$ git clone -n https://src.fedoraproject.org/rpms/kf6-kcrash.git /var/lib/mock/f40-build-787718-134881/root/chroot_tmpdir/scmroot/kf6-kcrash
Cloning into '/var/lib/mock/f40-build-787718-134881/root/chroot_tmpdir/scmroot/kf6-kcrash'...
$ git fetch origin 8a84a4811ef49698a4f5bae4ff4ce410638dc2d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kcrash
 * [new ref]         8a84a4811ef49698a4f5bae4ff4ce410638dc2d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a84a48 6.0.0