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From: Andy Wingo <wingo@igalia.com>
Subject: Re: MIME database
Date: Tue, 28 Nov 2017 11:13:40 +0100
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In-Reply-To: <87k1ya3gdy.fsf@gnu.org> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
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On Tue 28 Nov 2017 10:24, ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> Hello,
>
> (Moving the discussions to guix-devel.)
>
> brendan.tildesley@openmailbox.org skribis:
>
>> I was wondering why my pdf documents were getting opened in Gimp by
>> default instead of Evince, so I investigated xdg-open and found it
>> uses mimeopen as a fallback, and packaged it. Turns out it didn't make
>> a difference and the issue was simply that the generated
>> mimedata.cache in xdg-mime-database had Gimp listed before Evince.
>
> Oh, good catch.  Profile generation is sensitive to package order; so
> indeed, if GIMP comes first, it =E2=80=9Cwins.=E2=80=9D

I had this problem with e.g. Nautilus vs Baobab on directories.
Apparently the right solution is to install a desktop-specific package
that manually does "tie-breaking" for MIME types that have multiple
handlers.  See 96d36f385cb1de83f95dd0404dc2166d6f877389.  You might try
just installing gnome-default-applications, or we might have a similar
package.

Andy