POSIX shell support in 10.0-galera would require f16ead5 however this shellcheck component wasn't included.
shellcheck -s sh wsrep_sst_common.sh
In wsrep_sst_common.sh line 258:
[ -n $3 ] && reval=$3
^-- SC2070: -n doesn't work with unquoted arguments. Quote or use [[ ]].
^-- SC2086: Double quote to prevent globbing and word splitting.