conda_build_config.yaml configuration error

[brey]

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What happened?

When using a conda_build_config.yaml file to define mpi variants like

mpi:
  - mpich
  - openmpi
  

I get the following error

Traceback (most recent call last):
  File "/Users/brey/miniconda3/bin/conda-build", line 11, in <module>
    sys.exit(main())
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/cli/main_build.py", line 593, in main
    execute(sys.argv[1:])
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/cli/main_build.py", line 573, in execute
    outputs = api.build(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/api.py", line 253, in build
    return build_tree(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/build.py", line 3772, in build_tree
    metadata_tuples = render_recipe(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/render.py", line 1005, in render_recipe
    rendered_metadata = distribute_variants(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/render.py", line 892, in distribute_variants
    mv.parse_until_resolved(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1267, in parse_until_resolved
    self.parse_again(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1191, in parse_again
    self._get_contents(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1869, in _get_contents
    env.globals.update(environ.get_dict(m=self, skip_build_id=skip_build_id))
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/environ.py", line 317, in get_dict
    d.update(python_vars(m, prefix, escape_backslash))
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/environ.py", line 388, in python_vars
    build_or_host = "host" if metadata.is_cross else "build"
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1105, in is_cross
    return bool(self.get_depends_top_and_out("host")) or "host" in self.meta.get(
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1467, in get_depends_top_and_out
    extra_reqs = [
  File "/Users/brey/miniconda3/lib/python3.9/site-packages/conda_build/metadata.py", line 1468, in <listcomp>
    dep for dep in extra_reqs if dep.split()[0] not in req_names
AttributeError: 'NoneType' object has no attribute 'split'

Conda Info

❯ conda info

     active environment : base
    active env location : /Users/brey/mambaforge
            shell level : 1
       user config file : /Users/brey/.condarc
 populated config files : /Users/brey/mambaforge/.condarc
                          /Users/brey/.condarc
          conda version : 23.1.0
    conda-build version : 3.25.0
         python version : 3.10.12.final.0
       virtual packages : __archspec=1=x86_64
                          __osx=12.6.8=0
                          __unix=0=0
       base environment : /Users/brey/mambaforge  (writable)
      conda av data dir : /Users/brey/mambaforge/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/brey/mambaforge/pkgs
                          /Users/brey/.conda/pkgs
       envs directories : /Users/brey/mambaforge/envs
                          /Users/brey/.conda/envs
               platform : osx-64
             user-agent : conda/23.1.0 requests/2.31.0 CPython/3.10.12 Darwin/21.6.0 OSX/12.6.8
                UID:GID : 501:20
             netrc file : None
           offline mode : False

Conda Config

==> /Users/brey/mambaforge/.condarc <==
channels:
  - conda-forge

==> /Users/brey/.condarc <==
proxy_servers: {}
channel_priority: strict
channels:
  - conda-forge
  - defaults
anaconda_upload: False

Conda list

# packages in environment at /Users/brey/mambaforge:
#
# Name                    Version                   Build  Channel
beautifulsoup4            4.12.2             pyha770c72_0    conda-forge
brotli-python             1.0.9           py310h7a76584_9    conda-forge
bzip2                     1.0.8                h0d85af4_4    conda-forge
c-ares                    1.19.1               h0dc2134_0    conda-forge
ca-certificates           2023.5.7             h8857fd0_0    conda-forge
cctools                   973.0.1             h40f6528_13    conda-forge
cctools_osx-64            973.0.1             h5676edf_13    conda-forge
certifi                   2023.5.7           pyhd8ed1ab_0    conda-forge
cffi                      1.15.1          py310ha78151a_3    conda-forge
chardet                   5.1.0           py310h2ec42d9_0    conda-forge
charset-normalizer        3.1.0              pyhd8ed1ab_0    conda-forge
click                     8.1.4           unix_pyh707e725_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
conda                     23.1.0          py310h2ec42d9_0    conda-forge
conda-build               3.25.0          py310h2ec42d9_0    conda-forge
conda-index               0.2.3              pyhd8ed1ab_0    conda-forge
conda-package-handling    2.0.2              pyh38be061_0    conda-forge
conda-package-streaming   0.8.0              pyhd8ed1ab_0    conda-forge
conda-verify              3.1.1           py310h2ec42d9_1006    conda-forge
cryptography              41.0.1          py310ha1817de_0    conda-forge
filelock                  3.12.2             pyhd8ed1ab_0    conda-forge
fmt                       9.1.0                hb8565cd_0    conda-forge
future                    0.18.3             pyhd8ed1ab_0    conda-forge
glob2                     0.7                        py_0    conda-forge
icu                       72.1                 h7336db1_0    conda-forge
idna                      3.4                pyhd8ed1ab_0    conda-forge
jinja2                    3.1.2              pyhd8ed1ab_1    conda-forge
krb5                      1.20.1               h049b76e_0    conda-forge
ld64                      609                 ha02d983_13    conda-forge
ld64_osx-64               609                 hbfe4790_13    conda-forge
libarchive                3.6.2                h0b5dc4a_1    conda-forge
libcurl                   8.1.2                hbee3ae8_0    conda-forge
libcxx                    16.0.6               hd57cbcb_0    conda-forge
libedit                   3.1.20191231         h0678c8f_2    conda-forge
libev                     4.33                 haf1e3a3_1    conda-forge
libffi                    3.4.2                h0d85af4_5    conda-forge
libiconv                  1.17                 hac89ed1_0    conda-forge
liblief                   0.12.3               hf0c8a7f_0    conda-forge
libllvm16                 16.0.6               he4b1e75_0    conda-forge
libmamba                  1.4.2                h9d281b0_0    conda-forge
libmambapy                1.4.2           py310hb15139c_0    conda-forge
libnghttp2                1.52.0               he2ab024_0    conda-forge
libsolv                   0.7.24               h7d26f99_1    conda-forge
libsqlite                 3.42.0               h58db7d2_0    conda-forge
libssh2                   1.11.0               hd019ec5_0    conda-forge
libxml2                   2.11.4               hd95e348_0    conda-forge
libzlib                   1.2.13               h8a1eda9_5    conda-forge
lz4-c                     1.9.4                hf0c8a7f_0    conda-forge
lzo                       2.10              haf1e3a3_1000    conda-forge
mamba                     1.4.2           py310h6bde348_0    conda-forge
markupsafe                2.1.3           py310h6729b98_0    conda-forge
more-itertools            9.1.0              pyhd8ed1ab_0    conda-forge
ncurses                   6.4                  hf0c8a7f_0    conda-forge
openssl                   3.1.1                h8a1eda9_1    conda-forge
packaging                 23.1               pyhd8ed1ab_0    conda-forge
patch                     2.7.6             hbcf498f_1002    conda-forge
pip                       23.1.2             pyhd8ed1ab_0    conda-forge
pkginfo                   1.9.6              pyhd8ed1ab_0    conda-forge
pluggy                    1.2.0              pyhd8ed1ab_0    conda-forge
psutil                    5.9.5           py310h90acd4f_0    conda-forge
py-lief                   0.12.3          py310h7a76584_0    conda-forge
pybind11-abi              4                    hd8ed1ab_3    conda-forge
pycosat                   0.6.4           py310h90acd4f_1    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pyopenssl                 23.2.0             pyhd8ed1ab_1    conda-forge
pysocks                   1.7.1              pyha2e5f31_6    conda-forge
python                    3.10.12         had23ca6_0_cpython    conda-forge
python-libarchive-c       4.0             py310h2ec42d9_2    conda-forge
python_abi                3.10                    3_cp310    conda-forge
pytz                      2023.3             pyhd8ed1ab_0    conda-forge
pyyaml                    6.0             py310h90acd4f_5    conda-forge
readline                  8.2                  h9e318b2_1    conda-forge
reproc                    14.2.4               hb7f2c08_0    conda-forge
reproc-cpp                14.2.4               hf0c8a7f_0    conda-forge
requests                  2.31.0             pyhd8ed1ab_0    conda-forge
ripgrep                   13.0.0               hbbacdb1_2    conda-forge
ruamel.yaml               0.17.32         py310h6729b98_0    conda-forge
ruamel.yaml.clib          0.2.7           py310h90acd4f_1    conda-forge
setuptools                68.0.0             pyhd8ed1ab_0    conda-forge
sigtool                   0.1.3                h88f4db0_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
soupsieve                 2.3.2.post1        pyhd8ed1ab_0    conda-forge
tapi                      1100.0.11            h9ce4665_0    conda-forge
tk                        8.6.12               h5dbffcc_0    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
toolz                     0.12.0             pyhd8ed1ab_0    conda-forge
tqdm                      4.65.0             pyhd8ed1ab_1    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
urllib3                   2.0.3              pyhd8ed1ab_1    conda-forge
wheel                     0.40.0             pyhd8ed1ab_0    conda-forge
xz                        5.2.6                h775f41a_0    conda-forge
yaml                      0.2.5                h0d85af4_2    conda-forge
yaml-cpp                  0.7.0                hf0c8a7f_2    conda-forge
zstandard                 0.19.0          py310h151724a_2    conda-forge
zstd                      1.5.2                hbc0c0cd_6    conda-forge

Additional Context

I have tested in another miniconda based env with py3.9 same behaviour. This is new. I have build with the same installation many packages in the past with no problem.

[github-actions]

Hi there, thank you for your contribution!

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Thanks!