Update git output section

src/main.rs

@@ -12,7 +12,7 @@ use axum::{
 use clap::Parser;
 use std::sync::Arc;
 use tokio::process::Command;
-use tokio::sync::RwLock;
+use tokio::sync::{Mutex, RwLock};
 use tower_http::services::ServeDir;
 
 #[derive(Parser, Debug)]
@@ -26,6 +26,7 @@ struct Args {
 #[derive(Clone)]
 struct AppState {
     post_manager: Arc<RwLock<post_manager::PostManager>>,
+    update_lock: Arc<Mutex<()>>,
 }
 
 #[tokio::main]
@@ -38,6 +39,7 @@ async fn main() {
 
     let app_state = AppState {
         post_manager: post_manager.clone(),
+        update_lock: Arc::new(Mutex::new(())),
     };
 
     if args.no_cache {
@@ -105,6 +107,9 @@ async fn post_handler(
 }
 
 async fn update_handler(State(state): State<AppState>) -> impl IntoResponse {
+    // Acquire lock to prevent concurrent updates
+    let _lock = state.update_lock.lock().await;
+
     // Run git pull --autostash
     let output = Command::new("git")
         .arg("pull")