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mkinitfs: add option to avoid including kernel-specific files

This allows one to make a generic initramfs that doesn't require a running
kernel identical to the one used for booting, if said kernel already includes
everything it needs to function (such as compiling everything in instead of
using kernel modules).

--- a/mkinitfs.in

+++ b/mkinitfs.in

@@ -102,6 +102,7 @@

 }

 initfs_kmods() {

+	[ -z "$nokernel" ] || return

 	local glob= file= files= dirs=

 	rm -rf "$tmpdir"/lib/modules

 	# make sure we have modules.dep

@@ -123,6 +124,7 @@

 }

 initfs_firmware() {

+	[ -z "$nokernel" ] || return

 	rm -rf "$tmpdir"/lib/firmware

 	mkdir -p "$tmpdir"/lib/firmware

 	find "$tmpdir"/lib/modules -type f -name "*.ko" | xargs modinfo -F firmware | sort -u | while read FW; do

@@ -149,7 +151,7 @@

 usage() {

 	cat <<EOF

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

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

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

 options:

 	-b  prefix files and kernel modules with basedir

@@ -162,6 +164,7 @@

 	-K  copy also host keys to initramfs

 	-l  only list files that would have been used

 	-L  list available features

+	-n  don't include kernel modules or firmware

 	-o  set another outfile

 	-q  Quiet mode

 	-t  use tempdir when creating initramfs image

@@ -173,7 +176,7 @@

 # main

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

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

 	case "$opt" in

 		b) basedir="$OPTARG";;

 		c) config="$OPTARG";;

@@ -185,6 +188,7 @@

 		K) hostkeys=1;;

 		L) list_features=1;;

 		l) list_sources=1;;

+		n) nokernel=1;;

 		o) outfile="$OPTARG";;

 		q) quiet=1;;

 		t) tmpdir="$OPTARG";;

@@ -210,18 +214,22 @@

 [ "${basedir}" = "${basedir#/}" ] && basedir="${PWD}/${basedir}"

-[ -n "$1" ] && kernel="$1"

-[ -z "$kernel" ] && kernel=$(uname -r)

-kerneldir="${basedir}lib/modules/$kernel"

+if [ -z "$nokernel" ]; then

+	[ -n "$1" ] && kernel="$1"

+	[ -z "$kernel" ] && kernel=$(uname -r)

+	kerneldir="${basedir}lib/modules/$kernel"

-kflavor=${kernel##*-}

-[ "$kflavor" = "$kernel" ] && kflavor=vanilla

+	kflavor=${kernel##*-}

+	[ "$kflavor" = "$kernel" ] && kflavor=vanilla

+else

+	kflavor=generic

+fi

 if [ -z "$outfile" ]; then

 	outfile="${basedir}boot/initramfs-${kflavor}"

 fi

-if [ ! -d "$kerneldir" ]; then

+if [ -z "$nokernel"] && [ ! -d "$kerneldir" ]; then

 	echo "$kerneldir does not exist or is not a directory"

 	exit 1

 fi