$ git clone -n https://src.fedoraproject.org/rpms/erlang-rebar3-pc.git /var/lib/mock/f40-build-1817398-24911/root/chroot_tmpdir/scmroot/erlang-rebar3-pc
Cloning into '/var/lib/mock/f40-build-1817398-24911/root/chroot_tmpdir/scmroot/erlang-rebar3-pc'...
$ git fetch origin b72c05e3699fd5f3429213e2e47977cb467f4851:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-rebar3-pc
 * [new ref]         b72c05e3699fd5f3429213e2e47977cb467f4851 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b72c05e Add requires