bin/check-mirrors: use lock file to only run once without parameters at the same time

1 files changed, 8 insertions, 0 deletions

diff --git a/bin/check-mirrors b/bin/check-mirrors
index 8e782d5..d0b626c 100755
--- a/bin/check-mirrors
+++ b/bin/check-mirrors
@@ -5,6 +5,14 @@
 
 if [ $# -eq 0 ]; then
 
+# Create a lock file.
+
+  exec 9> "${check_mirrors_lock_file}"
+  if ! verbose_flock 9; then
+    >&2 echo 'come back (shortly) later - I cannot lock check-mirrors.'
+    exit
+  fi
+
   echo 'updating mirrors from git...' >&2
 
   if [ -d "${releng_directory}/.git" ]; then