$ git clone -n https://src.fedoraproject.org/rpms/colord-gtk.git /var/lib/mock/f45-build-6840-352/root/chroot_tmpdir/scmroot/colord-gtk
Cloning into '/var/lib/mock/f45-build-6840-352/root/chroot_tmpdir/scmroot/colord-gtk'...
$ git fetch origin ff67e467050e9399a1e927ffbc0d4082cb36d9cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/colord-gtk
 * [new ref]         ff67e467050e9399a1e927ffbc0d4082cb36d9cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff67e46 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild