$ git clone -n https://src.fedoraproject.org/rpms/erlang-ezlib.git /var/lib/mock/f40-build-1866798-25015/root/chroot_tmpdir/scmroot/erlang-ezlib
Cloning into '/var/lib/mock/f40-build-1866798-25015/root/chroot_tmpdir/scmroot/erlang-ezlib'...
$ git fetch origin 4e3f521d36b1a005b3ea1052f1de77509699ad50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-ezlib
 * [new ref]         4e3f521d36b1a005b3ea1052f1de77509699ad50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e3f521 ezlib ver. 1.0.13