$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Int64.git /var/lib/mock/f45-build-24688-605/root/chroot_tmpdir/scmroot/perl-Math-Int64
Cloning into '/var/lib/mock/f45-build-24688-605/root/chroot_tmpdir/scmroot/perl-Math-Int64'...
$ git fetch origin 40eeb99991b180a0904cda56c22f6c1b4cd7337c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Int64
 * [new ref]         40eeb99991b180a0904cda56c22f6c1b4cd7337c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40eeb99 Perl 5.44 rebuild