Commit e2bbad10 authored by Xavier Thompson's avatar Xavier Thompson

[feat] Prevent pip installing setup_requires

Use a special .pydistutils.cfg in a temporary HOME directory for
the duration of the pip wheel run to prevent build dependencies
specified in a setup_requires from being installed on the fly
without respecting pinned versions.
parent ec8ec89a
......@@ -18,6 +18,7 @@ It doesn't install scripts. It uses setuptools and requires it to be
installed.
"""
import atexit
import copy
import distutils.errors
import distutils.sysconfig
......@@ -1731,6 +1732,13 @@ class IncompatibleConstraintError(zc.buildout.UserError):
IncompatibleVersionError = IncompatibleConstraintError # Backward compatibility
# Temporary HOME with .pydistutils.cfg to disable setup_requires
pip_pydistutils_home = tempfile.mkdtemp('pip-pydistutils-home')
with open(os.path.join(pip_pydistutils_home, '.pydistutils.cfg'), 'w') as f:
f.write("[easy_install]\n"
"index-url = file:///dev/null")
atexit.register(zc.buildout.rmtree.rmtree, pip_pydistutils_home)
def call_pip_wheel(spec, dest, options):
"""
Call `pip wheel` from a subprocess to install a
......@@ -1744,8 +1752,10 @@ def call_pip_wheel(spec, dest, options):
else:
args.append('-v')
# Try to prevent pip from installing build dependencies implicitly
# and without respecting pinned versions, on the fly
# Prevent pip from installing build dependencies on the fly
# without respecting pinned versions. This only works for
# PEP 517 specifications using pyproject.toml and not for
# dependencies in setup_requires option in legacy setup.py
if not options._allow_picked_versions:
args.append('--no-index')
args.append('--no-build-isolation')
......@@ -1779,7 +1789,14 @@ def call_pip_wheel(spec, dest, options):
sys.stdout.flush() # We want any pending output first
subprocess.check_call(list(args), env=env)
# Prevent setuptools from downloading and thus installing
# build dependencies specified in setup_requires option of
# legacy setup.py by providing a crafted .pydistutils.cfg.
# This is used in complement to --no-build-isolation.
if not options._allow_picked_versions:
env['HOME'] = pip_pydistutils_home
subprocess.check_call(args, env=env)
entries = os.listdir(dest)
try:
......
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