Speed up `setting up /etc...' about impermanence

[talyz]

Hi! That prompt isn't specific to impermanence. It's still possible that setting up bind mounts and symlinks is what's causing a slowdown when you're activating a new generation, but this would have to be profiled somehow. I don't see any easy way to improve that either - the scripts aren't doing anything that fancy or superfluous. The create-directories script checks the hierarchy of all added directories and files' parent directories, but I don't see any obvious way around that which wouldn't increase complexity immensely.

[shadowrylander]

Hmm... This might actually tie into my other issue here, whereupon adding /etc/ssh to the persistent directories prevents sshd_config from being generated; is it possible that that might be causing this immense slowdown?

[shadowrylander]

Also, if no subdirectories are mounted in /persist, such as directories = [ "/directory" "/directory/subdirectory" ];, would it not be possible to parallelize the command, such as using async, since there would be no race conditions?

Sorry if I'm misunderstanding something here!