JSON output support for zpool status

This commit adds support for zpool status command to displpay status
of ZFS pools in JSON format using '-j' option. Status information is
collected in nvlist which is later dumped on stdout in JSON format.
Existing options for zpool status work with '-j' flag. man page for
zpool status is updated accordingly.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #16217

include/libzfs.h

@@ -469,7 +469,8 @@ _LIBZFS_H int zpool_import(libzfs_handle_t *, nvlist_t *, const char *,
     char *altroot);
 _LIBZFS_H int zpool_import_props(libzfs_handle_t *, nvlist_t *, const char *,
     nvlist_t *, int);
-_LIBZFS_H void zpool_print_unsup_feat(nvlist_t *config);
+_LIBZFS_H void zpool_collect_unsup_feat(nvlist_t *config, char *buf,
+    size_t size);
 
 /*
  * Miscellaneous pool functions
@@ -500,7 +501,7 @@ _LIBZFS_H void zpool_obj_to_path(zpool_handle_t *, uint64_t, uint64_t, char *,
     size_t);
 _LIBZFS_H int zfs_ioctl(libzfs_handle_t *, int, struct zfs_cmd *);
 _LIBZFS_H void zpool_explain_recover(libzfs_handle_t *, const char *, int,
-    nvlist_t *);
+    nvlist_t *, char *, size_t);
 _LIBZFS_H int zpool_checkpoint(zpool_handle_t *);
 _LIBZFS_H int zpool_discard_checkpoint(zpool_handle_t *);
 _LIBZFS_H boolean_t zpool_is_draid_spare(const char *);

lib/libspl/include/statcommon.h

@@ -39,5 +39,7 @@
 void print_timestamp(uint_t);
 /* Return timestamp in either Unix or standard format in provided buffer */
 void get_timestamp(uint_t, char *, int);
+/* convert time_t to standard format */
+void format_timestamp(time_t, char *, int);
 
 #endif /* _STATCOMMON_H */

lib/libspl/timestamp.c

@@ -84,3 +84,23 @@ get_timestamp(uint_t timestamp_fmt, char *buf, int len)
 		strftime(buf, len, fmt, localtime_r(&t, &tm));
 	}
 }
+
+/*
+ * Format the provided time stamp to human readable format
+ */
+void
+format_timestamp(time_t t, char *buf, int len)
+{
+	struct tm tm;
+	static const char *fmt = NULL;
+
+	if (t == 0) {
+		snprintf(buf, len, "-");
+		return;
+	}
+
+	/* We only need to retrieve this once per invocation */
+	if (fmt == NULL)
+		fmt = nl_langinfo(_DATE_FMT);
+	strftime(buf, len, fmt, localtime_r(&t, &tm));
+}

lib/libuutil/libuutil.abi

@@ -143,7 +143,9 @@
     <elf-symbol name='avl_update_gt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='avl_update_lt' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='avl_walk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='format_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='get_system_hostid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='get_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getexecname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getextmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getmntany' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -1151,6 +1153,18 @@
       <parameter type-id='3502e3ff' name='timestamp_fmt'/>
       <return type-id='48b5725f'/>
     </function-decl>
+    <function-decl name='get_timestamp' mangled-name='get_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='get_timestamp'>
+      <parameter type-id='3502e3ff' name='timestamp_fmt'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
+    <function-decl name='format_timestamp' mangled-name='format_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='format_timestamp'>
+      <parameter type-id='c9d12d66' name='t'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
   </abi-instr>
   <abi-instr address-size='64' path='lib/libuutil/uu_alloc.c' language='LANG_C99'>
     <type-decl name='char' size-in-bits='8' id='a84c031d'/>

lib/libzfs/libzfs.abi

@@ -179,10 +179,12 @@
     <elf-symbol name='fletcher_4_native' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='fletcher_4_native_varsize' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='fletcher_init' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='format_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='fsleep' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='get_dataset_depth' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='get_system_hostid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getexecname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='get_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getextmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getmntany' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getprop_uint64' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -280,6 +282,7 @@
     <elf-symbol name='vdev_prop_to_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='vdev_prop_user' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='vdev_prop_values' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='zcmd_print_json' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfeature_depends_on' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfeature_is_supported' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfeature_is_valid_guid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -452,6 +455,7 @@
     <elf-symbol name='zfs_userspace' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfs_valid_proplist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfs_version_kernel' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='zfs_version_nvlist' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfs_version_print' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfs_version_userland' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zfs_wait_status' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -524,7 +528,7 @@
     <elf-symbol name='zpool_prefetch' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_prepare_and_label_disk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_prepare_disk' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
-    <elf-symbol name='zpool_print_unsup_feat' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='zpool_collect_unsup_feat' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_prop_align_right' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_prop_column_name' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_prop_default_numeric' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -577,12 +581,14 @@
     <elf-symbol name='zpool_vdev_split' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_wait' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zpool_wait_status' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='zprop_collect_property' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_free_list' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_get_list' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_index_to_string' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_iter' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_iter_common' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_name_to_prop' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='zprop_nvlist_one_property' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_print_one_property' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_random_value' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='zprop_register_hidden' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -1284,6 +1290,18 @@
       <parameter type-id='3502e3ff' name='timestamp_fmt'/>
       <return type-id='48b5725f'/>
     </function-decl>
+    <function-decl name='get_timestamp' mangled-name='get_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='get_timestamp'>
+      <parameter type-id='3502e3ff' name='timestamp_fmt'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
+    <function-decl name='format_timestamp' mangled-name='format_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='format_timestamp'>
+      <parameter type-id='c9d12d66' name='t'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
   </abi-instr>
   <abi-instr address-size='64' path='lib/libtpool/thread_pool.c' language='LANG_C99'>
     <array-type-def dimensions='1' type-id='49ef3ffd' size-in-bits='1024' id='a14403f5'>
@@ -6456,6 +6474,8 @@
       <parameter type-id='80f4b756' name='name'/>
       <parameter type-id='95e97e5e' name='reason'/>
       <parameter type-id='5ce45b60' name='config'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='b59d7dce' name='size'/>
       <return type-id='48b5725f'/>
     </function-decl>
     <function-decl name='zpool_import' mangled-name='zpool_import' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import'>
@@ -6465,8 +6485,10 @@
       <parameter type-id='26a90f95' name='altroot'/>
       <return type-id='95e97e5e'/>
     </function-decl>
-    <function-decl name='zpool_print_unsup_feat' mangled-name='zpool_print_unsup_feat' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_print_unsup_feat'>
+    <function-decl name='zpool_collect_unsup_feat' mangled-name='zpool_collect_unsup_feat' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_collect_unsup_feat'>
       <parameter type-id='5ce45b60' name='config'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='b59d7dce' name='size'/>
       <return type-id='48b5725f'/>
     </function-decl>
     <function-decl name='zpool_import_props' mangled-name='zpool_import_props' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zpool_import_props'>
@@ -8194,6 +8216,20 @@
       <parameter type-id='2e45de5d' name='argtype'/>
       <return type-id='9200a744'/>
     </function-decl>
+    <function-decl name='zcmd_print_json' mangled-name='zcmd_print_json' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zcmd_print_json'>
+      <parameter type-id='5ce45b60' name='nvl'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
+    <function-decl name='zprop_nvlist_one_property' mangled-name='zprop_nvlist_one_property' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_nvlist_one_property'>
+      <parameter type-id='80f4b756' name='propname'/>
+      <parameter type-id='80f4b756' name='value'/>
+      <parameter type-id='a2256d42' name='sourcetype'/>
+      <parameter type-id='80f4b756' name='source'/>
+      <parameter type-id='80f4b756' name='recvd_value'/>
+      <parameter type-id='5ce45b60' name='nvl'/>
+      <parameter type-id='c19b74c3' name='as_int'/>
+      <return type-id='95e97e5e'/>
+    </function-decl>
     <function-decl name='zprop_print_one_property' mangled-name='zprop_print_one_property' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_print_one_property'>
       <parameter type-id='80f4b756' name='name'/>
       <parameter type-id='0d2a0670' name='cbp'/>
@@ -8204,6 +8240,17 @@
       <parameter type-id='80f4b756' name='recvd_value'/>
       <return type-id='48b5725f'/>
     </function-decl>
+    <function-decl name='zprop_collect_property' mangled-name='zprop_collect_property' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_collect_property'>
+      <parameter type-id='80f4b756' name='name'/>
+      <parameter type-id='0d2a0670' name='cbp'/>
+      <parameter type-id='80f4b756' name='propname'/>
+      <parameter type-id='80f4b756' name='value'/>
+      <parameter type-id='a2256d42' name='sourcetype'/>
+      <parameter type-id='80f4b756' name='source'/>
+      <parameter type-id='80f4b756' name='recvd_value'/>
+      <parameter type-id='5ce45b60' name='nvl'/>
+      <return type-id='95e97e5e'/>
+    </function-decl>
     <function-decl name='zprop_get_list' mangled-name='zprop_get_list' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zprop_get_list'>
       <parameter type-id='b0382bb3' name='hdl'/>
       <parameter type-id='26a90f95' name='props'/>
@@ -8232,6 +8279,9 @@
     <function-decl name='use_color' mangled-name='use_color' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='use_color'>
       <return type-id='95e97e5e'/>
     </function-decl>
+    <function-decl name='zfs_version_nvlist' mangled-name='zfs_version_nvlist' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_version_nvlist'>
+      <return type-id='5ce45b60'/>
+    </function-decl>
     <function-decl name='printf_color' mangled-name='printf_color' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='printf_color'>
       <parameter type-id='80f4b756' name='color'/>
       <parameter type-id='80f4b756' name='format'/>

lib/libzfs/libzfs_pool.c

@@ -1990,23 +1990,18 @@ zpool_rewind_exclaim(libzfs_handle_t *hdl, const char *name, boolean_t dryrun,
 
 void
 zpool_explain_recover(libzfs_handle_t *hdl, const char *name, int reason,
-    nvlist_t *config)
+    nvlist_t *config, char *buf, size_t size)
 {
 	nvlist_t *nv = NULL;
 	int64_t loss = -1;
 	uint64_t edata = UINT64_MAX;
 	uint64_t rewindto;
 	struct tm t;
-	char timestr[128];
+	char timestr[128], temp[1024];
 
 	if (!hdl->libzfs_printerr)
 		return;
 
-	if (reason >= 0)
-		(void) printf(dgettext(TEXT_DOMAIN, "action: "));
-	else
-		(void) printf(dgettext(TEXT_DOMAIN, "\t"));
-
 	/* All attempted rewinds failed if ZPOOL_CONFIG_LOAD_TIME missing */
 	if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, &nv) != 0 ||
 	    nvlist_lookup_nvlist(nv, ZPOOL_CONFIG_REWIND_INFO, &nv) != 0 ||
@@ -2017,56 +2012,61 @@ zpool_explain_recover(libzfs_handle_t *hdl, const char *name, int reason,
 	(void) nvlist_lookup_uint64(nv, ZPOOL_CONFIG_LOAD_DATA_ERRORS,
 	    &edata);
 
-	(void) printf(dgettext(TEXT_DOMAIN,
+	(void) snprintf(buf, size, dgettext(TEXT_DOMAIN,
 	    "Recovery is possible, but will result in some data loss.\n"));
 
 	if (localtime_r((time_t *)&rewindto, &t) != NULL &&
 	    ctime_r((time_t *)&rewindto, timestr) != NULL) {
 		timestr[24] = 0;
-		(void) printf(dgettext(TEXT_DOMAIN,
+		(void) snprintf(temp, 1024, dgettext(TEXT_DOMAIN,
 		    "\tReturning the pool to its state as of %s\n"
-		    "\tshould correct the problem.  "),
+		    "\tshould correct the problem.  "), timestr);
-		    timestr);
+		(void) strlcat(buf, temp, size);
 	} else {
-		(void) printf(dgettext(TEXT_DOMAIN,
+		(void) strlcat(buf, dgettext(TEXT_DOMAIN,
 		    "\tReverting the pool to an earlier state "
-		    "should correct the problem.\n\t"));
+		    "should correct the problem.\n\t"), size);
 	}
 
 	if (loss > 120) {
-		(void) printf(dgettext(TEXT_DOMAIN,
+		(void) snprintf(temp, 1024, dgettext(TEXT_DOMAIN,
 		    "Approximately %lld minutes of data\n"
 		    "\tmust be discarded, irreversibly.  "),
 		    ((longlong_t)loss + 30) / 60);
+		(void) strlcat(buf, temp, size);
 	} else if (loss > 0) {
-		(void) printf(dgettext(TEXT_DOMAIN,
+		(void) snprintf(temp, 1024, dgettext(TEXT_DOMAIN,
 		    "Approximately %lld seconds of data\n"
 		    "\tmust be discarded, irreversibly.  "),
 		    (longlong_t)loss);
+		(void) strlcat(buf, temp, size);
 	}
 	if (edata != 0 && edata != UINT64_MAX) {
 		if (edata == 1) {
-			(void) printf(dgettext(TEXT_DOMAIN,
+			(void) strlcat(buf, dgettext(TEXT_DOMAIN,
 			    "After rewind, at least\n"
-			    "\tone persistent user-data error will remain.  "));
+			    "\tone persistent user-data error will remain.  "),
+			    size);
 		} else {
-			(void) printf(dgettext(TEXT_DOMAIN,
+			(void) strlcat(buf, dgettext(TEXT_DOMAIN,
 			    "After rewind, several\n"
-			    "\tpersistent user-data errors will remain.  "));
+			    "\tpersistent user-data errors will remain.  "),
+			    size);
 		}
 	}
-	(void) printf(dgettext(TEXT_DOMAIN,
+	(void) snprintf(temp, 1024, dgettext(TEXT_DOMAIN,
 	    "Recovery can be attempted\n\tby executing 'zpool %s -F %s'.  "),
 	    reason >= 0 ? "clear" : "import", name);
+	(void) strlcat(buf, temp, size);
 
-	(void) printf(dgettext(TEXT_DOMAIN,
+	(void) strlcat(buf, dgettext(TEXT_DOMAIN,
 	    "A scrub of the pool\n"
-	    "\tis strongly recommended after recovery.\n"));
+	    "\tis strongly recommended after recovery.\n"), size);
 	return;
 
 no_info:
-	(void) printf(dgettext(TEXT_DOMAIN,
+	(void) strlcat(buf, dgettext(TEXT_DOMAIN,
-	    "Destroy and re-create the pool from\n\ta backup source.\n"));
+	    "Destroy and re-create the pool from\n\ta backup source.\n"), size);
 }
 
 /*
@@ -2135,9 +2135,10 @@ print_vdev_tree(libzfs_handle_t *hdl, const char *name, nvlist_t *nv,
 }
 
 void
-zpool_print_unsup_feat(nvlist_t *config)
+zpool_collect_unsup_feat(nvlist_t *config, char *buf, size_t size)
 {
 	nvlist_t *nvinfo, *unsup_feat;
+	char temp[512];
 
 	nvinfo = fnvlist_lookup_nvlist(config, ZPOOL_CONFIG_LOAD_INFO);
 	unsup_feat = fnvlist_lookup_nvlist(nvinfo, ZPOOL_CONFIG_UNSUP_FEAT);
@@ -2145,10 +2146,14 @@ zpool_print_unsup_feat(nvlist_t *config)
 	for (nvpair_t *nvp = nvlist_next_nvpair(unsup_feat, NULL);
 	    nvp != NULL; nvp = nvlist_next_nvpair(unsup_feat, nvp)) {
 		const char *desc = fnvpair_value_string(nvp);
-		if (strlen(desc) > 0)
+		if (strlen(desc) > 0) {
-			(void) printf("\t%s (%s)\n", nvpair_name(nvp), desc);
+			(void) snprintf(temp, 512, "\t%s (%s)\n",
-		else
+			    nvpair_name(nvp), desc);
-			(void) printf("\t%s\n", nvpair_name(nvp));
+			(void) strlcat(buf, temp, size);
+		} else {
+			(void) snprintf(temp, 512, "\t%s\n", nvpair_name(nvp));
+			(void) strlcat(buf, temp, size);
+		}
 	}
 }
 
@@ -2171,6 +2176,7 @@ zpool_import_props(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
 	const char *origname;
 	int ret;
 	int error = 0;
+	char buf[2048];
 	char errbuf[ERRBUFLEN];
 
 	origname = fnvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME);
@@ -2253,7 +2259,9 @@ zpool_import_props(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
 				(void) printf(dgettext(TEXT_DOMAIN, "This "
 				    "pool uses the following feature(s) not "
 				    "supported by this system:\n"));
-				zpool_print_unsup_feat(nv);
+				memset(buf, 0, 2048);
+				zpool_collect_unsup_feat(nv, buf, 2048);
+				(void) printf("%s", buf);
 				if (nvlist_exists(nvinfo,
 				    ZPOOL_CONFIG_CAN_RDONLY)) {
 					(void) printf(dgettext(TEXT_DOMAIN,
@@ -2352,8 +2360,11 @@ zpool_import_props(libzfs_handle_t *hdl, nvlist_t *config, const char *newname,
 			break;
 		default:
 			(void) zpool_standard_error(hdl, error, desc);
+			memset(buf, 0, 2048);
 			zpool_explain_recover(hdl,
-			    newname ? origname : thename, -error, nv);
+			    newname ? origname : thename, -error, nv,
+			    buf, 2048);
+			(void) printf("\t%s", buf);
 			break;
 		}
 

lib/libzfs_core/libzfs_core.abi

@@ -126,7 +126,9 @@
     <elf-symbol name='atomic_swap_uint' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='atomic_swap_ulong' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='atomic_swap_ushort' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='format_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='get_system_hostid' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
+    <elf-symbol name='get_timestamp' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getexecname' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getextmntent' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
     <elf-symbol name='getmntany' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
@@ -1110,6 +1112,18 @@
       <parameter type-id='3502e3ff' name='timestamp_fmt'/>
       <return type-id='48b5725f'/>
     </function-decl>
+    <function-decl name='get_timestamp' mangled-name='get_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='get_timestamp'>
+      <parameter type-id='3502e3ff' name='timestamp_fmt'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
+    <function-decl name='format_timestamp' mangled-name='format_timestamp' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='format_timestamp'>
+      <parameter type-id='c9d12d66' name='t'/>
+      <parameter type-id='26a90f95' name='buf'/>
+      <parameter type-id='95e97e5e' name='len'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
   </abi-instr>
   <abi-instr address-size='64' path='lib/libzfs_core/libzfs_core.c' language='LANG_C99'>
     <array-type-def dimensions='1' type-id='03085adc' size-in-bits='192' id='083f8d58'>

man/man8/zpool-status.8

@@ -41,6 +41,7 @@
 .Op Fl c Op Ar SCRIPT1 Ns Oo , Ns Ar SCRIPT2 Oc Ns …
 .Oo Ar pool Oc Ns …
 .Op Ar interval Op Ar count
+.Op Fl j Op Ar --json-int, --json-flat-vdevs, --json-pool-key-guid
 .
 .Sh DESCRIPTION
 Displays the detailed health status for the given pools.
@@ -69,6 +70,17 @@ See the
 option of
 .Nm zpool Cm iostat
 for complete details.
+.It Fl j Op Ar --json-int, --json-flat-vdevs, --json-pool-key-guid
+Display the status for ZFS pools in JSON format.
+Specify
+.Sy --json-int
+to display numbers in integer format instead of strings.
+Specify
+.Sy --json-flat-vdevs
+to display vdevs in flat hierarchy instead of nested vdev objects.
+Specify
+.Sy --json-pool-key-guid
+to set pool GUID as key for pool objects instead of pool names.
 .It Fl D
 Display a histogram of deduplication statistics, showing the allocated
 .Pq physically present on disk
@@ -161,6 +173,175 @@ rpool       14.6G  54.9G      4     55   250K  2.69M
 ----------  -----  -----  -----  -----  -----  -----  ----
 .Ed
 .
+.Ss Example 2 : No Display the status output in JSON format
+.Nm zpool Cm status No can output in JSON format if
+.Fl j
+is specified.
+.Fl c
+can be used to run a script on each VDEV.
+.Bd -literal -compact -offset Ds
+.No # Nm zpool Cm status Fl j Fl c Pa vendor , Ns Pa model , Ns Pa size | Nm jq
+{
+  "output_version": {
+    "command": "zpool status",
+    "vers_major": 0,
+    "vers_minor": 1
+  },
+  "pools": {
+    "tank": {
+      "name": "tank",
+      "state": "ONLINE",
+      "guid": "3920273586464696295",
+      "txg": "16597",
+      "spa_version": "5000",
+      "zpl_version": "5",
+      "status": "OK",
+      "vdevs": {
+        "tank": {
+          "name": "tank",
+          "alloc_space": "62.6G",
+          "total_space": "15.0T",
+          "def_space": "11.3T",
+          "read_errors": "0",
+          "write_errors": "0",
+          "checksum_errors": "0",
+          "vdevs": {
+            "raidz1-0": {
+              "name": "raidz1-0",
+              "vdev_type": "raidz",
+              "guid": "763132626387621737",
+              "state": "HEALTHY",
+              "alloc_space": "62.5G",
+              "total_space": "10.9T",
+              "def_space": "7.26T",
+              "rep_dev_size": "10.9T",
+              "read_errors": "0",
+              "write_errors": "0",
+              "checksum_errors": "0",
+              "vdevs": {
+                "ca1eb824-c371-491d-ac13-37637e35c683": {
+                  "name": "ca1eb824-c371-491d-ac13-37637e35c683",
+                  "vdev_type": "disk",
+                  "guid": "12841765308123764671",
+                  "path": "/dev/disk/by-partuuid/ca1eb824-c371-491d-ac13-37637e35c683",
+                  "state": "HEALTHY",
+                  "rep_dev_size": "3.64T",
+                  "phys_space": "3.64T",
+                  "read_errors": "0",
+                  "write_errors": "0",
+                  "checksum_errors": "0",
+                  "vendor": "ATA",
+                  "model": "WDC WD40EFZX-68AWUN0",
+                  "size": "3.6T"
+                },
+                "97cd98fb-8fb8-4ac4-bc84-bd8950a7ace7": {
+                  "name": "97cd98fb-8fb8-4ac4-bc84-bd8950a7ace7",
+                  "vdev_type": "disk",
+                  "guid": "1527839927278881561",
+                  "path": "/dev/disk/by-partuuid/97cd98fb-8fb8-4ac4-bc84-bd8950a7ace7",
+                  "state": "HEALTHY",
+                  "rep_dev_size": "3.64T",
+                  "phys_space": "3.64T",
+                  "read_errors": "0",
+                  "write_errors": "0",
+                  "checksum_errors": "0",
+                  "vendor": "ATA",
+                  "model": "WDC WD40EFZX-68AWUN0",
+                  "size": "3.6T"
+                },
+                "e9ddba5f-f948-4734-a472-cb8aa5f0ff65": {
+                  "name": "e9ddba5f-f948-4734-a472-cb8aa5f0ff65",
+                  "vdev_type": "disk",
+                  "guid": "6982750226085199860",
+                  "path": "/dev/disk/by-partuuid/e9ddba5f-f948-4734-a472-cb8aa5f0ff65",
+                  "state": "HEALTHY",
+                  "rep_dev_size": "3.64T",
+                  "phys_space": "3.64T",
+                  "read_errors": "0",
+                  "write_errors": "0",
+                  "checksum_errors": "0",
+                  "vendor": "ATA",
+                  "model": "WDC WD40EFZX-68AWUN0",
+                  "size": "3.6T"
+                }
+              }
+            }
+          }
+        }
+      },
+      "dedup": {
+        "mirror-2": {
+          "name": "mirror-2",
+          "vdev_type": "mirror",
+          "guid": "2227766268377771003",
+          "state": "HEALTHY",
+          "alloc_space": "89.1M",
+          "total_space": "3.62T",
+          "def_space": "3.62T",
+          "rep_dev_size": "3.62T",
+          "read_errors": "0",
+          "write_errors": "0",
+          "checksum_errors": "0",
+          "vdevs": {
+            "db017360-d8e9-4163-961b-144ca75293a3": {
+              "name": "db017360-d8e9-4163-961b-144ca75293a3",
+              "vdev_type": "disk",
+              "guid": "17880913061695450307",
+              "path": "/dev/disk/by-partuuid/db017360-d8e9-4163-961b-144ca75293a3",
+              "state": "HEALTHY",
+              "rep_dev_size": "3.63T",
+              "phys_space": "3.64T",
+              "read_errors": "0",
+              "write_errors": "0",
+              "checksum_errors": "0",
+              "vendor": "ATA",
+              "model": "WDC WD40EFZX-68AWUN0",
+              "size": "3.6T"
+            },
+            "952c3baf-b08a-4a8c-b7fa-33a07af5fe6f": {
+              "name": "952c3baf-b08a-4a8c-b7fa-33a07af5fe6f",
+              "vdev_type": "disk",
+              "guid": "10276374011610020557",
+              "path": "/dev/disk/by-partuuid/952c3baf-b08a-4a8c-b7fa-33a07af5fe6f",
+              "state": "HEALTHY",
+              "rep_dev_size": "3.63T",
+              "phys_space": "3.64T",
+              "read_errors": "0",
+              "write_errors": "0",
+              "checksum_errors": "0",
+              "vendor": "ATA",
+              "model": "WDC WD40EFZX-68AWUN0",
+              "size": "3.6T"
+            }
+          }
+        }
+      },
+      "special": {
+        "25d418f8-92bd-4327-b59f-7ef5d5f50d81": {
+          "name": "25d418f8-92bd-4327-b59f-7ef5d5f50d81",
+          "vdev_type": "disk",
+          "guid": "3935742873387713123",
+          "path": "/dev/disk/by-partuuid/25d418f8-92bd-4327-b59f-7ef5d5f50d81",
+          "state": "HEALTHY",
+          "alloc_space": "37.4M",
+          "total_space": "444G",
+          "def_space": "444G",
+          "rep_dev_size": "444G",
+          "phys_space": "447G",
+          "read_errors": "0",
+          "write_errors": "0",
+          "checksum_errors": "0",
+          "vendor": "ATA",
+          "model": "Micron_5300_MTFDDAK480TDS",
+          "size": "447.1G"
+        }
+      },
+      "error_count": "0"
+    }
+  }
+}
+.Ed
+.
 .Sh SEE ALSO
 .Xr zpool-events 8 ,
 .Xr zpool-history 8 ,