Python 3.7 does not appear to be supported anymore

[sam-hoffman]

Hi! My env file looks like this:

name: my-env
channels:
  - conda-forge
  - defaults
dependencies:
  - python<3.8
  - networkit==6.1.0
...

However, the setup-miniconda logs report that Python 3.8.5 is being added to the env file, which then predictably fails

2021-03-29T16:03:37.0343949Z Making patched copy of 'environment-file: my-service/env.yml'
2021-03-29T16:03:37.0344996Z name: my-env
2021-03-29T16:03:37.0345729Z channels:
2021-03-29T16:03:37.0346613Z   - defaults
2021-03-29T16:03:37.0347511Z   - conda-forge
2021-03-29T16:03:37.0348311Z dependencies:
2021-03-29T16:03:37.0349231Z   - python<3.8
2021-03-29T16:03:37.0350128Z   - networkit==6.1.0
...
2021-03-29T16:03:37.0370060Z   - python=3.8.5
2021-03-29T16:03:37.0370462Z 
2021-03-29T16:03:37.0371612Z ##[group]Updating 'my-env' env from conda env update...
2021-03-29T16:03:37.0373261Z [command]/usr/share/miniconda/condabin/conda env update --name my-env --file /tmp/environment-patched.yml
2021-03-29T16:04:09.3426732Z Collecting package metadata (repodata.json): ...working... done
2021-03-29T16:04:09.3822645Z Solving environment: ...working... failed
2021-03-29T16:04:09.3833700Z ##[warning]
ResolvePackageNotFound: 
  - python[version='3.8.5.*,<3.8']

Is this related to the new update? It has not failed in the past. I tried pinning [email protected] but had the same error result. Ideally, I'd like to be able to specify the Python version in my env.yml file.

[jaimergp]

Can you try leaving your env file unrestrained when it comes to python and specify python-version: 3.7?

name: my-env
channels:
  - conda-forge
  - defaults
dependencies:
  - python
  - networkit==6.1.0
  ....

[sam-hoffman]

Unfortunately for some of our codebases we need to specify the Python version in the env.yml file.

Would you accept a PR to allow the Python version specified in the env.yml file to override the Python version defaulted to in the github action?

[jaimergp]

I see. I guess that'd be ok but before you put any work I'll have @bollwyvl and @goanpeca confirm!

[bollwyvl]

what does your action invocation look like?

[bollwyvl]

Lacking more precise information...

v2.1 tries to reduce the number of successive re-solves of the environment, for performance reasons.

If you specify use: python-version:, it will always override whatever it finds in environment.yml, as it now actually creates a patched version of the file and conda env updates that in one shot.

Note that #160 (which did provide enough information to debug the issue) points out that we're messing up the channel ordering, because javascript, but we'll get that sorted this evening.

In the near term (e.g. next 24 hours), try removing python-version, and provided you are not bit by the channel ordering bug, you should see the expected behavior.

[sam-hoffman]

Thank you @bollwyvl ! You are correct, removing python-version from the actions specification fixed the problem. This issue can be closed :) Thank you so much for all your hard work, all of you