$ git clone -n https://src.fedoraproject.org/rpms/python-productmd.git /var/lib/mock/f45-build-32148-657/root/chroot_tmpdir/scmroot/python-productmd
Cloning into '/var/lib/mock/f45-build-32148-657/root/chroot_tmpdir/scmroot/python-productmd'...
$ git fetch origin c77e7c7346e6a101635f4b3934d7954561f2f598:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-productmd
 * [new ref]         c77e7c7346e6a101635f4b3934d7954561f2f598 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c77e7c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild