An attempt at a simple sync command for git

git-sync.sh

#!/usr/bin/env bash

set -e

if [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
    echo "usage: git sync [remote-name]"
    echo
    echo "Sync's the current repository to another remote host, using git,"
    echo "but not using this repository."
    echo
    echo "You must set sync.default.repo (the path to store the repository)"
    echo "and git.default.remote (the remote repository to push to).  Example:"
    echo "$ git config --add sync.default.repo .remote-repo"
    echo "$ git config --add sync.default.remote git@hostname:/path.git"
    exit
fi

if [ -z "$1" ] ; then
    dest=default
else
    dest="$1"
fi

repo_location="$(git config --get --path sync.${dest}.repo || true)"
if [ -z "$repo_location" ] ; then
    repo_location="$(git config --get --path sync.repo || true)"
    if [ -z "$repo_location" ] ; then
        repo_location=/tmp/repos
    fi
    repo_location="${repo_location}/$(basename $(pwd))"
fi

if [ ! -e $repo_location ] ; then
    remote="$(git config --get sync.${dest}.remote || true)"
    if [ -z "$remote" ] ; then
        echo "You must set sync.${dest}.remote"
        echo "Like:"
        echo "  git config --add sync.${dest}.remote git@host.com:/path.git"
        exit 2
    fi
    echo "making git repo in $repo_location"
    mkdir -p "$(basename $repo_location)"
    git clone $remote $repo_location
fi

if [ -e .syncignore ] ; then
    rsync_option="--exclude-from=.syncignore"
else
    rsync_option=""
fi

## FIXME: should I exclude untracked files?  Seems like it

rsync $rsync_option --recursive --delete --exclude .git . $repo_location

if [ -e .syncignore ] ; then
    cat .syncignore >> $repo_location/.gitignore
fi

build_command="$(git config --get sync.${dest}.build || true)"
if [ -n "$build_command" ] ; then
    echo "Running $build_command"
    (
        cd $repo_location
        $build_command
    )
fi

version="$(git describe --always --dirty)"
(
    cd $repo_location
    adds="$(git status -s | awk '/^\?\?/ {print $2}')"
    if [ -n "$adds" ] ; then
        git add $adds
    fi
    git commit -a -m "deployment $version"
    git push
)