ctucx.git: dns.nix

Switch to flake-first and fix writeZone in flakes

This is a big change that changes the repository from default.nix-first
and a flake.nix that imports it to flake-first and flake-compat.

Additionally, this fixes `writeZone` in flakes-mode by moving it from
`lib` to `util.<system>`, since it uses `writeTextFile`, which requires
`stdenv`.

diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ Example of a zone
 ```nix
 # dns = import path/to/nix-dns;
 
-with dns.combinators; {
+with dns.lib.combinators; {
   SOA = {  # Human readable names for fields
     nameServer = "ns.test.com.";
     adminEmail = "admin@test.com";  # Email address with a real `@`!

@@ -102,14 +102,16 @@ Add it as an input to your flake:
   };
 
   outputs = { self, nixpkgs, dns }: {
-    # All functions from `nix-dns` are available in `dns.lib`.
+    # Most functions from `nix-dns` are available in `dns.lib`.
+    # Functions that require `stdenv` (e.g. `writeZone`) are in
+    # `dns.util.<system>`.
     # ...
   };
 }
 ```
 
-All examples below assume the old way of importing, but they should work with
-just one change: replace `dns` with `dns.lib` everywhere.
+All examples below assume the old way of importing, but they should work
+without any changes.
 
 #### Importing directly (old way)
 

@@ -153,7 +155,7 @@ services.nsd = {
       "example.com" = {
         # provideXFR = [ ... ];
         # notify = [ ... ];
-        data = dns.toString "example.com" (import ./dns/example.com { inherit dns; });
+        data = dns.lib.toString "example.com" (import ./dns/example.com { inherit dns; });
       };
     };
 };

@@ -166,7 +168,7 @@ services.nsd = {
 
 { dns }:
 
-with dns.combinators;
+with dns.lib.combinators;
 
 {
   SOA = {

@@ -199,7 +201,7 @@ types to be used in the NixOS module system. Using them you can define
 an option in your module such as this one:
 
 ```nix
-# dns = import path/to/nix-dns/dns { inherit pkgs; };
+# dns = import path/to/nix-dns/dns { inherit lib; };
 
 {
 

diff --git a/default.nix b/default.nix
@@ -1,21 +1,11 @@
-# SPDX-FileCopyrightText: 2019 Kirill Elagin <kirelagin@gmail.com>
+# SPDX-FileCopyrightText: 2021 Kirill Elagin <https://kir.elagin.me/>
 #
-# SPDX-License-Identifier: MIT
-
-{ pkgs ? import <nixpkgs> {} }:
-
-let
-  dns = import ./dns { inherit (pkgs) lib; };
-  writeZone = import ./util/writeZone.nix {
-    inherit (dns) evalZone;
-    inherit (pkgs) writeTextFile;
-  };
-in
-
-{
-  inherit (dns) evalZone;
-  inherit (dns) combinators;
-  inherit writeZone;
-
-  toString = name: zone: toString (dns.evalZone name zone);
-} // dns.combinators
+# SPDX-License-Identifier: CC0-1.0
+
+(import (
+  fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz";
+    sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; }
+) {
+  src =  ./.;
+}).defaultNix

diff --git a/example.nix b/example.nix
@@ -5,9 +5,10 @@
 #
 
 let
-  dns = import ./. { };
+  dns = import ./.;
+  util = dns.util.${builtins.currentSystem};
 
-  testZone = with dns.combinators; {
+  testZone = with dns.lib.combinators; {
     SOA = {
       nameServer = "ns.test.com.";
       adminEmail = "admin@test.com";

@@ -61,4 +62,4 @@ let
   };
 in
 
-dns.writeZone "test.com" testZone
+util.writeZone "test.com" testZone

diff --git a/flake.lock b/flake.lock
@@ -1,21 +1,38 @@
 {
   "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1614513358,
+        "narHash": "sha256-LakhOx3S1dRjnh0b5Dg3mbZyH0ToC9I8Y2wKSkBaTzU=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5466c5bbece17adaab2d82fae80b46e807611bf3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1587398327,
-        "narHash": "sha256-mEKkeLgUrzAsdEaJ/1wdvYn0YZBAKEG3AN21koD2AgU=",
+        "lastModified": 1616989418,
+        "narHash": "sha256-LcOn5wHR/1JwClfY/Ai/b+pSRY+d23QtIPQHwPAyHHI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5272327b81ed355bbed5659b8d303cf2979b6953",
+        "rev": "9d8e05e088ad91b7c62886a2175f38bfa443db2c",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
     }

diff --git a/flake.nix b/flake.nix
@@ -1,12 +1,36 @@
-# SPDX-FileCopyrightText: 2020 Kirill Elagin <kirelagin@gmail.com>
+# SPDX-FileCopyrightText: 2021 Kirill Elagin <https://kir.elagin.me/>
 #
 # SPDX-License-Identifier: MIT
+
 {
   description = "Nix DSL for defining DNS zones";
 
-  outputs = { self, nixpkgs }: {
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    let
+      inherit (nixpkgs) lib;
+      dns = import ./dns { inherit lib; };
+    in {
 
-    lib = import ./default.nix { pkgs = nixpkgs; };
+      lib = {
+        inherit (dns) evalZone;
+        inherit (dns) combinators;
+        toString = name: zone: builtins.toString (dns.evalZone name zone);
+      } // dns.combinators;
 
-  };
+    } // flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        util = {
+          writeZone = import ./util/writeZone.nix {
+            inherit (self.lib) evalZone;
+            inherit (pkgs) writeTextFile;
+          };
+        };
+      }
+    );
 }