networkd: rework how carrier bindings are serialized

Instead of serializing the interface name, expose the interface index, since
that's the only stable identifier.

2 files changed, 54 insertions, 29 deletions

diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index c5da24e75b..8abb1eff9a 100644
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -662,6 +662,30 @@ static int dump_lldp_neighbors(const char *prefix, int ifindex) {
         return c;
 }
 
+static void dump_ifindexes(const char *prefix, const int *ifindexes) {
+        unsigned c;
+
+        assert(prefix);
+
+        if (!ifindexes || ifindexes[0] <= 0)
+                return;
+
+        for (c = 0; ifindexes[c] > 0; c++) {
+                char name[IF_NAMESIZE+1];
+
+                printf("%*s",
+                       (int) strlen(prefix),
+                       c == 0 ? prefix : "");
+
+                if (if_indextoname(ifindexes[c], name))
+                        fputs(name, stdout);
+                else
+                        printf("%i", ifindexes[c]);
+
+                fputc('\n', stdout);
+        }
+}
+
 static void dump_list(const char *prefix, char **l) {
         char **i;
 
@@ -689,8 +713,7 @@ static int link_status_one(
         const char *driver = NULL, *path = NULL, *vendor = NULL, *model = NULL, *link = NULL;
         const char *on_color_operational, *off_color_operational,
                    *on_color_setup, *off_color_setup;
-        _cleanup_strv_free_ char **carrier_bound_to = NULL;
-        _cleanup_strv_free_ char **carrier_bound_by = NULL;
+        _cleanup_free_ int *carrier_bound_to = NULL, *carrier_bound_by = NULL;
         int r;
 
         assert(rtnl);
@@ -777,8 +800,8 @@ static int link_status_one(
 
         dump_list("             NTP: ", ntp);
 
-        dump_list("Carrier Bound To: ", carrier_bound_to);
-        dump_list("Carrier Bound By: ", carrier_bound_by);
+        dump_ifindexes("Carrier Bound To: ", carrier_bound_to);
+        dump_ifindexes("Carrier Bound By: ", carrier_bound_by);
 
         (void) sd_network_link_get_timezone(info->ifindex, &tz);
         if (tz)
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 02fb04e0cb..32437d2195 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1622,7 +1622,7 @@ static int link_new_bound_by_list(Link *link) {
 
         m = link->manager;
 
-        HASHMAP_FOREACH (carrier, m->links, i) {
+        HASHMAP_FOREACH(carrier, m->links, i) {
                 if (!carrier->network)
                         continue;
 
@@ -1641,7 +1641,7 @@ static int link_new_bound_by_list(Link *link) {
         if (list_updated)
                 link_dirty(link);
 
-        HASHMAP_FOREACH (carrier, link->bound_by_links, i) {
+        HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
                 if (r < 0)
                         return r;
@@ -2631,7 +2631,6 @@ int link_carrier_reset(Link *link) {
         return 0;
 }
 
-
 int link_update(Link *link, sd_netlink_message *m) {
         struct ether_addr mac;
         const char *ifname;
@@ -2752,12 +2751,34 @@ int link_update(Link *link, sd_netlink_message *m) {
                 r = link_carrier_lost(link);
                 if (r < 0)
                         return r;
-
         }
 
         return 0;
 }
 
+static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
+        bool space = false;
+        Iterator i;
+        Link *link;
+
+        assert(f);
+        assert(prefix);
+
+        if (hashmap_isempty(h))
+                return;
+
+        fputs(prefix, f);
+        HASHMAP_FOREACH(link, h, i) {
+                if (space)
+                        fputc(' ', f);
+
+                fprintf(f, "%i", link->ifindex);
+                space = true;
+        }
+
+        fputc('\n', f);
+}
+
 int link_save(Link *link) {
         _cleanup_free_ char *temp_path = NULL;
         _cleanup_fclose_ FILE *f = NULL;
@@ -2958,27 +2979,8 @@ int link_save(Link *link) {
                 fputc('\n', f);
         }
 
-        if (!hashmap_isempty(link->bound_to_links)) {
-                Link *carrier;
-                bool space = false;
-
-                fputs("CARRIER_BOUND_TO=", f);
-                HASHMAP_FOREACH(carrier, link->bound_to_links, i)
-                        fputs_with_space(f, carrier->ifname, NULL, &space);
-
-                fputc('\n', f);
-        }
-
-        if (!hashmap_isempty(link->bound_by_links)) {
-                Link *carrier;
-                bool space = false;
-
-                fputs("CARRIER_BOUND_BY=", f);
-                HASHMAP_FOREACH(carrier, link->bound_by_links, i)
-                        fputs_with_space(f, carrier->ifname, NULL, &space);
-
-                fputc('\n', f);
-        }
+        print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
+        print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
 
         if (link->dhcp_lease) {
                 struct in_addr address;