Don't checkout the full tree if avoidable

In most cases of branching, the tree is copied unmodified from the trunk
to the branch.  When that is done, we can simply start with the parent's
index and apply the changes on the branch as usual.

[ew: rewritten from Steven's original to use SVN::Client instead
     of the command-line svn client.

     Since SVN::Client connects separately, we'll share our
     authentication providers array between our usages of
     SVN::Client and SVN::Ra, too.  Bypassing the high-level
     SVN::Client library can avoid this, but the code will be
     much more complex.  Regardless, any implementation of this
     seems to require restarting a connection to the remote
     server.

     Also of note is that SVN 1.4 and later allows a more
     efficient diff_summary to be done instead of a full diff,
     but since this code is only to support SVN < 1.4.4, we'll
     ignore it for now.]

Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-svn.perl

@@ -1847,6 +1847,16 @@ sub find_parent_branch {
 			$gs->ra->gs_do_switch($r0, $rev, $gs,
 					      $self->full_url, $ed)
 			  or die "SVN connection failed somewhere...\n";
+		} elsif ($self->ra->trees_match($new_url, $r0,
+			                        $self->full_url, $rev)) {
+			print STDERR "Trees match:\n",
+			             "  $new_url\@$r0\n",
+			             "  ${\$self->full_url}\@$rev\n",
+				     "Following parent with no changes\n";
+			$self->tmp_index_do(sub {
+			    command_noisy('read-tree', $parent);
+			});
+			$self->{last_commit} = $parent;
 		} else {
 			print STDERR "Following parent with do_update\n";
 			$ed = SVN::Git::Fetcher->new($self);
@@ -3027,28 +3037,32 @@ BEGIN {
 	}
 }
 
+sub _auth_providers () {
+	[
+	  SVN::Client::get_simple_provider(),
+	  SVN::Client::get_ssl_server_trust_file_provider(),
+	  SVN::Client::get_simple_prompt_provider(
+	    \&Git::SVN::Prompt::simple, 2),
+	  SVN::Client::get_ssl_client_cert_file_provider(),
+	  SVN::Client::get_ssl_client_cert_prompt_provider(
+	    \&Git::SVN::Prompt::ssl_client_cert, 2),
+	  SVN::Client::get_ssl_client_cert_pw_prompt_provider(
+	    \&Git::SVN::Prompt::ssl_client_cert_pw, 2),
+	  SVN::Client::get_username_provider(),
+	  SVN::Client::get_ssl_server_trust_prompt_provider(
+	    \&Git::SVN::Prompt::ssl_server_trust),
+	  SVN::Client::get_username_prompt_provider(
+	    \&Git::SVN::Prompt::username, 2)
+	]
+}
+
 sub new {
 	my ($class, $url) = @_;
 	$url =~ s!/+$!!;
 	return $RA if ($RA && $RA->{url} eq $url);
 
 	SVN::_Core::svn_config_ensure($config_dir, undef);
-	my ($baton, $callbacks) = SVN::Core::auth_open_helper([
-	    SVN::Client::get_simple_provider(),
-	    SVN::Client::get_ssl_server_trust_file_provider(),
-	    SVN::Client::get_simple_prompt_provider(
-	      \&Git::SVN::Prompt::simple, 2),
-	    SVN::Client::get_ssl_client_cert_file_provider(),
-	    SVN::Client::get_ssl_client_cert_prompt_provider(
-	      \&Git::SVN::Prompt::ssl_client_cert, 2),
-	    SVN::Client::get_ssl_client_cert_pw_prompt_provider(
-	      \&Git::SVN::Prompt::ssl_client_cert_pw, 2),
-	    SVN::Client::get_username_provider(),
-	    SVN::Client::get_ssl_server_trust_prompt_provider(
-	      \&Git::SVN::Prompt::ssl_server_trust),
-	    SVN::Client::get_username_prompt_provider(
-	      \&Git::SVN::Prompt::username, 2),
-	  ]);
+	my ($baton, $callbacks) = SVN::Core::auth_open_helper(_auth_providers);
 	my $config = SVN::Core::config_get_config($config_dir);
 	$RA = undef;
 	my $self = SVN::Ra->new(url => $url, auth => $baton,
@@ -3112,6 +3126,24 @@ sub get_log {
 	$ret;
 }
 
+sub trees_match {
+	my ($self, $url1, $rev1, $url2, $rev2) = @_;
+	my $ctx = SVN::Client->new(auth => _auth_providers);
+	my $out = IO::File->new_tmpfile;
+
+	# older SVN (1.1.x) doesn't take $pool as the last parameter for
+	# $ctx->diff(), so we'll create a default one
+	my $pool = SVN::Pool->new_default_sub;
+
+	$ra_invalid = 1; # this will open a new SVN::Ra connection to $url1
+	$ctx->diff([], $url1, $rev1, $url2, $rev2, 1, 1, 0, $out, $out);
+	$out->flush;
+	my $ret = (($out->stat)[7] == 0);
+	close $out or croak $!;
+
+	$ret;
+}
+
 sub get_commit_editor {
 	my ($self, $log, $cb, $pool) = @_;
 	my @lock = $SVN::Core::VERSION ge '1.2.0' ? (undef, 0) : ();