zellij hangs when run from a fish function

[ghost]

I want a fish function that does the following:

• stores current directory in session_name
• checks if a session with name "session_name" exists
  • if so, attach to it
  • if not, create a new session with name "session_name" and strider layout

My nixcode to do this is as follows:

       programs.fish.functions.za = ''
          if status is-interactive
            set session_name (pwd | sd "/" "_")
            if rg "^$session_name\$" (command zellij list-sessions | psub)
              echo attempting to attach to existing session
              exec zellij attach $session_name
            else
              echo attempting to start new session
              exec zellij --session $session_name --layout strider
            end
          end
        '';

I get expected behaviour until the zellij calls. At this point the function hangs. How do I fix this?

[ghost]

It seems like this is related to #2591.

The function works as expected when run from root.

[ghost]

My solution was to name the session using the base64 encoded sha1 of the current directory (openssl sha1 -binary (pwd | psub) | base64). This will always yield a session name of 29 chars (which is within the limits provided by empirical tests in #2591).

A birthday attack on the sha1 is not a problem as I intend to use far less than 2^159 sessions concurrently.