Naive sample implementation of this feature, not tested at all. Maybe better use as inspiration rather than concrete implementation...
-- Tuomas Jormola <[email protected]>
diff -ur backupninja-0.9.5.orig/etc/backupninja.conf.in backupninja-0.9.5/etc/backupninja.conf.in
--- backupninja-0.9.5.orig/etc/backupninja.conf.in 2007-03-04 12:29:26.000000000 +0200
+++ backupninja-0.9.5/etc/backupninja.conf.in 2009-01-09 12:50:24.494527275 +0200
@@ -62,6 +62,9 @@
# where backupninja libs are found
libdirectory = @pkglibdir@
+# where backupninja stores action lock files
+lockdirectory = @localstatedir@/lock
+
# whether to use colors in the log file
usecolors = yes
diff -ur backupninja-0.9.5.orig/man/backupninja.conf.5 backupninja-0.9.5/man/backupninja.conf.5
--- backupninja-0.9.5.orig/man/backupninja.conf.5 2005-11-19 19:11:28.000000000 +0200
+++ backupninja-0.9.5/man/backupninja.conf.5 2009-01-09 12:51:00.844527176 +0200
@@ -66,6 +66,10 @@
.B scriptdirectory
Where backupninja handler scripts are found
+.TP
+.B lockdirectory
+Where backupninja stores action lock files
+
.TP
.B usecolors
If set to 'yes', use colors in the log file and debug output.
diff -ur backupninja-0.9.5.orig/src/backupninja.in backupninja-0.9.5/src/backupninja.in
--- backupninja-0.9.5.orig/src/backupninja.in 2007-10-12 20:42:46.000000000 +0300
+++ backupninja-0.9.5/src/backupninja.in 2009-01-09 13:29:38.552333945 +0200
@@ -227,6 +227,27 @@
return 1
}
+# Returns the hostname in a portable way
+function findhostname() {
+ local hostname=$HOSTNAME
+ [ -z "$hostname" ] && hostname=`hostname 2>/dev/null`
+ if [ -n "$hostname" ]; then
+ echo $hostname
+ return
+ fi
+ echo localhost
+}
+
+# Return 1 if given PID is running, 0 if not and 2 in case of error.
+# TODO: Only Linux and supported, should support other operating systems
+# by running ps with suitable arguments for the system and parsing the result
+function checkpidalive() {
+ local pid="$1"
+ [ -z "$pid" ] && return 2
+ [ -d /proc/$pid ] && return 0
+ return 1
+}
+
function usage() {
cat << EOF
$0 usage:
@@ -273,6 +294,41 @@
local run="no"
setfile $file
+ # skip over this config if another instance is already running
+ getconf lockdir @localstatedir@/lock/backupninja
+ if ! [ -d "$lockdir" ]; then
+ if ! mkdir -p "$lockdir" >/dev/null 2>&1; then
+ msg "*failed* -- $file"
+ errormsg="$errormsg\n== could not create lock directory $lockdir ==\n"
+ error "<<<< finished action $file: ERROR"
+ return
+ fi
+ fi
+ if ! [ -w "$lockdir" ]; then
+ msg "*failed* -- $file"
+ errormsg="$errormsg\n== lock directory $lockdir not writable ==\n"
+ error "<<<< finished action $file: ERROR"
+ return
+ fi
+ local hostname=`findhostname`
+ local basename=`basename $file`
+ local lockfile="${lockdir}/${hostname}_${basename}.lock"
+ local currentargs="${bash_ar...@]}"
+ if [ -e $lockfile ]; then
+ local previouspid=`cat $lockfile | cut -d' ' -f1`
+ local previousargs=`cat $lockfile | cut -d' ' -f2-`
+ checkpidalive $previouspid
+ local previouspidalive=$?
+ if [ $previouspidalive == 0 ] && [ "$previousargs" == "$currentargs" ]; then
+ info ">>>> skipping action $file because the action is currently running already"
+ return
+ else
+ echo $$ $currentargs > $lockfile
+ fi
+ else
+ echo $$ $currentargs > $lockfile
+ fi
+
# skip over this config if "when" option
# is not set to the current time.
getconf when "$defaultwhen"
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