fix(ui): display short commit SHA next to Tachyon version in UI and constants

build.sh

@@ -255,8 +255,13 @@ build_backend_root() {
   install -m 0755 "$ROOT_DIR/tachyon/files/usr/bin/tachyon" "$output_root/usr/bin/tachyon"
   cp -a "$ROOT_DIR/tachyon/files/usr/lib/." "$output_root/usr/lib/tachyon/"
 
+  local commit_sha="${GIT_COMMIT_SHA:-}"
+  if [[ -z "$commit_sha" || "$commit_sha" == "unknown" ]]; then
+    commit_sha="$(git -C "$ROOT_DIR" rev-parse --short HEAD 2>/dev/null || echo "unknown")"
+  fi
+
   sed -i -e "s/__COMPILED_VERSION_VARIABLE__/${RELEASE_VERSION}/g" \
-    -e "s/__COMPILED_COMMIT_SHA__/${GIT_COMMIT_SHA}/g" \
+    -e "s/__COMPILED_COMMIT_SHA__/${commit_sha}/g" \
     "$output_root/usr/lib/tachyon/core/constants.uc"
 
   normalize_package_root_modes "$output_root"

fe-app-tachyon/src/tachyon/tabs/updates/initController.ts

@@ -1061,13 +1061,23 @@ function renderComponentCard(card: ComponentCard) {
   const anyActionLoading = isAnyActionLoading();
   const systemInfoLoading = isSystemInfoLoading();
 
+  const checkResult = getVisibleCheckResult(card.component);
+  let versionText = card.version;
+  const sha =
+    checkResult?.current_sha ||
+    store.get().diagnosticsSystemInfo?.tachyon_commit_sha;
+  if (card.component === 'tachyon' && sha && sha !== 'unknown') {
+    const shortSha = sha.substring(0, 7);
+    versionText = `${card.version} (${shortSha})`;
+  }
+
   // 1. Header (displays Title, Current Version, no badges)
   const headerChildren: Node[] = [
     E('b', { class: 'tachyon_updates-page__component__title' }, card.title),
     E(
       'span',
       { class: 'tachyon_updates-page__component__header-version' },
-      card.version,
+      versionText,
     ),
   ];
   if (card.repoUrl) {
@@ -1093,7 +1103,6 @@ function renderComponentCard(card: ComponentCard) {
 
   // 2. Details (renders status messages for check results)
   const detailsChildren: Node[] = [];
-  const checkResult = getVisibleCheckResult(card.component);
 
   if (checkResult && checkResult.status) {
     let labelText = '';

luci-app-tachyon/htdocs/luci-static/resources/view/tachyon/main.js

@@ -14798,12 +14798,19 @@ function renderComponentCard(card) {
   const updatesActions = store.get().updatesActions;
   const anyActionLoading = isAnyActionLoading();
   const systemInfoLoading = isSystemInfoLoading();
+  const checkResult = getVisibleCheckResult(card.component);
+  let versionText = card.version;
+  const sha = checkResult?.current_sha || store.get().diagnosticsSystemInfo?.tachyon_commit_sha;
+  if (card.component === "tachyon" && sha && sha !== "unknown") {
+    const shortSha = sha.substring(0, 7);
+    versionText = `${card.version} (${shortSha})`;
+  }
   const headerChildren = [
     E("b", { class: "tachyon_updates-page__component__title" }, card.title),
     E(
       "span",
       { class: "tachyon_updates-page__component__header-version" },
-      card.version
+      versionText
     )
   ];
   if (card.repoUrl) {
@@ -14827,7 +14834,6 @@ function renderComponentCard(card) {
     headerChildren
   );
   const detailsChildren = [];
-  const checkResult = getVisibleCheckResult(card.component);
   if (checkResult && checkResult.status) {
     let labelText = "";
     const latestValueNodes = [];

tachyon/files/usr/lib/core/constants.uc

@@ -62,11 +62,31 @@ function detect_installed_version() {
     return "";
 }
 
+function detect_installed_commit_sha() {
+    let sha = env("TACHYON_COMMIT_SHA", "__COMPILED_COMMIT_SHA__");
+    if (sha != "" && !match(sha, /COMPILED/) && sha != "unknown")
+        return sha;
+
+    let file_sha = trim(as_string(fs.readfile("/etc/tachyon_commit")));
+    if (file_sha != "" && file_sha != "unknown")
+        return file_sha;
+
+    let proc = fs.popen("git rev-parse --short HEAD 2>/dev/null");
+    if (proc != null) {
+        let git_sha = trim(as_string(proc.read("all")));
+        proc.close();
+        if (git_sha != "" && match(git_sha, /^[0-9a-fA-F]{7,40}$/) != null)
+            return git_sha;
+    }
+
+    return "";
+}
+
 function constants_map() {
     let c = {};
 
     c.TACHYON_VERSION = detect_installed_version();
-    c.TACHYON_COMMIT_SHA = env("TACHYON_COMMIT_SHA", "__COMPILED_COMMIT_SHA__");
+    c.TACHYON_COMMIT_SHA = detect_installed_commit_sha();
     c.TACHYON_CONFIG_NAME = env("TACHYON_CONFIG_NAME", "tachyon");
     c.TACHYON_CONFIG = env("TACHYON_CONFIG", "/etc/config/" + c.TACHYON_CONFIG_NAME);
     c.TACHYON_BIN = env("TACHYON_BIN", "/usr/bin/tachyon");