$ git clone -n https://src.fedoraproject.org/rpms/R-lintr.git /var/lib/mock/f40-build-2224000-52761/root/chroot_tmpdir/scmroot/R-lintr
Cloning into '/var/lib/mock/f40-build-2224000-52761/root/chroot_tmpdir/scmroot/R-lintr'...
$ git fetch origin ae4560651086fd7f2990e590daecb5cceef81c60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lintr
 * [new ref]         ae4560651086fd7f2990e590daecb5cceef81c60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae45606 3.1.1