tests: modernise zdb_decompress

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Ahelenia Ziemiańska <[email protected]>
Closes #13348

1 files changed, 7 insertions, 9 deletions

diff --git a/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_decompress.ksh b/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_decompress.ksh
index f10d13fb5..dffed4890 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_decompress.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_decompress.ksh
@@ -81,30 +81,28 @@ log_note "block 0 of $init_data has a DVA of $dva"
 size_str=$(sed -Ene 's/^.+ size=([^ ]+) .*$/\1/p' <<< "$output")
 log_note "block size $size_str"
 
-vdev=$(echo "$dva" | cut -d: -f1)
-offset=$(echo "$dva" | cut -d: -f2)
-output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:d 2> /dev/null)
+IFS=: read -r vdev offset _ <<< "$dva"
+output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:d)
 echo $output | grep -q $pattern || log_fail "zdb -R :d failed to decompress the data properly"
 
-output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:dr 2> /dev/null)
+output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:dr)
 echo $output | grep -q $four_k || log_fail "zdb -R :dr failed to decompress the data properly"
 
-output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:dr 2> /dev/null)
+output=$(zdb -R $TESTPOOL $vdev:$offset:$size_str:dr)
 result=${#output}
 (( $result != $blksize)) && log_fail \
 "zdb -R failed to decompress the data to the length (${#output} != $size_str)"
 
 # decompress using lsize
-lsize=$(echo $size_str | cut -d/ -f1)
-psize=$(echo $size_str | cut -d/ -f2)
-output=$(zdb -R $TESTPOOL $vdev:$offset:$lsize:dr 2> /dev/null)
+IFS=/ read -r lsize psize _ <<< "$size_str"
+output=$(zdb -R $TESTPOOL $vdev:$offset:$lsize:dr)
 result=${#output}
 (( $result != $blksize)) && log_fail \
 "zdb -R failed to decompress the data (length ${#output} != $blksize)"
 
 # Specifying psize will decompress successfully , but not always to full
 # lsize since zdb has to guess lsize incrementally.
-output=$(zdb -R $TESTPOOL $vdev:$offset:$psize:dr 2> /dev/null)
+output=$(zdb -R $TESTPOOL $vdev:$offset:$psize:dr)
 result=${#output}
 # convert psize to decimal
 psize_orig=$psize