Add a "RequiredForOnline=" Link attribute for .network files (#7347)

RequiredForOnline= denotes a link/network that does/does not require being up
for systemd-networkd-wait-online to consider the system online; this makes it
possible to ignore devices without modifying parameters to wait-online.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/libsystemd/sd-network/sd-network.c b/src/libsystemd/sd-network/sd-network.c
index e0f38b62aa..f6460b9f7c 100644
--- a/src/libsystemd/sd-network/sd-network.c
+++ b/src/libsystemd/sd-network/sd-network.c
@@ -172,6 +172,21 @@ _public_ int sd_network_link_get_operational_state(int ifindex, char **state) {
         return network_link_get_string(ifindex, "OPER_STATE", state);
 }
 
+_public_ int sd_network_link_get_required_for_online(int ifindex) {
+        _cleanup_free_ char *s = NULL;
+        int r;
+
+        r = network_link_get_string(ifindex, "REQUIRED_FOR_ONLINE", &s);
+        if (r < 0) {
+                /* Handle -ENODATA as RequiredForOnline=yes, for compatibility */
+                if (r == -ENODATA)
+                        return true;
+                return r;
+        }
+
+        return parse_boolean(s);
+}
+
 _public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) {
         return network_link_get_string(ifindex, "LLMNR", llmnr);
 }