$ git clone -n https://src.fedoraproject.org/rpms/gnome-contacts.git /var/lib/mock/f39-build-1691158-41136/root/chroot_tmpdir/scmroot/gnome-contacts
Cloning into '/var/lib/mock/f39-build-1691158-41136/root/chroot_tmpdir/scmroot/gnome-contacts'...
$ git fetch origin d5dd41741f9c230ac7765211e053dff19f1feb2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-contacts
 * [new ref]         d5dd41741f9c230ac7765211e053dff19f1feb2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5dd417 Update to 45.0