$ git clone -n https://src.fedoraproject.org/rpms/erlang-p1_mysql.git /var/lib/mock/f40-build-1937345-25150/root/chroot_tmpdir/scmroot/erlang-p1_mysql
Cloning into '/var/lib/mock/f40-build-1937345-25150/root/chroot_tmpdir/scmroot/erlang-p1_mysql'...
$ git fetch origin 4878e48197154fbc5f5f2c771a16e23a86c1d816:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-p1_mysql
 * [new ref]         4878e48197154fbc5f5f2c771a16e23a86c1d816 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4878e48 p1_mysql ver. 1.0.24