$ git clone -n https://src.fedoraproject.org/rpms/recap.git /var/lib/mock/f45-build-34398-686/root/chroot_tmpdir/scmroot/recap
Cloning into '/var/lib/mock/f45-build-34398-686/root/chroot_tmpdir/scmroot/recap'...
$ git fetch origin 87e3c967fcf2961178a8dbdd3e21eb70f92bca11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/recap
 * [new ref]         87e3c967fcf2961178a8dbdd3e21eb70f92bca11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87e3c96 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild