Date: Tue, 21 Feb 2006 21:14:01 -0500
From: Jeff Bailey <jbailey@ubuntu.com>
Subject: Re: [klibc] [PATCH] initramfs: multiple CPIO unpacking fix
In-reply-to: <20060222104525.affda1df.mikey@neuling.org>
To: Michael Neuling <mikey@neuling.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, klibc@zytor.com,
       hpa@zytor.com, "miltonm@bga.com" <miltonm@bga.com>,
       Al Viro <viro@ftp.linux.org.uk>
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Le mercredi 22 f=C3=A9vrier 2006 =C3=A0 10:45 +1100, Michael Neuling a =C3=
=A9crit :
> The following patch unlinks (deletes) files, symlinks, FIFOs, devices
> etc before writing them when extracting CPIOs.  It doesn't delete
> directories.  This stops weird behaviour like:
>  1) writing through symlinks created in earlier CPIOs. eg foo->bar in
>     the first CPIO.  Having foo as a non link in a subsequent CPIO,
>     results in bar being written and foo remaining as a symlink. =20

I've tended to think of this as a feature, actually.  In Ubuntu, for
instance, we might have 2.6.15-8 and 2.6.15-9 which represent different
ABIs from security updates or other changes.  If I have a module that is
intended to be compatible with both, I might setup /lib/modules/generic
to be a symlink to /lib/modules/2.6.15-9/ and unpack the modules after
the symlink is expected to be there.

(I don't think we use this feature right now, but I had tested it and
noted it before.  It's very convenient, since it's the exact same
behaviour that dpkg itself has)

Tks,
Jeff Bailey

* Canonical Ltd * Ubuntu Service and Support * +1 514 691 7221 *

Linux for Human Beings.

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