fabfile.py

from fabric.api import run, cd, env, sudo, local, shell_env
from fabric.contrib.files import sed


env.hosts = ['ubuntu@ec2-54-251-215-76.ap-southeast-1.compute.amazonaws.com']
env.key_filename = ['/home/noufal/.ssh/id_rsa_pratham']

app_repository = "https://github.com/PrathamBooks/frp.git"

app_base = "/opt/frp"
deployments_dir = "{0}/deployments".format(app_base)
currently_deployed_dir = "{0}/deployed".format(app_base)
version_file = "{0}/frp/frp/_version.py".format(currently_deployed_dir)
production_config_file = "/opt/config/deployed/frp/production.py"
app_production_config_file = "{0}/frp/frp/settings/production.py".format(
    currently_deployed_dir)

virtualenv_home = "/opt/frp/environments"
app_virtualenv = "frp-app"


# Remote commands
def obtain_code(tag):
    with cd(deployments_dir):
        run("rm -Rf {0}".format(tag))
        run("git clone -q {0} {1}".format(app_repository, tag))
        run("cd {0}/{1} && git checkout {1}".format(deployments_dir, tag))


def set_deployed_version(tag):
    with cd(app_base):
        run("rm -f {0}".format(currently_deployed_dir))
        run("ln -s {0}/{1} {2}".format(deployments_dir, tag,
                                       currently_deployed_dir))
        # Write version file which will get loaded by the application.
        sed(version_file, "development", tag)


def update_virtualenv(tag):
    with cd(app_base):
        run(". {0}/{1}/bin/activate && "
            "pip install -M -r {2}/requirements/production.txt".format(
                virtualenv_home, app_virtualenv, currently_deployed_dir))


def monit_restart():
    sudo("monit restart all")


def reset_database():
    with cd(currently_deployed_dir), shell_env(FRP_CONFIG="settings/production.py"):
        run(". {0}/{1}/bin/activate && python frp/manage.py resetdb".format(
            virtualenv_home, app_virtualenv))


def fix_config():
    with cd(currently_deployed_dir):
        run("ln -s {0} {1}".format(production_config_file,
                                   app_production_config_file))


# Local commands
def push_code():
    local("git push --force")
    local("git push --tags")


# Public commands
def deploy(tag, venv=False, resetdb=False):
    "Deploy the application tagged by :tag:"
    push_code()
    obtain_code(tag)
    set_deployed_version(tag)
    fix_config()
    if venv:
        update_virtualenv(tag)
    if resetdb:
        reset_database()
    monit_restart()


def rollback(tag):
    "Roll back to given tag"
    set_deployed_version(tag)
    # update_monit_config()
    monit_restart()