$ git clone -n https://src.fedoraproject.org/rpms/R-lintr.git /var/lib/mock/f43-build-58895797-6569073/root/chroot_tmpdir/scmroot/R-lintr
Cloning into '/var/lib/mock/f43-build-58895797-6569073/root/chroot_tmpdir/scmroot/R-lintr'...
$ git fetch origin 57219f9dcf9ac18d3fa32e1ad20cda19c2944dc2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lintr
 * [new ref]         57219f9dcf9ac18d3fa32e1ad20cda19c2944dc2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57219f9 R-maint-sig mass rebuild