$ git clone -n https://src.fedoraproject.org/rpms/erlang-cowlib.git /var/lib/mock/f45-build-8254-382/root/chroot_tmpdir/scmroot/erlang-cowlib
Cloning into '/var/lib/mock/f45-build-8254-382/root/chroot_tmpdir/scmroot/erlang-cowlib'...
$ git fetch origin 318f8491a1afd170e1114c5d37f07f953c0a8e4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-cowlib
 * [new ref]         318f8491a1afd170e1114c5d37f07f953c0a8e4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 318f849 Cowlib ver. 2.19.0