Activate a virtualenv via fabric as deploy user

I want to run my fabric script locally, which will in turn, log into my server, switch user to deploy, activate the projects .virtualenv, which will change dir to the project and issue a git pull. def git_pull(): sudo('su deploy') # here i need to switch to the virtualenv run('git pull') I typically use the workon command from virtualenvwrapper which sources the activate file and the postactivate