I'm using zfs-dkms and spl-dkms packages to automatically build zfs
modules for any new kernel. Thanks to combination of two bugs:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629245
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=635563

I was unable to build spl and zfs modules when relevant -dkms packages
got upgraded from 0.6.0.98 to 0.6.1. My recovery from this problem would
be much much easier, if dkms wouldn't simply *remove* old modules
(generated earlier from old version of {zfs,spl}-dksm packages), but
rather back them up somewhere.

Granted, ideally I should be able to pull the modules out from backup.
Given how big the compiled modules are, I think it'd be completely
reasonable if dkms kept a copy of them.

We believe that the bug you reported is fixed in the latest version of
rake, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 704150@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Christian Hofstaedtler <zeha@debian.org> (supplier of updated rake package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Fri, 31 Jul 2015 08:29:08 +0200
Source: rake
Binary: rake
Architecture: source all
Version: 10.4.2-1
Distribution: sid
Urgency: medium
Maintainer: Debian Ruby Extras Maintainers <pkg-ruby-extras-maintainers@lists.alioth.debian.org>
Changed-By: Christian Hofstaedtler <zeha@debian.org>
Description:
 rake       - ruby make-like utility
Closes: 704150
Changes:
 rake (10.4.2-1) unstable; urgency=medium
 .
   * Team upload.
   * Remove obsolete d/require-rubygems.overrides
   * New upstream release: 10.4.2
     * Depends on newer minitest which is available in Debian.
       (Closes: #704150)
     * Remove upstream-applied patches.
   * debian/control: Replace XS-Testsuite with Testsuite
   * Update bash-completion install directory
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