1 files changed, 153 insertions, 0 deletions
diff --git a/extra/openrc/modloop.initd b/extra/openrc/modloop.initd
new file mode 100755
index 0000000..fb7006c
--- /dev/null
+++ b/extra/openrc/modloop.initd
@@ -0,0 +1,153 @@
+#!/sbin/openrc-run
+
+# script that will mount image with modules
+
+depend() {
+	after dev-mount
+	before checkfs fsck hwdrivers modules hwclock dev sysfs
+	keyword -vserver -lxc
+}
+
+# read kernel options
+init_KOPT() {
+	for opt in $(cat /proc/cmdline 2>/dev/null); do
+	        case "$opt" in
+			modloop=*|modloop_verify=*)
+				eval "KOPT_${opt%%=*}='${opt#*=}'" ;;
+		esac
+	done
+}
+
+mountdirs() {
+	awk '$2 !~ /^\/(sys|proc|dev|run)/ && $2 != "/" {print $2}' /proc/mounts
+}
+
+find_modloop() {
+	local dir="$1"
+	local kver=$(uname -r)
+	local oifs="$IFS"
+	IFS=$'\n'
+	set -- $(blkid "$dir"/boot/* "$dir"/*)
+	IFS="$oifs"
+	for line; do
+		img=${line%%:*}
+		verify_modloop "$img" || eerror "Failed to verify signature of $img!"
+		mount "$img" -o loop,ro /.modloop || continue
+		if [ -d /.modloop/modules/$kver ]; then
+			return 0
+		fi
+		umount /.modloop
+	done
+	return 1
+}
+
+verify_modloop() {
+	local modloop=$1 key=
+	if ! yesno "${KOPT_modloop_verify:=yes}"; then
+		return 0
+	fi
+	for key in /etc/apk/keys/*.pub; do
+		local sig=/var/cache/misc/${modloop##*/}.SIGN.RSA.${key##*/}
+		if [ -f "$sig" ]; then
+			if ! command -v openssl > /dev/null; then
+				ewarn "Missing openssl. Modloop verification disabled!"
+				return 0
+			fi
+			einfo "Verifying modloop"
+			openssl dgst -sha1 -verify "$key" -signature "$sig" "$modloop" \
+				>/dev/null 2>&1 || return 1
+		fi
+	done
+}
+
+find_backing_file() {
+	local dir="$1"
+	local dev=$(df -P "$dir" | tail -1 | awk '{print $1}')
+	cat /sys/block/${dev#/dev/}/loop/backing_file 2>/dev/null
+}
+
+start() {
+	local modloop= mount_opts= modloop_dldir="/lib"
+	init_KOPT
+
+	case "$KOPT_modloop" in
+		none) return 0;;
+		http://*|https://*|ftp://*)
+			modloop=$modloop_dldir/${KOPT_modloop##*/}
+			if [ ! -f "$modloop" ]; then
+				mkdir -p "$modloop_dldir"
+				wget -P "$modloop_dldir" "$KOPT_modloop" || eend 1
+			fi
+			;;
+		*)
+			for dir in $(mountdirs); do
+				if [ -f "$dir"/$KOPT_modloop ]; then
+					modloop="$dir/${KOPT_modloop##/}"
+					alpine_mnt="$dir"
+					break
+				fi
+			done
+			;;
+	esac
+
+	ebegin "Mounting modloop $modloop"
+	mkdir -p /.modloop
+	if [ -n "$modloop" ]; then
+		verify_modloop "$modloop" || eerror "Failed to verify signature of $img!"
+		mount -o loop,ro $modloop /.modloop
+		eend $? || return 1
+	else
+		for dir in $(mountdirs); do
+			if find_modloop "$dir"; then
+				alpine_mnt="$dir"
+				break
+			fi
+		done
+		if [ -d /.modloop/modules/$(uname -r) ]; then
+			eend 0
+		else
+			eend 1 || return 1
+		fi
+	fi
+
+	#use overlayfs if available and configured
+	if grep -q -w "overlay$" /proc/filesystems && [ ! -z ${unionfs_size+x} ]; then
+		ewarn "Use of unionfs_size is deprecated use overlay_size instead"
+		overlay_size="$unionfs_size"
+	fi
+	if grep -q -w "overlay$" /proc/filesystems && [ -n "$overlay_size" ]; then
+		ebegin "OverlayFS detected, mounting modloop rw"
+		[ "$overlay_size" != 0 ] && mount_ops="-o size=$overlay_size"
+		mkdir -p /.modoverlayfs /lib/modules
+		mount -t tmpfs $mount_ops tmpfs /.modoverlayfs
+		mkdir -p /.modoverlayfs/modules /.modoverlayfs/work
+		mount -t overlay -o upperdir=/.modoverlayfs/modules,lowerdir=/lib/modules:/.modloop/modules,workdir=/.modoverlayfs/work overlay /lib/modules
+		depmod -A
+		eend $? || return 1
+	else
+		rm -rf /lib/modules && ln -sf /.modloop/modules /lib/
+	fi
+
+	# copy firmware if there are any
+	if [ -d $alpine_mnt/firmware ]; then
+	        ebegin "Copying firmware from $alpine_mnt/firmware"
+	        cp -R -a $alpine_mnt/firmware /lib/
+	        eend $?
+	elif  [ -d /lib/modules/firmware ]; then
+		rmdir /lib/firmware 2>/dev/null \
+			&& ln -s /lib/modules/firmware /lib/
+	fi
+	return 0
+}
+
+stop() {
+	local ret=0
+	local mnt; for mnt in /lib/modules /.modoverlayfs /.modloop; do
+		if mountinfo --quiet "$mnt"; then
+			ebegin "Unmounting $mnt"
+			umount -d "$mnt" || ret=1
+		fi
+	done
+	eend $ret || return 1
+}
+