Simple django fabric script for deployment

fabfile.py

import os
import sys
from fab_deploy import *
from fabric.contrib.console import confirm
from fabric.api import env, cd, prefix, local, sudo as _sudo, run as _run, hide, task, settings, abort
from fabric.contrib.files import exists, upload_template
from fabric.colors import yellow, green, blue, red
from fabric.operations import _prefix_commands, _prefix_env_vars
from contextlib import contextmanager

"""
What the fab script does: 
The script is meant to deploy a bookshop application to a digital ocean vsp (works with any vps). Server configurations are found in 
a deploy folder within the project root. Virtualenv is inside the project root as well. 

1. Prepare fresh environment - Install sudo apt-packages (nginx, php, python, python-pip)
2. Create directory
3. Clone repository
4. Create virtualenvironment
5. Install Requirements
6. Run using gunicorn, supervisor, and nginx
7. Setup Solr
8. Script for auto-update and reload

Of course, prior to using the script, make sure to update the variables. 

Upon deployment, hit fab prod deploy

Enjoy! 
"""

""" Global Configurations """
ssh_user = 'roselle'
project_dir = '/home/%s/sites' % (ssh_user)
project_name = 'bookshop'
project_root = '%s/%s' % (project_dir, project_name)
venv_path = ''
repo_url = '<project repository>'

""" DB Configurations """
db_name = 'bookshopdb'
db_user = 'bookshop'
db_pass = 'bookshop'

""" Templates """
templates = {
    "nginx": {
        "local_path": "/home/roselle/sites/bookshop/deploy/nginx/bookshop.conf",
        "remote_path": "/etc/nginx/sites-available/bookshop.conf",
        "remote_path2": "/etc/nginx/sites-enabled/bookshop.conf", 
        "reload_command": "service nginx restart",
    },
    "supervisor": {
        "local_path": "/home/roselle/sites/bookshop/deploy/supervisor/bookshop.conf",
        "remote_path": "/etc/supervisor/conf.d/bookshop.conf",
        "reload_command": "supervisorctl reload",
    },
    "gunicorn": {
        "local_path": "/home/roselle/sites/bookshop/deploy/gunicorn/gunicorn_start",
    },
    "solr": {
        "local_conf": "/home/roselle/sites/bookshop/deploy/solr/solr_conf",
        "remote_path": "/home/roselle/sites/bookshop/deploy/solr/solr-4.7.2/example/solr/collection1/conf",
    },
}

""" Global Commands """
def prod():
    env.hosts = ['[email protected]']
    env.user = 'roselle'
    env.password = 'password'

@contextmanager
def virtualenv():
    """
    Runs commands within the project's virtualenv.
    """
    with cd(project_root):
        with prefix("source venv/bin/activate"):
            yield

""" Pre-deployment Commands """
def prepare_db():
    """ Setup Postgresql Database """
    try: 
        run('sudo su - postgres psql -c "dropdb %s"' % (db_name))
        run('sudo su - postgres psql -c "dropuser %s"' % (db_user))
    except: pass
    run('sudo su - postgres psql -c "createdb %s;"' % (db_name))
    run('sudo su - postgres psql -c "createuser -P -s -d -r %s"' % (db_user))

def prepare_git():
    try: 
        local("git add -p && git commit")
        local("git push")
    except: pass

def prepare_packages():
    sudo("apt-get update")
    sudo("apt-get upgrade")
    sudo("apt-get install nginx postgresql memcached supervisor redis-server mercurial python-dev libpq-dev memcached unixodbc-dev git-core")
    # sudo("sudo apt-get install python-dev python-setuptools libtiff5-dev libjpeg8-dev zlib1g-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.6-dev tk8.6-dev python-tk")
    sudo("easy_install pip")
    sudo("pip install virtualenv")
    sudo("apt-get install uwsgi")

def prepare_server_config():
    """ prepare nginx """ 
    if exists(templates['nginx']['remote_path']):
        sudo("rm %s" % templates['nginx']['remote_path'])
        sudo("rm %s" % templates['nginx']['remote_path2'])
        
    sudo("cp %s %s" % (templates['nginx']['local_path'], templates['nginx']['remote_path']))
    sudo("ln -s %s %s" % (templates['nginx']['remote_path'], templates['nginx']['remote_path2']))
    with cd(project_root):
        if exists("deploy/logs"):
            sudo("rm -r deploy/logs")
        sudo("mkdir deploy/logs")
        sudo("touch deploy/logs/nginx-access.log")
        sudo("touch deploy/logs/nginx-error.log")
        sudo("touch deploy/logs/gunicorn.log")
    
    """ prepare uwsgi """
    # sudo("pip install uwsgi")

    # if exists(templates['uwsgi']['remote_conf']):
    #     sudo("rm -r %s" % templates['uwsgi']['remote_conf'])
    # if exists(templates['uwsgi']['remote_upstart']):
    #     sudo("rm %s" % templates['uwsgi']['remote_upstart'])
    # sudo("mkdir -p %s" % templates['uwsgi']['remote_conf'])
    # sudo("cp %s %s" % (templates['uwsgi']['local_conf'], templates['uwsgi']['remote_conf']))
    # sudo("cp %s %s" % (templates['uwsgi']['local_upstart'], templates['uwsgi']['remote_upstart']))

    """ prepare supervisor """ 
    if exists(templates['supervisor']['remote_path']):
        sudo("rm %s" % templates['supervisor']['remote_path'])
    sudo("cp %s %s" % (templates['supervisor']['local_path'], templates['supervisor']['remote_path']))
   
    with cd(project_root):
        sudo("chmod +x deploy/gunicorn/gunicorn_start")

    """ reload configurations """ 
    sudo("service nginx restart")
    sudo("service nginx reload")
    # sudo("service uwsgi start")
    sudo("supervisorctl reread")
    sudo("supervisorctl update")
    sudo("supervisorctl restart all")

def deploy():
    """ 
    Utility function for deployment: This fab script deploys your local django app 
    to your remote server using Gunicorn, Supervisor & Nginx. Addons: Solr/Haystack, Celery, 
    Redis/Memcache. 
    
    Make sure that key-based authentication between server and local is enabled (See id_rsa)
    """
    
    """ Stop all current services/processes """
    sudo("supervisorctl stop all")

    """Prepare Local"""
    prepare_git() 

    """Prepare Remote Server"""
    prepare_packages()

    """ Prepare Database """ 
    prepare_db()

    """ Create directory for project """ 
    if exists(project_dir):
        sudo("rm -r %s" % project_dir)
    run("mkdir %s" % (project_dir))

    """ Clone repository """ 
    with cd(project_dir):
        run("git clone %s" % (repo_url))

    """Setup virtualenv and install requirements"""
    with cd(project_root):
        run("virtualenv venv")
        with virtualenv():
            run("pip install -r requirements.txt")
            run("pip install gunicorn")
        run("venv/bin/python manage.py migrate")
        run("venv/bin/python manage.py syncdb")

    """ Prepare gunicorn or uwsgi & nginx """ 
    prepare_server_config()

    """ Post Deployment Configurations """
    with virtualenv():
        with cd(project_root):
            run("pip install pycountry")
            run("python manage.py oscar_populate_countries")
            run("python manage.py collectstatic")