diff --git a/nixos/modules/system/boot/luksroot.nix b/nixos/modules/system/boot/luksroot.nix
index 1079089bc5a8..018e7b2e7f89 100644
--- a/nixos/modules/system/boot/luksroot.nix
+++ b/nixos/modules/system/boot/luksroot.nix
@@ -7,19 +7,19 @@ let
 
   commonFunctions = ''
     die() {
-      echo "$@" >&2
-      exit 1
+        echo "$@" >&2
+        exit 1
     }
 
     dev_exist() {
-      local target="$1"
-      if [ -e $target ]; then
-        return 0
-      else
-        local uuid=$(echo -n $target | sed -e 's,UUID=\(.*\),\1,g')
-        local dev=$(blkid --uuid $uuid)
-        return $?
-      fi
+        local target="$1"
+        if [ -e $target ]; then
+            return 0
+        else
+            local uuid=$(echo -n $target | sed -e 's,UUID=\(.*\),\1,g')
+            blkid --uuid $uuid >/dev/null
+            return $?
+        fi
     }
 
     wait_target() {
@@ -51,30 +51,30 @@ let
     }
 
     wait_yubikey() {
-      local secs="''${1:-10}"
+        local secs="''${1:-10}"
 
-      ykinfo -v 1>/dev/null 2>&1
-      if [ $? != 0 ]; then
-          echo -n "Waiting $secs seconds for Yubikey to appear..."
-          local success=false
-          for try in $(seq $secs); do
-              echo -n .
-              sleep 1
-              ykinfo -v 1>/dev/null 2>&1
-              if [ $? == 0 ]; then
-                  success=true
-                  break
-              fi
-          done
-          if [ $success == true ]; then
-              echo " - success";
-              return 0
-          else
-              echo " - failure";
-              return 1
-          fi
-      fi
-      return 0
+        ykinfo -v 1>/dev/null 2>&1
+        if [ $? != 0 ]; then
+            echo -n "Waiting $secs seconds for Yubikey to appear..."
+            local success=false
+            for try in $(seq $secs); do
+                echo -n .
+                sleep 1
+                ykinfo -v 1>/dev/null 2>&1
+                if [ $? == 0 ]; then
+                    success=true
+                    break
+                fi
+            done
+            if [ $success == true ]; then
+                echo " - success";
+                return 0
+            else
+                echo " - failure";
+                return 1
+            fi
+        fi
+        return 0
     }
   '';