Can't install black==20.8b1 using pypiDataRev from 2021-03-06T08:13:08Z

[rolfschr]

Hi,

the following derivation can't be built:

let
  mach-nix = import (builtins.fetchGit {
    url = "https://github.com/DavHau/mach-nix/";
    ref = "refs/tags/3.1.1";
  }) {
    python = "python38";

    pypiDataRev =
      "499750266bb4b2840cbe856c2cc0e3297685e362"; # 2021-03-06T08:13:08Z
    pypiDataSha256 = "188g24k8pk4lgqybywimkvwjwh8014v6l2mrkvzv309882i9p5gc";
  };
in mach-nix.mkPython {
  requirements = ''
    black==20.8b1
  '';
}

Result is

$ nix --print-build-logs build
...
python3.8-black> Finished executing pipInstallPhase                                                                                                                                                                
python3.8-black> post-installation fixup                                                                                                                                                                           
python3.8-black> shrinking RPATHs of ELF executables and libraries in /nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1                                                                           
python3.8-black> strip is /nix/store/p3kn26g5nhmx6spn37ar3mn0xjbzks3g-binutils-2.31.1/bin/strip                                                                                                                    
python3.8-black> stripping (with command strip and flags -S) in /nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/lib  /nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/bin     
python3.8-black> patching script interpreter paths in /nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1                                                                                           
python3.8-black> checking for references to /build/ in /nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1...
python3.8-black> Rewriting #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6/bin/python3.8 to #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6
python3.8-black> wrapping `/nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/bin/black'...
python3.8-black> Rewriting #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6/bin/python3.8 to #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6
python3.8-black> wrapping `/nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/bin/blackd'...
python3.8-black> Rewriting #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6/bin/python3.8 to #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6
python3.8-black> wrapping `/nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/bin/black-primer'...
python3.8-black> Executing pythonRemoveTestsDir
python3.8-black> Finished executing pythonRemoveTestsDir
python3.8-black> pythonCatchConflictsPhase
python3.8-black> Found duplicated packages in closure for dependency 'setuptools-scm':
python3.8-black> setuptools-scm 4.1.2 (/nix/store/mzxxiwvr1a65h3q5i2b2khbn7kv60762-python3.8-setuptools_scm-4.1.2/lib/python3.8/site-packages)
python3.8-black> setuptools-scm 5.0.2 (/nix/store/ga9ya0mnkm0gxcjqzflpyi5z0ig6l737-python3.8-setuptools-scm-5.0.2/lib/python3.8/site-packages)
python3.8-black> Package duplicates found in closure, see above. Usually this happens if two packages depend on different version of the same dependency.
builder for '/nix/store/wc93r13n88v8mba04fvlkn73n587h8jm-python3.8-black-20.8b1.drv' failed with exit code 1; last 10 log lines:
  Rewriting #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6/bin/python3.8 to #!/nix/store/5aq2ix4vmk8bxs20ddqi48vc4bnk8zr5-python3-3.8.6
  wrapping `/nix/store/jkrc58h8nkhxnaj7w267vqdwf4cl0izs-python3.8-black-20.8b1/bin/black-primer'...
  Executing pythonRemoveTestsDir
  Finished executing pythonRemoveTestsDir
  pythonCatchConflictsPhase
  Found duplicated packages in closure for dependency 'setuptools-scm': 
    setuptools-scm 4.1.2 (/nix/store/mzxxiwvr1a65h3q5i2b2khbn7kv60762-python3.8-setuptools_scm-4.1.2/lib/python3.8/site-packages)
    setuptools-scm 5.0.2 (/nix/store/ga9ya0mnkm0gxcjqzflpyi5z0ig6l737-python3.8-setuptools-scm-5.0.2/lib/python3.8/site-packages)
                                                    
  Package duplicates found in closure, see above. Usually this happens if two packages depend on different version of the same dependency.
cannot build derivation '/nix/store/lxqidnch8fv31bz1bcz5128hsglvh7fv-python3-3.8.6-env.drv': 1 dependencies couldn't be built
error: --- Error ------------------------------------------------------------------------------------ nix
build of '/nix/store/lxqidnch8fv31bz1bcz5128hsglvh7fv-python3-3.8.6-env.drv' failed

I somehow feel this is not the 'fault' of mach-nix, though. Maybe this gets fixed by a newer pypi-deps-db version?

[bjornfor]

@rolfschr: I think that issue is fixed on master, ref. #208.

[InLaw]

psf/black#1847

[rolfschr]

@bjornfor Yes, thanks. Using a newer version (>3.1.1) worked.