#!/bin/bash

# pkglistbu.sh

# Automatically back up package lists to a file
# intended to run as a cron/timer job

pluser=dthurstenson
pldate=`date +%Y%m%d`
pldir=/home/$pluser/.pkglists/
plist=$pldir$HOSTNAME.$pldate.list
plog=$pldir$HOSTNAME.list.log
platest=$(ls -t -d -1 $pldir$HOSTNAME*.list | head -1)

echo Last list: $platest

echo Getting package list for: $HOSTNAME

pacman -Qqen > $plist
chown $pluser:$pluser $plist

echo Comparing $platest to $plist

# If $platest differs from $plist
if ! cmp $platest $plist >/dev/null 2>&1
then
	# Add diff to log
	printf "\n\n=== $(date +%m.%d.%Y) ==\n" >> $plog
	diff $platest $plist | grep '[<>]' >> $plog

	echo "Adding and commiting changes to git repo"
	git -C /home/$pluser add $pldir
	git -C /home/$pluser commit -m "Pkglistbu auto commit for $date"

	echo Done: Package list stored at: $plist
else
	echo $platest and $plist are identical!
	echo "Package list hasn't changed since last run"
	rm $plist 
	echo Done.
fi