GNU bug report logs - #50010
28.0.50; ERC is too presumptuous with announced server names

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Package: emacs; Reported by: "J.P." <jp@HIDDEN>; Keywords: patch; dated Wed, 11 Aug 2021 14:29:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#50010: 28.0.50;
 ERC is too presumptuous with announced server names
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"J.P." <jp@HIDDEN> writes:

> Tags: patch
>
> Hi, this may seem innocuous, but it's relevant to the more offensive
> "omnibugs" I'm currently peddling [1]. Please see the commit log for
> details. As usual, I'm happy to answer any questions and/or provide
> specific examples. Thanks.
>
>
> [1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48598
>     https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49860

Copying in the ERC maintainer Amin Bandali here.

Amin, could you help review this patch?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#50010; Package emacs. Full text available.

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From: "J.P." <jp@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 28.0.50; ERC is too presumptuous with announced server names
Date: Wed, 11 Aug 2021 07:27:52 -0700
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--=-=-=
Content-Type: text/plain

Tags: patch

Hi, this may seem innocuous, but it's relevant to the more offensive
"omnibugs" I'm currently peddling [1]. Please see the commit log for
details. As usual, I'm happy to answer any questions and/or provide
specific examples. Thanks.


[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=48598
    https://debbugs.gnu.org/cgi/bugreport.cgi?bug=49860


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.17.4)
 of 2021-08-09 built on localhost
Repository revision: aeec97fae0ccfcc4dc406a5e0e4c0a94b834cac4
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Fedora 34 (Workstation Edition)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-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
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
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window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 51538 6355)
 (symbols 48 6607 1)
 (strings 32 18255 1368)
 (string-bytes 1 616656)
 (vectors 16 14292)
 (vector-slots 8 185252 10153)
 (floats 8 21 47)
 (intervals 56 205 0)
 (buffers 992 10))

--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Don-t-set-erc-server-announced-name-unless-known.patch

From f66f7b51ed099f911aefb26294c7b1524e973e37 Mon Sep 17 00:00:00 2001
From: "F. Jason Park" <jp@HIDDEN>
Date: Mon, 14 Jun 2021 23:40:45 -0700
Subject: [PATCH] Don't set erc-server-announced-name unless known

* lisp/erc/erc.el (erc-open): this function is called by the
entry-point functions/commands `erc' and `erc-tls', as well as by
query commands and join hooks to prepare a new/reused target buffer
for an existing server process. In the case of the former, the
variable erc-server-announced-name may be set in the current buffer
when an entry point command is invoked. If that buffer is another
server buffer in which the variable is already set, it's copied to the
new server buffer when the dialed servers match.  But there's no
guarantee that the announced name will match when actually announced
during an introductory burst. This also causes confusion in protocol
logs and may make it more difficult to reproduce bugs. Setting it to
nil helps ensure a consistent environment when setting up a buffer for
all newly dialed server connections.
---
 lisp/erc/erc.el | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/lisp/erc/erc.el b/lisp/erc/erc.el
index 73202016ba..fe57bc1998 100644
--- a/lisp/erc/erc.el
+++ b/lisp/erc/erc.el
@@ -1991,11 +1991,7 @@ erc-open
 private key and the certificate.
 
 Returns the buffer for the given server or channel."
-  (let ((server-announced-name (when (and (boundp 'erc-session-server)
-                                          (string= server erc-session-server))
-                                 erc-server-announced-name))
-        (connected-p (unless connect erc-server-connected))
-        (buffer (erc-get-buffer-create server port channel))
+  (let ((buffer (erc-get-buffer-create server port channel))
         (old-buffer (current-buffer))
         old-point
         continued-session)
@@ -2006,8 +2002,11 @@ erc-open
     (let ((old-recon-count erc-server-reconnect-count))
       (erc-mode)
       (setq erc-server-reconnect-count old-recon-count))
-    (setq erc-server-announced-name server-announced-name)
-    (setq erc-server-connected connected-p)
+    (unless connect
+      (setq erc-server-announced-name (with-current-buffer old-buffer
+                                        erc-server-announced-name))
+      (setq erc-server-connected (with-current-buffer old-buffer
+                                   erc-server-connected)))
     ;; connection parameters
     (setq erc-server-process process)
     (setq erc-insert-marker (make-marker))
-- 
2.31.1


--=-=-=--




Acknowledgement sent to "J.P." <jp@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#50010; Package emacs. Full text available.
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