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import glob
import os
import subprocess
import sys
import tempfile
from distutils import log
from distutils.errors import DistutilsError
import pkg_resources
from setuptools.wheel import Wheel
def _fixup_find_links(find_links):
"""Ensure find-links option end-up being a list of strings."""
if isinstance(find_links, str):
return find_links.split()
assert isinstance(find_links, (tuple, list))
return find_links
def fetch_build_egg(dist, req): # noqa: C901 # is too complex (16) # FIXME
"""Fetch an egg needed for building.
Use pip/wheel to fetch/build a wheel."""
# Warn if wheel is not available
try:
pkg_resources.get_distribution('wheel')
except pkg_resources.DistributionNotFound:
dist.announce('WARNING: The wheel package is not available.', log.WARN)
# Ignore environment markers; if supplied, it is required.
req = strip_marker(req)
# Take easy_install options into account, but do not override relevant
# pip environment variables (like PIP_INDEX_URL or PIP_QUIET); they'll
# take precedence.
opts = dist.get_option_dict('easy_install')
if 'allow_hosts' in opts:
raise DistutilsError('the `allow-hosts` option is not supported '
'when using pip to install requirements.')
quiet = 'PIP_QUIET' not in os.environ and 'PIP_VERBOSE' not in os.environ
if 'PIP_INDEX_URL' in os.environ:
index_url = None
elif 'index_url' in opts:
index_url = opts['index_url'][1]
else:
index_url = None
find_links = (
_fixup_find_links(opts['find_links'][1])[:] if 'find_links' in opts
else []
)
if dist.dependency_links:
find_links.extend(dist.dependency_links)
eggs_dir = os.path.realpath(dist.get_egg_cache_dir())
environment = pkg_resources.Environment()
for egg_dist in pkg_resources.find_distributions(eggs_dir):
if egg_dist in req and environment.can_add(egg_dist):
return egg_dist
with tempfile.TemporaryDirectory() as tmpdir:
cmd = [
sys.executable, '-m', 'pip',
'--disable-pip-version-check',
'wheel', '--no-deps',
'-w', tmpdir,
]
if quiet:
cmd.append('--quiet')
if index_url is not None:
cmd.extend(('--index-url', index_url))
for link in find_links or []:
cmd.extend(('--find-links', link))
# If requirement is a PEP 508 direct URL, directly pass
# the URL to pip, as `req @ url` does not work on the
# command line.
cmd.append(req.url or str(req))
try:
subprocess.check_call(cmd)
except subprocess.CalledProcessError as e:
raise DistutilsError(str(e)) from e
wheel = Wheel(glob.glob(os.path.join(tmpdir, '*.whl'))[0])
dist_location = os.path.join(eggs_dir, wheel.egg_name())
wheel.install_as_egg(dist_location)
dist_metadata = pkg_resources.PathMetadata(
dist_location, os.path.join(dist_location, 'EGG-INFO'))
dist = pkg_resources.Distribution.from_filename(
dist_location, metadata=dist_metadata)
return dist
def strip_marker(req):
"""
Return a new requirement without the environment marker to avoid
calling pip with something like `babel; extra == "i18n"`, which
would always be ignored.
"""
# create a copy to avoid mutating the input
req = pkg_resources.Requirement.parse(str(req))
req.marker = None
return req
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