Deployment using git checkout

gistfile1.txt

#!/bin/bash
# Server deployment using git
# Created on: 2012.04.13
# Created by: Abraham Godong

GIT_PATH="/usr/bin/git"
GIT_REPO_URL=$1
GIT_BRANCH=$2
GIT_CL_DIR=$3
CL_USER=""$4

if [ -z "$GIT_REPO_URL" ]; then
        echo "GIT repository URL was not specified." >&2
        exit 1
fi

if [ -z "$GIT_CL_DIR" ]; then
        echo "Destination directory was not specified." >&2
        exit 1
fi

if [ ! -x "$GIT_PATH" ]; then
        apt-get -q -y install git-core
    if [ ! -x "$GIT_PATH" ]; then
            echo "$GIT_PATH is not executable (git is not installed)" >&2
            exit 1
    fi
fi
if [ -d "$GIT_CL_DIR"/.git ]; then
    cd "$GIT_CL_DIR"
    if $GIT_PATH status >/dev/null 2>&1; then
        echo "Trying to fetch from all repositories" >&2
        $GIT_PATH fetch --all
        GIT_REVISION=$($GIT_PATH rev-list $GIT_BRANCH | head -1)
        echo "Trying to switch to the right edition: $GIT_REVISION" >&2
        $GIT_PATH checkout -f $GIT_REVISION
        echo "Trying to chown everything" >&2
        chown -R $CL_USER:$CL_USER $GIT_CL_DIR
        echo "Everything looks good!" >&2
        exit 0
    fi
else
    echo "Git does not exist yet!"
fi

echo "All activities done!"