nixos/tmp: Fix format of /tmp mount options

The mount options need to be passed as a comma-separated list of options so that they
end up one a single Options line in the resulting mount unit.
The current code passed the options as a list, resulting in several Options lines in
the mount unit, all but the first of these were ignored by systemd however.
This behaviour is not clearly defined in the systemd man page.

1 files changed, 6 insertions, 1 deletions

diff --git a/nixos/modules/system/boot/tmp.nix b/nixos/modules/system/boot/tmp.nix
index 6edafd6695b..cf6d19eb5f0 100644
--- a/nixos/modules/system/boot/tmp.nix
+++ b/nixos/modules/system/boot/tmp.nix
@@ -48,7 +48,12 @@ in
         what = "tmpfs";
         where = "/tmp";
         type = "tmpfs";
-        mountConfig.Options = [ "mode=1777" "strictatime" "rw" "nosuid" "nodev" "size=${toString cfg.tmpOnTmpfsSize}" ];
+        mountConfig.Options = concatStringsSep "," [ "mode=1777"
+                                                     "strictatime"
+                                                     "rw"
+                                                     "nosuid"
+                                                     "nodev"
+                                                     "size=${toString cfg.tmpOnTmpfsSize}" ];
       }
     ];