$ git clone -n https://src.fedoraproject.org/rpms/perl-B-Hooks-OP-PPAddr.git /var/lib/mock/f45-build-21843-588/root/chroot_tmpdir/scmroot/perl-B-Hooks-OP-PPAddr
Cloning into '/var/lib/mock/f45-build-21843-588/root/chroot_tmpdir/scmroot/perl-B-Hooks-OP-PPAddr'...
$ git fetch origin d6a70554dacebe9cc29bf0ace7f164abd47d2931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-B-Hooks-OP-PPAddr
 * [new ref]         d6a70554dacebe9cc29bf0ace7f164abd47d2931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6a7055 Perl 5.44 rebuild