$ git clone -n https://src.fedoraproject.org/rpms/R-RcppTOML.git /var/lib/mock/f45-build-5915-345/root/chroot_tmpdir/scmroot/R-RcppTOML
Cloning into '/var/lib/mock/f45-build-5915-345/root/chroot_tmpdir/scmroot/R-RcppTOML'...
$ git fetch origin 71d29b4b9a86721166af1d7e7f21f89a614a0c49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RcppTOML
 * [new ref]         71d29b4b9a86721166af1d7e7f21f89a614a0c49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71d29b4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild