gh-109615: Fix test_tools.test_freeze SRCDIR

* Use sysconfig to get the source directory.
* Use sysconfig.get_config_var() to get CONFIG_ARGS variable.

Author: vstinner

Lib/test/libregrtest/utils.py

@@ -355,7 +355,7 @@ def get_temp_dir(tmp_dir: StrPath | None = None) -> StrPath:
             if not support.is_wasi:
                 tmp_dir = sysconfig.get_config_var('abs_builddir')
                 if tmp_dir is None:
-                    # bpo-30284: On Windows, only srcdir is available. Using
+                    # gh-74470: On Windows, only srcdir is available. Using
                     # abs_builddir mostly matters on UNIX when building Python
                     # out of the source tree, especially when the source tree
                     # is read only.

Tools/freeze/test/freeze.py

@@ -1,14 +1,22 @@
 import os
 import os.path
-import re
 import shlex
 import shutil
 import subprocess
+import sysconfig
+
+
+def get_source_dir():
+    src_dir = sysconfig.get_config_var('abs_builddir')
+    if src_dir is None:
+        # gh-74470: On Windows, only srcdir is available.
+        src_dir = sysconfig.get_config_var('srcdir')
+    return os.path.abspath(src_dir)
 
 
 TESTS_DIR = os.path.dirname(__file__)
 TOOL_ROOT = os.path.dirname(TESTS_DIR)
-SRCDIR = os.path.dirname(os.path.dirname(TOOL_ROOT))
+SRCDIR = get_source_dir()
 
 MAKE = shutil.which('make')
 FREEZE = os.path.join(TOOL_ROOT, 'freeze.py')
@@ -75,7 +83,7 @@ def ensure_opt(args, name, value):
 
 
 def copy_source_tree(newroot, oldroot):
-    print(f'copying the source tree into {newroot}...')
+    print(f'copying the source tree {oldroot} into {newroot}...')
     if os.path.exists(newroot):
         if newroot == SRCDIR:
             raise Exception('this probably isn\'t what you wanted')
@@ -97,34 +105,6 @@ def ignore_non_src(src, names):
         _run_quiet([MAKE, 'clean'], newroot)
 
 
-def get_makefile_var(builddir, name):
-    regex = re.compile(rf'^{name} *=\s*(.*?)\s*$')
-    filename = os.path.join(builddir, 'Makefile')
-    try:
-        infile = open(filename, encoding='utf-8')
-    except FileNotFoundError:
-        return None
-    with infile:
-        for line in infile:
-            m = regex.match(line)
-            if m:
-                value, = m.groups()
-                return value or ''
-    return None
-
-
-def get_config_var(builddir, name):
-    python = os.path.join(builddir, 'python')
-    if os.path.isfile(python):
-        cmd = [python, '-c',
-               f'import sysconfig; print(sysconfig.get_config_var("{name}"))']
-        try:
-            return _run_stdout(cmd)
-        except subprocess.CalledProcessError:
-            pass
-    return get_makefile_var(builddir, name)
-
-
 ##################################
 # freezing
 
@@ -151,10 +131,8 @@ def prepare(script=None, outdir=None):
 
     # Run configure.
     print(f'configuring python in {builddir}...')
-    cmd = [
-        os.path.join(srcdir, 'configure'),
-        *shlex.split(get_config_var(SRCDIR, 'CONFIG_ARGS') or ''),
-    ]
+    config_args = shlex.split(sysconfig.get_config_var(SRCDIR, 'CONFIG_ARGS') or '')
+    cmd = [os.path.join(srcdir, 'configure'), *config_args]
     ensure_opt(cmd, 'cache-file', os.path.join(outdir, 'python-config.cache'))
     prefix = os.path.join(outdir, 'python-installation')
     ensure_opt(cmd, 'prefix', prefix)