fabric file to upgrade nginx in remote host

fabfile.py

from __future__ import with_statement
from fabric.api import *
from posixpath import basename

version = "1.5.7"
what="http://nginx.org/download/nginx-%s.tar.gz" % version
prefix="/opt/nginx"
opt = "--prefix=/opt/nginx --with-openssl=../openssl-1.0.1e --with-pcre --with-http_ssl_module --with-http_spdy_module --with-http_stub_status_module --with-ipv6 --with-http_image_filter_module"

env.hosts = [""]
env.user=""

def upgrade():
    pkg = basename(what)
    dirname = pkg[0:-7]
    run("wget %s" % what)
    run("tar -xf %s" % pkg)
    with cd(dirname):
        run("./configure %s" % configOpts())
        run("make")
        run("make install")
    ngx_restart()
    status()


def status():
    run("%s/sbin/nginx -V" % prefix)
    run("/opt/service/supervisorctl status nginx")

def ngx_restart():
    test = run("%s/sbin/nginx -t" % prefix).return_code
    if test == 0:
        run("/opt/service/supervisorctl restart nginx")

def version():
    run("%s/sbin/nginx -v" % prefix)

def configOpts():
    result = run("%s/sbin/nginx -V" % prefix)
    return result.split('\n')[-1][21:]