node inheritance + group parsing

nix/snow/flake/outputs/deploy.nix

@@ -1,57 +1,90 @@
-    deploy.nodes = mapNodes nodes ({
-      name,
-      node,
-      ...
-    }: let
-      inherit
-        (node.deploy)
-        ssh
-        user
-        interactiveSudo
-        remoteBuild
-        rollback
-        autoRollback
-        magicRollback
-        activationTimeout
-        confirmTimeout
-        ;
+{
+  _snow,
+  config,
+  ...
+}: let
+  inherit
+    (builtins)
+    mapAttrs
+    ;
 
-      nixosFor = system: inputs.deploy-rs.lib.${system}.activate.nixos;
-    in {
-      hostname =
-        if ssh.host != null
-        then ssh.host
-        else "";
+  mapNodes = nodes: f:
+    nodes.nodes
+    |> mapAttrs (name: node: let
+      # use per-node base or default to nodes' base
+      base =
+        if node.base != null
+        then node.base
+        else if nodes.base != null
+        then nodes.base
+        else
+          abort ''
+            snow cannot construct nodes node "${name}" without a base package source.
+            Ensure `nodes.nodes.*.base` or `nodes.base` is a flake reference to the github:NixOS/nixpkgs repository.
+          '';
+    in
+      f rec {
+        inherit name node base;
+        inherit (base) lib;
 
-      profilesOrder = ["default"]; # profiles priority
-      profiles.default = {
-        path = nixosFor node.system nixosConfigurations.${name};
+        groups = node.groups (parseGroupsDecl nodes.groups);
+        groupModules = root: getGroupModules root groups;
+      });
+in {
+  outputs.deploy.nodes = mapNodes config.nodes ({
+    name,
+    node,
+    ...
+  }: let
+    inherit
+      (node.deploy)
+      ssh
+      user
+      interactiveSudo
+      remoteBuild
+      rollback
+      autoRollback
+      magicRollback
+      activationTimeout
+      confirmTimeout
+      ;
 
-        user = user;
-        sudo = "sudo -u";
-        interactiveSudo = interactiveSudo;
+    nixosFor = system: _snow.inputs.deploy-rs.lib.${system}.activate.nixos;
+  in {
+    hostname =
+      if ssh.host != null
+      then ssh.host
+      else "";
 
-        fastConnection = false;
+    profilesOrder = ["default"]; # profiles priority
+    profiles.default = {
+      path = nixosFor node.system config.outputs.nixosConfigurations.${name};
 
-        autoRollback = autoRollback -> rollback;
-        magicRollback = magicRollback -> rollback;
-        activationTimeout = activationTimeout;
-        confirmTimeout = confirmTimeout;
+      user = user;
+      sudo = "sudo -u";
+      interactiveSudo = interactiveSudo;
 
-        remoteBuild = remoteBuild;
-        sshUser = ssh.user;
-        sshOpts =
-          ssh.opts
-          ++ (
-            if elem "-p" ssh.opts
-            then []
-            else ["-p" (toString ssh.port)]
-          )
-          ++ (
-            if elem "-A" ssh.opts
-            then []
-            else ["-A"]
-          );
-      };
-    });
+      fastConnection = false;
 
+      autoRollback = autoRollback -> rollback;
+      magicRollback = magicRollback -> rollback;
+      activationTimeout = activationTimeout;
+      confirmTimeout = confirmTimeout;
+
+      remoteBuild = remoteBuild;
+      sshUser = ssh.user;
+      sshOpts =
+        ssh.opts
+        ++ (
+          if builtins.elem "-p" ssh.opts
+          then []
+          else ["-p" (toString ssh.port)]
+        )
+        ++ (
+          if builtins.elem "-A" ssh.opts
+          then []
+          else ["-A"]
+        );
+    };
+  });
+}