bug#74146: ESHELL prompt shows incorrect working directory on a TRAMP remote host

bug#74146: ESHELL prompt shows incorrect working directory on a TRAMP remote host

[dnym--- via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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DESCRIPTION OF PROBLEM:

Running emacs -Q for emacs 29.4 (build 2, x86_64-w64-mingw32):

~/.ssh $ cd /sshx:oracle-root:/
/sshx:oracle-root:~/ $ pwd
/sshx:oracle-root:/home/opc/
/sshx:oracle-root:~/ $ /bin/pwd
/

There should be no tilde before / on the second line and the `pwd`
command (which is eshell's own `pwd` written in elisp) on the second
line should not report .../home/opc/ but rather /sshx:oracle-root: like
below.

Running emacs -Q for emacs 27.2 (build 1, ....redhat):

~/.ssh $ cd /ssh:oracle-root:/
/ssh:oracle-root: $ pwd
/ssh:oracle-root:
/ssh:oracle-root: $ /bin/pwd
/

____________________________________


In GNU Emacs 29.4 (build 2, x86_64-w64-mingw32) of 2024-06-23 built on
 fv-az1388-367
Windowing system distributor 'Microsoft Corp.', version 10.0.22631
System Description: Microsoft Windows 10 Pro (v10.0.2009.22631.4391)

Configured using:
 'configure --prefix=/mingw64 --host=x86_64-w64-mingw32
 --build=x86_64-w64-mingw32 --with-modules --without-dbus
 --without-compress-install --with-tree-sitter
 --with-native-compilation=aot 'CFLAGS=-march=nocona -msahf
 -mtune=generic -O2 -pipe -fstack-protector-strong
 -fno-optimize-sibling-calls -Wno-error=implicit-function-declaration'
 CPPFLAGS=-D__USE_MINGW_ANSI_STDIO=1 'LDFLAGS= -lpthread''

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LIBXML2 MODULES NATIVE_COMP NOTIFY
W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
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  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
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  tool-bar-mode: t
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  file-name-shadow-mode: t
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  font-lock-mode: t
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Load-path shadows:
None found.

Features:
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emacs)

Memory information:
((conses 16 79952 8898)
 (symbols 48 7176 0)
 (strings 32 21044 1276)
 (string-bytes 1 610559)
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bug#74146: ESHELL prompt shows incorrect working directory on a TRAMP remote host

[Jim Porter]

On 10/31/2024 1:11 PM, dnym--- via Bug reports for GNU Emacs, the Swiss 
army knife of text editors wrote:
> 
> DESCRIPTION OF PROBLEM:
> 
> Running emacs -Q for emacs 29.4 (build 2, x86_64-w64-mingw32):
> 
> ~/.ssh $ cd /sshx:oracle-root:/
> /sshx:oracle-root:~/ $ pwd
> /sshx:oracle-root:/home/opc/
> /sshx:oracle-root:~/ $ /bin/pwd
> /
> 
> There should be no tilde before / on the second line and the `pwd`
> command (which is eshell's own `pwd` written in elisp) on the second
> line should not report .../home/opc/ but rather /sshx:oracle-root: like
> below.

Thanks for the report. This is an MS-Windows only issue, fixed in 
33997047e891d5513c4f33ab78ad353746ed16e2 on Emacs master (so version 31).

In the meantime though, you can customize 'eshell-pwd-convert-function' 
to avoid this mis-conversion; the 'identity' option should work. (I'm 
not actually sure why this has a different default value on MS-Windows 
vs other paltforms, but it's been that way for a long time so I'll just 
about opening that can of worms for now...)

bug#74146: ESHELL prompt shows incorrect working directory on a TRAMP remote host

[Eli Zaretskii]

> Date: Thu, 31 Oct 2024 17:39:48 -0700
> From: Jim Porter <jporterbugs@gmail.com>
> 
> Thanks for the report. This is an MS-Windows only issue, fixed in 
> 33997047e891d5513c4f33ab78ad353746ed16e2 on Emacs master (so version 31).
> 
> In the meantime though, you can customize 'eshell-pwd-convert-function' 
> to avoid this mis-conversion; the 'identity' option should work. (I'm 
> not actually sure why this has a different default value on MS-Windows 
> vs other paltforms, but it's been that way for a long time so I'll just 
> about opening that can of worms for now...)

I'm guessing that the difference is because we want to convert any
backslashes into forward slashes, and also make the drive letter
explicit if needed.  Perhaps it is worth our while to add a comment to
this effect there.