[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[ԜаӀtеr Ⅼарсһуnѕkі]

** No longer affects: lubuntu-default-settings

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

> @handsome_feng: Since Kylin will ship both fcitx 4 and fcitx 5 in 21.10, I'm 
> thinking that Kylin
> would be a perfect platform for testing this input configuration. So it would 
> be good if you
> could include some testing also of fcitx 5 and be attentive to possible 
> issues in light of the
> fact that it loads the fcitx 4 im modules instead of the fcitx 5 ones.

Okay, we will test it in the near future, and if there are any problems,
we will feedback here.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

** Changed in: snappy
   Status: New => Invalid

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

On 2021-06-08 08:54, James Henstridge wrote:
>> Is there such a snap you could point me to so I can test?
> 
> The candidate channel of the gedit snap is built with core20 and the
> gnome-3-38-2004 platform snap.  But as I said, I don't think that
> platform snap currently includes the fcitx5 input module.

Right.

$ ls 
/snap/gnome-3-38-2004/current/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules 
| grep fcitx
im-fcitx.so

So then let's consider that a separate matter to be addressed later.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[James Henstridge]

> Is there such a snap you could point me to so I can test?

The candidate channel of the gedit snap is built with core20 and the
gnome-3-38-2004 platform snap.  But as I said, I don't think that
platform snap currently includes the fcitx5 input module.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

So it was changed in im-config. In Debian the change was uploaded to
experimental instead of unstable/bullseye for now, since the principal
fcitx package maintainer Shengjing Zhu senses some degree of
uncertainty. He wants to give the users some time to provide feedback
before changing it in bullseye (Debian 11).

@handsome_feng: Since Kylin will ship both fcitx 4 and fcitx 5 in 21.10,
I'm thinking that Kylin would be a perfect platform for testing this
input configuration. So it would be good if you could include some
testing also of fcitx 5 and be attentive to possible issues in light of
the fact that it loads the fcitx 4 im modules instead of the fcitx 5
ones.

@James: Leaving the just mentioned uncertainty aside, we can conclude
that there seems to be no need to make any changes to the core18 based
platform snaps. An upstream change was made in fcitx5 5.0.5 with the
explicit purpose to deal with e.g. snaps where only fcitx 4 im modules
are present; see .

But it would be good if we somehow could test to confirm that fcitx 5
works with a core20 based platform snap without modifying the apparmor
abstractions for fcitx.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Launchpad Bug Tracker]

This bug was fixed in the package im-config - 0.47-1

---
im-config (0.47-1) experimental; urgency=medium

  * Team upload
  * Bug script tweaks

  [ Shengjing Zhu ]
  * Change IM_MODULE env for fcitx5 to "fcitx" (closes: #977203,
LP: #1928360)

 -- Gunnar Hjalmarsson   Mon, 07 Jun 2021 09:38:38
+0200

** Changed in: im-config (Ubuntu)
   Status: New => Fix Released

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

On 2021-06-05 06:32, James Henstridge wrote:
> It's probably going to be easiest to see if we can get things
> working with a core20 based platform snap though, since we have
> fcitx5 packages there (albeit for a git prerelease version).

Is there such a snap you could point me to so I can test?

> For the core18 based platform snaps, we would need to backport the
> fcitx5 packages themselves.  Alternatively, I wonder if we could get
> away with symlinking the old module name to the new one?

The latter would be equivalent to assign "fcitx" instead of "fcitx5" to
the IM_MODULE variables if I understand it correctly.

The Fcitx 5 folks upstream recommend "fcitx" for IM_MODULE. The reason
why Debian/Ubuntu currently set "fcitx5" is to deal with systems during
a transition period where both fcitx 4 and fcitx 5 are installed. In
such cases "fcitx" would result in the fcitx 4 im modules being loaded
also when the user runs fcitx 5, and we have assumed that that might be
problematic.

OTOH, my successful test with Chromium indicates that it works. Now I'm
not the right person to evaluate it, since I'm not an input method user,
and that's what I want to talk with the Chinese developers in Debian's
input method team about.

@handsome_feng: Maybe the Kylin team can help to test this, considering
that Kylin will be shipped with both fcitx 4 and fcitx 5 in 21.10. If
you override im-config and enforce GTK_IM_MODULE and QT_IM_MODULE to be
assigned "fcitx" also when using fcitx 5, do you see any adverse side
effects?

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[James Henstridge]

I hadn't realised that they renamed the IM module with the version bump:
that means snaps built against older platforms won't load the old (but
working) Fcitx 4 module when run on a host system configured with Fcitx
5.

We can certainly look at adding the new IM module to the platform snaps,
but that will also switch to the new IPC protocol.  From a quick look
through the source it will probably be allowed by existing AppArmor
rules in the "desktop" interface, but that will need testing.

It's probably going to be easiest to see if we can get things working
with a core20 based platform snap though, since we have fcitx5 packages
there (albeit for a git prerelease version).

For the core18 based platform snaps, we would need to backport the
fcitx5 packages themselves.  Alternatively, I wonder if we could get
away with symlinking the old module name to the new one?

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Re: [apparmor] [Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Seth Arnold]

On Sat, Jun 05, 2021 at 01:27:19AM -, Gunnar Hjalmarsson wrote:
> It means that it explicitly looks for the fcitx 5 gtk im module, while
> Chromium only has access to the fcitx 4 one.

Oh! Excellent debugging to find the root cause.

Thanks

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

I presented the snap problem for James Henstridge, and he gave me a very
useful hint: The Chromium snap makes use of the bionic library stack
(the gnome-3-28-1804 snap) including the im module installed by fcitx-
frontend-gtk3, i.e. the fcitx 4 gtk im module.

That made me think of . That bug is
still open, and as a result im-config currently sets these variables for
fcitx 5:

GTK_IM_MODULE=fcitx5
XMODIFIERS=@im=fcitx
QT_IM_MODULE=fcitx5

It means that it explicitly looks for the fcitx 5 gtk im module, while
Chromium only has access to the fcitx 4 one.

So as a test I tweaked im-config to set:

GTK_IM_MODULE=fcitx
XMODIFIERS=@im=fcitx
QT_IM_MODULE=fcitx

and that made a difference. With that environment I could successfully
input beautiful Chinese characters in Chromium using fcitx 5. :)

Consequently there seems to be no need to add any extra stuff to
apparmor to handle fcitx 5. Instead I see two options:

1. Change im-config's variable assignment, or

2. somehow add the fcitx 5 im modules for gtk and qt to the snap library
stack.

I'm going to consult with Debian's input method team about which route
is preferable.

@James: Do you see a problem from your POV with adding the fcitx 5 im
modules to the snaps?

** Bug watch added: Debian Bug tracker #977203
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977203

** Also affects: snappy
   Importance: Undecided
   Status: New

** Package changed: apparmor (Ubuntu) => im-config (Ubuntu)

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Seth Arnold]

Gunnar, indeed, it had much less in it than I expected; I don't know
much about the snap packaging for Chromium, but it looked to me like it
was trying to do bluetooth things and that's all that was denied.

I'm no fcitx expert but I didn't think it looked related.

Thanks

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

@Seth: I suppose that the DENIED file I attached in comment #7 does not
help much.

Fcitx 5 is a separate process, i.e. /usr/bin/fcitx5 as opposed to
/usr/bin/fcitx. When in Chromium it behaves as if fcitx5 does not exist,
even if the process runs and I can use fcitx5 in other applications. I
can't even switch to a fcitx5 input method engine when in Chromium, let
alone use such an input engine for typing. Maybe that explains why
nothing fcitx5 related is reflected as DENIED lines.

I'm thinking that maybe there is a need to create the fcitx5 and
fcitx5-strict abstractions using the already existing fcitx and fcitx-
strict abstractions as models.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Launchpad Bug Tracker]

This bug was fixed in the package language-selector - 0.212

---
language-selector (0.212) impish; urgency=medium

  * data/pkg_depends:
- Don't pull Fcitx for non-Chinese languages. This is consistent
  with the IM_CONFIG_PREFERRED_RULE variable in
  /etc/default/im-config.
- Pull IBus IMs for Chinese also on Ubuntu Budgie
- Switch to Fcitx 5 for Chinese (LP: #1928360)

 -- Gunnar Hjalmarsson   Fri, 21 May 2021 06:41:05
+0200

** Changed in: language-selector (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

Thanks handsome_feng!

The Kylin discussion makes me confident that it's fine for Lubuntu as
well. The Lubuntu situation is different, though, since im-config is
disabled by default unless a Chinese locale is in effect. This discourse
topic comes to mind:

https://discourse.ubuntu.com/t/default-im-config-configuration/17136

I'm still interested in talking with some Lubuntu developer on that. But
the outcome of such a discussion would affect other packages but
language-selector, so I just pushed and uploaded the proposed change.

** Changed in: language-selector (Ubuntu)
   Status: In Progress => Fix Committed

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

> Does this mean that the proposed changes to pkg_depends is fine from
> an Ubuntu Kylin POV, and that no further changes are needed?

Yes, Thanks!

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

On 2021-05-20 15:39, handsome_feng wrote:
> With the fcitx items in the current seed, I think pkg_depends don't
> need to pull in the fcitx 4 packages for Ubuntu Kylin 21.10,

Ok, good.

> also it's okay to pull in the fcitx 5 packages, since the im-config
> will set the default input method to fcitx 4 for Ubuntu Kylin 21.10?

Hmm.. Yes, AFAIK that would work. fcitx 4 and fcitx 5 can co-exist, and
if both are installed im-config will pick fcitx 4 by default (can be
changed by the user via Language Support).

Does this mean that the proposed changes to pkg_depends is fine from an
Ubuntu Kylin POV, and that no further changes are needed?

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

Hi,

With the fcitx items in the current seed, I think pkg_depends don't need
to pull in the fcitx 4 packages for Ubuntu Kylin 21.10, also it's okay
to pull in the fcitx 5 packages, since the im-config will set the
default input method to fcitx 4 for Ubuntu Kylin 21.10?

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

@handsome_feng: Great! I have a follow-up question then:

In the desktop seed of Ubuntu Kylin I see these packages:

 * (im-config)
 * (fcitx)
 * (fcitx-frontend-gtk2)
 * (fcitx-frontend-gtk3)
 * (fcitx-frontend-qt5)
 * (fcitx-ui-classic)
 * (fcitx-table)
 * (fcitx-module-cloudpinyin)
 * (fcitx-googlepinyin)

Given that, will it work with the proposed version of pkg_depends, or is
there a reason to keep letting also pkg_depends pull a bunch of fcitx 4
packages for Kylin in 21.10?

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

> Would that plan make sense to you?

This is a good way for us, we agree with it, thanks a lot!

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

@handsome_feng: I suppose it is possible. Of course it would have been
desirable to do it in 21.10 to get more time to identify possible issues
before next LTS, but OTOH I know that Sogou is considered important on
Kylin.

Thinking... Maybe we can have it both ways. :) What I mean is that we
could do it now for other flavors, but tell language-selector to not
pull fcitx5 packages on Kylin for now. im-config will keep supporting
both fcitx 4 and 5, and then we would still have reasons to identify and
fix fcitx5 issues with the apparmor profiles in the 21.10 development
cycle.

Would that plan make sense to you?

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

Hi, Gunnar,

After talking to our partners such as Sogou, they want to postpone this
migration until 22.04 so that they have enough time to work on the
adaptation, is this possible?

Thanks,
handsome_feng

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[handsome_feng]

** Changed in: ubuntukylin
   Status: New => In Progress

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

Sure, Seth, attached please find the output from

cat /var/log/audit/audit.log | grep DENIED

** Attachment added: "apparmor_denied-lines_chromium.txt"
   
https://bugs.launchpad.net/ubuntu/+source/language-selector/+bug/1928360/+attachment/5498578/+files/apparmor_denied-lines_chromium.txt

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Re: [apparmor] [Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Seth Arnold]

On Tue, May 18, 2021 at 07:39:48PM -, Gunnar Hjalmarsson wrote:
> On 2021-05-16 22:23, Gunnar Hjalmarsson wrote:
> > As regards apparmor it's possible that no change is needed.
> 
> Well, I simply tested with the Chromium snap. fcitx5 does not work in
> Chromium, while fcitx4 does. So something needs to be done.

Excellent, can you paste the DENIED lines from your test into the bug
report?

Thanks

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

On 2021-05-16 22:23, Gunnar Hjalmarsson wrote:
> As regards apparmor it's possible that no change is needed.

Well, I simply tested with the Chromium snap. fcitx5 does not work in
Chromium, while fcitx4 does. So something needs to be done.

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

As regards apparmor it's possible that no change is needed. fcitx5
creates the folder

~/.config/fcitx/dbus

(i.e. not ~/.config/fcitx5/dbus) with a long file name whose contents is
"unix:path=/run/user/1000/bus". Not sure how to safely confirm that,
though.

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Title:
  Switch to Fcitx 5 for Chinese

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

I submitted a merge proposal with suggested changes to language-selector
(pkg_depends). Please review and give feedback.

** Changed in: language-selector (Ubuntu)
   Status: New => In Progress

** Changed in: language-selector (Ubuntu)
 Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

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Title:
  Switch to Fcitx 5 for Chinese

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Launchpad Bug Tracker]

** Merge proposal linked:
   
https://code.launchpad.net/~gunnarhj/ubuntu/+source/language-selector/+git/language-selector/+merge/402791

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Title:
  Switch to Fcitx 5 for Chinese

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

It struck me that Lubuntu, which ships Fcitx by default, has a special
interest in this change, so added a Lubuntu bug task.

** Also affects: lubuntu-default-settings
   Importance: Undecided
   Status: New

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Title:
  Switch to Fcitx 5 for Chinese

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[Bug 1928360] Re: Switch to Fcitx 5 for Chinese

[Gunnar Hjalmarsson]

Assuming that this may require apparmor changes, I added an apparmor
(Ubuntu) bug task.

** Also affects: apparmor (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  Switch to Fcitx 5 for Chinese

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