[klibc] [PATCH] initramfs: multiple CPIO unpacking fix

Jeff Bailey jbailey at ubuntu.com
Tue Feb 21 18:14:01 PST 2006

Le mercredi 22 février 2006 à 10:45 +1100, Michael Neuling a écrit :
> 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.  

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)

Jeff Bailey

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

Linux for Human Beings.
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