$ git clone -n https://src.fedoraproject.org/rpms/detox.git /var/lib/mock/f45-build-7432-363/root/chroot_tmpdir/scmroot/detox
Cloning into '/var/lib/mock/f45-build-7432-363/root/chroot_tmpdir/scmroot/detox'...
$ git fetch origin b5b3d92131e5726c21b63041e8166de75c4e9441:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/detox
 * [new ref]         b5b3d92131e5726c21b63041e8166de75c4e9441 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5b3d92 drop ix86 support