$ git clone -n https://src.fedoraproject.org/rpms/erlang-rebar.git /var/lib/mock/f41-build-884545-16596/root/chroot_tmpdir/scmroot/erlang-rebar
Cloning into '/var/lib/mock/f41-build-884545-16596/root/chroot_tmpdir/scmroot/erlang-rebar'...
$ git fetch origin 5aa265000aa43f947b20f48bfdad5fb8740ddb61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-rebar
 * [new ref]         5aa265000aa43f947b20f48bfdad5fb8740ddb61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5aa2650 Eliminate use of obsolete %patchN syntax (#2283636)