$ git clone -n https://src.fedoraproject.org/rpms/erlang-yconf.git /var/lib/mock/f40-build-1507202-23890/root/chroot_tmpdir/scmroot/erlang-yconf
Cloning into '/var/lib/mock/f40-build-1507202-23890/root/chroot_tmpdir/scmroot/erlang-yconf'...
$ git fetch origin 430defe74b5e9e7b99460f524417579af58bc633:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-yconf
 * [new ref]         430defe74b5e9e7b99460f524417579af58bc633 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 430defe yconf ver. 1.0.16