From: Linus Torvalds <torvalds@osdl.org>
Date: Mon, 03 Oct 2005 18:18:15 GMT
Subject: Re: Honor extractor's umask in git-tar-tree.
Message-ID: <Pine.LNX.4.64.0510031113500.31407@g5.osdl.org>
In-Reply-To: <434172FD.7020302@zytor.com>



On Mon, 3 Oct 2005, H. Peter Anvin wrote:
>
> Linus Torvalds wrote:
> > 
> > As to tar: I think the current
> > 
> >         if (S_ISDIR(mode) || S_ISREG(mode))
> >                 mode |= (mode & 0100) ? 0777 : 0666;
> > 
> > is wrong. It makes things world-writable by default, and that's just
> > dangerous.
> 
> That's standard in the Unix world, though; of course, the user's umask
> shouldn't be set to zero unless things are in very special circumstances.  In
> the case of tar, the umask is applied on extraction unless the user explicitly
> specifies -p.

Is it? The only place umask is mentioned in the man-page is

       --no-same-permissions
              apply  user?s  umask  when  extracting files instead of recorded
              permissions

but if tar really does honor umask, then hey, that 0777/0666 is fine.

(Ahh, googling a bit more, it appears that "-p" is default for root, which 
explains why you'd need the "anti-flag").

		Linus