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#!perl -w
# Copyright (C) 2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
eval { require PublicInbox::Gcf2 };
die "libgit2 development package or Inline::C missing for $0: $@\n" if $@;
my @dirs; # may get big (30K-100K)
my $gcf2 = PublicInbox::Gcf2::new();
use IO::Handle; # autoflush
STDERR->autoflush(1);
STDOUT->autoflush(1);

while (<STDIN>) {
	chomp;
	if (m!\A/!) { # +/path/to/git-dir
		push @dirs, $_;
		$gcf2->add_alternate("$_/objects");
	} elsif (!$gcf2->cat_oid(1, $_)) {
		# retry once if missing.  We only get unabbreviated OIDs
		# from SQLite or Xapian DBs, here, so malicious clients
		# can't trigger excessive retries:
		my $oid = $_;
		warn "I: $$ $oid missing, retrying...\n";

		# clients may need to wait a bit for this:
		$gcf2 = PublicInbox::Gcf2::new();
		$gcf2->add_alternate("$_/objects") for @dirs;

		if ($gcf2->cat_oid(1, $oid)) {
			warn "I: $$ $oid found after retry\n";
		} else {
			warn "W: $$ $oid missing after retry\n";
			print "$oid missing\n"; # mimic git-cat-file
		}
	}
}