$ git clone -n https://src.fedoraproject.org/rpms/arianna.git /var/lib/mock/f40-build-2379868-60448/root/chroot_tmpdir/scmroot/arianna
Cloning into '/var/lib/mock/f40-build-2379868-60448/root/chroot_tmpdir/scmroot/arianna'...
$ git fetch origin e52697a329b48cf2af135a34ea6b1aa21e60bbf4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arianna
 * [new ref]         e52697a329b48cf2af135a34ea6b1aa21e60bbf4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e52697a 24.01.95