IHP+Flake+Devenv up error opening sockets.

[Montmorency]

Describe the bug
When starting a development environment (standard ihp project) with devenv up and using the default devenv process manager I get an error:

{"level":"warn","error":"open /Users/.../Library/Application Support/process-compose/settings.yaml: no such file or directory","time":"2024-05-23T16:24:56+01:00","message":"Error reading settings file /Users/.../Library/Application Support/process-compose/settings.yaml"}
24-05-23 16:24:56.884 FTL start UDS http server on /tmp/nix-shell.0zxBNB/nix-shell.zEufCC/devenv-9f3dfbd/pc.sock failed error="listen unix /tmp/nix-shell.0zxBNB/nix-shell.zEufCC/devenv-9f3dfbd/pc.sock: bind: no such file or directory"

If I overwrite the default flake config to use a different process manager (overmind):

system    | Tmux socket name: overmind-ihp-ulhg-bsc-9Ue8XgkwBZMgn9gmIUT6a
system    | Tmux session ID: ihp-ulhg-bsc
system    | Listening at /tmp/nix-shell.0zxBNB/nix-shell.zEufCC/nix-shell.y3b8AK/devenv-9f3dfbd/overmind.sock
overmind: listen unix /tmp/nix-shell.0zxBNB/nix-shell.zEufCC/nix-shell.y3b8AK/devenv-9f3dfbd/overmind.sock: bind: no such file or directory

To reproduce
https://gist.github.com/Montmorency/81b4814ab914c9d7592c8883af41e07d

ihp-new

nix develop --impure

devenv up

The error seems to occur with process-compose and overriding the default to use overmind as process manager gives the error. It disappears in previous versions of the flake.

The flake can be changed:

                devenv.shells.default = {
                    process.implementation = "overmind"; # overrides process-compose
                    processes.frontend.exec = ''make watch-frontend'';
                    #process.implementation= "process-compose";
                    #processes.emacs.exec = ''emacs'';
                    #processes.frontend.process-compose = {
                    #                  command = "make watch-frontend";
                    #                  };
                };

Version
devenv: 1.0.4
Using the latest flake IHP configuration (https://github.com/digitallyinduced/ihp)
Paste the output of $ devenv version here or tell us if you're using flakes.

[sandydoo]

This the same issue as #1153. There's a PR to try to solve this #1157.

What's happening is that nix develop is modifying $TMPDIR after we evaluate the devenv shell. When you then run devenv up, we (currently) need to re-evaluate the config. This picks up the new $TMPDIR, but doesn't re-run the entire set up that creates temporary directories and so on.

One workaround is to use direnv instead of manually running nix develop. I think the IHP template ships with an .envrc for that. direnv will reset the TMPDIR for you.

[sandydoo]

@Montmorency, we've merged https://github.com/cachix/devenv/pull/1157/files. You'll have to override the devenv input to pick up the changes.

[Montmorency]

Thanks!