Precedence of $CONDARC and $MAMBARC

[0xbe7a]

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?

Micromamba

Search tried in issue tracker

yes

Latest version of Mamba

• My problem is not solved with the latest version

Tried in Conda?

I do not have this problem with Conda, just with Mamba

Describe your issue

When setting $CONDARC or $MAMBARC ignores all other configuration files in default locations.
conda handles them with the lowest precedence. Mamba also claims to do so: ttps://mamba.readthedocs.io/en/latest/user_guide/configuration.html#multiple-rc-files

mamba info / micromamba info

➜  mamba git:(main) ✗ micromamba info

       libmamba version : 1.5.6
     micromamba version : 1.5.6
           curl version : libcurl/8.1.2 (SecureTransport) LibreSSL/3.3.6 zlib/1.2.12 nghttp2/1.55.1
     libarchive version : libarchive 3.5.3 zlib/1.2.12 liblzma/5.0.5 bz2lib/1.0.8
       envs directories : /Users/belastoyan/micromamba/envs
          package cache : /Users/belastoyan/micromamba/pkgs
                          /Users/belastoyan/.mamba/pkgs
            environment : None (not found)
           env location : -
      user config files : /Users/belastoyan/.mambarc
 populated config files : /Users/belastoyan/.mambarc
                          /Users/belastoyan/.condarc
       virtual packages : __unix=0=0
                          __osx=14.0=0
                          __archspec=1=arm64
               channels : https://conda.anaconda.org/conda-forge/osx-arm64
                          https://conda.anaconda.org/conda-forge/noarch
                          [REDACTED]
       base environment : /Users/belastoyan/micromamba
               platform : osx-arm64

Logs

➜  mamba git:(main) ✗ ./bug.sh 
+ conda config --show-sources
==> /Users/belastoyan/.condarc <==
ssl_verify: False
channel_priority: strict
solver: libmamba

+ micromamba config sources
Configuration files (by precedence order):
~/.mambarc
~/.condarc
+ export CONDARC=/tmp/.condarc
+ CONDARC=/tmp/.condarc
+ conda config --show-sources
==> /Users/belastoyan/.condarc <==
ssl_verify: False
channel_priority: strict
solver: libmamba

+ micromamba config sources
Configuration files (by precedence order):
/tmp/.condarc (invalid)
+ micromamba --version
1.5.6
+ conda --version
conda 23.3.1

environment.yml

No response

~/.condarc

No response

[corneliusroemer]

Thanks for writing up this issue, it explains what's going on in issue #2135

[holzman]

I think I see what the issue is: compute_default_rc_sources does not get called when the environment variables are set. I think I can bang out a test and fix for this.

Actually, it will take me a little while longer: the precedence isn't quite right in compute_default_rc_sources - not just wrong for the env vars, but also the target prefix (we're adding rc files from CONDA_PREFIX too early).