From 6ee8509d990bd0672ec06074d6ccfbfacb2897f3 Mon Sep 17 00:00:00 2001
From: Root <root@fudo.org>
Date: Mon, 12 Apr 2021 13:41:00 -0700
Subject: [PATCH] Don't use tmpfs for small-mem hosts

---
 config/hosts/limina.nix          |  1 +
 config/hosts/plato.nix           |  1 +
 config/profile-config/server.nix | 12 ++----------
 lib/fudo/hosts.nix               |  9 +++++++++
 4 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/config/hosts/limina.nix b/config/hosts/limina.nix
index 04fb8f6..a85eb41 100644
--- a/config/hosts/limina.nix
+++ b/config/hosts/limina.nix
@@ -13,4 +13,5 @@
   profile = "server";
   ssh-pubkey =
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMqymGZ5dI6ChI1Qx1QfjBo/h0+xFwpRx/wQSDxWQprI";
+  tmp-on-tmpfs = false;
 }
diff --git a/config/hosts/plato.nix b/config/hosts/plato.nix
index 8fa9a6c..16187c2 100644
--- a/config/hosts/plato.nix
+++ b/config/hosts/plato.nix
@@ -16,4 +16,5 @@
   build-pubkeys = [
     "ssh-rsa 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"
   ];
+  tmp-on-tmpfs = false;
 }
diff --git a/config/profile-config/server.nix b/config/profile-config/server.nix
index 1b0b130..9cc8bf0 100644
--- a/config/profile-config/server.nix
+++ b/config/profile-config/server.nix
@@ -2,11 +2,7 @@
 
 with lib;
 let
-  serverPackages = with pkgs; [
-    emacs-nox
-    reboot-if-necessary
-    test-config
-  ];
+  serverPackages = with pkgs; [ emacs-nox reboot-if-necessary test-config ];
 
   reboot-if-necessary = pkgs.writeShellScriptBin "reboot-if-necessary" ''
     if [ $# -ne 1 ]; then
@@ -50,9 +46,7 @@ in {
   imports = [ ./common.nix ];
 
   config = {
-    environment = {
-      systemPackages = serverPackages;
-    };
+    environment = { systemPackages = serverPackages; };
 
     system.autoUpgrade.enable = false;
 
@@ -60,8 +54,6 @@ in {
 
     networking.networkmanager.enable = mkForce false;
 
-    boot.tmpOnTmpfs = true;
-
     services = {
       xserver.enable = false;
 
diff --git a/lib/fudo/hosts.nix b/lib/fudo/hosts.nix
index b0993c8..b772b68 100644
--- a/lib/fudo/hosts.nix
+++ b/lib/fudo/hosts.nix
@@ -89,6 +89,13 @@ let
         default = null;
       };
 
+      tmp-on-tmpfs = mkOption {
+        type = bool;
+        description =
+          "Use tmpfs for /tmp. Great if you've got enough (>16G) RAM.";
+        default = true;
+      };
+
       enable-gui = mkEnableOption "Install desktop GUI software.";
 
       docker-server = mkEnableOption "Enable Docker on the current host.";
@@ -172,6 +179,8 @@ in {
       autoPrune.enable = true;
     };
 
+    boot.tmpOnTmpfs = host-cfg.tmp-on-tmpfs;
+
     programs.ssh.knownHosts = let
       keyed-hosts =
         filterAttrs (host: opts: opts.ssh-pubkey != null) config.fudo.hosts;