc
--- /dev/null
+++ b/scripts/flock.py
@@ -0,0 +1,29 @@
+#!/usr/bin/env python
+
+import fcntl, os, subprocess, sys, errno
+
+# from http://stackoverflow.com/a/600612
+def mkdir_p(path):
+    try:
+        os.makedirs(path)
+    except OSError as exc: # Python >2.5
+        if exc.errno == errno.EEXIST and os.path.isdir(path):
+            pass
+        else: raise
+
+def flock(lockfile, cmd_list, verbose = False):
+    mkdir_p(os.path.dirname(lockfile))
+    fd = os.open(lockfile, os.O_RDONLY | os.O_NOCTTY | os.O_CREAT, 0o666)
+    fcntl.flock(fd, fcntl.LOCK_EX)
+    if verbose:
+        print(' '.join(cmd_list))
+    return subprocess.call(cmd_list)
+
+if '__main__' == __name__:
+    try:
+        if sys.argv[1] == '-v':
+            sys.exit(flock(sys.argv[2], sys.argv[3:], True))
+        else:
+            sys.exit(flock(sys.argv[1], sys.argv[2:]))
+    except KeyboardInterrupt:
+        sys.exit(1)