Create a bootstrap image for Digital Ocean droplets

I need a way to reliably get a NixOS VM provisioned in the cloud, and the
easiest way to do this is to create a qcow2 image, upload it to Digital Ocean,
and use that to start a droplet. This is very much a manual process, but that's
fine, I shouldn't need to do it very often (for now).

8 files changed, 43 insertions, 15 deletions

diff --git a/Omni/Bild.hs b/Omni/Bild.hs
index 659619b..2d3d729 100644
--- a/Omni/Bild.hs
+++ b/Omni/Bild.hs
@@ -464,6 +464,7 @@ isBuildableNs = \case
         ["Omni", "Dev"],
         ["Omni", "Dev", "Lithium"],
         ["Omni", "Dev", "Beryllium"],
+        ["Omni", "Os", "Boot"],
         ["Biz", "Dragons", "Analysis"]
       ]
 
diff --git a/Omni/Bild.nix b/Omni/Bild.nix
index 90fa979..a7c4e32 100644
--- a/Omni/Bild.nix
+++ b/Omni/Bild.nix
@@ -240,6 +240,15 @@ let
     # build an operating system. 'cfg' is the NixOS config
     os = cfg: (stable.nixos (_args: cfg)).toplevel;
 
+    # build an os image for a digital ocean droplet
+    droplet = cfg:
+      (stable.nixos ({ modulesPath, ... }: {
+        imports = [
+          "${toString modulesPath}/virtualisation/digital-ocean-image.nix"
+          (_args: cfg)
+        ];
+      })).digitalOceanImage;
+
     # build a docker image
     image = stable.dockerTools.buildImage;
   };
diff --git a/Omni/Cloud.nix b/Omni/Cloud.nix
index 2ec801f..5111373 100644
--- a/Omni/Cloud.nix
+++ b/Omni/Cloud.nix
@@ -3,7 +3,7 @@
 
 bild.os {
   imports = [
-    ./OsBase.nix
+    ./Os/Base.nix
     ./Packages.nix
     ./Users.nix
     ./Cloud/Chat.nix
diff --git a/Omni/Dev/Beryllium.nix b/Omni/Dev/Beryllium.nix
index 82374c3..b9fe363 100644
--- a/Omni/Dev/Beryllium.nix
+++ b/Omni/Dev/Beryllium.nix
@@ -1,7 +1,7 @@
 { bild }:
 bild.os {
   imports = [
-    ../OsBase.nix
+    ../Os/Base.nix
     ../Packages.nix
     ../Users.nix
     ./Beryllium/Configuration.nix
diff --git a/Omni/Dev/Lithium.nix b/Omni/Dev/Lithium.nix
index 1716d51..9eb8304 100644
--- a/Omni/Dev/Lithium.nix
+++ b/Omni/Dev/Lithium.nix
@@ -3,7 +3,7 @@
 
 bild.os {
   imports = [
-    ../OsBase.nix
+    ../Os/Base.nix
     ../Packages.nix
     ../Users.nix
     ./Lithium/Configuration.nix
diff --git a/Omni/OsBase.nix b/Omni/Os/Base.nix
index 3e69d8e..8e301e1 100644
--- a/Omni/OsBase.nix
+++ b/Omni/Os/Base.nix
@@ -1,17 +1,10 @@
-{ pkgs, config, ... }:
-let ports = import ./Cloud/Ports.nix;
+{ config, ... }:
+
+# This module defines common default settings that all OS builds should include.
+
+let ports = import ../Cloud/Ports.nix;
 in {
   boot.tmp.cleanOnBoot = true;
-  fonts.fonts = with pkgs; [
-    google-fonts
-    mononoki
-    source-code-pro
-    fantasque-sans-mono
-    hack-font
-    fira
-    fira-code
-    fira-code-symbols
-  ];
   networking.firewall.allowPing = true;
   nix.settings.substituters =
     [ "https://cache.nixos.org" ]; # "ssh://dev.simatime.com" ];
diff --git a/Omni/Os/Boot.nix b/Omni/Os/Boot.nix
new file mode 100644
index 0000000..c789d89
--- /dev/null
+++ b/Omni/Os/Boot.nix
@@ -0,0 +1,14 @@
+{ bild }:
+/* This target creates a qcow2 image of a barebones NixOS VM which should be used
+   to bootstrap a deployment target.
+
+   The workflow is like this:
+
+   - bild this, you get a qcow2 image
+   - go to https://cloud.digitalocean.com/images/custom_images
+   - upload the image
+   - start a new droplet with this image
+   - once fully provisioned and accessible via ssh, the new droplet can be a deploy
+     target for any other namespace
+*/
+bild.droplet { imports = [ ./Base.nix ../Users.nix ]; }
diff --git a/Omni/Packages.nix b/Omni/Packages.nix
index d04dfc3..66c1983 100644
--- a/Omni/Packages.nix
+++ b/Omni/Packages.nix
@@ -5,6 +5,17 @@
 with pkgs;
 
 {
+  fonts.fonts = with pkgs; [
+    google-fonts
+    mononoki
+    source-code-pro
+    fantasque-sans-mono
+    hack-font
+    fira
+    fira-code
+    fira-code-symbols
+  ];
+
   environment.systemPackages = [
     file
     fd