seeking a simple way to update an environment or create it if it's missing

[atom-andrew]

Troubleshooting docs

• My problem is not solved in the Troubleshooting docs

Anaconda default channels

• I do NOT use the Anaconda default channels (pkgs/* etc.)

How did you install Mamba?

Mambaforge or latest Miniforge

Search tried in issue tracker

yes

Latest version of Mamba

• My problem is not solved with the latest version

Tried in Conda?

I have this problem with Conda as well, without using Mamba

Describe your issue

We have been using the simple command:

mamba env create || mamba env update

to ensure that an environment (a) exist and (b) is up-to-date. This no longer appears to work with mamba 2.0, and I can't find a simple substitute for it. If I use mamba create -n <env name>, I'll get an interactive prompt if the environment already exists. If I add -y, then it will empty out the environment. Also, mamba env update now seems to require explicitly passing an -f environment.yml file argument.

The best I could come up with is:

yes "n" | mamba -n myenv || mamba update -y -f environment.yml

This is definitely more complicated and it requires another non-mamba command. I'd welcome a better suggestion on how to write this, but I also suspect that adding a -n option to mamba (or some way to fail quickly) would be a good thing. Also of note is that mamba env create also now requires a -f environment.yml and will again clobber the entire environment if we pass it the -y argument (whereas I'd like this command to just update missing dependencies). Thanks for your help.

mamba info / micromamba info

No response

Logs

No response

environment.yml

No response

~/.condarc

No response