Allow appending to default props for zfs and zpool list.

cmd/zfs/zfs_main.c

@@ -3863,6 +3863,7 @@ zfs_do_list(int argc, char **argv)
 	zfs_sort_column_t *sortcol = NULL;
 	int flags = ZFS_ITER_PROP_LISTSNAPS | ZFS_ITER_ARGS_CAN_BE_PATHS;
 	nvlist_t *data = NULL;
+	char full_fields[1024];
 
 	struct option long_options[] = {
 		{"json", no_argument, NULL, 'j'},
@@ -3875,7 +3876,23 @@ zfs_do_list(int argc, char **argv)
 	    NULL)) != -1) {
 		switch (c) {
 		case 'o':
-			fields = optarg;
+			if (optarg[0] == '+') {
+				/* +2 for the , and the null terminator */
+				if (strlen(fields) + strlen(optarg + 1) + 2 <=
+				    1024) {
+					(void) snprintf(full_fields,
+					    sizeof (full_fields), "%s,%s",
+					    fields, optarg + 1);
+				} else {
+					(void) fprintf(stderr, gettext(
+					    "argument too long for '-o'"
+					    " option.\n"));
+					usage(B_FALSE);
+				}
+				fields = full_fields;
+			} else {
+				fields = optarg;
+			}
 			break;
 		case 'p':
 			cb.cb_literal = B_TRUE;

cmd/zpool/zpool_main.c

@@ -7400,6 +7400,7 @@ zpool_do_list(int argc, char **argv)
 	boolean_t first = B_TRUE;
 	nvlist_t *data = NULL;
 	current_prop_type = ZFS_TYPE_POOL;
+	char full_props[1024];
 
 	struct option long_options[] = {
 		{"json", no_argument, NULL, 'j'},
@@ -7423,7 +7424,23 @@ zpool_do_list(int argc, char **argv)
 			cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
 			break;
 		case 'o':
-			props = optarg;
+			if (optarg[0] == '+') {
+				/* +2 for the , and the null terminator */
+				if (strlen(props) + strlen(optarg + 1) + 2 <=
+				    1024) {
+					(void) snprintf(full_props,
+					    sizeof (full_props), "%s,%s",
+					    props, optarg + 1);
+				} else {
+					(void) fprintf(stderr, gettext(
+					    "argument too long for '-o'"
+					    " option.\n"));
+					usage(B_FALSE);
+				}
+				props = full_props;
+			} else {
+				props = optarg;
+			}
 			break;
 		case 'P':
 			cb.cb_name_flags |= VDEV_NAME_PATH;

man/man8/zfs-list.8

@@ -107,6 +107,13 @@ This is a shortcut for specifying
 .Sy usedds , Ns Sy usedrefreserv , Ns Sy usedchild
 .Fl t Sy filesystem , Ns Sy volume .
 .El
+.Pp
+The default list of properties can be extended by using
+.Sy +property
+instead of
+.Sy property .
+For example,
+.Sy zfs list -o +guid .
 .It Fl p
 Display numbers in parsable
 .Pq exact

man/man8/zpool-list.8

@@ -84,6 +84,13 @@ manual page for a list of valid properties.
 The default list is
 .Sy name , size , allocated , free , checkpoint, expandsize , fragmentation ,
 .Sy capacity , dedupratio , health , altroot .
+.Pp
+The default list of properties can be extended by using
+.Sy +property
+instead of
+.Sy property .
+For example,
+.Sy zpool list -o +guid .
 .It Fl L
 Display real paths for vdevs resolving all symbolic links.
 This can be used to look up the current block device name regardless of the

tests/zfs-tests/tests/functional/cli_user/zfs_list/zfs_list_009_pos.ksh

@@ -0,0 +1,59 @@
+#!/bin/ksh -p
+# SPDX-License-Identifier: CDDL-1.0
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or https://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 	Verify 'zfs list -o+' allows users to append a column to the defaults
+#
+# STRATEGY:
+# 1. Add a user comment to dataset
+# 2. Execute `zfs list -o +comment:`.
+# 3. Verify the first column of the defaults gets printed.
+# 4. Verify the user comment appears as the last column.
+# 5. Verify we see both one of the default entries and the user comment in JSON.
+
+verify_runnable "both"
+
+log_assert "Verify 'zfs list -o+<...>' appends columns to the defaults."
+
+log_must zfs set comment:=helloworld $TESTPOOL
+
+log_must eval zfs list $TESTPOOL -o +comment: | grep -Eq '^NAME.+COMMENT:$'
+log_must eval zfs list $TESTPOOL -o +comment: | grep -Eq "^$TESTPOOL.+helloworld$"
+val=$(zfs list -j -o +comment: $TESTPOOL | jq -r '.datasets.'$TESTPOOL'.properties."comment:".value')
++log_must test $val == "helloworld"
+val=$(zfs list -j -o +comment: $TESTPOOL | jq -r ".datasets.$TESTPOOL.properties.mountpoint.value")
++log_must test $val == "/$TESTPOOL"
+
+log_pass "'zfs list -o+<...>' successfully added columns to the defaults."

tests/zfs-tests/tests/functional/cli_user/zpool_list/zpool_list_003_pos.ksh

@@ -0,0 +1,66 @@
+#!/bin/ksh -p
+# SPDX-License-Identifier: CDDL-1.0
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or https://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2013, 2016 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Verify that 'zpool list -o+' allows users to append a column to the defaults.
+#
+# STRATEGY:
+# 1. Add a user comment to the pool
+# 2. Execute `zfs list -o +comment`.
+# 3. Verify the first column of the defaults gets printed.
+# 4. Verify the user comment appears as the last column.
+# 5. Verify we see both one of the default entries and the user comment in JSON.
+
+verify_runnable "both"
+
+if ! is_global_zone; then
+	TESTPOOL=${TESTPOOL%%/*}
+fi
+
+log_assert "Verify 'zpool list -o+<...>' appends columns to the defaults."
+
+log_must zpool set comment="helloworld" $TESTPOOL
+
+# Verify the first and last columns are correct
+log_must eval zpool list -o +comment | grep -Eq '^NAME.+COMMENT$'
+log_must eval zpool list -o +comment | grep -Eq "^$TESTPOOL.+helloworld$"
+
+# Verify we see both a default value and our added value in the JSON
+val=$(zpool list -j -o +comment | jq -r ".pools.$TESTPOOL.properties.comment.value")
++log_must test "$val" == "helloworld"
+val=$(zpool list -j -o +comment | jq -r ".pools.$TESTPOOL.properties.health.value")
++log_must test "$val" == "ONLINE"
+
+log_pass "'zpool list -o+<...>' successfully added columns to the defaults."