conda.csh sets $prompt for non-interactive ssh

[nealdevine]

Current Behavior

I scp or run non-interactive ssh command to a user@host with user having tcsh shell.
The system runs /etc/csh.cshrc which calls /etc/profile.d/*.csh including conda.csh (conda/shell/etc/profile.d/conda.csh) which I believe causes $?prompt to be true via the set prompt="" line. Next my home dir .cshrc is called which if $?prompt and ! $?TERM it calls setenv TERM `tset -Q -` which results in a error with message "tset: standard error: Inappropriate ioctl for device".
(I've removed that code from my .cshrc to work around this.)

Steps to Reproduce

# Run non-interactive ssh for user with tcsh shell on hosts with/without conda.csh:
ssh -q tcshuser@host_with_conda_csh 'echo $?prompt'
1
ssh -q tcshuser@host_wo_conda_csh 'echo $?prompt'
0

Expected Behavior

I believe conda.csh sets $prompt and thus changes $?prompt from 0 to 1 for non-interactive login which it should not. If you see the same behavior, the solution might be to replace line 21:
set prompt=""
with
unset prompt
or to remove the line, but I'm not sure what the purpose of that line is, and it is also possible that some another /etc/profile.d/*.csh on my host is resetting $prompt in which case this is not a bug in conda.csh.

Environment Information

`conda info`

     active environment : None
            shell level : 0
       user config file : /home/v2nrt3/.condarc
 populated config files : /usr/share/conda/condarc.d/defaults.yaml
          conda version : 4.6.13
    conda-build version : not installed
         python version : 3.6.8.final.0
       base environment : /usr  (read only)
           channel URLs : https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/free/linux-64
                          https://repo.anaconda.com/pkgs/free/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /var/cache/conda/pkgs
                          /home/v2nrt3/.conda/pkgs
       envs directories : /home/v2nrt3/.conda/envs
                          /usr/envs
               platform : linux-64
             user-agent : conda/4.6.13 requests/2.12.5 CPython/3.6.8 Linux/3.10.0-957.21.3.el7.x86_64 centos/7.7.1908 glibc/2.17
                UID:GID : 1348:20
             netrc file : None
           offline mode : False

`conda config --show-sources`

==> /usr/share/conda/condarc.d/defaults.yaml <==
pkgs_dirs:
  - /var/cache/conda/pkgs
  - ~/.conda/pkgs

`conda list --show-channel-urls`

EnvironmentLocationNotFound: Not a conda environment: /usr

[github-actions]

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