Missing requirement on packaging

[duncanmmacleod]

Solution to issue cannot be found in the documentation.

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Issue

grayskull is missing a requirement on packaging, so installing it in isolation causes failures:

$ mamba create -n grayskull grayskull
$ mamba activate grayskull
$ grayskull --help
Traceback (most recent call last):
  File "/home/duncan/opt/mambaforge/envs/grayskull/bin/grayskull", line 6, in <module>
    from grayskull.__main__ import main
  File "/home/duncan/opt/mambaforge/envs/grayskull/lib/python3.11/site-packages/grayskull/__main__.py", line 13, in <module>
    from grayskull.base.factory import GrayskullFactory
  File "/home/duncan/opt/mambaforge/envs/grayskull/lib/python3.11/site-packages/grayskull/base/factory.py", line 8, in <module>
    from grayskull.strategy.pypi import PypiStrategy
  File "/home/duncan/opt/mambaforge/envs/grayskull/lib/python3.11/site-packages/grayskull/strategy/pypi.py", line 20, in <module>
    from grayskull.strategy.py_base import (
  File "/home/duncan/opt/mambaforge/envs/grayskull/lib/python3.11/site-packages/grayskull/strategy/py_base.py", line 18, in <module>
    from packaging.specifiers import SpecifierSet
ModuleNotFoundError: No module named 'packaging'

Installed packages

# packages in environment at /home/duncan/opt/mambaforge/envs/grayskull:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                 conda_forge    conda-forge
_openmp_mutex             4.5                       2_gnu    conda-forge
brotlipy                  0.7.0           py311hd4cff14_1005    conda-forge
bzip2                     1.0.8                h7f98852_4    conda-forge
c-ares                    1.18.1               h7f98852_0    conda-forge
ca-certificates           2022.9.24            ha878542_0    conda-forge
certifi                   2022.9.24          pyhd8ed1ab_0    conda-forge
cffi                      1.15.1          py311h409f033_2    conda-forge
charset-normalizer        2.1.1              pyhd8ed1ab_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
conda-souschef            2.2.3              pyhd8ed1ab_0    conda-forge
cryptography              38.0.3          py311h42a1071_0    conda-forge
curl                      7.86.0               h2283fc2_1    conda-forge
expat                     2.5.0                h27087fc_0    conda-forge
gettext                   0.21.1               h27087fc_0    conda-forge
git                       2.38.1          pl5321h8df7355_1    conda-forge
grayskull                 1.8.4              pyhd8ed1ab_0    conda-forge
idna                      3.4                pyhd8ed1ab_0    conda-forge
keyutils                  1.6.1                h166bdaf_0    conda-forge
krb5                      1.19.3               h08a2579_0    conda-forge
ld_impl_linux-64          2.39                 hc81fddc_0    conda-forge
libblas                   3.9.0           16_linux64_openblas    conda-forge
libcblas                  3.9.0           16_linux64_openblas    conda-forge
libcurl                   7.86.0               h2283fc2_1    conda-forge
libedit                   3.1.20191231         he28a2e2_2    conda-forge
libev                     4.33                 h516909a_1    conda-forge
libffi                    3.4.2                h7f98852_5    conda-forge
libgcc-ng                 12.2.0              h65d4601_19    conda-forge
libgfortran-ng            12.2.0              h69a702a_19    conda-forge
libgfortran5              12.2.0              h337968e_19    conda-forge
libgomp                   12.2.0              h65d4601_19    conda-forge
libiconv                  1.17                 h166bdaf_0    conda-forge
liblapack                 3.9.0           16_linux64_openblas    conda-forge
libnghttp2                1.47.0               hff17c54_1    conda-forge
libnsl                    2.0.0                h7f98852_0    conda-forge
libopenblas               0.3.21          pthreads_h78a6416_3    conda-forge
libsqlite                 3.39.4               h753d276_0    conda-forge
libssh2                   1.10.0               hf14f497_3    conda-forge
libstdcxx-ng              12.2.0              h46fd767_19    conda-forge
libuuid                   2.32.1            h7f98852_1000    conda-forge
libzlib                   1.2.13               h166bdaf_4    conda-forge
ncurses                   6.3                  h27087fc_1    conda-forge
numpy                     1.23.4          py311h7d28db0_1    conda-forge
openssl                   3.0.7                h166bdaf_0    conda-forge
pcre2                     10.40                hc3806b6_0    conda-forge
perl                      5.32.1          2_h7f98852_perl5    conda-forge
pip                       22.3.1             pyhd8ed1ab_0    conda-forge
pkginfo                   1.8.3              pyhd8ed1ab_0    conda-forge
progressbar2              4.2.0              pyhd8ed1ab_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pyopenssl                 22.1.0             pyhd8ed1ab_0    conda-forge
pysocks                   1.7.1              pyha2e5f31_6    conda-forge
python                    3.11.0          ha86cf86_0_cpython    conda-forge
python-utils              3.4.5              pyhd8ed1ab_0    conda-forge
python_abi                3.11                    2_cp311    conda-forge
rapidfuzz                 2.13.2          py311ha362b79_0    conda-forge
readline                  8.1.2                h0f457ee_0    conda-forge
requests                  2.28.1             pyhd8ed1ab_1    conda-forge
ruamel.yaml               0.17.21         py311hd4cff14_2    conda-forge
ruamel.yaml.clib          0.2.7           py311hd4cff14_0    conda-forge
ruamel.yaml.jinja2        0.2.4                      py_1    conda-forge
setuptools                65.5.1             pyhd8ed1ab_0    conda-forge
stdlib-list               0.8.0              pyhd8ed1ab_0    conda-forge
tk                        8.6.12               h27826a3_0    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
tomli-w                   1.0.0              pyhd8ed1ab_0    conda-forge
tzdata                    2022f                h191b570_0    conda-forge
urllib3                   1.26.11            pyhd8ed1ab_0    conda-forge
wheel                     0.38.2             pyhd8ed1ab_0    conda-forge
xz                        5.2.6                h166bdaf_0    conda-forge

Environment info

active environment : grayskull
    active env location : /home/duncan/opt/mambaforge/envs/grayskull
            shell level : 5
       user config file : /home/duncan/.condarc
 populated config files : /home/duncan/opt/mambaforge/.condarc
                          /home/duncan/.condarc
          conda version : 22.9.0
    conda-build version : 3.21.9
         python version : 3.9.10.final.0
       virtual packages : __linux=5.10.102.1=0
                          __glibc=2.28=0
                          __unix=0=0
                          __archspec=1=x86_64
       base environment : /home/duncan/opt/mambaforge  (writable)
      conda av data dir : /home/duncan/opt/mambaforge/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://conda.anaconda.org/igwn/linux-64
                          https://conda.anaconda.org/igwn/noarch
          package cache : /home/duncan/opt/mambaforge/pkgs
                          /home/duncan/.conda/pkgs
       envs directories : /home/duncan/opt/mambaforge/envs
                          /home/duncan/.conda/envs
               platform : linux-64
             user-agent : conda/22.9.0 requests/2.27.1 CPython/3.9.10 Linux/5.10.102.1-microsoft-standard-WSL2 debian/10 glibc/2.28
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False