bug#39711: Epiphany fails to launch Evince

[Maxim Cournoyer]

Hi,

Ludovic Courtès <ludo@gnu.org> writes:

> Hello,
>
> When running Epiphany on a non-GNOME system with:
>
>   guix environment --ad-hoc epiphany -- epiphany
>
> and opening a PDF, it fails to launch Evince (referred to as
> “Dokumentmontrilo” below :-)) and crashes:
>
> $ guix environment --ad-hoc epiphany -- epiphany
>
> ** (epiphany:2419): WARNING **: 09:33:46.938: 
> webkit_web_context_set_web_process_count_limit is deprecated and does 
> nothing. Limiting the number of web processes is no longer possible for 
> security reasons
> ** Message: 09:33:47.162: Remote error from secret service: 
> org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.secrets 
> was not provided by any .service files
>
> ** (epiphany:2419): WARNING **: 09:33:47.162: Failed to search secrets in 
> password schema: The name org.freedesktop.secrets was not provided by any 
> .service files
>
> ** (epiphany:2419): WARNING **: 09:45:47.949: Failed to acquire session 
> inhibitor for active download. Is gnome-session running?
>
> ** (epiphany:2419): WARNING **: 09:45:51.859: Failed to launch 
> Dokumentmontrilo: No s'ha pogut executar el procés fill «gio-launch-desktop» 
> (Dosiero aŭ dosierujo ne ekzistas)
>
> (epiphany:2419): GLib-GIO-CRITICAL **: 09:45:51.860: g_app_info_launch_uris: 
> assertion 'G_IS_APP_INFO (appinfo)' failed
>
> The problem is that ‘gio-launch-desktop’ is not found in $PATH.

As of Epiphany 42, it doesn't rely on Evince anymore for viewing PDFs
(rather, it uses its PDF.js module).  But the problem seems to remain
that displaying PDFs in Epiphany fails outside of GNOME.  On my
ratpoison session, it consistently crashes when visiting PDF URLs.

I'm not sure how to debug this further.

Thanks,

Maxim