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zfs get -p only outputs 3 columns if "clones" property is empty 

get_clones_string currently returns an empty string for filesystem
snapshots which have no clones. This breaks parsable `zfs get` output as
only three columns are output, instead of 4.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Fiddaman <github@m.fiddaman.uk>
Co-authored-by: matt <matt@fiddaman.net>
Closes #11837
This commit is contained in:
matt-fidd 2021-04-07 00:05:54 +01:00 committed by Tony Hutter
parent 77cba40b85
commit 932d471bec
3 changed files with 21 additions and 4 deletions
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3
lib/libzfs/libzfs_dataset.c
View File

@ -32,6 +32,7 @@
* Copyright 2017-2018 RackTop Systems.
* Copyright (c) 2019 Datto Inc.
* Copyright (c) 2019, loli10K <ezomori.nozomu@gmail.com>
* Copyright (c) 2021 Matt Fiddaman
*/
#include <ctype.h>
@ -2387,7 +2388,7 @@ get_clones_string(zfs_handle_t *zhp, char *propbuf, size_t proplen)
nvpair_t *pair;
value = zfs_get_clones_nvl(zhp);
if (value == NULL)
if (value == NULL || nvlist_empty(value))
return (-1);
propbuf[0] = '\0';

12
tests/zfs-tests/tests/functional/cli_root/zfs_get/zfs_get_001_pos.ksh
View File

@ -27,6 +27,7 @@
#
# Copyright (c) 2016 by Delphix. All rights reserved.
# Copyright (c) 2021 Matt Fiddaman
#
. $STF_SUITE/tests/functional/cli_root/zfs_get/zfs_get_common.kshlib
@ -72,7 +73,8 @@ typeset all_props=("${zfs_props[@]}" \
"${zfs_props_os[@]}" \
"${userquota_props[@]}")
typeset dataset=($TESTPOOL/$TESTCTR $TESTPOOL/$TESTFS $TESTPOOL/$TESTVOL \
$TESTPOOL/$TESTFS@$TESTSNAP $TESTPOOL/$TESTVOL@$TESTSNAP)
$TESTPOOL/$TESTFS@$TESTSNAP $TESTPOOL/$TESTVOL@$TESTSNAP
$TESTPOOL/$TESTFS@$TESTSNAP1 $TESTPOOL/$TESTCLONE)
typeset bookmark_props=(creation)
typeset bookmark=($TESTPOOL/$TESTFS#$TESTBKMARK $TESTPOOL/$TESTVOL#$TESTBKMARK)
@ -102,6 +104,7 @@ function check_return_value
if [[ $item == $p ]]; then
((found += 1))
cols=$(echo $line | awk '{print NF}')
break
fi
done < $TESTDIR/$TESTFILE0
@ -109,6 +112,9 @@ function check_return_value
if ((found == 0)); then
log_fail "'zfs get $opt $props $dst' return " \
"error message.'$p' haven't been found."
elif [[ "$opt" == "-p" ]] && ((cols != 4)); then
log_fail "'zfs get $opt $props $dst' returned " \
"$cols columns instead of 4."
fi
done
@ -123,6 +129,10 @@ log_onexit cleanup
create_snapshot $TESTPOOL/$TESTFS $TESTSNAP
create_snapshot $TESTPOOL/$TESTVOL $TESTSNAP
# Create second snapshot and clone it
create_snapshot $TESTPOOL/$TESTFS $TESTSNAP1
create_clone $TESTPOOL/$TESTFS@$TESTSNAP1 $TESTPOOL/$TESTCLONE
# Create filesystem and volume's bookmark
create_bookmark $TESTPOOL/$TESTFS $TESTSNAP $TESTBKMARK
create_bookmark $TESTPOOL/$TESTVOL $TESTSNAP $TESTBKMARK

10
tests/zfs-tests/tests/functional/cli_root/zfs_get/zfs_get_common.kshlib
View File

@ -26,6 +26,7 @@
#
# Copyright (c) 2016 by Delphix. All rights reserved.
# Copyright (c) 2021 Matt Fiddaman
#
. $STF_SUITE/include/libtest.shlib
@ -87,8 +88,8 @@ function gen_option_str # $elements $prefix $separator $counter
}
#
# Cleanup the volume snapshot, filesystem snapshot, volume bookmark, and
# filesystem bookmark that were created for this test case.
# Cleanup the volume snapshot, filesystem snapshots, clone, volume bookmark,
# and filesystem bookmark that were created for this test case.
#
function cleanup
{
@ -97,6 +98,11 @@ function cleanup
datasetexists $TESTPOOL/$TESTFS@$TESTSNAP && \
destroy_snapshot $TESTPOOL/$TESTFS@$TESTSNAP
datasetexists $TESTPOOL/$TESTCLONE && \
destroy_clone $TESTPOOL/$TESTCLONE
datasetexists $TESTPOOL/$TESTFS@$TESTSNAP1 && \
destroy_snapshot $TESTPOOL/$TESTFS@$TESTSNAP1
bkmarkexists $TESTPOOL/$TESTVOL#$TESTBKMARK && \
destroy_bookmark $TESTPOOL/$TESTVOL#$TESTBKMARK
bkmarkexists $TESTPOOL/$TESTFS#$TESTBKMARK && \