$ git clone -n https://src.fedoraproject.org/rpms/R-mime.git /var/lib/mock/f45-build-6232-347/root/chroot_tmpdir/scmroot/R-mime
Cloning into '/var/lib/mock/f45-build-6232-347/root/chroot_tmpdir/scmroot/R-mime'...
$ git fetch origin c433d4113ec3c6a48d7faec52b18f42285403230:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-mime
 * [new ref]         c433d4113ec3c6a48d7faec52b18f42285403230 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c433d41 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild