summaryrefslogtreecommitdiffstats
path: root/src/shell-util.c
blob: 37b0cfaf237ca80d34dd58b23006ace616a34e62 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

#include "config.h"

#include <errno.h>
#include <math.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif

#include <GL/gl.h>
#include <cogl/cogl.h>

#include "shell-app-cache-private.h"
#include "shell-util.h"
#include <glib/gi18n-lib.h>
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <meta/display.h>
#include <meta/meta-x11-display.h>

#include <locale.h>
#ifdef HAVE__NL_TIME_FIRST_WEEKDAY
#include <langinfo.h>
#endif

#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#include <systemd/sd-login.h>
#else
/* So we don't need to add ifdef's everywhere */
#define sd_notify(u, m)            do {} while (0)
#define sd_notifyf(u, m, ...)      do {} while (0)
#endif

static void
stop_pick (ClutterActor *actor)
{
  g_signal_stop_emission_by_name (actor, "pick");
}

/**
 * shell_util_set_hidden_from_pick:
 * @actor: A #ClutterActor
 * @hidden: Whether @actor should be hidden from pick
 *
 * If @hidden is %TRUE, hide @actor from pick even with a mode of
 * %CLUTTER_PICK_ALL; if @hidden is %FALSE, unhide @actor.
 */
void
shell_util_set_hidden_from_pick (ClutterActor *actor,
                                 gboolean      hidden)
{
  gpointer existing_handler_data;

  existing_handler_data = g_object_get_data (G_OBJECT (actor),
                                             "shell-stop-pick");
  if (hidden)
    {
      if (existing_handler_data != NULL)
        return;
      g_signal_connect (actor, "pick", G_CALLBACK (stop_pick), NULL);
      g_object_set_data (G_OBJECT (actor),
                         "shell-stop-pick", GUINT_TO_POINTER (1));
    }
  else
    {
      if (existing_handler_data == NULL)
        return;
      g_signal_handlers_disconnect_by_func (actor, stop_pick, NULL);
      g_object_set_data (G_OBJECT (actor), "shell-stop-pick", NULL);
    }
}

/**
 * shell_util_get_week_start:
 *
 * Gets the first week day for the current locale, expressed as a
 * number in the range 0..6, representing week days from Sunday to
 * Saturday.
 *
 * Returns: A number representing the first week day for the current
 *          locale
 */
/* Copied from gtkcalendar.c */
int
shell_util_get_week_start (void)
{
  int week_start;
#ifdef HAVE__NL_TIME_FIRST_WEEKDAY
  union { unsigned int word; char *string; } langinfo;
  int week_1stday = 0;
  int first_weekday = 1;
  guint week_origin;
#else
  char *gtk_week_start;
#endif

#ifdef HAVE__NL_TIME_FIRST_WEEKDAY
  langinfo.string = nl_langinfo (_NL_TIME_FIRST_WEEKDAY);
  first_weekday = langinfo.string[0];
  langinfo.string = nl_langinfo (_NL_TIME_WEEK_1STDAY);
  week_origin = langinfo.word;
  if (week_origin == 19971130) /* Sunday */
    week_1stday = 0;
  else if (week_origin == 19971201) /* Monday */
    week_1stday = 1;
  else
    g_warning ("Unknown value of _NL_TIME_WEEK_1STDAY.\n");

  week_start = (week_1stday + first_weekday - 1) % 7;
#else
  /* Use a define to hide the string from xgettext */
# define GTK_WEEK_START "calendar:week_start:0"
  gtk_week_start = dgettext ("gtk30", GTK_WEEK_START);

  if (strncmp (gtk_week_start, "calendar:week_start:", 20) == 0)
    week_start = *(gtk_week_start + 20) - '0';
  else
    week_start = -1;

  if (week_start < 0 || week_start > 6)
    {
      g_warning ("Whoever translated calendar:week_start:0 for GTK+ "
                 "did so wrongly.\n");
      week_start = 0;
    }
#endif

  return week_start;
}

/**
 * shell_util_translate_time_string:
 * @str: String to translate
 *
 * Translate @str according to the locale defined by LC_TIME; unlike
 * dcgettext(), the translations is still taken from the LC_MESSAGES
 * catalogue and not the LC_TIME one.
 *
 * Returns: the translated string
 */
const char *
shell_util_translate_time_string (const char *str)
{
  const char *locale = g_getenv ("LC_TIME");
  const char *res;
  char *sep;
  locale_t old_loc;
  locale_t loc = (locale_t) 0;

  if (locale)
    loc = newlocale (LC_MESSAGES_MASK, locale, (locale_t) 0);

  old_loc = uselocale (loc);

  sep = strchr (str, '\004');
  res = g_dpgettext (NULL, str, sep ? sep - str + 1 : 0);

  uselocale (old_loc);

  if (loc != (locale_t) 0)
    freelocale (loc);

  return res;
}

/**
 * shell_util_regex_escape:
 * @str: a UTF-8 string to escape
 *
 * A wrapper around g_regex_escape_string() that takes its argument as
 * \0-terminated string rather than a byte-array that confuses gjs.
 *
 * Returns: @str with all regex-special characters escaped
 */
char *
shell_util_regex_escape (const char *str)
{
  return g_regex_escape_string (str, -1);
}

/**
 * shell_write_string_to_stream:
 * @stream: a #GOutputStream
 * @str: a UTF-8 string to write to @stream
 * @error: location to store GError
 *
 * Write a string to a GOutputStream as UTF-8. This is a workaround
 * for not having binary buffers in GJS.
 *
 * Return value: %TRUE if write succeeded
 */
gboolean
shell_write_string_to_stream (GOutputStream *stream,
                              const char    *str,
                              GError       **error)
{
  return g_output_stream_write_all (stream, str, strlen (str),
                                    NULL, NULL, error);
}

/**
 * shell_get_file_contents_utf8_sync:
 * @path: UTF-8 encoded filename path
 * @error: a #GError
 *
 * Synchronously load the contents of a file as a NUL terminated
 * string, validating it as UTF-8.  Embedded NUL characters count as
 * invalid content.
 *
 * Returns: (transfer full): File contents
 */
char *
shell_get_file_contents_utf8_sync (const char *path,
                                   GError    **error)
{
  char *contents;
  gsize len;
  if (!g_file_get_contents (path, &contents, &len, error))
    return NULL;
  if (!g_utf8_validate (contents, len, NULL))
    {
      g_free (contents);
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_FAILED,
                   "File %s contains invalid UTF-8",
                   path);
      return NULL;
    }
  return contents;
}

static void
touch_file (GTask        *task,
            gpointer      object,
            gpointer      task_data,
            GCancellable *cancellable)
{
  GFile *file = object;
  g_autoptr (GFile) parent = NULL;
  g_autoptr (GFileOutputStream) stream = NULL;
  GError *error = NULL;

  parent = g_file_get_parent (file);
  g_file_make_directory_with_parents (parent, cancellable, &error);

  if (error && !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_EXISTS))
    {
      g_task_return_error (task, error);
      return;
    }
  g_clear_error (&error);

  stream = g_file_create (file, G_FILE_CREATE_NONE, cancellable, &error);

  if (error && !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_EXISTS))
    {
      g_task_return_error (task, error);
      return;
    }
  g_clear_error (&error);

  if (stream)
    g_output_stream_close (G_OUTPUT_STREAM (stream), NULL, NULL);

  g_task_return_boolean (task, stream != NULL);
}

void
shell_util_touch_file_async (GFile               *file,
                             GAsyncReadyCallback  callback,
                             gpointer             user_data)
{
  g_autoptr (GTask) task = NULL;

  g_return_if_fail (G_IS_FILE (file));

  task = g_task_new (file, NULL, callback, user_data);
  g_task_set_source_tag (task, shell_util_touch_file_async);

  g_task_run_in_thread (task, touch_file);
}

gboolean
shell_util_touch_file_finish (GFile         *file,
                              GAsyncResult  *res,
                              GError       **error)
{
  g_return_val_if_fail (G_IS_FILE (file), FALSE);
  g_return_val_if_fail (G_IS_TASK (res), FALSE);

  return g_task_propagate_boolean (G_TASK (res), error);
}

/**
 * shell_util_wifexited:
 * @status: the status returned by wait() or waitpid()
 * @exit: (out): the actual exit status of the process
 *
 * Implements libc standard WIFEXITED, that cannot be used JS
 * code.
 * Returns: TRUE if the process exited normally, FALSE otherwise
 */
gboolean
shell_util_wifexited (int  status,
                      int *exit)
{
  gboolean ret;

  ret = WIFEXITED(status);

  if (ret)
    *exit = WEXITSTATUS(status);

  return ret;
}

/**
 * shell_util_create_pixbuf_from_data:
 * @data: (array length=len) (element-type guint8) (transfer full):
 * @len:
 * @colorspace:
 * @has_alpha:
 * @bits_per_sample:
 * @width:
 * @height:
 * @rowstride:
 *
 * Workaround for non-introspectability of gdk_pixbuf_from_data().
 *
 * Returns: (transfer full):
 */
GdkPixbuf *
shell_util_create_pixbuf_from_data (const guchar      *data,
                                    gsize              len,
                                    GdkColorspace      colorspace,
                                    gboolean           has_alpha,
                                    int                bits_per_sample,
                                    int                width,
                                    int                height,
                                    int                rowstride)
{
  return gdk_pixbuf_new_from_data (data, colorspace, has_alpha,
                                   bits_per_sample, width, height, rowstride,
                                   (GdkPixbufDestroyNotify) g_free, NULL);
}

typedef const gchar *(*ShellGLGetString) (GLenum);

static gboolean
canvas_draw_cb (ClutterContent *content,
                cairo_t        *cr,
                gint            width,
                gint            height,
                gpointer        user_data)
{
  cairo_surface_t *surface = user_data;

  cairo_set_source_surface (cr, surface, 0, 0);
  cairo_paint (cr);

  return FALSE;
}

/**
 * shell_util_get_content_for_window_actor:
 * @window_actor: a #MetaWindowActor
 * @window_rect: a #MetaRectangle
 *
 * Returns: (transfer full) (nullable): a new #ClutterContent
 */
ClutterContent *
shell_util_get_content_for_window_actor (MetaWindowActor *window_actor,
                                         MetaRectangle   *window_rect)
{
  ClutterContent *content;
  cairo_surface_t *surface;
  cairo_rectangle_int_t clip;
  gfloat actor_x, actor_y;

  clutter_actor_get_position (CLUTTER_ACTOR (window_actor), &actor_x, &actor_y);

  clip.x = window_rect->x - (gint) actor_x;
  clip.y = window_rect->y - (gint) actor_y;
  clip.width = window_rect->width;
  clip.height = window_rect->height;

  surface = meta_window_actor_get_image (window_actor, &clip);

  if (!surface)
    return NULL;

  content = clutter_canvas_new ();
  clutter_canvas_set_size (CLUTTER_CANVAS (content),
                           cairo_image_surface_get_width (surface),
                           cairo_image_surface_get_height (surface));
  g_signal_connect (content, "draw",
                    G_CALLBACK (canvas_draw_cb), surface);
  clutter_content_invalidate (content);
  cairo_surface_destroy (surface);

  return content;
}

cairo_surface_t *
shell_util_composite_capture_images (ClutterCapture  *captures,
                                     int              n_captures,
                                     int              x,
                                     int              y,
                                     int              target_width,
                                     int              target_height,
                                     float            target_scale)
{
  int i;
  cairo_format_t format;
  cairo_surface_t *image;
  cairo_t *cr;

  g_assert (n_captures > 0);
  g_assert (target_scale > 0.0f);

  format = cairo_image_surface_get_format (captures[0].image);
  image = cairo_image_surface_create (format, target_width, target_height);
  cairo_surface_set_device_scale (image, target_scale, target_scale);

  cr = cairo_create (image);

  for (i = 0; i < n_captures; i++)
    {
      ClutterCapture *capture = &captures[i];

      cairo_save (cr);

      cairo_translate (cr,
                       capture->rect.x - x,
                       capture->rect.y - y);
      cairo_set_source_surface (cr, capture->image, 0, 0);
      cairo_paint (cr);

      cairo_restore (cr);
    }
  cairo_destroy (cr);

  return image;
}

#ifndef HAVE_FDWALK
static int
fdwalk (int  (*cb)(void *data, int fd),
        void  *data)
{
  gint open_max;
  gint fd;
  gint res = 0;

#ifdef HAVE_SYS_RESOURCE_H
  struct rlimit rl;
#endif

#ifdef __linux__
  DIR *d;

  if ((d = opendir("/proc/self/fd")))
    {
      struct dirent *de;

      while ((de = readdir(d)))
        {
          glong l;
          gchar *e = NULL;

          if (de->d_name[0] == '.')
            continue;

          errno = 0;
          l = strtol(de->d_name, &e, 10);
          if (errno != 0 || !e || *e)
            continue;

          fd = (gint) l;

          if ((glong) fd != l)
            continue;

          if (fd == dirfd(d))
            continue;

          if ((res = cb (data, fd)) != 0)
            break;
        }

      closedir(d);
      return res;
  }

  /* If /proc is not mounted or not accessible we fall back to the old
   * rlimit trick */

#endif

#ifdef HAVE_SYS_RESOURCE_H
  if (getrlimit (RLIMIT_NOFILE, &rl) == 0 && rl.rlim_max != RLIM_INFINITY)
    open_max = rl.rlim_max;
  else
#endif
    open_max = sysconf (_SC_OPEN_MAX);

  for (fd = 0; fd < open_max; fd++)
    if ((res = cb (data, fd)) != 0)
      break;

  return res;
}
#endif

static int
check_cloexec (void *data,
               gint  fd)
{
  int r;

  if (fd < 3)
    return 0;

  r = fcntl (fd, F_GETFD);
  if (r < 0)
    return 0;

  if (!(r & FD_CLOEXEC))
    g_warning ("fd %d is not CLOEXEC", fd);

  return 0;
}

/**
 * shell_util_check_cloexec_fds:
 *
 * Walk over all open file descriptors. Check them for the FD_CLOEXEC flag.
 * If this flag is not set, log the offending file descriptor number.
 *
 * It is important that gnome-shell's file descriptors are all marked CLOEXEC,
 * so that the shell's open file descriptors are not passed to child processes
 * that we launch.
 */
void
shell_util_check_cloexec_fds (void)
{
  fdwalk (check_cloexec, NULL);
  g_info ("Open fd CLOEXEC check complete");
}

/**
 * shell_util_get_uid:
 *
 * A wrapper around getuid() so that it can be used from JavaScript. This
 * function will always succeed.
 *
 * Returns: the real user ID of the calling process
 */
gint
shell_util_get_uid (void)
{
  return getuid ();
}

typedef struct {
  GDBusConnection *connection;
  gchar           *command;

  GCancellable *cancellable;
  gulong        cancel_id;

  guint    job_watch;
  gchar   *job;
} SystemdCall;

static void
shell_util_systemd_call_data_free (SystemdCall *data)
{
  if (data->job_watch)
    {
      g_dbus_connection_signal_unsubscribe (data->connection, data->job_watch);
      data->job_watch = 0;
    }

  if (data->cancellable)
    {
      g_cancellable_disconnect (data->cancellable, data->cancel_id);
      g_clear_object (&data->cancellable);
      data->cancel_id = 0;
    }

  g_clear_object (&data->connection);
  g_clear_pointer (&data->job, g_free);
  g_clear_pointer (&data->command, g_free);
  g_free (data);
}

static void
shell_util_systemd_call_cancelled_cb (GCancellable *cancellable,
                                      GTask        *task)
{
  SystemdCall *data = g_task_get_task_data (task);

  /* Task has returned, but data is not yet free'ed, ignore signal. */
  if (g_task_get_completed (task))
    return;

  /* We are still in the DBus call; it will return the error. */
  if (data->job == NULL)
    return;

  g_task_return_error_if_cancelled (task);
  g_object_unref (task);
}

static void
on_systemd_call_cb (GObject      *source,
                    GAsyncResult *res,
                    gpointer      user_data)
{
  g_autoptr (GVariant) reply = NULL;
  g_autoptr (GError) error = NULL;
  GTask *task = G_TASK (user_data);
  SystemdCall *data;

  reply = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source),
                                         res, &error);

  data = g_task_get_task_data (task);

  if (error) {
    g_warning ("Could not issue '%s' systemd call", data->command);
    g_task_return_error (task, g_steal_pointer (&error));
    g_object_unref (task);

    return;
  }

  g_assert (data->job == NULL);
  g_variant_get (reply, "(o)", &data->job);

  /* And we wait for the JobRemoved notification. */
}

static void
on_systemd_job_removed_cb (GDBusConnection *connection,
                           const gchar *sender_name,
                           const gchar *object_path,
                           const gchar *interface_name,
                           const gchar *signal_name,
                           GVariant *parameters,
                           gpointer user_data)
{
  GTask *task = G_TASK (user_data);
  SystemdCall *data;
  guint32 id;
  const char *path, *unit, *result;

  /* Task has returned, but data is not yet free'ed, ignore signal. */
  if (g_task_get_completed (task))
    return;

  data = g_task_get_task_data (task);

  /* No job information yet, ignore. */
  if (data->job == NULL)
    return;

  g_variant_get (parameters, "(u&o&s&s)", &id, &path, &unit, &result);

  /* Is it the job we are waiting for? */
  if (g_strcmp0 (path, data->job) != 0)
    return;

  /* Task has completed; return the result of the job */
  if (g_strcmp0 (result, "done") == 0)
    g_task_return_boolean (task, TRUE);
  else
    g_task_return_new_error (task,
                             G_IO_ERROR,
                             G_IO_ERROR_FAILED,
                             "Systemd job completed with status \"%s\"",
                             result);

  g_object_unref (task);
}

static void
shell_util_systemd_call (const char           *command,
                         const char           *unit,
                         const char           *mode,
                         GCancellable         *cancellable,
                         GAsyncReadyCallback   callback,
                         gpointer              user_data)
{
  g_autoptr (GTask) task = g_task_new (NULL, cancellable, callback, user_data);

#ifdef HAVE_SYSTEMD
  g_autoptr (GDBusConnection) connection = NULL;
  GError *error = NULL;
  SystemdCall *data;
  g_autofree char *self_unit = NULL;
  int res;

  connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);

  if (connection == NULL) {
    g_task_return_error (task, error);
    return;
  }

  /* We look up the systemd unit that our own process is running in here.
   * This way we determine whether the session is managed using systemd.
   */
  res = sd_pid_get_user_unit (getpid (), &self_unit);

  if (res == -ENODATA)
    {
      g_task_return_new_error (task,
                               G_IO_ERROR,
                               G_IO_ERROR_NOT_SUPPORTED,
                               "Not systemd managed");
      return;
    }
  else if (res < 0)
    {
      g_task_return_new_error (task,
                               G_IO_ERROR,
                               g_io_error_from_errno (-res),
                               "Error fetching own systemd unit: %s",
                               g_strerror (-res));
      return;
    }

  data = g_new0 (SystemdCall, 1);
  data->command = g_strdup (command);
  data->connection = g_object_ref (connection);
  data->job_watch = g_dbus_connection_signal_subscribe (connection,
                                                        "org.freedesktop.systemd1",
                                                        "org.freedesktop.systemd1.Manager",
                                                        "JobRemoved",
                                                        "/org/freedesktop/systemd1",
                                                        NULL,
                                                        G_DBUS_SIGNAL_FLAGS_NONE,
                                                        on_systemd_job_removed_cb,
                                                        task,
                                                        NULL);
  g_task_set_task_data (task,
                        data,
                        (GDestroyNotify) shell_util_systemd_call_data_free);

  if (cancellable)
    {
      data->cancellable = g_object_ref (cancellable);
      data->cancel_id = g_cancellable_connect (cancellable,
                                               G_CALLBACK (shell_util_systemd_call_cancelled_cb),
                                               task,
                                               NULL);
    }

  g_dbus_connection_call (connection,
                          "org.freedesktop.systemd1",
                          "/org/freedesktop/systemd1",
                          "org.freedesktop.systemd1.Manager",
                          command,
                          g_variant_new ("(ss)",
                                         unit, mode),
                          G_VARIANT_TYPE ("(o)"),
                          G_DBUS_CALL_FLAGS_NONE,
                          -1, cancellable,
                          on_systemd_call_cb,
                          g_steal_pointer (&task));
#else /* HAVE_SYSTEMD */
  g_task_return_new_error (task,
                           G_IO_ERROR,
                           G_IO_ERROR_NOT_SUPPORTED,
                           "systemd not supported by gnome-shell");
#endif /* !HAVE_SYSTEMD */
}

void
shell_util_start_systemd_unit (const char           *unit,
                               const char           *mode,
                               GCancellable         *cancellable,
                               GAsyncReadyCallback   callback,
                               gpointer              user_data)
{
  shell_util_systemd_call ("StartUnit", unit, mode,
                           cancellable, callback, user_data);
}

gboolean
shell_util_start_systemd_unit_finish (GAsyncResult  *res,
                                      GError       **error)
{
  return g_task_propagate_boolean (G_TASK (res), error);
}

void
shell_util_stop_systemd_unit (const char           *unit,
                              const char           *mode,
                              GCancellable         *cancellable,
                              GAsyncReadyCallback   callback,
                              gpointer              user_data)
{
  shell_util_systemd_call ("StopUnit", unit, mode,
                           cancellable, callback, user_data);
}

gboolean
shell_util_stop_systemd_unit_finish (GAsyncResult  *res,
                                     GError       **error)
{
  return g_task_propagate_boolean (G_TASK (res), error);
}

void
shell_util_sd_notify (void)
{
  /* We only use NOTIFY_SOCKET exactly once; unset it so it doesn't remain in
   * our environment. */
  sd_notify (1, "READY=1");
}

/**
 * shell_util_has_x11_display_extension:
 * @display: A #MetaDisplay
 * @extension: An X11 extension
 *
 * If the corresponding X11 display provides the passed extension, return %TRUE,
 * otherwise %FALSE. If there is no X11 display, %FALSE is passed.
 */
gboolean
shell_util_has_x11_display_extension (MetaDisplay *display,
                                      const char  *extension)
{
  MetaX11Display *x11_display;
  Display *xdisplay;
  int op, event, error;

  x11_display = meta_display_get_x11_display (display);
  if (!x11_display)
    return FALSE;

  xdisplay = meta_x11_display_get_xdisplay (x11_display);
  return XQueryExtension (xdisplay, extension, &op, &event, &error);
}

/**
 * shell_util_get_translated_folder_name:
 * @name: the untranslated folder name
 *
 * Attempts to translate the folder @name using translations provided
 * by .directory files.
 *
 * Returns: (nullable): a translated string or %NULL
 */
char *
shell_util_get_translated_folder_name (const char *name)
{
  return shell_app_cache_translate_folder (shell_app_cache_get_default (), name);
}