$ git clone -n https://src.fedoraproject.org/rpms/R-qtl.git /var/lib/mock/f38-build-side-42-init-devel-612741-26287/root/chroot_tmpdir/scmroot/R-qtl
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-612741-26287/root/chroot_tmpdir/scmroot/R-qtl'...
$ git fetch origin cb9e3eb0dd4333ddb2f1e4a0936e8251e0f48ff9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-qtl
 * [new ref]         cb9e3eb0dd4333ddb2f1e4a0936e8251e0f48ff9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb9e3eb Update to 1.58