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#!/usr/bin/env python
"""A small script that can act as a trust root for installing pip >=8
Embed this in your project, and your VCS checkout is all you have to trust. In
a post-peep era, this lets you claw your way to a hash-checking version of pip,
with which you can install the rest of your dependencies safely. All it assumes
is Python 2.6 or better and *some* version of pip already installed. If
anything goes wrong, it will exit with a non-zero status code.
"""
# This is here so embedded copies are MIT-compliant:
# Copyright (c) 2016 Erik Rose
#
# 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.
from __future__ import print_function
from distutils.version import StrictVersion
from hashlib import sha256
from os import environ
from os.path import join
from pipes import quote
from shutil import rmtree
try:
from subprocess import check_output
except ImportError:
from subprocess import CalledProcessError, PIPE, Popen
def check_output(*popenargs, **kwargs):
if 'stdout' in kwargs:
raise ValueError('stdout argument not allowed, it will be '
'overridden.')
process = Popen(stdout=PIPE, *popenargs, **kwargs)
output, unused_err = process.communicate()
retcode = process.poll()
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
raise CalledProcessError(retcode, cmd)
return output
from sys import exit, version_info
from tempfile import mkdtemp
try:
from urllib2 import build_opener, HTTPHandler, HTTPSHandler
except ImportError:
from urllib.request import build_opener, HTTPHandler, HTTPSHandler
try:
from urlparse import urlparse
except ImportError:
from urllib.parse import urlparse # 3.4
__version__ = 1, 5, 1
PIP_VERSION = '9.0.1'
DEFAULT_INDEX_BASE = 'https://pypi.python.org'
# wheel has a conditional dependency on argparse:
maybe_argparse = (
[('18/dd/e617cfc3f6210ae183374cd9f6a26b20514bbb5a792af97949c5aacddf0f/'
'argparse-1.4.0.tar.gz',
'62b089a55be1d8949cd2bc7e0df0bddb9e028faefc8c32038cc84862aefdd6e4')]
if version_info < (2, 7, 0) else [])
PACKAGES = maybe_argparse + [
# Pip has no dependencies, as it vendors everything:
('11/b6/abcb525026a4be042b486df43905d6893fb04f05aac21c32c638e939e447/'
'pip-{0}.tar.gz'.format(PIP_VERSION),
'09f243e1a7b461f654c26a725fa373211bb7ff17a9300058b205c61658ca940d'),
# This version of setuptools has only optional dependencies:
('37/1b/b25507861991beeade31473868463dad0e58b1978c209de27384ae541b0b/'
'setuptools-40.6.3.zip',
'3b474dad69c49f0d2d86696b68105f3a6f195f7ab655af12ef9a9c326d2b08f8'),
('c9/1d/bd19e691fd4cfe908c76c429fe6e4436c9e83583c4414b54f6c85471954a/'
'wheel-0.29.0.tar.gz',
'1ebb8ad7e26b448e9caa4773d2357849bf80ff9e313964bcaf79cbf0201a1648')
]
class HashError(Exception):
def __str__(self):
url, path, actual, expected = self.args
return ('{url} did not match the expected hash {expected}. Instead, '
'it was {actual}. The file (left at {path}) may have been '
'tampered with.'.format(**locals()))
def hashed_download(url, temp, digest):
"""Download ``url`` to ``temp``, make sure it has the SHA-256 ``digest``,
and return its path."""
# Based on pip 1.4.1's URLOpener but with cert verification removed. Python
# >=2.7.9 verifies HTTPS certs itself, and, in any case, the cert
# authenticity has only privacy (not arbitrary code execution)
# implications, since we're checking hashes.
def opener(using_https=True):
opener = build_opener(HTTPSHandler())
if using_https:
# Strip out HTTPHandler to prevent MITM spoof:
for handler in opener.handlers:
if isinstance(handler, HTTPHandler):
opener.handlers.remove(handler)
return opener
def read_chunks(response, chunk_size):
while True:
chunk = response.read(chunk_size)
if not chunk:
break
yield chunk
parsed_url = urlparse(url)
response = opener(using_https=parsed_url.scheme == 'https').open(url)
path = join(temp, parsed_url.path.split('/')[-1])
actual_hash = sha256()
with open(path, 'wb') as file:
for chunk in read_chunks(response, 4096):
file.write(chunk)
actual_hash.update(chunk)
actual_digest = actual_hash.hexdigest()
if actual_digest != digest:
raise HashError(url, path, actual_digest, digest)
return path
def get_index_base():
"""Return the URL to the dir containing the "packages" folder.
Try to wring something out of PIP_INDEX_URL, if set. Hack "/simple" off the
end if it's there; that is likely to give us the right dir.
"""
env_var = environ.get('PIP_INDEX_URL', '').rstrip('/')
if env_var:
SIMPLE = '/simple'
if env_var.endswith(SIMPLE):
return env_var[:-len(SIMPLE)]
else:
return env_var
else:
return DEFAULT_INDEX_BASE
def main():
pip_version = StrictVersion(check_output(['pip', '--version'])
.decode('utf-8').split()[1])
has_pip_cache = pip_version >= StrictVersion('6.0')
index_base = get_index_base()
temp = mkdtemp(prefix='pipstrap-')
try:
downloads = [hashed_download(index_base + '/packages/' + path,
temp,
digest)
for path, digest in PACKAGES]
check_output('pip install --no-index --no-deps -U ' +
# Disable cache since we're not using it and it otherwise
# sometimes throws permission warnings:
('--no-cache-dir ' if has_pip_cache else '') +
' '.join(quote(d) for d in downloads),
shell=True)
except HashError as exc:
print(exc)
except Exception:
rmtree(temp)
raise
else:
rmtree(temp)
return 0
return 1
if __name__ == '__main__':
exit(main())
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