git-svn: allow git-svn fetching to work using serf

When attempting to git-svn fetch files from an svn https?: url using
the serf library (the only choice starting with svn 1.8) the following
errors can occur:

Temp file with moniker 'svn_delta' already in use at Git.pm line 1250
Temp file with moniker 'git_blob' already in use at Git.pm line 1250

David Rothenberger <daveroth@acm.org> has determined the cause to
be that ra_serf does not drive the delta editor in a depth-first
manner [...]. Instead, the calls come in this order:

1. open_root
2. open_directory
3. add_file
4. apply_textdelta
5. add_file
6. apply_textdelta

When using the ra_serf access method, git-svn can end up needing
to create several temp files before the first one is closed.

This change causes a new temp file moniker to be generated if the
one that would otherwise have been used is currently locked.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/perl/Git/SVN/Fetcher.pm b/perl/Git/SVN/Fetcher.pm
index bd174189b98fda05f781697be26db94c9cd53364..10edb27732f439e5290a7b354efefeb10d219669 100644 (file)
--- a/perl/Git/SVN/Fetcher.pm
+++ b/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);