A pre-push hook to prevent using the wrong email when pushing to a specific remote

pre-push-prevent-using-wrong-email

#!/bin/sh

########################################
# A pre-push hook to prevent using the wrong email when pushing to a specific remote
#
# Setup:
# $ curl https://gist.githubusercontent.com/acecilia/f7eb2ba6b1b5d015e96a9a52f3f12480/raw --output ~/.githooks/pre-push
# $ chmod +x ~/.githooks/pre-push
#
# In your .gitconfig add the following under the [core] section:
# hooksPath = ~/.githooks
########################################

set -euo pipefail

# The commits range being pushed
range="--all"

# Calculate the range of commits that are being pushed
# From https://github.com/git/git/blob/master/templates/hooks--pre-push.sample
z40=0000000000000000000000000000000000000000
while read local_ref local_sha remote_ref remote_sha
do
    if [ "$local_sha" = $z40 ]
    then
        # Handle delete
        :
    else
        if [ "$remote_sha" = $z40 ]
        then
            # New branch, examine all commits
            range="$local_sha"
        else
            # Update to existing branch, examine new commits
            range="$remote_sha..$local_sha"
        fi
    fi
done

# Setup
echo "Inspecting the following commit range: ${range}"
remote="$2"
unknown_remote=true

# Obtain emails in commits
authors=`git shortlog -s -n -e ${range}`
committers=`git shortlog -s -n -e -c ${range}`
emails="${authors} ${committers}"

function avoidLeakingEmail {
    remoteRegex="$1"
    privateEmail="$2"

    if [[ $remote == *"$remoteRegex"* ]]; then
        unknown_remote=false

        if [[ $emails == *"$privateEmail"* ]]; then
            echo "The email '${privateEmail}' shows up as author or commiter in this repository"
            exit 1
        fi
    fi
}

########################################
# Add your remotes and private emails below
########################################

# Any github remote
avoidLeakingEmail "github" "you@your_company.com"

if [ "$unknown_remote" = true ] ; then
    echo 'This remote is unknown: update your private emails in the pre-push hook'
    exit 1
fi

# Run local pre-commit hook if exists
if [ -e ./.git/hooks/pre-push ]; then
    ./.git/hooks/pre-push "$@"
fi