GNU bug report logs - #13110
24.1; Problem chaining archive-mode and tar-mode.

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

From: Mihir <mihir.cs.iitd <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1; Problem chaining archive-mode and tar-mode.
Date: Fri, 07 Dec 2012 07:15:42 +0530

I was editing a debian binary package (.deb). Finding the file opens it
in archive-mode, then finding the file 'data.tar.gz' opens it in
tar-mode. I proceeded to edit the file, which produced a warning message
reminding me to go and save the buffer for 'data.tar.gz'. However, when
I attempted to save the buffer for 'data.tar.gz', I got an error message
saying, "Symbol's value as variable is void: archive-ar-write-file-member".

I think this is because of a conflict between the hooks added to
'write-file-functions' by archive-mode and tar-mode. I notice this is
handled in archive-mode by this line in arc-mode.el:

(remove-hook 'write-contents-functions 'archive-write-file t))

which suggests that a similar fix might help in this case.

I am aware that it is better practice to simply regenerate the .deb
file, but this is a bug in Emacs nonetheless.



In GNU Emacs 24.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-10-31 on ubuntu, modified by Debian
Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-Wall -O2'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro -g -g'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

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

Major mode: Lisp Interaction

Minor modes in effect:
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  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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC [ > 1 ; 3 2 0 1 ; 0 c

Recent messages:
("emacs" "-f" "report-emacs-bug")
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
/etc/emacs/xcscope hides /usr/share/emacs/24.1/site-lisp/cscope/xcscope
/usr/share/emacs/24.1/site-lisp/cmake-data/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode
/etc/emacs/xcscope hides /usr/share/emacs/site-lisp/xcscope
/usr/share/emacs/24.1/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
/usr/share/emacs/24.1/site-lisp/flim/hex-util hides /usr/share/emacs/24.1/lisp/hex-util
/usr/share/emacs/24.1/site-lisp/flim/md4 hides /usr/share/emacs/24.1/lisp/md4
/usr/share/emacs/site-lisp/rst hides /usr/share/emacs/24.1/lisp/textmodes/rst
/usr/share/emacs/24.1/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/24.1/lisp/textmodes/ispell
/usr/share/emacs/24.1/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/24.1/lisp/textmodes/flyspell
/usr/share/emacs/24.1/site-lisp/flim/ntlm hides /usr/share/emacs/24.1/lisp/net/ntlm
/usr/share/emacs/24.1/site-lisp/flim/hmac-md5 hides /usr/share/emacs/24.1/lisp/net/hmac-md5
/usr/share/emacs/24.1/site-lisp/flim/sasl-ntlm hides /usr/share/emacs/24.1/lisp/net/sasl-ntlm
/usr/share/emacs/24.1/site-lisp/flim/sasl-cram hides /usr/share/emacs/24.1/lisp/net/sasl-cram
/usr/share/emacs/24.1/site-lisp/flim/hmac-def hides /usr/share/emacs/24.1/lisp/net/hmac-def
/usr/share/emacs/24.1/site-lisp/flim/sasl-digest hides /usr/share/emacs/24.1/lisp/net/sasl-digest
/usr/share/emacs/24.1/site-lisp/flim/sasl hides /usr/share/emacs/24.1/lisp/net/sasl

Features:
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x-toolkit x multi-tty emacs)

Message #8 received at 13110 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mihir <mihir.cs.iitd <at> gmail.com>
Cc: 13110 <at> debbugs.gnu.org
Subject: Re: bug#13110: 24.1; Problem chaining archive-mode and tar-mode.
Date: Thu, 06 Dec 2012 22:14:10 -0500

> I was editing a debian binary package (.deb). Finding the file opens it
> in archive-mode, then finding the file 'data.tar.gz' opens it in
> tar-mode. I proceeded to edit the file, which produced a warning message
> reminding me to go and save the buffer for 'data.tar.gz'. However, when
> I attempted to save the buffer for 'data.tar.gz', I got an error message
> saying, "Symbol's value as variable is void: archive-ar-write-file-member".

> I think this is because of a conflict between the hooks added to
> 'write-file-functions' by archive-mode and tar-mode. I notice this is
> handled in archive-mode by this line in arc-mode.el:

There might be such a conflict, indeed (I don't know how well tarballs
inside archives are handled), but arc-mode.el does not support writing
to ar archives anyway.


        Stefan

Message #11 received at 13110 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Mihir <mihir.cs.iitd <at> gmail.com>
Cc: 13110 <at> debbugs.gnu.org
Subject: Re: bug#13110: 24.1; Problem chaining archive-mode and tar-mode.
Date: Mon, 31 May 2021 10:02:19 +0200

Mihir <mihir.cs.iitd <at> gmail.com> writes:

> I was editing a debian binary package (.deb). Finding the file opens it
> in archive-mode, then finding the file 'data.tar.gz' opens it in
> tar-mode. I proceeded to edit the file, which produced a warning message
> reminding me to go and save the buffer for 'data.tar.gz'. However, when
> I attempted to save the buffer for 'data.tar.gz', I got an error message
> saying, "Symbol's value as variable is void: archive-ar-write-file-member".

(I'm going through old bug reports that unfortunately got little response at
the time.)

I tried reproducing this in Emacs 28, but was unable to.  Instead I got
various variations on

---
archive-*-write-file-member: Updating was unsuccessful (1)
---

which seems to be the correct response, since Emacs doesn't support
editing ar (i.e., .deb) files.

So I'm closing this bug report.

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

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