GNU bug report logs - #76143
[PATCH] gnu: Canonicalize paths before comparing.

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Noé Lopez <noe <at> xn--no-cja.eu>
Cc: Josselin Poiret <dev <at> jpoiret.xyz>, Simon Tournier <zimon.toutoune <at> gmail.com>, Mathieu Othacehe <othacehe <at> gnu.org>, Tobias Geerinckx-Rice <me <at> tobias.gr>, 76143 <at> debbugs.gnu.org, Christopher Baines <guix <at> cbaines.net>
Subject: [bug#76143] [PATCH] gnu: Canonicalize paths before comparing.
Date: Sun, 09 Feb 2025 12:28:55 +0100

Hi,

Noé Lopez <noe <at> noé.eu> skribis:

> --- a/gnu/packages.scm
> +++ b/gnu/packages.scm
> @@ -167,11 +167,12 @@ (define %patch-path
>    ;; Define it after '%package-module-path' so that '%load-path' contains user
>    ;; directories, allowing patches in $GUIX_PACKAGE_PATH to be found.
>    (make-parameter
> -   (map (lambda (directory)
> -          (if (string=? directory %distro-root-directory)
> -              (string-append directory "/gnu/packages/patches")
> -              directory))
> -        %load-path)))
> +   (let ((root (try-canonicalize-path %distro-root-directory)))
> +     (map (lambda (directory)
> +            (if (string=? (try-canonicalize-path directory) root)
> +                (string-append directory "/gnu/packages/patches")
> +                directory))
> +          %load-path))))

I’m not sure what the goal is but please keep in mind that
‘canonicalize-path’ is expensive in terms of system calls (especially if
‘%load-path’ is long, and we’d pay it for all program startup times),
and that the comparison here remains brittle (checking the dev/ino
fields of ‘stat’ would be more accurate).

Thanks,
Ludo’.

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