$ git clone -n https://src.fedoraproject.org/rpms/rabbitmq-server.git /var/lib/mock/f38-build-side-42-init-devel-893610-28545/root/chroot_tmpdir/scmroot/rabbitmq-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-893610-28545/root/chroot_tmpdir/scmroot/rabbitmq-server'...
$ git fetch origin 48f822cc5c045f0f280c7579654676c9b943a02f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rabbitmq-server
 * [new ref]         48f822cc5c045f0f280c7579654676c9b943a02f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48f822c RabbitMQ ver. 3.11.11