diff --git a/src/app.rs b/src/app.rs
index bfa0e2f..ce5d490 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -370,7 +370,7 @@ struct CommitBody {
     extra: HashMap<String, Value>,
 }
 
-#[derive(Deserialize)]
+#[derive(Deserialize, Debug)]
 struct Signature {
     username: String,
     email: String,
@@ -459,6 +459,8 @@ async fn commit_handler(
         }
     }
 
+    info!("committing ...");
+
     // Validate required fields
     let path = match path {
         Some(p) => p,
@@ -470,6 +472,8 @@ async fn commit_handler(
         }
     };
 
+    info!("path: [{path}]");
+
     let signature_username = match signature_username {
         Some(su) => su,
         None => {
@@ -506,6 +510,8 @@ async fn commit_handler(
         email: signature_email,
     };
 
+    info!("sig: {signature:?}");
+
     // Get branch name from config
     let branch = state
         .clone()
@@ -533,14 +539,22 @@ async fn commit_handler(
         }
     };
 
+    info!("commit success! [{commit_oid}]");
+
     // save history
     let redis_pre_lock = state.redis.clone();
     {
         if let Ok(mut rl) = redis_pre_lock.get().await {
-            let _ = rl.rpush(
-                format!("{}.history", path),
-                format!("commit-{}", commit_oid),
-            );
+            match rl
+                .rpush(
+                    format!("{}.history", path),
+                    format!("commit-{}", commit_oid),
+                )
+                .await
+            {
+                Ok(_) => info!("history saved"),
+                Err(e) => error!("save history fail: {e:?}"),
+            }
         }
     }
 
@@ -881,10 +895,10 @@ fn pull(
             rlock.set_head(&refname)?;
             rlock.checkout_head(Some(git2::build::CheckoutBuilder::default().force()))?;
             info!("Fast-forwared to {}", fetch_commit.id());
-        } else if analysis.0.is_normal() {
-            warn!("need manual merge");
-        } else {
+        } else if analysis.0.is_up_to_date() {
             info!("already up to date");
+        } else {
+            return Err("cannot fast-forward, local changes would be overwritten".into());
         }
 
         return Ok(());