$ git clone -n https://src.fedoraproject.org/rpms/erlang.git /var/lib/mock/f45-build-8274-383/root/chroot_tmpdir/scmroot/erlang
Cloning into '/var/lib/mock/f45-build-8274-383/root/chroot_tmpdir/scmroot/erlang'...
$ git fetch origin 015c265fe49d8eb058e950e7ef208190a9d1a121:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang
 * [new ref]         015c265fe49d8eb058e950e7ef208190a9d1a121 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 015c265 Erlang ver. 27.3.4.18