Skeleton for point-release from git

fabfile.py

def deploy():
    env.release = time.strftime('%Y%m%d%H%M%S')
    upload_tar_from_git()
    symlink_current_release()
    restart_webserver()
    
def deploy_version(version):
    "Specify a specific version to be made live"
    require('hosts', provided_by=[localhost,webserver])
    require('releases')
    env.version = version
    current_to_previous()
    run('ln -s %(releases)s/%(version)s %(current)s' % env, pty=True)
    restart_webserver()

def current_to_previous():
    if files.exists(env.previous):
        run('rm %(previous)s' % env, pty=True)
    if files.exists(env.current):
        run('mv %(current)s %(previous)s' % env, pty=True)
    
def rollback():
    """
    Limited rollback capability. Simple loads the previously current
    version of the code. Rolling back again will swap between the two.
    """
    require('hosts', provided_by=[localhost,webserver])
    require('releases', provided_by=[default])
    run('mv %(current)s %(releases)s/_previous;' % env, pty=True)
    run('mv %(previous)s %(current)s;' % env, pty=True)
    run('mv %(releases)s/_previous %(previous)s;' % env, pty=True)
    restart_webserver()    
    
def upload_tar_from_git():
    "Create an archive from the current Git master branch and upload it"
    require('packages', provided_by=[default])
    require('releases', provided_by=[default])
    require('release', provided_by=[deploy])
    local('git archive --format=tar master | gzip > %(release)s.tar.gz' % env)
    run('mkdir -p %(releases)s/%(release)s' % env, pty=True)
    put('%(release)s.tar.gz' % env, '%(packages)s/' % env)
    run('cd %(releases)s/%(release)s && tar zxf %(packages)s/%(release)s.tar.gz' % env, pty=True)
    local('rm %(release)s.tar.gz' % env)
    
def symlink_current_release():
    "Symlink our current release"
    require('release', provided_by=[deploy])
    require('releases', provided_by=[default])
    current_to_previous()
    run('ln -s %(releases)s/%(release)s %(current)s' % env)