#!/bin/sh
dir=`dirname $0`/../../../conf/net
progname=`basename $0`
cd $dir
diffsep=
diffall=
tmpdira=a
tmpdirb=b
case `uname` in
Linux|*BSD*)
	tmpdiropt='-p /tmp'
	;;
*)
	# Darwin does not have -p option...
	;;
esac
tmpdir="`mktemp -u $tmpdiropt -d $progname.XXXXXXXX`"
#
usage()
{
	echo "
Usage:
	$progname -h
	$progname [-d]
Description:
	check to see if a configuration of a network switch generated
	by \`\`config-gets'' and stored into $dir
	is changed or not.  Also, revert trivial modification such as
	NTP drift, a timestamp of a configuration and so on.
Options:
	-h:	display this message.
	-d:	display detailed diff.
"
}

if [ ! -z "$1" -a ! "$1" = "-d" ]; then
	usage
	exit 1
fi

#
# filters to ignore a difference of a configuration of Cisco, Alaxala,
# Aruba WLC and NEC IX series even though no actual changes are made
# like below:
#
# Cisco:
# ! Last configuration change at 23:16:01 jst Sat Apr 14 2018 by hogehoge
# ! NVRAM config last updated at 00:28:45 jst Sun Apr 8 2018 by hogehoge
#
# Alaxala:
# #Last modified by hogehoge at Sun Apr 15 04:00:03 2018 JST with version 12.7.B
#
# NEC IX:
# ! Current time Apr 15-Sun-2018 02:11:02 JST
#
regexp="								\
	-e ^ntp\sclock-period -e ^!\s(N|L|C) -e ^#L			\
	-e ^\s{3}key\s -e ^\s{3}ap-console-password\s			\
	-e ^\s{3}bkup-passwords\s -e ^\s{3}wpa-passphrase\s		\
	"
grep="grep -E $regexp"
grepex="grep -Ev $regexp"
#
if ! mkdir -p "$tmpdir/$tmpdira" "$tmpdir/$tmpdirb" > /dev/null 2>&1; then
	echo "Cannot create temporary directory!!!"
	exit 1
fi
for path in *.conf; do
	file=`basename $path`
	diff=`git diff "$file"`

	# force to generate diff. for a untracked file.
	if [ -z "$diff" ]; then
		if git status "$file" | grep "$file" > /dev/null 2>&1; then
			diff=`diff -wc /dev/null "$file"`
		fi
	fi

	[ -z "$diff" ] && continue

	#
	# hack for Cisco and Aruba WLC that have different values,
	# e.g., NTP drift or password hash values, in configuration
	# output even though the configuration is never modified.
	#
	if $grep "$file" > /dev/null 2>&1; then
		tmpfilea="$tmpdir/$tmpdira/$file"
		tmpfileb="$tmpdir/$tmpdirb/$file"
		git show HEAD:./$file |	$grepex > "$tmpfilea"
		$grepex "$file" > "$tmpfileb"
		diff=`cd "$tmpdir" &&					\
		    diff -wc "$tmpdira/$file" "$tmpdirb/$file"`
		if [ -z "$diff" ]; then
			git checkout HEAD -- $file
			continue
		fi
	fi

	echo "$file changes"
	diffall="$diffall$diffsep$diff"
	diffsep="
"
done
rm -rf "$tmpdira" "$tmpdirb"

if [ -z "$diffall" ]; then
	echo 'nothing changed.'
elif [ "$1" = '-d' ]; then
	echo ''
	echo "$diffall" | sed -re '/^[^ ]* +block-list \[ / s/\./[.]/g'
fi