pre-push hook for Flink commiters

pre-push

#!/bin/bash

####
##
## Pre-push hook which protects a remote branch
## by running a verify command before pushing.
##
## Should be place in .git/hooks/pre-push
##
## protected_remote can be a substring
protected_remote="git.apache.org/flink.git"
protected_branch="master"
## command that verifies before pushing
verify="mvn clean package"
##
##
##
####

# parameters passed by git
remote_name=$1
remote_url=$2

current_branch_ref=$(git symbolic-ref HEAD)
protected_branch_ref="refs/heads/$protected_branch"

IFS=' '
while read local_ref local_sha remote_ref remote_sha
do
    # trigger only if we are pushing to the remote and protected branch
    if [[ $remote_url == *"$protected_remote"* ]] && \
       [[ $remote_ref == $protected_branch_ref ]]; then

        # check for pending changes which might not be commited
        if [[ $(git diff --shortstat 2> /dev/null | tail -n1) != "" ]] ; then
            echo "Please commit or stash your pending changes."
            exit 1
        fi

        # to able to verify, we need to be on the branch to be pushed
        # e.g. if you use git push other:master
        if [[ $local_ref != $current_branch_ref ]] ; then
            echo "Please switch to branch '$local_ref' to verify."
            exit 1
        fi

        # verify
        echo "Verifying push to $protected_branch via '$verify'."
        $verify
        RESULT=$?
        if [ $RESULT -ne 0 ]; then
            echo "Commits could not be verified. Executed '$verify' and it returned $RESULT"
            exit 1
        fi

    fi
done

exit 0