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Re: [PATCH] POSIX ACL support

From: Paul Eggert
Subject: Re: [PATCH] POSIX ACL support
Date: Wed, 21 Nov 2012 10:25:21 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121029 Thunderbird/16.0.2

On 11/21/12 10:17, Eli Zaretskii wrote:
> Can a user on a Posix
> host always copy the ACLs, no matter what access right these ACLs
> specify?

I don't know of any exception, no, though I don't pretend to be
an expert on Posix ACLS.

> And in addition, this could be inconvenient or even dangerous: you
> could set access rights on a file you created that give you no access
> at all, not even read access.

This couldn't happen for files that you're copying, since if you can't
read them you can't copy them anyway.  But anyway, it's OK to create
files that you can't read -- Emacs already can do that, I expect.

Romain's point about special file handlers is a good one.  If we
want this to work with Tramp we have to have a way in C or in Lisp
to represent all the file metadata, so that we can copy it.  Doing
this correctly would solve not only this problem, but some other bugs
in this area (e.g., group or group permission is wrong, time stamps
are truncated).

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