main/mkinitfs: cleanup links and initramfs on uninstall

(cherry picked from commit b6c52245)

main/mkinitfs/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=mkinitfs
 pkgver=2.0_rc6
-pkgrel=1
+pkgrel=2
 pkgdesc="Tool to generate initramfs images for Alpine"
 url=http://git.alpinelinux.org/cgit/mkinitfs
 depends="busybox apk-tools>=2.0_rc7"

main/mkinitfs/mkinitfs.trigger

@@ -3,16 +3,19 @@
 for i in "$@"; do
 	# get last element in path
 	flavor=${i##*/}
+	if ! [ -f "$i"/kernel.release ]; then
+		# kernel was uninstalled
+		rm -f $( readlink -f /boot/initramfs-$flavor ) \
+			/boot/initramfs-$flavor /boot/vmlinuz-$flavor \
+			/boot/$flavor /boot/$flavor.gz /$flavor /$flavor.gz
+		continue
+	fi
 	abi_release=$(cat "$i"/kernel.release)
 	initfs=initramfs-$abi_release
 	mkinitfs -o /boot/$initfs $abi_release
 	ln -sf $initfs /boot/initramfs-$flavor
 	ln -sf vmlinuz-$abi_release /boot/vmlinuz-$flavor
 
-	# extlinux will use path relative partition, so if /boot is on a
-	# separate partition we want /boot/<kernel> resolve to /<kernel>
-	[ -e /boot/boot ] || ln -sf / /boot/boot
-
 	#this is for compat. to be removed eventually...
 	ln -sf vmlinuz-$flavor /boot/$flavor
 	ln -sf initramfs-$flavor /boot/$flavor.gz
@@ -29,3 +32,9 @@ for i in "$@"; do
 	fi
 done
 
+# extlinux will use path relative partition, so if /boot is on a
+# separate partition we want /boot/<kernel> resolve to /<kernel>
+if ! [ -e /boot/boot ]; then
+	ln -sf / /boot/boot
+fi
+