From 68ff2536e3a355248829c0f726f2a89ec7a2df93 Mon Sep 17 00:00:00 2001
From: Peder Bergebakken Sundt <pbsds@hotmail.com>
Date: Sun, 10 Dec 2023 06:03:49 +0100
Subject: [PATCH] meconium:  knut -> nox

---
 hosts/nord/default.nix           |  1 +
 hosts/noximilien/default.nix     |  3 +++
 hosts/sopp/default.nix           |  1 +
 profiles/mounts/common-zfs.nix   | 31 +++++++++++++++++++++++++++++++
 profiles/mounts/meconium-nfs.nix | 24 ++++++++++++++++++++++++
 profiles/mounts/meconium-zfs.nix | 11 +++++++++++
 profiles/mounts/reidun-nfs.nix   |  3 ---
 7 files changed, 71 insertions(+), 3 deletions(-)
 create mode 100644 profiles/mounts/common-zfs.nix
 create mode 100644 profiles/mounts/meconium-nfs.nix
 create mode 100644 profiles/mounts/meconium-zfs.nix

diff --git a/hosts/nord/default.nix b/hosts/nord/default.nix
index a3aac47..5420e61 100644
--- a/hosts/nord/default.nix
+++ b/hosts/nord/default.nix
@@ -24,6 +24,7 @@
     ../../users/pbsds
 
     ../../profiles/mounts/reidun-nfs.nix
+    ../../profiles/mounts/meconium-nfs.nix
 
     ../../profiles/shell/base.nix
     ../../profiles/shell/archives.nix
diff --git a/hosts/noximilien/default.nix b/hosts/noximilien/default.nix
index 612c497..6acbfb7 100644
--- a/hosts/noximilien/default.nix
+++ b/hosts/noximilien/default.nix
@@ -16,6 +16,7 @@
     ../../users/jornane
 
     ../../profiles/mounts/reidun-nfs.nix
+    ../../profiles/mounts/meconium-zfs.nix
 
     ../../profiles/shell/base.nix
     ../../profiles/shell/archives.nix
@@ -91,6 +92,8 @@
     "kuklef.se"
   ];
 
+  networking.hostId = "e1ffd469"; # needed for zfs: head -c 8 /etc/machine-id
+
   # TODO: remove? Move to where relevant?
   nixpkgs.overlays = [
     /** /
diff --git a/hosts/sopp/default.nix b/hosts/sopp/default.nix
index f5616ce..058c2cb 100644
--- a/hosts/sopp/default.nix
+++ b/hosts/sopp/default.nix
@@ -35,6 +35,7 @@
     ../../users/pbsds
 
     ../../profiles/mounts/reidun-nfs.nix
+    ../../profiles/mounts/meconium-nfs.nix
 
     ../../profiles/shell/base.nix
     ../../profiles/shell/archives.nix
diff --git a/profiles/mounts/common-zfs.nix b/profiles/mounts/common-zfs.nix
new file mode 100644
index 0000000..5b22f7a
--- /dev/null
+++ b/profiles/mounts/common-zfs.nix
@@ -0,0 +1,31 @@
+{ config, pkgs, lib, ... }:
+{
+  # https://openzfs.github.io/openzfs-docs/Getting%20Started/NixOS/index.html
+  # https://nixos.org/manual/nixos/stable/#sec-linux-zfs
+  # https://nixos.wiki/wiki/ZFS
+  # https://search.nixos.org/options?query=services.zfs
+
+  boot.kernelPackages = lib.mkForce pkgs.zfs.latestCompatibleLinuxPackages;
+  boot.supportedFilesystems = [ "zfs" ];
+  boot.zfs.forceImportRoot = false;
+
+  # must be set per host
+  #   head -c4 /dev/urandom | od -A none -t x4
+  # consider the one automatically generated by systemd:
+  #   head -c 8 /etc/machine-id
+  #networking.hostId = "12345678";
+
+  services.zfs.autoSnapshot.enable = true; # simply runs zfstools
+  # default args, can be overriden per-dataset
+  services.zfs.autoSnapshot.frequent = 2; # 15 min
+  services.zfs.autoSnapshot.hourly = 3;
+  services.zfs.autoSnapshot.daily = 4;
+  services.zfs.autoSnapshot.weekly = 3;
+  services.zfs.autoSnapshot.monthly = 5;
+
+  #services.zfs.autoReplication.enable
+  #services.zfs.autoScrub.enable = true;
+  #services.zfs.trim.enable = true;
+
+  # config.services.nfs.server.enable will automatically export NFS dataset tagged as such
+}
diff --git a/profiles/mounts/meconium-nfs.nix b/profiles/mounts/meconium-nfs.nix
new file mode 100644
index 0000000..b635186
--- /dev/null
+++ b/profiles/mounts/meconium-nfs.nix
@@ -0,0 +1,24 @@
+{ config, pkgs, lib, ... }:
+{
+  # TODO: wireguard
+  #boot.kernelParams = [ "nfs.nfs4_disable_idmapping=0" "nfsd.nfs4_disable_idmapping=0" ];
+
+  fileSystems = let
+    mkMount = mountpoint: server: subdir: {
+      "${mountpoint}${subdir}" = {
+        device = "${server}${subdir}";
+        fsType = "nfs";
+        #options = [ "nfsvers=4.2" ];
+      };
+    };
+    # TODO: combine nameValuePair and listToAttrs
+    joinSets = sets: builtins.foldl' (l: r: l // r) {} sets;
+  in joinSets (
+    # TODO: depend on nox.networking.interfaces.eno1.ipv4.addresses
+    (map (mkMount "/mnt/meconium" "192.168.1.9:/Meconium" ) [
+      ""
+      "/beets_music"
+    ])
+  );
+
+}
diff --git a/profiles/mounts/meconium-zfs.nix b/profiles/mounts/meconium-zfs.nix
new file mode 100644
index 0000000..68f8ae0
--- /dev/null
+++ b/profiles/mounts/meconium-zfs.nix
@@ -0,0 +1,11 @@
+{ config, pkgs, lib, ... }:
+{
+  # https://search.nixos.org/options?query=services.zfs
+
+  imports = [ ./common-zfs.nix ];
+
+  # non legacy-mount
+  systemd.services.zfs-mount.enable = true; # default
+  boot.zfs.extraPools = [ "Meconium" ]; # import on boot
+
+}
diff --git a/profiles/mounts/reidun-nfs.nix b/profiles/mounts/reidun-nfs.nix
index 6fa6a1b..6eed482 100644
--- a/profiles/mounts/reidun-nfs.nix
+++ b/profiles/mounts/reidun-nfs.nix
@@ -54,9 +54,6 @@
       "/Work/Programming"
       "/Work/School"
       "/pub"
-    ]) ++ (map (mkMount "/mnt/meconium" "192.168.1.3:/Meconium" ) [
-      ""
-      "/beets_music"
     ])
   );