Newer
Older
/* pressure-vessel-wrap — run a program in a container that protects $HOME,
* optionally using a Flatpak-style runtime.
*
* Contains code taken from Flatpak.
*
* Copyright © 2014-2019 Red Hat, Inc
* Copyright © 2017-2019 Collabora Ltd.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This program 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.
*
* This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "subprojects/libglnx/config.h"
#include <glib.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#include <X11/Xauth.h>
#include <ftw.h>
#include <stdlib.h>
#include <sys/utsname.h>
#include "libglnx.h"
#include "glib-backports.h"
#include "flatpak-bwrap-private.h"
#include "flatpak-utils-private.h"
/*
* Supported Debian-style multiarch tuples
*/
static const char * const multiarch_tuples[] =
{
"x86_64-linux-gnu",
"i386-linux-gnu"
};
/*
* Directories other than /usr/lib that we must search for loadable
* modules, in the same order as multiarch_tuples
*/
static const char * const libquals[] =
{
"lib64",
"lib32"
};
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
/* In Flatpak this is optional, in pressure-vessel not so much */
#define ENABLE_XAUTH
static gchar *
find_executable_dir (GError **error)
{
g_autofree gchar *target = glnx_readlinkat_malloc (-1, "/proc/self/exe",
NULL, error);
if (target == NULL)
return glnx_prefix_error_null (error, "Unable to resolve /proc/self/exe");
return g_path_get_dirname (target);
}
static void
search_path_append (GString *search_path,
const gchar *item)
{
if (search_path->len != 0)
g_string_append (search_path, ":");
g_string_append (search_path, item);
}
static gchar *
find_bwrap (const char *tools_dir)
{
static const char * const flatpak_libexecdirs[] =
{
"/usr/local/libexec",
"/usr/libexec",
"/usr/lib/flatpak"
};
const char *tmp;
g_autofree gchar *candidate = NULL;
g_autofree gchar *dirname = NULL;
gsize i;
g_return_val_if_fail (tools_dir != NULL, NULL);
tmp = g_getenv ("BWRAP");
if (tmp != NULL)
return g_strdup (tmp);
candidate = g_find_program_in_path ("bwrap");
if (candidate != NULL)
return g_steal_pointer (&candidate);
for (i = 0; i < G_N_ELEMENTS (flatpak_libexecdirs); i++)
{
candidate = g_build_filename (flatpak_libexecdirs[i],
"flatpak-bwrap", NULL);
if (g_file_test (candidate, G_FILE_TEST_IS_EXECUTABLE))
return g_steal_pointer (&candidate);
else
g_clear_pointer (&candidate, g_free);
}
candidate = g_build_filename (tools_dir, "bwrap", NULL);
if (g_file_test (candidate, G_FILE_TEST_IS_EXECUTABLE))
return g_steal_pointer (&candidate);
else
g_clear_pointer (&candidate, g_free);
return NULL;
}
static gchar *
check_bwrap (const char *tools_dir)
{
g_autoptr(GError) local_error = NULL;
GError **error = &local_error;
g_autofree gchar *bwrap_executable = find_bwrap (tools_dir);
const char *bwrap_test_argv[] =
{
NULL,
"--bind", "/", "/",
"true",
NULL
};
g_return_val_if_fail (tools_dir != NULL, NULL);
if (bwrap_executable == NULL)
{
g_warning ("Cannot find bwrap");
}
else
{
int exit_status;
g_autofree gchar *child_stdout = NULL;
g_autofree gchar *child_stderr = NULL;
bwrap_test_argv[0] = bwrap_executable;
if (!g_spawn_sync (NULL, /* cwd */
(gchar **) bwrap_test_argv,
NULL, /* environ */
G_SPAWN_DEFAULT,
NULL, NULL, /* child setup */
&child_stdout,
&child_stderr,
&exit_status,
error))
{
g_warning ("Cannot run bwrap: %s", local_error->message);
g_clear_error (&local_error);
}
else if (exit_status != 0)
{
g_warning ("Cannot run bwrap: exit status %d", exit_status);
if (child_stdout != NULL && child_stdout[0] != '\0')
g_warning ("Output:\n%s", child_stdout);
if (child_stderr != NULL && child_stderr[0] != '\0')
g_warning ("Diagnostic output:\n%s", child_stderr);
}
else
{
return g_steal_pointer (&bwrap_executable);
}
}
return NULL;
}
static gboolean
bind_usr (FlatpakBwrap *bwrap,
const char *host_path,
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
const char *mount_point,
GError **error)
{
g_autofree gchar *usr = NULL;
g_autofree gchar *dest = NULL;
gboolean host_path_is_usr = FALSE;
g_autoptr(GDir) dir = NULL;
const gchar *member = NULL;
static const char * const bind_etc[] =
{
"alternatives",
"ld.so.cache"
};
gsize i;
g_return_val_if_fail (host_path != NULL, FALSE);
g_return_val_if_fail (host_path[0] == '/', FALSE);
g_return_val_if_fail (mount_point != NULL, FALSE);
g_return_val_if_fail (mount_point[0] == '/', FALSE);
usr = g_build_filename (host_path, "usr", NULL);
dest = g_build_filename (mount_point, "usr", NULL);
if (g_file_test (usr, G_FILE_TEST_IS_DIR))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", usr, dest,
NULL);
}
else
{
/* host_path is assumed to be a merged /usr */
host_path_is_usr = TRUE;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", host_path, dest,
NULL);
}
g_clear_pointer (&dest, g_free);
dir = g_dir_open (host_path, 0, error);
if (dir == NULL)
return FALSE;
for (member = g_dir_read_name (dir);
member != NULL;
member = g_dir_read_name (dir))
{
if (g_str_has_prefix (member, "lib")
|| g_str_equal (member, "bin")
|| g_str_equal (member, "sbin"))
{
dest = g_build_filename (mount_point, member, NULL);
if (host_path_is_usr)
{
g_autofree gchar *target = g_build_filename ("usr",
member, NULL);
flatpak_bwrap_add_args (bwrap,
"--symlink", target, dest,
NULL);
}
else
{
g_autofree gchar *path = g_build_filename (host_path,
member, NULL);
g_autofree gchar *target = glnx_readlinkat_malloc (-1, path, NULL, NULL);
if (target != NULL)
{
flatpak_bwrap_add_args (bwrap,
"--symlink", target, dest,
NULL);
}
else
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", path, dest,
NULL);
}
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
}
g_clear_pointer (&dest, g_free);
}
}
for (i = 0; i < G_N_ELEMENTS (bind_etc); i++)
{
g_autofree gchar *path = g_build_filename (host_path, "etc",
bind_etc[i], NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
dest = g_build_filename (mount_point, "etc", bind_etc[i], NULL);
flatpak_bwrap_add_args (bwrap,
"--ro-bind", path, dest,
NULL);
g_clear_pointer (&dest, g_free);
}
}
return TRUE;
}
/* From Flatpak */
static char *
extract_unix_path_from_dbus_address (const char *address)
{
const char *path, *path_end;
if (address == NULL)
return NULL;
if (!g_str_has_prefix (address, "unix:"))
return NULL;
path = strstr (address, "path=");
if (path == NULL)
return NULL;
path += strlen ("path=");
path_end = path;
while (*path_end != 0 && *path_end != ',')
path_end++;
return g_strndup (path, path_end - path);
}
/* From Flatpak */
#ifdef ENABLE_XAUTH
static gboolean
auth_streq (char *str,
char *au_str,
int au_len)
{
return au_len == strlen (str) && memcmp (str, au_str, au_len) == 0;
}
static gboolean
xauth_entry_should_propagate (Xauth *xa,
char *hostname,
char *number)
{
/* ensure entry isn't for remote access */
if (xa->family != FamilyLocal && xa->family != FamilyWild)
return FALSE;
/* ensure entry is for this machine */
if (xa->family == FamilyLocal && !auth_streq (hostname, xa->address, xa->address_length))
return FALSE;
/* ensure entry is for this session */
if (xa->number != NULL && !auth_streq (number, xa->number, xa->number_length))
return FALSE;
return TRUE;
}
static void
write_xauth (char *number, FILE *output)
{
Xauth *xa, local_xa;
char *filename;
FILE *f;
struct utsname unames;
if (uname (&unames))
{
g_warning ("uname failed");
return;
}
filename = XauFileName ();
f = fopen (filename, "rb");
if (f == NULL)
return;
while (TRUE)
{
xa = XauReadAuth (f);
if (xa == NULL)
break;
if (xauth_entry_should_propagate (xa, unames.nodename, number))
{
local_xa = *xa;
if (local_xa.number)
{
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
local_xa.number_length = 2;
}
if (!XauWriteAuth (output, &local_xa))
g_warning ("xauth write error");
}
XauDisposeAuth (xa);
}
fclose (f);
}
#endif
/* Adapted from Flatpak */
static void
flatpak_run_add_x11_args (FlatpakBwrap *bwrap,
gboolean allowed)
{
g_autofree char *x11_socket = NULL;
const char *display;
/* Always cover /tmp/.X11-unix, that way we never see the host one in case
* we have access to the host /tmp. If you request X access we'll put the right
* thing in this anyway.
*/
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/tmp/.X11-unix",
NULL);
if (!allowed)
{
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
return;
}
g_debug ("Allowing x11 access");
display = g_getenv ("DISPLAY");
if (display && display[0] == ':' && g_ascii_isdigit (display[1]))
{
const char *display_nr = &display[1];
const char *display_nr_end = display_nr;
g_autofree char *d = NULL;
while (g_ascii_isdigit (*display_nr_end))
display_nr_end++;
d = g_strndup (display_nr, display_nr_end - display_nr);
x11_socket = g_strdup_printf ("/tmp/.X11-unix/X%s", d);
flatpak_bwrap_add_args (bwrap,
"--ro-bind", x11_socket, "/tmp/.X11-unix/X99",
NULL);
flatpak_bwrap_set_env (bwrap, "DISPLAY", ":99.0", TRUE);
#ifdef ENABLE_XAUTH
g_auto(GLnxTmpfile) xauth_tmpf = { 0, };
if (glnx_open_anonymous_tmpfile (O_RDWR | O_CLOEXEC, &xauth_tmpf, NULL))
{
FILE *output = fdopen (xauth_tmpf.fd, "wb");
if (output != NULL)
{
/* fd is now owned by output, steal it from the tmpfile */
int tmp_fd = dup (glnx_steal_fd (&xauth_tmpf.fd));
if (tmp_fd != -1)
{
g_autofree char *dest = g_strdup_printf ("/run/user/%d/Xauthority", getuid ());
write_xauth (d, output);
flatpak_bwrap_add_args_data_fd (bwrap, "--ro-bind-data", tmp_fd, dest);
flatpak_bwrap_set_env (bwrap, "XAUTHORITY", dest, TRUE);
}
fclose (output);
if (tmp_fd != -1)
lseek (tmp_fd, 0, SEEK_SET);
}
}
#endif
}
else
{
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
}
}
static gboolean
flatpak_run_add_wayland_args (FlatpakBwrap *bwrap)
{
const char *wayland_display;
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
g_autofree char *wayland_socket = NULL;
g_autofree char *sandbox_wayland_socket = NULL;
gboolean res = FALSE;
struct stat statbuf;
wayland_display = g_getenv ("WAYLAND_DISPLAY");
if (!wayland_display)
wayland_display = "wayland-0";
wayland_socket = g_build_filename (user_runtime_dir, wayland_display, NULL);
sandbox_wayland_socket = g_strdup_printf ("/run/user/%d/%s", getuid (), wayland_display);
if (stat (wayland_socket, &statbuf) == 0 &&
(statbuf.st_mode & S_IFMT) == S_IFSOCK)
{
res = TRUE;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", wayland_socket, sandbox_wayland_socket,
NULL);
}
return res;
}
/* Try to find a default server from a pulseaudio confguration file */
static char *
flatpak_run_get_pulseaudio_server_user_config (const char *path)
{
g_autoptr(GFile) file = g_file_new_for_path (path);
g_autoptr(GError) my_error = NULL;
g_autoptr(GFileInputStream) input_stream = NULL;
g_autoptr(GDataInputStream) data_stream = NULL;
size_t len;
input_stream = g_file_read (file, NULL, &my_error);
if (my_error)
{
g_debug ("Pulseaudio user configuration file '%s': %s", path, my_error->message);
return NULL;
}
data_stream = g_data_input_stream_new (G_INPUT_STREAM (input_stream));
while (TRUE)
{
g_autofree char *line = g_data_input_stream_read_line (data_stream, &len, NULL, NULL);
if (line == NULL)
break;
g_strchug (line);
if ((*line == '\0') || (*line == ';') || (*line == '#'))
continue;
if (g_str_has_prefix (line, ".include "))
{
g_autofree char *rec_path = g_strdup (line + 9);
g_strstrip (rec_path);
char *found = flatpak_run_get_pulseaudio_server_user_config (rec_path);
if (found)
return found;
}
else if (g_str_has_prefix (line, "["))
{
return NULL;
}
else
{
g_auto(GStrv) tokens = g_strsplit (line, "=", 2);
if ((tokens[0] != NULL) && (tokens[1] != NULL))
{
g_strchomp (tokens[0]);
if (strcmp ("default-server", tokens[0]) == 0)
{
g_strstrip (tokens[1]);
g_debug ("Found pulseaudio socket from configuration file '%s': %s", path, tokens[1]);
return g_strdup (tokens[1]);
}
}
}
}
return NULL;
}
static char *
flatpak_run_get_pulseaudio_server (void)
{
const char * pulse_clientconfig;
char *pulse_server;
g_autofree char *pulse_user_config = NULL;
pulse_server = g_strdup (g_getenv ("PULSE_SERVER"));
if (pulse_server)
return pulse_server;
pulse_clientconfig = g_getenv ("PULSE_CLIENTCONFIG");
if (pulse_clientconfig)
return flatpak_run_get_pulseaudio_server_user_config (pulse_clientconfig);
pulse_user_config = g_build_filename (g_get_user_config_dir (), "pulse/client.conf", NULL);
pulse_server = flatpak_run_get_pulseaudio_server_user_config (pulse_user_config);
if (pulse_server)
return pulse_server;
pulse_server = flatpak_run_get_pulseaudio_server_user_config ("/etc/pulse/client.conf");
if (pulse_server)
return pulse_server;
return NULL;
}
static char *
flatpak_run_parse_pulse_server (const char *value)
{
g_auto(GStrv) servers = g_strsplit (value, " ", 0);
gsize i;
for (i = 0; servers[i] != NULL; i++)
{
const char *server = servers[i];
if (g_str_has_prefix (server, "{"))
{
const char * closing = strstr (server, "}");
if (closing == NULL)
continue;
server = closing + 1;
}
if (g_str_has_prefix (server, "unix:"))
return g_strdup (server + 5);
}
return NULL;
}
static void
flatpak_run_add_pulseaudio_args (FlatpakBwrap *bwrap)
{
g_autofree char *pulseaudio_server = flatpak_run_get_pulseaudio_server ();
g_autofree char *pulseaudio_socket = NULL;
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
if (pulseaudio_server)
pulseaudio_socket = flatpak_run_parse_pulse_server (pulseaudio_server);
if (!pulseaudio_socket)
pulseaudio_socket = g_build_filename (user_runtime_dir, "pulse/native", NULL);
flatpak_bwrap_unset_env (bwrap, "PULSE_SERVER");
/* SteamOS system-wide PulseAudio instance */
if (!g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
{
g_clear_pointer (&pulseaudio_socket, g_free);
pulseaudio_socket = g_strdup ("/var/run/pulse/native");
}
if (g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
{
gboolean share_shm = FALSE; /* TODO: When do we add this? */
g_autofree char *client_config = g_strdup_printf ("enable-shm=%s\n", share_shm ? "yes" : "no");
g_autofree char *sandbox_socket_path = g_strdup_printf ("/run/user/%d/pulse/native", getuid ());
g_autofree char *pulse_server = g_strdup_printf ("unix:/run/user/%d/pulse/native", getuid ());
g_autofree char *config_path = g_strdup_printf ("/run/user/%d/pulse/config", getuid ());
/* FIXME - error handling */
if (!flatpak_bwrap_add_args_data (bwrap, "pulseaudio", client_config, -1, config_path, NULL))
return;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", pulseaudio_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (bwrap, "PULSE_SERVER", pulse_server, TRUE);
flatpak_bwrap_set_env (bwrap, "PULSE_CLIENTCONFIG", config_path, TRUE);
}
else
g_debug ("Could not find pulseaudio socket");
}
/* Simplified from Flatpak: we never restrict access to the D-Bus system bus */
static gboolean
flatpak_run_add_system_dbus_args (FlatpakBwrap *app_bwrap)
{
const char *dbus_address = g_getenv ("DBUS_SYSTEM_BUS_ADDRESS");
g_autofree char *real_dbus_address = NULL;
g_autofree char *dbus_system_socket = NULL;
if (dbus_address != NULL)
dbus_system_socket = extract_unix_path_from_dbus_address (dbus_address);
else if (g_file_test ("/var/run/dbus/system_bus_socket", G_FILE_TEST_EXISTS))
dbus_system_socket = g_strdup ("/var/run/dbus/system_bus_socket");
if (dbus_system_socket != NULL)
{
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", dbus_system_socket, "/run/dbus/system_bus_socket",
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SYSTEM_BUS_ADDRESS", "unix:path=/run/dbus/system_bus_socket", TRUE);
return TRUE;
}
return FALSE;
}
/* Simplified from Flatpak: we never restrict access to the D-Bus session bus */
static gboolean
flatpak_run_add_session_dbus_args (FlatpakBwrap *app_bwrap)
{
const char *dbus_address = g_getenv ("DBUS_SESSION_BUS_ADDRESS");
char *dbus_session_socket = NULL;
g_autofree char *sandbox_socket_path = g_strdup_printf ("/run/user/%d/bus", getuid ());
g_autofree char *sandbox_dbus_address = g_strdup_printf ("unix:path=/run/user/%d/bus", getuid ());
g_autofree char *user_runtime_dir = flatpak_get_real_xdg_runtime_dir ();
/* FIXME: upstream the use of user_runtime_dir to Flatpak */
if (dbus_address != NULL)
{
dbus_session_socket = extract_unix_path_from_dbus_address (dbus_address);
}
else
{
struct stat statbuf;
dbus_session_socket = g_build_filename (user_runtime_dir, "bus", NULL);
if (stat (dbus_session_socket, &statbuf) < 0
|| (statbuf.st_mode & S_IFMT) != S_IFSOCK
|| statbuf.st_uid != getuid ())
return FALSE;
}
if (dbus_session_socket != NULL)
{
flatpak_bwrap_add_args (app_bwrap,
"--ro-bind", dbus_session_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (app_bwrap, "DBUS_SESSION_BUS_ADDRESS", sandbox_dbus_address, TRUE);
return TRUE;
}
return FALSE;
}
static gchar *
capture_output (const char * const * argv,
GError **error)
{
gsize len;
gint exit_status;
g_autofree gchar *output = NULL;
g_autofree gchar *errors = NULL;
gsize i;
g_autoptr(GString) command = g_string_new ("");
for (i = 0; argv[i] != NULL; i++)
{
g_autofree gchar *quoted = g_shell_quote (argv[i]);
g_string_append_printf (command, " %s", quoted);
}
g_debug ("run:%s", command->str);
if (!g_spawn_sync (NULL, /* cwd */
(char **) argv,
NULL, /* env */
G_SPAWN_SEARCH_PATH,
NULL, NULL, /* child setup */
&output,
&errors,
&exit_status,
error))
return NULL;
g_printerr ("%s", errors);
if (!g_spawn_check_exit_status (exit_status, error))
return NULL;
len = strlen (output);
/* Emulate shell $() */
if (len > 0 && output[len - 1] == '\n')
output[len - 1] = '\0';
g_debug ("-> %s", output);
return g_steal_pointer (&output);
}
static gboolean
run_bwrap (FlatpakBwrap *bwrap,
GError **error)
{
gint exit_status;
g_autofree gchar *output = NULL;
g_autofree gchar *errors = NULL;
guint i;
g_autoptr(GString) command = g_string_new ("");
for (i = 0; i < bwrap->argv->len; i++)
{
g_autofree gchar *quoted = NULL;
char *unquoted = g_ptr_array_index (bwrap->argv, i);
if (unquoted == NULL)
break;
quoted = g_shell_quote (unquoted);
g_string_append_printf (command, " %s", quoted);
}
g_debug ("run:%s", command->str);
if (!g_spawn_sync (NULL, /* cwd */
(char **) bwrap->argv->pdata,
NULL, /* env */
G_SPAWN_SEARCH_PATH,
NULL, NULL, /* child setup */
&output,
&errors,
&exit_status,
error))
return FALSE;
g_print ("%s", output);
g_printerr ("%s", errors);
if (!g_spawn_check_exit_status (exit_status, error))
return FALSE;
return TRUE;
}
static gboolean
try_bind_dri (FlatpakBwrap *bwrap,
FlatpakBwrap *mount_runtime_on_scratch,
const char *overrides,
const char *scratch,
const char *tool_path,
const char *libdir,
const char *libdir_on_host,
GError **error)
{
g_autofree gchar *dri = g_build_filename (libdir, "dri", NULL);
g_autofree gchar *s2tc = g_build_filename (libdir, "libtxc_dxtn.so", NULL);
if (g_file_test (dri, G_FILE_TEST_IS_DIR))
{
g_autoptr(FlatpakBwrap) temp_bwrap = NULL;
g_autofree gchar *expr = NULL;
g_autofree gchar *host_dri = NULL;
g_autofree gchar *dest_dri = NULL;
expr = g_strdup_printf ("only-dependencies:if-exists:path-match:%s/dri/*.so",
libdir);
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_append_bwrap (temp_bwrap, mount_runtime_on_scratch);
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
flatpak_bwrap_add_args (temp_bwrap,
tool_path,
"--container", scratch,
"--link-target", "/run/host",
"--dest", libdir_on_host,
"--provider", "/",
expr,
NULL);
flatpak_bwrap_finish (temp_bwrap);
if (!run_bwrap (temp_bwrap, error))
return FALSE;
g_clear_pointer (&temp_bwrap, flatpak_bwrap_free);
host_dri = g_build_filename ("/run/host", libdir, "dri", NULL);
dest_dri = g_build_filename (libdir_on_host, "dri", NULL);
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_args (temp_bwrap,
bwrap->argv->pdata[0],
"--ro-bind", "/", "/",
"--tmpfs", "/run",
"--ro-bind", "/", "/run/host",
"--bind", overrides, overrides,
"sh", "-c",
"ln -fns \"$1\"/* \"$2\"",
"sh", /* $0 */
host_dri,
dest_dri,
NULL);
flatpak_bwrap_finish (temp_bwrap);
if (!run_bwrap (temp_bwrap, error))
return FALSE;
}
if (g_file_test (s2tc, G_FILE_TEST_EXISTS))
{
g_autoptr(FlatpakBwrap) temp_bwrap = NULL;
g_autofree gchar *expr = NULL;
expr = g_strdup_printf ("path-match:%s", s2tc);
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_append_bwrap (temp_bwrap, mount_runtime_on_scratch);
flatpak_bwrap_add_args (temp_bwrap,
tool_path,
"--container", scratch,
"--link-target", "/run/host",
"--dest", libdir_on_host,
"--provider", "/",
expr,
NULL);
flatpak_bwrap_finish (temp_bwrap);
if (!run_bwrap (temp_bwrap, error))
return FALSE;
}
return TRUE;
}
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
/* nftw() doesn't have a user_data argument so we need to use a global
* variable :-( */
static struct
{
FlatpakBwrap *bwrap;
const char *symlink_farm;
const char *dest;
} nftw_data;
static int
add_symlinks_to_bwrap (const char *fpath,
const struct stat *sb,
int typeflag,
struct FTW *ftwbuf)
{
const char *path_in_container;
g_autofree gchar *target = NULL;
gsize prefix_len;
g_return_val_if_fail (g_str_has_prefix (fpath, nftw_data.symlink_farm), 1);
g_return_val_if_fail (g_str_has_suffix (nftw_data.symlink_farm, nftw_data.dest), 1);
prefix_len = strlen (nftw_data.symlink_farm) - strlen (nftw_data.dest);
path_in_container = fpath + prefix_len;
switch (typeflag)
{
case FTW_D:
flatpak_bwrap_add_args (nftw_data.bwrap,
"--dir", path_in_container,
NULL);
break;
case FTW_SL:
target = glnx_readlinkat_malloc (-1, fpath, NULL, NULL);
flatpak_bwrap_add_args (nftw_data.bwrap,
"--symlink", target, path_in_container,
NULL);
break;
default:
g_warning ("Don't know how to handle ftw type flag %d at %s",
typeflag, fpath);
}
return 0;
}
/*
* For every symbolic link in @farm, add a corresponding symbolic link
* via the bwrap command-line.
*/
static void
add_symlink_farm (FlatpakBwrap *bwrap,
const char *farm,
const char *dest)
{
g_return_if_fail (nftw_data.bwrap == NULL);
g_return_if_fail (dest[0] == '/');
g_return_if_fail (g_str_has_suffix (farm, dest));
nftw_data.bwrap = bwrap;
nftw_data.symlink_farm = farm;
nftw_data.dest = dest;
nftw (farm, add_symlinks_to_bwrap, 100, FTW_PHYS);
nftw_data.bwrap = NULL;
nftw_data.symlink_farm = NULL;
nftw_data.dest = NULL;
}
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
static gboolean
bind_runtime (FlatpakBwrap *bwrap,
const char *tools_dir,
const char *runtime,
const char *overrides,
const char *scratch,
GError **error)
{
static const char * const bind_mutable[] =
{
"etc",
"var/cache",
"var/lib"
};
static const char * const dont_bind[] =
{
"/etc/group",
"/etc/passwd",
"/etc/host.conf",
"/etc/hosts",
"/etc/localtime",
"/etc/machine-id",
"/etc/resolv.conf",
"/var/lib/dbus",
"/var/lib/dhcp",
"/var/lib/sudo",
"/var/lib/urandom",
NULL
};
g_autofree gchar *xrd = g_strdup_printf ("/run/user/%ld", (long) geteuid ());
g_autofree gchar *usr = NULL;
gsize i, j;
const gchar *member;
g_autoptr(GString) dri_path = g_string_new ("");
g_return_val_if_fail (tools_dir != NULL, FALSE);
g_return_val_if_fail (runtime != NULL, FALSE);
g_return_val_if_fail (overrides != NULL, FALSE);
g_return_val_if_fail (scratch != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
usr = g_build_filename (runtime, "usr", NULL);
if (!bind_usr (bwrap, runtime, "/", error))
return FALSE;
flatpak_bwrap_add_args (bwrap,
"--setenv", "XDG_RUNTIME_DIR", xrd,
"--proc", "/proc",
"--ro-bind", "/sys", "/sys",
"--tmpfs", "/run",
"--tmpfs", "/tmp",
"--tmpfs", "/var",
"--symlink", "../run", "/var/run",
NULL);
for (i = 0; i < G_N_ELEMENTS (bind_mutable); i++)
{
g_autofree gchar *path = g_build_filename (runtime, bind_mutable[i],
NULL);
g_autoptr(GDir) dir = NULL;
dir = g_dir_open (path, 0, NULL);
if (dir == NULL)
continue;
for (member = g_dir_read_name (dir);
member != NULL;
member = g_dir_read_name (dir))
{
g_autofree gchar *dest = g_build_filename ("/", bind_mutable[i],
member, NULL);
g_autofree gchar *full = NULL;
g_autofree gchar *target = NULL;
if (g_strv_contains (dont_bind, dest))
continue;
full = g_build_filename (runtime, bind_mutable[i], member, NULL);
target = glnx_readlinkat_malloc (-1, full, NULL, NULL);
if (target != NULL)
flatpak_bwrap_add_args (bwrap, "--symlink", target, dest, NULL);
else
flatpak_bwrap_add_args (bwrap, "--ro-bind", full, dest, NULL);
}
}
if (g_file_test ("/etc/machine-id", G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/machine-id", "/etc/machine-id",
"--symlink", "/etc/machine-id",
"/var/lib/dbus/machine-id",
NULL);
}
else if (g_file_test ("/var/lib/dbus/machine-id", G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/var/lib/dbus/machine-id",
"/etc/machine-id",
"--symlink", "/etc/machine-id",
"/var/lib/dbus/machine-id",
NULL);
}
/* /etc/localtime and /etc/resolv.conf can not exist (or be symlinks to
* non-existing targets), in which case we don't want to attempt to create
* bogus symlinks or bind mounts, as that will cause flatpak run to fail.
*/
if (g_file_test ("/etc/localtime", G_FILE_TEST_EXISTS))
{
g_autofree char *localtime = NULL;
gboolean is_reachable = FALSE;
g_autofree char *timezone = flatpak_get_timezone ();
g_autofree char *timezone_content = g_strdup_printf ("%s\n", timezone);
localtime = glnx_readlinkat_malloc (-1, "/etc/localtime", NULL, NULL);
if (localtime != NULL)
{
g_autoptr(GFile) base_file = NULL;
g_autoptr(GFile) target_file = NULL;
g_autofree char *target_canonical = NULL;
base_file = g_file_new_for_path ("/etc");
target_file = g_file_resolve_relative_path (base_file, localtime);
target_canonical = g_file_get_path (target_file);
is_reachable = g_str_has_prefix (target_canonical, "/usr/");
}
if (is_reachable)
{
flatpak_bwrap_add_args (bwrap,
"--symlink", localtime, "/etc/localtime",
NULL);
}
else
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/localtime", "/etc/localtime",
NULL);
}
flatpak_bwrap_add_args_data (bwrap, "timezone",
timezone_content, -1, "/etc/timezone",
NULL);
}
if (g_file_test ("/etc/resolv.conf", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/resolv.conf", "/etc/resolv.conf",
NULL);
if (g_file_test ("/etc/host.conf", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/host.conf", "/etc/host.conf",
NULL);
if (g_file_test ("/etc/hosts", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/hosts", "/etc/hosts",
NULL);
/* TODO: Synthesize a passwd with only the user and nobody,
* like Flatpak does? */
if (g_file_test ("/etc/passwd", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/passwd", "/etc/passwd",
NULL);
if (g_file_test ("/etc/group", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/etc/group", "/etc/group",
NULL);
flatpak_run_add_wayland_args (bwrap);
flatpak_run_add_x11_args (bwrap, TRUE);
flatpak_run_add_pulseaudio_args (bwrap);
flatpak_run_add_session_dbus_args (bwrap);
flatpak_run_add_system_dbus_args (bwrap);
for (i = 0; i < G_N_ELEMENTS (multiarch_tuples); i++)
{
g_autofree gchar *tool = g_strdup_printf ("%s-capsule-capture-libs",
multiarch_tuples[i]);
g_autofree gchar *tool_path = NULL;
g_autofree gchar *ld_so = NULL;
const gchar *argv[] = { NULL, "--print-ld.so", NULL };
g_debug ("Checking for %s libraries...", multiarch_tuples[i]);
tool_path = g_build_filename (tools_dir, tool, NULL);
argv[0] = tool_path;
/* This has the side-effect of testing whether we can run binaries
* for this architecture on the host system. */
ld_so = capture_output (argv, NULL);
if (ld_so != NULL)
{
g_auto(GStrv) dirs = NULL;
g_autoptr(FlatpakBwrap) mount_runtime_on_scratch = NULL;
g_autoptr(FlatpakBwrap) temp_bwrap = NULL;
g_autofree gchar *libdir_in_container = g_build_filename ("/overrides",
"lib",
multiarch_tuples[i],
NULL);
g_autofree gchar *libdir_on_host = g_build_filename (overrides, "lib",
multiarch_tuples[i],
NULL);
g_autofree gchar *this_dri_path_on_host = g_build_filename (libdir_on_host,
"dri", NULL);
g_autofree gchar *this_dri_path_in_container = g_build_filename (libdir_in_container,
"dri", NULL);
g_autofree gchar *libc = NULL;
g_autofree gchar *ld_so_in_runtime = NULL;
const gchar *libqual = NULL;
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_args (temp_bwrap,
bwrap->argv->pdata[0],
NULL);
if (!bind_usr (temp_bwrap, runtime, "/", error))
return FALSE;
flatpak_bwrap_add_args (temp_bwrap,
"readlink", "-e", ld_so,
NULL);
flatpak_bwrap_finish (temp_bwrap);
ld_so_in_runtime = capture_output ((const char * const *) temp_bwrap->argv->pdata,
NULL);
g_clear_pointer (&temp_bwrap, flatpak_bwrap_free);
if (ld_so_in_runtime == NULL)
{
g_debug ("Container does not have %s so it cannot run "
"%s binaries", ld_so, multiarch_tuples[i]);
continue;
}
g_debug ("Container path: %s -> %s", ld_so, ld_so_in_runtime);
search_path_append (dri_path, this_dri_path_in_container);
g_mkdir_with_parents (libdir_on_host, 0755);
g_mkdir_with_parents (this_dri_path_on_host, 0755);
mount_runtime_on_scratch = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_args (mount_runtime_on_scratch,
bwrap->argv->pdata[0],
"--ro-bind", "/", "/",
"--bind", overrides, overrides,
"--tmpfs", scratch,
NULL);
if (!bind_usr (mount_runtime_on_scratch, runtime, scratch,
error))
return FALSE;
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_append_bwrap (temp_bwrap, mount_runtime_on_scratch);
flatpak_bwrap_add_args (temp_bwrap,
tool_path,
"--container", scratch,
"--link-target", "/run/host",
"--dest", libdir_on_host,
"--provider", "/",
"gl:",
NULL);
flatpak_bwrap_finish (temp_bwrap);
if (!run_bwrap (temp_bwrap, error))
return FALSE;
g_clear_pointer (&temp_bwrap, flatpak_bwrap_free);
libc = g_build_filename (libdir_on_host, "libc.so.6", NULL);
/* If we are going to use the host system's libc6 (likely)
* then we have to use its ld.so too. */
if (g_file_test (libc, G_FILE_TEST_IS_SYMLINK))
{
g_autofree gchar *ld_so_in_host = NULL;
g_debug ("Making host ld.so visible in container");
ld_so_in_host = flatpak_canonicalize_filename (ld_so);
g_debug ("Host path: %s -> %s", ld_so, ld_so_in_host);
g_clear_pointer (&temp_bwrap, flatpak_bwrap_free);
temp_bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_args (temp_bwrap,
bwrap->argv->pdata[0],
NULL);
if (!bind_usr (temp_bwrap, runtime, "/", error))
return FALSE;
flatpak_bwrap_add_args (temp_bwrap,
"readlink", "-f", ld_so,
NULL);
flatpak_bwrap_finish (temp_bwrap);
g_debug ("Container path: %s -> %s", ld_so, ld_so_in_runtime);
flatpak_bwrap_add_args (bwrap,
"--ro-bind", ld_so_in_host,
ld_so_in_runtime,
g_debug ("Making host locale data visible in container");
if (g_file_test ("/usr/lib/locale", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/usr/lib/locale",
"/usr/lib/locale",
NULL);
if (g_file_test ("/usr/share/i18n", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/usr/share/i18n",
"/usr/share/i18n",
NULL);
}
/* /lib32 or /lib64 */
libqual = libquals[i];
dirs = g_new0 (gchar *, 7);
dirs[0] = g_build_filename ("/lib", multiarch_tuples[i], NULL);
dirs[1] = g_build_filename ("/usr", "lib", multiarch_tuples[i], NULL);
dirs[2] = g_strdup ("/lib");
dirs[3] = g_strdup ("/usr/lib");
dirs[4] = g_build_filename ("/", libqual, NULL);
dirs[5] = g_build_filename ("/usr", libqual, NULL);
for (j = 0; j < 6; j++)
if (!try_bind_dri (bwrap, mount_runtime_on_scratch,
overrides, scratch, tool_path, dirs[j],
libdir_on_host, error))
return FALSE;
}
}
else
{
g_debug ("Cannot determine ld.so for %s", multiarch_tuples[i]);
}
}
if (dri_path->len != 0)
flatpak_bwrap_add_args (bwrap,
"--setenv", "LIBGL_DRIVERS_PATH", dri_path->str,
NULL);
else
flatpak_bwrap_add_args (bwrap,
"--unsetenv", "LIBGL_DRIVERS_PATH",
NULL);
add_symlink_farm (bwrap, overrides, "/overrides");
if (!bind_usr (bwrap, "/", "/run/host", error))
return FALSE;
return TRUE;
}
/* Order matters here: root, steam and steambeta are or might be symlinks
* to the root of the Steam installation, so we want to bind-mount their
* targets before we deal with the rest. */
static const char * const steam_api_subdirs[] =
{
"root", "steam", "steambeta", "bin", "bin32", "bin64", "sdk32", "sdk64",
};
static gboolean
use_fake_home (FlatpakBwrap *bwrap,
const gchar *fake_home,
GError **error)
{
const gchar *real_home = g_get_home_dir ();
g_autofree gchar *cache = g_build_filename (fake_home, ".cache", NULL);
g_autofree gchar *cache2 = g_build_filename (fake_home, "cache", NULL);
g_autofree gchar *tmp = g_build_filename (cache, "tmp", NULL);
g_autofree gchar *config = g_build_filename (fake_home, ".config", NULL);
g_autofree gchar *config2 = g_build_filename (fake_home, "config", NULL);
g_autofree gchar *local = g_build_filename (fake_home, ".local", NULL);
g_autofree gchar *data = g_build_filename (local, "share", NULL);
g_autofree gchar *data2 = g_build_filename (fake_home, "data", NULL);
g_autofree gchar *steam_pid = NULL;
g_autofree gchar *steam_pipe = NULL;
g_autoptr(GHashTable) mounted = NULL;
gsize i;
g_return_val_if_fail (bwrap != NULL, FALSE);
g_return_val_if_fail (fake_home != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_mkdir_with_parents (fake_home, 0700);
g_mkdir_with_parents (cache, 0700);
g_mkdir_with_parents (tmp, 0700);
g_mkdir_with_parents (config, 0700);
g_mkdir_with_parents (local, 0700);
g_mkdir_with_parents (data, 0700);
if (!g_file_test (cache2, G_FILE_TEST_EXISTS))
{
g_unlink (cache2);
if (symlink (".cache", cache2) != 0)
return glnx_throw_errno_prefix (error,
"Unable to create symlink %s -> .cache",
cache2);
}
if (!g_file_test (config2, G_FILE_TEST_EXISTS))
{
g_unlink (config2);
if (symlink (".config", config2) != 0)
return glnx_throw_errno_prefix (error,
"Unable to create symlink %s -> .config",
config2);
}
if (!g_file_test (data2, G_FILE_TEST_EXISTS))
{
g_unlink (data2);
if (symlink (".local/share", data2) != 0)
return glnx_throw_errno_prefix (error,
"Unable to create symlink %s -> .local/share",
data2);
}
flatpak_bwrap_add_args (bwrap,
"--bind", fake_home, real_home,
"--bind", fake_home, fake_home,
"--bind", tmp, "/var/tmp",
"--setenv", "XDG_CACHE_HOME", cache,
"--setenv", "XDG_CONFIG_HOME", config,
"--setenv", "XDG_DATA_HOME", data,
NULL);
mounted = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, NULL);
/*
* These might be API entry points, according to Steam/steam.sh.
* They're usually symlinks into the Steam root, except for in
* older steam Debian packages that had Debian bug #916303.
*
* TODO: We probably want to hide part or all of root, steam,
* steambeta?
*/
for (i = 0; i < G_N_ELEMENTS (steam_api_subdirs); i++)
{
g_autofree gchar *dir = g_build_filename (real_home, ".steam",
steam_api_subdirs[i], NULL);
g_autofree gchar *mount_point = g_build_filename (fake_home, ".steam",
steam_api_subdirs[i],
NULL);
g_autofree gchar *target = NULL;
target = glnx_readlinkat_malloc (-1, dir, NULL, NULL);
if (target != NULL)
{
/* We used to bind-mount these directories, so transition them
* to symbolic links if we can. */
if (rmdir (mount_point) != 0 && errno != ENOENT && errno != ENOTDIR)
g_debug ("rmdir %s: %s", mount_point, g_strerror (errno));
/* Remove any symlinks that might have already been there. */
if (unlink (mount_point) != 0 && errno != ENOENT)
g_debug ("unlink %s: %s", mount_point, g_strerror (errno));
flatpak_bwrap_add_args (bwrap, "--symlink", target, dir, NULL);
if (strcmp (steam_api_subdirs[i], "root") == 0
|| strcmp (steam_api_subdirs[i], "steam") == 0
|| strcmp (steam_api_subdirs[i], "steambeta") == 0)
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", target, target,
NULL);
g_hash_table_add (mounted, g_steal_pointer (&target));
}
}
else if (!g_hash_table_contains (mounted, dir))
{
flatpak_bwrap_add_args (bwrap, "--ro-bind", dir, dir, NULL);
g_hash_table_add (mounted, g_steal_pointer (&dir));
}
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
}
/* steamclient.so relies on this for communication with Steam */
steam_pid = g_build_filename (real_home, ".steam", "steam.pid", NULL);
if (g_file_test (steam_pid, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--ro-bind", steam_pid, steam_pid,
NULL);
/* Make sure Steam IPC is available.
* TODO: do we need this? do we need more? */
steam_pipe = g_build_filename (real_home, ".steam", "steam.pipe", NULL);
if (g_file_test (steam_pipe, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--bind", steam_pipe, steam_pipe,
NULL);
return TRUE;
}
typedef enum
{
TRISTATE_NO = 0,
TRISTATE_YES,
TRISTATE_MAYBE
} Tristate;
static char **opt_env_if_host = NULL;
static char *opt_fake_home = NULL;
static char *opt_freedesktop_app_id = NULL;
static char *opt_steam_app_id = NULL;
static char *opt_home = NULL;
static gboolean opt_host_fallback = FALSE;
static PvShell opt_shell = PV_SHELL_NONE;
static GPtrArray *opt_ld_preload = NULL;
static char *opt_runtime_base = NULL;
static char *opt_runtime = NULL;
static Tristate opt_share_home = TRISTATE_MAYBE;
static gboolean opt_verbose = FALSE;
static gboolean opt_version = FALSE;
static PvTerminal opt_terminal = PV_TERMINAL_AUTO;
static gboolean
opt_host_ld_preload_cb (const gchar *option_name,
const gchar *value,
gpointer data,
GError **error)
{
gchar *preload = g_strdup_printf ("host:%s", value);
if (opt_ld_preload == NULL)
opt_ld_preload = g_ptr_array_new_with_free_func (g_free);
g_ptr_array_add (opt_ld_preload, g_steal_pointer (&preload));
return TRUE;
}
static gboolean
opt_shell_cb (const gchar *option_name,
const gchar *value,
gpointer data,
GError **error)
{
if (g_strcmp0 (option_name, "--shell-after") == 0)
value = "after";
else if (g_strcmp0 (option_name, "--shell-fail") == 0)
value = "fail";
else if (g_strcmp0 (option_name, "--shell-instead") == 0)
value = "instead";
if (value == NULL || *value == '\0')
{
return TRUE;
}
switch (value[0])
{
case 'a':
if (g_strcmp0 (value, "after") == 0)
{
return TRUE;
}
break;
case 'f':
if (g_strcmp0 (value, "fail") == 0)
{
return TRUE;
}
break;
case 'i':
if (g_strcmp0 (value, "instead") == 0)
{
return TRUE;
}
break;
case 'n':
if (g_strcmp0 (value, "none") == 0 || g_strcmp0 (value, "no") == 0)
{
return TRUE;
}
break;
default:
/* fall through to error */
break;
}
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
"Unknown choice \"%s\" for %s", value, option_name);
return FALSE;
}
static gboolean
opt_terminal_cb (const gchar *option_name,
const gchar *value,
gpointer data,
GError **error)
{
if (g_strcmp0 (option_name, "--tty") == 0)
value = "tty";
else if (g_strcmp0 (option_name, "--xterm") == 0)
value = "xterm";
if (value == NULL || *value == '\0')
{
return TRUE;
}
switch (value[0])
{
case 'a':
if (g_strcmp0 (value, "auto") == 0)
{
return TRUE;
}
break;
case 'n':
if (g_strcmp0 (value, "none") == 0 || g_strcmp0 (value, "no") == 0)
{
return TRUE;
}
break;
case 't':
if (g_strcmp0 (value, "tty") == 0)
{
return TRUE;
}
break;
case 'x':
if (g_strcmp0 (value, "xterm") == 0)
{
return TRUE;
}
break;
default:
/* fall through to error */
break;
}
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
"Unknown choice \"%s\" for %s", value, option_name);
return FALSE;
}
static gboolean
opt_share_home_cb (const gchar *option_name,
const gchar *value,
gpointer data,
GError **error)
{
if (g_strcmp0 (option_name, "--share-home") == 0)
opt_share_home = TRISTATE_YES;
else if (g_strcmp0 (option_name, "--unshare-home") == 0)
opt_share_home = TRISTATE_NO;
else
g_return_val_if_reached (FALSE);
return TRUE;
}
static GOptionEntry options[] =
{
{ "env-if-host", 0, 0, G_OPTION_ARG_STRING_ARRAY, &opt_env_if_host,
"Set VAR=VAL if COMMAND is run with /usr from the host system, "
"but not if it is run with /usr from RUNTIME.", "VAR=VAL" },
{ "freedesktop-app-id", 0, 0, G_OPTION_ARG_STRING, &opt_freedesktop_app_id,
"Make --unshare-home use ~/.var/app/ID as home directory, where ID "
"is com.example.MyApp or similar. This interoperates with Flatpak. "
"[Default: $PRESSURE_VESSEL_FDO_APP_ID if set]",
"ID" },
{ "steam-app-id", 0, 0, G_OPTION_ARG_STRING, &opt_steam_app_id,
"Make --unshare-home use ~/.var/app/com.steampowered.AppN "
"as home directory. [Default: $SteamAppId]", "N" },
{ "home", 0, 0, G_OPTION_ARG_FILENAME, &opt_home,
"Use HOME as home directory. Implies --unshare-home. "
"[Default: $PRESSURE_VESSEL_HOME if set]", "HOME" },
{ "host-fallback", 0, 0, G_OPTION_ARG_NONE, &opt_host_fallback,
"Run COMMAND on the host system if we cannot run it in a container.", NULL },
{ "host-ld-preload", 0, 0, G_OPTION_ARG_CALLBACK, &opt_host_ld_preload_cb,
"Add MODULE from the host system to LD_PRELOAD when executing COMMAND.",
"MODULE" },
{ "runtime", 0, 0, G_OPTION_ARG_FILENAME, &opt_runtime,
"Mount the given sysroot or merged /usr in the container, and augment "
"it with the host system's graphics stack. The empty string "
"means don't use a runtime. [Default: $PRESSURE_VESSEL_RUNTIME or '']",
{ "runtime-base", 0, 0, G_OPTION_ARG_FILENAME, &opt_runtime_base,
"If a --runtime is a relative path, look for it relative to BASE. "
"[Default: $PRESSURE_VESSEL_RUNTIME_BASE or '.']",
"BASE" },
{ "share-home", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_share_home_cb,
"Use the real home directory. "
"[Default unless $PRESSURE_VESSEL_HOME is set or "
"$PRESSURE_VESSEL_SHARE_HOME is 0]",
NULL },
{ "unshare-home", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_share_home_cb,
"Use an app-specific home directory chosen according to --home, "
"--freedesktop-app-id, --steam-app-id or $SteamAppId. "
"[Default if $PRESSURE_VESSEL_HOME is set or "
"$PRESSURE_VESSEL_SHARE_HOME is 0]",
NULL },
{ "shell", 0, 0, G_OPTION_ARG_CALLBACK, opt_shell_cb,
"--shell=after is equivalent to --shell-after, and so on. "
"[Default: $PRESSURE_VESSEL_SHELL or 'none']",
"{none|after|fail|instead}" },
{ "shell-after", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_shell_cb,
"Run an interactive shell after COMMAND. Executing \"$@\" in that "
"shell will re-run COMMAND [ARGS].",
NULL },
{ "shell-fail", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_shell_cb,
"Run an interactive shell after COMMAND, but only if it fails.",
NULL },
{ "shell-instead", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_shell_cb,
"Run an interactive shell instead of COMMAND. Executing \"$@\" in that "
"shell will run COMMAND [ARGS].",
NULL },
{ "terminal", 0, 0, G_OPTION_ARG_CALLBACK, opt_terminal_cb,
"none: disable features that would use a terminal; "
"auto: equivalent to xterm if a --shell option is used, or none; "
"xterm: put game output (and --shell if used) in an xterm; "
"tty: put game output (and --shell if used) on Steam's "
"controlling tty "
"[Default: $PRESSURE_VESSEL_TERMINAL or 'auto']",
"{none|auto|xterm|tty}" },
{ "tty", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_terminal_cb,
"Equivalent to --terminal=tty", NULL },
{ "xterm", 0, G_OPTION_FLAG_NO_ARG, G_OPTION_ARG_CALLBACK, opt_terminal_cb,
"Equivalent to --terminal=xterm", NULL },
{ "verbose", 0, 0, G_OPTION_ARG_NONE, &opt_verbose,
"Be more verbose.", NULL },
{ "version", 0, 0, G_OPTION_ARG_NONE, &opt_version,
"Print version number and exit.", NULL },
{ NULL }
};
static gboolean
boolean_environment (const gchar *name,
gboolean def)
{
const gchar *value = g_getenv (name);
if (g_strcmp0 (value, "1") == 0)
return TRUE;
if (g_strcmp0 (value, "") == 0 || g_strcmp0 (value, "0") == 0)
return FALSE;
if (value != NULL)
g_warning ("Unrecognised value \"%s\" for $%s", value, name);
return def;
}
static Tristate
tristate_environment (const gchar *name)
{
const gchar *value = g_getenv (name);
if (g_strcmp0 (value, "1") == 0)
return TRISTATE_YES;
if (g_strcmp0 (value, "0") == 0)
return TRISTATE_NO;
if (value != NULL && value[0] != '\0')
g_warning ("Unrecognised value \"%s\" for $%s", value, name);
return TRISTATE_MAYBE;
}
static void
cli_log_func (const gchar *log_domain,
GLogLevelFlags log_level,
const gchar *message,
gpointer user_data)
{
g_printerr ("%s: %s\n", (const char *) user_data, message);
}
int
main (int argc,
char *argv[])
{
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
g_autoptr(GError) local_error = NULL;
GError **error = &local_error;
int ret = 2;
gsize i;
g_auto(GStrv) original_argv = NULL;
int original_argc = argc;
g_autoptr(FlatpakBwrap) bwrap = NULL;
g_autoptr(FlatpakBwrap) wrapped_command = NULL;
g_autofree gchar *tmpdir = NULL;
g_autofree gchar *scratch = NULL;
g_autofree gchar *overrides = NULL;
g_autofree gchar *bwrap_executable = NULL;
g_autoptr(GString) ld_library_path = g_string_new ("");
g_autoptr(GString) adjusted_ld_preload = g_string_new ("");
g_autofree gchar *cwd_p = NULL;
g_autofree gchar *cwd_l = NULL;
const gchar *home;
g_autofree gchar *bwrap_help = NULL;
g_autofree gchar *tools_dir = NULL;
const gchar *bwrap_help_argv[] = { "<bwrap>", "--help", NULL };
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
g_set_prgname ("pressure-vessel-wrap");
g_log_set_handler (G_LOG_DOMAIN,
G_LOG_LEVEL_WARNING | G_LOG_LEVEL_MESSAGE,
cli_log_func, (void *) g_get_prgname ());
original_argv = g_new0 (char *, argc + 1);
for (i = 0; i < argc; i++)
original_argv[i] = g_strdup (argv[i]);
if (g_getenv ("STEAM_RUNTIME") != NULL)
{
g_printerr ("%s: This program should not be run in the Steam Runtime.",
g_get_prgname ());
g_printerr ("%s: Use pressure-vessel-unruntime instead.",
g_get_prgname ());
ret = 2;
goto out;
}
/* Set defaults */
opt_freedesktop_app_id = g_strdup (g_getenv ("PRESSURE_VESSEL_FDO_APP_ID"));
if (opt_freedesktop_app_id != NULL && opt_freedesktop_app_id[0] == '\0')
g_clear_pointer (&opt_freedesktop_app_id, g_free);
opt_home = g_strdup (g_getenv ("PRESSURE_VESSEL_HOME"));
if (opt_home != NULL && opt_home[0] == '\0')
g_clear_pointer (&opt_home, g_free);
opt_share_home = tristate_environment ("PRESSURE_VESSEL_SHARE_HOME");
opt_verbose = boolean_environment ("PRESSURE_VESSEL_VERBOSE", FALSE);
if (!opt_shell_cb ("$PRESSURE_VESSEL_SHELL",
g_getenv ("PRESSURE_VESSEL_SHELL"), NULL, error))
goto out;
if (!opt_terminal_cb ("$PRESSURE_VESSEL_TERMINAL",
g_getenv ("PRESSURE_VESSEL_TERMINAL"), NULL, error))
goto out;
context = g_option_context_new ("[--] COMMAND [ARGS]\n"
"Run COMMAND [ARGS] in a container.\n");
g_option_context_add_main_entries (context, options, NULL);
if (!g_option_context_parse (context, &argc, &argv, error))
goto out;
if (opt_runtime == NULL)
opt_runtime = g_strdup (g_getenv ("PRESSURE_VESSEL_RUNTIME"));
if (opt_runtime_base == NULL)
opt_runtime_base = g_strdup (g_getenv ("PRESSURE_VESSEL_RUNTIME_BASE"));
if (opt_runtime != NULL
&& opt_runtime[0] != '\0'
&& !g_path_is_absolute (opt_runtime)
&& opt_runtime_base != NULL
&& opt_runtime_base[0] != '\0')
{
g_autofree gchar *tmp = g_steal_pointer (&opt_runtime);
opt_runtime = g_build_filename (opt_runtime_base, tmp, NULL);
}
if (opt_version)
{
g_print ("pressure-vessel version %s\n", VERSION);
ret = 0;
goto out;
}
if (argc < 2)
{
g_printerr ("%s: An executable to run is required\n",
g_get_prgname ());
goto out;
}
if (opt_terminal == PV_TERMINAL_AUTO)
if (opt_shell != PV_SHELL_NONE)
opt_terminal = PV_TERMINAL_XTERM;
if (opt_terminal == PV_TERMINAL_NONE && opt_shell != PV_SHELL_NONE)
g_printerr ("%s: --terminal=none is incompatible with --shell\n",
g_get_prgname ());
goto out;
if (strcmp (argv[1], "--") == 0)
{
argv++;
argc--;
}
home = g_get_home_dir ();
if (opt_share_home == TRISTATE_YES)
{
opt_fake_home = NULL;
}
else if (opt_home)
{
opt_fake_home = g_strdup (opt_home);
}
else if (opt_share_home == TRISTATE_MAYBE)
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
{
opt_fake_home = NULL;
}
else if (opt_freedesktop_app_id)
{
opt_fake_home = g_build_filename (home, ".var", "app",
opt_freedesktop_app_id, NULL);
}
else if (opt_steam_app_id)
{
opt_freedesktop_app_id = g_strdup_printf ("com.steampowered.App%s",
opt_steam_app_id);
opt_fake_home = g_build_filename (home, ".var", "app",
opt_freedesktop_app_id, NULL);
}
else if (g_getenv ("SteamAppId") != NULL)
{
opt_freedesktop_app_id = g_strdup_printf ("com.steampowered.App%s",
g_getenv ("SteamAppId"));
opt_fake_home = g_build_filename (home, ".var", "app",
opt_freedesktop_app_id, NULL);
}
else
{
g_printerr ("%s: Either --home, --freedesktop-app-id, --steam-app-id "
"or $SteamAppId is required\n",
g_get_prgname ());
goto out;
}
if (opt_env_if_host != NULL)
{
for (i = 0; opt_env_if_host[i] != NULL; i++)
{
const char *equals = strchr (opt_env_if_host[i], '=');
if (equals == NULL)
g_printerr ("%s: --env-if-host argument must be of the form "
"NAME=VALUE, not \"%s\"\n",
g_get_prgname (), opt_env_if_host[i]);
}
}
/* Finished parsing arguments, so any subsequent failures will make
* us exit 1. */
ret = 1;
if (opt_terminal != PV_TERMINAL_TTY)
{
int fd;
if (!glnx_openat_rdonly (-1, "/dev/null", TRUE, &fd, error))
goto out;
if (dup2 (fd, STDIN_FILENO) < 0)
{
glnx_throw_errno_prefix (error,
"Cannot replace stdin with /dev/null");
goto out;
}
}
pv_get_current_dirs (&cwd_p, &cwd_l);
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
if (opt_verbose)
{
g_auto(GStrv) env = g_get_environ ();
g_log_set_handler (G_LOG_DOMAIN,
G_LOG_LEVEL_DEBUG | G_LOG_LEVEL_INFO,
cli_log_func, (void *) g_get_prgname ());
g_message ("Original argv:");
for (i = 0; i < original_argc; i++)
{
g_autofree gchar *quoted = g_shell_quote (original_argv[i]);
g_message ("\t%" G_GSIZE_FORMAT ": %s", i, quoted);
}
g_message ("Current working directory:");
g_message ("\tPhysical: %s", cwd_p);
g_message ("\tLogical: %s", cwd_l);
g_message ("Environment variables:");
qsort (env, g_strv_length (env), sizeof (char *), pv_envp_cmp);
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
for (i = 0; env[i] != NULL; i++)
{
g_autofree gchar *quoted = g_shell_quote (env[i]);
g_message ("\t%s", env[i]);
}
g_message ("Wrapped command:");
for (i = 1; i < argc; i++)
{
g_autofree gchar *quoted = g_shell_quote (argv[i]);
g_message ("\t%" G_GSIZE_FORMAT ": %s", i, quoted);
}
}
tools_dir = find_executable_dir (error);
if (tools_dir == NULL)
goto out;
g_debug ("Found executable directory: %s", tools_dir);
wrapped_command = flatpak_bwrap_new (NULL);
switch (opt_terminal)
g_debug ("Wrapping command to use tty");
if (!pv_bwrap_wrap_tty (wrapped_command, error))
g_debug ("Wrapping command with xterm");
pv_bwrap_wrap_in_xterm (wrapped_command);
case PV_TERMINAL_AUTO:
case PV_TERMINAL_NONE:
default:
/* do nothing */
break;
if (opt_shell != PV_SHELL_NONE || opt_terminal == PV_TERMINAL_XTERM)
/* In the (PV_SHELL_NONE, PV_TERMINAL_XTERM) case, just don't let the
* xterm close before the user has had a chance to see the output */
pv_bwrap_wrap_interactive (wrapped_command, opt_shell);
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
}
if (argv[1][0] == '-')
{
/* Make sure wrapped_command is something we can validly pass to env(1) */
if (strchr (argv[1], '=') != NULL)
flatpak_bwrap_add_args (wrapped_command,
"sh", "-euc", "exec \"$@\"", "sh",
NULL);
/* Make sure bwrap will interpret wrapped_command as the end of its
* options */
flatpak_bwrap_add_arg (wrapped_command, "env");
}
g_debug ("Setting arguments for wrapped command");
flatpak_bwrap_append_argsv (wrapped_command, &argv[1], argc - 1);
g_debug ("Checking for bwrap...");
bwrap_executable = check_bwrap (tools_dir);
if (bwrap_executable == NULL)
{
if (opt_host_fallback)
{
g_message ("Falling back to executing wrapped command directly");
if (opt_env_if_host != NULL)
{
for (i = 0; opt_env_if_host[i] != NULL; i++)
{
char *equals = strchr (opt_env_if_host[i], '=');
g_assert (equals != NULL);
*equals = '\0';
flatpak_bwrap_set_env (wrapped_command, opt_env_if_host[i],
equals + 1, TRUE);
}
}
flatpak_bwrap_finish (wrapped_command);
/* flatpak_bwrap_finish did this */
g_assert (g_ptr_array_index (wrapped_command->argv,
wrapped_command->argv->len - 1) == NULL);
execvpe (g_ptr_array_index (wrapped_command->argv, 0),
(char * const *) wrapped_command->argv->pdata,
wrapped_command->envp);
glnx_throw_errno_prefix (error, "execvpe %s",
(gchar *) g_ptr_array_index (wrapped_command->argv, 0));
goto out;
}
else
{
goto out;
}
}
g_debug ("Checking bwrap features...");
bwrap_help_argv[0] = bwrap_executable;
bwrap_help = capture_output (bwrap_help_argv, error);
if (bwrap_help == NULL)
goto out;
g_debug ("Creating temporary directories...");
tmpdir = g_dir_make_tmp ("pressure-vessel-wrap.XXXXXX", error);
if (tmpdir == NULL)
goto out;
scratch = g_build_filename (tmpdir, "scratch", NULL);
g_mkdir (scratch, 0700);
overrides = g_build_filename (tmpdir, "overrides", NULL);
g_mkdir (overrides, 0700);
bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_arg (bwrap, bwrap_executable);
/* Protect the controlling terminal from the app/game, unless we are
* running an interactive shell in which case that would break its
* job control. */
if (opt_terminal != PV_TERMINAL_TTY)
flatpak_bwrap_add_arg (bwrap, "--new-session");
if (opt_runtime != NULL && opt_runtime[0] != '\0')
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
{
g_debug ("Configuring runtime...");
/* TODO: Adapt the use_ld_so_cache code from Flatpak instead
* of setting LD_LIBRARY_PATH, for better robustness against
* games that set their own LD_LIBRARY_PATH ignoring what they
* got from the environment */
for (i = 0; i < G_N_ELEMENTS (multiarch_tuples); i++)
{
g_autofree gchar *ld_path = NULL;
ld_path = g_build_filename ("/overrides", "lib",
multiarch_tuples[i], NULL);
search_path_append (ld_library_path, ld_path);
}
/* This would be filtered out by a setuid bwrap, so we have to go
* via --setenv. */
flatpak_bwrap_add_args (bwrap,
"--setenv", "LD_LIBRARY_PATH",
ld_library_path->str,
NULL);
if (!bind_runtime (bwrap, tools_dir, opt_runtime, overrides,
scratch, error))
goto out;
}
else
{
flatpak_bwrap_add_args (bwrap,
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
"--bind", "/", "/",
NULL);
}
/* Make /dev available */
flatpak_bwrap_add_args (bwrap,
"--dev-bind", "/dev", "/dev",
NULL);
if (g_file_test ("/dev/pts", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--dev-bind", "/dev/pts", "/dev/pts",
NULL);
if (g_file_test ("/dev/shm", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--dev-bind", "/dev/shm", "/dev/shm",
NULL);
/* Protect other users' homes (but guard against the unlikely
* situation that they don't exist) */
if (g_file_test ("/home", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/home",
NULL);
if (opt_fake_home == NULL)
{
flatpak_bwrap_add_args (bwrap,
"--bind", home, home,
NULL);
}
else
{
if (!use_fake_home (bwrap, opt_fake_home, error))
goto out;
}
g_debug ("Adjusting LD_PRELOAD...");
/* We need the LD_PRELOADs from Steam visible at the paths that were
* used for them, which might be their physical rather than logical
* locations. */
if (opt_ld_preload != NULL)
{
for (i = 0; i < opt_ld_preload->len; i++)
{
const char *preload = g_ptr_array_index (opt_ld_preload, i);
g_assert (preload != NULL);
if (*preload == '\0')
continue;
/* We have the beginnings of infrastructure to set a LD_PRELOAD
* from inside the container, but currently the only thing we
* support is it coming from the host. */
g_assert (g_str_has_prefix (preload, "host:"));
preload = preload + 5;
if (g_file_test (preload, G_FILE_TEST_EXISTS))
{
if (opt_runtime != NULL
&& opt_runtime[0] != '\0'
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
&& (g_str_has_prefix (preload, "/usr/")
|| g_str_has_prefix (preload, "/lib")))
{
g_autofree gchar *in_run_host = g_build_filename ("/run/host",
preload,
NULL);
/* When using a runtime we can't write to /usr/ or /libQUAL/,
* so redirect this preloaded module to the corresponding
* location in /run/host. */
search_path_append (adjusted_ld_preload, in_run_host);
}
else
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", preload, preload,
NULL);
search_path_append (adjusted_ld_preload, preload);
}
}
else
{
g_debug ("LD_PRELOAD module '%s' does not exist", preload);
}
}
}
/* Put the caller's LD_PRELOAD back.
* This would be filtered out by a setuid bwrap, so we have to go
* via --setenv. */
if (adjusted_ld_preload->len != 0)
flatpak_bwrap_add_args (bwrap,
"--setenv", "LD_PRELOAD",
adjusted_ld_preload->str,
NULL);
else
flatpak_bwrap_add_args (bwrap,
"--unsetenv", "LD_PRELOAD",
NULL);
/* Make sure the current working directory (the game we are going to
* run) is available. Some games write here. */
g_debug ("Making home directory available...");
if (pv_is_same_file (home, cwd_p))
{
g_debug ("Not making physical working directory \"%s\" available to "
"container because it is the home directory",
cwd_p);
}
else
{
flatpak_bwrap_add_args (bwrap,
"--bind", cwd_p, cwd_p,
NULL);
}
flatpak_bwrap_add_args (bwrap,
"--chdir", cwd_p,
"--unsetenv", "PWD",
NULL);
/* TODO: Potential future expansion: use --unshare-pid for more isolation */
/* Put Steam Runtime environment variables back, if /usr is mounted
* from the host. */
if (opt_runtime == NULL && opt_runtime[0] != '\0')
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
{
g_debug ("Making Steam Runtime available...");
/* We need libraries from the Steam Runtime, so make sure that's
* visible (it should never need to be read/write though) */
if (opt_env_if_host != NULL)
{
for (i = 0; opt_env_if_host[i] != NULL; i++)
{
char *equals = strchr (opt_env_if_host[i], '=');
g_assert (equals != NULL);
if (g_str_has_prefix (opt_env_if_host[i], "STEAM_RUNTIME=/"))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", equals + 1,
equals + 1,
NULL);
}
*equals = '\0';
/* We do this via --setenv instead of flatpak_bwrap_set_env()
* to make sure they aren't filtered out by a setuid bwrap. */
flatpak_bwrap_add_args (bwrap,
"--setenv", opt_env_if_host[i],
equals + 1,
NULL);
*equals = '=';
}
}
}
if (opt_verbose)
{
g_message ("%s options before bundling:", bwrap_executable);
for (i = 0; i < bwrap->argv->len; i++)
{
g_autofree gchar *quoted = NULL;
quoted = g_shell_quote (g_ptr_array_index (bwrap->argv, i));
g_message ("\t%s", quoted);
}
}
if (!flatpak_bwrap_bundle_args (bwrap, 1, -1, FALSE, error))
goto out;
g_debug ("Adding wrapped command...");
flatpak_bwrap_append_args (bwrap, wrapped_command->argv);
if (opt_verbose)
{
g_message ("Final %s options:", bwrap_executable);
for (i = 0; i < bwrap->argv->len; i++)
{
g_autofree gchar *quoted = NULL;
quoted = g_shell_quote (g_ptr_array_index (bwrap->argv, i));
g_message ("\t%s", quoted);
}
g_message ("%s environment:", bwrap_executable);
for (i = 0; bwrap->envp != NULL && bwrap->envp[i] != NULL; i++)
{
g_autofree gchar *quoted = NULL;
quoted = g_shell_quote (bwrap->envp[i]);
g_message ("\t%s", quoted);
}
flatpak_bwrap_finish (bwrap);
/* Clean up temporary directory before running our long-running process */
if (tmpdir != NULL &&
!glnx_shutil_rm_rf_at (-1, tmpdir, NULL, error))
{
g_warning ("Unable to delete temporary directory: %s",
local_error->message);
g_clear_error (&local_error);
}
g_clear_pointer (&tmpdir, g_free);
/* flatpak_bwrap_finish did this */
g_assert (g_ptr_array_index (bwrap->argv, bwrap->argv->len - 1) == NULL);
g_debug ("Replacing self with bwrap...");
flatpak_bwrap_child_setup_cb (bwrap->fds);
execve (bwrap->argv->pdata[0],
(char * const *) bwrap->argv->pdata,
bwrap->envp);
/* If we are still here then execve failed */
g_warning ("execve failed: %s", g_strerror (errno));
out:
if (local_error != NULL)
g_warning ("%s", local_error->message);
if (tmpdir != NULL &&
!glnx_shutil_rm_rf_at (-1, tmpdir, NULL, error))
{
g_warning ("Unable to delete temporary directory: %s",
local_error->message);
g_clear_error (&local_error);
}
g_clear_pointer (&opt_ld_preload, g_ptr_array_unref);
g_clear_pointer (&opt_env_if_host, g_strfreev);
g_clear_pointer (&opt_freedesktop_app_id, g_free);
g_clear_pointer (&opt_steam_app_id, g_free);
g_clear_pointer (&opt_home, g_free);
g_clear_pointer (&opt_fake_home, g_free);
g_clear_pointer (&opt_runtime_base, g_free);
g_clear_pointer (&opt_runtime, g_free);
return ret;
}