$ git clone -n https://src.fedoraproject.org/rpms/erlang-p1_acme.git /var/lib/mock/f40-build-1866851-25015/root/chroot_tmpdir/scmroot/erlang-p1_acme
Cloning into '/var/lib/mock/f40-build-1866851-25015/root/chroot_tmpdir/scmroot/erlang-p1_acme'...
$ git fetch origin b885894876477dbcf85d2a78ae3a121b11e38bad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-p1_acme
 * [new ref]         b885894876477dbcf85d2a78ae3a121b11e38bad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b885894 p1_acme ver. 1.0.23