Unsatisfiable error misleading with --strict-priority

[alanhdu]

Current Behavior

Under both conda 4.7.12 on Ubuntu 18.04 with Python 3.7.3, and conda 4.8.0rc0 from conda-canary, trying to install dependency that doesn't exist in conda-forge but does exist on defaults fails with a very confusing error.

Steps to Reproduce

Run:

$ docker run -it continuumio/miniconda3:4.7.12 /bin/bash
(base) root@98b5049e0fa9:/# conda config --set channel_priority strict
(base) root@98b5049e0fa9:/# conda config --add channels conda-forge
# conda create -n test --yes python-jose=3.0.1
Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: / 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
failed                                                                                                                                                                       

UnsatisfiableError: The following specifications were found to be incompatible with each other:



Package openssl conflicts for:
python -> openssl[version='1.0.*|>=1.0.2o,<1.0.3a|>=1.0.2p,<1.0.3a|>=1.1.1a,<1.1.2a']
Package zlib conflicts for:
python -> zlib[version='1.2.*|1.2.11.*|1.2.11|1.2.8|>=1.2.11,<1.3.0a0']
Package sqlite conflicts for:
python -> sqlite[version='3.13.*|3.20.*|3.9.*|>=3.24.0,<4.0a0|>=3.25.1,<4.0a0|>=3.25.2,<4.0a0|>=3.25.3,<4.0a0|>=3.26.0,<4.0a0|>=3.28.0,<4.0a0|>=3.30.1,<4.0a0']
Package libstdcxx-ng conflicts for:
python -> libstdcxx-ng[version='>=4.9|>=7.3.0']
Package libgcc-ng conflicts for:
pycryptodome[version='>=3.3.1,<4.0.0'] -> libgcc-ng[version='>=4.9|>=7.3.0']
python -> libgcc-ng[version='>=4.9|>=7.3.0']
Package bzip2 conflicts for:
python -> bzip2[version='>=1.0.6,<2.0a0']
Package xz conflicts for:
python -> xz[version='5.0.*|5.2.*|>=5.2.3,<5.3.0a0|>=5.2.4,<5.3.0a0']
Package tk conflicts for:
python -> tk[version='8.5.*|8.6.*|>=8.6.7,<8.7.0a0|>=8.6.8,<8.7.0a0|>=8.6.9,<8.7.0a0']
Package gmp conflicts for:
pycryptodome[version='>=3.3.1,<4.0.0'] -> gmp[version='>=6.1.2,<7.0a0']
Package readline conflicts for:
python -> readline[version='6.2.*|7.0.*|7.0|>=7.0,<8.0a0|>=8.0,<9.0a0']
Package pip conflicts for:
python -> pip
Package ncurses conflicts for:
python -> ncurses[version='5.9|5.9.*|>=6.1,<6.2.0a0']
Package libffi conflicts for:
python -> libffi[version='>=3.2.1,<3.3.0a0']
Note that strict channel priority may have removed packages required for satisfiability.

Environment Information

`conda info`

     active environment : base
    active env location : /opt/anaconda
            shell level : 2
       user config file : /home/alan/.condarc
 populated config files : /home/alan/.condarc
          conda version : 4.7.12
    conda-build version : not installed
         python version : 3.7.3.final.0
       virtual packages : 
       base environment : /opt/anaconda  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /opt/anaconda/pkgs
                          /home/alan/.conda/pkgs
       envs directories : /opt/anaconda/envs
                          /home/alan/.conda/envs
               platform : linux-64
             user-agent : conda/4.7.12 requests/2.22.0 CPython/3.7.3 Linux/5.0.0-23-generic ubuntu/18.04.3 glibc/2.27
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

`conda config --show-sources`

==> /home/alan/.condarc <==
channel_priority: strict
channels:
  - conda-forge
  - defaults

`conda list --show-channel-urls`

# packages in environment at /opt/anaconda:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                        main    defaults
asn1crypto                1.2.0                    py37_0    conda-forge
astor                     0.8.0                    pypi_0    pypi
bzip2                     1.0.8                h516909a_1    conda-forge
ca-certificates           2019.9.11            hecc5488_0    conda-forge
certifi                   2019.9.11                py37_0    conda-forge
cffi                      1.13.2           py37h8022711_0    conda-forge
chardet                   3.0.4                 py37_1003    conda-forge
click                     7.0                      pypi_0    pypi
conda                     4.7.12                   py37_0    conda-forge
conda-package-handling    1.6.0            py37h516909a_0    conda-forge
cryptography              2.7              py37h72c5cf5_0    conda-forge
idna                      2.8                   py37_1000    conda-forge
libffi                    3.2.1             he1b5a44_1006    conda-forge
libgcc-ng                 9.1.0                hdf63c60_0    defaults
libstdcxx-ng              9.1.0                hdf63c60_0    defaults
ncurses                   6.1               hf484d3e_1002    conda-forge
openssl                   1.1.1c               h516909a_0    conda-forge
pip                       19.3.1                   py37_0    conda-forge
pur                       5.2.2                    pypi_0    pypi
pycosat                   0.6.3           py37h516909a_1002    conda-forge
pycparser                 2.19                     py37_1    conda-forge
pyopenssl                 19.0.0                   py37_0    conda-forge
pysocks                   1.7.1                    py37_0    conda-forge
python                    3.7.3                h33d41f4_1    conda-forge
readline                  8.0                  hf8c457e_0    conda-forge
requests                  2.22.0                   py37_1    conda-forge
ruamel_yaml               0.15.71         py37h14c3975_1000    conda-forge
setuptools                41.6.0                   py37_1    conda-forge
six                       1.12.0                py37_1001    conda-forge
sqlite                    3.30.1               hcee41ef_0    conda-forge
tk                        8.6.9             hed695b0_1003    conda-forge
tqdm                      4.36.1                     py_0    conda-forge
urllib3                   1.25.6                   py37_0    conda-forge
wheel                     0.33.6                   py37_0    conda-forge
xz                        5.2.4             h14c3975_1001    conda-forge
yaml                      0.1.7             h14c3975_1001    conda-forge
zlib                      1.2.11            h516909a_1006    conda-forge

[soapy1]

Good observation, thanks for this report. This issue is related to #9363

[183amir]

I am facing this issue as well but I don't understand what is wrong here. What part of the error is misleading? What would be a better error?

I am trying to create an environment:

$ conda create -n temp --override-channels \
--channel=http://www.idiap.ch/software/bob/conda \
--channel=defaults \
--strict-channel-priority \
"python" "setuptools" "black" "click" "click-plugins" \
"conda" "conda-build" "conda-verify" "certifi" "docformatter" \
"pytz" "python-dateutil" "gitpython" "python-gitlab" \
"requests" "sphinx" "pyyaml" "twine" "lxml" "jinja2" \
"termcolor" "psutil" "tabulate" "python-graphviz" "sphinx_rtd_theme"

and I have done a conda search on all packages that get installed when I create the environment without --strict-channel-priority.

conda search ... alabaster appdirs asn1crypto beautifulsoup4 black bleach \
cffi chardet click cmarkgfm conda conda-build conda-package-handling \
cryptography docformatter docutils future icu idna libarchive libedit libffi \
libgcc-ng liblief libstdcxx-ng libxml2 libxslt lxml lz4-c lzo markupsafe ncurses \
openssl pkginfo psutil py-lief pycosat pycparser pyopenssl pysocks python-gitlab \
python-libarchive-c pyyaml readline readme_renderer requests ruamel_yaml \
setuptools smmap2 soupsieve tabulate termcolor tk toml untokenize urllib3 \
webencodings xz yaml zlib zstd ...

No package exists in both channels.
So, why adding --strict-channel-priority breaks this?

[183amir]

I found it! Both channels had tqdm and that's what was conflicting!

tqdm                          4.11.1          py27_0  software/bob/conda  
tqdm                          4.11.1          py35_0  software/bob/conda  
tqdm                          4.11.1          py36_0  software/bob/conda  
....
tqdm                          4.39.0            py_0  pkgs/main           
tqdm                          4.40.0            py_0  pkgs/main           
tqdm                          4.40.2            py_0  pkgs/main           

[github-actions]

Hi there, thank you for your contribution!

This issue has been automatically marked as stale because it has not had recent activity. It will be closed automatically if no further activity occurs.

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Thanks!