Subject: [PATCH] git-svn: make batch mode optional for git-cat-file

From: Victor Leschuk <[email-masked]>
Date: Mon, 21 Sep 2015 16:51:38 +0300

Signed-off-by: Victor Leschuk <[email-masked]>
---
 git-svn.perl |  1 +
 perl/Git.pm  | 41 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/git-svn.perl b/git-svn.perl
index 36f7240..b793c26 100755
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -139,6 +139,7 @@ my %fc_opts = ( 'follow-parent|follow!' => \$Git::SVN::_follow_parent,
 		'use-log-author' => \$Git::SVN::_use_log_author,
 		'add-author-from' => \$Git::SVN::_add_author_from,
 		'localtime' => \$Git::SVN::_localtime,
+		'no-cat-file-batch' => sub { $Git::no_cat_file_batch = 1; },
 		%remote_opts );
 
 my ($_trunk, @_tags, @_branches, $_stdlayout);
diff --git a/perl/Git.pm b/perl/Git.pm
index 19ef081..69e5293 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -107,6 +107,7 @@ use Fcntl qw(SEEK_SET SEEK_CUR);
 use Time::Local qw(timegm);
 }
 
+our $no_cat_file_batch = 0;
 
 =head1 CONSTRUCTORS
 
@@ -1012,6 +1013,10 @@ returns the number of bytes printed.
 =cut
 
 sub cat_blob {
+	(1 == $no_cat_file_batch) ? _cat_blob_cmd(@_) : _cat_blob_batch(@_);
+}
+
+sub _cat_blob_batch {
 	my ($self, $sha1, $fh) = @_;
 
 	$self->_open_cat_blob_if_needed();
@@ -1072,7 +1077,7 @@ sub cat_blob {
 sub _open_cat_blob_if_needed {
 	my ($self) = @_;
 
-	return if defined($self->{cat_blob_pid});
+	return if ( defined($self->{cat_blob_pid}) || 1 == $no_cat_file_batch );
 
 	($self->{cat_blob_pid}, $self->{cat_blob_in},
 	 $self->{cat_blob_out}, $self->{cat_blob_ctx}) =
@@ -1090,6 +1095,40 @@ sub _close_cat_blob {
 	delete @$self{@vars};
 }
 
+sub _cat_blob_cmd {
+	my ($self, $sha1, $fh) = @_;
+
+	my $size = $self->command_oneline('cat-file', '-s', $sha1);
+
+	if (!defined $size) {
+		carp "cat-file couldn't detect object size";
+		return -1;
+	}
+
+	my ($in, $c) = $self->command_output_pipe('cat-file', 'blob', $sha1);
+
+	my $blob;
+	my $bytesLeft = $size;
+
+	while (1) {
+		last unless $bytesLeft;
+
+		my $bytesToRead = $bytesLeft < 1024 ? $bytesLeft : 1024;
+		my $read = read($in, $blob, $bytesToRead);
+		unless (defined($read)) {
+			$self->command_close_pipe($in, $c);
+			throw Error::Simple("in pipe went bad");
+		}
+		unless (print $fh $blob) {
+			$self->command_close_pipe($in, $c);
+			throw Error::Simple("couldn't write to passed in filehandle");
+		}
+		$bytesLeft -= $read;
+	}
+
+	$self->command_close_pipe($in, $c);
+	return $size;
+}
 
 =item credential_read( FILEHANDLE )