GNU bug report logs - #11572
24.1.50; Emacs executable shadowed by an alias

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

From: sindikat <sindikat <at> riseup.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1.50; Emacs executable shadowed by an alias
Date: Mon, 28 May 2012 13:28:52 +0600

There is an obscure behavior when command 'emacsclient -c -a ""' cease
to create a daemon, when there is none running. To reproduce do the
following:

1. Create an alias 'emacs=emacsclient -c -a ""' or executable named
   'emacs' in $PATH, which is a shell script with 'emacsclient -c -a ""'
it.

2. Kill all daemons if there are such.

3. Run 'emacs'.

You would think Emacs finds there is no daemon and runs Emacs daemon
and then Emacsclient, but because internally it calls
'emacs' command, it enters an infinite recursion calling emacs alias,
which calls emacsclient, which calls emacs alias etc.

To correct the behavior, emacsclient should internally use 'which' or
some other way to not call the alias, i think.

I use Emacs 24, build 20120524 from emacs.naquadah.org on Linux Mint
Debian Edition.


In GNU Emacs 24.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
 of 2012-05-24 on zelenka, modified by Debian
 (emacs-snapshot package, version 2:20120524-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11104000
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/24.1.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1.50/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''

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.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  icomplete-mode: t
  global-linum-mode: t
  linum-mode: t
  show-paren-mode: t
  ido-everywhere: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  global-whitespace-mode: t
  ergoemacs-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

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M-u M-u M-u M-u M-u M-H M-n M-N C-h v g n u s - l o 
a d <tab> <return> M-r q M-a g n u s <return> g q y 
C-o e m <backspace> <backspace> M-f l <return> t a 
s M-i <return> M-o r i s e u p M-i C-w M-a r i s <backspace> 
<backspace> <backspace> r e p o r t - <tab> <retur
n>

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font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Message #8 received at 11572 <at> debbugs.gnu.org (full text, mbox):

From: Juanma Barranquero <lekktu <at> gmail.com>
To: sindikat <sindikat <at> riseup.net>
Cc: 11572 <at> debbugs.gnu.org
Subject: Re: bug#11572: 24.1.50; Emacs executable shadowed by an alias
Date: Mon, 28 May 2012 09:37:05 +0200

On Mon, May 28, 2012 at 9:28 AM, sindikat <sindikat <at> riseup.net> wrote:

> You would think Emacs finds there is no daemon and runs Emacs daemon
> and then Emacsclient, but because internally it calls
> 'emacs' command, it enters an infinite recursion calling emacs alias,
> which calls emacsclient, which calls emacs alias etc.

Isn't that a case of "if it hurts doing that, don't do that"?

> To correct the behavior, emacsclient should internally use 'which' or
> some other way to not call the alias, i think.

What if the user wants to really use an alias (just not "emacs", another one)?

    Juanma

Message #11 received at 11572 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: sindikat <sindikat <at> riseup.net>
Cc: 11572 <at> debbugs.gnu.org
Subject: Re: bug#11572: 24.1.50; Emacs executable shadowed by an alias
Date: Mon, 28 May 2012 10:19:31 -0400

> 1. Create an alias 'emacs=emacsclient -c -a ""' or executable named
>    'emacs' in $PATH, which is a shell script with 'emacsclient -c -a ""'

If you really have an other `emacs' in the $PATH, I think "you get what
you ask for", kind of.  But I agree that emacsclient should not obey
shell aliases, because it should not run "emacs" via a shell.


        Stefan

Message #14 received at 11572 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: sindikat <sindikat <at> riseup.net>, 11572 <at> debbugs.gnu.org
Subject: Re: bug#11572: 24.1.50; Emacs executable shadowed by an alias
Date: Mon, 28 May 2012 19:54:37 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> But I agree that emacsclient should not obey shell aliases, because it
> should not run "emacs" via a shell.

Non-interactive shells don't obey aliases.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #17 received at 11572 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: sindikat <sindikat <at> riseup.net>, 11572 <at> debbugs.gnu.org
Subject: Re: bug#11572: 24.1.50; Emacs executable shadowed by an alias
Date: Mon, 28 May 2012 15:40:39 -0400

tags 11572 moreinfo
thanks

>> But I agree that emacsclient should not obey shell aliases, because it
>> should not run "emacs" via a shell.
> Non-interactive shells don't obey aliases.

While that's generally more or less true, the details depend on how you
define your aliases and which shell you're using.
But in any case, AFAICT emacsclient.c does not run "emacs" via a shell
(it uses execvp), so no matter what shell you use and how you define
your aliases I don't see how an "emacs" alias can cause the problem the
OP described.

Sindikat, can you really reproduce your problem with just an alias
'emacs=emacsclient -c -a ""', or do you actually need to have an "emacs"
script in your $PATH?


        Stefan

Message #24 received at 11572-done <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 11572-done <at> debbugs.gnu.org
Subject: Re: bug#11572: 24.1.50; Emacs executable shadowed by an alias
Date: Wed, 06 Jun 2012 16:52:23 -0400

Stefan Monnier wrote:

> Sindikat, can you really reproduce your problem with just an alias
> 'emacs=emacsclient -c -a ""', or do you actually need to have an "emacs"
> script in your $PATH?

No answer, but it's basically impossible for a shell alias to cause the
described issue.

As has been said, it's a feature that emacsclient -a "" uses "emacs"
from PATH. If you have a script "emacs" in PATH, you'll need to make it
more sophisticated (eg, check for the --daemon option that emacsclient
passed in this case).

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