Convert any directory into a git-based directory preserving original, non-intersecting, files

gitify-dir

#!/bin/bash

# To backup a directory, and then replace it with a git version
# that is already available remotely

# Conflicting file versions will be overwritten with the remote version
# Files which existed locally but not in the git repo will be preserved (*not* removed)
set -e

PATH=/sbin:/usr/sbin:/usr/local/sbin:/bin:/usr/bin:/usr/local/bin:$PATH

dest="$1"
origin="$2"
branch="$3"

if [ -z "$dest" -o -z "$origin" -o -z "$branch" ]; then
    echo "usage: $0 destination-path origin branch"
    echo "example: $0 /path/to/destination git@git.server.example.com:my-repo.git master"
    exit 99
fi

if [ ! -d "$dest" ]; then
    echo "$dest does not exist or is not a directory"
    exit 98
fi

if [ -d "$dest/.git" ]; then
    echo "$dest is already a git directory. aborting"
    exit 97
fi

rsync -av "$dest/" "$dest.non-git"
cd "$dest"
git init
git checkout -b "$branch"
git remote add origin "$origin"
git fetch
git reset --hard "origin/$branch"