Setup ollama API service

This superceedes exllama and tabbyAPI which I could never get working fully.
Unfortunately I had to switch to NixOS unstable to get all the Go builder stuff
to work, so this is a cause of yet another version drift, but I guess it's
inevitable and I should just learn to mitigate it with my nixpkgs shenanigans.

2 files changed, 49 insertions, 1 deletions

diff --git a/Biz/Dev/Beryllium.nix b/Biz/Dev/Beryllium.nix
index 607e5c1..cca0997 100644
--- a/Biz/Dev/Beryllium.nix
+++ b/Biz/Dev/Beryllium.nix
@@ -1,11 +1,12 @@
 { bild }:
-bild.os {
+bild.os-unstable {
   imports = [
     ../OsBase.nix
     ../Packages.nix
     ../Users.nix
     ./Beryllium/Configuration.nix
     ./Beryllium/Hardware.nix
+    ./Beryllium/Ollama.nix
     ./Vpn.nix
   ];
   networking.hostName = "beryllium";
diff --git a/Biz/Dev/Beryllium/Ollama.nix b/Biz/Dev/Beryllium/Ollama.nix
new file mode 100644
index 0000000..00aa327
--- /dev/null
+++ b/Biz/Dev/Beryllium/Ollama.nix
@@ -0,0 +1,47 @@
+{ pkgs, ... }:
+/* Ollama API service
+
+   Don't put too much work into this, there's a much better and more complete
+   ollama service (with webui!) being built here:
+   https://github.com/NixOS/nixpkgs/pull/275448
+
+   If you want to spend time on it, spend time over there.
+*/
+{
+
+  systemd.services.ollama = {
+    description = "ollama";
+    after = [ "network.target" ];
+    wantedBy = [ "multi-user.target" ];
+
+    environment = {
+      OLLAMA_HOST = "localhost:11434";
+      # Where to store LLM model files.
+      HOME = "%S/ollama";
+      OLLAMA_MODELS = "%S/ollama/models";
+      OLLAMA_DEBUG = "1";
+    };
+
+    serviceConfig = {
+      ExecStart = "${pkgs.ollama}/bin/ollama serve";
+      User = "ollama";
+      Group = "ollama";
+      Type = "simple";
+      Restart = "on-failure";
+      RestartSec = 3;
+      # Persistent storage for model files, i.e. /var/lib/<StateDirectory>
+      StateDirectory = [ "ollama" ];
+    };
+  };
+
+  # for administration, make this available to users' PATH
+  environment.systemPackages = [ pkgs.ollama ];
+
+  users.groups.ollama = { };
+
+  users.users.ollama = {
+    group = "ollama";
+    isSystemUser = true;
+    extraGroups = [ "render" "video" ];
+  };
+}