Github actions workflow option for a project using reticulate and python dependencies

[griff-rees]

Hi. I've locally (and via a few colleagues' computers, I think all macOS thus far) tested a package that requires reticulate and 2 python libraries and I was hoping to get those tests included on github in preparation to submit to CRAN. I'm getting different errors for different operating systems, but if there could be a general yaml for github workflows using reticulate that would be great. I also tried travis-ci but the examples for that seemed worse.

https://github.com/griff-rees/py2Rgraphs/actions/runs/693339267

A general summary of the issues: on linux there's no local python install, for macOS there's a permission error, and on Windows there's no installed python (and it seems to target python 2.7 rather than the minimum 3.6 as I specify in the DESCRIPTION). Any advice appreciated. Also: there are warnings on my attempt to use a 3 clause BSD licence but I think that's separate.

Linux error

Error: Error: package or namespace load failed for ‘py2Rgraphs’:
 .onLoad failed in loadNamespace() for 'py2Rgraphs', details:
  call: NULL
  error: could not find a Python environment for /usr/bin/python3

macOS error

NotWritableError: The current user does not have write permissions to a required path.
  path: /usr/local/miniconda/pkgs/cache/b89cf7bf.json
  uid: 501
  gid: 20

Windows error (seems to default to python 2.7 while this package requires python >=3.7)

Error: Error: package or namespace load failed for 'py2Rgraphs':
 .onLoad failed in loadNamespace() for 'py2Rgraphs', details:
  call: NULL
  error: could not find a Python environment for C:/hostedtoolcache/windows/Python/2.7.18/x86/python.exe

Thanks very much!

[griff-rees]

Have just found this, will try some of these modifications: https://github.com/rstudio/reticulate/blob/master/.github/workflows/R-CMD-check.yaml

[griff-rees]

I've added one of the main differences between the reticulate yaml and mine for linux testing but that hasn't fixed the problem.

The error message may imply that conda is a solution but I don't know if that could help windows and macOS builds.

Preparing transaction: ...working... done
Verifying transaction: ...working... done
Executing transaction: ...working... done
#
# To activate this environment, use
#
#     $ conda activate r-reticulate
#
# To deactivate an active environment, use
#
#     $ conda deactivate

Error: Error: package or namespace load failed for ‘py2Rgraphs’:
 .onLoad failed in loadNamespace() for 'py2Rgraphs', details:
  call: NULL
  error: could not find a Python environment for /usr/bin/python3
Error: Error: loading failed
Execution halted
ERROR: loading failed
* removing ‘/home/runner/work/py2Rgraphs/py2Rgraphs/check/py2Rgraphs.Rcheck/py2Rgraphs’

1 error ✖ | 0 warnings ✔ | 1 note ✖