add deprecation warning to dsl-compile (#7628)

sdk/python/kfp/cli/cli_test.py

@@ -17,6 +17,7 @@ import itertools
 import json
 import os
 import re
+import subprocess
 import tempfile
 import unittest
 from typing import Any, Dict, List, Optional
@@ -117,7 +118,7 @@ class TestCliAutocomplete(parameterized.TestCase):
     def test_show_autocomplete(self, shell):
         result = self.invoke(args=['--show-completion', shell])
         expected = cli._create_completion(shell)
-        self.assertTrue(expected in result.output)
+        self.assertIn(expected, result.output)
         self.assertEqual(result.exit_code, 0)
 
     @parameterized.parameters(['bash', 'zsh', 'fish'])
@@ -256,6 +257,11 @@ class TestDslCompile(parameterized.TestCase):
         result = self.invoke_deprecated(['--help'])
         self.assertEqual(result.exit_code, 0)
 
+    def test_deprecation_warning(self):
+        res = subprocess.run(['dsl-compile', '--help'], capture_output=True)
+        self.assertIn('Deprecated. Please use `kfp dsl compile` instead.)',
+                      res.stdout.decode('utf-8'))
+
 
 info_dict = cli.cli.to_info_dict(ctx=click.Context(cli.cli))
 commands_dict = {

sdk/python/kfp/cli/dsl_compile.py

@@ -147,6 +147,7 @@ def dsl_compile(
 def main():
     logging.basicConfig(format='%(message)s', level=logging.INFO)
     try:
+        dsl_compile.help = '(Deprecated. Please use `kfp dsl compile` instead.)\n\n' + dsl_compile.help
         dsl_compile(obj={}, auto_envvar_prefix='KFP')
     except Exception as e:
         click.echo(str(e), err=True)