Syntax error in wsrep_sst_common: [: readable: integer expression expected

2022-02-02 18:06:40 0 [Note] WSREP: Running: 'wsrep_sst_rsync --role 'joiner' --address '127.0.0.2:16007' --datadir '/mnt8t/bld/10.6-debug-nightly/mysql-test/var/mysqld.2/data/

' --defaults-file '/dev/shm/var_auto_lv8A/my.cnf' --defaults-group-suffix '.2' --parent '711467' --binlog 'mysqld-bin' --binlog-index 'mysqld-bin.index' --mysqld-args --default

s-group-suffix=.2 --defaults-file=/mnt8t/bld/10.6-debug-nightly/mysql-test/var/my.cnf --log-output=file --innodb --innodb-cmpmem --innodb-cmp-per-index --innodb-trx --innodb-lo

cks --innodb-lock-waits --innodb-metrics --innodb-buffer-pool-stats --innodb-buffer-page --innodb-buffer-page-lru --innodb-sys-columns --innodb-sys-fields --innodb-sys-foreign 

--innodb-sys-foreign-cols --innodb-sys-indexes --innodb-sys-tables --innodb-sys-virtual --log-bin=master-bin --log-bin --wsrep_forced_binlog_format=ROW --core-file --loose-debu

g-sync-timeout=300'

/mnt8t/bld/10.6-debug-nightly//bin/wsrep_sst_common: line 1127: [: readable: integer expression expected

    local readable=1; [ ! -r "$cert" ] && readable=0

    [ -n "$ca"  ] &&  [ ! -r "$ca"   ] && readable=0

    [ -n "$cap" ] &&  [ ! -r "$cap"  ] && readable=0

    if [ readable -eq 0 ]; then

        wsrep_log_error \

            "Both PEM file and CA file (or path) must be readable"

        exit 22

    fi