Describe the bug

I cannot seem to use any Nix commands that work with a remote store over SSH or SSH-NG using the Fish shell.

Steps To Reproduce

❯ SHELL=$(which fish) nix store ping --store ssh://nixie
Store URL: ssh://nixie
error: failed to start SSH connection to 'nixie'

❯ SHELL=$(which bash) nix store ping --store ssh://nixie
Store URL: ssh://nixie

It matters what is $SHELL in the environment and not actually the current active shell.
This took me a long time to figure out the culprit but I'm not sure the cause.

Expected behavior

Should work regardless of shell.

nix-env --version output

nix-env (Nix) 2.18.2

Additional context

Running NixOS 24.05

Priorities

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