Post-checkout Django migrations rollback

Git post-checkout script to roll back Django migrations. The script has been created for development purposes, under no circumstances should be used on a production environment.

Installation & usage

Download the django-post-checkout-rollback.sh script (or south-post-checkout-rollback.sh for South migrations), copy it to the .git/hooks/ directory of your Django project and add it to the .git/hooks/post-checkout script:

#!/bin/sh

$GIT_DIR/hooks/django-post-checkout-rollback.sh "$@"

Set the MASTER_BRANCH variable if you want the script to always roll back migrations to the master branch (recommended).

If you need to skip the rollback process for a particular checkout, set the SKIP_POST_ROLLBACK variable when calling the command:

SKIP_POST_ROLLBACK=1 git checkout some_branch

Limitations

1. In this house we obey the laws of thermodynamics. Specially the second one. That means migrations should only move forwards along with the commit history. The script won't work on branches that don't obey this principle (you'll get a warning message).

2. The script will skip the rollback process if it encounters a detached HEAD after the checkout (e.g. a branch rebase or a remote branch checkout).