$ git clone -n https://src.fedoraproject.org/rpms/libre.git /var/lib/mock/f40-build-2727189-73126/root/chroot_tmpdir/scmroot/libre
Cloning into '/var/lib/mock/f40-build-2727189-73126/root/chroot_tmpdir/scmroot/libre'...
$ git fetch origin 554c8cbeeedb022e883ea17a2a0ba0fa64a4ed50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libre
 * [new ref]         554c8cbeeedb022e883ea17a2a0ba0fa64a4ed50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 554c8cb Upgrade to 3.11.0 (#2274320)