From: Michael Tremer <michael.tremer@ipfire.org>
Date: Mon, 27 Jan 2025 13:54:14 +0000 (+0000)
Subject: daemon: Let systemd tell us when it is shutting down
X-Git-Tag: 0.9.30~357
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c05071636b072b0d6f00f698a836e86689804f6;p=pakfire.git

daemon: Let systemd tell us when it is shutting down

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/pakfire/daemon.c b/src/pakfire/daemon.c
index a906fc74..00670640 100644
--- a/src/pakfire/daemon.c
+++ b/src/pakfire/daemon.c
@@ -898,6 +898,34 @@ ERROR:
 	return r;
 }
 
+static int pakfire_daemon_prepare_for_shutdown(
+		sd_bus_message* message, void* data, sd_bus_error* error) {
+	struct pakfire_daemon* daemon = data;
+    int shutdown;
+    int r;
+
+    // Read the boolean value from the signal message
+    r = sd_bus_message_read(message, "b", &shutdown);
+    if (r < 0) {
+		ERROR(daemon->ctx, "Failed to parse PrepareForShutdown signal: %s\n", strerror(-r));
+		return r;
+    }
+
+	// If shutdown is true, the system is going to shut down soon.
+	// If false, the shutdown has been canceled.
+	if (shutdown) {
+		DEBUG(daemon->ctx, "Expecting the system to shut down soon...\n");
+
+		// XXX TODO
+	} else {
+		DEBUG(daemon->ctx, "Shutdown has been canceled\n");
+
+		// XXX TODO
+	}
+
+    return 0;
+}
+
 static int pakfire_daemon_setup_bus(struct pakfire_daemon* daemon) {
 	int r;
 
@@ -908,6 +936,29 @@ static int pakfire_daemon_setup_bus(struct pakfire_daemon* daemon) {
 		return r;
 	}
 
+	// Attach the bus to the event loop
+	r = sd_bus_attach_event(daemon->bus, daemon->loop, SD_EVENT_PRIORITY_NORMAL);
+	if (r < 0) {
+		ERROR(daemon->ctx, "Could not attach the bus to the event loop: %s\n", strerror(-r));
+		return r;
+	}
+
+	// Add a signal match
+	r = sd_bus_match_signal(
+		daemon->bus,
+		NULL,
+
+		// Destination, Path & Interface
+		"org.freedesktop.login1",
+		"/org/freedesktop/login1",
+		"org.freedesktop.login1.Manager",
+
+		// Signal & Handler
+		"PrepareForShutdown",
+		pakfire_daemon_prepare_for_shutdown,
+		daemon
+	);
+
 	return 0;
 }