update copyrights for 2021

[public-inbox.git] / lib / PublicInbox / IdxStack.pm

diff --git a/lib/PublicInbox/IdxStack.pm b/lib/PublicInbox/IdxStack.pm
index e7e10de94da8cc3a9aa97322e052c9834a944146..d51230061ae504323e5a3e2e2128222c6a0d41d6 100644 (file)
--- a/lib/PublicInbox/IdxStack.pm
+++ b/lib/PublicInbox/IdxStack.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
 # temporary stack for public-inbox-index
@@ -11,6 +11,8 @@ use constant PACK_FMT => eval { pack('Q', 1) } ? 'A1QQH*H*' : 'A1IIH*H*';
 # start off in write-only mode
 sub new {
        open(my $io, '+>', undef) or die "open: $!";
+       # latest_cmt is still useful when the newest revision is a `d'(elete),
+       # otherwise we favor $sync->{latest_cmt} for checkpoints and {quit}
        bless { wr => $io, latest_cmt => $_[1] }, __PACKAGE__
 }