meson-python: pip check fails due to dependency on ninja

Running pip check inside a conda environment currently fails because meson-python depends on the PyPI version of ninja and cannot detect the actually installed ninja version from conda-forge.

❯ mamba list
# packages in environment at /home/awvwgk/software/opt/conda/envs/mesonpep517:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       2_gnu    conda-forge
attrs                     21.4.0             pyhd8ed1ab_0    conda-forge
auditwheel                5.1.2            py39hf3d152e_0    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
ca-certificates           2022.5.18.1          ha878542_0    conda-forge
cffi                      1.15.0           py39h4bc2ebd_0    conda-forge
dftd3                     0.5.1                    pypi_0    pypi
importlib-metadata        4.11.3           py39hf3d152e_1    conda-forge
iniconfig                 1.1.1              pyh9f0ad1d_0    conda-forge
ld_impl_linux-64          2.36.1               hea4e1c9_2    conda-forge
libblas                   3.9.0           14_linux64_openblas    conda-forge
libcblas                  3.9.0           14_linux64_openblas    conda-forge
libffi                    3.4.2                h7f98852_5    conda-forge
libgcc-ng                 11.2.0              h1d223b6_16    conda-forge
libgfortran-ng            11.2.0              h69a702a_16    conda-forge
libgfortran5              11.2.0              h5c6108e_16    conda-forge
libgomp                   11.2.0              h1d223b6_16    conda-forge
liblapack                 3.9.0           14_linux64_openblas    conda-forge
libnsl                    2.0.0                h7f98852_0    conda-forge
libopenblas               0.3.20          pthreads_h78a6416_0    conda-forge
libstdcxx-ng              11.2.0              he4da1e4_16    conda-forge
libuuid                   2.32.1            h7f98852_1000    conda-forge
libzlib                   1.2.11            h166bdaf_1014    conda-forge
meson                     0.62.0             pyhd8ed1ab_0    conda-forge
meson-python              0.3.0                    pypi_0    pypi
mesonpep517               0.2                pyhd8ed1ab_0    conda-forge
minpack                   2.0.0                    pypi_0    pypi
ncurses                   6.3                  h27087fc_1    conda-forge
ninja                     1.10.2               h4bd325d_1    conda-forge
numpy                     1.22.3           py39h18676bf_2    conda-forge
openssl                   3.0.3                h166bdaf_0    conda-forge
packaging                 21.3               pyhd8ed1ab_0    conda-forge
pep517                    0.12.0           py39hf3d152e_2    conda-forge
pint                      0.19.1             pyhd8ed1ab_0    conda-forge
pip                       22.0.4             pyhd8ed1ab_0    conda-forge
pluggy                    1.0.0            py39hf3d152e_3    conda-forge
py                        1.11.0             pyh6c4a22f_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pydantic                  1.9.0            py39hb9d737c_1    conda-forge
pyelftools                0.28             py39hf3d152e_2    conda-forge
pyparsing                 3.0.8              pyhd8ed1ab_0    conda-forge
pytest                    7.1.2            py39hf3d152e_0    conda-forge
python                    3.9.12          h2660328_1_cpython    conda-forge
python-build              0.7.0              pyhd8ed1ab_0    conda-forge
python_abi                3.9                      2_cp39    conda-forge
qcelemental               0.24.0             pyhd8ed1ab_0    conda-forge
readline                  8.1                  h46c0cb4_0    conda-forge
setuptools                62.1.0           py39hf3d152e_0    conda-forge
sqlite                    3.38.2               h4ff8645_0    conda-forge
tk                        8.6.12               h27826a3_0    conda-forge
toml                      0.10.2             pyhd8ed1ab_0    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
typing-extensions         4.2.0                hd8ed1ab_1    conda-forge
typing_extensions         4.2.0              pyha770c72_1    conda-forge
tzdata                    2022a                h191b570_0    conda-forge
wheel                     0.37.1             pyhd8ed1ab_0    conda-forge
xz                        5.2.5                h516909a_1    conda-forge
zipp                      3.8.0              pyhd8ed1ab_0    conda-forge
zlib                      1.2.11            h166bdaf_1014    conda-forge
❯ pip check
meson-python 0.3.0 requires ninja, which is not installed.

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 25 (18 by maintainers)

Most upvoted comments

If I can see this correctly the meson package on PyPI does not depend on Kitware’s ninja distribution, therefore I’m wondering why meson-python is adding it as dependency.

Meson does have an optional extra, pip install 'meson[ninja]' will also guarantee that ninja support is resolved via PyPI rather than being assumed to exist via the OS repositories. And it is frequently used by linux distros which do not install PyPI-repackaged versions of system C++ command-line tools, so it cannot be a hard dependency.

meson-python is obviously making the tradeoff that pip install foo where foo is a package that utilizes this build backend, cannot work reliably if it cannot install ninja, and it cannot do that via pacman, emerge, dnf, apt, xbps… so better to install an extra copy than to break pip install. Obviously, this will mean distribution via channels that install ninja outside of pip, will need to patch meson-python to not depend on ninja.

eli-schwartz on May 22, 2022