From 2a701eb5eb0014cbb007c68d4a3415ffdf54c7e6 Mon Sep 17 00:00:00 2001
From: cjshearer <cjshearer@live.com>
Date: Tue, 25 Jun 2024 14:18:07 -0400
Subject: [PATCH] build: ignore unused files in `nix build`

To avoid unnecessary rebuilds, we now ignore
unused files from the build src.
---
 README.md |  6 +++---
 flake.nix | 27 +++++++++++++++++++++------
 2 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 5c5424f..0f7cd8f 100644
--- a/README.md
+++ b/README.md
@@ -82,12 +82,12 @@ GitHub Actions is configured to build the site using Nix. Now that your site is
 
 Nix also requires the expected hash of downloaded dependencies. Now that `modern-hugo-resume` is imported, you will need to update this hash. Follow the instructions above `outputHash` in [`flake.nix`](./flake.nix).
 
-See [`cjshearer.dev/flake.nix`](https://github.com/cjshearer/cjshearer.dev/blob/77b6e94990ca1f7168760a41ea3ee7e9b3745b17/flake.nix) for reference.
+See [`cjshearer.dev/flake.nix`](https://github.com/cjshearer/cjshearer.dev/blob/9b49eaef33ed9fb4d8726f6578085d76145c3d1a/flake.nix) for reference.
 
 ```diff
 # flake.nix
-- sourceRoot = "exampleSite";
-+ sourceRoot = ".";
+- buildFolder = "exampleSite";
++ buildFolder = ".";
 ...
 - pname = "modern-hugo-resume-exampleSite"
 + pname = "<your username>.github.io"
diff --git a/flake.nix b/flake.nix
index f08bb5d..fe6fdd7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,7 +19,7 @@
         nodejs = pkgs.nodejs_22;
         pnpm = pkgs.pnpm;
         nativeBuildInputs = [ go hugo nodejs pnpm ];
-        sourceRoot = "exampleSite";
+        buildFolder = "exampleSite";
       in
       {
         checks = {
@@ -38,13 +38,28 @@
           # TODO: remove `name` once I get around to versioning this
           name = finalAttrs.pname;
 
-          src = ./.;
-          setSourceRoot = "sourceRoot=$(echo *-source/${sourceRoot})";
+          src = with pkgs.lib.fileset; (toSource {
+            root = ./.;
+            fileset = difference
+              (gitTracked ./.)
+              (unions [
+                ./.github
+                ./.vscode
+                ./.envrc
+                ./.gitignore
+                ./biome.json
+                ./LICENSE
+                ./README.md
+              ])
+            ;
+          });
+
+          sourceRoot = "${finalAttrs.src.name}/${buildFolder}";
 
           nativeBuildInputs = nativeBuildInputs ++ [ pnpm.configHook ];
 
           pnpmDeps = pnpm.fetchDeps {
-            inherit (finalAttrs) pname src setSourceRoot;
+            inherit (finalAttrs) pname src sourceRoot;
             hash = "sha256-RvE4R277Kam3s32XbGUIQTToG0cpbhpTaLEU5HsNZZ4=";
           };
 
@@ -52,7 +67,7 @@
             let
               hugoVendor = pkgs.stdenv.mkDerivation {
                 name = "${finalAttrs.pname}-hugoVendor";
-                inherit (finalAttrs) src setSourceRoot;
+                inherit (finalAttrs) src sourceRoot;
                 nativeBuildInputs = [ go hugo git ];
 
                 buildPhase = ''
@@ -88,7 +103,7 @@
           ];
 
           shellHook = self.checks.${system}.pre-commit-check.shellHook + ''
-            pushd ${sourceRoot}
+            pushd ${buildFolder}
             
             pnpm install