puppet 4 foo

[mirror/dsa-puppet.git] / modules / debian_org / files / molly-guard / 15-acquire-reboot-lock

diff --git a/modules/debian_org/files/molly-guard/15-acquire-reboot-lock b/modules/debian_org/files/molly-guard/15-acquire-reboot-lock
new file mode 100644 (file)
index 0000000..ebbac93
--- /dev/null
+++ b/modules/debian_org/files/molly-guard/15-acquire-reboot-lock
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+# Copyright 2012 Peter Palfrader
+
+l=/var/run/reboot-lock
+exec 3> $l
+
+if ! flock --exclusive -w 0  3; then
+       echo >&2 "Cannot acquire reboot lock."
+       exit 1
+fi
+echo "Reboot lock acquired."
+
+ppid="$PPID"
+(
+       while kill -0 "$ppid" 2>/dev/null; do
+               sleep 1
+       done
+) &
+disown
+exit 0