$ git clone -n https://src.fedoraproject.org/rpms/R-rcmdcheck.git /var/lib/mock/f42-build-3406846-45143/root/chroot_tmpdir/scmroot/R-rcmdcheck
Cloning into '/var/lib/mock/f42-build-3406846-45143/root/chroot_tmpdir/scmroot/R-rcmdcheck'...
$ git fetch origin 0920f7e6a0fbad024cf8950255bd9113cf7da87d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rcmdcheck
 * [new ref]         0920f7e6a0fbad024cf8950255bd9113cf7da87d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0920f7e Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild