GNU bug report logs - #65308
(find-file) botches buffer-file-name in -batch mode

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Konstantin Kharlamov <Hi-Angel <at> yandex.ru>
Subject: bug#65308: closed (Re: bug#65308: (find-file) botches
 buffer-file-name in -batch mode)
Date: Tue, 15 Aug 2023 12:27:02 +0000

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Your bug report

#65308: (find-file) botches buffer-file-name in -batch mode

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 65308 <at> debbugs.gnu.org.

-- 
65308: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65308
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Konstantin Kharlamov <Hi-Angel <at> yandex.ru>
Cc: 65308-done <at> debbugs.gnu.org
Subject: Re: bug#65308: (find-file) botches buffer-file-name in -batch mode
Date: Tue, 15 Aug 2023 15:26:37 +0300

> From: Konstantin Kharlamov <Hi-Angel <at> yandex.ru>
> Cc: 65308 <at> debbugs.gnu.org
> Date: Tue, 15 Aug 2023 15:17:00 +0300
> 
> On Tue, 2023-08-15 at 15:03 +0300, Eli Zaretskii wrote:
> > There's no bug here.  To get what you want, run the command-line
> > arguments through expand-file-name _before_ calling find-file.
> 
> Oh, okay, thank you, I see. I settled with calling a `(kill-buffer)`
> after `(save-buffer)`, which I guess works because each time the buffer
> is killed we get back to the *scratch* buffer that has the original
> "current directory".

Yes, that will work, as will using save-current-buffer etc.  But
please note that relying on the default-directory of some random
buffer when using relative file names is always fraught with surprises
in Emacs, which is why I suggested to use expand-file-name instead.

Closing.

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From: Konstantin Kharlamov <Hi-Angel <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: (find-file) botches buffer-file-name in -batch mode
Date: Tue, 15 Aug 2023 14:25:16 +0300

This was found while trying to use Emacs in `-batch` mode to regexp-
replace many files in a project. Turns out calling `(save-buffer)` will
make it say that directory does not exist, and the reason for that is
that `buffer-file-name` gets mangled filename.

# Steps to reproduce

	$ mkdir dir && touch dir/1 dir/2
	$ emacs -batch --eval '(progn (dolist (file command-line-args-left) (find-file file) (print buffer-file-name))))' dir/1 dir/2                                    

	"/tmp/dir/1"

	"/tmp/dir/dir/2"

## Expected

Second print would say `/tmp/dir/2`

## Actual

Second print refers to non-existing `/tmp/dir/dir/2`.

# Versions tested

Reproducible with stable 29.1 and somewhat old master as of commit
04710bd01b2

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