GNU logs - #66903, boring messages

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Subject: bug#66903: 29.1; shell-mode directory tracking incorrectly handles double slashes
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Reproduce:

(assume ~/bin exists)

1. M-x shell RET
2. cd ~//bin RET
3. M-: default-directory RET

Expected:

default-directory is ~/bin

Actual:

default-directory is /bin

It seems like the directory tracker uses Emacs's convention for double
slashes "resetting" a path to root, but most shells treat double slashes
the same as single slashes.

It looks like this should be fixed in `shell-cd` (which should also fix
`shell-process-pushd`) by implementing "custom" path handling (compared
to Emacs default path handling behavior).

In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.37,
 cairo version 1.16.0) of 2023-09-03, modified by Debian built on
 kokoro-ubuntu
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux rodete

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<div dir=3D"ltr">Reproduce:<br><br>(assume ~/bin exists)<br><br>1. M-x shel=
l RET<br>2. cd ~//bin RET<br>3. M-: default-directory RET<br><br>Expected:<=
br><br>default-directory is ~/bin<br><br>Actual:<br><br>default-directory i=
s /bin<br><br>It seems like the directory tracker uses Emacs&#39;s conventi=
on for double<br>slashes &quot;resetting&quot; a path to root, but most she=
lls treat double slashes<br>the same as single slashes.<br><br>It looks lik=
e this should be fixed in `shell-cd` (which should also fix<br>`shell-proce=
ss-pushd`) by implementing &quot;custom&quot; path handling (compared<br>to=
 Emacs default path handling behavior).<br><br>In GNU Emacs 29.1 (build 1, =
x86_64-pc-linux-gnu, GTK+ Version 3.24.37,<br>=C2=A0cairo version 1.16.0) o=
f 2023-09-03, modified by Debian built on<br>=C2=A0kokoro-ubuntu<br>Windowi=
ng system distributor &#39;The X.Org Foundation&#39;, version 11.0.12101007=
<br>System Description: Debian GNU/Linux rodete<br></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Allen Li <darkfeline@HIDDEN>
Subject: bug#66903: Acknowledgement (29.1; shell-mode directory tracking
 incorrectly handles double slashes)
Message-ID: <handler.66903.B.169897054327195.ack <at> debbugs.gnu.org>
References: <CADbSrJz6a2xudEBbwhDW=OTKTMWQux=Mpc3dyskJ5cESOo4h8w@HIDDEN>
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Date: Fri, 03 Nov 2023 00:16:01 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#66903: 29.1; shell-mode directory tracking incorrectly handles double slashes
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Allen Li <darkfeline@HIDDEN>
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Date: Fri, 03 Nov 2023 09:15:59 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
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 (message from Allen Li on Thu, 2 Nov 2023 17:14:36 -0700)
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severity 66903 wishlist
thanks

> From: Allen Li <darkfeline@HIDDEN>
> Date: Thu, 2 Nov 2023 17:14:36 -0700
> 
> (assume ~/bin exists)
> 
> 1. M-x shell RET
> 2. cd ~//bin RET
> 3. M-: default-directory RET
> 
> Expected:
> 
> default-directory is ~/bin
> 
> Actual:
> 
> default-directory is /bin

This is the standard Emacs behavior: double slash makes everything
before that ignored.

> It seems like the directory tracker uses Emacs's convention for double
> slashes "resetting" a path to root, but most shells treat double slashes
> the same as single slashes.

"M-x shell" is not a shell, it is an Emacs interface to a shell.
Thus, it should be free to implement behavior not present in the
shell, if we consider it convenient for Emacs users.

> It looks like this should be fixed in `shell-cd` (which should also fix
> `shell-process-pushd`) by implementing "custom" path handling (compared
> to Emacs default path handling behavior).

This is not a bug.  I'm okay with adding a new optional feature that
would disable the above behavior, but it must be off by default.

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

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Date: Fri, 03 Nov 2023 09:15:59 +0200
Message-Id: <83pm0r71e8.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Allen Li <darkfeline@HIDDEN>
In-Reply-To: <CADbSrJz6a2xudEBbwhDW=OTKTMWQux=Mpc3dyskJ5cESOo4h8w@HIDDEN>
 (message from Allen Li on Thu, 2 Nov 2023 17:14:36 -0700)
Subject: Re: bug#66903: 29.1;
 shell-mode directory tracking incorrectly handles double slashes
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severity 66903 wishlist
thanks

> From: Allen Li <darkfeline@HIDDEN>
> Date: Thu, 2 Nov 2023 17:14:36 -0700
> 
> (assume ~/bin exists)
> 
> 1. M-x shell RET
> 2. cd ~//bin RET
> 3. M-: default-directory RET
> 
> Expected:
> 
> default-directory is ~/bin
> 
> Actual:
> 
> default-directory is /bin

This is the standard Emacs behavior: double slash makes everything
before that ignored.

> It seems like the directory tracker uses Emacs's convention for double
> slashes "resetting" a path to root, but most shells treat double slashes
> the same as single slashes.

"M-x shell" is not a shell, it is an Emacs interface to a shell.
Thus, it should be free to implement behavior not present in the
shell, if we consider it convenient for Emacs users.

> It looks like this should be fixed in `shell-cd` (which should also fix
> `shell-process-pushd`) by implementing "custom" path handling (compared
> to Emacs default path handling behavior).

This is not a bug.  I'm okay with adding a new optional feature that
would disable the above behavior, but it must be off by default.

Message sent to bug-gnu-emacs@HIDDEN:

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On Fri, Nov 3, 2023 at 12:16=E2=80=AFAM Eli Zaretskii <eliz@HIDDEN> wrote:

>
> "M-x shell" is not a shell, it is an Emacs interface to a shell.
> Thus, it should be free to implement behavior not present in the
> shell, if we consider it convenient for Emacs users.
>

The behavior it is supposed to implement is that it tracks the working
directory of the shell.
Currently, it fails to do so for most shells that a user would use.
In fact, it fails to do so for the default value `/bin/bash`.


> > It looks like this should be fixed in `shell-cd` (which should also fix
> > `shell-process-pushd`) by implementing "custom" path handling (compared
> > to Emacs default path handling behavior).
>
> This is not a bug.  I'm okay with adding a new optional feature that
> would disable the above behavior, but it must be off by default.
>

This is absolutely a bug.  The feature, where shell-mode attempts to track
the working
directory of its subshell, fails to work for most shells in existence
(e.g., derivatives of POSIX sh, csh, zsh, etc.) and including the default
shell.

I agree it may be an option, but I disagree that it should be off by
default, given that the
default configured shell Bash requires it.

--00000000000078b3ed06093a5ee3
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div dir=3D"ltr">On Fri, Nov 3, 2023 at 12:16=E2=80=AFAM E=
li Zaretskii &lt;<a href=3D"mailto:eliz@HIDDEN">eliz@HIDDEN</a>&gt; wrote=
:<br></div><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">
<br>
&quot;M-x shell&quot; is not a shell, it is an Emacs interface to a shell.<=
br>
Thus, it should be free to implement behavior not present in the<br>
shell, if we consider it convenient for Emacs users.<br></blockquote><div><=
br></div><div>The behavior it is supposed to implement is that it tracks th=
e working directory of the shell.</div><div>Currently, it fails to do so fo=
r most shells that a user would use.</div><div>In fact, it fails to do so f=
or the default value `/bin/bash`.</div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">
&gt; It looks like this should be fixed in `shell-cd` (which should also fi=
x<br>
&gt; `shell-process-pushd`) by implementing &quot;custom&quot; path handlin=
g (compared<br>
&gt; to Emacs default path handling behavior).<br>
<br>
This is not a bug.=C2=A0 I&#39;m okay with adding a new optional feature th=
at<br>
would disable the above behavior, but it must be off by default.<br></block=
quote><div><br></div><div>This is absolutely a bug.=C2=A0 The feature, wher=
e shell-mode attempts to track the working=C2=A0</div><div>directory of its=
 subshell, fails to work for most shells in existence=C2=A0</div><div>(e.g.=
, derivatives of POSIX sh, csh, zsh, etc.) and including the default shell.=
=C2=A0<br><br>I agree it may be an option, but I disagree that it should be=
 off by default, given that the=C2=A0</div><div>default configured shell Ba=
sh requires it.</div></div></div>

--00000000000078b3ed06093a5ee3--

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> From: Allen Li <darkfeline@HIDDEN>
> Date: Fri, 3 Nov 2023 00:22:26 -0700
> Cc: 66903 <at> debbugs.gnu.org
> 
> On Fri, Nov 3, 2023 at 12:16 AM Eli Zaretskii <eliz@HIDDEN> wrote:
> 
>  "M-x shell" is not a shell, it is an Emacs interface to a shell.
>  Thus, it should be free to implement behavior not present in the
>  shell, if we consider it convenient for Emacs users.
> 
> The behavior it is supposed to implement is that it tracks the working directory of the shell.
> Currently, it fails to do so for most shells that a user would use.
> In fact, it fails to do so for the default value `/bin/bash`.
>  
>  > It looks like this should be fixed in `shell-cd` (which should also fix
>  > `shell-process-pushd`) by implementing "custom" path handling (compared
>  > to Emacs default path handling behavior).
> 
>  This is not a bug.  I'm okay with adding a new optional feature that
>  would disable the above behavior, but it must be off by default.
> 
> This is absolutely a bug.  The feature, where shell-mode attempts to track the working 
> directory of its subshell, fails to work for most shells in existence 
> (e.g., derivatives of POSIX sh, csh, zsh, etc.) and including the default shell. 
> 
> I agree it may be an option, but I disagree that it should be off by default, given that the 
> default configured shell Bash requires it.

I think we disagree about what should be fixed: the value of
default-directory or the directory to which "cd ~//bin" switches.

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