backend/session: Remove logind backend

This is instead delegated to libseat.

12 files changed, 9 insertions, 809 deletions

diff --git a/.builds/alpine.yml b/.builds/alpine.yml
index 370b504c..3caed345 100644
--- a/.builds/alpine.yml
+++ b/.builds/alpine.yml
@@ -19,7 +19,7 @@ sources:
 tasks:
   - setup: |
       cd wlroots
-      meson build -Dauto_features=enabled -Dlogind=disabled -Dlibseat=disabled -Dxcb-errors=disabled
+      meson build -Dauto_features=enabled -Dlibseat=disabled -Dxcb-errors=disabled
   - build: |
       cd wlroots
       ninja -C build
diff --git a/.builds/archlinux.yml b/.builds/archlinux.yml
index 27601d21..12b84787 100644
--- a/.builds/archlinux.yml
+++ b/.builds/archlinux.yml
@@ -20,8 +20,8 @@ sources:
 tasks:
   - setup: |
       cd wlroots
-      CC=gcc meson build-gcc -Dauto_features=enabled -Dlogind-provider=systemd --prefix /usr
-      CC=clang meson build-clang -Dauto_features=enabled -Dlogind-provider=systemd
+      CC=gcc meson build-gcc -Dauto_features=enabled --prefix /usr
+      CC=clang meson build-clang -Dauto_features=enabled
   - gcc: |
       cd wlroots/build-gcc
       ninja
diff --git a/.builds/freebsd.yml b/.builds/freebsd.yml
index f42e895a..7806b72c 100644
--- a/.builds/freebsd.yml
+++ b/.builds/freebsd.yml
@@ -28,7 +28,7 @@ sources:
 tasks:
   - wlroots: |
       cd wlroots
-      meson build -Dauto_features=enabled -Dlogind=disabled
+      meson build -Dauto_features=enabled
       ninja -C build
       sudo ninja -C build install
   - tinywl: |
diff --git a/README.md b/README.md
index 0e2a2851..83d818c6 100644
--- a/README.md
+++ b/README.md
@@ -50,9 +50,7 @@ Install dependencies:
 * xkbcommon
 * udev
 * pixman
-* libseat (optional, for seatd support)
-* systemd (optional, for logind support)
-* elogind (optional, for logind support on systems without systemd)
+* libseat (optional, for (e)logind and seatd support)
 * libuuid (optional, for xdg-foreign support)
 
 If you choose to enable X11 support:
diff --git a/backend/session/logind.c b/backend/session/logind.c
deleted file mode 100644
index 0cef1356..00000000
--- a/backend/session/logind.c
+++ /dev/null
@@ -1,728 +0,0 @@
-#define _POSIX_C_SOURCE 200809L
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/sysmacros.h>
-#include <unistd.h>
-#include <wayland-server-core.h>
-#include <wlr/backend/session/interface.h>
-#include <wlr/config.h>
-#include <wlr/util/log.h>
-#include "backend/session/session.h"
-#include "util/signal.h"
-
-#if WLR_HAS_SYSTEMD
-	#include <systemd/sd-bus.h>
-	#include <systemd/sd-login.h>
-#elif WLR_HAS_ELOGIND
-	#include <elogind/sd-bus.h>
-	#include <elogind/sd-login.h>
-#endif
-
-enum { DRM_MAJOR = 226 };
-
-const struct session_impl session_logind;
-
-struct logind_session {
-	struct wlr_session base;
-
-	sd_bus *bus;
-	struct wl_event_source *event;
-
-	char *id;
-	char *path;
-
-	// specifies whether a drm device was taken
-	// if so, the session will be (de)activated with the drm fd,
-	// otherwise with the dbus PropertiesChanged on "active" signal
-	bool has_drm;
-};
-
-static struct logind_session *logind_session_from_session(
-		struct wlr_session *base) {
-	assert(base->impl == &session_logind);
-	return (struct logind_session *)base;
-}
-
-static int logind_take_device(struct wlr_session *base, const char *path) {
-	struct logind_session *session = logind_session_from_session(base);
-
-	int fd = -1;
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	struct stat st;
-	if (stat(path, &st) < 0) {
-		wlr_log(WLR_ERROR, "Failed to stat '%s'", path);
-		return -1;
-	}
-
-	if (major(st.st_rdev) == DRM_MAJOR) {
-		session->has_drm = true;
-	}
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "TakeDevice",
-		&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to take device '%s': %s", path,
-			error.message);
-		goto out;
-	}
-
-	int paused = 0;
-	ret = sd_bus_message_read(msg, "hb", &fd, &paused);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to parse D-Bus response for '%s': %s",
-			path, strerror(-ret));
-		goto out;
-	}
-
-	// The original fd seems to be closed when the message is freed
-	// so we just clone it.
-	fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
-	if (fd < 0) {
-		wlr_log(WLR_ERROR, "Failed to clone file descriptor for '%s': %s",
-			path, strerror(errno));
-		goto out;
-	}
-
-out:
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-	return fd;
-}
-
-static void logind_release_device(struct wlr_session *base, int fd) {
-	struct logind_session *session = logind_session_from_session(base);
-
-	struct stat st;
-	if (fstat(fd, &st) < 0) {
-		wlr_log(WLR_ERROR, "Failed to stat device '%d': %s", fd,
-			strerror(errno));
-		close(fd);
-		return;
-	}
-	close(fd);
-
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-	int ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "ReleaseDevice",
-		&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to release device '%d': %s", fd,
-			error.message);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-}
-
-static bool logind_change_vt(struct wlr_session *base, unsigned vt) {
-	struct logind_session *session = logind_session_from_session(base);
-
-	// Only if seat has VTs associated with it
-	if (!sd_seat_can_tty(session->base.seat)) {
-		return true;
-	}
-
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		"/org/freedesktop/login1/seat/seat0", "org.freedesktop.login1.Seat", "SwitchTo",
-		&error, &msg, "u", (uint32_t)vt);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to change to vt '%u'", vt);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-	return ret >= 0;
-}
-
-static bool find_session_path(struct logind_session *session) {
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-			"/org/freedesktop/login1", "org.freedesktop.login1.Manager",
-			"GetSession", &error, &msg, "s", session->id);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to get session path: %s", error.message);
-		goto out;
-	}
-
-	const char *path;
-	ret = sd_bus_message_read(msg, "o", &path);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Could not parse session path: %s", error.message);
-		goto out;
-	}
-	session->path = strdup(path);
-
-out:
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-
-	return ret >= 0;
-}
-
-static bool session_activate(struct logind_session *session) {
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "Activate",
-		&error, &msg, "");
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to activate session: %s", error.message);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-	return ret >= 0;
-}
-
-static bool take_control(struct logind_session *session) {
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "TakeControl",
-		&error, &msg, "b", false);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to take control of session: %s",
-			error.message);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-	return ret >= 0;
-}
-
-static void set_type(struct logind_session *session) {
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "SetType",
-		&error, &msg, "s", "wayland");
-	if (ret < 0) {
-		wlr_log(WLR_DEBUG, "Failed to set logind session type for session: %s",
-			error.message);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-
-	if (ret < 0) {
-		return;
-	}
-
-	ret = setenv("XDG_SESSION_TYPE", "wayland", 1);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to set XDG_SESSION_TYPE for session");
-	}
-}
-
-static void release_control(struct logind_session *session) {
-	int ret;
-	sd_bus_message *msg = NULL;
-	sd_bus_error error = SD_BUS_ERROR_NULL;
-
-	ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-		session->path, "org.freedesktop.login1.Session", "ReleaseControl",
-		&error, &msg, "");
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to release control of session: %s",
-			error.message);
-	}
-
-	sd_bus_error_free(&error);
-	sd_bus_message_unref(msg);
-}
-
-static void logind_session_destroy(struct wlr_session *base) {
-	struct logind_session *session = logind_session_from_session(base);
-
-	release_control(session);
-
-	wl_event_source_remove(session->event);
-	sd_bus_unref(session->bus);
-	free(session->id);
-	free(session->path);
-	free(session);
-}
-
-static int session_removed(sd_bus_message *msg, void *userdata,
-		sd_bus_error *ret_error) {
-	wlr_log(WLR_INFO, "SessionRemoved signal received");
-	return 0;
-}
-
-static struct wlr_device *find_device(struct wlr_session *session,
-		dev_t devnum) {
-	struct wlr_device *dev;
-
-	wl_list_for_each(dev, &session->devices, link) {
-		if (dev->dev == devnum) {
-			return dev;
-		}
-	}
-
-	wlr_log(WLR_ERROR, "Tried to use dev_t %lu not opened by session",
-		(unsigned long)devnum);
-	assert(0);
-	return NULL;
-}
-
-static int pause_device(sd_bus_message *msg, void *userdata,
-		sd_bus_error *ret_error) {
-	struct logind_session *session = userdata;
-	int ret;
-
-	uint32_t major, minor;
-	const char *type;
-	ret = sd_bus_message_read(msg, "uus", &major, &minor, &type);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to parse D-Bus response for PauseDevice: %s",
-			strerror(-ret));
-		goto error;
-	}
-
-	if (major == DRM_MAJOR && strcmp(type, "gone") != 0) {
-		assert(session->has_drm);
-		session->base.active = false;
-		wlr_signal_emit_safe(&session->base.events.active, NULL);
-	}
-
-	if (strcmp(type, "pause") == 0) {
-		ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
-			session->path, "org.freedesktop.login1.Session", "PauseDeviceComplete",
-			ret_error, &msg, "uu", major, minor);
-		if (ret < 0) {
-			wlr_log(WLR_ERROR, "Failed to send PauseDeviceComplete signal: %s",
-				strerror(-ret));
-		}
-	}
-
-error:
-	return 0;
-}
-
-static int resume_device(sd_bus_message *msg, void *userdata,
-		sd_bus_error *ret_error) {
-	struct logind_session *session = userdata;
-	int ret;
-
-	int fd;
-	uint32_t major, minor;
-	ret = sd_bus_message_read(msg, "uuh", &major, &minor, &fd);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to parse D-Bus response for ResumeDevice: %s",
-			strerror(-ret));
-		goto error;
-	}
-
-	if (major == DRM_MAJOR) {
-		struct wlr_device *dev = find_device(&session->base, makedev(major, minor));
-
-		close(dev->fd);
-		if (fcntl(fd, F_DUPFD_CLOEXEC, dev->fd) < 0) {
-			wlr_log_errno(WLR_ERROR, "Failed to duplicate file descriptor");
-			goto error;
-		}
-
-		if (!session->base.active) {
-			session->base.active = true;
-			wlr_signal_emit_safe(&session->base.events.active, NULL);
-		}
-	}
-
-error:
-	return 0;
-}
-
-static int session_properties_changed(sd_bus_message *msg, void *userdata,
-		sd_bus_error *ret_error) {
-	struct logind_session *session = userdata;
-	int ret = 0;
-
-	// if we have a drm fd we don't depend on this
-	if (session->has_drm) {
-		return 0;
-	}
-
-	// PropertiesChanged arg 1: interface
-	const char *interface;
-	ret = sd_bus_message_read_basic(msg, 's', &interface); // skip path
-	if (ret < 0) {
-		goto error;
-	}
-
-	if (strcmp(interface, "org.freedesktop.login1.Session") != 0) {
-		// not interesting for us; ignore
-		wlr_log(WLR_DEBUG, "ignoring PropertiesChanged from %s", interface);
-		return 0;
-	}
-
-	// PropertiesChanged arg 2: changed properties with values
-	ret = sd_bus_message_enter_container(msg, 'a', "{sv}");
-	if (ret < 0) {
-		goto error;
-	}
-
-	const char *s;
-	while ((ret = sd_bus_message_enter_container(msg, 'e', "sv")) > 0) {
-		ret = sd_bus_message_read_basic(msg, 's', &s);
-		if (ret < 0) {
-			goto error;
-		}
-
-		if (strcmp(s, "Active") == 0) {
-			int ret;
-			ret = sd_bus_message_enter_container(msg, 'v', "b");
-			if (ret < 0) {
-				goto error;
-			}
-
-			bool active;
-			ret = sd_bus_message_read_basic(msg, 'b', &active);
-			if (ret < 0) {
-				goto error;
-			}
-
-			if (session->base.active != active) {
-				session->base.active = active;
-				wlr_signal_emit_safe(&session->base.events.active, NULL);
-			}
-			return 0;
-		} else {
-			sd_bus_message_skip(msg, "{sv}");
-		}
-
-		ret = sd_bus_message_exit_container(msg);
-		if (ret < 0) {
-			goto error;
-		}
-	}
-
-	if (ret < 0) {
-		goto error;
-	}
-
-	ret = sd_bus_message_exit_container(msg);
-	if (ret < 0) {
-		goto error;
-	}
-
-	// PropertiesChanged arg 3: changed properties without values
-	sd_bus_message_enter_container(msg, 'a', "s");
-	while ((ret = sd_bus_message_read_basic(msg, 's', &s)) > 0) {
-		if (strcmp(s, "Active") == 0) {
-			sd_bus_error error = SD_BUS_ERROR_NULL;
-			bool active;
-			ret = sd_bus_get_property_trivial(session->bus,
-				"org.freedesktop.login1", session->path,
-				"org.freedesktop.login1.Session", "Active", &error,
-				'b', &active);
-			if (ret < 0) {
-				wlr_log(WLR_ERROR, "Failed to get 'Active' property: %s",
-					error.message);
-				return 0;
-			}
-
-			if (session->base.active != active) {
-				session->base.active = active;
-				wlr_signal_emit_safe(&session->base.events.active, NULL);
-			}
-			return 0;
-		}
-	}
-
-	if (ret < 0) {
-		goto error;
-	}
-
-	return 0;
-
-error:
-	wlr_log(WLR_ERROR, "Failed to parse D-Bus PropertiesChanged: %s",
-		strerror(-ret));
-	return 0;
-}
-
-static bool add_signal_matches(struct logind_session *session) {
-	static const char *logind = "org.freedesktop.login1";
-	static const char *logind_path = "/org/freedesktop/login1";
-	static const char *manager_interface = "org.freedesktop.login1.Manager";
-	static const char *session_interface = "org.freedesktop.login1.Session";
-	static const char *property_interface = "org.freedesktop.DBus.Properties";
-	int ret;
-
-	ret = sd_bus_match_signal(session->bus, NULL, logind, logind_path,
-		manager_interface, "SessionRemoved", session_removed, session);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
-		return false;
-	}
-
-	ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
-		session_interface, "PauseDevice", pause_device, session);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
-		return false;
-	}
-
-	ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
-		session_interface, "ResumeDevice", resume_device, session);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
-		return false;
-	}
-
-	ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
-		property_interface, "PropertiesChanged",
-		session_properties_changed, session);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
-		return false;
-	}
-
-	return true;
-}
-
-static int dbus_event(int fd, uint32_t mask, void *data) {
-	sd_bus *bus = data;
-	while (sd_bus_process(bus, NULL) > 0) {
-		// Do nothing.
-	}
-	return 1;
-}
-
-static bool contains_str(const char *needle, const char **haystack) {
-	for (int i = 0; haystack[i]; i++) {
-		if (strcmp(haystack[i], needle) == 0) {
-			return true;
-		}
-	}
-
-	return false;
-}
-
-static bool get_greeter_session(char **session_id) {
-	char *class = NULL;
-	char **user_sessions = NULL;
-	int user_session_count = sd_uid_get_sessions(getuid(), 1, &user_sessions);
-
-	if (user_session_count < 0) {
-		wlr_log(WLR_ERROR, "Failed to get sessions");
-		goto out;
-	}
-
-	if (user_session_count == 0) {
-		wlr_log(WLR_ERROR, "User has no sessions");
-		goto out;
-	}
-
-	for (int i = 0; i < user_session_count; ++i) {
-		int ret = sd_session_get_class(user_sessions[i], &class);
-		if (ret < 0) {
-			continue;
-		}
-
-		if (strcmp(class, "greeter") == 0) {
-			*session_id = strdup(user_sessions[i]);
-			goto out;
-		}
-	}
-
-out:
-	free(class);
-	for (int i = 0; i < user_session_count; ++i) {
-		free(user_sessions[i]);
-	}
-	free(user_sessions);
-
-	return *session_id != NULL;
-}
-
-static bool get_display_session(char **session_id) {
-	assert(session_id != NULL);
-	int ret;
-
-	char *type = NULL;
-	char *state = NULL;
-	char *xdg_session_id = getenv("XDG_SESSION_ID");
-
-	if (xdg_session_id) {
-		wlr_log(WLR_INFO, "Selecting session from XDG_SESSION_ID: %s", xdg_session_id);
-
-		// This just checks whether the supplied session ID is valid
-		if (sd_session_is_active(xdg_session_id) < 0) {
-			wlr_log(WLR_ERROR, "Invalid XDG_SESSION_ID: '%s'", xdg_session_id);
-			goto error;
-		}
-		*session_id = strdup(xdg_session_id);
-		return true;
-	}
-
-	// If there's a session active for the current process then just use that
-	ret = sd_pid_get_session(getpid(), session_id);
-	if (ret == 0) {
-		return true;
-	}
-
-	// Find any active sessions for the user if the process isn't part of an
-	// active session itself
-	ret = sd_uid_get_display(getuid(), session_id);
-	if (ret < 0 && ret != -ENODATA) {
-		wlr_log(WLR_ERROR, "Failed to get display: %s", strerror(-ret));
-		goto error;
-	}
-
-	if (ret != 0 && !get_greeter_session(session_id)) {
-		wlr_log(WLR_ERROR, "Couldn't find an active session or a greeter session");
-		goto error;
-	}
-
-	assert(*session_id != NULL);
-
-	// Check that the available session is graphical
-	ret = sd_session_get_type(*session_id, &type);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Couldn't get a type for session '%s': %s",
-				*session_id, strerror(-ret));
-		goto error;
-	}
-
-	const char *graphical_session_types[] = {"wayland", "x11", "mir", NULL};
-	if (!contains_str(type, graphical_session_types)) {
-		wlr_log(WLR_ERROR, "Session '%s' isn't a graphical session (type: '%s')",
-				*session_id, type);
-		goto error;
-	}
-
-	// Check that the session is active
-	ret = sd_session_get_state(*session_id, &state);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Couldn't get state for session '%s': %s",
-				*session_id, strerror(-ret));
-		goto error;
-	}
-
-	const char *active_states[] = {"active", "online", NULL};
-	if (!contains_str(state, active_states)) {
-		wlr_log(WLR_ERROR, "Session '%s' is not active", *session_id);
-		goto error;
-	}
-
-	free(type);
-	free(state);
-	return true;
-
-error:
-	free(type);
-	free(state);
-	free(*session_id);
-	*session_id = NULL;
-
-	return false;
-}
-
-static struct wlr_session *logind_session_create(struct wl_display *disp) {
-	int ret;
-	struct logind_session *session = calloc(1, sizeof(*session));
-	if (!session) {
-		wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno));
-		return NULL;
-	}
-
-	session_init(&session->base);
-
-	if (!get_display_session(&session->id)) {
-		goto error;
-	}
-
-	char *seat;
-	ret = sd_session_get_seat(session->id, &seat);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to get seat id: %s", strerror(-ret));
-		goto error;
-	}
-	snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
-
-	if (sd_seat_can_tty(seat)) {
-		ret = sd_session_get_vt(session->id, &session->base.vtnr);
-		if (ret < 0) {
-			wlr_log(WLR_ERROR, "Session not running in virtual terminal");
-			goto error;
-		}
-	}
-	free(seat);
-
-	ret = sd_bus_default_system(&session->bus);
-	if (ret < 0) {
-		wlr_log(WLR_ERROR, "Failed to open D-Bus connection: %s", strerror(-ret));
-		goto error;
-	}
-
-	if (!find_session_path(session)) {
-		sd_bus_unref(session->bus);
-		goto error;
-	}
-
-	if (!add_signal_matches(session)) {
-		goto error_bus;
-	}
-
-	struct wl_event_loop *event_loop = wl_display_get_event_loop(disp);
-	session->event = wl_event_loop_add_fd(event_loop, sd_bus_get_fd(session->bus),
-		WL_EVENT_READABLE, dbus_event, session->bus);
-
-	if (!session_activate(session)) {
-		goto error_bus;
-	}
-
-	if (!take_control(session)) {
-		goto error_bus;
-	}
-
-	set_type(session);
-
-	wlr_log(WLR_INFO, "Successfully loaded logind session");
-
-	session->base.impl = &session_logind;
-	session->base.active = true;
-
-	return &session->base;
-
-error_bus:
-	sd_bus_unref(session->bus);
-	free(session->path);
-
-error:
-	free(session->id);
-	return NULL;
-}
-
-const struct session_impl session_logind = {
-	.create = logind_session_create,
-	.destroy = logind_session_destroy,
-	.open = logind_take_device,
-	.close = logind_release_device,
-	.change_vt = logind_change_vt,
-};
diff --git a/backend/session/meson.build b/backend/session/meson.build
index e25d0792..016d0fbb 100644
--- a/backend/session/meson.build
+++ b/backend/session/meson.build
@@ -10,59 +10,6 @@ else
 	wlr_files += files('direct.c')
 endif
 
-# logind
-
-msg = []
-if get_option('logind').enabled()
-	msg += 'Install "lib@0@" or pass "-Dlogind=disabled".'
-endif
-if not get_option('logind').disabled()
-	msg += 'Required for logind support.'
-	msg += 'You may need to pass "-Dlogind-provider=elogind" or "-Dlogind-provider=systemd" to ensure the correct library is detected.'
-endif
-
-logind_version = '>=237'
-logind_found = false
-
-if get_option('logind-provider') == 'auto'
-	if not get_option('logind').disabled()
-		assert(get_option('auto_features').auto(), '-Dlogind-provider must be set to systemd or elogind since auto_features != auto')
-		logind = dependency('libsystemd',
-			required: get_option('logind'),
-			not_found_message: 'libsystemd not found, trying libelogind\n' + '\n'.join(msg),
-			version: logind_version,
-		)
-		if logind.found()
-			features += { 'systemd': true }
-		else
-			logind = dependency('libelogind',
-				required: get_option('logind'),
-				not_found_message: 'libelogind not found\n' + '\n'.join(msg),
-				version: logind_version,
-			)
-			if logind.found()
-				features += { 'elogind': true }
-			endif
-		endif
-		logind_found = logind.found()
-	endif
-else
-	logind = dependency('lib' + get_option('logind-provider'),
-		required: get_option('logind'),
-		not_found_message: '\n'.join(msg).format(get_option('logind-provider')),
-		version: logind_version,
-	)
-	if logind.found()
-		features += { get_option('logind-provider'): true }
-		logind_found = true
-	endif
-endif
-
-if logind_found
-	wlr_files += files('logind.c')
-	wlr_deps += logind
-endif
-
 # libseat
 
 libseat = dependency('libseat',
diff --git a/backend/session/session.c b/backend/session/session.c
index cfb69ac2..ed332c7c 100644
--- a/backend/session/session.c
+++ b/backend/session/session.c
@@ -21,7 +21,6 @@
 #define WAIT_GPU_TIMEOUT 10000 // ms
 
 extern const struct session_impl session_libseat;
-extern const struct session_impl session_logind;
 extern const struct session_impl session_direct;
 extern const struct session_impl session_noop;
 
@@ -29,9 +28,6 @@ static const struct session_impl *const impls[] = {
 #if WLR_HAS_LIBSEAT
 	&session_libseat,
 #endif
-#if WLR_HAS_SYSTEMD || WLR_HAS_ELOGIND
-	&session_logind,
-#endif
 	&session_direct,
 	NULL,
 };
@@ -121,13 +117,6 @@ struct wlr_session *wlr_session_create(struct wl_display *disp) {
 #else
 			wlr_log(WLR_ERROR, "wlroots is not compiled with libseat support");
 #endif
-		} else if (strcmp(env_wlr_session, "logind") == 0 ||
-				strcmp(env_wlr_session, "systemd") == 0) {
-#if WLR_HAS_SYSTEMD || WLR_HAS_ELOGIND
-			session = session_logind.create(disp);
-#else
-			wlr_log(WLR_ERROR, "wlroots is not compiled with logind support");
-#endif
 		} else if (strcmp(env_wlr_session, "direct") == 0) {
 			session = session_direct.create(disp);
 		} else if (strcmp(env_wlr_session, "noop") == 0) {
diff --git a/docs/env_vars.md b/docs/env_vars.md
index 3c782d80..0a6fd896 100644
--- a/docs/env_vars.md
+++ b/docs/env_vars.md
@@ -7,7 +7,7 @@ wlroots reads these environment variables
 * *WLR_NO_HARDWARE_CURSORS*: set to 1 to use software cursors instead of
   hardware cursors
 * *WLR_SESSION*: specifies the `wlr_session` to be used (available sessions:
-  logind/systemd, libseat, direct)
+  libseat, direct)
 * *WLR_DIRECT_TTY*: specifies the tty to be used (instead of using /dev/tty)
 * *WLR_XWAYLAND*: specifies the path to an Xwayland binary to be used (instead
   of following shell search semantics for "Xwayland")
diff --git a/include/wlr/backend/session.h b/include/wlr/backend/session.h
index 7c0d3b22..6fee0421 100644
--- a/include/wlr/backend/session.h
+++ b/include/wlr/backend/session.h
@@ -58,8 +58,9 @@ struct wlr_session_add_event {
  * This should not be called if another program is already in control
  * of the terminal (Xorg, another Wayland compositor, etc.).
  *
- * If logind support is not enabled, you must have CAP_SYS_ADMIN or be root.
- * It is safe to drop privileges after this is called.
+ * If libseat support is not enabled, or if a standalone backend is to be used,
+ * then you must have CAP_SYS_ADMIN or be root. It is safe to drop privileges
+ * after this is called.
  *
  * Returns NULL on error.
  */
diff --git a/include/wlr/config.h.in b/include/wlr/config.h.in
index 64abec28..15aacbfe 100644
--- a/include/wlr/config.h.in
+++ b/include/wlr/config.h.in
@@ -1,9 +1,6 @@
 #ifndef WLR_CONFIG_H
 #define WLR_CONFIG_H
 
-#mesondefine WLR_HAS_SYSTEMD
-#mesondefine WLR_HAS_ELOGIND
-
 #mesondefine WLR_HAS_LIBSEAT
 
 #mesondefine WLR_HAS_X11_BACKEND
diff --git a/meson.build b/meson.build
index 2a4f0a76..afa9c86a 100644
--- a/meson.build
+++ b/meson.build
@@ -81,8 +81,6 @@ else
 endif
 
 features = {
-	'systemd': false,
-	'elogind': false,
 	'libseat': false,
 	'x11-backend': false,
 	'xwayland': false,
diff --git a/meson_options.txt b/meson_options.txt
index d12861f4..770f604d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,5 +1,3 @@
-option('logind', type: 'feature', value: 'auto', description: 'Enable support for rootless session via logind')
-option('logind-provider', type: 'combo', choices: ['auto', 'systemd', 'elogind'], value: 'auto', description: 'Provider of logind support library')
 option('libseat', type: 'feature', value: 'auto', description: 'Enable support for rootless session via libseat')
 option('xcb-errors', type: 'feature', value: 'auto', description: 'Use xcb-errors util library')
 option('xwayland', type: 'feature', value: 'auto', yield: true, description: 'Enable support for X11 applications')