agl-basesystem

1 files changed, 43 insertions, 0 deletions

diff --git a/external/poky/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh b/external/poky/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh
new file mode 100644
index 00000000..bd445ddb
--- /dev/null
+++ b/external/poky/meta/recipes-core/initscripts/initscripts-1.0/read-only-rootfs-hook.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+. /etc/default/rcS
+
+[ "$ROOTFS_READ_ONLY" = "no" ] && exit 0
+
+is_on_read_only_partition () {
+	DIRECTORY=$1
+	dir=`readlink -f $DIRECTORY`
+	while true; do
+		if [ ! -d "$dir" ]; then
+			echo "ERROR: $dir is not a directory"
+			exit 1
+		else
+			for flag in `awk -v dir=$dir '{ if ($2 == dir) { print "FOUND"; split($4,FLAGS,",") } }; \
+				END { for (f in FLAGS) print FLAGS[f] }' < /proc/mounts`; do
+				[ "$flag" = "FOUND" ] && partition="read-write"
+				[ "$flag" = "ro" ] && { partition="read-only"; break; }
+			done
+			if [ "$dir" = "/" -o -n "$partition" ]; then
+				break
+			else
+				dir=`dirname $dir`
+			fi
+		fi
+	done
+	[ "$partition" = "read-only" ] && echo "yes" || echo "no"
+}
+
+if [ "$1" = "start" ] ; then
+	if [ `is_on_read_only_partition /var/lib` = "yes" ]; then
+		grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile
+		mkdir -p /var/volatile/lib
+		mkdir -p /var/volatile/.lib-work
+		# Try to mount using overlay, which is much faster than copying
+		# files. If that fails, fallback to the slower copy
+		if ! mount -t overlay overlay -olowerdir=/var/lib,upperdir=/var/volatile/lib,workdir=/var/volatile/.lib-work /var/lib > /dev/null 2>&1; then
+			cp -a /var/lib/* /var/volatile/lib
+			mount --bind /var/volatile/lib /var/lib
+		fi
+	fi
+fi
+