init-readonly-rootfs-overlay-boot: wait for device to show up

Some devices such as external MMCs could be probed after the init
process has started. Wait at most 5s for root and roroot to be available.

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/recipes-core/initrdscripts/files/init-readonly-rootfs-overlay-boot.sh b/recipes-core/initrdscripts/files/init-readonly-rootfs-overlay-boot.sh
index 66f0cdc..b990344 100644
--- a/recipes-core/initrdscripts/files/init-readonly-rootfs-overlay-boot.sh
+++ b/recipes-core/initrdscripts/files/init-readonly-rootfs-overlay-boot.sh
@@ -77,6 +77,18 @@ log() {
         echo "rorootfs-overlay: $1" >$CONSOLE
 }
 
+wait_for_device() {
+    counter=0
+    while [ ! -b $1 ]; do
+        sleep .100
+        counter=$((counter + 1))
+        if [ $counter -ge 50 ]; then
+            fatal "$1 is not availble"
+            exit
+        fi
+    done
+}
+
 early_setup
 
 [ -z "${CONSOLE+x}" ] && CONSOLE="/dev/console"
@@ -89,6 +101,7 @@ mount_and_boot() {
         # Build mount options for read only root file system.
         # If no read-only device was specified via kernel command line, use
         # current root file system via bind mount.
+    wait_for_device ${ROOT_RODEVICE}
         ROOT_ROMOUNTPARAMS_BIND="-o ${ROOT_ROMOUNTOPTIONS} /"
         if [ -n "${ROOT_RODEVICE}" ]; then
                 ROOT_ROMOUNTPARAMS="-o ${ROOT_ROMOUNTOPTIONS_DEVICE} $ROOT_RODEVICE"
@@ -123,6 +136,7 @@ mount_and_boot() {
         # Build mount options for read write root file system.
         # If a read-write device was specified via kernel command line, use
         # it, otherwise default to tmpfs.
+    wait_for_device ${ROOT_RWDEVICE}
         if [ -n "${ROOT_RWDEVICE}" ]; then
                 
                 ROOT_RWMOUNTPARAMS="-o $ROOT_RWMOUNTOPTIONS_DEVICE $ROOT_RWDEVICE"