Fabric Package Install

fabfile.py

import ConfigParser
import os

from fabric.api import env, sudo
from fabric.contrib import files

SERVER_ROLES = ['dbmaster', 'app', 'lb', ]
env.roledefs = dict.fromkeys(SERVER_ROLES, [])

# Directory structure
PROJECT_ROOT = os.path.dirname(__file__)
CONF_ROOT = os.path.join(PROJECT_ROOT, 'conf')

def install_packages(*roles):
    """
    Install packages for the given roles.
    """
    roles = list(roles)
    if roles == ['all', ]:
        roles = SERVER_ROLES
    if 'base' not in roles:
        roles.insert(0, 'base')
    config_file = os.path.join(CONF_ROOT, u'packages.conf' % env)
    config = ConfigParser.SafeConfigParser()
    config.read(config_file)
    for role in roles:
        if config.has_section(role):
            # Get ppas
            if config.has_option(role, 'ppas'):
                for ppa in config.get(role, 'ppas').split(' '):
                    sudo(u'add-apt-repository %s' % ppa)
            # Get sources
            if config.has_option(role, 'sources'):
                for section in config.get(role, 'sources').split(' '):
                    source = config.get(section, 'source')
                    key = config.get(section, 'key')
                    files.append(u'/etc/apt/sources.list', source, use_sudo=True)
                    sudo(u"wget -q %s -O - | sudo apt-key add -" % key)
            sudo(u"apt-get update")
            sudo(u"apt-get install -y %s" % config.get(role, 'packages'))
            sudo(u"apt-get upgrade -y")

packages.conf

[base]
packages = python-software-properties dpkg-dev wget build-essential git-core subversion mercurial libnet-cidr-perl munin-node vim ntp

[app]
packages = python2.6 python-all-dev python-setuptools libmysqlclient15-dev libevent-1.4-2 libevent-core-1.4-2 libevent-extra-1.4-2 libevent-dev rabbitmq-server memcached libjpeg62 libjpeg62-dev zlib1g-dev supervisor redis-server
ppas = ppa:rwky/redis
sources = rabbitmq-source

[lb]
packages = nginx
ppas = ppa:nginx/stable

[dbmaster]
packages = mysql-server mysql-common mysql-client

[rabbitmq-source]
source = deb http://www.rabbitmq.com/debian/ testing main
key = http://www.rabbitmq.com/rabbitmq-signing-key-public.asc