Fix read locks on read-only file systems (#1857)

2016-09-30 18:45:08 +02:00 · 2016-09-30 18:45:08 +02:00 · 8d1ec0df3d
commit 8d1ec0df3d
parent 6c627dbac9
1 changed files with 2 additions and 1 deletions
--- a/lib/spack/llnl/util/lock.py
+++ b/lib/spack/llnl/util/lock.py
@ -70,7 +70,8 @@ def _lock(self, op, timeout):
        while (time.time() - start_time) < timeout:
            try:
                if self._fd is None:
-                    self._fd = os.open(self._file_path, os.O_RDWR)
+                    mode = os.O_RDWR if op == fcntl.LOCK_EX else os.O_RDONLY
+                    self._fd = os.open(self._file_path, mode)

                fcntl.lockf(self._fd, op | fcntl.LOCK_NB)
                if op == fcntl.LOCK_EX: