$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-ZMQ.git /var/lib/mock/f45-build-21608-587/root/chroot_tmpdir/scmroot/perl-Alien-ZMQ
Cloning into '/var/lib/mock/f45-build-21608-587/root/chroot_tmpdir/scmroot/perl-Alien-ZMQ'...
$ git fetch origin b49d0e8ed44f2d9550ab99a51592251fffb65f63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-ZMQ
 * [new ref]         b49d0e8ed44f2d9550ab99a51592251fffb65f63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b49d0e8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild