$ git clone -n https://src.fedoraproject.org/rpms/R-lintr.git /var/lib/mock/f45-build-6210-347/root/chroot_tmpdir/scmroot/R-lintr
Cloning into '/var/lib/mock/f45-build-6210-347/root/chroot_tmpdir/scmroot/R-lintr'...
$ git fetch origin 473e18d4480a9c77e723d333f0a9a3d7accb2497:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lintr
 * [new ref]         473e18d4480a9c77e723d333f0a9a3d7accb2497 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 473e18d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild