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mkinitfs: add -K flag to copy host keys to new initramfs

this is mainly to copy the developer keys present on build system
to the target initramfs. simplifies creating your own initramfs
and when your key is not packaged.

--- a/mkinitfs.in

+++ b/mkinitfs.in

@@ -133,6 +133,7 @@

 initfs_apk_keys() {

 	mkdir -p "$tmpdir"/etc/apk/keys

+	[ "$hostkeys" ] && cp "/etc/apk/keys/"* "$tmpdir"/etc/apk/keys/

 	cp "${basedir}etc/apk/keys/"* "$tmpdir"/etc/apk/keys/

 }

@@ -148,7 +149,7 @@

 usage() {

 	cat <<EOF

-usage: mkinitfs [-hkLl] [-b basedir] [-c configfile] [-F features] [-f fstab]

+usage: mkinitfs [-hkKLl] [-b basedir] [-c configfile] [-F features] [-f fstab]

 		[-i initfile ] [-o outfile] [-t tempdir] [kernelversion]"

 options:

 	-b  prefix files and kernel modules with basedir

@@ -158,6 +159,7 @@

 	-h  print this help

 	-i  use initfile as init instead of $init

 	-k  keep tempdir

+	-K  copy also host keys to initramfs

 	-l  only list files that would have been used

 	-L  list available features

 	-o  set another outfile

@@ -171,7 +173,7 @@

 # main

-while getopts "b:c:f:F:hi:kLlo:qt:" opt; do

+while getopts "b:c:f:F:hi:kKLlo:qt:" opt; do

 	case "$opt" in

 		b) basedir="$OPTARG";;

 		c) config="$OPTARG";;

@@ -180,6 +182,7 @@

 		h) usage;;

 		i) init=$OPTARG;;

 		k) keeptmp=1;;

+		K) hostkeys=1;;

 		L) list_features=1;;

 		l) list_sources=1;;

 		o) outfile="$OPTARG";;