Remove PostgreSQL::Test::Utils::perl2host completely

Commit f1ac4a74de disabled this processing, and as nothing has broken (as
expected) here we proceed to remove the routine and adjust all the call
sites.

Backpatch to release 10

Discussion: https://postgr.es/m/0ba775a2-8aa0-0d56-d780-69427cf6f33d@dunslane.net
Discussion: https://postgr.es/m/20220125023609.5ohu3nslxgoygihl@alap3.anarazel.de

src/bin/pg_basebackup/t/010_pg_basebackup.pl

@@ -239,13 +239,11 @@ $node->start;
 # for the tablespace directories, which hopefully won't run afoul of
 # the 99 character length limit.
 my $sys_tempdir = TestLib::tempdir_short;
-my $real_sys_tempdir = TestLib::perl2host($sys_tempdir) . "/tempdir";
-my $shorter_tempdir =  $sys_tempdir . "/tempdir";
-dir_symlink "$tempdir", $shorter_tempdir;
+my $real_sys_tempdir = "$sys_tempdir/tempdir";
+dir_symlink "$tempdir", $real_sys_tempdir;
 
 mkdir "$tempdir/tblspc1";
 my $realTsDir    = "$real_sys_tempdir/tblspc1";
-my $real_tempdir = TestLib::perl2host($tempdir);
 $node->safe_psql('postgres',
 	"CREATE TABLESPACE tblspc1 LOCATION '$realTsDir';");
 $node->safe_psql('postgres',
@@ -324,7 +322,7 @@ my $tblSpc1Id = basename(
 foreach my $filename (@tempRelationFiles)
 {
 	append_to_file(
-		"$shorter_tempdir/tblspc1/$tblSpc1Id/$postgresOid/$filename",
+		"$real_sys_tempdir/tblspc1/$tblSpc1Id/$postgresOid/$filename",
 		'TEMP_RELATION');
 }
 
@@ -334,9 +332,9 @@ $node->command_fails(
 
 $node->command_ok(
 	[
-		'pg_basebackup',    '-D',
-		"$tempdir/backup1", '-Fp',
-		"-T$realTsDir=$real_tempdir/tbackup/tblspc1"
+		'pg_basebackup', '-D',
+		"$tempdir/backup1",  '-Fp',
+		"-T$realTsDir=$tempdir/tbackup/tblspc1",
 	],
 	'plain format with tablespaces succeeds with tablespace mapping');
 ok(-d "$tempdir/tbackup/tblspc1", 'tablespace was relocated');
@@ -384,7 +382,7 @@ foreach my $filename (@tempRelationFiles)
 
 	# Also remove temp relation files or tablespace drop will fail.
 	my $filepath =
-	  "$shorter_tempdir/tblspc1/$tblSpc1Id/$postgresOid/$filename";
+	  "$real_sys_tempdir/tblspc1/$tblSpc1Id/$postgresOid/$filename";
 
 	unlink($filepath)
 	  or BAIL_OUT("unable to unlink $filepath");
@@ -404,9 +402,9 @@ $node->safe_psql('postgres',
 $realTsDir =~ s/=/\\=/;
 $node->command_ok(
 	[
-		'pg_basebackup',    '-D',
-		"$tempdir/backup3", '-Fp',
-		"-T$realTsDir=$real_tempdir/tbackup/tbl\\=spc2"
+		'pg_basebackup', '-D',
+		"$tempdir/backup3",  '-Fp',
+		"-T$realTsDir=$tempdir/tbackup/tbl\\=spc2",
 	],
 	'mapping tablespace with = sign in path');
 ok(-d "$tempdir/tbackup/tbl=spc2", 'tablespace with = sign was relocated');

src/bin/pg_checksums/t/002_actions.pl

@@ -190,7 +190,6 @@ check_relation_corruption($node, 'corrupt1', 'pg_default');
 my $basedir        = $node->basedir;
 my $tablespace_dir = "$basedir/ts_corrupt_dir";
 mkdir($tablespace_dir);
-$tablespace_dir = TestLib::perl2host($tablespace_dir);
 $node->safe_psql('postgres',
 	"CREATE TABLESPACE ts_corrupt LOCATION '$tablespace_dir';");
 check_relation_corruption($node, 'corrupt2', 'ts_corrupt');

src/bin/pg_verifybackup/t/003_corruption.pl

@@ -18,7 +18,7 @@ $primary->start;
 
 # Include a user-defined tablespace in the hopes of detecting problems in that
 # area.
-my $source_ts_path   = TestLib::perl2host(TestLib::tempdir_short());
+my $source_ts_path   = TestLib::tempdir_short();
 my $source_ts_prefix = $source_ts_path;
 $source_ts_prefix =~ s!(^[A-Z]:/[^/]*)/.*!$1!;
 
@@ -107,7 +107,7 @@ for my $scenario (@scenario)
 
 		# Take a backup and check that it verifies OK.
 		my $backup_path    = $primary->backup_dir . '/' . $name;
-		my $backup_ts_path = TestLib::perl2host(TestLib::tempdir_short());
+		my $backup_ts_path = TestLib::tempdir_short();
 		# The tablespace map parameter confuses Msys2, which tries to mangle
 		# it. Tell it not to.
 		# See https://www.msys2.org/wiki/Porting/#filesystem-namespaces

src/bin/pgbench/t/001_pgbench_with_server.pl

@@ -19,12 +19,10 @@ $node->start;
 # for partitioned tables.
 my $ts = $node->basedir . '/regress_pgbench_tap_1_ts_dir';
 mkdir $ts or die "cannot create directory $ts";
-# this takes care of WIN-specific path issues
-my $ets = TestLib::perl2host($ts);
 
 # the next commands will issue a syntax error if the path contains a "'"
 $node->safe_psql('postgres',
-	"CREATE TABLESPACE regress_pgbench_tap_1_ts LOCATION '$ets';");
+	"CREATE TABLESPACE regress_pgbench_tap_1_ts LOCATION '$ts';");
 
 # Test concurrent OID generation via pg_enum_oid_index.  This indirectly
 # exercises LWLock and spinlock concurrency.

src/bin/scripts/t/090_reindexdb.pl

@@ -21,7 +21,6 @@ $ENV{PGOPTIONS} = '--client-min-messages=WARNING';
 # Create a tablespace for testing.
 my $tbspace_path = $node->basedir . '/regress_reindex_tbspace';
 mkdir $tbspace_path or die "cannot create directory $tbspace_path";
-$tbspace_path = TestLib::perl2host($tbspace_path);
 my $tbspace_name = 'reindex_tbspace';
 $node->safe_psql('postgres',
 	"CREATE TABLESPACE $tbspace_name LOCATION '$tbspace_path';");

src/test/perl/PostgresNode.pm

@@ -1016,7 +1016,7 @@ primary_conninfo='$root_connstr'
 sub enable_restoring
 {
 	my ($self, $root_node, $standby) = @_;
-	my $path = TestLib::perl2host($root_node->archive_dir);
+	my $path = $root_node->archive_dir;
 	my $name = $self->name;
 
 	print "### Enabling WAL restore for node \"$name\"\n";
@@ -1084,7 +1084,7 @@ sub set_standby_mode
 sub enable_archiving
 {
 	my ($self) = @_;
-	my $path   = TestLib::perl2host($self->archive_dir);
+	my $path   = $self->archive_dir;
 	my $name   = $self->name;
 
 	print "### Enabling WAL archiving for node \"$name\"\n";

src/test/perl/TestLib.pm

@@ -24,7 +24,6 @@ TestLib - helper module for writing PostgreSQL's C<prove> tests.
 
   # Miscellanea
   print "on Windows" if $TestLib::windows_os;
-  my $path = TestLib::perl2host($backup_dir);
   ok(check_mode_recursive($stream_dir, 0700, 0600),
     "check stream dir permissions");
   TestLib::system_log('pg_ctl', 'kill', 'QUIT', $slow_pid);
@@ -298,61 +297,6 @@ sub tempdir_short
 
 =pod
 
-=item perl2host()
-
-Translate a virtual file name to a host file name.  Currently, this is a no-op
-except for the case of Perl=msys and host=mingw32.  The subject need not
-exist, but its parent or grandparent directory must exist unless cygpath is
-available.
-
-The returned path uses forward slashes but has no trailing slash.
-
-=cut
-
-sub perl2host
-{
-	my ($subject) = @_;
-	return $subject unless $Config{osname} eq 'msys';
-	if ($is_msys2)
-	{
-		# get absolute, windows type path
-		my $path = qx{cygpath -a -m "$subject"};
-		if (!$?)
-		{
-			chomp $path;
-			$path =~ s!/$!!;
-			return $path if $path;
-		}
-		# fall through if this didn't work.
-	}
-	my $here = cwd;
-	my $leaf;
-	if (chdir $subject)
-	{
-		$leaf = '';
-	}
-	else
-	{
-		$leaf = '/' . basename $subject;
-		my $parent = dirname $subject;
-		if (!chdir $parent)
-		{
-			$leaf   = '/' . basename($parent) . $leaf;
-			$parent = dirname $parent;
-			chdir $parent or die "could not chdir \"$parent\": $!";
-		}
-	}
-
-	# this odd way of calling 'pwd -W' is the only way that seems to work.
-	my $dir = qx{sh -c "pwd -W"};
-	chomp $dir;
-	$dir =~ s!/$!!;
-	chdir $here;
-	return $dir . $leaf;
-}
-
-=pod
-
 =item has_wal_read_bug()
 
 Returns true if $tmp_check is subject to a sparc64+ext4 bug that causes WAL
@@ -708,8 +652,6 @@ sub dir_symlink
 	my $newname = shift;
 	if ($windows_os)
 	{
-		$oldname = perl2host($oldname);
-		$newname = perl2host($newname);
 		$oldname =~ s,/,\\,g;
 		$newname =~ s,/,\\,g;
 		my $cmd = qq{mklink /j "$newname" "$oldname"};

src/test/recovery/t/014_unlogged_reinit.pl

@@ -33,9 +33,7 @@ ok(-f "$pgdata/$baseUnloggedPath",        'main fork in base exists');
 
 my $tablespaceDir = TestLib::tempdir;
 
-my $realTSDir = TestLib::perl2host($tablespaceDir);
-
-$node->safe_psql('postgres', "CREATE TABLESPACE ts1 LOCATION '$realTSDir'");
+$node->safe_psql('postgres', "CREATE TABLESPACE ts1 LOCATION '$tablespaceDir'");
 $node->safe_psql('postgres',
 	'CREATE UNLOGGED TABLE ts1_unlogged (id int) TABLESPACE ts1');
 

src/test/recovery/t/017_shm.pl

@@ -116,7 +116,7 @@ log_ipcs();
 $gnat->start;
 log_ipcs();
 
-my $regress_shlib = TestLib::perl2host($ENV{REGRESS_SHLIB});
+my $regress_shlib = $ENV{REGRESS_SHLIB};
 $gnat->safe_psql('postgres', <<EOSQL);
 CREATE FUNCTION wait_pid(int)
    RETURNS void

src/test/recovery/t/018_wal_optimize.pl

@@ -60,7 +60,6 @@ wal_skip_threshold = 0
 	# Setup
 	my $tablespace_dir = $node->basedir . '/tablespace_other';
 	mkdir($tablespace_dir);
-	$tablespace_dir = TestLib::perl2host($tablespace_dir);
 	my $result;
 
 	# Test redo of CREATE TABLESPACE.
@@ -152,7 +151,6 @@ wal_skip_threshold = 0
 		$copy_file, qq(20000,30000
 20001,30001
 20002,30002));
-	$copy_file = TestLib::perl2host($copy_file);
 
 	# Test truncation with inserted tuples using both INSERT and COPY.  Tuples
 	# inserted after the truncation should be seen.

src/test/recovery/t/025_stuck_on_old_timeline.pl

@@ -28,7 +28,7 @@ $node_primary->init(allows_streaming => 1, has_archiving => 1);
 # Note: consistent use of forward slashes here avoids any escaping problems
 # that arise from use of backslashes. That means we need to double-quote all
 # the paths in the archive_command
-my $perlbin = TestLib::perl2host($^X);
+my $perlbin = $^X;
 $perlbin =~ s!\\!/!g if $TestLib::windows_os;
 my $archivedir_primary = $node_primary->archive_dir;
 $archivedir_primary =~ s!\\!/!g if $TestLib::windows_os;