Merge #11858: qa: Prepare tests for Windows

faefd29 qa: Prepare functional tests for Windows (MarcoFalke)

Pull request description:

  * Pass `sys.executable` when calling a python script via the subprocess
    module
  * Don't remove the log file while it is still open and written to
  * Properly use os.pathsep and os.path.sep when modifying the PATH
    environment variable
  * util-tests: Use os.path.join for Windows compatibility

  Ref:  #8227

Tree-SHA512: c507a536af104b3bde4366b6634099db826532bd3e7c35d694b5883c550920643b3eab79c76703ca67e1044ed09979e855088f7324321c8d52112514e334d614

test/functional/test_framework/test_framework.py

@@ -99,7 +99,9 @@ class BitcoinTestFramework():
 
         PortSeed.n = self.options.port_seed
 
-        os.environ['PATH'] = self.options.srcdir + ":" + self.options.srcdir + "/qt:" + os.environ['PATH']
+        os.environ['PATH'] = self.options.srcdir + os.pathsep + \
+                             self.options.srcdir + os.path.sep + "qt" + os.pathsep + \
+                             os.environ['PATH']
 
         check_json_precision()
 
@@ -148,10 +150,11 @@ class BitcoinTestFramework():
             self.log.info("Note: bitcoinds were not stopped and may still be running")
 
         if not self.options.nocleanup and not self.options.noshutdown and success != TestStatus.FAILED:
-            self.log.info("Cleaning up")
-            shutil.rmtree(self.options.tmpdir)
+            self.log.info("Cleaning up {} on exit".format(self.options.tmpdir))
+            cleanup_tree_on_exit = True
         else:
             self.log.warning("Not cleaning up dir %s" % self.options.tmpdir)
+            cleanup_tree_on_exit = False
 
         if success == TestStatus.PASSED:
             self.log.info("Tests successful")
@@ -164,6 +167,8 @@ class BitcoinTestFramework():
             self.log.error("Hint: Call {} '{}' to consolidate all logs".format(os.path.normpath(os.path.dirname(os.path.realpath(__file__)) + "/../combine_logs.py"), self.options.tmpdir))
             exit_code = TEST_EXIT_FAILED
         logging.shutdown()
+        if cleanup_tree_on_exit:
+            shutil.rmtree(self.options.tmpdir)
         sys.exit(exit_code)
 
     # Methods to override in subclass test scripts.