$ git clone -n https://src.fedoraproject.org/rpms/R-crayon.git /var/lib/mock/f45-build-6048-346/root/chroot_tmpdir/scmroot/R-crayon
Cloning into '/var/lib/mock/f45-build-6048-346/root/chroot_tmpdir/scmroot/R-crayon'...
$ git fetch origin 3f4a6d86915fa0693ea9ff11ad4a1784edcc5e38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-crayon
 * [new ref]         3f4a6d86915fa0693ea9ff11ad4a1784edcc5e38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f4a6d8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild