Hello @enough-analyst-54434, sorry to bother, one of my coworkers is trying to use pants in his machine, but gets a weird permission error (no bug on my end with the same repo):

17:16:29 00:02   [pyprep]
17:16:29 00:02     [interpreter]
17:16:29 00:02     [build-local-dists]
17:16:29 00:02     [requirements]
17:16:29 00:02       [cache]
                   No cached artifacts for 20 targets.
                   Invalidated 20 targets.pex: Resolving for:
pex: Isolating pex in Chroot(/var/folders/ty/mh344wcn4z1gdf_nm_nht80h0000gn/T/tmpodrznp4n {fs:}): 187.2ms
  ERROR: Command errored out with exit status 1:
   command: /Library/Developer/CommandLineTools/usr/bin/python3 /var/folders/ty/mh344wcn4z1gdf_nm_nht80h0000gn/T/tmpodrznp4n/pex/vendor/_vendored/pip/pip install --ignore-installed --no-user --prefix /private/var/folders/ty/mh344wcn4z1gdf_nm_nht80h0000gn/T/pip-build-env-9zw3xco9/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i <https://pypi.org/simple/> -- 'numpy>=1.17.3' 'Cython>=0.29.14' setuptools wheel
       cwd: None
  Complete output (13 lines):
  Looking in indexes: <https://pypi.org/simple/>
  Collecting numpy>=1.17.3
    Using cached <https://files.pythonhosted.org/packages/2f/5b/2cc2b9285e8b2ca8d2c1e4a2cbf1b12d70a2488ea78170de1909bca725f2/numpy-1.18.1-cp37-cp37m-macosx_10_9_x86_64.whl>
  Collecting Cython>=0.29.14
    Using cached <https://files.pythonhosted.org/packages/9b/e6/6e30303d7bc17289411d82276b7338a1781964171c94f5ebe689cbecad4c/Cython-0.29.14-cp37-cp37m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl>
  Collecting setuptools
    Using cached <https://files.pythonhosted.org/packages/af/e7/02db816dc88c598281bacebbb7ccf2c9f1a6164942e88f1a0fded8643659/setuptools-45.0.0-py2.py3-none-any.whl>
  Collecting wheel
    Using cached <https://files.pythonhosted.org/packages/00/83/b4a77d044e78ad1a45610eb88f745be2fd2c6d658f9798a15e384b7d57c9/wheel-0.33.6-py2.py3-none-any.whl>
  Installing collected packages: numpy, Cython, setuptools, wheel
  ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/Library/Python/3.7/site-packages/numpy/conftest.py'
  Consider using the `--user` option or check the permissions.

Ah, this unfortunately doesn’t work yet but is very close to being fixed. Recently, John changed Pex to vendor Pip so that it has support for things like Pep 517/518. That’s in the Pex 2.x series Pants is still using Pex 1.x, but John’s #1 issue he’s been working on is upgrading Pants to 2.x

ah yes I know, I'm using pants

1.24.0.dev2

which uses

pex=2.0.0

with vendored pip, before the reverse commit haha

Awesome. John may ask you questions when he’s online to figure out if Pex needs to handle this case, but glad to hear it’s resolved!

The issue you hit in Pex 2.0.0 may have been fixed by https://github.com/pantsbuild/pex/pull/828 which is part of Pex 2.1.0. That PR dogfoods pex to run pip in an isolated environment: https://github.com/pantsbuild/pex/pull/828/files#diff-77bac56887c1a03806e247fe60c2024cR25

ah yes cool, any ETA for when it will be available in pants?