Easily keep master in sync with upstream.

gittyup.sh

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##                                                                                ##
##  gittyup() - Easily keep master in sync with upstream.                         ##
##                                                                                ##
##         Author: Evan Coury, http://blog.evan.pro/                              ##
##            URL: https://gist.github.com/1506822                                ##
##                                                                                ##
##  This bash function is a simple shortcut for keeping your local (and public    ##
##  fork / origin remote) master branch up to date and in sync with the upstream  ##
##  master. To use gittyup(), simply drop this in your ~/.bashrc.                 ##
##                                                                                ##
##  A few assumptions are made:                                                   ##
##                                                                                ##
##  - The remote you are updating from is named upstream.                         ##
##  - You have a remote named origin that you can push to.                        ##
##  - You always work in topic branches and your local master branch has not      ##
##    diverged from the upstream master.                                          ##
##                                                                                ##
##  gittyup() performs all of the following tasks for you:                        ##
##                                                                                ##
##  0. Verify that you are in a valid Git repo.                                   ##
##  1. Remember which branch you are on.                                          ##
##  2. Stash any uncommitted changes you have.                                    ##
##  3. Checkout master.                                                           ##
##  4. Fetch all remotes. (nice to track other remotes)                           ##
##  5. Merge upstream/master into local master (FF ONLY!)                         ##
##  6. Push your updated local master branch to origin.                           ##
##  7. Check out the branch you were previously on.                               ##
##  8. Applies any stashed changes and index status.                              ##
##                                                                                ##
##  It _should_ be safe to run gittyup() in any repo where the assumptions above  ##
##  hold true. You can run gittyup() even when your repository is in a dirty      ##
##  state (uncommitted / unstaged changes) and regardless of which branch you     ##
##  are working in. After gittyup() is finished, it will return you to the        ##
##  branch you were working in and restore your working tree and index to the     ##
##  exact state it was in before running gittyup().                               ##
##                                                                                ##
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function gittyup()
{
    local gitCheck=$(git log -n1 2>&1 1>/dev/null | wc -l)
    if [[ ! $gitCheck -eq 0 ]]; then
        echo "Error: You're not in a Git repository"
        return
    fi
    local currentBranch=$(git branch | grep \* | cut -d' ' -f2)
    local stashed=$(git stash | grep -v 'No local changes' | wc -l)
    if [[ ! $stashed -eq 0 ]]; then
        echo "Your working copy has uncommitted changes..."
        echo -e "These changes have been stashed and will be re-applied when we're done.\n"
    fi
    if [[ $currentBranch != 'master' ]]; then
        git checkout master
    fi
    git fetch --all
    git merge upstream/master --ff-only
    git push origin master

    if [[ $currentBranch != 'master' ]]; then
        git checkout $currentBranch
    fi
    if [[ ! $stashed -eq 0 ]]; then git stash pop --index; fi
}