gh-109566, regrtest: Add --fast-ci and --slow-ci options (#109570)

* Add --fast-ci and --slow-ci options to libregrtest:

  * --fast-ci uses a default timeout of 10 minutes and "-u all,-cpu"
    (skip slowest tests).
  * --slow-ci uses a default timeout of 20 minues and "-u all" (run
    all tests).

* regrtest header now lists test resources.
* Makefile changes:

  * "make test", "make hostrunnertest" and "make coverage-report" now
    use --fast-ci option and TESTTIMEOUT variable.
  * "make buildbottest" now uses "--slow-ci". Remove options which
    became redundant with "--slow-ci".
  * "make testall" and "make testuniversal" now use --slow-ci option
    and TESTTIMEOUT variable.
  * "make testall" now uses "find -exec rm ..." instead of
    "find ... -print|xargs rm ...", same as "make clean".

* GitHub Actions workflow:

  * Ubuntu and Address Sanitizer jobs now use "make test". Remove
    options which became redundant with "--fast-ci".
  * Windows jobs now use --fast-ci option.
  * Use -j0 to detect the number of CPUs.

* Set Makefile TESTTIMEOUT default to an empty string, since
  --slow-ci and --fast-ci use different default timeout. It's now
  accepted to pass "--timeout=" to regrtest: treated as not timeout.
* Tools/scripts/run_tests.py now uses --fast-ci option.
* Tools/buildbot/test.bat now uses --slow-ci option. Remove
  --timeout=1200 option, redundant with --slow-ci.

5 files changed, 113 insertions, 7 deletions

diff --git a/Lib/test/libregrtest/cmdline.py b/Lib/test/libregrtest/cmdline.py
index 99f2815..a0a8504 100644
--- a/Lib/test/libregrtest/cmdline.py
+++ b/Lib/test/libregrtest/cmdline.py
@@ -4,6 +4,8 @@ import shlex
 import sys
 from test.support import os_helper
 
+from .utils import MS_WINDOWS
+
 
 USAGE = """\
 python -m test [options] [test_name1 [test_name2 ...]]
@@ -145,6 +147,7 @@ RESOURCE_NAMES = ALL_RESOURCES + ('extralargefile', 'tzdata')
 
 class Namespace(argparse.Namespace):
     def __init__(self, **kwargs) -> None:
+        self.ci = False
         self.testdir = None
         self.verbose = 0
         self.quiet = False
@@ -209,7 +212,13 @@ def _create_parser():
     # We add help explicitly to control what argument group it renders under.
     group.add_argument('-h', '--help', action='help',
                        help='show this help message and exit')
-    group.add_argument('--timeout', metavar='TIMEOUT', type=float,
+    group.add_argument('--fast-ci', action='store_true',
+                       help='Fast Continuous Integration (CI) mode used by '
+                            'GitHub Actions')
+    group.add_argument('--slow-ci', action='store_true',
+                       help='Slow Continuous Integration (CI) mode used by '
+                            'buildbot workers')
+    group.add_argument('--timeout', metavar='TIMEOUT',
                         help='dump the traceback and exit if a test takes '
                              'more than TIMEOUT seconds; disabled if TIMEOUT '
                              'is negative or equals to zero')
@@ -384,7 +393,49 @@ def _parse_args(args, **kwargs):
     for arg in ns.args:
         if arg.startswith('-'):
             parser.error("unrecognized arguments: %s" % arg)
-            sys.exit(1)
+
+    if ns.timeout is not None:
+        # Support "--timeout=" (no value) so Makefile.pre.pre TESTTIMEOUT
+        # can be used by "make buildbottest" and "make test".
+        if ns.timeout != "":
+            try:
+                ns.timeout = float(ns.timeout)
+            except ValueError:
+                parser.error(f"invalid timeout value: {ns.timeout!r}")
+        else:
+            ns.timeout = None
+
+    # Continuous Integration (CI): common options for fast/slow CI modes
+    if ns.slow_ci or ns.fast_ci:
+        # Similar to options:
+        #
+        #     -j0 --randomize --fail-env-changed --fail-rerun --rerun
+        #     --slowest --verbose3 --nowindows
+        if ns.use_mp is None:
+            ns.use_mp = 0
+        ns.randomize = True
+        ns.fail_env_changed = True
+        ns.fail_rerun = True
+        ns.rerun = True
+        ns.print_slow = True
+        ns.verbose3 = True
+        if MS_WINDOWS:
+            ns.nowindows = True  # Silence alerts under Windows
+
+    # When both --slow-ci and --fast-ci options are present,
+    # --slow-ci has the priority
+    if ns.slow_ci:
+        # Similar to: -u "all" --timeout=1200
+        if not ns.use:
+            ns.use = [['all']]
+        if ns.timeout is None:
+            ns.timeout = 1200  # 20 minutes
+    elif ns.fast_ci:
+        # Similar to: -u "all,-cpu" --timeout=600
+        if not ns.use:
+            ns.use = [['all', '-cpu']]
+        if ns.timeout is None:
+            ns.timeout = 600  # 10 minutes
 
     if ns.single and ns.fromfile:
         parser.error("-s and -f don't go together!")
diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 0ec25a0..2cd79a1 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -425,7 +425,7 @@ class Regrtest:
         if (self.want_header
             or not(self.pgo or self.quiet or self.single_test_run
                    or tests or self.cmdline_args)):
-            display_header()
+            display_header(self.use_resources)
 
         if self.randomize:
             print("Using random seed", self.random_seed)
diff --git a/Lib/test/libregrtest/results.py b/Lib/test/libregrtest/results.py
index 1a8619f..35df50d 100644
--- a/Lib/test/libregrtest/results.py
+++ b/Lib/test/libregrtest/results.py
@@ -8,11 +8,13 @@ from .utils import (
     printlist, count, format_duration)
 
 
+# Python uses exit code 1 when an exception is not catched
+# argparse.ArgumentParser.error() uses exit code 2
 EXITCODE_BAD_TEST = 2
 EXITCODE_ENV_CHANGED = 3
 EXITCODE_NO_TESTS_RAN = 4
 EXITCODE_RERUN_FAIL = 5
-EXITCODE_INTERRUPTED = 130
+EXITCODE_INTERRUPTED = 130   # 128 + signal.SIGINT=2
 
 
 class TestResults:
diff --git a/Lib/test/libregrtest/utils.py b/Lib/test/libregrtest/utils.py
index 6af949c..f3f0eb5 100644
--- a/Lib/test/libregrtest/utils.py
+++ b/Lib/test/libregrtest/utils.py
@@ -547,7 +547,7 @@ def adjust_rlimit_nofile():
                           f"{new_fd_limit}: {err}.")
 
 
-def display_header():
+def display_header(use_resources: tuple[str, ...]):
     encoding = sys.stdout.encoding
 
     # Print basic platform information
@@ -569,6 +569,13 @@ def display_header():
     print("== encodings: locale=%s, FS=%s"
           % (locale.getencoding(), sys.getfilesystemencoding()))
 
+
+    if use_resources:
+        print(f"== resources ({len(use_resources)}): "
+              f"{', '.join(sorted(use_resources))}")
+    else:
+        print(f"== resources: (all disabled, use -u option)")
+
     # This makes it easier to remember what to set in your local
     # environment when trying to reproduce a sanitizer failure.
     asan = support.check_sanitizer(address=True)
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index 4b819cb..15aab60 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -23,8 +23,9 @@ import unittest
 from test import support
 from test.support import os_helper, TestStats, without_optimizer
 from test.libregrtest import cmdline
-from test.libregrtest import utils
+from test.libregrtest import main
 from test.libregrtest import setup
+from test.libregrtest import utils
 from test.libregrtest.utils import normalize_test_name
 
 if not support.has_subprocess_support:
@@ -75,8 +76,15 @@ class ParseArgsTestCase(unittest.TestCase):
     def test_timeout(self):
         ns = self.parse_args(['--timeout', '4.2'])
         self.assertEqual(ns.timeout, 4.2)
+
+        # negative, zero and empty string are treated as "no timeout"
+        for value in ('-1', '0', ''):
+            with self.subTest(value=value):
+                ns = self.parse_args([f'--timeout={value}'])
+                self.assertEqual(ns.timeout, None)
+
         self.checkError(['--timeout'], 'expected one argument')
-        self.checkError(['--timeout', 'foo'], 'invalid float value')
+        self.checkError(['--timeout', 'foo'], 'invalid timeout value:')
 
     def test_wait(self):
         ns = self.parse_args(['--wait'])
@@ -366,6 +374,44 @@ class ParseArgsTestCase(unittest.TestCase):
         self.checkError(['--unknown-option'],
                         'unrecognized arguments: --unknown-option')
 
+    def check_ci_mode(self, args, use_resources):
+        ns = cmdline._parse_args(args)
+        if utils.MS_WINDOWS:
+            self.assertTrue(ns.nowindows)
+
+        # Check Regrtest attributes which are more reliable than Namespace
+        # which has an unclear API
+        regrtest = main.Regrtest(ns)
+        self.assertNotEqual(regrtest.num_workers, 0)
+        self.assertTrue(regrtest.want_rerun)
+        self.assertTrue(regrtest.randomize)
+        self.assertIsNone(regrtest.random_seed)
+        self.assertTrue(regrtest.fail_env_changed)
+        self.assertTrue(regrtest.fail_rerun)
+        self.assertTrue(regrtest.print_slowest)
+        self.assertTrue(regrtest.output_on_failure)
+        self.assertEqual(sorted(regrtest.use_resources), sorted(use_resources))
+        return regrtest
+
+    def test_fast_ci(self):
+        args = ['--fast-ci']
+        use_resources = sorted(cmdline.ALL_RESOURCES)
+        use_resources.remove('cpu')
+        regrtest = self.check_ci_mode(args, use_resources)
+        self.assertEqual(regrtest.timeout, 10 * 60)
+
+    def test_fast_ci_resource(self):
+        # it should be possible to override resources
+        args = ['--fast-ci', '-u', 'network']
+        use_resources = ['network']
+        self.check_ci_mode(args, use_resources)
+
+    def test_slow_ci(self):
+        args = ['--slow-ci']
+        use_resources = sorted(cmdline.ALL_RESOURCES)
+        regrtest = self.check_ci_mode(args, use_resources)
+        self.assertEqual(regrtest.timeout, 20 * 60)
+
 
 @dataclasses.dataclass(slots=True)
 class Rerun: