better display (Azure#16393)

Author: msyyc

scripts/automation_generate.sh

@@ -15,3 +15,8 @@ python -m packaging_tools.auto_codegen "$1" "$TMPDIR/venv-sdk/auto_temp.json" 2>
 echo "[Generate] codegen done!!!"
 python -m packaging_tools.auto_package "$TMPDIR/venv-sdk/auto_temp.json" "$2" 2>&1
 echo "[Generate] generate done!!!"
+
+if [ ! -f "$2" ]; then
+  echo "$2 does not exist!!!"
+  exit 1
+fi

tools/azure-sdk-tools/packaging_tools/swaggertosdk/autorest_tools.py

@@ -137,6 +137,10 @@ def execute_simple_command(cmd_line, cwd=None, shell=False, env=None):
         process.wait()
         output = "\n".join(output_buffer)
         if process.returncode:
+            # print necessary error info
+            for i in range(-min(len(output_buffer), 5), 0):
+                print(f'[Autorest] {output_buffer[i]}')
+
             raise subprocess.CalledProcessError(
                 process.returncode,
                 cmd_line,