From 333d926de93d4427e4c32c52e7dd18649132a00b Mon Sep 17 00:00:00 2001
From: Regina Kleinhappel <regina@treefish.org>
Date: Tue, 29 Jul 2014 23:30:43 +0200
Subject: [PATCH] Using lockfiles for unique instance.

---
 backmeupscotty         | 42 ++++++++++++++++++++++++++----------------
 backmeupscotty-example | 12 ++++++++++++
 2 files changed, 38 insertions(+), 16 deletions(-)

diff --git a/backmeupscotty b/backmeupscotty
index ed41ae2..c1fa9da 100644
--- a/backmeupscotty
+++ b/backmeupscotty
@@ -18,22 +18,6 @@ function scottyerror {
     echo $(upperme): $@ >&2 
 }
 
-if [ $(pidof -x $(basename $0) | wc -w) -gt 2 ]; then 
-    scottyerror Another instance of $(basename $0) is already running!
-    exit 1
-fi
-
-while getopts "qn:" opt; do
-    case $opt in
-	q)
-	    exec > /dev/null
-	    ;;
-	n)
-	    BACKUP_RUNEVERYNTHDAY=$OPTARG
-	    ;;
-    esac
-done
-
 function grepbackups {
     ssh $REMOTE_HOST "ls $REMOTE_DIR" | grep -E '[0-9]+-[0-9]+'
 }
@@ -116,6 +100,12 @@ function scottysync {
     done
 }
 
+function deleteLock {
+    if ! rmdir /tmp/$(basename $0).lock; then
+	scottyerror "Could not delete lockfile /tmp/$(basename $0).lock!"
+    fi
+}
+
 function prepare {
     scottyinfo "Preparing for sync"
 }
@@ -126,11 +116,14 @@ function cleanup_abrt {
 
 function _cleanup_abrt {
     scottyerror "Caught exit signal! Cleaning up..."
+
     cleanup_abrt
+
     if [ $(jobs -p) ]; then
 	scottyerror TERMinating remaining child processes...
 	kill $(jobs -p)
     fi
+    deleteLock
     exit
 }
 
@@ -148,6 +141,7 @@ function cleanup_normal {
 
 function _cleanup_normal {
     cleanup_normal
+    deleteLock
 }
 
 function backmeupscotty {
@@ -164,3 +158,19 @@ function backmeupscotty {
 
     trap - EXIT
 }
+
+if ! mkdir /tmp/$(basename $0).lock; then
+    scottyerror "Another instance of $(basename $0) is still running!"
+    exit 1
+fi
+
+while getopts "qn:" opt; do
+    case $opt in
+	q)
+	    exec > /dev/null
+	    ;;
+	n)
+	    BACKUP_RUNEVERYNTHDAY=$OPTARG
+	    ;;
+    esac
+done
diff --git a/backmeupscotty-example b/backmeupscotty-example
index b9acea7..9418571 100755
--- a/backmeupscotty-example
+++ b/backmeupscotty-example
@@ -10,4 +10,16 @@ BACKUP_RUNEVERYNTHDAY=1
 SYNC_SRC="/home/regina/backtest/source"
 SYNC_EXC="/gack,/gugu/*"
 
+function prepare {
+    echo "prepare"
+}
+
+function cleanup_normal {
+    echo "cleanup"
+}
+
+function cleanup_abrt {
+    echo "cleanup_abrt"
+}
+
 backmeupscotty
-- 
2.39.5