$ git clone -n https://src.fedoraproject.org/rpms/zeromq.git /var/lib/mock/f40-build-2225491-52830/root/chroot_tmpdir/scmroot/zeromq
Cloning into '/var/lib/mock/f40-build-2225491-52830/root/chroot_tmpdir/scmroot/zeromq'...
$ git fetch origin d1f897dccf492ea2955e426826903e4b91d8c71b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zeromq
 * [new ref]         d1f897dccf492ea2955e426826903e4b91d8c71b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1f897d Build with _DEFAULT_SOURCE to avoid compatibility issue