migrating config

This deploy logic is primarily based on hxchn's deploy lib [1], with some
slight modifications to make it work with my setup. Everything seems to work
fine for now.

However, I am unsure about the usage of niv — the config doesn't seem to gain
much from it, apart from (some) additional complexity.

[1] https://gitlab.com/hexchen/nixfiles

1 files changed, 80 insertions, 0 deletions

diff --git a/lib/hosts.nix b/lib/hosts.nix
new file mode 100644
index 0000000..91b6b40
--- /dev/null
+++ b/lib/hosts.nix
@@ -0,0 +1,80 @@
+{
+  pkgs,
+  hostsDir ? ../hosts,
+  commonImports ? [],
+  pkgsPath ? ../pkgs,
+  modules ? {},
+  overlays ? {},
+  profiles ? {},
+  users ? {},
+  sources ? {}
+}:
+
+with pkgs.lib;
+
+rec {
+  hostNames = attrNames (
+    filterAttrs (
+      name: type: type == "directory"
+    ) (
+      builtins.readDir hostsDir
+    )
+  );
+
+  hostConfig = hostName: { config, ... }: {
+    _module.args = {
+      inherit hosts groups;
+    };
+    imports = [
+      (import (hostsDir + "/${hostName}/configuration.nix"))
+      # urgh, yes, we still need to manually import the deploy module for now
+      # at least if i want to keep my thing reusable.
+      ../modules/deploy
+    ] ++ commonImports;
+    networking = {
+      inherit hostName;
+    };
+    nixpkgs.pkgs =
+      let pkgs = import pkgsPath {
+        inherit (config.nixpkgs) config system;
+      };
+      in if pkgs ? nixpkgs then pkgs.nixpkgs else pkgs;
+  };
+
+  hosts = listToAttrs (
+    map (
+      hostName: nameValuePair hostName (
+        import (pkgs.path + "/nixos/lib/eval-config.nix") {
+          modules = [
+            (hostConfig hostName)
+            (if sources ? home-manager then sources.home-manager + "/nixos" else {})
+          ];
+          specialArgs = { inherit modules overlays profiles users sources; };
+        }
+      )
+    ) hostNames
+  );
+
+  groupNames = unique (
+    concatLists (
+      mapAttrsToList (
+        name: host: host.config.hexchen.deploy.groups
+      ) hosts
+    )
+  );
+
+  groups = listToAttrs (
+    map (
+      groupName: nameValuePair groupName (
+        filter (
+          host: elem groupName host.config.hexchen.deploy.groups
+        ) (
+          attrValues (
+            filterAttrs (_: h: h.config.hexchen.deploy.enable) hosts
+          )
+        )
+      )
+    ) groupNames
+  );
+}
+