GNU bug report logs - #54784
Flatpak GTK apps cannot show pictures.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#54784: closed (Flatpak GTK apps cannot show pictures. )
Date: Thu, 28 Apr 2022 14:56:02 +0000

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Your message dated Thu, 28 Apr 2022 16:55:19 +0200
with message-id <87a6c5cl60.fsf <at> gnu.org>
and subject line Re: bug#55072: [PATCH]: Do not leak GDK_PIXBUF_MODULE_FILE into the sandbox.
has caused the debbugs.gnu.org bug report #54784,
regarding Flatpak GTK apps cannot show pictures. 
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
54784: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54784
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Zhu Zihao <all_but_last <at> 163.com>
To: "bug-guix <at> gnu.org" <bug-guix <at> gnu.org>
Subject: Flatpak GTK apps cannot show pictures. 
Date: Fri, 08 Apr 2022 12:35:42 +0800

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# Main issue

Solanum in flatpak failed to render its logo.

# Reproduce step

Run

```
guix shell flatpak
flatpak install org.gnome.Solanum
flatpak run org.gnome.Solanum
```

# Investigation

The issue maybe caused by missing gdk pixbuf loaders. Try `flatpak run
--command=sh --devel org.gnome.Solanum` enter the debug shell of flatpak
and run `strace -o s.log solanum`. Found something like

```
openat(AT_FDCWD, "/run/current-system/profile/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache",
O_RDONLY) = -1 ENOENT (没有那个文件或目录)
...

access("/run/current-system/profile/share/themes/Adwaita/gtk-4.6/gtk.css", F_OK) = -1 ENOENT (没有那个文件或目录)
access("/run/current-system/profile/share/themes/Adwaita/gtk-4.4/gtk.css", F_OK) = -1 ENOENT (没有那个文件或目录)
access("/run/current-system/profile/share/themes/Adwaita/gtk-4.2/gtk.css", F_OK) = -1 ENOENT (没有那个文件或目录)
access("/run/current-system/profile/share/themes/Adwaita/gtk-4.0/gtk.css", F_OK) = -1 ENOENT (没有那个文件或目录)

...

openat(AT_FDCWD, "/run/current-system/profile/lib/gio/modules", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = -1 ENOENT (没有那个文件或目录)
```

It shows that flatpak is trying to load GTK related resource from
/run/current-system/profile. And use

```
flatpak run --filesystem=/gnu/store:ro --filesystem=/run/current-system:ro org.gnome.Solanum
```

It works well.

# Related links

https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/flatpak/bubblewrap-paths.patch

The solution of Nixpkgs is add these path and store to the flatpak
sandbox. I'm not sure whether it's good or not. Because user may want to
setup its own GUIX{2,3,4}_GTK_PATH and GDK_PIXBUF_LOADER_FILES.
-- 
Retrieve my PGP public key:

  gpg --recv-keys D47A9C8B2AE3905B563D9135BE42B352A9F6821F

Zihao

[signature.asc (application/pgp-signature, inline)]

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Zhu Zihao <all_but_last <at> 163.com>
Cc: 55072-done <at> debbugs.gnu.org, 54784-done <at> debbugs.gnu.org
Subject: Re: bug#55072: [PATCH]: Do not leak GDK_PIXBUF_MODULE_FILE into the
 sandbox.
Date: Thu, 28 Apr 2022 16:55:19 +0200

Hi,

Zhu Zihao <all_but_last <at> 163.com> skribis:

>>From affd34d0f0bf6bf04110b595ce77ed8e9448b2c7 Mon Sep 17 00:00:00 2001
> From: Zhu Zihao <all_but_last <at> 163.com>
> Date: Thu, 21 Apr 2022 18:48:51 +0800
> Subject: [PATCH 1/3] gnu: bubblewrap: Update to 0.6.1.
>
> * gnu/packages/virtualization.scm (bubblewrap): Update to 0.6.1.

Applied to the ‘staging’ branch, due to the high number of rebuilds.

>>From 3432b64e34d5df329c31b1a09f476ff01a743245 Mon Sep 17 00:00:00 2001
> From: Zhu Zihao <all_but_last <at> 163.com>
> Date: Thu, 21 Apr 2022 18:52:21 +0800
> Subject: [PATCH 2/3] gnu: flatpak: Use G-expressions.
>
> * gnu/packages/package-management.scm (flatpak): Fix indentation.
> [arguments]: Use G-expressions.

[...]

>>From 5f1369f8731cc1b35c3c80aac6ad7ebd89d3cb10 Mon Sep 17 00:00:00 2001
> From: Zhu Zihao <all_but_last <at> 163.com>
> Date: Sat, 23 Apr 2022 10:39:32 +0800
> Subject: [PATCH 3/3] gnu: flatpak: Do not leak GDK_PIXBUF_MODULE_FILE into the
>  sandbox.
>
> Fixes https://issues.guix.gnu.org/54784.
>
> * gnu/packages/patches/flatpak-unset-gdk-pixbuf-for-sandbox.patch: New file.
> * gnu/local.mk (dist_patch_DATA): Add corresponding entry.
> * gnu/packages/package-management.scm (flatpak)[source]: Use patch.

Applied to ‘master’.

Thanks!

Ludo’.

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