$ git clone -n https://src.fedoraproject.org/rpms/libarrow.git /var/lib/mock/f40-build-1239497-22917/root/chroot_tmpdir/scmroot/libarrow
Cloning into '/var/lib/mock/f40-build-1239497-22917/root/chroot_tmpdir/scmroot/libarrow'...
$ git fetch origin c6565bbcee3baaaa174fe49a406fa405bbf9d965:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libarrow
 * [new ref]         c6565bbcee3baaaa174fe49a406fa405bbf9d965 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6565bb Remove extraneous openssl dependencies