Activate a virtualenv via fabric as deploy user

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As an update to bitprophet’s forecast: With Fabric 1.0 you can make use of prefix() and your own context managers.

from __future__ import with_statement
from fabric.api import *
from contextlib import contextmanager as _contextmanager

env.hosts = ['servername']
env.user="deploy"
env.keyfile = ['$HOME/.ssh/deploy_rsa']
env.directory = '/path/to/virtualenvs/project'
env.activate="source /path/to/virtualenvs/project/bin/activate"

@_contextmanager
def virtualenv():
    with cd(env.directory):
        with prefix(env.activate):
            yield

def deploy():
    with virtualenv():
        run('pip freeze')

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