prepublish.sh

#!/bin/bash

# Prepublish checks

set -e

REPO=js-modules

# Make sure that the local branch tip revision is the same 
# as upstream master.
LOCAL_TIP=$(git rev-parse HEAD)
REMOTE_TIP=$(git ls-remote https://github.com/jenkinsci/$REPO master | awk '{ print $1 }')

if [ $LOCAL_TIP != $REMOTE_TIP ]
then
    echo Local git tip $LOCAL_TIP is not the same as upstream remote master tip $REMOTE_TIP. You must push upstream before you can publish.
    exit 1
fi