Allow user to run anacron jobs on battery

The user can allow running anacron jobs on battery by adding the string `ANACRON_RUN_ON_BATTERY_POWER=yes` to the file `/etc/default/anacron`.

contrib/0anacron

@@ -7,19 +7,32 @@ if [ `date +%Y%m%d` = "$day" ]; then
  exit 0
 fi
 
-# Do not run jobs when on battery power
-online=1
-for psupply in /sys/class/power_supply/* ; do
- if [ `cat "$psupply/type" 2>/dev/null`x = Mainsx ] && [ -f "$psupply/online" ]; then
- if [ `cat "$psupply/online" 2>/dev/null`x = 1x ]; then
- online=1
- break
- else
- online=0
+# Check whether run on battery should be allowed
+check_online=1
+if test -r /etc/default/anacron; then
+ run_on_battery=`grep ANACRON_RUN_ON_BATTERY_POWER /etc/default/anacron | awk -F'=' '{print $2}'`
+ if [ $run_on_battery = "yes" ]; then
+ check_online=0
+ fi
+fi
+
+if [ $check_online = 1 ]; then
+
+ # Do not run jobs when on battery power
+ online=1
+ for psupply in /sys/class/power_supply/* ; do
+ if [ `cat "$psupply/type" 2>/dev/null`x = Mainsx ] && [ -f "$psupply/online" ]; then
+ if [ `cat "$psupply/online" 2>/dev/null`x = 1x ]; then
+ online=1
+ break
+ else
+ online=0
+ fi
  fi
+ done
+ if [ $online = 0 ]; then
+ exit 0
  fi
-done
-if [ $online = 0 ]; then
- exit 0
+
 fi
 /usr/sbin/anacron -s