fix: use POST for new files, PUT only for updates

.gitea/workflows/autograde.yml

@@ -238,28 +238,35 @@ jobs:
             # Base64 编码
             CONTENT=$(base64 -w 0 "$REPORT_FILE")
             
-            # 检查文件是否存在
+            # 先尝试 POST 创建新文件
-            SHA=$(curl -s -H "Authorization: token $TOKEN" \
+            RESULT=$(curl -s -X POST -H "Authorization: token $TOKEN" \
-              "$API_URL/repos/$REPO/contents/$DEST_PATH" \
-              | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('sha','') if isinstance(d,dict) else '')" 2>/dev/null || echo "")
-            
-            # 构建请求
-            if [ -n "$SHA" ]; then
-              JSON_DATA="{\"message\": \"Update grade report for $SHORT_SHA\", \"content\": \"$CONTENT\", \"sha\": \"$SHA\"}"
-            else
-              JSON_DATA="{\"message\": \"Add grade report for $SHORT_SHA\", \"content\": \"$CONTENT\"}"
-            fi
-            
-            # 上传文件
-            RESULT=$(curl -s -X PUT -H "Authorization: token $TOKEN" \
               -H "Content-Type: application/json" \
               "$API_URL/repos/$REPO/contents/$DEST_PATH" \
-              -d "$JSON_DATA")
+              -d "{\"message\": \"Add grade report for $SHORT_SHA\", \"content\": \"$CONTENT\"}")
             
             if echo "$RESULT" | grep -q '"content"'; then
               echo "✅ Report uploaded to $DEST_PATH"
             else
-              echo "⚠️ Failed to upload report: $RESULT"
+              # POST 失败，可能文件已存在，尝试获取 SHA 并 PUT 更新
+              echo "POST failed, trying PUT with SHA..."
+              SHA=$(curl -s -H "Authorization: token $TOKEN" \
+                "$API_URL/repos/$REPO/contents/$DEST_PATH" \
+                | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('sha','') if isinstance(d,dict) and 'sha' in d else '')" 2>/dev/null || echo "")
+              
+              if [ -n "$SHA" ]; then
+                RESULT=$(curl -s -X PUT -H "Authorization: token $TOKEN" \
+                  -H "Content-Type: application/json" \
+                  "$API_URL/repos/$REPO/contents/$DEST_PATH" \
+                  -d "{\"message\": \"Update grade report for $SHORT_SHA\", \"content\": \"$CONTENT\", \"sha\": \"$SHA\"}")
+                
+                if echo "$RESULT" | grep -q '"content"'; then
+                  echo "✅ Report updated at $DEST_PATH"
+                else
+                  echo "⚠️ Failed to update report: $RESULT"
+                fi
+              else
+                echo "⚠️ Could not get file SHA, upload failed"
+              fi
             fi
           fi