On 2022-04-07 20:21, Maxime Devos wrote:

> Andrew Tropin schreef op do 07-04-2022 om 20:01 [+0300]:
>> Idk how file-exists? works internally, but still expect it to be more
>> efficient than lstat.  That's why I decided to use lstat only as a
>> "fallback" option in `or` statement.
>
> Here's the definition, from module/ice-9/boot-9.scm (Guile source
> code):
>
> ;; For reference, Emacs file-exists-p uses stat in this same way.
> (define file-exists?
>   (if (provided? 'posix)
>       (lambda (str)
>         (->bool (stat str #f)))
>       [non-POSIX code that's not relevant to Guix]))
>
> 'file-exists?' just calls 'stat', a variant of 'lstat', so I don't
> think there are performance gains to be had here.  Well, the
> (stat ... #f) might not need to install an exception handler since it
> is written in C, but that seems at most a micro-optimisation to me.
>
> Greetings,
> Maxime.

Updated the implementation, which behaves similiar to file-exists?, but
not follow symlinks.