initramfs-framework: add nfsrootfs module

nfsrootfs module mounts rootfs via nfs parsing "nfsroot" and "ip" cmdline options.

(From OE-Core rev: d1737f2dabac5e338061863c78a91b4c115365c7)

Signed-off-by: Oleksii Konoplitskyi <okonopli@cisco.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs

@@ -0,0 +1,48 @@
+#!/bin/sh
+
+nfsrootfs_enabled() {
+	if [ ${bootparam_root} != "/dev/nfs" ] || [ -z ${bootparam_nfsroot} ]; then
+		return 1
+	fi
+	return 0
+}
+
+nfsrootfs_run() {
+	local nfs_opts
+	local location
+	local flags
+	local server_ip
+
+	nfs_opts=""
+	if [ "${bootparam_nfsroot#*,}" != "${bootparam_nfsroot}" ]; then
+		nfs_opts="-o ${bootparam_nfsroot#*,}"
+	fi
+
+	location="${bootparam_nfsroot%%,*}"
+	if [ "${location#*:}" = "${location}" ]; then
+		# server-ip not given. Get server ip from ip option
+		server_ip=""
+		if [ "${bootparam_ip#*:}" != "${bootparam_ip}" ]; then
+			server_ip=$(echo "$bootparam_ip" | cut -d: -f2)
+		fi
+
+		if [ -z "$server_ip" ]; then
+			fatal "Server IP is not set. Update ip or nfsroot options."
+		fi
+		location=${server_ip}:${location}
+	fi
+
+	flags="-o nolock"
+	if [ -n "$bootparam_ro" ] && ! echo "$bootparam_rootflags" | grep -w -q "ro"; then
+		if [  -n "$bootparam_rootflags" ]; then
+			bootparam_rootflags="$bootparam_rootflags,"
+		fi
+		bootparam_rootflags="${bootparam_rootflags}ro"
+	fi
+	if [ -n "$bootparam_rootflags" ]; then
+		flags="$flags -o $bootparam_rootflags"
+	fi
+
+	mount -t nfs ${flags} ${nfs_opts} ${location} ${ROOTFS_DIR}
+}
+

meta/recipes-core/initrdscripts/initramfs-framework_1.0.bb

@@ -9,6 +9,7 @@ inherit allarch
 
 SRC_URI = "file://init \
            file://exec \
+           file://nfsrootfs \
            file://rootfs \
            file://finish \
            file://mdev \
@@ -24,6 +25,7 @@ do_install() {
 
     # base
     install -m 0755 ${WORKDIR}/init ${D}/init
+    install -m 0755 ${WORKDIR}/nfsrootfs ${D}/init.d/85-nfsrootfs
     install -m 0755 ${WORKDIR}/rootfs ${D}/init.d/90-rootfs
     install -m 0755 ${WORKDIR}/finish ${D}/init.d/99-finish
 
@@ -53,6 +55,7 @@ PACKAGES = "${PN}-base \
             initramfs-module-mdev \
             initramfs-module-udev \
             initramfs-module-e2fs \
+            initramfs-module-nfsrootfs \
             initramfs-module-rootfs \
             initramfs-module-debug \
            "
@@ -83,6 +86,10 @@ SUMMARY_initramfs-module-e2fs = "initramfs support for ext4/ext3/ext2 filesystem
 RDEPENDS_initramfs-module-e2fs = "${PN}-base"
 FILES_initramfs-module-e2fs = "/init.d/10-e2fs"
 
+SUMMARY_initramfs-module-nfsrootfs = "initramfs support for locating and mounting the root partition via nfs"
+RDEPENDS_initramfs-module-nfsrootfs = "${PN}-base"
+FILES_initramfs-module-nfsrootfs = "/init.d/85-nfsrootfs"
+
 SUMMARY_initramfs-module-rootfs = "initramfs support for locating and mounting the root partition"
 RDEPENDS_initramfs-module-rootfs = "${PN}-base"
 FILES_initramfs-module-rootfs = "/init.d/90-rootfs"