Difference between file-accessible-directory-p() and file-readable-p() on a directory

Difference between file-accessible-directory-p() and file-readable-p() on a directory

[Nordlöw]

What's the difference between file-accessible-directory-p and file-
readable-p when the argument is a directory?

/Nordlöw

Re: Difference between file-accessible-directory-p() and file-readable-p() on a directory

[Glenn Morris]

Nordlöw wrote:

> What's the difference between file-accessible-directory-p and file-
> readable-p when the argument is a directory?

mkdir foo bar
chmod 500 foo
chmod 400 bar

cd bar  # Permission denied
cd foo  # No problem

(file-accessible-directory-p "foo")  ; t
(file-readable-p "foo")              ; t

(file-accessible-directory-p "bar")  ; nil
(file-readable-p "bar")              ; t

You need execute permission to access a directory (on a Unix-type
system; no idea about Windows).

Re: Difference between file-accessible-directory-p() and file-readable-p() on a directory

[Eli Zaretskii]

> From: Glenn Morris <rgm+news@stanford.edu>
> Date: Thu, 24 Sep 2009 18:04:22 -0700
> 
> You need execute permission to access a directory (on a Unix-type
> system; no idea about Windows).

There's no "execute permission" on Windows, on the level on which
`chmod' operates.  Programs that want to see Posix-style mode bits,
such as Emacs, invent that bit when they see a directory or an
executable program/script.

(NTFS-style file security does have attributes for directory traversal
and for program execution permissions, but Emacs does not yet support
those, and neither do most ports of `chmod'.)