zapCreateMount: stop mdraids

module.nix

@@ -46,7 +46,7 @@ in {
       ${types.diskoLib.mount cfg.devices}
     '';
 
-    system.build.disko = pkgs.writers.writeDash "disko" ''
+    system.build.disko = pkgs.writers.writeBash "disko" ''
       export PATH=${lib.makeBinPath (types.diskoLib.packages cfg.devices pkgs)}
       ${types.diskoLib.zapCreateMount cfg.devices}
     '';

types.nix

@@ -152,6 +152,7 @@ rec {
     */
     zapCreateMount = devices: ''
       set -efux
+      shopt -s nullglob
       # print existing disks
       lsblk
 
@@ -161,6 +162,12 @@ rec {
         umount -Rlv /mnt
       fi
 
+      # stop all existing raids
+      for r in /dev/md/* /dev/md[0-9]*; do
+        # might fail if the device was already closed in the loop
+        mdadm --stop "$r" || true
+      done
+
       echo 'creating partitions...'
       ${diskoLib.create devices}
       echo 'mounting partitions...'