index: require --reindex when using --xapian-only

This to avoid user error of a currently undocumented switch;
since --xapian-only always goes through the full history at
the moment.

1 files changed, 3 insertions, 0 deletions

diff --git a/script/public-inbox-index b/script/public-inbox-index
index 73ca2953..9e0907be 100755
--- a/script/public-inbox-index
+++ b/script/public-inbox-index
@@ -42,6 +42,9 @@ GetOptions($opt, qw(verbose|v+ reindex rethread compact|c+ jobs|j=i prune
         or die "bad command-line args\n$usage";
 if ($opt->{help}) { print $help; exit 0 };
 die "--jobs must be >= 0\n" if defined $opt->{jobs} && $opt->{jobs} < 0;
+if ($opt->{xapianonly} && !$opt->{reindex}) {
+        die "--xapian-only requires --reindex\n";
+}
 
 # require lazily to speed up --help
 require PublicInbox::Admin;