GNU bug report logs - #17148
Revert buffer menu-item and file permission changes

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Package: emacs; Severity: minor; Reported by: Joe Camaioni <jcamaion@HIDDEN>; dated Mon, 31 Mar 2014 15:45:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Stefan Monnier <monnier@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
Message-ID: <jwvd2gzopcd.fsf-monnier+emacsbugs@HIDDEN>
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
 <jwvd2h0u7wu.fsf-monnier+emacsbugs@HIDDEN>
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Date: Wed, 02 Apr 2014 09:04:16 -0400
In-Reply-To: <p1k3b8b565.fsf@HIDDEN> (Glenn Morris's message of
 "Wed, 02 Apr 2014 02:45:38 -0400")
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> Personally I would not mind seeing a non-greyed-out menu-item for Revert
> Buffer in such a case. I have modified the buffer ('s meta-data)
> compared to how it is on disk, so I might want to revert it.

I can agree, but only if revert-buffer indeed changes buffer-read-only.


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
Message-ID: <jwvioqropeg.fsf-monnier+emacsbugs@HIDDEN>
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
 <87lhvpncyb.fsf@HIDDEN> <i1a9c4oqb9.fsf@HIDDEN>
 <87d2h0evv2.fsf@HIDDEN> <0p1txg6fia.fsf@HIDDEN>
Date: Wed, 02 Apr 2014 09:03:14 -0400
In-Reply-To: <0p1txg6fia.fsf@HIDDEN> (Glenn Morris's message of
 "Tue, 01 Apr 2014 15:01:17 -0400")
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>>> So the result is basically now that the "Revert Buffer" menu item is
>>> always enabled, which may not be precisely what the OP wanted.
>> Yes. Maybe Stefan could explain the reasoning behind.
> I'm going to guess it is an unintended consequence of changing the
> default value of revert-buffer-function (and
> revert-buffer-insert-file-contents-function) to be non-nil (which was
> probably for the purpose of advice).

Right.

> This change has no NEWS entry and no documentation updates.

It seemed "internal" enough.  But I guess I was wrong.


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.
Removed tag(s) notabug. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Changed bug title to 'Revert buffer menu-item and file permission changes' from '23.1; Revert Buffer' Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.

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From: Glenn Morris <rgm@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
 <jwvd2h0u7wu.fsf-monnier+emacsbugs@HIDDEN>
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Stefan Monnier wrote:

> Because revert-buffer is meant to handle the file's content, not its
> read-only setting.

File permission bits can be viewed as just another form of content.

> E.g. maybe the buffer is read-only because the user hit C-x C-q.

Personally I would not mind seeing a non-greyed-out menu-item for Revert
Buffer in such a case. I have modified the buffer ('s meta-data)
compared to how it is on disk, so I might want to revert it.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
Message-ID: <jwvd2h0u7wu.fsf-monnier+emacsbugs@HIDDEN>
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
Date: Tue, 01 Apr 2014 16:14:04 -0400
In-Reply-To: <gk38hx59lr.fsf@HIDDEN> (Glenn Morris's message of
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>> Emacs is not notified, when a file changes its state outside Emacs. Only
>> prior to writing to a file Emacs checks, whether a file has changed on disk.
> Why can't the revert-buffer menu-item check the file mode bits match,
> the same way it verifies the modtime? IMO it should just call
> file-attributes once, and use that to check time and permissions.

Because revert-buffer is meant to handle the file's content, not its
read-only setting.
E.g. maybe the buffer is read-only because the user hit C-x C-q.

Maybe we should use a 3rd setting for buffer-read-only which says "obey
the file's writability".


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Glenn Morris <rgm@HIDDEN>
To: Michael Albinus <michael.albinus@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
 <87lhvpncyb.fsf@HIDDEN> <i1a9c4oqb9.fsf@HIDDEN>
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Michael Albinus wrote:

>> So the result is basically now that the "Revert Buffer" menu item is
>> always enabled, which may not be precisely what the OP wanted.
>
> Yes. Maybe Stefan could explain the reasoning behind.

I'm going to guess it is an unintended consequence of changing the
default value of revert-buffer-function (and
revert-buffer-insert-file-contents-function) to be non-nil (which was
probably for the purpose of advice).

This change has no NEWS entry and no documentation updates.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Michael Albinus <michael.albinus@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
 <87lhvpncyb.fsf@HIDDEN> <i1a9c4oqb9.fsf@HIDDEN>
Date: Tue, 01 Apr 2014 20:40:49 +0200
In-Reply-To: <i1a9c4oqb9.fsf@HIDDEN> (Glenn Morris's message of
 "Tue, 01 Apr 2014 14:30:34 -0400")
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Glenn Morris <rgm@HIDDEN> writes:

>> However, surprisingly this problem is reproducible in Emacs 23, but it
>> is NOT reproducible with Emacs 24.3.50. This is because
>> `revert-buffer-function' is set to `revert-buffer--default' since last
>> year.
>
> So the result is basically now that the "Revert Buffer" menu item is
> always enabled, which may not be precisely what the OP wanted.

Yes. Maybe Stefan could explain the reasoning behind.

Best regards, Michael.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Glenn Morris <rgm@HIDDEN>
To: Michael Albinus <michael.albinus@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
References: <201403311333.s2VDXNuJ029811@HIDDEN>
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Michael Albinus wrote:

> However, surprisingly this problem is reproducible in Emacs 23, but it
> is NOT reproducible with Emacs 24.3.50. This is because
> `revert-buffer-function' is set to `revert-buffer--default' since last
> year.

So the result is basically now that the "Revert Buffer" menu item is
always enabled, which may not be precisely what the OP wanted.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Michael Albinus <michael.albinus@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#17148: 23.1; Revert Buffer
References: <201403311333.s2VDXNuJ029811@HIDDEN>
 <87ppl1v893.fsf@HIDDEN> <gk38hx59lr.fsf@HIDDEN>
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tags 17148 - notabug
fixed 17148 24.4
thanks

Glenn Morris <rgm@HIDDEN> writes:

> Michael Albinus wrote:
>
>> Emacs is not notified, when a file changes its state outside Emacs. Only
>> prior to writing to a file Emacs checks, whether a file has changed on disk.
>
> Why can't the revert-buffer menu-item check the file mode bits match,
> the same way it verifies the modtime? IMO it should just call
> file-attributes once, and use that to check time and permissions.

Hmm, I wanted to implement something with file notifications.

However, surprisingly this problem is reproducible in Emacs 23, but it
is NOT reproducible with Emacs 24.3.50. This is because
`revert-buffer-function' is set to `revert-buffer--default' since last
year.

My analysis was wrong, but the result (not a bug) is somehow right for
Emacs 24.3. We shall changed that to "Fixed in 24.4", 'tho.

Best regards, Michael.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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Subject: Re: bug#17148: 23.1; Revert Buffer
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Michael Albinus wrote:

> Emacs is not notified, when a file changes its state outside Emacs. Only
> prior to writing to a file Emacs checks, whether a file has changed on disk.

Why can't the revert-buffer menu-item check the file mode bits match,
the same way it verifies the modtime? IMO it should just call
file-attributes once, and use that to check time and permissions.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.
bug closed, send any further explanations to 17148 <at> debbugs.gnu.org and Joe Camaioni <jcamaion@HIDDEN> Request was from Michael Albinus <michael.albinus@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) notabug. Request was from Michael Albinus <michael.albinus@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 17148 <at> debbugs.gnu.org:


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From: Michael Albinus <michael.albinus@HIDDEN>
To: 17148 <at> debbugs.gnu.org
Subject: Re: bug#17148: 23.1; Revert Buffer
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Joe Camaioni <jcamaion@HIDDEN> writes:

> A buffer has been loaded with a file.  It is initially unwritable.  A chmod is performed in a shell window to make it writable.  Going into the File menu pulldown, the Revert Buffer stays gray-ed out, and the file is still listed as unwritable.

Emacs is not notified, when a file changes its state outside Emacs. Only
prior to writing to a file Emacs checks, whether a file has changed on disk.

The upcoming Emacs 24.4 has implemented file notifications on systems
which support it (mainly GNU/Linux and MS Windows). This could be used
for this kind of checks.

For Emacs 23, I don't regard this as a bug.

Best regards, Michael.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.

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A buffer has been loaded with a file.  It is initially unwritable.  A chmod is performed in a shell window to make it writable.  Going into the File menu pulldown, the Revert Buffer stays gray-ed out, and the file is still listed as unwritable.  


In GNU Emacs 23.1.1 (x86_64-redhat-linux-gnu, GTK+ Version 2.18.9)
 of 2011-02-01 on x86-003.build.bos.redhat.com
Windowing system distributor `The X.Org Foundation', version 11.0.60900000
configured using `configure  '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xft' '--with-xpm' '--with-x-toolkit=gtk' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso88591
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default-enable-multibyte-characters: t

Major mode: Tcl

Minor modes in effect:
  text-scale-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
nd-emacs-bug-report>

Recent messages:
Cannot write backup file; backing up in /home/jcamaion/%backup%~
Wrote /home/vobadm/bin/AR_QA_pkg.exp
Saving file /home/vobadm/bin/AR_QA_pkg.exp...
Wrote /home/vobadm/bin/AR_QA_pkg.exp
Note: file is write protected
Mark saved where search started
Note: file is write protected
Buffer is read-only: #<buffer AP_QA_tar.exp>
Mark saved where search started
call-interactively: Text is read-only
Acknowledgement sent to Joe Camaioni <jcamaion@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#17148; Package emacs. Full text available.
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Last modified: Fri, 31 Oct 2014 17:00:04 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.