1 files changed, 18 insertions, 11 deletions

diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh
index 861d874657..df0076dd84 100644
--- a/meta/recipes-core/initrdscripts/files/init-live.sh
+++ b/meta/recipes-core/initrdscripts/files/init-live.sh
@@ -137,12 +137,23 @@ do
   sleep 1
 done
 
-# Try to make a union mount of the root image.
-# If no unification filesystem is available, mount the image read-only.
+# Try to mount the root image read-write and then boot it up.
+# This function distinguishes between a read-only image and a read-write image.
+# In the former case (typically an iso), it tries to make a union mount if possible.
+# In the latter case, the root image could be mounted and then directly booted up.
 mount_and_boot() {
     mkdir $ROOT_MOUNT
     mknod /dev/loop0 b 7 0 2>/dev/null
 
+    if ! mount -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
+        fatal "Could not mount rootfs image"
+    fi
+
+    if touch $ROOT_MOUNT/bin 2>/dev/null; then
+        # The root image is read-write, directly boot it up.
+        boot_live_root
+    fi
+
     # determine which unification filesystem to use
     union_fs_type=""
     if grep -q -w "overlayfs" /proc/filesystems; then
@@ -157,9 +168,9 @@ mount_and_boot() {
     case $union_fs_type in
         "overlayfs")
             mkdir -p /rootfs.ro /rootfs.rw
-            if ! mount -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs.ro; then
+            if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
                 rm -rf /rootfs.ro /rootfs.rw
-                fatal "Could not mount rootfs image"
+                fatal "Could not move rootfs mount point"
             else
                 mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
                 mount -t overlayfs -o "lowerdir=/rootfs.ro,upperdir=/rootfs.rw" overlayfs $ROOT_MOUNT
@@ -170,9 +181,9 @@ mount_and_boot() {
             ;;
         "aufs")
             mkdir -p /rootfs.ro /rootfs.rw
-            if ! mount -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs.ro; then
+            if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
                 rm -rf /rootfs.ro /rootfs.rw
-                fatal "Could not mount rootfs image"
+                fatal "Could not move rootfs mount point"
             else
                 mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
                 mount -t aufs -o "dirs=/rootfs.rw=rw:/rootfs.ro=ro" aufs $ROOT_MOUNT
@@ -182,11 +193,7 @@ mount_and_boot() {
             fi
             ;;
         "")
-            if ! mount -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
-                fatal "Could not mount rootfs image"
-            else
-                mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media
-            fi
+            mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media
             ;;
     esac