Play more nicely with OrbStack on macOS

[cstrahan]

OrbStack allows for running Docker containers and Linux "machines" on macOS. One of the nice features is that many of the host's top level directories are mounted into the guest Linux VM, including /Users. This allows for you to be in a directory like ~/src/my-project from a regular macOS shell, run something like orb -m ubuntu to drop into a shell running at /Users/${USER}/src/my-project within the guest, and transparently read/write files in both directions (this user directory shouldn't be mistaken for the guest user's home directory, which would be somethiing like /home/${USER}).

Here's the problem, though: within the guest, mise will find and use the /Users/${USER}/.config/mise/config.toml, which will override what should be the default user config at /home/${USER}/.config/mise/config.toml. This confuses things, where mise will do things like see your mise use -g node@16 and find that node@16 is already set, and thus not install/reshim/etc as needed within the guest.

I can see two solutions:

1. Make the path(s) used as default user-level configuration not coincide with the config file search paths, or
2. Provide a special case for OrbStack (and other systems employing a VFS to mount host directories into containers/vms), something like this: if the mise binary is running on (i.e. compiled for) Linux, and the current working directory is under /Users, assume that the scenario is as I describe here, and preclude/reject files like /Users/${USER}/.config/mise/config.toml from the search path.

Would either of these solutions be accepted? It would make usage much more straightforward if mise would not pick up the config file intended as user-level config for the host OS's user, when running within a guest VM.

[cstrahan]

Actually, it looks like I can work around this fairly elegantly using MISE_CEILING_PATHS:

/Users/charles.strahan
% mise config        
Path                                             Tools                                                                                                                            
~/.config/mise/config.toml                       aqua:fd, node, aqua:bat, aqua:delta, aqua:ripgrep, aqua:lsd                                                                      
/Users/charles.strahan/.config/mise/config.toml  node, python, usage, ruby, aqua:ripgrep, aqua:fd, aqua:delta, aqua:bat, aqua:lsd, aqua:yamlfmt, aqua:taplo, aqua:numtide/treefmt 

/Users/charles.strahan
% MISE_CEILING_PATHS=/Users/charles.strahan mise config
Path                        Tools                                                       
~/.config/mise/config.toml  aqua:fd, node, aqua:bat, aqua:delta, aqua:ripgrep, aqua:lsd

[cstrahan]

Hmm... I've tried to remove the need for having the MISE_CEILING_PATHS env var set by tweaking the miserc, but that doesn't seem to work.

I tried this:

# in ~/.config/mise/miserc.toml
[settings]
ceiling_paths = ["/Users/charles.strahan"]

and I've also tried:

# in /etc/mise/miserc.toml
[settings]
ceiling_paths = ["/Users/charles.strahan"]

But I still see:

/Users/charles.strahan
% mise config
Path                                             Tools                                                                                                                            
~/.config/mise/config.toml                       aqua:fd, node, aqua:bat, aqua:delta, aqua:ripgrep, aqua:lsd                                                                      
/Users/charles.strahan/.config/mise/config.toml  node, python, usage, ruby, aqua:ripgrep, aqua:fd, aqua:delta, aqua:bat, aqua:lsd, aqua:yamlfmt, aqua:taplo, aqua:numtide/treefmt

[cstrahan]

For now, this is what I've settled on, in my ~/.zshenv:

# If we're not on macOS,
# and we have a /Users directory (likely mounted via OrbStack from a host macOS),
# then configure mise to ignore /Users/*.
# https://github.com/jdx/mise/discussions/8433
if [[ ${OSTYPE} != darwin* ]] && [[ -d /Users ]]; then
  export MISE_CEILING_PATHS=${(j.:.)$(echo /Users/*(/N))}
fi