contrib/git-svn: avoid re-reading the repository uuid, it never changes

If it does change, we're screwed anyways as SVN will refuse to
commit or update.  We also never access more than one SVN
repository per-invocation, so we can store it as a global, too.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

contrib/git-svn/git-svn.perl

@@ -4,7 +4,7 @@
 use warnings;
 use strict;
 use vars qw/	$AUTHOR $VERSION
-		$SVN_URL $SVN_INFO $SVN_WC
+		$SVN_URL $SVN_INFO $SVN_WC $SVN_UUID
 		$GIT_SVN_INDEX $GIT_SVN
 		$GIT_DIR $REV_DIR/;
 $AUTHOR = 'Eric Wong <normalperson@yhbt.net>';
@@ -114,7 +114,6 @@ sub version {
 
 sub rebuild {
 	$SVN_URL = shift or undef;
-	my $repo_uuid;
 	my $newest_rev = 0;
 	if ($_upgrade) {
 		sys('git-update-ref',"refs/remotes/$GIT_SVN","$GIT_SVN-HEAD");
@@ -150,7 +149,7 @@ sub rebuild {
 
 		# if we merged or otherwise started elsewhere, this is
 		# how we break out of it
-		next if (defined $repo_uuid && ($uuid ne $repo_uuid));
+		next if (defined $SVN_UUID && ($uuid ne $SVN_UUID));
 		next if (defined $SVN_URL && ($url ne $SVN_URL));
 
 		print "r$rev = $c\n";
@@ -159,7 +158,7 @@ sub rebuild {
 				croak "SVN repository location required: $url\n";
 			}
 			$SVN_URL ||= $url;
-			$repo_uuid ||= setup_git_svn();
+			$SVN_UUID ||= setup_git_svn();
 			$latest = $rev;
 		}
 		assert_revision_eq_or_unknown($rev, $c);
@@ -252,7 +251,7 @@ sub commit {
 		print "Reading from stdin...\n";
 		@commits = ();
 		while (<STDIN>) {
-			if (/\b($sha1_short)\b/) {
+			if (/\b($sha1_short)\b/o) {
 				unshift @commits, $1;
 			}
 		}
@@ -320,14 +319,14 @@ sub setup_git_svn {
 	mkpath(["$GIT_DIR/$GIT_SVN/info"]);
 	mkpath([$REV_DIR]);
 	s_to_file($SVN_URL,"$GIT_DIR/$GIT_SVN/info/url");
-	my $uuid = svn_info($SVN_URL)->{'Repository UUID'} or
+	$SVN_UUID = svn_info($SVN_URL)->{'Repository UUID'} or
 					croak "Repository UUID unreadable\n";
-	s_to_file($uuid,"$GIT_DIR/$GIT_SVN/info/uuid");
+	s_to_file($SVN_UUID,"$GIT_DIR/$GIT_SVN/info/uuid");
 
 	open my $fd, '>>', "$GIT_DIR/$GIT_SVN/info/exclude" or croak $!;
 	print $fd '.svn',"\n";
 	close $fd or croak $!;
-	return $uuid;
+	return $SVN_UUID;
 }
 
 sub assert_svn_wc_clean {
@@ -850,9 +849,7 @@ sub git_commit {
 	my ($log_msg, @parents) = @_;
 	assert_revision_unknown($log_msg->{revision});
 	my $out_fh = IO::File->new_tmpfile or croak $!;
-	my $info = svn_info('.');
-	my $uuid = $info->{'Repository UUID'};
-	defined $uuid or croak "Unable to get Repository UUID\n";
+	$SVN_UUID ||= svn_info('.')->{'Repository UUID'};
 
 	map_tree_joins() if (@_branch_from && !%tree_map);
 
@@ -891,11 +888,11 @@ sub git_commit {
 		my $msg_fh = IO::File->new_tmpfile or croak $!;
 		print $msg_fh $log_msg->{msg}, "\ngit-svn-id: ",
 					"$SVN_URL\@$log_msg->{revision}",
-					" $uuid\n" or croak $!;
+					" $SVN_UUID\n" or croak $!;
 		$msg_fh->flush == 0 or croak $!;
 		seek $msg_fh, 0, 0 or croak $!;
 
-		set_commit_env($log_msg, $uuid);
+		set_commit_env($log_msg);
 
 		my @exec = ('git-commit-tree',$tree);
 		push @exec, '-p', $_  foreach @exec_parents;
@@ -923,10 +920,10 @@ sub git_commit {
 }
 
 sub set_commit_env {
-	my ($log_msg, $uuid) = @_;
+	my ($log_msg) = @_;
 	my $author = $log_msg->{author};
 	my ($name,$email) = defined $users{$author} ?  @{$users{$author}}
-				: ($author,"$author\@$uuid");
+				: ($author,"$author\@$SVN_UUID");
 	$ENV{GIT_AUTHOR_NAME} = $ENV{GIT_COMMITTER_NAME} = $name;
 	$ENV{GIT_AUTHOR_EMAIL} = $ENV{GIT_COMMITTER_EMAIL} = $email;
 	$ENV{GIT_AUTHOR_DATE} = $ENV{GIT_COMMITTER_DATE} = $log_msg->{date};