Sync filesystem changes before checking partition exists (#186)

scripts/umbrel-os/external-storage/mount

@@ -37,6 +37,9 @@ check_dependencies () {
 
 # Returns a list of block device paths
 list_block_devices () {
+  # We need to run sync here to make sure the filesystem is reflecting the
+  # the latest changes in /sys/block/sd*
+  sync
   # We use "2>/dev/null || true" to swallow errors if there are
   # no block devices. In that case the function just returns nothing
   # instead of an error which is what we want.
@@ -58,6 +61,9 @@ get_block_device_model () {
 
 is_partition_ext4 () {
   partition_path="${1}"
+  # We need to run sync here to make sure the filesystem is reflecting the
+  # the latest changes in /dev/*
+  sync
   blkid -o value -s TYPE "${partition_path}" | grep --quiet '^ext4$'
 }