tar-tree deprecation: we eat our own dog food.

It is silly to keep using git-tar-tree in dist target when the
command gives a big deprecation warning when called.  Instead,
use "git-archive --format=tar" which we recommend to our users.

Update gitweb's snapshot feature to use git-archive for the same
reason.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -856,8 +856,9 @@ git.spec: git.spec.in
 	mv $@+ $@
 
 GIT_TARNAME=git-$(GIT_VERSION)
-dist: git.spec git-tar-tree
-	./git-tar-tree HEAD^{tree} $(GIT_TARNAME) > $(GIT_TARNAME).tar
+dist: git.spec git-archive
+	./git-archive --format=tar \
+		--prefix=$(GIT_TARNAME)/ HEAD^{tree} > $(GIT_TARNAME).tar
 	@mkdir -p $(GIT_TARNAME)
 	@cp git.spec $(GIT_TARNAME)
 	@echo $(GIT_VERSION) > $(GIT_TARNAME)/version

gitweb/gitweb.perl

@@ -2838,9 +2838,12 @@ sub git_snapshot {
 		-content_disposition => 'inline; filename="' . "$filename" . '"',
 		-status => '200 OK');
 
-	my $git_command = git_cmd_str();
-	open my $fd, "-|", "$git_command tar-tree $hash \'$project\' | $command" or
-		die_error(undef, "Execute git-tar-tree failed.");
+	my $git = git_cmd_str();
+	my $name = $project;
+	$name =~ s/\047/\047\\\047\047/g;
+	open my $fd, "-|",
+	"$git archive --format=tar --prefix=\'$name\'/ $hash | $command"
+		or die_error(undef, "Execute git-tar-tree failed.");
 	binmode STDOUT, ':raw';
 	print <$fd>;
 	binmode STDOUT, ':utf8'; # as set at the beginning of gitweb.cgi