flake.nix

@@ -69,6 +69,7 @@
 
         devShells.default = pkgs.mkShell {
           buildInputs = [
+            pkgs.deploy-rs
             pkgs.nixpkgs-fmt
             pkgs.agenix
             pkgs.ssh-to-age
@@ -141,19 +142,26 @@
           ];
         };
 
-        deploy.nodes = {
-          droppie.profiles.system = {
-            hostname = "backup.b12f.io";
-            sshUser = "yule";
-            path = inputs.deploy-rs.lib.x86_64-linux.activate.nixos self.nixosConfigurations.droppie;
+        deploy.nodes = self.b12f.lib.deploy.mkDeployNodes self.nixosConfigurations {
+          chocolatebar = {
+            sshUser = "b12f";
           };
 
-          pie.profiles.system = {
+          biolimo = {
+            sshUser = "b12f";
+          };
+
+          droppie = {
+            hostname = "backup.b12f.io";
+            sshUser = "yule";
+          };
+
+          pie = {
             hostname = "pie.local";
             sshUser = "yule";
           };
 
-          maoam.profiles.system = {
+          maoam = {
             sshUser = "b12f";
           };
         };

lib/default.nix

@@ -1,10 +1,16 @@
-{lib}:
-lib.makeExtensible (self: let
-  callLibs = file: import file {lib = self;};
+{ lib, inputs, ... }: {
+  # Configuration common to all Linux systems
+  flake = {
+    b12f.lib = let
+      callLibs = file: import file {inherit lib;};
     in rec {
       ## Define your own library functions here!
       #id = x: x;
       ## Or in files, containing functions that take {lib}
       #foo = callLibs ./foo.nix;
       ## In configs, they can be used under "lib.our"
-})
+
+      deploy = import ./deploy.nix { inherit inputs lib; };
+    };
+  };
+}

lib/deploy.nix

@@ -0,0 +1,62 @@
+/*
+ * The contents of this file are adapted from digga
+ * https://github.com/divnix/digga
+ *
+ * Licensed under the MIT license
+ */
+
+{ lib, inputs }: let
+  getFqdn = c: let
+    net = c.config.networking;
+    fqdn =
+      if (net ? domain) && (net.domain != null)
+      then "${net.hostName}.${net.domain}"
+      else net.hostName;
+  in
+    fqdn;
+in {
+  mkDeployNodes = systemConfigurations: extraConfig:
+  /*
+   *
+   Synopsis: mkNodes _systemConfigurations_ _extraConfig_
+
+   Generate the `nodes` attribute expected by deploy-rs
+   where _systemConfigurations_ are `nodes`.
+
+   _systemConfigurations_ should take the form of a flake's
+   _nixosConfigurations_. Note that deploy-rs does not currently support
+   deploying to darwin hosts.
+
+   _extraConfig_, if specified, will be merged into each of the
+   nodes' configurations.
+
+   Example _systemConfigurations_ input:
+
+   ```
+   {
+   hostname-1 = {
+   fastConnection = true;
+   sshOpts = [ "-p" "25" ];
+   };
+   hostname-2 = {
+   sshOpts = [ "-p" "19999" ];
+   sshUser = "root";
+   };
+   }
+   ```
+   *
+   */
+    lib.recursiveUpdate
+    (lib.mapAttrs
+      (
+        _: c: {
+          hostname = getFqdn c;
+          profiles.system = {
+            user = "root";
+            path = inputs.deploy-rs.lib.${c.pkgs.stdenv.hostPlatform.system}.activate.nixos c;
+          };
+        }
+      )
+      systemConfigurations)
+    extraConfig;
+}