qga/commands-posix: Log all net stats failures

guest_get_network_stats can silently fail in a couple of ways. Add
debug messages to these cases, so we're never completely silent on
failure.

Signed-off-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220426195526.7699-5-adeason@sinenomine.net>

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index c1e994f3e6ab675909d16b6aa4664ecf31b27596..ee997a58f21c17ef7f42b246562799b17d0455e8 100644 (file)
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2775,6 +2775,8 @@ static int guest_get_network_stats(const char *name,
     size_t n = 0;
     fp = fopen(devinfo, "r");
     if (!fp) {
+        g_debug("failed to open network stats %s: %s", devinfo,
+                g_strerror(errno));
         return -1;
     }
     name_len = strlen(name);
@@ -2823,7 +2825,9 @@ static int guest_get_network_stats(const char *name,
     fclose(fp);
     g_free(line);
     g_debug("/proc/net/dev: Interface '%s' not found", name);
-#endif /* CONFIG_LINUX */
+#else /* !CONFIG_LINUX */
+    g_debug("Network stats reporting available only for Linux");
+#endif /* !CONFIG_LINUX */
     return -1;
 }