$ git clone -n https://src.fedoraproject.org/rpms/american-fuzzy-lop.git /var/lib/mock/f41-build-849429-164777/root/chroot_tmpdir/scmroot/american-fuzzy-lop
Cloning into '/var/lib/mock/f41-build-849429-164777/root/chroot_tmpdir/scmroot/american-fuzzy-lop'...
$ git fetch origin b77a09af2051ae42e1800b12c712c533dc3d86aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/american-fuzzy-lop
 * [new ref]         b77a09af2051ae42e1800b12c712c533dc3d86aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b77a09a Bump release and rebuild