Python pre-commit hook feature to check if python package requirements have changed. Useful for maintaining consistency across virtualenvs. Can be skipped using git commit --no-verify

pre-commit.sh

#!/bin/sh

# To version control your hook, save this script inside your repository e.g. .githooks/
# Then run 'git config core.hooksPath .githooks' to point your local repository to it

# Check if the python package requirements match the existing requirements
pip freeze | diff requirements.txt -
if [ $? -ne 0 ]
then
    echo "The requirements have changed!"
    echo "Update the requirements file and commit it"
    exit 1
fi

# Check that the updated requirements file has been staged
CHANGED=`git diff --stat -- requirements.txt | wc -l`
if [ $CHANGED -ne 0 ];
then
    echo "The requirements have changed!"
    echo "Stage the new requirements file"
    exit 1
fi