Support 'read-only-rootfs' IMAGE_FEATURES for systemd based systems

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@@ -0,0 +1,17 @@
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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+#!/bin/sh
+#
+# Perform a bind mount, copying existing files as we do so to ensure the
+# overlaid path has the necessary content.
+
+if [ $# -lt 2 ]; then
+    echo >&2 "Usage: $0 spec mountpoint [OPTIONS]"
+    exit 1
+fi
+
+spec=$1
+mountpoint=$2
+
+if [ $# -gt 2 ]; then
+    options=$3
+else
+    options=
+fi
+
+[ -n "$options" ] && options=",$options"
+
+mkdir -p "${spec%/*}"
+if [ -d "$mountpoint" ]; then
+    if [ ! -d "$spec" ]; then
+        mkdir "$spec"
+        cp -pPR "$mountpoint"/. "$spec/"
+    fi
+elif [ -f "$mountpoint" ]; then
+    if [ ! -f "$spec" ]; then
+        cp -pP "$mountpoint" "$spec"
+    fi
+fi
+
+mount -o "bind$options" "$spec" "$mountpoint"

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+[Unit]
+Description=Bind mount volatile @where@
+DefaultDependencies=false
+Before=local-fs.target
+RequiresMountsFor=@whatparent@ @whereparent@
+ConditionPathIsReadWrite=@whatparent@
+ConditionPathExists=@where@
+ConditionPathIsReadWrite=!@where@
+
+[Service]
+Type=oneshot
+RemainAfterExit=Yes
+StandardOutput=syslog
+TimeoutSec=0
+ExecStart=/sbin/mount-copybind @what@ @where@
+ExecStop=/sbin/umount @where@
+
+[Install]
+WantedBy=local-fs.target

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index 5de7cdc..4fb7ffc 100644
@@ -243,6 +243,7 @@ FILES_${PN}-dbg += "${rootlibdir}/.debug ${systemd_unitdir}/.debug ${systemd_uni
 FILES_${PN}-dev += "${base_libdir}/security/*.la ${datadir}/dbus-1/interfaces/ ${sysconfdir}/rpm/macros.systemd"
 
 RDEPENDS_${PN} += "kmod dbus util-linux-mount udev (= ${EXTENDPKGV})"
+RDEPENDS_${PN} += "volatile-binds"
 
 RRECOMMENDS_${PN} += "systemd-serialgetty systemd-compat-units udev-hwdb\
                       util-linux-agetty \

index da13bb8..82605f2 100644
@@ -199,9 +199,10 @@ do_rootfs[umask] = "022"
 # A hook function to support read-only-rootfs IMAGE_FEATURES
 # Currently, it only supports sysvinit system.
 read_only_rootfs_hook () {
+	# Tweak the mount option and fs_passno for rootfs in fstab
+	sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
+
 	if ${@bb.utils.contains("DISTRO_FEATURES", "sysvinit", "true", "false", d)}; then
-	        # Tweak the mount option and fs_passno for rootfs in fstab
-		sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
 	        # Change the value of ROOTFS_READ_ONLY in /etc/default/rcS to yes
 		if [ -e ${IMAGE_ROOTFS}/etc/default/rcS ]; then
 			sed -i 's/ROOTFS_READ_ONLY=no/ROOTFS_READ_ONLY=yes/' ${IMAGE_ROOTFS}/etc/default/rcS