judge: auto-remove extra files (#104)

packages/hydrojudge/src/hosts/hydro.ts

@@ -202,10 +202,15 @@ export default class Hydro {
         } catch (e) { /* ignore */ }
         const version = {};
         const filenames = [];
+        const allFiles = new Set<string>();
         for (const file of files) {
+            allFiles.add(file.name);
             version[file.name] = file.etag;
             if (etags[file.name] !== file.etag) filenames.push(file.name);
         }
+        for (const name in etags) {
+            if (!allFiles.has(name)) await fs.rm(path.join(filePath, name));
+        }
         if (filenames.length) {
             log.info(`Getting problem data: ${this.config.host}/${domainId}/${pid}`);
             if (next) next({ judge_text: '正在同步测试数据，请稍后' });