network: Show network and link file dropins in networkctl status

Fixes #24428

5 files changed, 72 insertions, 6 deletions

diff --git a/src/network/networkctl.c b/src/network/networkctl.c
index 357d38f5ea..65015b132f 100644
--- a/src/network/networkctl.c
+++ b/src/network/networkctl.c
@@ -1536,13 +1536,29 @@ static int table_add_string_line(Table *table, const char *key, const char *valu
         return 0;
 }
 
+static int format_dropins(char **dropins) {
+        STRV_FOREACH(d, dropins) {
+                _cleanup_free_ char *s = NULL;
+                int glyph = *(d + 1) == NULL ? SPECIAL_GLYPH_TREE_RIGHT : SPECIAL_GLYPH_TREE_BRANCH;
+
+                s = strjoin(special_glyph(glyph), *d);
+                if (!s)
+                        return log_oom();
+
+                free_and_replace(*d, s);
+        }
+
+        return 0;
+}
+
 static int link_status_one(
                 sd_bus *bus,
                 sd_netlink *rtnl,
                 sd_hwdb *hwdb,
                 const LinkInfo *info) {
 
-        _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **sip = NULL, **search_domains = NULL, **route_domains = NULL;
+        _cleanup_strv_free_ char **dns = NULL, **ntp = NULL, **sip = NULL, **search_domains = NULL,
+                **route_domains = NULL, **link_dropins = NULL, **network_dropins = NULL;
         _cleanup_free_ char *t = NULL, *network = NULL, *iaid = NULL, *duid = NULL,
                 *setup_state = NULL, *operational_state = NULL, *online_state = NULL, *activation_policy = NULL;
         const char *driver = NULL, *path = NULL, *vendor = NULL, *model = NULL, *link = NULL,
@@ -1571,12 +1587,22 @@ static int link_status_one(
         (void) sd_network_link_get_ntp(info->ifindex, &ntp);
         (void) sd_network_link_get_sip(info->ifindex, &sip);
         (void) sd_network_link_get_network_file(info->ifindex, &network);
+        (void) sd_network_link_get_network_file_dropins(info->ifindex, &network_dropins);
         (void) sd_network_link_get_carrier_bound_to(info->ifindex, &carrier_bound_to);
         (void) sd_network_link_get_carrier_bound_by(info->ifindex, &carrier_bound_by);
         (void) sd_network_link_get_activation_policy(info->ifindex, &activation_policy);
 
         if (info->sd_device) {
+                const char *joined;
+
                 (void) sd_device_get_property_value(info->sd_device, "ID_NET_LINK_FILE", &link);
+
+                if (sd_device_get_property_value(info->sd_device, "ID_NET_LINK_FILE_DROPINS", &joined) >= 0) {
+                        r = strv_split_full(&link_dropins, joined, ":", EXTRACT_CUNESCAPE);
+                        if (r < 0)
+                                return r;
+                }
+
                 (void) sd_device_get_property_value(info->sd_device, "ID_NET_DRIVER", &driver);
                 (void) sd_device_get_property_value(info->sd_device, "ID_PATH", &path);
 
@@ -1596,6 +1622,20 @@ static int link_status_one(
 
         (void) dhcp_lease_load(&lease, lease_file);
 
+        r = format_dropins(network_dropins);
+        if (r < 0)
+                return r;
+
+        if (strv_prepend(&network_dropins, network) < 0)
+                return log_oom();
+
+        r = format_dropins(link_dropins);
+        if (r < 0)
+                return r;
+
+        if (strv_prepend(&link_dropins, link) < 0)
+                return log_oom();
+
         table = table_new("dot", "key", "value");
         if (!table)
                 return log_oom();
@@ -1631,10 +1671,10 @@ static int link_status_one(
                            TABLE_EMPTY,
                            TABLE_STRING, "Link File:",
                            TABLE_SET_ALIGN_PERCENT, 100,
-                           TABLE_STRING, strna(link),
+                           TABLE_STRV, link_dropins ?: STRV_MAKE("n/a"),
                            TABLE_EMPTY,
                            TABLE_STRING, "Network File:",
-                           TABLE_STRING, strna(network),
+                           TABLE_STRV, network_dropins ?: STRV_MAKE("n/a"),
                            TABLE_EMPTY,
                            TABLE_STRING, "State:");
         if (r < 0)
diff --git a/src/network/networkd-json.c b/src/network/networkd-json.c
index 9e2ff33d97..c37f734d61 100644
--- a/src/network/networkd-json.c
+++ b/src/network/networkd-json.c
@@ -464,6 +464,7 @@ static int network_build_json(Network *network, JsonVariant **ret) {
 
         return json_build(ret, JSON_BUILD_OBJECT(
                                 JSON_BUILD_PAIR_STRING("NetworkFile", network->filename),
+                                JSON_BUILD_PAIR_STRV("NetworkFileDropins", network->dropins),
                                 JSON_BUILD_PAIR_BOOLEAN("RequiredForOnline", network->required_for_online),
                                 JSON_BUILD_PAIR("RequiredOperationalStateForOnline",
                                                 JSON_BUILD_ARRAY(JSON_BUILD_STRING(link_operstate_to_string(network->required_operstate_for_online.min)),
@@ -475,7 +476,9 @@ static int network_build_json(Network *network, JsonVariant **ret) {
 }
 
 static int device_build_json(sd_device *device, JsonVariant **ret) {
-        const char *link = NULL, *path = NULL, *vendor = NULL, *model = NULL;
+        _cleanup_strv_free_ char **link_dropins = NULL;
+        const char *link = NULL, *path = NULL, *vendor = NULL, *model = NULL, *joined;
+        int r;
 
         assert(ret);
 
@@ -485,6 +488,13 @@ static int device_build_json(sd_device *device, JsonVariant **ret) {
         }
 
         (void) sd_device_get_property_value(device, "ID_NET_LINK_FILE", &link);
+
+        if (sd_device_get_property_value(device, "ID_NET_LINK_FILE_DROPINS", &joined) >= 0) {
+                 r = strv_split_full(&link_dropins, joined, ":", EXTRACT_CUNESCAPE);
+                 if (r < 0)
+                        return r;
+        }
+
         (void) sd_device_get_property_value(device, "ID_PATH", &path);
 
         if (sd_device_get_property_value(device, "ID_VENDOR_FROM_DATABASE", &vendor) < 0)
@@ -495,6 +505,7 @@ static int device_build_json(sd_device *device, JsonVariant **ret) {
 
         return json_build(ret, JSON_BUILD_OBJECT(
                                 JSON_BUILD_PAIR_STRING_NON_EMPTY("LinkFile", link),
+                                JSON_BUILD_PAIR_STRV_NON_EMPTY("LinkFileDropins", link_dropins),
                                 JSON_BUILD_PAIR_STRING_NON_EMPTY("Path", path),
                                 JSON_BUILD_PAIR_STRING_NON_EMPTY("Vendor", vendor),
                                 JSON_BUILD_PAIR_STRING_NON_EMPTY("Model", model)));
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index d516918c78..d881889316 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -552,7 +552,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                         CONFIG_PARSE_WARN,
                         network,
                         &network->stats_by_path,
-                        NULL);
+                        &network->dropins);
         if (r < 0)
                 return r; /* config_parse_many() logs internally. */
 
@@ -670,6 +670,7 @@ static Network *network_free(Network *network) {
         free(network->name);
         free(network->filename);
         free(network->description);
+        strv_free(network->dropins);
         hashmap_free(network->stats_by_path);
 
         /* conditions */
diff --git a/src/network/networkd-network.h b/src/network/networkd-network.h
index 09f0e9beea..fbeec6072e 100644
--- a/src/network/networkd-network.h
+++ b/src/network/networkd-network.h
@@ -65,6 +65,7 @@ struct Network {
 
         char *name;
         char *filename;
+        char **dropins;
         Hashmap *stats_by_path;
         char *description;
 
diff --git a/src/network/networkd-state-file.c b/src/network/networkd-state-file.c
index 0800e91202..6e962c03f6 100644
--- a/src/network/networkd-state-file.c
+++ b/src/network/networkd-state-file.c
@@ -5,6 +5,7 @@
 
 #include "alloc-util.h"
 #include "dns-domain.h"
+#include "escape.h"
 #include "fd-util.h"
 #include "fileio.h"
 #include "fs-util.h"
@@ -515,7 +516,7 @@ int link_save(Link *link) {
 
         if (link->network) {
                 const char *online_state;
-                bool space;
+                bool space = false;
 
                 online_state = link_online_state_to_string(link->online_state);
                 if (online_state)
@@ -538,6 +539,18 @@ int link_save(Link *link) {
 
                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
 
+                fputs("NETWORK_FILE_DROPINS=\"", f);
+                STRV_FOREACH(d, link->network->dropins) {
+                        _cleanup_free_ char *escaped = NULL;
+
+                        escaped = xescape(*d, ":");
+                        if (!escaped)
+                                return -ENOMEM;
+
+                        fputs_with_space(f, escaped, ":", &space);
+                }
+                fputs("\"\n", f);
+
                 /************************************************************/
 
                 fputs("DNS=", f);