1 files changed, 8 insertions, 0 deletions
diff --git a/script/public-inbox-cindex b/script/public-inbox-cindex
index e2500b93..f8a3ebbb 100755
--- a/script/public-inbox-cindex
+++ b/script/public-inbox-cindex
@@ -53,6 +53,11 @@ if (defined(my $pl = $opt->{'project-list'})) {
          my $pfx = shift @ARGV // die <<EOM;
  PROJECTS_ROOT required for --project-list
  EOM
+        @ARGV and die <<EOM;
+--project-list does not accept additional directories
+(@ARGV)
+beyond `$pfx'
+EOM
          open my $fh, '<', $pl or die "open($pl): $!\n";
          chomp(@git_dirs = <$fh>);
          $_ = PublicInbox::Admin::resolve_git_dir("$pfx/$_") for @git_dirs;
@@ -67,6 +72,9 @@ if (defined $cidx_dir) { # external index
  } elsif (!@git_dirs) {
          die $help
  } else {
+        die <<EOM if $opt->{update};
+--update requires `-d EXTDIR'
+EOM
          for my $gd (@git_dirs) {
                  my $cd = "$gd/public-inbox-cindex";
                  my $cidx = PublicInbox::CodeSearchIdx->new($cd, { %$opt });