$ git clone -n https://src.fedoraproject.org/rpms/erlang-cl.git /var/lib/mock/f41-build-side-1-2811235-32927/root/chroot_tmpdir/scmroot/erlang-cl
Cloning into '/var/lib/mock/f41-build-side-1-2811235-32927/root/chroot_tmpdir/scmroot/erlang-cl'...
$ git fetch origin 0f5ae34882d21c4c2491daba757df51185adf803:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-cl
 * [new ref]         0f5ae34882d21c4c2491daba757df51185adf803 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f5ae34 Cosmetic changes