GNU bug report logs - #78378
[PATCH 0/2] home: services: Build "files" union allowing dangling symlinks.

Previous Next

Full log

Message #17 received at 78378 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Sergey Trofimov <sarg <at> sarg.org.ru>
Cc: Hilton Chain <hako <at> ultrarare.space>,
 Janneke Nieuwenhuizen <janneke <at> gnu.org>,
 Tanguy Le Carrour <tanguy <at> bioneland.org>, 78378 <at> debbugs.gnu.org,
 Andrew Tropin <andrew <at> trop.in>
Subject: Re: [bug#78378] [PATCH 2/2] home: services: Build "files" union
 allowing dangling symlinks.
Date: Sun, 18 May 2025 22:28:30 +0200

Hi Sergey,

Sergey Trofimov <sarg <at> sarg.org.ru> writes:

> * gnu/home/services.scm (files->files-directory): Build file union
> without checking for existence of included items.
>
> * tests/guix-home.sh: Verify symlinking files out of store works.
>
> Change-Id: I94054003f4a6be944252ce7a397cf56f0b979554

[...]

> @@ -343,7 +343,21 @@ (define (files->files-directory files)
>    ;; leading to a build failure of "files.drv".
>    (assert-no-duplicates files)
>  
> -  (file-union "files" files))
> +  ;; Compute the file-union allowing dangling symlinks
> +  ;; This enables creating symlinks to locations out of store
> +  (computed-file
> +   "files"
> +   (with-imported-modules '((guix build utils))
> +     #~(begin
> +         (use-modules (guix build utils)
> +                      (ice-9 match))
> +         (mkdir #$output)
> +         (chdir #$output)
> +         (for-each (match-lambda
> +                     ((target source)
> +                      (mkdir-p (dirname target))
> +                      (symlink source target)))
> +                   '#$files)))))

Instead of more or less duplicating ‘file-union’, how about adding a
#:dangling-symlinks? argument to ‘file-union’ that would default to #f?

When set to #t, the ‘stat’ call would not be emitted.

That would reduce code duplication and make the intent clearer IMO.

Ludo’.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.