Add --tempdir option for test run (GH-10322)

(cherry picked from commit 38df97a03c)

Co-authored-by: Steve Dower <steve.dower@microsoft.com>

.azure-pipelines/windows-steps.yml

@@ -17,7 +17,7 @@ steps:
 - script: python.bat -m test.pythoninfo
   displayName: 'Display build info'
 
-- script: PCbuild\rt.bat -q -uall -u-cpu -rwW --slowest --timeout=1200 -j0 --junit-xml="$(Build.BinariesDirectory)\test-results.xml"
+- script: PCbuild\rt.bat -q -uall -u-cpu -rwW --slowest --timeout=1200 -j0 --junit-xml="$(Build.BinariesDirectory)\test-results.xml" --tempdir="$(Build.BinariesDirectory)\test"
   displayName: 'Tests'
   env:
     PREFIX: $(Py_OutDir)\$(arch)

Lib/test/libregrtest/cmdline.py

@@ -271,7 +271,8 @@ def _create_parser():
     group.add_argument('--junit-xml', dest='xmlpath', metavar='FILENAME',
                        help='writes JUnit-style XML results to the specified '
                             'file')
-
+    group.add_argument('--tempdir', dest='tempdir', metavar='PATH',
+                       help='override the working directory for the test run')
     return parser
 
 
@@ -383,8 +384,7 @@ def _parse_args(args, **kwargs):
     if ns.match_filename:
         if ns.match_tests is None:
             ns.match_tests = []
-        filename = os.path.join(support.SAVEDCWD, ns.match_filename)
-        with open(filename) as fp:
+        with open(ns.match_filename) as fp:
             for line in fp:
                 ns.match_tests.append(line.strip())
 

Lib/test/libregrtest/main.py

@@ -550,12 +550,12 @@ class Regrtest:
 
     def main(self, tests=None, **kwargs):
         global TEMPDIR
+        self.ns = self.parse_args(kwargs)
 
-        if sysconfig.is_python_build():
-            try:
-                os.mkdir(TEMPDIR)
-            except FileExistsError:
-                pass
+        if self.ns.tempdir:
+            TEMPDIR = self.ns.tempdir
+
+        os.makedirs(TEMPDIR, exist_ok=True)
 
         # Define a writable temp dir that will be used as cwd while running
         # the tests. The name of the dir includes the pid to allow parallel
@@ -571,8 +571,6 @@ class Regrtest:
             self._main(tests, kwargs)
 
     def _main(self, tests, kwargs):
-        self.ns = self.parse_args(kwargs)
-
         if self.ns.huntrleaks:
             warmup, repetitions, _ = self.ns.huntrleaks
             if warmup < 1 or repetitions < 1: