From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Thu, 20 Jan 2022 19:32:38 +0000 (+0900)
Subject: resolve: add debuging log of interface name change
X-Git-Tag: v251-rc1~486^2~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57786db7978116b7a3414baad908a8c92ed33abb;p=thirdparty%2Fsystemd.git

resolve: add debuging log of interface name change
---

diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index 6c910498a25..335862b80e1 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -237,7 +237,11 @@ int link_process_rtnl(Link *l, sd_netlink_message *m) {
         (void) sd_netlink_message_read_u32(m, IFLA_MTU, &l->mtu);
         (void) sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &l->operstate);
 
-        if (sd_netlink_message_read_string(m, IFLA_IFNAME, &n) >= 0) {
+        if (sd_netlink_message_read_string(m, IFLA_IFNAME, &n) >= 0 &&
+            !streq_ptr(l->ifname, n)) {
+                if (l->ifname)
+                        log_link_debug(l, "Interface name change detected: %s -> %s", l->ifname, n);
+
                 r = free_and_strdup(&l->ifname, n);
                 if (r < 0)
                         return r;