$ git clone -n https://src.fedoraproject.org/rpms/libprelude.git /var/lib/mock/f40-build-2219877-52644/root/chroot_tmpdir/scmroot/libprelude
Cloning into '/var/lib/mock/f40-build-2219877-52644/root/chroot_tmpdir/scmroot/libprelude'...
$ git fetch origin c4132843c77c67b1e68995f433abbc9e187e6b2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libprelude
 * [new ref]         c4132843c77c67b1e68995f433abbc9e187e6b2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c413284 Fix another C compatibility issue (#2148366)