$ git clone -n https://src.fedoraproject.org/rpms/fedora-logos.git /var/lib/mock/f45-build-8866-396/root/chroot_tmpdir/scmroot/fedora-logos
Cloning into '/var/lib/mock/f45-build-8866-396/root/chroot_tmpdir/scmroot/fedora-logos'...
$ git fetch origin 861bd4abf5767da1a178d081dda9720ad1d67e88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedora-logos
 * [new ref]         861bd4abf5767da1a178d081dda9720ad1d67e88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 861bd4a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild