Add 'zfs diff' coverage to the ZFS Test Suite

This change adds four new tests to the ZTS:

 * zfs_diff_changes: verify type of changes diplayed (-, +, R and M)
 * zfs_diff_cliargs: verify command line options and arguments
 * zfs_diff_timestamp: verify 'zfs diff -t'
 * zfs_diff_types: verify type of objects (files, dirs, pipes...)

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: John Wren Kennedy <[email protected]>
Signed-off-by: loli10K <[email protected]>
Closes #6686 

12 files changed, 518 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 37babef54..8d1a8c9f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -188,6 +188,7 @@ AC_CONFIG_FILES([
 	tests/zfs-tests/tests/functional/cli_root/zfs_copies/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zfs_create/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zfs_destroy/Makefile
+	tests/zfs-tests/tests/functional/cli_root/zfs_diff/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zfs_get/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zfs_inherit/Makefile
 	tests/zfs-tests/tests/functional/cli_root/zfs_load-key/Makefile
diff --git a/tests/runfiles/linux.run b/tests/runfiles/linux.run
index a83d1d68d..b4853586a 100644
--- a/tests/runfiles/linux.run
+++ b/tests/runfiles/linux.run
@@ -104,6 +104,10 @@ tests = ['zfs_destroy_001_pos', 'zfs_destroy_002_pos', 'zfs_destroy_003_pos',
     'zfs_destroy_013_neg', 'zfs_destroy_014_pos', 'zfs_destroy_015_pos',
     'zfs_destroy_016_pos']
 
+[tests/functional/cli_root/zfs_diff]
+tests = ['zfs_diff_changes', 'zfs_diff_cliargs', 'zfs_diff_timestamp',
+    'zfs_diff_types']
+
 [tests/functional/cli_root/zfs_get]
 tests = ['zfs_get_001_pos', 'zfs_get_002_pos', 'zfs_get_003_pos',
     'zfs_get_004_pos', 'zfs_get_005_neg', 'zfs_get_006_neg', 'zfs_get_007_neg',
diff --git a/tests/zfs-tests/tests/functional/cli_root/Makefile.am b/tests/zfs-tests/tests/functional/cli_root/Makefile.am
index c6c394e2b..acea36bb7 100644
--- a/tests/zfs-tests/tests/functional/cli_root/Makefile.am
+++ b/tests/zfs-tests/tests/functional/cli_root/Makefile.am
@@ -11,6 +11,7 @@ SUBDIRS = \
 	zfs_copies \
 	zfs_create \
 	zfs_destroy \
+	zfs_diff \
 	zfs_get \
 	zfs_inherit \
 	zfs_load-key \
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/.gitignore b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/.gitignore
new file mode 100644
index 000000000..7fa74c357
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/.gitignore
@@ -0,0 +1 @@
+/socket
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/Makefile.am b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/Makefile.am
new file mode 100644
index 000000000..afb45371a
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/Makefile.am
@@ -0,0 +1,16 @@
+include $(top_srcdir)/config/Rules.am
+
+pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/cli_root/zfs_diff
+
+dist_pkgdata_SCRIPTS = \
+	cleanup.ksh \
+	setup.ksh \
+	zfs_diff_changes.ksh \
+	zfs_diff_cliargs.ksh \
+	zfs_diff_timestamp.ksh \
+	zfs_diff_types.ksh
+
+pkgexecdir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/cli_root/zfs_diff
+
+pkgexec_PROGRAMS = socket
+socket_SOURCES = socket.c
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/cleanup.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/cleanup.ksh
new file mode 100755
index 000000000..1adac153d
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/cleanup.ksh
@@ -0,0 +1,19 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+default_cleanup
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/setup.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/setup.ksh
new file mode 100755
index 000000000..e37841add
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/setup.ksh
@@ -0,0 +1,21 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+DISK=${DISKS%% *}
+
+default_volume_setup $DISK
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/socket.c b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/socket.c
new file mode 100644
index 000000000..75e6e1ecf
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/socket.c
@@ -0,0 +1,54 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2017, loli10K <[email protected]>. All rights reserved.
+ */
+
+#include <fcntl.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* ARGSUSED */
+int
+main(int argc, char *argv[])
+{
+	struct sockaddr_un sock;
+	int fd;
+	char *path;
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s /path/to/socket\n", argv[0]);
+		exit(1);
+	}
+	path = argv[1];
+	strncpy(sock.sun_path, (char *)path, sizeof (sock.sun_path));
+	sock.sun_family = AF_UNIX;
+	if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) == -1) {
+		perror("socket");
+		return (1);
+	}
+	if (bind(fd, (struct sockaddr *)&sock, sizeof (struct sockaddr_un))) {
+		perror("bind");
+		return (1);
+	}
+	if (close(fd)) {
+		perror("close");
+		return (1);
+	}
+	return (0);
+}
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_changes.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_changes.ksh
new file mode 100755
index 000000000..51a1b4aa1
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_changes.ksh
@@ -0,0 +1,96 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 'zfs diff' should display changes correctly.
+#
+# STRATEGY:
+# 1. Create a filesystem with both files and directories, then snapshot it
+# 2. Generate different types of changes and verify 'zfs diff' displays them
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	log_must zfs destroy -r "$DATASET"
+	rm -f "$FILEDIFF"
+}
+
+#
+# Verify object $path has $change type
+# Valid types are:
+# * - (The path has been removed)
+# * + (The path has been created)
+# * M (The path has been modified)
+# * R (The path has been renamed)
+#
+function verify_object_change # <path> <change>
+{
+	path="$1"
+	change="$2"
+
+	log_must eval "zfs diff -F $TESTSNAP1 $TESTSNAP2 > $FILEDIFF"
+	diffchg="$(awk -v path="$path" '$NF == path { print $1 }' < $FILEDIFF)"
+	if [[ "$diffchg" != "$change" ]]; then
+		log_fail "Unexpected change for $path ('$diffchg' != '$change')"
+	else
+		log_note "Object $path change is displayed correctly: '$change'"
+	fi
+}
+
+log_assert "'zfs diff' should display changes correctly."
+log_onexit cleanup
+
+DATASET="$TESTPOOL/$TESTFS/fs"
+TESTSNAP1="$DATASET@snap1"
+TESTSNAP2="$DATASET@snap2"
+FILEDIFF="$TESTDIR/zfs-diff.txt"
+
+# 1. Create a filesystem with both files and directories, then snapshot it
+log_must zfs create $DATASET
+MNTPOINT="$(get_prop mountpoint $DATASET)"
+log_must touch "$MNTPOINT/fremoved"
+log_must touch "$MNTPOINT/frenamed"
+log_must touch "$MNTPOINT/fmodified"
+log_must mkdir "$MNTPOINT/dremoved"
+log_must mkdir "$MNTPOINT/drenamed"
+log_must mkdir "$MNTPOINT/dmodified"
+log_must zfs snapshot "$TESTSNAP1"
+
+# 2. Generate different types of changes and verify 'zfs diff' displays them
+log_must rm -f "$MNTPOINT/fremoved"
+log_must mv "$MNTPOINT/frenamed" "$MNTPOINT/frenamed.new"
+log_must touch "$MNTPOINT/fmodified"
+log_must rmdir "$MNTPOINT/dremoved"
+log_must mv "$MNTPOINT/drenamed" "$MNTPOINT/drenamed.new"
+log_must touch "$MNTPOINT/dmodified/file"
+log_must touch "$MNTPOINT/fcreated"
+log_must mkdir "$MNTPOINT/dcreated"
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_change "$MNTPOINT/fremoved" "-"
+verify_object_change "$MNTPOINT/frenamed.new" "R"
+verify_object_change "$MNTPOINT/fmodified" "M"
+verify_object_change "$MNTPOINT/fcreated" "+"
+verify_object_change "$MNTPOINT/dremoved" "-"
+verify_object_change "$MNTPOINT/drenamed.new" "R"
+verify_object_change "$MNTPOINT/dmodified" "M"
+verify_object_change "$MNTPOINT/dcreated" "+"
+
+log_pass "'zfs diff' displays changes correctly."
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_cliargs.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_cliargs.ksh
new file mode 100755
index 000000000..c4b42afee
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_cliargs.ksh
@@ -0,0 +1,80 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 'zfs diff' should only work with supported options.
+#
+# STRATEGY:
+# 1. Create two snapshots
+# 2. Verify every supported option is accepted
+# 3. Verify supported options raise an error with unsupported arguments
+# 4. Verify other unsupported options raise an error
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	for snap in $TESTSNAP1 $TESTSNAP2; do
+		if snapexists "$snap"; then
+			log_must zfs destroy "$snap"
+		fi
+	done
+}
+
+log_assert "'zfs diff' should only work with supported options."
+log_onexit cleanup
+
+typeset goodopts=("" "-F" "-H" "-t" "-FH" "-Ft" "-Ht" "-FHt")
+typeset badopts=("-f" "-h" "-h" "-T" "-Fx" "-Ho" "-tT" "-")
+
+DATASET="$TESTPOOL/$TESTFS"
+TESTSNAP1="$DATASET@snap1"
+TESTSNAP2="$DATASET@snap2"
+
+# 1. Create two snapshots
+log_must zfs snapshot "$TESTSNAP1"
+log_must zfs snapshot "$TESTSNAP2"
+
+# 2. Verify every supported option is accepted
+for opt in ${goodopts[@]}
+do
+	log_must zfs diff $opt "$TESTSNAP1"
+	log_must zfs diff $opt "$TESTSNAP1" "$DATASET"
+	log_must zfs diff $opt "$TESTSNAP1" "$TESTSNAP2"
+done
+
+# 3. Verify supported options raise an error with unsupported arguments
+for opt in ${goodopts[@]}
+do
+	log_mustnot zfs diff $opt
+	log_mustnot zfs diff $opt "$DATASET"
+	log_mustnot zfs diff $opt "$DATASET@noexists"
+	log_mustnot zfs diff $opt "$DATASET" "$TESTSNAP1"
+	log_mustnot zfs diff $opt "$TESTSNAP2" "$TESTSNAP1"
+done
+
+# 4. Verify other unsupported options raise an error
+for opt in ${badopts[@]}
+do
+	log_mustnot zfs diff $opt "$TESTSNAP1" "$DATASET"
+	log_mustnot zfs diff $opt "$TESTSNAP1" "$TESTSNAP2"
+done
+
+log_pass "'zfs diff' only works with supported options."
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh
new file mode 100755
index 000000000..513d14c8d
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_timestamp.ksh
@@ -0,0 +1,100 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 'zfs diff -t' should display inode change time correctly.
+#
+# STRATEGY:
+# 1. Create a snapshot
+# 2. Create some files with a random delay and snapshot the filesystem again
+# 3. Verify 'zfs diff -t' correctly display timestamps
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	for snap in $TESTSNAP1 $TESTSNAP2; do
+		if snapexists "$snap"; then
+			log_must zfs destroy "$snap"
+		fi
+	done
+	find "$MNTPOINT" -type f -delete
+	rm -f "$FILEDIFF"
+}
+
+#
+# Creates $count files in $fspath. Waits a random delay between each file.
+#
+function create_random # <fspath> <count>
+{
+	fspath="$1"
+	typeset -i count="$2"
+	typeset -i i=0
+
+	while (( i < count )); do
+		log_must touch "$fspath/file$i"
+		sleep $(random 3)
+		(( i = i + 1 ))
+	done
+}
+
+log_assert "'zfs diff -t' should display inode change time correctly."
+log_onexit cleanup
+
+DATASET="$TESTPOOL/$TESTFS"
+TESTSNAP1="$DATASET@snap1"
+TESTSNAP2="$DATASET@snap2"
+MNTPOINT="$(get_prop mountpoint $DATASET)"
+FILEDIFF="$TESTDIR/zfs-diff.txt"
+FILENUM=5
+
+# 1. Create a snapshot
+log_must zfs snapshot "$TESTSNAP1"
+
+# 2. Create some files with a random delay and snapshot the filesystem again
+create_random "$MNTPOINT" $FILENUM
+log_must zfs snapshot "$TESTSNAP2"
+
+# 3. Verify 'zfs diff -t' correctly display timestamps
+typeset -i count=0
+log_must eval "zfs diff -t $TESTSNAP1 $TESTSNAP2 > $FILEDIFF"
+awk '{print substr($1,0,index($1,".")-1)" "$NF}' < "$FILEDIFF" | while read line
+do
+	read ctime file <<< "$line"
+
+	# If path from 'zfs diff' is not a file (could be xattr object) skip it
+	if [[ ! -f "$file" ]]; then
+		continue;
+	fi
+
+	filetime="$(stat -c '%Z' $file)"
+	if [[ "$filetime" != "$ctime" ]]; then
+		log_fail "Unexpected ctime for file $file ($filetime != $ctime)"
+	else
+		log_note "Correct ctime read on $file: $ctime"
+	fi
+
+	(( i = i + 1 ))
+done
+if [[ $i != $FILENUM ]]; then
+	log_fail "Wrong number of files verified ($i != $FILENUM)"
+fi
+
+log_pass "'zfs diff -t' displays inode change time correctly."
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_types.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_types.ksh
new file mode 100755
index 000000000..9c81084d1
--- /dev/null
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_diff/zfs_diff_types.ksh
@@ -0,0 +1,125 @@
+#!/bin/ksh -p
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2017, loli10K <[email protected]>. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# 'zfs diff -F' shows different object types correctly.
+#
+# STRATEGY:
+# 1. Prepare a dataset
+# 2. Create different objects and verify 'zfs diff -F' shows the correct type
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	log_must zfs destroy -r "$DATASET"
+	rm -f "$FILEDIFF"
+}
+
+#
+# Verify object at $path is of type $symbol using 'zfs diff -F'
+# Valid types are:
+# * B (Block device)
+# * C (Character device)
+# * / (Directory)
+# * > (Door)
+# * | (Named pipe)
+# * @ (Symbolic link)
+# * P (Event port)
+# * = (Socket)
+# * F (Regular file)
+#
+function verify_object_class # <path> <symbol>
+{
+	path="$1"
+	symbol="$2"
+
+	log_must eval "zfs diff -F $TESTSNAP1 $TESTSNAP2 > $FILEDIFF"
+	diffsym="$(awk -v path="$path" '$NF == path { print $2 }' < $FILEDIFF)"
+	if [[ "$diffsym" != "$symbol" ]]; then
+		log_fail "Unexpected type for $path ('$diffsym' != '$symbol')"
+	else
+		log_note "Object $path type is correctly displayed as '$symbol'"
+	fi
+
+	log_must zfs destroy "$TESTSNAP1"
+	log_must zfs destroy "$TESTSNAP2"
+}
+
+log_assert "'zfs diff -F' should show different object types correctly."
+log_onexit cleanup
+
+DATASET="$TESTPOOL/$TESTFS/fs"
+TESTSNAP1="$DATASET@snap1"
+TESTSNAP2="$DATASET@snap2"
+FILEDIFF="$TESTDIR/zfs-diff.txt"
+MAJOR=$(stat -c %t /dev/null)
+MINOR=$(stat -c %T /dev/null)
+
+# 1. Prepare a dataset
+log_must zfs create $DATASET
+MNTPOINT="$(get_prop mountpoint $DATASET)"
+log_must zfs set devices=on $DATASET
+log_must zfs set xattr=sa $DATASET
+
+# 2. Create different objects and verify 'zfs diff -F' shows the correct type
+# 2. F (Regular file)
+log_must zfs snapshot "$TESTSNAP1"
+log_must touch "$MNTPOINT/file"
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/file" "F"
+
+# 2. @ (Symbolic link)
+log_must zfs snapshot "$TESTSNAP1"
+log_must ln -s "$MNTPOINT/file" "$MNTPOINT/link"
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/link" "@"
+
+# 2. B (Block device)
+log_must zfs snapshot "$TESTSNAP1"
+log_must mknod "$MNTPOINT/bdev" b $MAJOR $MINOR
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/bdev" "B"
+
+# 2. C (Character device)
+log_must zfs snapshot "$TESTSNAP1"
+log_must mknod "$MNTPOINT/cdev" c $MAJOR $MINOR
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/cdev" "C"
+
+# 2. | (Named pipe)
+log_must zfs snapshot "$TESTSNAP1"
+log_must mknod "$MNTPOINT/fifo" p
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/fifo" "|"
+
+# 2. / (Directory)
+log_must zfs snapshot "$TESTSNAP1"
+log_must mkdir "$MNTPOINT/dir"
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/dir" "/"
+
+# 2. = (Socket)
+log_must zfs snapshot "$TESTSNAP1"
+log_must $STF_SUITE/tests/functional/cli_root/zfs_diff/socket "$MNTPOINT/sock"
+log_must zfs snapshot "$TESTSNAP2"
+verify_object_class "$MNTPOINT/sock" "="
+
+log_pass "'zfs diff -F' shows different object types correctly."