Add JSON output to zpool status

Add a new option j to the zpool status command to cause json dump
of pool status to stdout

Co-authored-by: Stuart Maybee <smaybee@cray.com>
Co-authored-by: Olaf Faaland <faaland1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

cmd/zpool/zpool_main.c

@@ -420,7 +420,7 @@ get_usage(zpool_help_t idx)
 		    "[<device> ...]\n"));
 	case HELP_STATUS:
 		return (gettext("\tstatus [--power] [-c [script1,script2,...]] "
-		    "[-DegiLpPstvx] [-T d|u] [pool] ...\n"
+		    "[-DegijLpPstvx] [-T d|u] [pool] ...\n"
 		    "\t    [interval [count]]\n"));
 	case HELP_UPGRADE:
 		return (gettext("\tupgrade\n"
@@ -2211,6 +2211,7 @@ typedef struct status_cbdata {
 	boolean_t	cb_print_vdev_trim;
 	vdev_cmd_data_list_t	*vcdl;
 	boolean_t	cb_print_power;
+	boolean_t	cb_print_json;
 } status_cbdata_t;
 
 /* Return 1 if string is NULL, empty, or whitespace; return 0 otherwise. */
@@ -8629,6 +8630,11 @@ status_callback(zpool_handle_t *zhp, void *data)
 
 	cbp->cb_count++;
 
+	if (cbp->cb_print_json) {
+		(void) nvlist_print_json(stdout, config);
+		return (0);
+	}
+
 	/*
 	 * If we were given 'zpool status -x', only report those pools with
 	 * problems.
@@ -9110,14 +9116,15 @@ status_callback(zpool_handle_t *zhp, void *data)
 }
 
 /*
- * zpool status [-c [script1,script2,...]] [-DegiLpPstvx] [--power] [-T d|u] ...
+ * zpool status [-c [script1,script2,...]] [-DegijLpPstvx] [--power] [-T d|u]
  *              [pool] [interval [count]]
  *
  *	-c CMD	For each vdev, run command CMD
  *	-D	Display dedup status (undocumented)
  *	-e	Display only unhealthy vdevs
  *	-g	Display guid for individual vdev name.
  *	-i	Display vdev initialization status.
+ *	-j	Output json rather than formatted text.
  *	-L	Follow links when resolving vdev path name.
  *	-p	Display values in parsable (exact) format.
  *	-P	Display full path for vdev name.
@@ -9146,7 +9153,7 @@ zpool_do_status(int argc, char **argv)
 	};
 
 	/* check options */
-	while ((c = getopt_long(argc, argv, "c:DegiLpPstT:vx", long_options,
+	while ((c = getopt_long(argc, argv, "c:DegijLpPstT:vx", long_options,
 	    NULL)) != -1) {
 		switch (c) {
 		case 'c':
@@ -9185,6 +9192,9 @@ zpool_do_status(int argc, char **argv)
 		case 'i':
 			cb.cb_print_vdev_init = B_TRUE;
 			break;
+		case 'j':
+			cb.cb_print_json = B_TRUE;
+			break;
 		case 'L':
 			cb.cb_name_flags |= VDEV_NAME_FOLLOW_LINKS;
 			break;

man/man8/zpool-status.8

@@ -36,7 +36,7 @@
 .Sh SYNOPSIS
 .Nm zpool
 .Cm status
-.Op Fl DegiLpPstvx
+.Op Fl DegijLpPstvx
 .Op Fl T Sy u Ns | Ns Sy d
 .Op Fl c Op Ar SCRIPT1 Ns Oo , Ns Ar SCRIPT2 Oc Ns …
 .Oo Ar pool Oc Ns …
@@ -83,6 +83,10 @@ These GUIDs can be used in place of device names for the zpool
 detach/offline/remove/replace commands.
 .It Fl i
 Display vdev initialization status.
+.It Fl j
+Provides a JSON formatted dump of the given pools complete status on stdout
+rather than output formatted for easy human readability.
+Selecting JSON output causes other status display options to be ignored.
 .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