django_post-merge.sh

#!/bin/sh
#Inspired by https://gist.github.com/jbergantine/3870080
#Since every `git pull` is actually a merge. We can use it to automaticly run basic Django tasks after pulling from the upstream master branch (or any other)
#Notice: This won't run at git fetch. since fetch doesn't merge anything
#Installation:
#	copy this script with the name:`post-merge.sh` to your project root folder
#	symlink it to the ./git/hooks/post-merge: `ln post-merge.sh .git/hooks/post-merge

#You should have bash (windows users, means cygwin/mingw anything that works for you
#Based on the instructions here: https://oknesset-devel.readthedocs.org/en/latest/workflow.html#before-coding
if [ $(python -c "import sys; print(sys.prefix == sys.real_prefix)" | grep False -c) -eq 0 ]
then
	echo "you aren't pulling in a virtualenv, no automatic mergehandling for you!"
	exit 0
fi

if [ $(git diff HEAD@{1} HEAD --name-only | grep 'requirements.txt' -c) -ne 0 ]
then
#Notice you should run this script inside a working virtualenv
	pip install -r requirements.txt
fi

#python manage.py syncdb
if [ $(git diff HEAD@{1} HEAD --name-only | grep 'migrations' -c) -ne 0 ]
then
	python manage.py migrate
fi

python manage.py test

I Still need to to check if python manage.py test would work since test is a bash keyword

test is not a bash keyword since bash has none. It is a bash command (only within an appropriate context) and an executable filename. Here, test is a command-line argument, so it is legal just like any other string.

You can use the grep exit code directly in the condition instead of doing a numerical check:
e.g. replace line 17 by

if git diff HEAD@{1} HEAD --name-only | grep 'requirements.txt' -q

When inside a virtualenv, the VIRTUAL_ENV env variable is set.