python2.7-pluggy not buildable

[applike-ss]

Describe the bug
I am getting this error when pluggy is built as one of the dependencies in my docker build:

File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/src/setuptools_scm/utils.py", line 41
    print(*k)
          ^
SyntaxError: invalid syntax
builder for '/nix/store/6b1ybjsxs32339zjnzyy94g6i0w66hi0-python2.7-pluggy-0.8.0.drv' failed with exit code 1

To Reproduce
Steps to reproduce the behavior:

1. git clone https://github.com/ss89/docker-rhodecode-ce
2. cd docker-rhodecode-ce
3. docker build .
4. wait...

Expected behavior
There shouldn't be a build error for python2.7-pluggy.

Additional context
partial output from docker:

building '/nix/store/6b1ybjsxs32339zjnzyy94g6i0w66hi0-python2.7-pluggy-0.8.0.drv'...
unpacking sources
unpacking source archive /nix/store/g3118ms8fl3pv4ps2bprc37ik7g4ni1n-pluggy-0.8.0.tar.gz
source root is pluggy-0.8.0
setting SOURCE_DATE_EPOCH to timestamp 1539688357 of file pluggy-0.8.0/setup.cfg
patching sources
configuring
building
/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/src
<pkg_resources.WorkingSet object at 0x7f4ab1b5ead0>
Traceback (most recent call last):
  File "nix_run_setup", line 8, in <module>
    exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
  File "setup.py", line 46, in <module>
    main()
  File "setup.py", line 41, in main
    packages=["pluggy"],
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/__init__.py", line 128, in setup
    _install_setup_requires(attrs)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/__init__.py", line 123, in _install_setup_requires
    dist.fetch_build_eggs(dist.setup_requires)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/dist.py", line 461, in fetch_build_eggs
    replace_conflicting=True,
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pkg_resources/__init__.py", line 866, in resolve
    replace_conflicting=replace_conflicting
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1146, in best_match
    return self.obtain(req, installer)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1158, in obtain
    return installer(requirement)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/dist.py", line 528, in fetch_build_egg
    return cmd.easy_install(req)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 673, in easy_install
    return self.install_item(spec, dist.location, tmpdir, deps)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 699, in install_item
    dists = self.install_eggs(spec, download, tmpdir)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 882, in install_eggs
    return self.build_and_install(setup_script, setup_base)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1150, in build_and_install
    self.run_setup(setup_script, setup_base, args)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1136, in run_setup
    run_setup(setup_script, args)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 253, in run_setup
    raise
  File "/nix/store/fb993ma5m3y1hs95gay44j8mjjq5qlkl-python-2.7.15/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
    yield
  File "/nix/store/fb993ma5m3y1hs95gay44j8mjjq5qlkl-python-2.7.15/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 166, in save_modules
    saved_exc.resume()
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 141, in resume
    six.reraise(type, exc, self._tb)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 154, in save_modules
    yield saved
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
    yield
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 250, in run_setup
    _execfile(setup_script, ns)
  File "/nix/store/dldi0k4v13439l1s1h52agc2i7bwcrxw-python2.7-bootstrapped-pip-9.0.1/lib/python2.7/site-packages/setuptools/sandbox.py", line 45, in _execfile
    exec(code, globals, locals)
  File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/setup.py", line 52, in <module>
    
  File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/setup.py", line 29, in scm_config
    description="plugin and hook calling mechanisms for python",
  File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/src/setuptools_scm/__init__.py", line 8, in <module>
  File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/src/setuptools_scm/config.py", line 6, in <module>
  File "/tmp/nix-build-python2.7-pluggy-0.8.0.drv-0/easy_install-wpQldL/setuptools_scm-6.0.1/src/setuptools_scm/utils.py", line 41
    print(*k)
          ^
SyntaxError: invalid syntax
builder for '/nix/store/6b1ybjsxs32339zjnzyy94g6i0w66hi0-python2.7-pluggy-0.8.0.drv' failed with exit code 1
building '/nix/store/bawcrj33kj5vhfds3palsg9vd0pq9vhg-python2.7-py-1.6.0.drv'...
cannot build derivation '/nix/store/ib5jh2ahlrjmbcm9s2wr7gr2rr0f1k6n-python2.7-pytest-3.8.2.drv': 1 dependencies couldn't be built
error: build of '/nix/store/4zfk72m3k7vy5fmaj0sv4mlf51zi5lcr-python2.7-elasticsearch-6.3.1.drv', '/nix/store/8ql2278xlj27j1p5m27v9vzgc7128k6r-python2.7-six-1.11.0.drv', '/nix/store/9s489gjcmzmsasnqk85m6p0375vjihq1-python2.7-elasticsearch-dsl-6.3.1.drv', '/nix/store/bawcrj33kj5vhfds3palsg9vd0pq9vhg-python2.7-py-1.6.0.drv', '/nix/store/d2apwj5bnfhyjxblg4qcg5a6c8yp43id-python2.7-pytest-cov-2.6.0.drv', '/nix/store/dd3l5w6y8h5znsc40y2ln72qk5qqbscr-python2.7-pytest-sugar-0.9.1.drv', '/nix/store/f5idw61xkr5psl253rmrqsrrh7iscs5k-python2.7-responses-0.5.1.drv', '/nix/store/gbyzw4znl7zg6zwcpjn90h4l8xqq8wqr-python2.7-elasticsearch1-dsl-0.0.12.drv', '/nix/store/ib5jh2ahlrjmbcm9s2wr7gr2rr0f1k6n-python2.7-pytest-3.8.2.drv', '/nix/store/ikg4l5iraif1r3icy9sb8z8rzv4k99ww-python2.7-pytest-runner-4.2.drv', '/nix/store/izabjdcbzz3jcy2cl0n92yng50vg5lsi-python2.7-urllib3-1.24.1.drv', '/nix/store/mz7jyjhhrzjnxxpnq1x288r9zpxzpsd0-python2.7-elasticsearch2-2.5.0.drv', '/nix/store/nmiiyiac38v8sxcc382qjs49djnpvvph-python2.7-requests-2.9.1.drv', '/nix/store/ynjsjcz26qckymg1w4f2xbczyga27fnl-python2.7-whoosh-2.7.4.drv' failed
The command '/bin/sh -c USER=root . /root/.nix-profile/etc/profile.d/nix.sh &&         cd rhodecode-develop/rhodecode-tools-ce &&         nix-shell' returned a non-zero code: 100

[rmcgibbo]

Because
(a) python2 is EOL,
(b) most upstream packages have already or are now dropping compatibility with python2, and
(c) nixpkgs rarely keeps multiple versions of a single package in the package,

I think this is going to be an expected and increasingly common occurrence.

It's probably better to either pin your nixpkgs to an old revision or upgrade your stack to python3.

[FRidh]

an older version of pluggy can be added, if someone is up for doing this

[Gabriella439]

This can still be fixed by adding setuptools_scm to nativeBuildInputs for any derivations that fail in this way

What's happening is that setuptools doesn't find the setuptools_scm plugin when running the Nix build, so it attempts to impurely install the latest download of the plugin which is not Python-2-compatible. Adding setuptools_scm to nativeBuildInputs provides a Python 2 compatible version

[stale]

I marked this as stale due to inactivity. → More info

[FliegendeWurst]

Build works on 21.11 and most likely current master.