From 54402ce08906df0e7675766a84b788986f2bfd92 Mon Sep 17 00:00:00 2001
From: Jan-Philipp Litza <janphilipp@litza.de>
Date: Sun, 6 Jul 2014 20:07:49 +0200
Subject: [PATCH] mkmap.sh: Add locking around script call

---
 mkmap.sh | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/mkmap.sh b/mkmap.sh
index 1c6453f..28195be 100755
--- a/mkmap.sh
+++ b/mkmap.sh
@@ -3,10 +3,30 @@
 set -e
 
 DEST=$1
-
+LOCKFILE="/run/lock/ffmap"
 
 [ "$DEST" ] || exit 1
 
 cd "$(dirname "$0")"/
 
+if lockfile-check "$LOCKFILE"; then
+    exit
+fi
+lockfile-create "$LOCKFILE"
+lockfile-touch "$LOCKFILE" &
+LOCKPID="$!"
+
 ./bat2nodes.py -A -a aliases.json -d $DEST
+
+kill "$LOCKPID"
+lockfile-remove "$LOCKFILE"
+
+if lockfile-check "$LOCKFILE-sync"; then
+    exit
+fi
+lockfile-create "$LOCKFILE-sync"
+lockfile-touch "$LOCKFILE-sync" &
+LOCKPID="$!"
+
+kill "$LOCKPID"
+lockfile-remove "$LOCKFILE-sync"