[Bug 125816] Re: linux-image postinst matches header_postinst_hook for postinst_hook incorrectly

[Matt Domsch]

you can install http://linux.dell.com/dkms/debian/dkms_2.0.17-1_all.deb
which will demonstrate the problem on kernels produced by the older
kernel-package, upgrade the kernel to one built with the newer kernel-
package (with the above patch applied) and see that it no longer
demonstrates the problem.

The demonstrated problem is that when installing a kernel built with the
broken kernel-package, DKMS is invoked twice - once by post_hook and
once by /etc/kernel/postinst.d/dkms; but update-grub is _never_ called
from postinst_hook (because postinst_hook was overwritten with the value
from header_postinst_hook, namely invoking dkms).  DKMS should only be
invoked once (from /etc/kernel/postinst.d/dkms) and update-grub should
be invoked from postinst_hook.

I'm working on packaging newer copies of DKMS, but am torn; should it
try to use header_postinst_hook at all?  If it does, then it's subject
to this breakage.  If it does not, then there's a chance that the
ordering of dpkg installs of new linux-image and linux-headers packages
will cause the dkms_autoinstaller to fail.  I need the
dkms_autoinstaller to be run after both linux-image and linux-headers
are installed.  To guarantee this, I've been hooking both of those
package's postinst hooks, so regardless of install order
dkms_autoinstaller is run after they're both installed.

I'm open to advice on this point.

** Changed in: ubuntu
     Assignee: (unassigned) => Ubuntu Kernel Team
       Status: Invalid => Confirmed

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linux-image postinst matches header_postinst_hook for postinst_hook incorrectly
https://bugs.launchpad.net/bugs/125816
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