pip-bundle custom

pip-bundle.py

# -*- coding: utf-8 -*-
#
# Copyright 2015 Develer S.r.l. (http://www.develer.com/)
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
# See also:
# https://pip.pypa.io/en/latest/user_guide.html#create-an-installation-bundle-with-compiled-dependencies
#

from subprocess import check_call as call
import argparse
import contextlib
import glob
import os
import os.path
import shutil
import sys
import tempfile
import zipfile


if not hasattr(zipfile.ZipFile, "__enter__"):
	# Monkey patch ZipFile for Python 2.6 (which is still being used on CentOS 6)
	zipfile.ZipFile.__enter__ = lambda self: self
	zipfile.ZipFile.__exit__ = lambda self, *args: self.close()


def main():
	args = parse_args()

	if args.subcommand == "create":
		bundle_create(args.bundle, args.requirements)
	elif args.subcommand == "install":
		bundle_install(args.bundle)
	elif len(sys.argv) == 1:
		pass # where I would use args.print_help()
	else:
		print("Programmer error")
		sys.exit(1)


def parse_args():
	#parser = argparse.ArgumentParser()
	class ArgumentParserWithDefaults(argparse.ArgumentParser):
		def add_argument(self, *args, help=None, default=None, **kwargs):
			if help is not None:
				kwargs['help'] = help
			if default is not None and args[0] != '-h':
				kwargs['default'] = default
				if help is not None:
					kwargs['help'] += ' Default: {}'.format(default)
			super().add_argument(*args, **kwargs)

	parser = ArgumentParserWithDefaults(formatter_class=argparse.RawTextHelpFormatter)
	subcommands = parser.add_subparsers(dest="subcommand")

	parse_create = subcommands.add_parser("create")
	parse_create.add_argument("bundle", default="bundle.pip-bundle", nargs="?", help='''my help for a''')
	parse_create.add_argument("-r", "--requirements", default="requirements.txt", help='''my help for a''')

	parse_install = subcommands.add_parser("install")
	parse_install.add_argument("bundle", default="bundle.pip-bundle", nargs="?", help='''my help for a''')

	return parser.parse_args()


def bundle_create(bundle_file, requirements):
	if not os.path.isabs(bundle_file):
		bundle_file = os.path.join(os.getcwd(), bundle_file)

	with create_tempdir() as tempdir:
		call(["pip", "wheel", "-r", requirements, "--wheel-dir=" + tempdir])

		with pushd(tempdir):
			mkzip(bundle_file, glob.glob("*.whl"))


def bundle_install(bundle_file):
	if not os.path.isfile(bundle_file):
		print("{0}: No such file, cannot install bundle.".format(bundle_file))
		sys.exit(1)

	with create_tempdir() as tempdir:
		unzip(bundle_file, tempdir)

		with pushd(tempdir):
			call(["pip", "install", "--force-reinstall", "--ignore-installed",
				  "--upgrade", "--no-index", "--no-deps"] + glob.glob("*.whl"))


def mkzip(archive, files):
	with zipfile.ZipFile(archive, "w") as zf:
		for f in files:
			zf.write(f)


def unzip(archive, where):
	with zipfile.ZipFile(archive, "r") as zf:
		zf.extractall(where)


@contextlib.contextmanager
def create_tempdir():
	path = tempfile.mkdtemp(prefix="pip-bundle-")
	yield path
	shutil.rmtree(path)


@contextlib.contextmanager
def pushd(path):
	oldpath = os.getcwd()
	os.chdir(path)
	yield
	os.chdir(oldpath)


if __name__ == '__main__':
	main()