Merge branch 'km/svn-1.8-serf-only' into maint

* km/svn-1.8-serf-only:
  Git.pm: revert _temp_cache use of temp_is_locked
  git-svn: allow git-svn fetching to work using serf
  Git.pm: add new temp_is_locked function

perl/Git.pm

@@ -61,7 +61,7 @@ =head1 SYNOPSIS
                 remote_refs prompt
                 get_tz_offset
                 credential credential_read credential_write
-                temp_acquire temp_release temp_reset temp_path);
+                temp_acquire temp_is_locked temp_release temp_reset temp_path);
 
 
 =head1 DESCRIPTION
@@ -1206,6 +1206,35 @@ sub temp_acquire {
 	$temp_fd;
 }
 
+=item temp_is_locked ( NAME )
+
+Returns true if the internal lock created by a previous C<temp_acquire()>
+call with C<NAME> is still in effect.
+
+When temp_acquire is called on a C<NAME>, it internally locks the temporary
+file mapped to C<NAME>.  That lock will not be released until C<temp_release()>
+is called with either the original C<NAME> or the L<File::Handle> that was
+returned from the original call to temp_acquire.
+
+Subsequent attempts to call C<temp_acquire()> with the same C<NAME> will fail
+unless there has been an intervening C<temp_release()> call for that C<NAME>
+(or its corresponding L<File::Handle> that was returned by the original
+C<temp_acquire()> call).
+
+If true is returned by C<temp_is_locked()> for a C<NAME>, an attempt to
+C<temp_acquire()> the same C<NAME> will cause an error unless
+C<temp_release> is first called on that C<NAME> (or its corresponding
+L<File::Handle> that was returned by the original C<temp_acquire()> call).
+
+=cut
+
+sub temp_is_locked {
+	my ($self, $name) = _maybe_self(@_);
+	my $temp_fd = \$TEMP_FILEMAP{$name};
+
+	defined $$temp_fd && $$temp_fd->opened && $TEMP_FILES{$$temp_fd}{locked};
+}
+
 =item temp_release ( NAME )
 
 =item temp_release ( FILEHANDLE )

perl/Git/SVN/Fetcher.pm

@@ -315,11 +315,13 @@ sub change_file_prop {
 sub apply_textdelta {
 	my ($self, $fb, $exp) = @_;
 	return undef if $self->is_path_ignored($fb->{path});
-	my $fh = $::_repository->temp_acquire('svn_delta');
+	my $suffix = 0;
+	++$suffix while $::_repository->temp_is_locked("svn_delta_${$}_$suffix");
+	my $fh = $::_repository->temp_acquire("svn_delta_${$}_$suffix");
 	# $fh gets auto-closed() by SVN::TxDelta::apply(),
 	# (but $base does not,) so dup() it for reading in close_file
 	open my $dup, '<&', $fh or croak $!;
-	my $base = $::_repository->temp_acquire('git_blob');
+	my $base = $::_repository->temp_acquire("git_blob_${$}_$suffix");
 
 	if ($fb->{blob}) {
 		my ($base_is_link, $size);