GIt deployment script

gistfile1.sh

#!/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
GIT=/usr/bin/git
USER=www-data
GROUP=www-data
BASE_DIR="/var/www"
HTML_DIR="public_html"
GIT_DIRNAME=".git"
LOG_FILENAME="deploy.log"
ME=`whoami`

execute () {
    if [ $ME == $USER ]; then
        /bin/bash -c "$1" 2>&1
    else
        su - $USER -c "$1" 2>&1
    fi
}

usage () {
    
    echo "";
    echo "For inititlize new project use: "$0" init <project_name> <remote_uri>";
    echo "For upgrade project from tag: "$0" upgrade <project_name> tags/<tag_name>";
    echo "For upgrade project from branch: "$0" upgrade <project_name> <remote>/<branch>";
    echo "";
    
}

upgrade () {
    PROJECT_NAME=$1
    PARAMS=$2
    WORK_TREE_DIR=$BASE_DIR"/"$PROJECT_NAME"/"$HTML_DIR
    GIT_DIR=$BASE_DIR"/"$PROJECT_NAME"/"$GIT_DIRNAME
    LOG_FILE=$BASE_DIR"/"$PROJECT_NAME"/"$LOG_FILENAME

    if [ -d $GIT_DIR ]; then      
        execute "$GIT --work-tree=$WORK_TREE_DIR --git-dir=$GIT_DIR fetch --all >> $LOG_FILE" 
        execute "$GIT --work-tree=$WORK_TREE_DIR --git-dir=$GIT_DIR checkout -f $PARAMS >> $LOG_FILE"
    else
      echo "Peoject git dir not found in "$GIT_DIR
    fi
}

initialize () {
    PROJECT_NAME=$1
    PARAMS=$2
    WORK_TREE_DIR=$BASE_DIR"/"$PROJECT_NAME"/"$HTML_DIR
    GIT_DIR=$BASE_DIR"/"$PROJECT_NAME"/"$GIT_DIRNAME
    LOG_FILE=$BASE_DIR"/"$PROJECT_NAME"/"$LOG_FILENAME

    if [ ! $PARAMS ]; then
        echo "Please provide remote uri!"
        usage
        exit
    fi

    if [ -d $GIT_DIR ]; then
        echo "Project already initialized in "$BASE_DIR"/"$PROJECT_NAME
        exit
    fi

    if [ ! -d $WORK_TREE_DIR ]; then
        execute "mkdir -p $WORK_TREE_DIR"
    fi
    if [ ! -d $GIT_DIR ]; then
        execute "mkdir -p $GIT_DIR"
    fi

    execute "$GIT --work-tree=$WORK_TREE_DIR --git-dir=$GIT_DIR init"
    execute "$GIT --work-tree=$WORK_TREE_DIR --git-dir=$GIT_DIR remote add origin $PARAMS"

    if [ -d $GIT_DIR ]; then
        echo "New project initialized in "$BASE_DIR"/"$PROJECT_NAME
    fi
}

case "$1" in
  
  start)
    echo 'Nothing to do.'
    ;;

  stop)
    echo 'Nothing to do.'
    ;;
  init)
    echo 'Trying to initialize new project from git.'
    initialize $2 $3
    ;;
  upgrade)
    echo 'Upgrade project from git.'
    upgrade $2 $3
    ;;

  restart)
    $0 stop
    $0 start
    ;;
  *)
    usage $0
;;
esac