batou

#!/usr/bin/env python2.7
#
# This file is managed by batou. Don't edit directly. Use the './batou update'
# command to adjust versions.
#
# This file is intended to be as small as possible getting batou working
# somehow and then use that code to continue.

import os
import shutil
import sys
import subprocess

# We use this to trick the simple templating so you can
# download and copy this file to bootstrap a new batou installation.
BOOTSTRAP_VERSION_MARKER = '{' + '{version}' + '}'

version = os.environ.get('BATOU_VERSION', '')
develop = os.environ.get('BATOU_DEVELOP', 'hg+https://bitbucket.org/flyingcircus/batou#egg=batou')


def cmd(c, quiet=False):
    try:
        subprocess.check_output([c], stderr=subprocess.PIPE, shell=True)
    except subprocess.CalledProcessError as e:
        if not quiet:
            print("{} returned with exit code {}".format(c, e.returncode))
            print(e.output)
        raise


def install_venv():
    print('Preparing virtualenv in .batou ...')
    # Discover the right venv cmd. Or let batou figure that out later in a
    # second phase?
    # XXX Give advice if virtualenv isn't there.
    cmd('virtualenv --python=python2.7 .batou')


def install_pip():
    # XXX give advice if we can't get the right pip version
    cmd('.batou/bin/pip install "pip>=1.2"')


base = os.path.dirname(__file__) or '.'
os.chdir(base)

# Do we have a virtualenv?
if not os.path.exists(base + '/.batou'):
    install_venv()


def prepare():
    global version, develop

    try:
        install_pip()
    except Exception:
        # Hum. This venv is probably broken. Remove and restart."
        shutil.rmtree('.batou')
        install_venv()
        install_pip()

    try:
        cmd('.batou/bin/python -c \'import batou.bootstrap\'', quiet=True)
    except Exception:
        missing = True
    else:
        missing = False

    if missing or develop:
        if version == BOOTSTRAP_VERSION_MARKER:
            # we're bootstrapping a new project. just get whatever version.
            # this will self-destruct this file later. :)
            develop = ''
            spec = '--egg batou'
        if missing:
            print('Pre-installing batou - this can take a while...')
        if develop:
            spec = '-e {}'.format(develop)
        else:
            spec = '--egg batou=={}'.format(version)

        cmd('.batou/bin/pip install --ignore-installed {}'.format(spec))


if '--fast' not in sys.argv:
    prepare()


os.environ['BATOU_VERSION'] = version
os.environ['BATOU_DEVELOP'] = develop


# Pass control over the bare-bone batou's bootstrapping code. Good luck!
os.execv('.batou/bin/python',
         ['.batou/bin/python', '-c',
          'import batou.bootstrap; batou.bootstrap.bootstrap()'] + sys.argv)