nixos/…/swap.nix: remove backslashes from deviceName

Fixes #8277

Prior to this, backslashes would end up in fstab and the swap partition
was not activated.  Swap files seemed to work fine.

1 files changed, 5 insertions, 1 deletions

diff --git a/nixos/modules/config/swap.nix b/nixos/modules/config/swap.nix
index 62b6e011713e..968bb22f354c 100644
--- a/nixos/modules/config/swap.nix
+++ b/nixos/modules/config/swap.nix
@@ -54,6 +54,10 @@ let
           WARNING: Don't try to hibernate when you have at least one swap partition with
           this option enabled! We have no way to set the partition into which hibernation image
           is saved, so if your image ends up on an encrypted one you would lose it!
+
+          WARNING #2: Do not use /dev/disk/by-uuid/… or /dev/disk/by-label/… as your swap device
+          when using randomEncryption as the UUIDs and labels will get erased on every boot when
+          the partition is encrypted. Best to use /dev/disk/by-partuuid/…
         '';
       };
 
@@ -72,7 +76,7 @@ let
     config = rec {
       device = mkIf options.label.isDefined
         "/dev/disk/by-label/${config.label}";
-      deviceName = escapeSystemdPath config.device;
+      deviceName = lib.replaceChars ["\\"] [""] (escapeSystemdPath config.device);
       realDevice = if config.randomEncryption then "/dev/mapper/${deviceName}" else config.device;
     };