move documentation pinning to nix flake inputs

flake.lock

@@ -112,6 +112,22 @@
         "type": "github"
       }
     },
+    "documentation-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1664745127,
+        "narHash": "sha256-kq0qvmXz/gaJPtU4O43chNZulP4haXRXunjJF2gpKZk=",
+        "owner": "dump-dvb",
+        "repo": "documentation",
+        "rev": "be20b49cc2b25e2b77c3d9ac25044121d7d4dfe0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "dump-dvb",
+        "repo": "documentation",
+        "type": "github"
+      }
+    },
     "dump-dvb": {
       "inputs": {
         "click": "click",
@@ -377,6 +393,7 @@
     },
     "root": {
       "inputs": {
+        "documentation-src": "documentation-src",
         "dump-dvb": "dump-dvb",
         "microvm": "microvm",
         "nixpkgs": "nixpkgs",

flake.nix

@@ -16,6 +16,11 @@
       url = github:Mic92/sops-nix;
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    documentation-src = {
+      url = github:dump-dvb/documentation;
+      flake = false;
+    };
   };
 
   outputs =
@@ -24,6 +29,7 @@
     , microvm
     , nixpkgs
     , sops-nix
+    , documentation-src
     , ...
     }:
     let
@@ -40,6 +46,7 @@
           nixpkgs.overlays = [
             dump-dvb.overlays.default
             (final: prev: {
+              inherit documentation-src;
               options-docs = (pkgs.nixosOptionsDoc {
                 options = self.nixosConfigurations.data-hoarder.options.dump-dvb;
               }).optionsCommonMark;
@@ -122,6 +129,7 @@
         staging-microvm = self.nixosConfigurations.staging-data-hoarder.config.microvm.declaredRunner;
         data-hoarder-microvm = self.nixosConfigurations.data-hoarder.config.microvm.declaredRunner;
         docs = pkgs.callPackage ./pkgs/documentation.nix {
+          inherit documentation-src;
           options-docs = (pkgs.nixosOptionsDoc {
             options = self.nixosConfigurations.data-hoarder.options.dump-dvb;
           }).optionsCommonMark;

pkgs/documentation.nix

@@ -1,14 +1,9 @@
-{ pkgs, lib, stdenv, mdbook-mermaid, mdbook, options-docs, fetchFromGitHub }:
+{ pkgs, lib, stdenv, mdbook-mermaid, mdbook, documentation-src, options-docs, fetchFromGitHub }:
 stdenv.mkDerivation {
   pname = "dvb-dump-docs";
   version = "0.1.0";
 
-  src = pkgs.fetchFromGitHub {
-    owner = "dump-dvb";
-    repo = "documentation";
-    rev = "8393cd4a965aa6b75f3e0fff6f82ba1365515290"; #TODO: use tag
-    sha256 = "sha256-HppCT0UfshDxm3UNXACilpHTdvtjFs2vqpH8vbLmHTg=";
-  };
+  src = documentation-src;
 
   nativeBuildInputs = [ mdbook mdbook-mermaid ];