purge of package causes generation of new initrd.img

Johan Kiviniemi suggested on IRC that, instead of calling update-initramfs directly, linux-ubuntu-modules-*.postrm should activate a dpkg trigger with the kernel version in its name (that is, more specific than the existing update-initramfs trigger which updates the current initramfs version). This trigger would be provided by the linux-image-* package, so that if you remove the corresponding linux-image-* in the same dpkg run then you don't need to have disk space to regenerate the initramfs.

I think it's too late to attempt to do this for 8.04, but I'd be happy to offer implementation advice later if needed.

A proposed solution:

Have linux-image-$VER provide a trigger called update-initramfs-$VER, and have maintscripts activate that trigger. When purging linux-image-2.6.24-12-generic, the trigger code for 2.6.24-12-generic would just vanish before getting called.

Heh, Colin was faster. :-)

I might add that update-initramfs currently ends up being called twice in a row when dpkg first removes linux-ubuntu-modules-$VER and then purges it. Using a versioned trigger would reduce the number of calls to one, or to zero if the equivalent linux-image package is removed as well.

Removing linux-ubuntu-modules-2.6.24-14-generic ...
update-initramfs: Generating /boot/initrd.img-2.6.24-14-generic
Purging configuration files for linux-ubuntu-modules-2.6.24-14-generic ...
update-initramfs: Generating /boot/initrd.img-2.6.24-14-generic

Probably related to bug #149836.

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