FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/include/zpool_script.shlib

     #
     # Common functions used by the zpool_status and zpool_iostat tests for running
     # scripts with the -c option.
     #
     # Copyright (c) 2017 Lawrence Livermore National Security, LLC.
     #
     
     . $STF_SUITE/include/libtest.shlib
     
    function test_zpool_script {
            script="$1"
            testpool="$2"
            cmd="$3"
            wholecmd="$cmd $script $testpool"
            out="$($wholecmd)"
    
            # Default number of columns that get printed without -c
            if [ "$cmd" != "${cmd/iostat/_/}" ]; then
                    # iostat
                    dcols=7
            else
                    
                    # status
                    dcols=5
            fi
                    
            # Get the new column name that the script created
            col="$(echo "$out" | \
                awk '/^pool +alloc +free +read +write +/ {print $8} \
                /NAME +STATE +READ +WRITE +CKSUM/ {print $6}')"
    
            if [ -z "$col" ] ; then
                    log_fail "'$wholecmd' created no new columns"
            fi
    
            # Count the number of columns for each vdev.  Each script should produce
            # at least one new column value.  Even if scripts return blank, zpool
            # will convert the blank to a '-' to make things awk-able.  Normal
            # zpool iostat -v output is 7 columns, so if the script ran correctly
            # we should see more than that.
            if ! newcols=$(echo "$out" | \
                    awk '/\/dev/ {print NF-'$dcols'; if (NF <= '$dcols') {exit 1}}' | \
                    head -n 1)
      then
                    log_fail "'$wholecmd' didn't create a new column value"
            else
                    log_note "'$wholecmd' passed ($newcols new columns)"
            fi
    }

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