GNU bug report logs - #37955
warning: '.desktop' file refers to '', which cannot be found

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From: Brendan Tildesley <btild <at> mailbox.org>
To: "37955 <at> debbugs.gnu.org" <37955 <at> debbugs.gnu.org>
Cc: "mail <at> ambrevar.xyz" <mail <at> ambrevar.xyz>
Subject: bug#37955: warning: '.desktop' file refers to '', which cannot be found
Date: Fri, 9 Apr 2021 12:56:35 +0200 (CEST)

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The Exec paths in these files already refer to absolute paths, infact, /gnu/store paths
Thus the regex:

("^Exec=([^/[:blank:]\r\n]*)(.*)$" _ binary rest)

with binary = empty string and rest = everything after Exec=

Why? The second subexpression [^/[:blank:]\r\n]* is bound to binary, but it means anything
that is a series of anything that is not /, space, or newline. absolute paths start with /, so it matches nothing (empty string), and continues to call (which "").


I notice this phase hasn't been edited in 5 years and has other issues, for example:

1. patch-dot-desktop-files only searches the output of the package for paths, not the inputs. This means for example xfce4-settings fails to patch references to exo-open in desktop files.

The code should be remade to be more /correct/, and handle all unexpected inputs. In this case the phase is accidentally doing the right thing by failing in a harmless way and correctly not patching the files, but emitting a warning.

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