$ git clone -n https://src.fedoraproject.org/rpms/libre.git /var/lib/mock/f45-build-16845-491/root/chroot_tmpdir/scmroot/libre
Cloning into '/var/lib/mock/f45-build-16845-491/root/chroot_tmpdir/scmroot/libre'...
$ git fetch origin 3b5284b7bdc8e1fcef0be3810ce76d09b3e98c08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libre
 * [new ref]         3b5284b7bdc8e1fcef0be3810ce76d09b3e98c08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b5284b Upgrade to 4.11.0 (#2523339)