A first cut at a fabfile that meets our App Engine deployment criteria

fabfile.py

from __future__ import with_statement

import functools
import os
import sys

from fabric.api import *

from google.appengine.api import appinfo


def with_appcfg(func):
    """Decorator that ensures the current Fabric env has a GAE app.yaml config
    attached to it."""
    @functools.wraps(func)
    def decorated_func(*args, **kwargs):
        if not hasattr(env, 'app'):
            appcfg = appinfo.LoadSingleAppInfo(open('app.yaml'))
            env.app = appcfg
        return func(*args, **kwargs)
    return decorated_func

@with_appcfg
def staging():
    """Sets the deployment target to staging."""
    env.app.application = '%s-staging' % env.app.application

@with_appcfg
def production():
    """Sets the deployment target to production."""
    pass

@with_appcfg
def deploy(git=None):
    """Deploys a fresh checkout of current git HEAD, optionally tagging the
    version with the latest git revision."""
    # Are we deploying a version tagged with the git revision? If so, update
    # the app's version string accordingly.
    if git is not None:
        gitversion = local('git rev-parse --short HEAD')
        env.app.version = '%s-%s' % (env.app.version, gitversion)

    # Where are we checking out a clean copy?
    clone = local('mktemp -d -t %s' % env.app.application)
    local('git clone . %s' % clone)

    with cd(clone):
        local('git submodule init')
        local('git submodule update')
        local('find . -name ".git*" | xargs rm -rf')
        print 'App:', env.app.application
        print 'Ver:', env.app.version
        # local('appcfg.py -A %s -V %s update .' %
        #     (env.app.application, env.app.version), capture=False)
    local('rm -r %s' % clone)