git-svn: allow --log-window-size to be specified, default to 100

The newer default value should should lower memory usage for
large fetches and also help with fetching from less reliable
servers.  Previously the value was 1000 and memory usage
got a bit high on some repositories and fetching became
less reliable in some cases.
Signed-off-by: NEric Wong <normalperson@yhbt.net>

git-svn.perl

@@ -12,6 +12,7 @@
 $ENV{GIT_DIR} ||= '.git';
 $Git::SVN::default_repo_id = 'svn';
 $Git::SVN::default_ref_id = $ENV{GIT_SVN_ID} || 'git-svn';
+$Git::SVN::Ra::_log_window_size = 100;
 
 $Git::SVN::Log::TZ = $ENV{TZ};
 $ENV{TZ} = 'UTC';
@@ -65,6 +66,7 @@ BEGIN
 		'repack:i' => \$Git::SVN::_repack,
 		'noMetadata' => \$Git::SVN::_no_metadata,
 		'useSvmProps' => \$Git::SVN::_use_svm_props,
+		'log-window-size=i' => \$Git::SVN::Ra::_log_window_size,
 		'quiet|q' => \$_q,
 		'repack-flags|repack-args|repack-opts=s' =>
 		   \$Git::SVN::_repack_flags,
@@ -2583,7 +2585,7 @@ sub apply_diff {
 }
 
 package Git::SVN::Ra;
-use vars qw/@ISA $config_dir/;
+use vars qw/@ISA $config_dir $_log_window_size/;
 use strict;
 use warnings;
 my ($can_do_switch);
@@ -2747,7 +2749,7 @@ sub gs_do_switch {
 sub gs_fetch_loop_common {
 	my ($self, $base, $head, $gsv, $globs) = @_;
 	return if ($base > $head);
-	my $inc = 1000;
+	my $inc = $_log_window_size;
 	my ($min, $max) = ($base, $head < $base + $inc ? $head : $base + $inc);
 	my %common;
 	my $common_max = scalar @$gsv;
@@ -2954,6 +2956,9 @@ sub skip_unknown_revs {
 	# 175007 - http(s):// (this repo required authorization, too...)
 	#   More codes may be discovered later...
 	if ($errno == 175007 || $errno == 175002 || $errno == 160013) {
+		warn "W: Ignoring error from SVN, path probably ",
+		     "does not exist: ($errno): ",
+		     $err->expanded_message,"\n";
 		return;
 	}
 	die "Error from SVN, ($errno): ", $err->expanded_message,"\n";