Git script for updating a fork

git-update-fork

#!/bin/bash

USAGE="repository"
LONG_USAGE="git update-fork -h
        print this help message.
git update-fork repository
        Update current branch (assumed to be a fork's master branch) from the
        provided upstream repository's master branch"
SUBDIRECTORY_OK=1
. "$(git --exec-path)/git-sh-setup"

function _update_fork()
{
    if [[ $# == 1 ]]; then
        git fetch $1
        if [[ $? != 0 ]]; then
            die "Could not fetch from repository $1"
        fi
        git pull $1 HEAD:master
        if [[ $? != 0 ]]; then
            die "Could not pull from $1/master"
        fi
    else
        usage
    fi
}

_update_fork $1