GNU bug report logs - #48067
28.0.50; Tramp error: cannot determine gio monitor

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Tramp error: cannot determine gio monitor
Date: Tue, 27 Apr 2021 16:58:24 +0000

When adding a file-notify watcher to a remote directory in helm-find-files, I
have an error "cannot determine gio monitor":

Debugger entered--Lisp error: (file-error "Cannot determine gio monitor")
  signal(file-error ("Cannot determine gio monitor"))
  tramp-sh-gio-monitor-process-filter(#<process gio> "\n(gio monitor:15942): GLib-GIO-\33[1;33mWARNING\33[0m ...")
  [...]

This doesn't happen in emacs-27.2.
It happens in emacs-28 compiled with native-comp or not.

which gio returns /usr/bin/gio.

Any ideas?

Thanks.


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2021-04-27 built on IPadS340
Repository revision: 6fb80c9ad80bfc0db18285d6e23c3ee08e2aa657
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Linux Mint 19.3

Configured using:
 'configure CFLAGS=-O8 --with-mailutils --with-cairo
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Configured features:
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<#secure method=pgpmime mode=sign>

-- 
Thierry

Message #8 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Tue, 27 Apr 2021 21:19:55 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

> When adding a file-notify watcher to a remote directory in helm-find-files, I
> have an error "cannot determine gio monitor":
>
> Debugger entered--Lisp error: (file-error "Cannot determine gio monitor")
>   signal(file-error ("Cannot determine gio monitor"))
>   tramp-sh-gio-monitor-process-filter(#<process gio> "\n(gio monitor:15942): GLib-GIO-\33[1;33mWARNING\33[0m ...")
>   [...]
>
> This doesn't happen in emacs-27.2.
> It happens in emacs-28 compiled with native-comp or not.
>
> which gio returns /usr/bin/gio.
>
> Any ideas?

Tramp searches for the gio monitor on the remote host. Does it exist there?

> Thanks.

Best regards, Michael.

Message #11 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Tue, 27 Apr 2021 21:38:45 +0000

[Message part 1 (text/plain, inline)]

Hi Michael,

Michael Albinus <michael.albinus <at> gmx.de> writes:

> [[PGP Encrypted Part:OK]]
> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
> Hi Thierry,
>
>> When adding a file-notify watcher to a remote directory in helm-find-files, I
>> have an error "cannot determine gio monitor":
>>
>> Debugger entered--Lisp error: (file-error "Cannot determine gio monitor")
>>   signal(file-error ("Cannot determine gio monitor"))
>>   tramp-sh-gio-monitor-process-filter(#<process gio> "\n(gio monitor:15942): GLib-GIO-\33[1;33mWARNING\33[0m ...")
>>   [...]
>>
>> This doesn't happen in emacs-27.2.
>> It happens in emacs-28 compiled with native-comp or not.
>>
>> which gio returns /usr/bin/gio.
>>
>> Any ideas?
>
> Tramp searches for the gio monitor on the remote host. Does it exist there?

Yes, and anyway this happen as well with sudo method on same machine.

>> Thanks.
>
> Best regards, Michael.
>
>
> [[End of PGP Encrypted Part]]


-- 
Thierry

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

Message #14 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 05:59:29 +0000

[Message part 1 (text/plain, inline)]

Thierry Volpiatto <thievol <at> posteo.net> writes:

> Hi Michael,
>
> Michael Albinus <michael.albinus <at> gmx.de> writes:
>
>> [[PGP Encrypted Part:OK]]
>> Thierry Volpiatto <thievol <at> posteo.net> writes:
>>
>> Hi Thierry,
>>
>>> When adding a file-notify watcher to a remote directory in helm-find-files, I
>>> have an error "cannot determine gio monitor":
>>>
>>> Debugger entered--Lisp error: (file-error "Cannot determine gio monitor")
>>>   signal(file-error ("Cannot determine gio monitor"))
>>>   tramp-sh-gio-monitor-process-filter(#<process gio> "\n(gio monitor:15942): GLib-GIO-\33[1;33mWARNING\33[0m ...")
>>>   [...]
>>>
>>> This doesn't happen in emacs-27.2.
>>> It happens in emacs-28 compiled with native-comp or not.
>>>
>>> which gio returns /usr/bin/gio.
>>>
>>> Any ideas?
>>
>> Tramp searches for the gio monitor on the remote host. Does it exist there?
>
> Yes, and anyway this happen as well with sudo method on same machine.

More exactly, it seems gio command is correctly extracted in
`tramp-sh-handle-file-notify-add-watch` with
(tramp-get-remote-gio-monitor v) but later in the process filter
(tramp-connection-property-p proc "gio-file-monitor") returns nil.

Thanks.

>>> Thanks.
>>
>> Best regards, Michael.
>>
>>
>> [[End of PGP Encrypted Part]]


-- 
Thierry

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

Message #17 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 09:38:27 +0200

[Message part 1 (text/plain, inline)]

Thierry Volpiatto <thievol <at> posteo.net> writes:

>> Hi Michael,

Hi Thierry,

> More exactly, it seems gio command is correctly extracted in
> `tramp-sh-handle-file-notify-add-watch` with
> (tramp-get-remote-gio-monitor v) but later in the process filter
> (tramp-connection-property-p proc "gio-file-monitor") returns nil.

Does the appended patch fixes this?

> Thanks.

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #20 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 10:56:23 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
>>> Hi Michael,
>
> Hi Thierry,
>
>> More exactly, it seems gio command is correctly extracted in
>> `tramp-sh-handle-file-notify-add-watch` with
>> (tramp-get-remote-gio-monitor v) but later in the process filter
>> (tramp-connection-property-p proc "gio-file-monitor") returns nil.
>
> Does the appended patch fixes this?

Partially. No more error but the watcher have no effect like on
emacs-27.
helm-find-files is caching the directories it visits and for each
directory is adding a watcher, for example on emacs-27:

M-x helm-find-files => navigate to /sudo::/home/me/tmp/ directory:

foo.txt
bar.txt
baz.txt

Now from a shell:

touch ~/tmp/test.txt

M-x helm-find-files => navigate to /sudo::/home/me/tmp/ directory:

foo.txt
bar.txt
baz.txt
test.txt

test.txt is not added with emacs-28, that's mean the watcher didn't
notify helm to remove tmp directory from cache.

Thanks.

-- 
Thierry

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

Message #23 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 13:16:38 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

>> Does the appended patch fixes this?
>
> Partially. No more error but the watcher have no effect like on
> emacs-27.
> helm-find-files is caching the directories it visits and for each
> directory is adding a watcher, for example on emacs-27:
>
> M-x helm-find-files => navigate to /sudo::/home/me/tmp/ directory:
>
> foo.txt
> bar.txt
> baz.txt
>
> Now from a shell:
>
> touch ~/tmp/test.txt
>
> M-x helm-find-files => navigate to /sudo::/home/me/tmp/ directory:
>
> foo.txt
> bar.txt
> baz.txt
> test.txt
>
> test.txt is not added with emacs-28, that's mean the watcher didn't
> notify helm to remove tmp directory from cache.

I need Tramp traces with tramp-verbose set to 10. Please start a fresh
session via "emacs -Q".

You can send the traces direct to me, w/o debbugs.gnu.org in Cc, in
order not to trash the debbugs database and ML.

> Thanks.

Best regards, Michael.

Message #26 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 15:57:37 +0200

[Message part 1 (text/plain, inline)]

Thierry Volpiatto <thievol <at> posteo.net> writes:

> Hello Michael,

Hi Thierry,

> What I did: M-x helm-find-files => /sudo::/home/thierry/tmp/
> Looks the watchers are recorded with a warning though.

That's OK. The warning tells us that it is an older gio version, which
doesn't want to speak about its implementation details. Not a big deal,
Tramp handles this.

> Then I delete test.txt from external terminal.
> It seems the watcher catched the event but the notification is with the
> local name of directory instead of the remote name.
> I.e. /home/thierry/tmp/ instead of /sudo::/home/thierry/tmp/
> not sure if it is normal.

That's OK. gio doesn't know Tramp and its syntax :-)

> 14:39:28.298343 tramp-sh-gio-monitor-process-filter (6) # #<process gio>
>
> (gio monitor:27194): GLib-GIO-%1b[1;33mWARNING%1b[0m **:
> %1b[34m14:39:28.217%1b[0m: Can't find module 'help' specified in GIO_USE_FILE_MONITOR

And here's the problem. The warning includes escape sequences, which are
not known to tramp-sh-gio-monitor-process-filter. So I've reworked the
patch as attached, could you pls test?

> Thanks.

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #29 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 18:25:54 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

> If it can help here the relevant part of the tramp log from emacs-27:
>
> 17:01:06.548820 tramp-get-file-property (8) # /home/thierry/tmp file-exists-p t
> 17:01:09.974262 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p t
> 17:01:14.119915 tramp-sh-gio-monitor-process-filter (6) # #<process gio>
> /home/thierry/tmp: /home/thierry/tmp/test.txt: created
> /home/thierry/tmp: /home/thierry/tmp/test.txt: changes done
> /home/thierry/tmp: /home/thierry/tmp/test.txt: attributes changed

As you see, there're also local file names.

> 17:01:14.121499 tramp-accept-process-output (10) # gio 0 run nil
> 17:01:14.121681 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
> 17:01:14.121981 tramp-file-notify-process-sentinel (5) # Sentinel
> called: `#<process gio>' `processus arrêté
> '
> 17:01:14.122501 tramp-accept-process-output (10) # gio 0 signal nil
> 17:01:14.122652 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
> 17:01:14.122948 tramp-sh-gio-monitor-process-filter (10) # Rest string:
>
> 17:01:18.684045 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p undef
>
> As you can see the *rm-watch is called.

Yes. But we don't see why. And I also don't know how this is related to
your problem.

OK, a test. I use the handler from the elisp manual:

--8<---------------cut here---------------start------------->8---
(defun my-notify-callback (event)
  (message "Event %S" event))
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
1. Use Emacs 27

[albinus <at> gandalf ~]$ ~/src/emacs-27/src/emacs

M-: tramp-version
=> "2.4.5.27.2"

M-: (file-notify-add-watch "/ssh:freebsd12:/tmp" '(change attribute-change) 'my-notify-callback)
=> #<process gio>

albinus <at> freebsd12:~ % touch /tmp/test.txt
=> Event (#<process gio> created "/ssh:freebsd12:/tmp/test.txt")

albinus <at> freebsd12:~ % rm /tmp/test.txt
=> Event (#<process gio> deleted "/ssh:freebsd12:/tmp/test.txt")
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
2. Use Emacs 28

[albinus <at> gandalf ~]$ ~/src/emacs/src/emacs

M-: tramp-version
=> "2.5.1-pre"

M-: (file-notify-add-watch "/ssh:freebsd12:/tmp" '(change attribute-change) 'my-notify-callback)
=> #<process gio>

albinus <at> freebsd12:~ % touch /tmp/test.txt
=> Event (#<process gio> created "/ssh:freebsd12:/tmp/test.txt")

albinus <at> freebsd12:~ % rm /tmp/test.txt
=> Event (#<process gio> deleted "/ssh:freebsd12:/tmp/test.txt")
--8<---------------cut here---------------end--------------->8---

Exactly the same events.

> Thanks.

Best regards, Michael.

Message #32 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 19:39:04 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,
>>> 17:01:06.548820 tramp-get-file-property (8) # /home/thierry/tmp file-exists-p t
>>> 17:01:09.974262 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p t
>>> 17:01:14.119915 tramp-sh-gio-monitor-process-filter (6) # #<process gio>
>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: created
>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: changes done
>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: attributes changed
>>
>> As you see, there're also local file names.
>
> Yes, I saw this it is why I don't understand how it could work on 27 and
> not on 28.

What exactly does not work on Emacs 28? Events do not arrive? Events
have wrong values?

>>> 17:01:14.121499 tramp-accept-process-output (10) # gio 0 run nil
>>> 17:01:14.121681 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
>>> 17:01:14.121981 tramp-file-notify-process-sentinel (5) # Sentinel
>>> called: `#<process gio>' `processus arrêté
>>> '
>>> 17:01:14.122501 tramp-accept-process-output (10) # gio 0 signal nil
>>> 17:01:14.122652 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
>>> 17:01:14.122948 tramp-sh-gio-monitor-process-filter (10) # Rest string:
>>>
>>> 17:01:18.684045 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p undef
>>>
>>> As you can see the *rm-watch is called.
>>
>> Yes. But we don't see why.
>
> This is what I would like to know ;-)
>
>> And I also don't know how this is related to your problem.
>
> I am not sure it is related to my problem, I just suspect it is.

Maybe you can set file-notify-debug to t? You will see how events go
around.

>> OK, a test. I use the handler from the elisp manual:
>
> Yes, I already tried similar tests.

So I've lost you. What works, and what not?

> Anyway, perhaps you can push your changes? They are an improvement over
> what is actually in master.

Done.

Best regards, Michael.

Message #35 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 18:28:54 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> [[PGP Encrypted Part:OK]]
> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
> Hi Thierry,
>>>> 17:01:06.548820 tramp-get-file-property (8) # /home/thierry/tmp file-exists-p t
>>>> 17:01:09.974262 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p t
>>>> 17:01:14.119915 tramp-sh-gio-monitor-process-filter (6) # #<process gio>
>>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: created
>>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: changes done
>>>> /home/thierry/tmp: /home/thierry/tmp/test.txt: attributes changed
>>>
>>> As you see, there're also local file names.
>>
>> Yes, I saw this it is why I don't understand how it could work on 27 and
>> not on 28.
>
> What exactly does not work on Emacs 28?

helm-find-files cache is not updated when something change in a remote
directory.


> Events do not arrive?

Yes.

> Events have wrong values?


>>>> 17:01:14.121499 tramp-accept-process-output (10) # gio 0 run nil
>>>> 17:01:14.121681 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
>>>> 17:01:14.121981 tramp-file-notify-process-sentinel (5) # Sentinel
>>>> called: `#<process gio>' `processus arrêté
>>>> '
>>>> 17:01:14.122501 tramp-accept-process-output (10) # gio 0 signal nil
>>>> 17:01:14.122652 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio>
>>>> 17:01:14.122948 tramp-sh-gio-monitor-process-filter (10) # Rest string:
>>>>
>>>> 17:01:18.684045 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p undef
>>>>
>>>> As you can see the *rm-watch is called.
>>>
>>> Yes. But we don't see why.
>>
>> This is what I would like to know ;-)
>>
>>> And I also don't know how this is related to your problem.
>>
>> I am not sure it is related to my problem, I just suspect it is.
>
> Maybe you can set file-notify-debug to t? You will see how events go
> around.
>
>>> OK, a test. I use the handler from the elisp manual:
>>
>> Yes, I already tried similar tests.
>
> So I've lost you. What works, and what not?
>
>> Anyway, perhaps you can push your changes? They are an improvement over
>> what is actually in master.
>
> Done.
>
> Best regards, Michael.
>
>
> [[End of PGP Encrypted Part]]


-- 
Thierry

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

Message #38 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 18:47:07 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Maybe you can set file-notify-debug to t? You will see how events go
> around.

Thanks for this, it helps.

This happen on emacs-27:

;; file-notify-handle-event (file-notify (#<process gio<4>> (changes-done-hint) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
;; file-notify-handle-event (file-notify (#<process gio<4>> (attribute-changed) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)

On emacs-28 nothing happen when modifying externally same directory
(tmp).


-- 
Thierry

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

Message #41 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Wed, 28 Apr 2021 20:56:27 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

> This happen on emacs-27:
>
> ;; file-notify-handle-event (file-notify (#<process gio<4>> (changes-done-hint) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
> ;; file-notify-handle-event (file-notify (#<process gio<4>> (attribute-changed) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
>
> On emacs-28 nothing happen when modifying externally same directory
> (tmp).

Strange. Have you tried "M-x tramp-cleanup-all-connections"? Prior to
connecting the remote machine.

Otherwise, I have no idea (it works for me as I have shown). Is there a
chance I could debug, connecting your remote machine?

Otherwise, I would need to write special instrumentations in
tramp-sh-gio-monitor-process-filter just for you.

Best regards, Michael.

Message #44 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 05:33:08 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> [[PGP Encrypted Part:OK]]
> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
>> This happen on emacs-27:
>>
>> ;; file-notify-handle-event (file-notify (#<process gio<4>> (changes-done-hint) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
>> ;; file-notify-handle-event (file-notify (#<process gio<4>> (attribute-changed) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
>>
>> On emacs-28 nothing happen when modifying externally same directory
>> (tmp).
>
> Strange. Have you tried "M-x tramp-cleanup-all-connections"? Prior to
> connecting the remote machine.

I always start a new emacs session for debugging.

> Otherwise, I have no idea (it works for me as I have shown).

No, it is not the same example, please bear with me, try with same
conditions and with tramp-debug and file-notify-debug set:

1) Install helm

2) open a terminal outside emacs

3) run in emacs helm-find-files and navigate to /sudo::/home/you/tmp/

4) go to the terminal opened in 2) and touch ~/tmp/test.txt

5) go back to emacs and see nothing happened

Now do the same from emacs-27 and see in 5) that an *rm-watch happened.

Here the relevant logs for emacs-28 and emacs-27:

;; Emacs 28
001 07:12:50.967691 tramp-sh-gio-monitor-process-filter (6) # #<process gio<4>>
002 (gio monitor:29342): GLib-GIO-1;33mWARNING0m **: 34m07:12:50.946[0m: Can't find module 'help' specified in GIO_USE_FILE_MONITOR
003 07:12:50.967794 tramp-get-connection-property (7) # gio-file-monitor undef; cache used: nil
004 07:12:50.967879 tramp-set-connection-property (7) # gio-file-monitor undef
005 07:12:54.974248 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p t; inhibit: 10; cache used: t; cached at: 07:12:50
006 07:13:00.401319 tramp-sh-gio-monitor-process-filter (6) # #<process gio<4>>
007 /home/thierry/tmp: /home/thierry/tmp/test.txt: created
008 /home/thierry/tmp: /home/thierry/tmp/test.txt: changes done
009 /home/thierry/tmp: /home/thierry/tmp/test.txt: attributes changed
010 07:13:00.401503 tramp-get-connection-property (7) # gio-file-monitor undef; cache used: nil
011 07:13:00.401656 tramp-sh-gio-monitor-process-filter (10) # Rest string:
012 /home/thierry/tmp: /home/thierry/tmp/test.txt: created
013 /home/thierry/tmp: /home/thierry/tmp/test.txt: changes-done-hint
014 /home/thierry/tmp: /home/thierry/tmp/test.txt: attribute-changed
015 07:13:10.485947 tramp-get-file-property (8) # /home/thierry/tmp file-directory-p undef; inhibit: 10; cache used: nil; cached at: 07:12:50


;; Emacs 27
001 07:21:11.964043 tramp-sh-gio-monitor-process-filter (6) # #<process gio<4>>
002 /home/thierry/tmp: /home/thierry/tmp/test.txt: created
003 /home/thierry/tmp: /home/thierry/tmp/test.txt: changes done
004 /home/thierry/tmp: /home/thierry/tmp/test.txt: attributes changed
005 07:21:11.980001 tramp-accept-process-output (10) # gio<4> 0 run nil
006 07:21:11.980151 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio<4>>
007 07:21:11.980343 tramp-file-notify-process-sentinel (5) # Sentinel called: `#<process gio<4>>' `processus arrêté'
008 07:21:11.980657 tramp-accept-process-output (10) # gio<4> 0 signal nil
009 07:21:11.980747 tramp-handle-file-notify-rm-watch (6) # Kill #<process gio<4>>
010 07:21:11.988139 tramp-sh-gio-monitor-process-filter (10) # Rest string:

You can see that in line 009 in emacs-27 log an *rm-watch happen whereas
in emacs28 it doesn't happen.

> Is there a chance I could debug, connecting your remote machine?

Yes sure, I have just to create an account with an installed emacs28 for
you, but please try first on your side with same recipe.

> Otherwise, I would need to write special instrumentations in
> tramp-sh-gio-monitor-process-filter just for you.
>
> Best regards, Michael.
>
>
> [[End of PGP Encrypted Part]]


-- 
Thierry

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

Message #47 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 06:09:48 +0000

[Message part 1 (text/plain, inline)]

Update:

After commenting a block of code in
`tramp-sh-gio-monitor-process-filter` it is now working properly, events
are created, here the diff:

diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 4a3072ee346..3f5ec76864b 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -3732,23 +3732,24 @@ Fall back to normal file name handler if no Tramp handler exists."
       (unless (tramp-connection-property-p proc "gio-file-monitor")
         (tramp-set-connection-property
          proc "gio-file-monitor"
-         (cond
-          ;; We have seen this on cygwin gio and on emba.  Let's make
-          ;; some assumptions.
-          ((string-match
-            "Can't find module 'help' specified in GIO_USE_FILE_MONITOR" string)
-           (cond
-            ((getenv "EMACS_EMBA_CI") 'GInotifyFileMonitor)
-            ((eq system-type 'cygwin) 'GPollFileMonitor)
-            (t tramp-cache-undefined)))
-          ;; TODO: What happens, if several monitor names are reported?
-          ((string-match "\
-Supported arguments for GIO_USE_FILE_MONITOR environment variable:
-\\s-*\\([[:alpha:]]+\\) - 20" string)
-           (intern
-	    (format "G%sFileMonitor" (capitalize (match-string 1 string)))))
-          (t (throw 'doesnt-work nil))))
-	(setq string (substring string (match-end 0))))
+         tramp-cache-undefined))
+;;          (cond
+;;           ;; We have seen this on cygwin gio and on emba.  Let's make
+;;           ;; some assumptions.
+;;           ((string-match
+;;             "Can't find module 'help' specified in GIO_USE_FILE_MONITOR" string)
+;;            (cond
+;;             ((getenv "EMACS_EMBA_CI") 'GInotifyFileMonitor)
+;;             ((eq system-type 'cygwin) 'GPollFileMonitor)
+;;             (t tramp-cache-undefined)))
+;;           ;; TODO: What happens, if several monitor names are reported?
+;;           ((string-match "\
+;; Supported arguments for GIO_USE_FILE_MONITOR environment variable:
+;; \\s-*\\([[:alpha:]]+\\) - 20" string)
+;;            (intern
+;; 	    (format "G%sFileMonitor" (capitalize (match-string 1 string)))))
+;;           (t (throw 'doesnt-work nil))))
+;; 	(setq string (substring string (match-end 0))))
 
       ;; Delete empty lines.
       (setq string (tramp-compat-string-replace "\n\n" "\n" string)

Michael Albinus <michael.albinus <at> gmx.de> writes:

> [[PGP Encrypted Part:OK]]
> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
>> This happen on emacs-27:
>>
>> ;; file-notify-handle-event (file-notify (#<process gio<4>> (changes-done-hint) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
>> ;; file-notify-handle-event (file-notify (#<process gio<4>> (attribute-changed) "/sudo:root <at> IPadS340:/home/thierry/tmp/test.txt" nil) file-notify-callback)
>>
>> On emacs-28 nothing happen when modifying externally same directory
>> (tmp).
>
> Strange. Have you tried "M-x tramp-cleanup-all-connections"? Prior to
> connecting the remote machine.
>
> Otherwise, I have no idea (it works for me as I have shown). Is there a
> chance I could debug, connecting your remote machine?
>
> Otherwise, I would need to write special instrumentations in
> tramp-sh-gio-monitor-process-filter just for you.
>
> Best regards, Michael.
>
>
> [[End of PGP Encrypted Part]]


-- 
Thierry

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

Message #50 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 06:46:45 +0000

[Message part 1 (text/plain, inline)]

Update2:
More exactly the error occur when setting 'string':

diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index 4a3072ee346..8885bd55846 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -3748,7 +3748,8 @@ Supported arguments for GIO_USE_FILE_MONITOR environment variable:
            (intern
 	    (format "G%sFileMonitor" (capitalize (match-string 1 string)))))
           (t (throw 'doesnt-work nil))))
-	(setq string (substring string (match-end 0))))
+	;(setq string (substring string (match-end 0)))
+        )
 
       ;; Delete empty lines.
       (setq string (tramp-compat-string-replace "\n\n" "\n" string)

With this commented line events occur as expected.

-- 
Thierry

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

Message #53 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 09:17:50 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

>> Is there a chance I could debug, connecting your remote machine?
>
> Yes sure, I have just to create an account with an installed emacs28 for
> you, but please try first on your side with same recipe.

Thanks. In case we go this way, you don't need to install a local
Emacs. It would be sufficient for me to have ssh access to a restricted
account on that machine.

For the time being I will see, whether your other messages give me
enough input to improve. Thanks for their analysis anyway!

Best regards, Michael.

Message #56 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 07:48:01 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
> Hi Thierry,
>
>>> Is there a chance I could debug, connecting your remote machine?
>>
>> Yes sure, I have just to create an account with an installed emacs28 for
>> you, but please try first on your side with same recipe.
>
> Thanks. In case we go this way, you don't need to install a local
> Emacs.

Ok, if needed you will be able to run helm from system install with just
helm -nw from command line without the need of installing anything else.

> It would be sufficient for me to have ssh access to a restricted
> account on that machine.

Ok, let me know when you need it, I will send you an encrypted message
privately with instructions to connect.

> For the time being I will see, whether your other messages give me
> enough input to improve. Thanks for their analysis anyway!

Thanks!

-- 
Thierry

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

Message #59 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 10:11:50 +0200

[Message part 1 (text/plain, inline)]

Thierry Volpiatto <thievol <at> posteo.net> writes:

> Update2:
> More exactly the error occur when setting 'string':
>
> diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
> index 4a3072ee346..8885bd55846 100644
> --- a/lisp/net/tramp-sh.el
> +++ b/lisp/net/tramp-sh.el
> @@ -3748,7 +3748,8 @@ Supported arguments for GIO_USE_FILE_MONITOR environment variable:
>             (intern
>  	    (format "G%sFileMonitor" (capitalize (match-string 1 string)))))
>            (t (throw 'doesnt-work nil))))
> -	(setq string (substring string (match-end 0))))
> +	;(setq string (substring string (match-end 0)))
> +        )
>
>        ;; Delete empty lines.
>        (setq string (tramp-compat-string-replace "\n\n" "\n" string)
>
> With this commented line events occur as expected.

So the problem is the match-end call. Here's a patch which might fix
this. In case it doesn't work, pls give me ssh access to your machine. I
would send you my public ssh key for access.

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #62 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 08:42:57 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
>> Update2:
>> More exactly the error occur when setting 'string':
>>
>> diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
>> index 4a3072ee346..8885bd55846 100644
>> --- a/lisp/net/tramp-sh.el
>> +++ b/lisp/net/tramp-sh.el
>> @@ -3748,7 +3748,8 @@ Supported arguments for GIO_USE_FILE_MONITOR environment variable:
>>             (intern
>>  	    (format "G%sFileMonitor" (capitalize (match-string 1 string)))))
>>            (t (throw 'doesnt-work nil))))
>> -	(setq string (substring string (match-end 0))))
>> +	;(setq string (substring string (match-end 0)))
>> +        )
>>
>>        ;; Delete empty lines.
>>        (setq string (tramp-compat-string-replace "\n\n" "\n" string)
>>
>> With this commented line events occur as expected.
>
> So the problem is the match-end call. Here's a patch which might fix
> this.

No, it doesn't fix it, as long as string is set with 
(setq string (substring string (match-end 0))) it doesn't work,
*rm-watch is never called.

> In case it doesn't work, pls give me ssh access to your machine.

Ok will prepare it.

> I would send you my public ssh key for access.

No thanks, PAM login will be enabled.

-- 
Thierry

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

Message #65 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 12:55:25 +0200

[Message part 1 (text/plain, inline)]

Hi Thierry,

> It works, and I can reproduce the problem. Now debugging.

With the appended patch, it works for me on your machine. Could you pls check?

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #68 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 11:26:47 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Hi Thierry,
>
>> It works, and I can reproduce the problem. Now debugging.
>
> With the appended patch, it works for me on your machine. Could you pls check?

I confirm it works, great! Thanks!

-- 
Thierry

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Message #71 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 11:30:02 +0000

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Thierry Volpiatto <thievol <at> posteo.net> writes:

> Michael Albinus <michael.albinus <at> gmx.de> writes:
>
>> Hi Thierry,
>>
>>> It works, and I can reproduce the problem. Now debugging.
>>
>> With the appended patch, it works for me on your machine. Could you pls check?
>
> I confirm it works, great! Thanks!

While we are at it perhaps you can use ansi-color-apply in tramp log
unless it cause performance problems (seems it doesn't)?

-- 
Thierry

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Message #76 received at 48067-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067-done <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 15:07:26 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

>>> It works, and I can reproduce the problem. Now debugging.
>>
>> With the appended patch, it works for me on your machine. Could you pls check?
>
> I confirm it works, great! Thanks!

Thanks for the feedback, and for your kind hosting of my tests.

I've pushed to latest changes to master, slightly modified. Closing the bug.

Best regards, Michael.

Message #79 received at 48067 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Thierry Volpiatto <thievol <at> posteo.net>
Cc: 48067 <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 15:09:52 +0200

Thierry Volpiatto <thievol <at> posteo.net> writes:

Hi Thierry,

> While we are at it perhaps you can use ansi-color-apply in tramp log
> unless it cause performance problems (seems it doesn't)?

No, that's not to idea of Tramp's debug buffer. It is important to see
every single char, also ANSI escape sequences, for debugging. Often, the
problems are hidden there.

Best regards, Michael.

Message #82 received at 48067-done <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thievol <at> posteo.net>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 48067-done <at> debbugs.gnu.org
Subject: Re: bug#48067: 28.0.50; Tramp error: cannot determine gio monitor
Date: Thu, 29 Apr 2021 13:20:37 +0000

[Message part 1 (text/plain, inline)]

Michael Albinus <michael.albinus <at> gmx.de> writes:

> Thierry Volpiatto <thievol <at> posteo.net> writes:
>
> Hi Thierry,
>
>>>> It works, and I can reproduce the problem. Now debugging.
>>>
>>> With the appended patch, it works for me on your machine. Could you pls check?
>>
>> I confirm it works, great! Thanks!
>
> Thanks for the feedback, and for your kind hosting of my tests.
>
> I've pushed to latest changes to master, slightly modified. Closing the bug.

Great! Thanks.

-- 
Thierry

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