nntpd+imapd: detect replaced over.sqlite3

For v1 inboxes (and possibly v2 in the future, for VACUUM),
public-inbox-compact replaces over.sqlite3 with a new file.

This currently doesn't need an extra inotify watch descriptor
(or FD for kevent) at the moment, so it can coexist nicely for
systems w/o IO::KQueue or Linux::Inotify2.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index ac13c7df..bffd773c 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -334,7 +334,9 @@ sub cmd_newnews ($$$$;$$) {
 sub cmd_group ($$) {
         my ($self, $group) = @_;
         my $no_such = '411 no such news group';
-        my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
+        my $nntpd = $self->{nntpd};
+        my $ng = $nntpd->{groups}->{$group} or return $no_such;
+        $nntpd->idler_start;
 
         $self->{ng} = $ng;
         my ($min, $max) = $ng->mm->minmax;