fast-forward-merge.sh

#!/usr/bin/env bash 

if [ $# -eq 0 ]
  then
    echo "$(basename "$0") GIT_REPO FORK_USER_NAME USER_BRANCH
example:

    ./$(basename "$0") checkstyle konstantinos issue73
"
	exit 0;
fi

GIT_REPO=$1
FORK_USER_NAME=$2
USER_BRANCH=$3
REPO=$FORK_USER_NAME-fork
LOCAL_USER_BRANCH=$FORK_USER_NAME-$USER_BRANCH

echo "adding remote ..."
git remote add $REPO https://github.com/$FORK_USER_NAME/$GIT_REPO.git
git fetch $REPO

echo "creating local branch ..."
git checkout -b $LOCAL_USER_BRANCH $REPO/$USER_BRANCH

echo "rebasing over master ..."
git rebase master

echo "merge to master ..."
git checkout master
git merge $LOCAL_USER_BRANCH

echo "removing local branch ..."
git branch -D $LOCAL_USER_BRANCH

echo "removing remote ..."
git remote rm $REPO