$ git clone -n https://src.fedoraproject.org/rpms/why3.git /var/lib/mock/f39-build-2453174-61041/root/chroot_tmpdir/scmroot/why3
Cloning into '/var/lib/mock/f39-build-2453174-61041/root/chroot_tmpdir/scmroot/why3'...
$ git fetch origin b04eb93322a82251b8fa3ca083964ebd8e3c49aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/why3
 * [new ref]         b04eb93322a82251b8fa3ca083964ebd8e3c49aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b04eb93 Version 1.7.1