UBUNTU: [Debian] linux-image-extra is additive to linux-image

linux-image-extra is special, it is only additive to linux-image, this
means really cannot use the standard kernel postinst/postrm for this
package.  As it also depends on linux-image we know that linux-image will
have been installed before it, and will be removed after it.  On change
(installation/update/removal) of linux-image-extra we want to run the
kernel postinst to rebuilt the initramfs and update the bootloader
as necessary.  To this end switch to package specific postinst/postrm
which trigger the /etc/kernel/postinst.d hooks.  We need to do it this
way to get the specially parameterised incantations of update-initramfs,
to ensure we trigger the correct build rather than mearly dpkg triggering
a rebuild of the running kernel.

BugLink: http://bugs.launchpad.net/bugs/1375310Signed-off-by: Andy Whitcroft <apw@canonical.com>

debian/control-scripts/extra-post

+#!/bin/sh
+set -e
+
+case "$0::$1" in
+*.postinst::configure|*.postrm::remove|*.postrm::purge)
+	depmod -a -F /boot/System.map-=V =V || true
+	for dir in "/etc/kernel/postinst.d" "/etc/kernel/postinst.d/=V"
+	do
+		if [ -d "$dir" ]; then
+			run-parts --verbose --exit-on-error --arg="=V" --arg="/boot/=K-=V" "$dir"
+		fi
+	done
+	;;
+esac

debian/rules.d/2-binary-arch.mk

@@ -174,7 +174,7 @@ ifeq ($(do_extras_package),true)
 		for script in postinst postrm ; do				\
 			sed -e 's/=V/$(abi_release)-$*/g' -e 's/=K/$(instfile)/g'		\
 			    -e 's/=L/$(loader)/g'         -e 's@=B@$(build_arch)@g'		\
-			    debian/control-scripts/$$script > $(pkgdir_ex)/DEBIAN/$$script; \
+			    debian/control-scripts/extra-post > $(pkgdir_ex)/DEBIAN/$$script; \
 			chmod 755 $(pkgdir_ex)/DEBIAN/$$script;			\
 		done;								\
 	fi