Build GRASS GIS in a conda environment on macOS

[mdpiper]

This PR is an attempt to build GRASS GIS in an isolated conda environment, using only packages from conda-forge, not the OS.

This addresses #14.

[mdpiper]

I'm working through the dependencies in the configure script. I'm currently stuck on PDAL.

[mdpiper]

@chaedri @SamKodama This is just to let you know that I'm working on this.

[mdpiper]

I've got this working on macOS, but not on Linux (failing on make on CentOS and Ubuntu).

[mdpiper]

@SamKodama I think I've got this working on macOS. If you have a chance to try it, let me know if it works for you.

[SamKodama]

@mdpiper I was successfully able to create the environment with the .yml file. I don't have mamba so I used conda. I was not able to install grass and received the following output/error
Kodama_CondaEnvAttempt_2.txt

Should I install mamba and try again using mamba instead of conda?

[mdpiper]

@SamKodama Line 167 of your output is suspect because we shouldn't be looking for proj in /usr/share/proj. You'll need to check out the branch this pull request is based on to run the latest version of the install-grass.sh script. But actually, don't worry about this--I'll set up continuous integration to check this. I'll get back to you soon-ish.

[SamKodama]

Okay, sounds good. Thank you!

[chaedri]

Awesome! I haven't tested but it looks good. I found another repo in our lab that installs GRASS inside a conda environment (for our institutional HPC): https://github.com/ncsu-geoforall-lab/grass-gis-on-hpc-henry2/

@cmbarton might also be helpful here - I think he builds the Mac binaries for GRASS with a conda environment.

[mdpiper]

@chaedri The GRASS conda package is from @mcflugen. :) It's out of date, though, and I don't have time now to update it.

[mcflugen]

@mdpiper, @chaedri

The GRASS conda package is from @mcflugen.

Yes, that is out of date, the latest version is at https://github.com/nilason/grass-conda

[mdpiper]

I'm going to merge this PR, recognizing that it's a step to a solution--I haven't got it working on Linux, and haven't tried on Windows.

[cmbarton]

I'm planning on trying to test this over the summer, once I get back to the US. As part of a new NSF grant for GRASS, the GRASS team would like to try to get GRASS as a Conda package for all platforms. So any help in doing this would be greatly appreciated. There is also parallel work going on to make GRASS compatible with Jupyter notebooks.