$ git clone -n https://src.fedoraproject.org/rpms/R-rcmdcheck.git /var/lib/mock/f45-build-6361-348/root/chroot_tmpdir/scmroot/R-rcmdcheck
Cloning into '/var/lib/mock/f45-build-6361-348/root/chroot_tmpdir/scmroot/R-rcmdcheck'...
$ git fetch origin 0d94404480ab0cdf6f9f7339015660e2285f2479:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rcmdcheck
 * [new ref]         0d94404480ab0cdf6f9f7339015660e2285f2479 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d94404 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild