fix: head 100 stderr when startup failed (#59)

Author: gxkl

lib/cmd/start.js

@@ -265,9 +265,12 @@ class StartCommand extends Command {
       try {
         const args = [ '-n', '100', stderr ];
         this.logger.error('tail %s', args.join(' '));
-        const [ stdout ] = await execFile('tail', args);
+        const [ headStdout ] = await execFile('head', args);
+        const [ tailStdout ] = await execFile('tail', args);
         this.logger.error('Got error when startup: ');
-        this.logger.error(stdout);
+        this.logger.error(headStdout);
+        this.logger.error('...');
+        this.logger.error(tailStdout);
       } catch (err) {
         this.logger.error('ignore tail error: %s', err);
       }