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      $ENV{PAR_TEMP} = $stmpdir;
    mkdir $stmpdir, 0700;

    $PARTemp = $1 if defined $ENV{PAR_TEMP} and $ENV{PAR_TEMP} =~ /(.+)/;
}

# Find any digester
# Used in PAR::Repository::Client!
sub _get_digester {
  my $ctx = eval { require Digest::SHA; Digest::SHA->new(1) }
         || eval { require Digest::SHA1; Digest::SHA1->new }
         || eval { require Digest::MD5; Digest::MD5->new };
  return $ctx;
}

# find the per-user temporary directory (eg /tmp/par-$USER)
# Used in PAR::Repository::Client!
sub _get_par_user_tempdir {
  my $username = _find_username();
  my $temp_path;
  foreach my $path (
    (map $ENV{$_}, qw( PAR_TMPDIR TMPDIR TEMPDIR TEMP TMP )),
      qw( C:\\TEMP /tmp . )
  ) {
    next unless defined $path and -d $path and -w $path;
    # create a temp directory that is unique per user
    # NOTE: $username may be in an unspecified charset/encoding;
    # use a name that hopefully works for all of them;
    # also avoid problems with platform-specific meta characters in the name
    $temp_path = File::Spec->catdir($path, "par-".unpack("H*", $username));
    ($temp_path) = $temp_path =~ /^(.*)$/s;
    unless (mkdir($temp_path, 0700) || $!{EEXIST}) {
      warn "creation of private subdirectory $temp_path failed (errno=$!)"; 
      return;
    }

    unless ($^O eq 'MSWin32') {
        my @st;
        unless (@st = lstat($temp_path)) {
          warn "stat of private subdirectory $temp_path failed (errno=$!)";
          return;
        }
        if (!S_ISDIR($st[2])
            || $st[4] != $<
            || ($st[2] & 0777) != 0700 ) {
          warn "private subdirectory $temp_path is unsafe (please remove it and retry your operation)";
          return;
        }
    }

    last;
  }
  return $temp_path;
}

# tries hard to find out the name of the current user
sub _find_username {
  my $username;
  my $pwuid;
  # does not work everywhere:
  eval {($pwuid) = getpwuid($>) if defined $>;};

  if ( defined(&Win32::LoginName) ) {
    $username = &Win32::LoginName;
  }
  elsif (defined $pwuid) {
    $username = $pwuid;
  }
  else {
    $username = $ENV{USERNAME} || $ENV{USER} || 'SYSTEM';
  }

  return $username;
}

1;

__END__

=head1 SEE ALSO

L<PAR>, L<PAR::Environment>

=head1 AUTHORS

Audrey Tang E<lt>cpan@audreyt.orgE<gt>,
Steffen Mueller E<lt>smueller@cpan.orgE<gt>

You can write
to the mailing list at E<lt>par@perl.orgE<gt>, or send an empty mail to
E<lt>par-subscribe@perl.orgE<gt> to participate in the discussion.
Archives of the mailing list are available at
E<lt>https://www.mail-archive.com/par@perl.org/E<gt> or E<lt>https://groups.google.com/g/perl.parE<gt>.

Please submit bug reports to E<lt>https://github.com/rschupp/PAR/issuesE<gt>. If you need
support, however, joining the E<lt>par@perl.orgE<gt> mailing list is
preferred.

=head1 COPYRIGHT

Copyright 2002-2010 by Audrey Tang E<lt>cpan@audreyt.orgE<gt>.

Copyright 2006-2010 by Steffen Mueller E<lt>smueller@cpan.orgE<gt>.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

See F<LICENSE>.

=cut