Remove reset of testtablespace from pg_regress on Windows

testtablespace is an extra path used as tablespace location in the main
regression test suite, computed from --outputdir as defined by the
caller of pg_regress (current directory if undefined).

This special handling was introduced as of f10589e5 to be specific to
MSVC, as we let pg_regress' Makefile handle this cleanup in other
environments.  This moves the cleanup to the MSVC script running
regression tests instead where needed: check, installcheck and
upgradecheck.  I have also checked this patch on MSVC with repeated runs
of each target.

Author: Kyotaro Horiguchi, Michael Paquier
Discussion: https://postgr.es/m/20200219.142519.437573253063431435.horikyota.ntt@gmail.com

src/test/regress/pg_regress.c

@@ -494,28 +494,6 @@ convert_sourcefiles_in(const char *source_subdir, const char *dest_dir, const ch
 
 	snprintf(testtablespace, MAXPGPATH, "%s/testtablespace", outputdir);
 
-#ifdef WIN32
-
-	/*
-	 * On Windows only, clean out the test tablespace dir, or create it if it
-	 * doesn't exist.  On other platforms we expect the Makefile to take care
-	 * of that.  (We don't migrate that functionality in here because it'd be
-	 * harder to cope with platform-specific issues such as SELinux.)
-	 *
-	 * XXX it would be better if pg_regress.c had nothing at all to do with
-	 * testtablespace, and this were handled by a .BAT file or similar on
-	 * Windows.  See pgsql-hackers discussion of 2008-01-18.
-	 */
-	if (directory_exists(testtablespace))
-		if (!rmtree(testtablespace, true))
-		{
-			fprintf(stderr, _("\n%s: could not remove test tablespace \"%s\"\n"),
-					progname, testtablespace);
-			exit(2);
-		}
-	make_directory(testtablespace);
-#endif
-
 	/* finally loop on each file and do the replacement */
 	for (name = names; *name; name++)
 	{

src/tools/msvc/vcregress.pl

@@ -123,6 +123,8 @@ sub installcheck_internal
 sub installcheck
 {
 	my $schedule = shift || 'serial';
+
+	CleanupTablespaceDirectory();
 	installcheck_internal($schedule);
 	return;
 }
@@ -143,6 +145,7 @@ sub check
 		"--temp-instance=./tmp_check");
 	push(@args, $maxconn)     if $maxconn;
 	push(@args, $temp_config) if $temp_config;
+	CleanupTablespaceDirectory();
 	system(@args);
 	my $status = $? >> 8;
 	exit $status if $status;
@@ -570,8 +573,8 @@ sub upgradecheck
 	$ENV{PGDATA} = "$data.old";
 	my $outputdir          = "$tmp_root/regress";
 	my @EXTRA_REGRESS_OPTS = ("--outputdir=$outputdir");
-	mkdir "$outputdir"                || die $!;
-	mkdir "$outputdir/testtablespace" || die $!;
+	mkdir "$outputdir" || die $!;
+	CleanupTablespaceDirectory($outputdir);
 
 	my $logdir = "$topdir/src/bin/pg_upgrade/log";
 	rmtree($logdir);
@@ -737,6 +740,16 @@ sub InstallTemp
 	return;
 }
 
+sub CleanupTablespaceDirectory
+{
+	my $testdir = shift || getcwd();
+
+	my $testtablespace = "$testdir/testtablespace";
+
+	rmtree($testtablespace) if (-d $testtablespace);
+	mkdir($testtablespace);
+}
+
 sub usage
 {
 	print STDERR