#!/usr/bin/env python
#
# Humbug's post-receive hook.  There is a symlink
#   from /srv/git/humbug.git/hooks/post-receive
#   to   ~humbug/humbug/tools/post-receive
# on git.zulip.net.  So to deploy changes to this script, run
#
#   ssh humbug@git.zulip.net 'cd humbug; git pull'
#
# To send the Humbug notices, this script calls out to our
# for-distribution git hook (under api/integrations/); since the git
# hook needs to be in the same directory as the configuration script
# for the git hook, this means that we need to have a shared directory
# containing (a symlink to) both the the for-distribution git hook and
# the Humbug configuration; for the moment those are
# bots/githook-post-receive and bots/humbug_git_config.py,
# respectively.  We need the intermediate symlink because the git hook
# looks for its configuration in the directory that it sits in, and
# api/integrations/git/ has the example configuration.
#
#
# The "post-receive" script is run after receive-pack has accepted a pack
# and the repository has been updated.  It is passed arguments in through
# stdin in the form
#  <oldrev> <newrev> <refname>
# For example:
#  aa453216d1b3e49e7f6f98441fa56946ddcd6a20 68f7abf4e6f922807889f52bc043ecd31b79f814 refs/heads/master
#
# see contrib/hooks/ for a sample

import sys
import subprocess
from humbug_tools import check_output, ENDC, FAIL

def update_deployment(server, refname):
    return subprocess.call(["ssh", server, "--", "env", "-u", "GIT_DIR",
                            "/home/humbug/humbug-deployments/current/tools/update-deployment", refname])

def send_deployment_finished_humbug(branch, message):
    subprocess.check_call(["/home/humbug/humbug/api/bin/humbug-send", "--user=commit-bot@zulip.com",
                           "--api-key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", "--stream=commits",
                           "--site=https://staging.zulip.com",
                           u"--subject=deploy \u21D2 %s" % (branch,), "--message=%s" % (message,)])

deployments = {
    'refs/heads/prod': ('prod0.zulip.net', 'prod'),
    'refs/heads/master': ('staging.zulip.net', 'master'),
    'refs/heads/test-post-receive': None,
    }

for ln in sys.stdin:
    oldrev, newrev, refname = ln.strip().split()
    if refname in deployments:
        p = subprocess.Popen("/home/humbug/humbug/bots/githook-post-receive",
                             stdin=subprocess.PIPE)
        p.communicate(input=ln)

        if deployments[refname]:
            server, branch = deployments[refname]
            ret = update_deployment(server, branch)
            if ret == 0:
                send_deployment_finished_humbug(branch, "deployment of `%s` finished successfully!" % (newrev[:12],))
            else:
                send_deployment_finished_humbug(branch, "deployment of `%s` failed!" % (newrev[:12],))

            if newrev == '0000000000000000000000000000000000000000':
                # 0000000000000000000000000000000000000000 means we're deleting the ref
                commits = ''
            else:
                commits = check_output(["git", "log", "%s..%s" % (oldrev, newrev)])

            if '[schema]' in commits:
                print
                print FAIL + "Schema change detected!  Please make the appropriate changes manually." + ENDC
                print