First, $host_fs_types is an array.
Second, use strstr to match btrfs type.

Cc: Harald Hoyer <[email protected]>
Signed-off-by: WANG Cong <[email protected]>

---
diff --git a/modules.d/90btrfs/module-setup.sh 
b/modules.d/90btrfs/module-setup.sh
index a141dda..135abc6 100755
--- a/modules.d/90btrfs/module-setup.sh
+++ b/modules.d/90btrfs/module-setup.sh
@@ -13,8 +13,8 @@ check() {
 
     [[ $hostonly ]] || [[ $mount_needs ]] && {
         local _found
-        for fs in $host_fs_types; do
-            [[ "$fs" = "|btrfs" ]] && _found="1"
+        for fs in ${host_fs_types[@]}; do
+            strstr "$fs" "\|btrfs" && _found="1"
         done
         [[ $_found ]] || return 1
         unset _found
--
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