[PATCH 2/2] config: ignore extindex entries with newlines in paths

[Eric Wong <e@80x24.org>]

git 2.11 and earlier could not handle git directories with
newlines in them, nor does libgit2 support them.

Followup-to: d87dd0e679587043 ("config: reject `\n' in `inboxdir'")
---
 lib/PublicInbox/Config.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index 1037c884..770d9256 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -514,6 +514,10 @@ sub _fill_ei ($$) {
 	my $pfx = "extindex.$name";
 	my $d = $self->{"$pfx.topdir"} // return;
 	-d $d or return;
+	if (index($d, "\n") >= 0) {
+		warn "E: `$d' must not contain `\\n'\n";
+		return;
+	}
 	my $es = PublicInbox::ExtSearch->new($d);
 	for my $k (qw(indexlevel indexsequentialshard)) {
 		my $v = _one_val($self, $pfx, $k) // next;