[PATCH iproute2-next] netns: add JSON support

[Stephen Hemminger]

From: Stephen Hemminger <sthem...@microsoft.com>

Basic support for JSON output when showing network namespaces.

Signed-off-by: Stephen Hemminger <step...@networkplumber.org>
---
 ip/ipnetns.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 631794b8a341..e06100f4ad2d 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -22,6 +22,7 @@
 #include "list.h"
 #include "ip_common.h"
 #include "namespace.h"
+#include "json_print.h"
 
 static int usage(void)
 {
@@ -293,26 +294,30 @@ int print_nsid(const struct sockaddr_nl *who, struct 
nlmsghdr *n, void *arg)
                return -1;
        }
 
+       open_json_object(NULL);
        if (n->nlmsg_type == RTM_DELNSID)
-               fprintf(fp, "Deleted ");
+               print_bool(PRINT_ANY, "deleted", "Deleted ", true);
 
        nsid = rta_getattr_u32(tb[NETNSA_NSID]);
-       fprintf(fp, "nsid %u ", nsid);
+       print_uint(PRINT_ANY, "nsid", "nsid %u ", nsid);
 
        c = netns_map_get_by_nsid(nsid);
        if (c != NULL) {
-               fprintf(fp, "(iproute2 netns name: %s)", c->name);
+               print_string(PRINT_ANY, "name",
+                            "(iproute2 netns name: %s)", c->name);
                netns_map_del(c);
        }
 
        /* During 'ip monitor nsid', no chance to have new nsid in cache. */
        if (c == NULL && n->nlmsg_type == RTM_NEWNSID)
                if (netns_get_name(nsid, name) == 0) {
-                       fprintf(fp, "(iproute2 netns name: %s)", name);
+                       print_string(PRINT_ANY, "name",
+                                    "(iproute2 netns name: %s)", name);
                        netns_map_add(nsid, name);
                }
 
-       fprintf(fp, "\n");
+       print_string(PRINT_FP, NULL, "\n", NULL);
+       close_json_object();
        fflush(fp);
        return 0;
 }
@@ -329,10 +334,14 @@ static int netns_list_id(int argc, char **argv)
                perror("Cannot send dump request");
                exit(1);
        }
+
+       new_json_obj(json);
        if (rtnl_dump_filter(&rth, print_nsid, stdout) < 0) {
+               delete_json_obj();
                fprintf(stderr, "Dump terminated\n");
                exit(1);
        }
+       delete_json_obj();
        return 0;
 }
 
@@ -346,20 +355,27 @@ static int netns_list(int argc, char **argv)
        if (!dir)
                return 0;
 
+       new_json_obj(json);
        while ((entry = readdir(dir)) != NULL) {
                if (strcmp(entry->d_name, ".") == 0)
                        continue;
                if (strcmp(entry->d_name, "..") == 0)
                        continue;
-               printf("%s", entry->d_name);
+
+               open_json_object(NULL);
+               print_string(PRINT_ANY, "name",
+                            "%s", entry->d_name);
                if (ipnetns_have_nsid()) {
                        id = get_netnsid_from_name(entry->d_name);
                        if (id >= 0)
-                               printf(" (id: %d)", id);
+                               print_uint(PRINT_ANY, "id",
+                                          " (id: %d)", id);
                }
-               printf("\n");
+               print_string(PRINT_FP, NULL, "\n", NULL);
+               close_json_object();
        }
        closedir(dir);
+       delete_json_obj();
        return 0;
 }
 
-- 
2.16.1