pre-commit hook for Maven multi-project repositories - Build and run tests for each Maven project for which there are staged files

pre-commit.sh

#!/bin/bash

# Install with:
# ln -s ../../pre-commit.sh .git/hooks/pre-commit

# Inspired by:
# https://gist.github.com/arnobroekhof/9454645

function pop_stash {
    STASHES=($(git stash list))
    for stash in "${STASHES[@]}"
    do
        if [[ $stash == "$1" ]]; then
          git stash pop -q
        fi
    done
}

echo "Build and run tests for each project for which there are staged files"

STASH_NAME="pre-commit-$(date +%s)"
git stash save -q --keep-index "$STASH_NAME"

CWD=$(pwd)
PARENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/../.. && pwd )"

cd "$PARENT_DIR"

PROJECTS=($(ls -d ./*/))

for project in "${PROJECTS[@]}"
do
    changed_files=($(git diff --cached --name-only "$project"))
    changed_files_number=${#changed_files[@]}
    if [ "$changed_files_number" -gt 0 ]; then
        cd "$project"

        mvn clean install
        if [ $? -ne 0 ]; then
            echo "Error while building $project"
            cd "$CWD"
            pop_stash "$STASH_NAME"
            exit 1
        fi

        cd "$PARENT_DIR"
    fi
done

pop_stash "$STASH_NAME"

cd "$CWD"