feat: include hash in final build

flake.nix

@@ -105,6 +105,7 @@
               templ
               tailwindcss
               makeWrapper
+              nix
             ];
             preBuild =
               let
@@ -118,11 +119,14 @@
                 inherit (builtins) length genList elemAt;
               in
               ''
+                ldflags+=" -X main.hash=$(nix-hash ${./.})"
+
                 ${builtins.concatStringsSep "\n" (
                   genList (
                     i: "install -D ${font}/share/fonts/woff2/iosevka-comfy-fixed-${elemAt targets i}.woff2 static/"
                   ) (length targets)
                 )}
+
                 templ generate
                 tailwindcss -i static/style.css -o static/generated.css
               '';

main.go

@@ -9,8 +9,12 @@ import (
 	"app/pkg/routes/root"
 )
 
+var (
+	hash string;
+)
+
 func main() {
-	serv := app.Server{Port: 8080}
+	serv := app.Server{Port: 8080, Hash: hash}
 
 	serv.AddRoute("GET /", root.Handler)
 	serv.AddRoute("GET /health", health.Handler)

pkg/app/app.go

@@ -14,6 +14,7 @@ import (
 
 type Server struct {
 	Port int16
+	Hash string
 }
 
 func (serv *Server) Run() {

pkg/app/template.templ

@@ -47,7 +47,7 @@ templ (app *Server) Template(body templ.Component) {
 					opinions listed here are my own and not representative of any of my employers, past, future, and/or present.
 				</p>
 				<p>
-					Served by me, with site version 00000000, source code available
+					Served by me using Nix and Docker. Current build hash: "{ app.Hash }", source code available
 					<a href="https://github.com/drawbu/drawbu.dev" target="_blank" rel="noopener">here</a>.
 				</p>
 			</footer>