$ git clone -n https://src.fedoraproject.org/rpms/R-ape.git /var/lib/mock/f45-build-5971-345/root/chroot_tmpdir/scmroot/R-ape
Cloning into '/var/lib/mock/f45-build-5971-345/root/chroot_tmpdir/scmroot/R-ape'...
$ git fetch origin cb6a9f7e91a23ac64929a07a1108cbb95a9e38a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-ape
 * [new ref]         cb6a9f7e91a23ac64929a07a1108cbb95a9e38a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb6a9f7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild