fix(build): pass git hash to Nix builds via env var

- build.rs checks GIT_HASH env var before shelling out to git
- flake.nix injects self.shortRev into the build environment
- Remove version number from footer, keep only commit hash

build.rs

@@ -7,14 +7,15 @@ fn main() {
 }
 
 fn git_hash() {
-    let output = Command::new("git")
+    let hash = std::env::var("GIT_HASH").ok().or_else(|| {
+        Command::new("git")
             .args(["rev-parse", "--short", "HEAD"])
             .output()
             .ok()
             .filter(|o| o.status.success())
             .and_then(|o| String::from_utf8(o.stdout).ok())
-        .unwrap_or_default();
-    let hash = output.trim();
+    });
+    let hash = hash.as_deref().map(str::trim).unwrap_or_default();
     println!("cargo:rustc-env=GIT_HASH={hash}");
 }
 

flake.nix

@@ -63,6 +63,7 @@
                 stdenv.cc.cc.lib
               ];
 
+              env.GIT_HASH = self.shortRev or self.dirtyShortRev or "dev";
               env.LD_LIBRARY_PATH = lib.makeLibraryPath [ pkgs.openssl ];
 
               meta = {

templates/base.html

@@ -116,7 +116,7 @@
     <main class="mx-auto flex w-full max-w-5xl flex-col gap-8 px-6 py-10">
       {% include "partials/nav.html" %} {% block content %}{% endblock %}
       <footer class="mt-8 text-center text-xs tracking-widest text-text-muted" style="font-variant: small-caps">
-        <p>B{rew}log by <a href="https://jnsgr.uk" class="text-text-muted hover:text-accent transition" target="_blank" rel="noreferrer noopener">jnsgruk</a> · {{ version_info.version }} · <a href="https://github.com/jnsgruk/brewlog/commit/{{ version_info.commit }}" class="text-text-muted hover:text-accent transition" target="_blank" rel="noreferrer noopener">{{ version_info.commit }}</a></p>
+        <p>B{rew}log by <a href="https://jnsgr.uk" class="text-text-muted hover:text-accent transition" target="_blank" rel="noreferrer noopener">jnsgruk</a> · <a href="https://github.com/jnsgruk/brewlog/commit/{{ version_info.commit }}" class="text-text-muted hover:text-accent transition" target="_blank" rel="noreferrer noopener">{{ version_info.commit }}</a></p>
       </footer>
     </main>
   </body>