Expose git commit hash to backend info api.

backend/src/api/backend-info.ts

@@ -0,0 +1,29 @@
+import * as fs from 'fs';
+import * as os from 'os';
+
+class BackendInfo {
+  gitCommitHash = '';
+  hostname = '';
+
+  constructor() {
+    this.setLatestCommitHash();
+    this.hostname = os.hostname();
+  }
+
+  public getBackendInfo() {
+    return {
+      'hostname': this.hostname,
+      'git-commit': this.gitCommitHash,
+    };
+  }
+
+  private setLatestCommitHash(): void {
+    try {
+      this.gitCommitHash = fs.readFileSync('../.git/refs/heads/master').toString().trim();
+    } catch (e) {
+      console.log('Could not load git commit info, skipping.');
+    }
+  }
+}
+
+export default new BackendInfo();