gistfile1.sh

#!/bin/bash

set -x -e

# update master first
git checkout master
git pull upstream master
git push origin master

REVIEW_BRANCH_NAME=_reviewbranch
PREREQUISITE_BRANCH_NAME=_prerequisite

case $# in
    1) BRANCH="$1";;
    2) BRANCH="$1"; PREREQUISITE="$2";;
    *) echo "Usage: `basename $0` branch [prerequisite]" >&2; exit 1;;
esac

parts=($(echo "$BRANCH"|tr : '\n'))
BRANCH_REMOTE=${parts[0]}
BRANCH_NAME=${parts[1]}

# delete previous review branches
git branch -D $REVIEW_BRANCH_NAME | true
git branch -D $PREREQUISITE_BRANCH_NAME | true

git fetch $BRANCH_REMOTE $BRANCH_NAME:$REVIEW_BRANCH_NAME

if [ $PREREQUISITE ]
then
  parts=($(echo "$PREREQUISITE"|tr : '\n'))
  PREREQUISITE_REMOTE=${parts[0]}
  PREREQUISITE_NAME=${parts[1]}
  git fetch $PREREQUISITE_REMOTE $PREREQUISITE_NAME:$PREREQUISITE_BRANCH_NAME
  REBASE_BRANCH=$PREREQUISITE_BRANCH_NAME
else
  REBASE_BRANCH=master
fi

# checkout to the new branch and rebase
git checkout $REVIEW_BRANCH_NAME
git rebase $REBASE_BRANCH