Just an idea for a "Capistrano style" deploy setup

atomic_deploy.sh

#!/usr/bin/env bash

# BASE (required) - Releases are stored here.
# TARGET (required) - This will be a symlink to the current release.
# REPO (required) - The address to your Git repo.
# KEEP - How many latest releases to keep around (default is 10).
#
# Example:
#
# BASE=/var/www/foo/releases TARGET=/var/www/foo/public_html REPO=git@github.com:foo/bar.git ./atomic_deploy.sh 2b5d4a

set -ex

if [[ $(id -u) > 0 ]]; then
    echo -e "\e[101m\e[1m This script must be run as root or sudo! \e[0m\e[49m"
    exit 1
fi

COMMIT_HASH=${1-master}
THIS_RELEASE="$BASE/$COMMIT_HASH"

# already the current release - do nothing
if [ "$(readlink -- "$TARGET")" = $THIS_RELEASE ]; then
    echo -e "\e[106m\e[30m\e[1m $COMMIT_HASH is already the current release! \e[0m\e[39m\e[49m"
    exit 0
fi

# ensure we have target dirs
mkdir -p $BASE
chown -R apache:apache $BASE

# skip if we already have this release on hand
if [ ! -d $THIS_RELEASE ] || [ ! "$(ls -A $THIS_RELEASE)" ]; then

    if [ -d $BASE/.cache ]; then
        # use a cached repo if we have it
        echo -e "\e[107m\e[30m\e[1m Using cached repo... \e[0m\e[39m\e[49m"
        cp -a $BASE/.cache $THIS_RELEASE
        cd $THIS_RELEASE
        su -s /bin/bash apache -c "git fetch --all && git reset --hard origin/master"
    else
        # otherwise create one from scratch
        rm -f $THIS_RELEASE
        mkdir -p $THIS_RELEASE
        chown -R apache:apache $THIS_RELEASE
        # clone as apache
        su -s /bin/bash apache -c "git clone $REPO $THIS_RELEASE"
    fi

    # checkout the target commit
    cd $THIS_RELEASE
    git checkout $COMMIT_HASH

    # update the cached copy of this repo
    cp -a $THIS_RELEASE $BASE/.cache

    # EVERYTHING STOPS HERE IF THE TESTS FAIL

    # remove distignore files
    cat .distignore | xargs rm -rf | bash
    rm -f .distignore
else
    echo -e "\e[107m\e[30m\e[1m Release already exists, rolling back... \e[0m\e[39m\e[49m"
fi

# release via symlink and atomic move "Capistrano style"
ln -s $THIS_RELEASE $BASE/current
chown -R apache:apache $BASE/current
mv -f $BASE/current $TARGET

# keep the 10 most recent releases, trim the rest
cd $BASE
ls -dtr */ | head -n -10 | xargs --no-run-if-empty rm -rf

# done
echo -e "\e[102m\e[30m\e[1m $COMMIT_HASH DEPLOYED \e[0m\e[39m\e[49m"