GNU bug report logs - #9765
24.0.90; Multiple calls to desktop-read cause problems

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

From: Ryan Thompson <rct <at> thompsonclan.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.90; Multiple calls to desktop-read cause problems
Date: Sun, 16 Oct 2011 03:47:31 -0700

If a desktop has already been loaded and "desktop-read" is called a
second time, it will set "desktop-dirname" to nil, which can cause
problems when trying to save the desktop later. The "desktop-read"
function checks whether a desktop file is owned before loading it, and
if the file is owned, it refuses to "steal" the file (assuming
appropriate options are set) and sets "desktop-dirname" to nil to
indicate that it does not own the file. This behavior occurs even when
the owner of the desktop file is the Emacs process itself. Thus, calling
"desktop-read" once loads the desktop file, and calling "desktop-read" a
second time effectively abandons it. This behavior can be fixed with the
following advice, which turns "desktop-read" into a no-op when the
current Emacs process is already the desktop owner.

(defadvice desktop-read (around avoid-redundant-read activate)
  "Don't abandon an already-loaded desktop"
  (if (and (desktop-owner) (= (desktop-owner) (emacs-pid)))
      (message "Desktop file already loaded. Skipping reload.")
    ad-do-it))

I'm not sure if this is an appropriate fix, but I think this is the
correct behavior.


In GNU Emacs 24.0.90.1 (x86_64-pc-linux-gnu, GTK+ Version 3.2.0)
 of 2011-10-16 on aeolus, modified by Debian
 (emacs-snapshot package, version 1:20111012-1+ubuntu1.1)
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
configured using `configure  '--build' 'x86_64-linux-gnu' '--host'
'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib'
'--libexecdir=/usr/lib' '--localstatedir=/var'
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.0.90/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.0.90/site-lisp:/usr/share/emacs/site-lisp'
'--without-compress-info' '--with-crt-dir=/usr/lib/x86_64-linux-gnu/'
'--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu'
'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g
-Wl,--as-needed' 'CPPFLAGS=''

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.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  eldoc-mode: t
  winpoint-mode: t
  volatile-highlights-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  diff-auto-refine-mode: t
  ido-ubiquitous: t
  global-highlight-parentheses-mode: t
  git-wip-mode: t
  nxhtml-menu-mode: t
  nxhtml-tag-do-also: t
  popcmp-group-alternatives: t
  popcmp-short-help-beside-alts: t
  mlinks-active-links: t
  sml-modeline-mode: t
  highlight-parentheses-mode: t
  autopair-mode: t
  autopair-global-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  show-paren-mode: t
  recentf-mode: t
  minibuffer-depth-indicate-mode: t
  ido-everywhere: t
  desktop-save-mode: t
  cua-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x C-b C-x b C-g <C-end> <up> <up> <return> C-r l
a z C-g C-g C-g <prior> <next> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> C-x C-b <down> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
d d d d d d d d d x y <up> <return> <C-end> M-x e m
a c d <backspace> s - r e p o C-g M-x r e p o r t
<return>

Recent messages:
Quit
Mark set
Quit [2 times]
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help
Really kill 9 buffers? (y or n)  y
Operation finished; killed 9 buffers
Mark set
Quit
Killed inactive buffer: *Ibuffer*.

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Message #8 received at 9765 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Ryan Thompson <rct <at> thompsonclan.org>
Cc: 9765 <at> debbugs.gnu.org
Subject: Re: bug#9765: 24.0.90; Multiple calls to desktop-read cause problems
Date: Mon, 07 Dec 2020 18:54:26 +0100

Ryan Thompson <rct <at> thompsonclan.org> writes:

> If a desktop has already been loaded and "desktop-read" is called a
> second time, it will set "desktop-dirname" to nil, which can cause
> problems when trying to save the desktop later. The "desktop-read"
> function checks whether a desktop file is owned before loading it, and
> if the file is owned, it refuses to "steal" the file (assuming
> appropriate options are set) and sets "desktop-dirname" to nil to
> indicate that it does not own the file. This behavior occurs even when
> the owner of the desktop file is the Emacs process itself. Thus, calling
> "desktop-read" once loads the desktop file, and calling "desktop-read" a
> second time effectively abandons it. This behavior can be fixed with the
> following advice, which turns "desktop-read" into a no-op when the
> current Emacs process is already the desktop owner.
>
> (defadvice desktop-read (around avoid-redundant-read activate)
>   "Don't abandon an already-loaded desktop"
>   (if (and (desktop-owner) (= (desktop-owner) (emacs-pid)))
>       (message "Desktop file already loaded. Skipping reload.")
>     ad-do-it))
>
> I'm not sure if this is an appropriate fix, but I think this is the
> correct behavior.

I've now done something similar to what you suggest in Emacs 28.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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