test.py: Move get configured modes to common lib

This will allow using this method inside the test module for pytest launching the boost and unit tests

test.py

@@ -42,7 +42,7 @@ from test.pylib.pool import Pool
 from test.pylib.s3_proxy import S3ProxyServer
 from test.pylib.s3_server_mock import MockS3Server
 from test.pylib.resource_gather import setup_cgroup, run_resource_watcher, get_resource_gather
-from test.pylib.util import LogPrefixAdapter
+from test.pylib.util import LogPrefixAdapter, get_configured_modes, ninja
 from test.pylib.scylla_cluster import ScyllaServer, ScyllaCluster, get_cluster_manager, merge_cmdline_options
 from test.pylib.minio_server import MinioServer
 from typing import Dict, List, Callable, Any, Iterable, Optional, Awaitable, Union
@@ -167,15 +167,6 @@ def path_to(mode, *components):
     return os.path.join(build_dir, mode, *components)
 
 
-def ninja(target):
-    """Build specified target using ninja"""
-    build_dir = 'build'
-    args = ['ninja', target]
-    if os.path.exists(os.path.join(build_dir, 'build.ninja')):
-        args = ['ninja', '-C', build_dir, target]
-    return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].decode()
-
-
 class TestSuite(ABC):
     """A test suite is a folder with tests of the same type.
     E.g. it can be unit tests, boost tests, or CQL tests."""
@@ -1786,11 +1777,7 @@ def parse_cmd_line() -> argparse.Namespace:
 
     if not args.modes:
         try:
-            out = ninja('mode_list')
-            # [1/1] List configured modes
-            # debug release dev
-            args.modes = re.sub(r'.* List configured modes\n(.*)\n', r'\1',
-                                out, count=1, flags=re.DOTALL).split("\n")[-1].split(' ')
+            args.modes = get_configured_modes()
         except Exception:
             print(palette.fail("Failed to read output of `ninja mode_list`: please run ./configure.py first"))
             raise

test/pylib/util.py

@@ -3,6 +3,8 @@
 #
 # SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
 #
+import re
+import subprocess
 from collections.abc import Coroutine
 import threading
 import time
@@ -10,7 +12,8 @@ import asyncio
 import logging
 import pathlib
 import os
-import pytest
+from functools import cache
+
 import random
 import string
 
@@ -255,3 +258,21 @@ async def wait_for_first_completed(coros: list[Coroutine]):
         t.cancel()
     for t in done:
         await t
+
+
+def ninja(target):
+    """Build specified target using ninja"""
+    build_dir = 'build'
+    args = ['ninja', target]
+    if os.path.exists(os.path.join(build_dir, 'build.ninja')):
+        args = ['ninja', '-C', build_dir, target]
+    return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].decode()
+
+
+@cache
+def get_configured_modes():
+    out = ninja('mode_list')
+    # [1/1] List configured modes
+    # debug release dev
+    return re.sub(r'.* List configured modes\n(.*)\n', r'\1',
+                            out, count=1, flags=re.DOTALL).split('\n')[-1].split(' ')