$ git clone -n https://src.fedoraproject.org/rpms/libarrow.git /var/lib/mock/f40-build-803192-144204/root/chroot_tmpdir/scmroot/libarrow
Cloning into '/var/lib/mock/f40-build-803192-144204/root/chroot_tmpdir/scmroot/libarrow'...
$ git fetch origin 9df03a2320290eec135f2a242dbb69035ece40de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libarrow
 * [new ref]         9df03a2320290eec135f2a242dbb69035ece40de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9df03a2 rebuild with liborc-1.9.3