bug#28088: "The name org.a11y.Bus was not provided by any .service files" with multiple applications

[Ludovic Courtès]

Hello!

iyzs...@member.fsf.org (宋文武) skribis:

> l...@gnu.org (Ludovic Courtès) writes:
>
>> Hi!
>>
>> iyzs...@member.fsf.org (宋文武) skribis:
>>
>>> GTK+ applications will provide accessibility support over this dbus
>>> service, so the AT-SPI clients (screen reader etc.) could use them.
>>>
>>> And this 'org.a11y.Bus' service can be auto activated by the dbus
>>> session daemon if the 'at-spi2-core' package is available.  If not,
>>> we'll get thoese warnning from applications.
>>
>> It does sound like our GuixSD setup fails to activate org.a11y.Bus
>> though.  Should we add a service in %desktop-services that extends
>> ‘dbus-root-service-type’ with ‘at-spi2-core’ to ensure that
>> auto-activation works?
>
> It's not a dbus system service, we can extend 'profile-service-package'
> with 'at-spi2-core' to make it available for the user's dbus session
> daemon.

Right.  In fact our ‘gnome’ package already propagates ‘at-spi2-core’
but not Orca.  Should we do this:

diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 43547961b..a95214317 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -5827,6 +5827,7 @@ associations for GNOME.")
("font-cantarell",font-cantarell)
("font-dejavu"   ,font-dejavu)
("at-spi2-core"  ,at-spi2-core)
+   ("orca"  ,orca)
("dbus"  ,dbus)
("dconf" ,dconf)
("desktop-file-utils",desktop-file-utils)

?

What about Xfce?

There’s still a problem for people not using GNOME/Xfce, but maybe we
can’t address it in the same way (and maybe Orca is not the right tool
either for those users; I see that we lack brltty for instance.)

Thanks,
Ludo’.

bug#28088: "The name org.a11y.Bus was not provided by any .service files" with multiple applications

[宋文武]

l...@gnu.org (Ludovic Courtès) writes:

> Hi!
>
> iyzs...@member.fsf.org (宋文武) skribis:
>
>> GTK+ applications will provide accessibility support over this dbus
>> service, so the AT-SPI clients (screen reader etc.) could use them.
>>
>> And this 'org.a11y.Bus' service can be auto activated by the dbus
>> session daemon if the 'at-spi2-core' package is available.  If not,
>> we'll get thoese warnning from applications.
>
> It does sound like our GuixSD setup fails to activate org.a11y.Bus
> though.  Should we add a service in %desktop-services that extends
> ‘dbus-root-service-type’ with ‘at-spi2-core’ to ensure that
> auto-activation works?

It's not a dbus system service, we can extend 'profile-service-package'
with 'at-spi2-core' to make it available for the user's dbus session
daemon.

>
> I think we should strive to provide accessible environments when
>possible, as with GNOME.

Yes, but without a client (we only have 'orca') the AT-SPI service alone
is not useful, maybe we should add Orca to both GNOME and Xfce? (I'm not
a user of any, so can't be sure.)

bug#28088: "The name org.a11y.Bus was not provided by any .service files" with multiple applications

[Ludovic Courtès]

Hi!

iyzs...@member.fsf.org (宋文武) skribis:

> GTK+ applications will provide accessibility support over this dbus
> service, so the AT-SPI clients (screen reader etc.) could use them.
>
> And this 'org.a11y.Bus' service can be auto activated by the dbus
> session daemon if the 'at-spi2-core' package is available.  If not,
> we'll get thoese warnning from applications.

It does sound like our GuixSD setup fails to activate org.a11y.Bus
though.  Should we add a service in %desktop-services that extends
‘dbus-root-service-type’ with ‘at-spi2-core’ to ensure that
auto-activation works?

I think we should strive to provide accessible environments when
possible, as with GNOME.

Thanks,
Ludo’.

bug#28088: "The name org.a11y.Bus was not provided by any .service files" with multiple applications

[宋文武]

ng0  writes:

> ng0 transcribed 1.6K bytes:
>> Upon starting for example emacs in spectrwm I get this message:
>> [1]   Doneemacs
>> user@abyayala ~$
>> ** (emacs-25-2:19121): WARNING **: Error retrieving accessibility
>> bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name
>> org.a11y.Bus was not provided by any .service files
>> 
>> It works alright, but I have seen the exact same message while
>> trying to figure out why mate-terminal does not start.
>> -- 
>> ng0
>> GnuPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588
>> GnuPG: https://n0is.noblogs.org/my-keys
>> https://www.infotropique.org https://krosos.org
>
> It is worth mentioning that this only happens with a
> desktop-services ressembling services list + no xfce-service
> or gnome-service in the system config.
>
> Reconfiguring and adding GNOME, switching tp GNOME makes
> this message not appear. We need to narrow down where
> this error comes from.

GTK+ applications will provide accessibility support over this dbus
service, so the AT-SPI clients (screen reader etc.) could use them.

And this 'org.a11y.Bus' service can be auto activated by the dbus
session daemon if the 'at-spi2-core' package is available.  If not,
we'll get thoese warnning from applications.

Usually they're harmless, and can be suppressed by set the environment
variable 'NO_AT_BRIGE=1'.

bug#28088: "The name org.a11y.Bus was not provided by any .service files" with multiple applications

[ng0]

Upon starting for example emacs in spectrwm I get this message:
[1]   Doneemacs
user@abyayala ~$
** (emacs-25-2:19121): WARNING **: Error retrieving accessibility bus address: 
org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not 
provided by any .service files

It works alright, but I have seen the exact same message while
trying to figure out why mate-terminal does not start.
-- 
ng0
GnuPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588
GnuPG: https://n0is.noblogs.org/my-keys
https://www.infotropique.org https://krosos.org


signature.asc
Description: PGP signature