terminal: drop unfinished code

This drops the libsystemd-terminal and systemd-consoled code for various
reasons:

 * It's been sitting there unfinished for over a year now and won't get
   finished any time soon.

 * Since its initial creation, several parts need significant rework: The
   input handling should be replaced with the now commonly used libinput,
   the drm accessors should coordinate the handling of mode-object
   hotplugging (including split connectors) with other DRM users, and the
   internal library users should be converted to sd-device and friends.

 * There is still significant kernel work required before sd-console is
   really useful. This includes, but is not limited to, simpledrm and
   drmlog.

 * The authority daemon is needed before all this code can be used for
   real. And this will definitely take a lot more time to get done as
   no-one else is currently working on this, but me.

 * kdbus maintenance has taken up way more time than I thought and it has
   much higher priority. I don't see me spending much time on the
   terminal code in the near future.

If anyone intends to hack on this, please feel free to contact me. I'll
gladly help you out with any issues. Once kdbus and authorityd are
finished (whenever that will be..) I'll definitely pick this up again. But
until then, lets reduce compile times and maintenance efforts on this code
and drop it for now.

1 files changed, 0 insertions, 1554 deletions

diff --git a/src/libsystemd-terminal/sysview.c b/src/libsystemd-terminal/sysview.c
deleted file mode 100644
index 2e9b15859a..0000000000
--- a/src/libsystemd-terminal/sysview.c
+++ /dev/null
@@ -1,1554 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
-  This file is part of systemd.
-
-  Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <inttypes.h>
-#include <libudev.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include "sd-bus.h"
-#include "sd-event.h"
-#include "sd-login.h"
-#include "macro.h"
-#include "udev-util.h"
-#include "util.h"
-#include "bus-util.h"
-#include "sysview.h"
-#include "sysview-internal.h"
-
-static int context_raise_session_control(sysview_context *c, sysview_session *session, int error);
-
-/*
- * Devices
- */
-
-sysview_device *sysview_find_device(sysview_context *c, const char *name) {
-        assert_return(c, NULL);
-        assert_return(name, NULL);
-
-        return hashmap_get(c->device_map, name);
-}
-
-int sysview_device_new(sysview_device **out, sysview_seat *seat, const char *name) {
-        _cleanup_(sysview_device_freep) sysview_device *device = NULL;
-        int r;
-
-        assert_return(seat, -EINVAL);
-        assert_return(name, -EINVAL);
-
-        device = new0(sysview_device, 1);
-        if (!device)
-                return -ENOMEM;
-
-        device->seat = seat;
-        device->type = (unsigned)-1;
-
-        device->name = strdup(name);
-        if (!device->name)
-                return -ENOMEM;
-
-        r = hashmap_put(seat->context->device_map, device->name, device);
-        if (r < 0)
-                return r;
-
-        r = hashmap_put(seat->device_map, device->name, device);
-        if (r < 0)
-                return r;
-
-        if (out)
-                *out = device;
-        device = NULL;
-        return 0;
-}
-
-sysview_device *sysview_device_free(sysview_device *device) {
-        if (!device)
-                return NULL;
-
-        if (device->name) {
-                hashmap_remove_value(device->seat->device_map, device->name, device);
-                hashmap_remove_value(device->seat->context->device_map, device->name, device);
-        }
-
-        switch (device->type) {
-        case SYSVIEW_DEVICE_EVDEV:
-                device->evdev.ud = udev_device_unref(device->evdev.ud);
-                break;
-        case SYSVIEW_DEVICE_DRM:
-                device->drm.ud = udev_device_unref(device->drm.ud);
-                break;
-        }
-
-        free(device->name);
-        free(device);
-
-        return NULL;
-}
-
-const char *sysview_device_get_name(sysview_device *device) {
-        assert_return(device, NULL);
-
-        return device->name;
-}
-
-unsigned int sysview_device_get_type(sysview_device *device) {
-        assert_return(device, (unsigned)-1);
-
-        return device->type;
-}
-
-struct udev_device *sysview_device_get_ud(sysview_device *device) {
-        assert_return(device, NULL);
-
-        switch (device->type) {
-        case SYSVIEW_DEVICE_EVDEV:
-                return device->evdev.ud;
-        case SYSVIEW_DEVICE_DRM:
-                return device->drm.ud;
-        default:
-                assert_return(0, NULL);
-        }
-}
-
-static int device_new_ud(sysview_device **out, sysview_seat *seat, unsigned int type, struct udev_device *ud) {
-        _cleanup_(sysview_device_freep) sysview_device *device = NULL;
-        int r;
-
-        assert_return(seat, -EINVAL);
-        assert_return(ud, -EINVAL);
-
-        r = sysview_device_new(&device, seat, udev_device_get_syspath(ud));
-        if (r < 0)
-                return r;
-
-        device->type = type;
-
-        switch (type) {
-        case SYSVIEW_DEVICE_EVDEV:
-                device->evdev.ud = udev_device_ref(ud);
-                break;
-        case SYSVIEW_DEVICE_DRM:
-                device->drm.ud = udev_device_ref(ud);
-                break;
-        default:
-                assert_not_reached("sysview: invalid udev-device type");
-        }
-
-        if (out)
-                *out = device;
-        device = NULL;
-        return 0;
-}
-
-/*
- * Sessions
- */
-
-sysview_session *sysview_find_session(sysview_context *c, const char *name) {
-        assert_return(c, NULL);
-        assert_return(name, NULL);
-
-        return hashmap_get(c->session_map, name);
-}
-
-int sysview_session_new(sysview_session **out, sysview_seat *seat, const char *name) {
-        _cleanup_(sysview_session_freep) sysview_session *session = NULL;
-        int r;
-
-        assert_return(seat, -EINVAL);
-
-        session = new0(sysview_session, 1);
-        if (!session)
-                return -ENOMEM;
-
-        session->seat = seat;
-
-        if (name) {
-                /*
-                 * If a name is given, we require it to be a logind session
-                 * name. The session will be put in managed mode and we use
-                 * logind to request controller access.
-                 */
-
-                session->name = strdup(name);
-                if (!session->name)
-                        return -ENOMEM;
-
-                r = sd_bus_path_encode("/org/freedesktop/login1/session",
-                                       session->name, &session->path);
-                if (r < 0)
-                        return r;
-
-                session->custom = false;
-        } else {
-                /*
-                 * No session name was given. We assume this is an unmanaged
-                 * session controlled by the application. We don't use logind
-                 * at all and leave session management to the application. The
-                 * name of the session-object is set to a unique random string
-                 * that does not clash with the logind namespace.
-                 */
-
-                r = asprintf(&session->name, "@custom%" PRIu64,
-                             ++seat->context->custom_sid);
-                if (r < 0)
-                        return -ENOMEM;
-
-                session->custom = true;
-        }
-
-        r = hashmap_put(seat->context->session_map, session->name, session);
-        if (r < 0)
-                return r;
-
-        r = hashmap_put(seat->session_map, session->name, session);
-        if (r < 0)
-                return r;
-
-        if (out)
-                *out = session;
-        session = NULL;
-        return 0;
-}
-
-sysview_session *sysview_session_free(sysview_session *session) {
-        if (!session)
-                return NULL;
-
-        assert(!session->public);
-        assert(!session->wants_control);
-
-        if (session->name) {
-                hashmap_remove_value(session->seat->session_map, session->name, session);
-                hashmap_remove_value(session->seat->context->session_map, session->name, session);
-        }
-
-        free(session->path);
-        free(session->name);
-        free(session);
-
-        return NULL;
-}
-
-void sysview_session_set_userdata(sysview_session *session, void *userdata) {
-        assert(session);
-
-        session->userdata = userdata;
-}
-
-void *sysview_session_get_userdata(sysview_session *session) {
-        assert_return(session, NULL);
-
-        return session->userdata;
-}
-
-const char *sysview_session_get_name(sysview_session *session) {
-        assert_return(session, NULL);
-
-        return session->name;
-}
-
-sysview_seat *sysview_session_get_seat(sysview_session *session) {
-        assert_return(session, NULL);
-
-        return session->seat;
-}
-
-static int session_take_control_fn(sd_bus_message *reply,
-                                   void *userdata,
-                                   sd_bus_error *ret_error) {
-        sysview_session *session = userdata;
-        int r, error;
-
-        session->slot_take_control = sd_bus_slot_unref(session->slot_take_control);
-
-        if (sd_bus_message_is_method_error(reply, NULL)) {
-                const sd_bus_error *e = sd_bus_message_get_error(reply);
-
-                log_debug("sysview: %s: TakeControl failed: %s: %s",
-                          session->name, e->name, e->message);
-                error = -sd_bus_error_get_errno(e);
-        } else {
-                session->has_control = true;
-                error = 0;
-        }
-
-        r = context_raise_session_control(session->seat->context, session, error);
-        if (r < 0)
-                log_debug_errno(r, "sysview: callback failed while signalling session control '%d' on session '%s': %m",
-                                error, session->name);
-
-        return 0;
-}
-
-int sysview_session_take_control(sysview_session *session) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
-        int r;
-
-        assert_return(session, -EINVAL);
-        assert_return(!session->custom, -EINVAL);
-
-        if (session->wants_control)
-                return 0;
-
-        r = sd_bus_message_new_method_call(session->seat->context->sysbus,
-                                           &m,
-                                           "org.freedesktop.login1",
-                                           session->path,
-                                           "org.freedesktop.login1.Session",
-                                           "TakeControl");
-        if (r < 0)
-                return r;
-
-        r = sd_bus_message_append(m, "b", 0);
-        if (r < 0)
-                return r;
-
-        r = sd_bus_call_async(session->seat->context->sysbus,
-                              &session->slot_take_control,
-                              m,
-                              session_take_control_fn,
-                              session,
-                              0);
-        if (r < 0)
-                return r;
-
-        session->wants_control = true;
-        return 0;
-}
-
-void sysview_session_release_control(sysview_session *session) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
-        int r;
-
-        assert(session);
-        assert(!session->custom);
-
-        if (!session->wants_control)
-                return;
-
-        session->wants_control = false;
-
-        if (!session->has_control && !session->slot_take_control)
-                return;
-
-        session->has_control = false;
-        session->slot_take_control = sd_bus_slot_unref(session->slot_take_control);
-
-        r = sd_bus_message_new_method_call(session->seat->context->sysbus,
-                                           &m,
-                                           "org.freedesktop.login1",
-                                           session->path,
-                                           "org.freedesktop.login1.Session",
-                                           "ReleaseControl");
-        if (r >= 0)
-                r = sd_bus_send(session->seat->context->sysbus, m, NULL);
-
-        if (r < 0 && r != -ENOTCONN)
-                log_debug_errno(r, "sysview: %s: cannot send ReleaseControl: %m",
-                                session->name);
-}
-
-/*
- * Seats
- */
-
-sysview_seat *sysview_find_seat(sysview_context *c, const char *name) {
-        assert_return(c, NULL);
-        assert_return(name, NULL);
-
-        return hashmap_get(c->seat_map, name);
-}
-
-int sysview_seat_new(sysview_seat **out, sysview_context *c, const char *name) {
-        _cleanup_(sysview_seat_freep) sysview_seat *seat = NULL;
-        int r;
-
-        assert_return(c, -EINVAL);
-        assert_return(name, -EINVAL);
-
-        seat = new0(sysview_seat, 1);
-        if (!seat)
-                return -ENOMEM;
-
-        seat->context = c;
-
-        seat->name = strdup(name);
-        if (!seat->name)
-                return -ENOMEM;
-
-        r = sd_bus_path_encode("/org/freedesktop/login1/seat", seat->name, &seat->path);
-        if (r < 0)
-                return r;
-
-        seat->session_map = hashmap_new(&string_hash_ops);
-        if (!seat->session_map)
-                return -ENOMEM;
-
-        seat->device_map = hashmap_new(&string_hash_ops);
-        if (!seat->device_map)
-                return -ENOMEM;
-
-        r = hashmap_put(c->seat_map, seat->name, seat);
-        if (r < 0)
-                return r;
-
-        if (out)
-                *out = seat;
-        seat = NULL;
-        return 0;
-}
-
-sysview_seat *sysview_seat_free(sysview_seat *seat) {
-        if (!seat)
-                return NULL;
-
-        assert(!seat->public);
-        assert(hashmap_size(seat->device_map) == 0);
-        assert(hashmap_size(seat->session_map) == 0);
-
-        if (seat->name)
-                hashmap_remove_value(seat->context->seat_map, seat->name, seat);
-
-        hashmap_free(seat->device_map);
-        hashmap_free(seat->session_map);
-        free(seat->path);
-        free(seat->name);
-        free(seat);
-
-        return NULL;
-}
-
-const char *sysview_seat_get_name(sysview_seat *seat) {
-        assert_return(seat, NULL);
-
-        return seat->name;
-}
-
-int sysview_seat_switch_to(sysview_seat *seat, uint32_t nr) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
-        int r;
-
-        assert_return(seat, -EINVAL);
-        assert_return(seat->context->sysbus, -EINVAL);
-
-        r = sd_bus_message_new_method_call(seat->context->sysbus,
-                                           &m,
-                                           "org.freedesktop.login1",
-                                           seat->path,
-                                           "org.freedesktop.login1.Seat",
-                                           "SwitchTo");
-        if (r < 0)
-                return r;
-
-        r = sd_bus_message_append(m, "u", nr);
-        if (r < 0)
-                return r;
-
-        return sd_bus_send(seat->context->sysbus, m, NULL);
-}
-
-/*
- * Contexts
- */
-
-static int context_raise(sysview_context *c, sysview_event *event, int def) {
-        return c->running ? c->event_fn(c, c->userdata, event) : def;
-}
-
-static int context_raise_settle(sysview_context *c) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SETTLE,
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_seat_add(sysview_context *c, sysview_seat *seat) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SEAT_ADD,
-                .seat_add = {
-                        .seat = seat,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_seat_remove(sysview_context *c, sysview_seat *seat) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SEAT_REMOVE,
-                .seat_remove = {
-                        .seat = seat,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_filter(sysview_context *c,
-                                        const char *id,
-                                        const char *seatid,
-                                        const char *username,
-                                        unsigned int uid) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_FILTER,
-                .session_filter = {
-                        .id = id,
-                        .seatid = seatid,
-                        .username = username,
-                        .uid = uid,
-                }
-        };
-
-        return context_raise(c, &event, 1);
-}
-
-static int context_raise_session_add(sysview_context *c, sysview_session *session) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_ADD,
-                .session_add = {
-                        .session = session,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_remove(sysview_context *c, sysview_session *session) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_REMOVE,
-                .session_remove = {
-                        .session = session,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_control(sysview_context *c, sysview_session *session, int error) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_CONTROL,
-                .session_control = {
-                        .session = session,
-                        .error = error,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_attach(sysview_context *c, sysview_session *session, sysview_device *device) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_ATTACH,
-                .session_attach = {
-                        .session = session,
-                        .device = device,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_detach(sysview_context *c, sysview_session *session, sysview_device *device) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_DETACH,
-                .session_detach = {
-                        .session = session,
-                        .device = device,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static int context_raise_session_refresh(sysview_context *c, sysview_session *session, sysview_device *device, struct udev_device *ud) {
-        sysview_event event = {
-                .type = SYSVIEW_EVENT_SESSION_REFRESH,
-                .session_refresh = {
-                        .session = session,
-                        .device = device,
-                        .ud = ud,
-                }
-        };
-
-        return context_raise(c, &event, 0);
-}
-
-static void context_settle(sysview_context *c) {
-        int r;
-
-        if (c->n_probe <= 0 || --c->n_probe > 0)
-                return;
-
-        log_debug("sysview: settle");
-
-        c->settled = true;
-
-        r = context_raise_settle(c);
-        if (r < 0)
-                log_debug_errno(r, "sysview: callback failed on settle: %m");
-}
-
-static void context_add_device(sysview_context *c, sysview_device *device) {
-        sysview_session *session;
-        Iterator i;
-        int r;
-
-        assert(c);
-        assert(device);
-
-        log_debug("sysview: add device '%s' on seat '%s'",
-                  device->name, device->seat->name);
-
-        HASHMAP_FOREACH(session, device->seat->session_map, i) {
-                if (!session->public)
-                        continue;
-
-                r = context_raise_session_attach(c, session, device);
-                if (r < 0)
-                        log_debug_errno(r, "sysview: callback failed while attaching device '%s' to session '%s': %m",
-                                        device->name, session->name);
-        }
-}
-
-static void context_remove_device(sysview_context *c, sysview_device *device) {
-        sysview_session *session;
-        Iterator i;
-        int r;
-
-        assert(c);
-        assert(device);
-
-        log_debug("sysview: remove device '%s'", device->name);
-
-        HASHMAP_FOREACH(session, device->seat->session_map, i) {
-                if (!session->public)
-                        continue;
-
-                r = context_raise_session_detach(c, session, device);
-                if (r < 0)
-                        log_debug_errno(r, "sysview: callback failed while detaching device '%s' from session '%s': %m",
-                                        device->name, session->name);
-        }
-
-        sysview_device_free(device);
-}
-
-static void context_change_device(sysview_context *c, sysview_device *device, struct udev_device *ud) {
-        sysview_session *session;
-        Iterator i;
-        int r;
-
-        assert(c);
-        assert(device);
-
-        log_debug("sysview: change device '%s'", device->name);
-
-        HASHMAP_FOREACH(session, device->seat->session_map, i) {
-                if (!session->public)
-                        continue;
-
-                r = context_raise_session_refresh(c, session, device, ud);
-                if (r < 0)
-                        log_debug_errno(r, "sysview: callback failed while changing device '%s' on session '%s': %m",
-                                        device->name, session->name);
-        }
-}
-
-static void context_add_session(sysview_context *c, sysview_seat *seat, const char *id) {
-        sysview_session *session;
-        sysview_device *device;
-        Iterator i;
-        int r;
-
-        assert(c);
-        assert(seat);
-        assert(id);
-
-        session = sysview_find_session(c, id);
-        if (session)
-                return;
-
-        log_debug("sysview: add session '%s' on seat '%s'", id, seat->name);
-
-        r = sysview_session_new(&session, seat, id);
-        if (r < 0)
-                goto error;
-
-        if (!seat->scanned) {
-                r = sysview_context_rescan(c);
-                if (r < 0)
-                        goto error;
-        }
-
-        if (seat->public) {
-                session->public = true;
-                r = context_raise_session_add(c, session);
-                if (r < 0) {
-                        log_debug_errno(r, "sysview: callback failed while adding session '%s': %m",
-                                        session->name);
-                        session->public = false;
-                        goto error;
-                }
-
-                HASHMAP_FOREACH(device, seat->device_map, i) {
-                        r = context_raise_session_attach(c, session, device);
-                        if (r < 0)
-                                log_debug_errno(r, "sysview: callback failed while attaching device '%s' to new session '%s': %m",
-                                                device->name, session->name);
-                }
-        }
-
-        return;
-
-error:
-        if (r < 0)
-                log_debug_errno(r, "sysview: error while adding session '%s': %m",
-                                id);
-}
-
-static void context_remove_session(sysview_context *c, sysview_session *session) {
-        sysview_device *device;
-        Iterator i;
-        int r;
-
-        assert(c);
-        assert(session);
-
-        log_debug("sysview: remove session '%s'", session->name);
-
-        if (session->public) {
-                HASHMAP_FOREACH(device, session->seat->device_map, i) {
-                        r = context_raise_session_detach(c, session, device);
-                        if (r < 0)
-                                log_debug_errno(r, "sysview: callback failed while detaching device '%s' from old session '%s': %m",
-                                                device->name, session->name);
-                }
-
-                session->public = false;
-                r = context_raise_session_remove(c, session);
-                if (r < 0)
-                        log_debug_errno(r, "sysview: callback failed while removing session '%s': %m",
-                                        session->name);
-        }
-
-        if (!session->custom)
-                sysview_session_release_control(session);
-
-        sysview_session_free(session);
-}
-
-static void context_add_seat(sysview_context *c, const char *id) {
-        sysview_seat *seat;
-        int r;
-
-        assert(c);
-        assert(id);
-
-        seat = sysview_find_seat(c, id);
-        if (seat)
-                return;
-
-        log_debug("sysview: add seat '%s'", id);
-
-        r = sysview_seat_new(&seat, c, id);
-        if (r < 0)
-                goto error;
-
-        seat->public = true;
-        r = context_raise_seat_add(c, seat);
-        if (r < 0) {
-                log_debug_errno(r, "sysview: callback failed while adding seat '%s': %m",
-                                seat->name);
-                seat->public = false;
-        }
-
-        return;
-
-error:
-        if (r < 0)
-                log_debug_errno(r, "sysview: error while adding seat '%s': %m",
-                                id);
-}
-
-static void context_remove_seat(sysview_context *c, sysview_seat *seat) {
-        sysview_session *session;
-        sysview_device *device;
-        int r;
-
-        assert(c);
-        assert(seat);
-
-        log_debug("sysview: remove seat '%s'", seat->name);
-
-        while ((device = hashmap_first(seat->device_map)))
-                context_remove_device(c, device);
-
-        while ((session = hashmap_first(seat->session_map)))
-                context_remove_session(c, session);
-
-        if (seat->public) {
-                seat->public = false;
-                r = context_raise_seat_remove(c, seat);
-                if (r < 0)
-                        log_debug_errno(r, "sysview: callback failed while removing seat '%s': %m",
-                                        seat->name);
-        }
-
-        sysview_seat_free(seat);
-}
-
-int sysview_context_new(sysview_context **out,
-                        unsigned int flags,
-                        sd_event *event,
-                        sd_bus *sysbus,
-                        struct udev *ud) {
-        _cleanup_(sysview_context_freep) sysview_context *c = NULL;
-        int r;
-
-        assert_return(out, -EINVAL);
-        assert_return(event, -EINVAL);
-
-        log_debug("sysview: new");
-
-        c = new0(sysview_context, 1);
-        if (!c)
-                return -ENOMEM;
-
-        c->event = sd_event_ref(event);
-        if (flags & SYSVIEW_CONTEXT_SCAN_LOGIND)
-                c->scan_logind = true;
-        if (flags & SYSVIEW_CONTEXT_SCAN_EVDEV)
-                c->scan_evdev = true;
-        if (flags & SYSVIEW_CONTEXT_SCAN_DRM)
-                c->scan_drm = true;
-
-        if (sysbus) {
-                c->sysbus = sd_bus_ref(sysbus);
-        } else if (c->scan_logind) {
-                r = sd_bus_open_system(&c->sysbus);
-                if (r < 0)
-                        return r;
-        }
-
-        if (ud) {
-                c->ud = udev_ref(ud);
-        } else if (c->scan_evdev || c->scan_drm) {
-                errno = 0;
-                c->ud = udev_new();
-                if (!c->ud)
-                        return errno > 0 ? -errno : -EFAULT;
-        }
-
-        c->seat_map = hashmap_new(&string_hash_ops);
-        if (!c->seat_map)
-                return -ENOMEM;
-
-        c->session_map = hashmap_new(&string_hash_ops);
-        if (!c->session_map)
-                return -ENOMEM;
-
-        c->device_map = hashmap_new(&string_hash_ops);
-        if (!c->device_map)
-                return -ENOMEM;
-
-        *out = c;
-        c = NULL;
-        return 0;
-}
-
-sysview_context *sysview_context_free(sysview_context *c) {
-        if (!c)
-                return NULL;
-
-        log_debug("sysview: free");
-
-        sysview_context_stop(c);
-
-        assert(hashmap_size(c->device_map) == 0);
-        assert(hashmap_size(c->session_map) == 0);
-        assert(hashmap_size(c->seat_map) == 0);
-
-        hashmap_free(c->device_map);
-        hashmap_free(c->session_map);
-        hashmap_free(c->seat_map);
-        c->ud = udev_unref(c->ud);
-        c->sysbus = sd_bus_unref(c->sysbus);
-        c->event = sd_event_unref(c->event);
-        free(c);
-
-        return NULL;
-}
-
-static int context_ud_prepare_monitor(sysview_context *c, struct udev_monitor *m) {
-        int r;
-
-        if (c->scan_evdev) {
-                r = udev_monitor_filter_add_match_subsystem_devtype(m, "input", NULL);
-                if (r < 0)
-                        return r;
-        }
-
-        if (c->scan_drm) {
-                r = udev_monitor_filter_add_match_subsystem_devtype(m, "drm", NULL);
-                if (r < 0)
-                        return r;
-        }
-
-        return 0;
-}
-
-static int context_ud_prepare_scan(sysview_context *c, struct udev_enumerate *e) {
-        int r;
-
-        if (c->scan_evdev) {
-                r = udev_enumerate_add_match_subsystem(e, "input");
-                if (r < 0)
-                        return r;
-        }
-
-        if (c->scan_drm) {
-                r = udev_enumerate_add_match_subsystem(e, "drm");
-                if (r < 0)
-                        return r;
-        }
-
-        r = udev_enumerate_add_match_is_initialized(e);
-        if (r < 0)
-                return r;
-
-        return 0;
-}
-
-static int context_ud_hotplug(sysview_context *c, struct udev_device *d) {
-        const char *syspath, *sysname, *subsystem, *action, *seatname;
-        sysview_device *device;
-        int r;
-
-        syspath = udev_device_get_syspath(d);
-        sysname = udev_device_get_sysname(d);
-        subsystem = udev_device_get_subsystem(d);
-        action = udev_device_get_action(d);
-
-        /* not interested in custom devices without syspath/etc */
-        if (!syspath || !sysname || !subsystem)
-                return 0;
-
-        device = sysview_find_device(c, syspath);
-
-        if (streq_ptr(action, "remove")) {
-                if (!device)
-                        return 0;
-
-                context_remove_device(c, device);
-        } else if (streq_ptr(action, "change")) {
-                if (!device)
-                        return 0;
-
-                context_change_device(c, device, d);
-        } else if (!action || streq_ptr(action, "add")) {
-                struct udev_device *p;
-                unsigned int type, t;
-                sysview_seat *seat;
-
-                if (device)
-                        return 0;
-
-                if (streq(subsystem, "input") && startswith(sysname, "event") && safe_atou(sysname + 5, &t) >= 0)
-                        type = SYSVIEW_DEVICE_EVDEV;
-                else if (streq(subsystem, "drm") && startswith(sysname, "card"))
-                        type = SYSVIEW_DEVICE_DRM;
-                else
-                        type = (unsigned)-1;
-
-                if (type >= SYSVIEW_DEVICE_CNT)
-                        return 0;
-
-                p = d;
-                seatname = NULL;
-                do {
-                        seatname = udev_device_get_property_value(p, "ID_SEAT");
-                        if (seatname)
-                                break;
-                } while ((p = udev_device_get_parent(p)));
-
-                seat = sysview_find_seat(c, seatname ? : "seat0");
-                if (!seat)
-                        return 0;
-
-                r = device_new_ud(&device, seat, type, d);
-                if (r < 0)
-                        return log_debug_errno(r, "sysview: cannot create device for udev-device '%s': %m",
-                                               syspath);
-
-                context_add_device(c, device);
-        }
-
-        return 0;
-}
-
-static int context_ud_monitor_fn(sd_event_source *s,
-                                 int fd,
-                                 uint32_t revents,
-                                 void *userdata) {
-        sysview_context *c = userdata;
-        struct udev_device *d;
-        int r;
-
-        if (revents & EPOLLIN) {
-                while ((d = udev_monitor_receive_device(c->ud_monitor))) {
-                        r = context_ud_hotplug(c, d);
-                        udev_device_unref(d);
-                        if (r != 0)
-                                return r;
-                }
-
-                /* as long as EPOLLIN is signalled, read pending data */
-                return 0;
-        }
-
-        if (revents & (EPOLLHUP | EPOLLERR)) {
-                log_debug("sysview: HUP on udev-monitor");
-                c->ud_monitor_src = sd_event_source_unref(c->ud_monitor_src);
-        }
-
-        return 0;
-}
-
-static int context_ud_start(sysview_context *c) {
-        int r, fd;
-
-        if (!c->ud)
-                return 0;
-
-        errno = 0;
-        c->ud_monitor = udev_monitor_new_from_netlink(c->ud, "udev");
-        if (!c->ud_monitor)
-                return errno > 0 ? -errno : -EFAULT;
-
-        r = context_ud_prepare_monitor(c, c->ud_monitor);
-        if (r < 0)
-                return r;
-
-        r = udev_monitor_enable_receiving(c->ud_monitor);
-        if (r < 0)
-                return r;
-
-        fd = udev_monitor_get_fd(c->ud_monitor);
-        r = sd_event_add_io(c->event,
-                            &c->ud_monitor_src,
-                            fd,
-                            EPOLLHUP | EPOLLERR | EPOLLIN,
-                            context_ud_monitor_fn,
-                            c);
-        if (r < 0)
-                return r;
-
-        return 0;
-}
-
-static void context_ud_stop(sysview_context *c) {
-        c->ud_monitor_src = sd_event_source_unref(c->ud_monitor_src);
-        c->ud_monitor = udev_monitor_unref(c->ud_monitor);
-}
-
-static int context_ud_scan(sysview_context *c) {
-        _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
-        struct udev_list_entry *entry;
-        struct udev_device *d;
-        int r;
-
-        if (!c->ud_monitor)
-                return 0;
-
-        errno = 0;
-        e = udev_enumerate_new(c->ud);
-        if (!e)
-                return errno > 0 ? -errno : -EFAULT;
-
-        r = context_ud_prepare_scan(c, e);
-        if (r < 0)
-                return r;
-
-        r = udev_enumerate_scan_devices(e);
-        if (r < 0)
-                return r;
-
-        udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
-                const char *name;
-
-                name = udev_list_entry_get_name(entry);
-
-                errno = 0;
-                d = udev_device_new_from_syspath(c->ud, name);
-                if (!d) {
-                        r = errno > 0 ? -errno : -EFAULT;
-                        log_debug_errno(r, "sysview: cannot create udev-device for %s: %m",
-                                        name);
-                        continue;
-                }
-
-                r = context_ud_hotplug(c, d);
-                udev_device_unref(d);
-                if (r != 0)
-                        return r;
-        }
-
-        return 0;
-}
-
-static int context_ld_seat_new(sysview_context *c, sd_bus_message *signal) {
-        const char *id, *path;
-        int r;
-
-        r = sd_bus_message_read(signal, "so", &id, &path);
-        if (r < 0)
-                return log_debug_errno(r, "sysview: cannot parse SeatNew from logind: %m");
-
-        context_add_seat(c, id);
-        return 0;
-}
-
-static int context_ld_seat_removed(sysview_context *c, sd_bus_message *signal) {
-        const char *id, *path;
-        sysview_seat *seat;
-        int r;
-
-        r = sd_bus_message_read(signal, "so", &id, &path);
-        if (r < 0)
-                return log_debug_errno(r, "sysview: cannot parse SeatRemoved from logind: %m");
-
-        seat = sysview_find_seat(c, id);
-        if (!seat)
-                return 0;
-
-        context_remove_seat(c, seat);
-        return 0;
-}
-
-static int context_ld_session_new(sysview_context *c, sd_bus_message *signal) {
-        _cleanup_free_ char *seatid = NULL, *username = NULL;
-        const char *id, *path;
-        sysview_seat *seat;
-        uid_t uid;
-        int r;
-
-        r = sd_bus_message_read(signal, "so", &id, &path);
-        if (r < 0)
-                return log_debug_errno(r, "sysview: cannot parse SessionNew from logind: %m");
-
-        /*
-         * As the dbus message didn't contain enough information, we
-         * read missing bits via sd-login. Note that this might race session
-         * destruction, so we handle ENOENT properly.
-         */
-
-        /* ENOENT is also returned for sessions without seats */
-        r = sd_session_get_seat(id, &seatid);
-        if (r == -ENOENT)
-                return 0;
-        else if (r < 0)
-                goto error;
-
-        seat = sysview_find_seat(c, seatid);
-        if (!seat)
-                return 0;
-
-        r = sd_session_get_uid(id, &uid);
-        if (r == -ENOENT)
-                return 0;
-        else if (r < 0)
-                goto error;
-
-        username = lookup_uid(uid);
-        if (!username) {
-                r = -ENOMEM;
-                goto error;
-        }
-
-        r = context_raise_session_filter(c, id, seatid, username, uid);
-        if (r < 0)
-                log_debug_errno(r, "sysview: callback failed while filtering session '%s': %m",
-                                id);
-        else if (r > 0)
-                context_add_session(c, seat, id);
-
-        return 0;
-
-error:
-        return log_debug_errno(r, "sysview: failed retrieving information for new session '%s': %m",
-                               id);
-}
-
-static int context_ld_session_removed(sysview_context *c, sd_bus_message *signal) {
-        sysview_session *session;
-        const char *id, *path;
-        int r;
-
-        r = sd_bus_message_read(signal, "so", &id, &path);
-        if (r < 0)
-                return log_debug_errno(r, "sysview: cannot parse SessionRemoved from logind: %m");
-
-        session = sysview_find_session(c, id);
-        if (!session)
-                return 0;
-
-        context_remove_session(c, session);
-        return 0;
-}
-
-static int context_ld_manager_signal_fn(sd_bus_message *signal,
-                                        void *userdata,
-                                        sd_bus_error *ret_error) {
-        sysview_context *c = userdata;
-
-        if (sd_bus_message_is_signal(signal, "org.freedesktop.login1.Manager", "SeatNew"))
-                return context_ld_seat_new(c, signal);
-        else if (sd_bus_message_is_signal(signal, "org.freedesktop.login1.Manager", "SeatRemoved"))
-                return context_ld_seat_removed(c, signal);
-        else if (sd_bus_message_is_signal(signal, "org.freedesktop.login1.Manager", "SessionNew"))
-                return context_ld_session_new(c, signal);
-        else if (sd_bus_message_is_signal(signal, "org.freedesktop.login1.Manager", "SessionRemoved"))
-                return context_ld_session_removed(c, signal);
-        else
-                return 0;
-}
-
-static int context_ld_start(sysview_context *c) {
-        int r;
-
-        if (!c->scan_logind)
-                return 0;
-
-        r = sd_bus_add_match(c->sysbus,
-                             &c->ld_slot_manager_signal,
-                             "type='signal',"
-                             "sender='org.freedesktop.login1',"
-                             "interface='org.freedesktop.login1.Manager',"
-                             "path='/org/freedesktop/login1'",
-                             context_ld_manager_signal_fn,
-                             c);
-        if (r < 0)
-                return r;
-
-        return 0;
-}
-
-static void context_ld_stop(sysview_context *c) {
-        c->ld_slot_list_sessions = sd_bus_slot_unref(c->ld_slot_list_sessions);
-        c->ld_slot_list_seats = sd_bus_slot_unref(c->ld_slot_list_seats);
-        c->ld_slot_manager_signal = sd_bus_slot_unref(c->ld_slot_manager_signal);
-}
-
-static int context_ld_list_seats_fn(sd_bus_message *reply,
-                                    void *userdata,
-                                    sd_bus_error *ret_error) {
-        sysview_context *c = userdata;
-        int r;
-
-        c->ld_slot_list_seats = sd_bus_slot_unref(c->ld_slot_list_seats);
-
-        if (sd_bus_message_is_method_error(reply, NULL)) {
-                const sd_bus_error *error = sd_bus_message_get_error(reply);
-
-                log_debug("sysview: ListSeats on logind failed: %s: %s",
-                          error->name, error->message);
-                r = -sd_bus_error_get_errno(error);
-                goto settle;
-        }
-
-        r = sd_bus_message_enter_container(reply, 'a', "(so)");
-        if (r < 0)
-                goto error;
-
-        while ((r = sd_bus_message_enter_container(reply, 'r', "so")) > 0) {
-                const char *id, *path;
-
-                r = sd_bus_message_read(reply, "so", &id, &path);
-                if (r < 0)
-                        goto error;
-
-                context_add_seat(c, id);
-
-                r = sd_bus_message_exit_container(reply);
-                if (r < 0)
-                        goto error;
-        }
-
-        if (r < 0)
-                goto error;
-
-        r = sd_bus_message_exit_container(reply);
-        if (r < 0)
-                goto error;
-
-        r = 0;
-        goto settle;
-
-error:
-        log_debug_errno(r, "sysview: erroneous ListSeats response from logind: %m");
-settle:
-        context_settle(c);
-        return r;
-}
-
-static int context_ld_list_sessions_fn(sd_bus_message *reply,
-                                       void *userdata,
-                                       sd_bus_error *ret_error) {
-        sysview_context *c = userdata;
-        int r;
-
-        c->ld_slot_list_sessions = sd_bus_slot_unref(c->ld_slot_list_sessions);
-
-        if (sd_bus_message_is_method_error(reply, NULL)) {
-                const sd_bus_error *error = sd_bus_message_get_error(reply);
-
-                log_debug("sysview: ListSessions on logind failed: %s: %s",
-                          error->name, error->message);
-                r = -sd_bus_error_get_errno(error);
-                goto settle;
-        }
-
-        r = sd_bus_message_enter_container(reply, 'a', "(susso)");
-        if (r < 0)
-                goto error;
-
-        while ((r = sd_bus_message_enter_container(reply, 'r', "susso")) > 0) {
-                const char *id, *username, *seatid, *path;
-                sysview_seat *seat;
-                unsigned int uid;
-
-                r = sd_bus_message_read(reply,
-                                        "susso",
-                                        &id,
-                                        &uid,
-                                        &username,
-                                        &seatid,
-                                        &path);
-                if (r < 0)
-                        goto error;
-
-                seat = sysview_find_seat(c, seatid);
-                if (seat) {
-                        r = context_raise_session_filter(c, id, seatid, username, uid);
-                        if (r < 0)
-                                log_debug_errno(r, "sysview: callback failed while filtering session '%s': %m",
-                                                id);
-                        else if (r > 0)
-                                context_add_session(c, seat, id);
-                }
-
-                r = sd_bus_message_exit_container(reply);
-                if (r < 0)
-                        goto error;
-        }
-
-        if (r < 0)
-                goto error;
-
-        r = sd_bus_message_exit_container(reply);
-        if (r < 0)
-                goto error;
-
-        r = 0;
-        goto settle;
-
-error:
-        log_debug_errno(r, "sysview: erroneous ListSessions response from logind: %m");
-settle:
-        context_settle(c);
-        return r;
-}
-
-static int context_ld_scan(sysview_context *c) {
-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
-        int r;
-
-        if (!c->ld_slot_manager_signal)
-                return 0;
-
-        /* request seat list */
-
-        r = sd_bus_message_new_method_call(c->sysbus,
-                                           &m,
-                                           "org.freedesktop.login1",
-                                           "/org/freedesktop/login1",
-                                           "org.freedesktop.login1.Manager",
-                                           "ListSeats");
-        if (r < 0)
-                return r;
-
-        r = sd_bus_call_async(c->sysbus,
-                              &c->ld_slot_list_seats,
-                              m,
-                              context_ld_list_seats_fn,
-                              c,
-                              0);
-        if (r < 0)
-                return r;
-
-        if (!c->settled)
-                ++c->n_probe;
-
-        /* request session list */
-
-        m = sd_bus_message_unref(m);
-        r = sd_bus_message_new_method_call(c->sysbus,
-                                           &m,
-                                           "org.freedesktop.login1",
-                                           "/org/freedesktop/login1",
-                                           "org.freedesktop.login1.Manager",
-                                           "ListSessions");
-        if (r < 0)
-                return r;
-
-        r = sd_bus_call_async(c->sysbus,
-                              &c->ld_slot_list_sessions,
-                              m,
-                              context_ld_list_sessions_fn,
-                              c,
-                              0);
-        if (r < 0)
-                return r;
-
-        if (!c->settled)
-                ++c->n_probe;
-
-        return 0;
-}
-
-bool sysview_context_is_running(sysview_context *c) {
-        return c && c->running;
-}
-
-int sysview_context_start(sysview_context *c, sysview_event_fn event_fn, void *userdata) {
-        int r;
-
-        assert_return(c, -EINVAL);
-        assert_return(event_fn, -EINVAL);
-
-        if (c->running)
-                return -EALREADY;
-
-        log_debug("sysview: start");
-
-        c->running = true;
-        c->event_fn = event_fn;
-        c->userdata = userdata;
-
-        r = context_ld_start(c);
-        if (r < 0)
-                goto error;
-
-        r = context_ud_start(c);
-        if (r < 0)
-                goto error;
-
-        r = sysview_context_rescan(c);
-        if (r < 0)
-                goto error;
-
-        return 0;
-
-error:
-        sysview_context_stop(c);
-        return r;
-}
-
-void sysview_context_stop(sysview_context *c) {
-        sysview_session *session;
-        sysview_device *device;
-        sysview_seat *seat;
-
-        assert(c);
-
-        if (!c->running)
-                return;
-
-        log_debug("sysview: stop");
-
-        while ((device = hashmap_first(c->device_map)))
-                context_remove_device(c, device);
-
-        while ((session = hashmap_first(c->session_map)))
-                context_remove_session(c, session);
-
-        while ((seat = hashmap_first(c->seat_map)))
-                context_remove_seat(c, seat);
-
-        c->running = false;
-        c->scanned = false;
-        c->settled = false;
-        c->n_probe = 0;
-        c->event_fn = NULL;
-        c->userdata = NULL;
-        c->scan_src = sd_event_source_unref(c->scan_src);
-        context_ud_stop(c);
-        context_ld_stop(c);
-}
-
-static int context_scan_fn(sd_event_source *s, void *userdata) {
-        sysview_context *c = userdata;
-        sysview_seat *seat;
-        Iterator i;
-        int r;
-
-        c->rescan = false;
-
-        if (!c->scanned) {
-                r = context_ld_scan(c);
-                if (r < 0)
-                        return log_debug_errno(r, "sysview: logind scan failed: %m");
-        }
-
-        /* skip device scans if no sessions are available */
-        if (hashmap_size(c->session_map) > 0) {
-                r = context_ud_scan(c);
-                if (r < 0)
-                        return log_debug_errno(r, "sysview: udev scan failed: %m");
-
-                HASHMAP_FOREACH(seat, c->seat_map, i)
-                        seat->scanned = true;
-        }
-
-        c->scanned = true;
-        context_settle(c);
-
-        return 0;
-}
-
-int sysview_context_rescan(sysview_context *c) {
-        assert(c);
-
-        if (!c->running)
-                return 0;
-
-        if (!c->rescan) {
-                c->rescan = true;
-                if (!c->settled)
-                        ++c->n_probe;
-        }
-
-        if (c->scan_src)
-                return sd_event_source_set_enabled(c->scan_src, SD_EVENT_ONESHOT);
-        else
-                return sd_event_add_defer(c->event, &c->scan_src, context_scan_fn, c);
-}