$ git clone -n https://src.fedoraproject.org/rpms/libre.git /var/lib/mock/f41-build-side-1-3140311-39959/root/chroot_tmpdir/scmroot/libre
Cloning into '/var/lib/mock/f41-build-side-1-3140311-39959/root/chroot_tmpdir/scmroot/libre'...
$ git fetch origin f030ef34f2a65a31560319dd127daeba4b5e7069:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libre
 * [new ref]         f030ef34f2a65a31560319dd127daeba4b5e7069 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f030ef3 Upgrade to 3.18.0 (#2331646)