From 218831d810b44675c948786d3ce4d3d3180e83e0 Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Sun, 1 Jan 2023 14:43:26 +0100
Subject: [PATCH] Re-open lock file before locking

because the previous 'withlock' cleanup function might have deleted
the file and since we still held a handle to the old deleted file,
we could run concurrently with a 3rd 'withlock' which creates a new file.

Fixes #1
Fixes boo#864785

Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
---
 withlock | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/withlock b/withlock
index 01ef866..9e16f69 100755
--- a/withlock
+++ b/withlock
@@ -137,12 +137,11 @@ def main():
 
     prev_umask = os.umask(0o066)
 
-    lock = open(lockfile, 'w')
-
     global got_lock
     while 1 + 1 == 2:
 
         try:
+            lock = open(lockfile, 'w')
             fcntl.lockf(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
             got_lock = True
             break