dd-multi.sh: wait for new partitions

There is a latency between when partprobe is called and when udev
actually creates the device nodes. Wait for the desired device
nodes to appear before continuing.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

1 files changed, 8 insertions, 1 deletions

diff --git a/lx-trainer-vm/dd-multi.sh b/lx-trainer-vm/dd-multi.sh
index 2049be8..2408a66 100755
--- a/lx-trainer-vm/dd-multi.sh
+++ b/lx-trainer-vm/dd-multi.sh
@@ -73,11 +73,18 @@ partprobe $DESTS
 for dest in $DESTS; do
 	/bin/echo -e "n\np\n\n\n\nw" | fdisk $dest
 done
-sync
 
 # rescan devices
 partprobe $DESTS
 
+# wait for partitions to appear
+for dest in $DESTS; do
+	while [ ! -b ${dest}2 ]; do
+		echo "waiting for ${dest}2..."
+		sleep 1
+	done
+done
+
 # create ext4 on 2nd partition
 for dest in $DESTS; do
 	mkfs.ext4 -L lxhome ${dest}2 &