Post-commit hook script to make actual master branch archive in every commit

post-commit.sh

#!/bin/bash
#
# created date:     26.09.2016
# last update date: 26.09.2016
# author:           @yugoslavskiy
#
# post-commit hook script to make actual master branch archive in every commit
# 1) save it as a .git/hooks/post-commit 
# 2) create .git/hooks/last_hooked_commit — first time it has to be previous commit hash:
# 	$ git log -1 --format="%H" > .git/hooks/last_hooked_commit
# 3) profit.
#

last_hooked_commit=$( cat .git/hooks/last_hooked_commit )
last_manual_commit=$( cat .git/hooks/last_manual_commit )
preprevious_commit=$( git log -2 --format="%H" | tail -1 )

# if PREprevious commit was manual — we are on looped post-commit hook, break it.
if [ "${preprevious_commit}" == "${last_manual_commit}" ]; then
	git rev-parse HEAD > .git/hooks/last_hooked_commit
	exit 0
elif [ "${preprevious_commit}" == "${last_hooked_commit}" ]; then
	git rev-parse HEAD > .git/hooks/last_manual_commit
	git archive master --format=zip --output=master.zip
	git add master.zip
	git commit -a -m 'updated/added actual master branch archive'
else
	echo "shit. i do not know wtf is going on" > .git/hooks/post_commit_errorlog
	exit 1
fi