I stand corrected. Only some flavors of Unix allow hardlinks to carry
separate permissions. I believe I became confused, because hardlinks
always allow separate path permissions.
i.e.
mkdir /tmp/fi
mkdir /tmp/bar
touch /tmp/fi/foo.txt
ln /tmp/fi/foo.txt /tmp/bar/foo.txt
chmod 000 /tmp/fi
chmod 777 /tmp/bar
Now that I think about it the last time I saw a Unix system that allowed the
actual files to have separate permissions was TitanOS. And that was a bad
idea, since most users used this feature to cheat the disk quota system.
Bill
----- Original Message -----
From: "Corinna Vinschen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, April 20, 2004 4:35 PM
Subject: Re: Emulating hard links on FAT et al.
> On Apr 20 15:00, Bill C. Riemers wrote:
> > One obvious thing hard links allow is a way to have the same file with
> > different permissions. With a symbolic link you need both access
> > permissions for the symbolic link and actual file. i.e.
> >
> > ln -s /tmp/foo.exe /home/bcr/foo.exe
> > chmod ugo-x /tmp/foo.exe
> > chmod ugo+x /home/bcr/foo.exe
> >
> > With a hardlink, you only need access permissions for the hardlink...
>
> That's not how it works. Hardlinks are nothing but multiple directory
> entries for the same file. The directory entry typically only consists
> of a name and a inode number. The inode contains the file specific
> control information. Obviously hardlinks to the same file point to
> the same inode. Therefore all hardlinks to the same file have the same
> permissions, owner, etc, since it's *one* file with *one* owner and *one*
> set of permissions. And, yes, it's implemented on NTFS like this.
>
>
> Corinna
>
> --
> Corinna Vinschen Please, send mails regarding Cygwin to
> Cygwin Co-Project Leader mailto:[EMAIL PROTECTED]
> Red Hat, Inc.
>
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