nixos/tmp: Make /tmp on ramdisk usable again

@poettering decided we only need a limited number of inodes in our /tmp,
so why not limit that for every systemd user? That makes medium-sized nix
builds impossible so this commit restores the old behaviour which is the
kernel default of half the number of physical RAM pages which does not
seem too unreasonable to me.

1 files changed, 7 insertions, 1 deletions

diff --git a/nixos/modules/system/boot/tmp.nix b/nixos/modules/system/boot/tmp.nix
index 26eb172210e..837e308cbea 100644
--- a/nixos/modules/system/boot/tmp.nix
+++ b/nixos/modules/system/boot/tmp.nix
@@ -30,7 +30,13 @@ with lib;
 
   config = {
 
-    systemd.additionalUpstreamSystemUnits = optional config.boot.tmpOnTmpfs "tmp.mount";
+    systemd.mounts = mkIf config.boot.tmpOnTmpfs [
+      {
+        what = "tmpfs";
+        where = "/tmp";
+        mountConfig.Options = [ "mode=1777" "strictatime" "rw" "nosuid" "nodev" "size=50%" ];
+      }
+    ];
 
     systemd.tmpfiles.rules = optional config.boot.cleanTmpDir "D! /tmp 1777 root root";