From d21f2147e16b6ff7ef39bcd1daf5e2c4a30c2ad8 Mon Sep 17 00:00:00 2001
From: Roosembert Palacios <roosemberth@posteo.ch>
Date: Mon, 16 May 2022 16:20:41 +0200
Subject: [PATCH] sway/lock: set session lock hints if systemd is available

Signed-off-by: Roosembert Palacios <roosemberth@posteo.ch>
---
 sway/lock.c      | 32 ++++++++++++++++++++++++++++++++
 sway/meson.build |  4 ++++
 2 files changed, 36 insertions(+)

diff --git a/sway/lock.c b/sway/lock.c
index 04f80079e..de6fea598 100644
--- a/sway/lock.c
+++ b/sway/lock.c
@@ -6,6 +6,11 @@
 #include "sway/output.h"
 #include "sway/server.h"
 
+#include "../include/config.h"
+#if HAVE_LIBSYSTEMD
+#include <systemd/sd-bus.h>
+#endif
+
 struct sway_session_lock_surface {
 	struct wlr_session_lock_surface_v1 *lock_surface;
 	struct sway_output *output;
@@ -84,6 +89,30 @@ static void handle_new_surface(struct wl_listener *listener, void *data) {
 	wl_signal_add(&output->wlr_output->events.commit, &surf->output_commit);
 }
 
+static void set_session_lock_hint(int is_locked) {
+#if HAVE_LIBSYSTEMD
+	sd_bus *bus = NULL;
+	sd_bus_error err = SD_BUS_ERROR_NULL;
+	int ret = sd_bus_default_system(&bus);
+	if (ret < 0) {
+		sway_log(SWAY_DEBUG, "Failed to set lock hint: Could not get bus: (%d)", ret);
+		return;
+	}
+	ret = sd_bus_call_method(bus,
+			"org.freedesktop.login1",
+			"/org/freedesktop/login1/session/self",
+			"org.freedesktop.login1.Session",
+			"SetLockedHint",
+			&err, NULL, "b", is_locked);
+	if (ret < 0) {
+		sway_log(SWAY_DEBUG, "Failed to set lock hint: Method call failed: %s: %s",
+			err.name, err.message);
+	}
+	sd_bus_error_free(&err);
+	sd_bus_unref(bus);
+#endif
+}
+
 static void handle_unlock(struct wl_listener *listener, void *data) {
 	sway_log(SWAY_DEBUG, "session unlocked");
 	server.session_lock.locked = false;
@@ -110,6 +139,7 @@ static void handle_unlock(struct wl_listener *listener, void *data) {
 		struct sway_output *output = root->outputs->items[i];
 		output_damage_whole(output);
 	}
+	set_session_lock_hint(false);
 }
 
 static void handle_abandon(struct wl_listener *listener, void *data) {
@@ -130,6 +160,7 @@ static void handle_abandon(struct wl_listener *listener, void *data) {
 		struct sway_output *output = root->outputs->items[i];
 		output_damage_whole(output);
 	}
+	set_session_lock_hint(false);
 }
 
 static void handle_session_lock(struct wl_listener *listener, void *data) {
@@ -161,6 +192,7 @@ static void handle_session_lock(struct wl_listener *listener, void *data) {
 		struct sway_output *output = root->outputs->items[i];
 		output_damage_whole(output);
 	}
+	set_session_lock_hint(true);
 }
 
 static void handle_session_lock_destroy(struct wl_listener *listener, void *data) {
diff --git a/sway/meson.build b/sway/meson.build
index 0ad783e3f..14202b1cb 100644
--- a/sway/meson.build
+++ b/sway/meson.build
@@ -229,6 +229,10 @@ if have_xwayland
 	sway_deps += xcb
 endif
 
+if sdbus.found()
+	sway_deps += sdbus
+endif
+
 executable(
 	'sway',
 	sway_sources,