$ git clone -n https://src.fedoraproject.org/rpms/fedora-third-party.git /var/lib/mock/f45-build-8872-396/root/chroot_tmpdir/scmroot/fedora-third-party
Cloning into '/var/lib/mock/f45-build-8872-396/root/chroot_tmpdir/scmroot/fedora-third-party'...
$ git fetch origin f7553acc4c800bd3ecbfec06e17f3586eccde4c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-third-party
 * [new ref]         f7553acc4c800bd3ecbfec06e17f3586eccde4c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7553ac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild