$ git clone -n https://src.fedoraproject.org/rpms/erlang-rebar3-gpb.git /var/lib/mock/f45-build-8419-388/root/chroot_tmpdir/scmroot/erlang-rebar3-gpb
Cloning into '/var/lib/mock/f45-build-8419-388/root/chroot_tmpdir/scmroot/erlang-rebar3-gpb'...
$ git fetch origin 18d5a952cc0f9b2d4f86b9e7d7697f6b4f26b52d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-rebar3-gpb
 * [new ref]         18d5a952cc0f9b2d4f86b9e7d7697f6b4f26b52d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18d5a95 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild