utils/get-developers: use parser.error() rather than canned print+return

parser.error() reports a nice error message, that also displays a short
reminder of the available options.

Adapt the test-suite accordingly: previously, the error string was an
exact string in the stdout list, while it now is a substring in one of
the strings in stderr. The exit code changes, too.

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>
Cc: Julien Olivain <ju.o@free.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 35f381b93e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/testing/tests/utils/test_get_developers.py

@@ -41,9 +41,9 @@ class TestGetDevelopers(unittest.TestCase):
         # no args, with syntax error in the file
         developers = b'text3\n'
         out, err, rc = call_get_developers("./utils/get-developers", [], self.WITH_EMPTY_PATH, topdir, developers)
-        self.assertIn("No action specified", out)
-        self.assertEqual(rc, 0)
-        self.assertEqual(len(err), 0)
+        self.assertIn("No action specified", "\n".join(err))
+        self.assertEqual(rc, 2)
+        self.assertEqual(len(out), 0)
 
         # -v generating error, called from the main dir
         developers = b'text1\n'
@@ -150,9 +150,9 @@ class TestGetDevelopers(unittest.TestCase):
         # no args, with syntax error in the file
         developers = b'text3\n'
         out, err, rc = call_get_developers("./utils/get-developers", [], self.WITH_EMPTY_PATH, topdir, developers)
-        self.assertIn("No action specified", out)
-        self.assertEqual(rc, 0)
-        self.assertEqual(len(err), 0)
+        self.assertIn("No action specified", "\n".join(err))
+        self.assertEqual(rc, 2)
+        self.assertEqual(len(out), 0)
 
         # patchfile from topdir and from elsewhere
         abs_path = infra.filepath("tests/utils/test_get_developers/")

utils/get-developers

@@ -40,11 +40,9 @@ def __main__():
     if len(args.patches) != 0:
         action += 1
     if action > 1:
-        print("Cannot do more than one action")
-        return
+        parser.error("Cannot do more than one action")
     if action == 0:
-        print("No action specified")
-        return
+        parser.error("No action specified")
 
     devs = getdeveloperlib.parse_developers(args.filename)
     if devs is None: