#!/bin/bash
set -e

#
# grab and compare slackware linux kernel config changes
# enable as a weekly cron job
#
# we use .txt extension here as it makes it easier to host on lab.nethence.com
# without the need to tune the nginx default mime type
#

day=`date +%Y-%m-%d`
workdir=/data/www/lab.nethence.com/confdiff/$day/
#mirror=`grep -vE '^#|^$' /etc/slackpkg/mirrors`

# we would not go for patches/ against current
#mirror=http://nephtys.lip6.fr/pub/linux/distributions/slackware/slackware64-current/

# we go for patches/ for releases
mirror=http://nephtys.lip6.fr/pub/linux/distributions/slackware/slackware64-15.0/

echo workdir is $workdir
mkdir -p $workdir/patch/
cd $workdir/
echo

echo mirror is $mirror
echo

wget -q -O - $mirror/kernels/VERSIONS.TXT > VERIONS.TXT
wget -q -O - $mirror/kernels/huge.s/config > config
wget -q -O - $mirror/patches/FILE_LIST > FILE_LIST

grep -vE '^#|^$' config | sort -V > config.clean.txt

pkg=`grep -E 'kernel-huge-.*.txz$' FILE_LIST | awk '{print $NF}'`
[[ -z $pkg ]] && echo could not define kernel-huge file name out of FILE_LIST && exit 1
echo pkg is $pkg
echo

wget -q -O - $mirror/patches/$pkg | tar xJf - -C patch/
rm -f patch/boot/vmlinuz-*

cd ../
grep -vE '^#|^$' $day/patch/boot/config-huge-* | sort -V > $day/patch/boot/config-huge.clean.txt

#echo produce diff between release kernel config and latest from release patches
echo diff since release
diff -bu $day/config.clean.txt $day/patch/boot/config-huge.clean.txt > $day-since-release.txt \
	|| true

echo -n config symlink...
ln -sf $day/patch/boot/config-huge.clean.txt config.txt && echo done

cat <<EOF

kernel config changes since last release

	https://lab.nethence.com/confdiff/$day-since-release.txt

link to latest kernel config

	https://lab.nethence.com/confdiff/config.txt

EOF