GNU bug report logs - #56355
29.0.50; Implement file-parent-directory

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Package: emacs;

Reported by: daanturo <daanturo <at> gmail.com>

Date: Sat, 2 Jul 2022 11:07:01 UTC

Severity: normal

Found in version 29.0.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Full log

Message #35 received at submit <at> debbugs.gnu.org (full text, mbox):

From: daanturo <daanturo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#56355: 29.0.50; Implement file-parent-directory
Date: Thu, 1 Sep 2022 11:11:31 +0700

[Message part 1 (text/plain, inline)]
In the case of a circular symlink, technically it's still correct to return
non-nil.

```
ls -l /tmp/foo

total 0
lrwxrwxrwx 1 me me 9 Sep  1 10:59 foo -> /tmp/foo/
```

In this case:
```
;;; because
(file-equal-p "/tmp/foo/foo/" "/tmp/foo/")
=> t

;;; therefore

(my-parent-directory "/tmp/foo/foo/") ; (the equal version)
=> "/tmp/foo/"

(file-parent-directory "/tmp/foo/foo/")
=> nil

```

Obviously, the `equal` version fits our expectation better, although that's a
mistake at the time of link creation, "/tmp/foo/foo"'s parent still exists and
not a nil value.

Not to mention `file-equal-p` needs an active TRAMP connection for remote files.

-- 
Daanturo.

[0001-Change-file-parent-directory-s-behavior.patch (text/x-patch, attachment)]
This bug report was last modified 2 years and 317 days ago.

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