Shell script to setup a git repository to track dot-files. See https://developer.atlassian.com/blog/2016/02/best-way-to-store-dotfiles-git-bare-repo/

dot-config.sh

#!/bin/bash

#set -x

checkout () {
    mkdir -p .config-backup
    ${GIT} checkout $@ > /dev/null 2>&1
    if [ $? = 0 ]; then
        echo "Checked out config.";
    else
        echo "Backing up pre-existing dot files.";
        ${GIT} checkout $@ 2>&1 | egrep "^\s+.+" | awk {'print $1'} | xargs -I{} sh -c 'cp -a --parents {} .config-backup/ && rm {}'
        ${GIT} checkout $@
        if [ $? != 0 ]; then
            echo "Unable to checkout branch $@";
            exit 1
        fi
    fi;
}

MYCONF="${HOME}/.cfg/"
GIT="/usr/bin/git --git-dir=${MYCONF} --work-tree=${HOME}"

if [ -e ${MYCONF} ]; then
    echo "The directory ${MYCONF} already exists. If you wish to overwrite it, remove it first."
    exit 1
fi

# Clone repository and configure it
git clone --bare https://github.com/markcol/dot-files ${MYCONF}
${GIT} remote add origin https://github.com/markcol/dot-files
${GIT} config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
${GIT} fetch -a
${GIT} branch --set-upstream-to origin/master master
${GIT} config status.showUntrackedFiles no

# Add aliases to shell init file(s)
for file in ".profile" ".bash_profile" ".zshenv"; do
    if [ -e ${HOME}/${file} ]; then
        echo "export MYCONF=${MYCONF}" >> ${HOME}/${file}
        echo 'alias config="/usr/bin/git --git-dir=${MYCONF} --work-tree=${HOME}"' >> ${HOME}/${file}
    fi
done

if [ -e ${HOME}/.gitignore ]; then
    echo "$(basename ${MYCONF})/" >> ${HOME}/.gitignore
fi

# Create a branch for local machine if it does not exist remotely,
# otherwise track the remote branch.
BRANCH="$(hostname -s)"
if [ "$(${GIT} branch --list ${BRANCH})" = "" ]; then
    echo "Checking out files from master branch"
    checkout
    echo "Creating branch for local machine config (${BRANCH})."
    ${GIT} checkout -b ${BRANCH}
    ${GIT} push -u origin ${BRANCH}
else
    echo "Switching to local machine branch (${BRANCH})."
    ${GIT} branch --set-upstream-to origin/${BRANCH} ${BRANCH}
    checkout ${BRANCH}
fi

if [ -d ~/.config-backup ]; then
    echo "Backups of any files that have been overwritten are in ~/.config-backup"
fi

echo "Please source your shell config file to get 'config' alias."