From 761f4b835101d89b593480dba51caafaa275fd85 Mon Sep 17 00:00:00 2001
From: iris <iris@hyperhive.local>
Date: Fri, 31 Jul 2026 19:32:20 +0200
Subject: [PATCH 1/2] dashboard: surface the hive's hyperhive rev on the H0M3
 start page

Adds hyperhive_rev to the dashboard's /api/state StateSnapshot,
resolved via the same current_flake_rev helper get_agent_meta's
per-agent hyperhive_rev already uses. home.js renders it next to the
existing hive-identity line, truncated to the last 12 chars with the
full value in title=, hidden when the flake ref isn't a local path pin.

Requested by annika (infra.run) via dmatrix, hyperhive#2854.
---
 frontend/packages/dashboard/src/home.js    | 13 +++++++++++++
 frontend/packages/dashboard/src/index.html |  1 +
 hive-c0re/src/dashboard/state_snapshot.rs  |  8 ++++++++
 3 files changed, 22 insertions(+)

diff --git a/frontend/packages/dashboard/src/home.js b/frontend/packages/dashboard/src/home.js
index 70b13dc6..0dead042 100644
--- a/frontend/packages/dashboard/src/home.js
+++ b/frontend/packages/dashboard/src/home.js
@@ -48,6 +48,19 @@ async function init() {
     ident.textContent = parts.join(' / ');
     ident.hidden = false;
   }
+
+  // Rev line: absent when the flake ref isn't a local path pin (a bare
+  // `github:` url has no on-disk rev to canonicalize) — hidden rather
+  // than showing a placeholder in that case.
+  const rev = $('hive-rev');
+  if (rev && state.hyperhive_rev) {
+    const short = state.hyperhive_rev.length > 16
+      ? `…${state.hyperhive_rev.slice(-12)}`
+      : state.hyperhive_rev;
+    rev.textContent = `rev ${short}`;
+    rev.title = state.hyperhive_rev;
+    rev.hidden = false;
+  }
 }
 
 init();
diff --git a/frontend/packages/dashboard/src/index.html b/frontend/packages/dashboard/src/index.html
index c6b98a8a..cabbc40a 100644
--- a/frontend/packages/dashboard/src/index.html
+++ b/frontend/packages/dashboard/src/index.html
@@ -30,6 +30,7 @@
   <header class="home-header">
     <p class="banner-thin" id="hive-identity" hidden></p>
     <pre class="banner">░▒▓█▓▒░  ░▒▓█▓▒░  H Y P E R H I V E  ·  H0M3  ░▒▓█▓▒░  ░▒▓█▓▒░</pre>
+    <p class="banner-thin" id="hive-rev" hidden></p>
   </header>
 
   <main class="home-main">
diff --git a/hive-c0re/src/dashboard/state_snapshot.rs b/hive-c0re/src/dashboard/state_snapshot.rs
index ff23cb98..14d96eb6 100644
--- a/hive-c0re/src/dashboard/state_snapshot.rs
+++ b/hive-c0re/src/dashboard/state_snapshot.rs
@@ -37,6 +37,13 @@ pub(super) struct StateSnapshot {
     /// "apply everything you've buffered".
     seq: u64,
     hostname: String,
+    /// Current rev of the pinned `hyperhive` flake input, resolved the
+    /// same way `get_agent_meta`'s per-agent `hyperhive_rev` is (see
+    /// `auto_update::current_flake_rev`). `None` when the flake ref
+    /// isn't a local path pin (e.g. a bare `github:` url) or the rev
+    /// can't be resolved. Feeds the dashboard start page so an operator
+    /// can tell what build a hive is running without shelling in.
+    hyperhive_rev: Option<String>,
     any_stale: bool,
     containers: Vec<ContainerView>,
     transients: Vec<TransientView>,
@@ -382,6 +389,7 @@ pub(super) async fn api_state(
     axum::Json(StateSnapshot {
         seq,
         hostname,
+        hyperhive_rev: crate::auto_update::current_flake_rev(&state.coord.hyperhive_flake),
         any_stale,
         containers,
         transients,

From abffa5234daa9340e7452adb9269e19c016418ee Mon Sep 17 00:00:00 2001
From: iris <iris@hyperhive.local>
Date: Fri, 31 Jul 2026 19:37:41 +0200
Subject: [PATCH 2/2] fix(#2854): slice the store-path hash from the front, not
 the pname suffix from the back

current_flake_rev canonicalizes to /nix/store/<hash>-<pname>; the
hash right after /nix/store/ is what varies between builds, the
trailing -<pname> is constant. slice(-12) was taking the tail, so
two different builds would very likely render the same truncated
string. slice the hash prefix out instead, with a plain head-slice
fallback for a non-store-path rev (e.g. a bare local dir in dev).

damocles caught this in review on PR #2869.
---
 frontend/packages/dashboard/src/home.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/frontend/packages/dashboard/src/home.js b/frontend/packages/dashboard/src/home.js
index 0dead042..fc4918e1 100644
--- a/frontend/packages/dashboard/src/home.js
+++ b/frontend/packages/dashboard/src/home.js
@@ -52,11 +52,18 @@ async function init() {
   // Rev line: absent when the flake ref isn't a local path pin (a bare
   // `github:` url has no on-disk rev to canonicalize) — hidden rather
   // than showing a placeholder in that case.
+  //
+  // `current_flake_rev` canonicalizes to a nix store path
+  // (/nix/store/<hash>-<pname>) — the part that actually varies between
+  // builds is the hash right after `/nix/store/`, not the trailing
+  // `-<pname>` (constant across revs). Slice the hash out of the front
+  // rather than truncating from the tail, so two different builds don't
+  // render as the same string. Falls back to a plain head-slice for a
+  // non-store path (e.g. a bare local dir during dev).
   const rev = $('hive-rev');
   if (rev && state.hyperhive_rev) {
-    const short = state.hyperhive_rev.length > 16
-      ? `…${state.hyperhive_rev.slice(-12)}`
-      : state.hyperhive_rev;
+    const storeMatch = state.hyperhive_rev.match(/^\/nix\/store\/([^-]+)/);
+    const short = storeMatch ? storeMatch[1].slice(0, 12) : state.hyperhive_rev.slice(0, 12);
     rev.textContent = `rev ${short}`;
     rev.title = state.hyperhive_rev;
     rev.hidden = false;