systemctl: refactor code to watch unit ActiveState a bit

let's split out one function, to make this reusable

diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 23818a0db12918aa1c3aff37b367fe5a0e616530..7814d8313c957eb6863318ad8acb0e7993fc6848 100644 (file)
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -2893,6 +2893,56 @@ static int on_properties_changed(sd_bus_message *m, void *userdata, sd_bus_error
         return 0;
 }
 
+static int wait_context_watch(
+                WaitContext *wait_context,
+                sd_bus *bus,
+                const char *name) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_free_ char *unit_path = NULL;
+        int r;
+
+        assert(wait_context);
+        assert(name);
+
+        log_debug("Watching for property changes of %s", name);
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.systemd1",
+                        "/org/freedesktop/systemd1",
+                        "org.freedesktop.systemd1.Manager",
+                        "RefUnit",
+                        &error,
+                        NULL,
+                        "s", name);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add reference to unit %s: %s", name, bus_error_message(&error, r));
+
+        unit_path = unit_dbus_path_from_name(name);
+        if (!unit_path)
+                return log_oom();
+
+        r = set_ensure_allocated(&wait_context->unit_paths, &string_hash_ops);
+        if (r < 0)
+                return log_oom();
+
+        r = set_put_strdup(wait_context->unit_paths, unit_path);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add unit path %s to set: %m", unit_path);
+
+        r = sd_bus_match_signal_async(bus,
+                                      &wait_context->match,
+                                      NULL,
+                                      unit_path,
+                                      "org.freedesktop.DBus.Properties",
+                                      "PropertiesChanged",
+                                      on_properties_changed, NULL, wait_context);
+        if (r < 0)
+                return log_error_errno(r, "Failed to request match for PropertiesChanged signal: %m");
+
+        return 0;
+}
+
 static int start_unit_one(
                 sd_bus *bus,
                 const char *method,
@@ -2912,38 +2962,9 @@ static int start_unit_one(
         assert(error);
 
         if (wait_context) {
-                _cleanup_free_ char *unit_path = NULL;
-
-                log_debug("Watching for property changes of %s", name);
-                r = sd_bus_call_method(
-                                bus,
-                                "org.freedesktop.systemd1",
-                                "/org/freedesktop/systemd1",
-                                "org.freedesktop.systemd1.Manager",
-                                "RefUnit",
-                                error,
-                                NULL,
-                                "s", name);
-                if (r < 0)
-                        return log_error_errno(r, "Failed to RefUnit %s: %s", name, bus_error_message(error, r));
-
-                unit_path = unit_dbus_path_from_name(name);
-                if (!unit_path)
-                        return log_oom();
-
-                r = set_put_strdup(wait_context->unit_paths, unit_path);
-                if (r < 0)
-                        return log_error_errno(r, "Failed to add unit path %s to set: %m", unit_path);
-
-                r = sd_bus_match_signal_async(bus,
-                                              &wait_context->match,
-                                              NULL,
-                                              unit_path,
-                                              "org.freedesktop.DBus.Properties",
-                                              "PropertiesChanged",
-                                              on_properties_changed, NULL, wait_context);
+                r = wait_context_watch(wait_context, bus, name);
                 if (r < 0)
-                        return log_error_errno(r, "Failed to request match for PropertiesChanged signal: %m");
+                        return r;
         }
 
         log_debug("%s dbus call org.freedesktop.systemd1.Manager %s(%s, %s)",
@@ -3164,10 +3185,6 @@ static int start_unit(int argc, char *argv[], void *userdata) {
         }
 
         if (arg_wait) {
-                wait_context.unit_paths = set_new(&string_hash_ops);
-                if (!wait_context.unit_paths)
-                        return log_oom();
-
                 r = sd_bus_call_method_async(
                                 bus,
                                 NULL,