systemctl: let's tweak how we synthesize a cell for activating unit

Let's create a string cell for the unit if possible (since there can
only be one unit right now, and the JSON alternative output then
generates a string instead of an array for us), an empty cell if empty.

1 files changed, 15 insertions, 7 deletions

diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 673f29bcaa..07b0fdd2c5 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -1027,7 +1027,7 @@ static int output_sockets_list(struct socket_info *socket_infos, unsigned cs) {
 
         if (cs) {
                 for (s = socket_infos; s < socket_infos + cs; s++) {
-                        _cleanup_free_ char *j = NULL, *activates = NULL;
+                        _cleanup_free_ char *j = NULL;
                         const char *path;
 
                         if (s->machine) {
@@ -1038,17 +1038,25 @@ static int output_sockets_list(struct socket_info *socket_infos, unsigned cs) {
                         } else
                                 path = s->path;
 
-                        activates = strv_join(s->triggered, ", ");
-                        if (!activates)
-                                return log_oom();
-
                         r = table_add_many(table,
                                            TABLE_STRING, path,
                                            TABLE_STRING, s->type,
-                                           TABLE_STRING, s->id,
-                                           TABLE_STRING, activates);
+                                           TABLE_STRING, s->id);
                         if (r < 0)
                                 return table_log_add_error(r);
+
+                        if (strv_isempty(s->triggered))
+                                r = table_add_cell(table, NULL, TABLE_EMPTY, NULL);
+                        else if (strv_length(s->triggered) == 1)
+                                r = table_add_cell(table, NULL, TABLE_STRING, s->triggered[0]);
+                        else
+                                /* This should never happen, currently our socket units can only trigger a
+                                 * single unit. But let's handle this anyway, who knows what the future
+                                 * brings? */
+                                r = table_add_cell(table, NULL, TABLE_STRV, s->triggered);
+                        if (r < 0)
+                                return table_log_add_error(r);
+
                 }
 
                 on = ansi_highlight();