$ git clone -n https://src.fedoraproject.org/rpms/R-lmtest.git /var/lib/mock/f45-build-6203-347/root/chroot_tmpdir/scmroot/R-lmtest
Cloning into '/var/lib/mock/f45-build-6203-347/root/chroot_tmpdir/scmroot/R-lmtest'...
$ git fetch origin 7a68cc9015893e9e21416310559d42c60af93d29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lmtest
 * [new ref]         7a68cc9015893e9e21416310559d42c60af93d29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a68cc9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild