pip 10 fails to install source packages that depend on source-only package

[estyrke]

• Pip version: 10.0.0
• Python version: 3.6.3
• Operating system: Ubuntu 17.10

Description:

I'm trying to install a personal package called CvTools, which depends on pyxb, a package which has no wheels on pypi. I assume this is related to the PEP 518 stuff mentioned in #5171 (comment). However, pyxb is not required for building, so is there a way to specify this dependency in a way that pip 10 will handle?

This is the relevant portion of setup.py:

      install_requires=[
          'numpy',
          'six',
          'pyxb==1.2.6',
          'defopt',
          'opencl4py',
          'pypiwin32;platform_system=="Windows"',
          'requests',
      ],

I assume that this is because the

What I've run:

$ venv5/bin/pip install -v .
[...]
  1 location(s) to search for versions of pyxb:
  * https://pypi.python.org/simple/pyxb/
  Getting page https://pypi.python.org/simple/pyxb/
  Looking up "https://pypi.python.org/simple/pyxb/" in the cache
  Returning cached "301 Moved Permanently" response (ignoring date and etag information)
  Looking up "https://pypi.org/simple/pyxb/" in the cache
  Current age based on date: 171
  Freshness lifetime from max-age: 600
  Freshness lifetime from request max-age: 600
  The response is "fresh", returning cached response
  600 > 171
  Analyzing links from page https://pypi.org/simple/pyxb/
    Skipping link https://files.pythonhosted.org/packages/d8/24/d50e4e4b6a8dc55978dce11d5dcdb0edca2b688b4a03703a5dde2b3065ae/PyXB-base-1.0.0.tar.gz#sha256=ae5ce29446280f6aeb0948cf5955c2de3e34b209591f4dabf3fbc338ee2e6c76 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/6e/31/eb764cddadeda8a540b6e4d37a63147f4489a3dd8fcb87e40fd0d6355f21/PyXB-doc-1.0.0.tar.gz#sha256=fc0daf71f8bff07c9800cf288d1b5440c55ade23062f3eebc77c88fd36c3e15c (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/8a/09/7d534166fa5393ee827a4b4494df4dfa2e547fadd6ecad412305c407eb5d/PyXB-base-1.1.0.tar.gz#sha256=2dc82e953b5b17da32e98763221d7d5667374fd602cc5f2be9c33cd68233ef5f (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/92/b3/d9c8fbdb186fb3775ae962fe5b1052613afd57cc9a0c1d28d170ffcf2245/PyXB-full-1.1.0.tar.gz#sha256=807d2af6ee846c45aa232a3fe9c7a85ca3bda375f82b79291cd121661748f99a (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/35/6c/35951d8213d07375f8f82fdb018501559dca367ca6014a8ada1a5dfd666a/PyXB-full-1.1.3.tar.gz#sha256=d581f7dca10811ca05a16bb49553ba47631360d26075a0b8a89d20471ab5de18 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/d4/86/00419d55e487e56d3ed91deef027dfeb5cae201e87494004990725d3d535/PyXB-1.1.4.tar.gz#sha256=c147a61cc7ec4a3c51ad2617d04548b0643dcdcffe00e4622d0f02a083a888ea (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/34/72/34b47dc6583dc8a0f30bad0f7d6d73c999dfca5f99613b5190f49d37ba24/PyXB-1.1.5.tar.gz#sha256=f40b1c93118c26f97ae2bbc1b7d49844719545beed3d7182b850963409dc1fa7 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/50/c1/e26cea688c22e2c7437b5f60dfe4d14966835ca832e9e1e5f338b705bbd3/PyXB-1.2.1.tar.gz#sha256=91741e4e004703d708a896789d8cb853fdce25d136ebb1d506366c8f4adca2c0 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/0c/85/92931cca2b008826694919f5df3b3518a7e143cb2c7620041871a5eb472f/PyXB-1.2.2.tar.gz#sha256=681735c117c4eda607ea01a63eef93794bda5c5c5551b5811ee6bd79fd24fb51 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/fe/87/470910c8818daa7623be587413eda29ffde8ecfa1c823c648684cfbdc486/PyXB-1.2.3.tar.gz#sha256=af378818998bfbebaf38f759b6759d917b2b56f00620dcdc276e886af4dd672e (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/92/7b/e2629fa1c503db55242867182a6df0056fb0f5d164f2cf815adb3821c1c7/PyXB-1.2.4.tar.gz#sha256=024f9d4740fde187cde469dbe8e3c277fe522a3420458c4ba428085c090afa69 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/43/7a/9d40392e4380463f37bf5aa2851dfd8ba7c0e4d2a9dc2355177b8b785794/PyXB-1.2.5.tar.gz#sha256=4e8f62ee2cfffc37e4f40634ab9c79e0311cfaf28cf4ce5e7f4828ec56e4ff67 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
    Skipping link https://files.pythonhosted.org/packages/e3/09/4fdb190ea2b7cb43d6d3e745276ee69f4d6181be70fcbfda7df3c5f72f0e/PyXB-1.2.6.tar.gz#sha256=2a00f38dd1d87b88f92d79bc5a09718d730419b88e814545f472bbd5a3bf27b4 (from https://pypi.org/simple/pyxb/); No sources permitted for pyxb
  Could not find a version that satisfies the requirement pyxb (from versions: )
Cleaning up...
  Removing source in /tmp/pip-req-build-1tawvn8o
No matching distribution found for pyxb
Exception information:
Traceback (most recent call last):
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/basecommand.py", line 228, in main
    status = self.run(options, args)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 291, in run
    resolver.resolve(requirement_set)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/resolve.py", line 103, in resolve
    self._resolve_one(requirement_set, req)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/resolve.py", line 257, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/resolve.py", line 210, in _get_abstract_dist_for
    self.require_hashes
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 322, in prepare_linked_requirement
    abstract_dist.prep_for_dist(finder, self.build_isolation)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 148, in prep_for_dist
    _install_build_reqs(finder, prefix, build_requirements)
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 59, in _install_build_reqs
    for r in build_requirements
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 59, in <listcomp>
    for r in build_requirements
  File "/home/emil/Code/CvTools/venv5/lib/python3.6/site-packages/pip/_internal/index.py", line 533, in find_requirement
    'No matching distribution found for %s' % req
pip._internal.exceptions.DistributionNotFound: No matching distribution found for pyxb
[...]

[estyrke]

Per the comments in #5171 , I tried adding --no-build-isolation, and then it works. However, the pip command is run via tox in this case, but at least I have a lead now.

[estyrke]

Actually, this seems to be my mistake. In addition to setup.py, I also found a pyproject.toml (containing pyxb as a build requirement) that I had forgotten about. Removing pyxb from there is also enough to fix the issue. Sorry for the noise.

[lock]

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