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/* 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 © 2017-2020 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 <glib.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#include <stdlib.h>
#include "bwrap.h"
#include "bwrap-lock.h"
#include "flatpak-bwrap-private.h"
#include "flatpak-run-private.h"
#include "flatpak-utils-base-private.h"
#include "flatpak-utils-private.h"
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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 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;
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,
gboolean only_prepare)
{
g_autoptr(GError) local_error = NULL;
GError **error = &local_error;

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g_autofree gchar *bwrap_executable = NULL;
const char *bwrap_test_argv[] =
{
NULL,
"--bind", "/", "/",
"true",
NULL
};
g_return_val_if_fail (tools_dir != NULL, NULL);

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bwrap_executable = find_bwrap (tools_dir);
if (bwrap_executable == NULL)
{
g_warning ("Cannot find bwrap");
}
else if (only_prepare)
{
/* With --only-prepare we don't necessarily expect to be able to run
* it anyway (we are probably in a Docker container that doesn't allow
* creation of nested user namespaces), so just assume that it's the
* right one. */
return g_steal_pointer (&bwrap_executable);
}
int wait_status;
g_autofree gchar *child_stdout = NULL;
g_autofree gchar *child_stderr = NULL;
bwrap_test_argv[0] = bwrap_executable;
/* We use LEAVE_DESCRIPTORS_OPEN to work around a deadlock in older GLib,
* see flatpak_close_fds_workaround */
if (!g_spawn_sync (NULL, /* cwd */
(gchar **) bwrap_test_argv,
NULL, /* environ */
G_SPAWN_LEAVE_DESCRIPTORS_OPEN,
flatpak_bwrap_child_setup_cb, NULL,
&child_stdout,
&child_stderr,
error))
{
g_warning ("Cannot run bwrap: %s", local_error->message);
g_clear_error (&local_error);
}
else if (wait_status != 0)
g_warning ("Cannot run bwrap: wait status %d", wait_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;
}

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static gchar *
check_flatpak_spawn (void)
{
g_autoptr(GError) local_error = NULL;
GError **error = &local_error;
g_autofree gchar *spawn_exec = NULL;
g_autofree gchar *child_stdout = NULL;
g_autofree gchar *child_stderr = NULL;
int wait_status;
const char *spawn_test_argv[] =
{
NULL,
"--host",
"--directory=/",
"true",
NULL
};
/* All known Flatpak runtimes have flatpak-spawn in the PATH */
spawn_exec = g_find_program_in_path ("flatpak-spawn");
if (spawn_exec == NULL
|| !g_file_test (spawn_exec, G_FILE_TEST_IS_EXECUTABLE))
return NULL;

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spawn_test_argv[0] = spawn_exec;
if (!g_spawn_sync (NULL, /* cwd */
(gchar **) spawn_test_argv,
NULL, /* environ */
G_SPAWN_DEFAULT,
NULL, NULL, /* child setup */
&child_stdout,
&child_stderr,
&wait_status,
error))
{
g_warning ("Cannot run flatpak-spawn: %s", local_error->message);
g_clear_error (&local_error);
}
else if (wait_status != 0)
{
g_warning ("Cannot run flatpak-spawn: wait status %d", wait_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 (&spawn_exec);
}
return NULL;
}
/*
* Export most root directories, but not the ones that
* "flatpak run --filesystem=host" would skip.
* (See flatpak_context_export(), which might replace this function
* later on.)
*
* If we are running inside Flatpak, we assume that any directory
* that is made available in the root, and is not in dont_mount_in_root,
* came in via --filesystem=host or similar and matches its equivalent
* on the real root filesystem.
*/
static gboolean
export_root_dirs_like_filesystem_host (FlatpakExports *exports,
FlatpakFilesystemMode mode,
GError **error)
{
g_autoptr(GDir) dir = NULL;
const char *member = NULL;
g_return_val_if_fail (exports != NULL, FALSE);
g_return_val_if_fail ((unsigned) mode <= FLATPAK_FILESYSTEM_MODE_LAST, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
dir = g_dir_open ("/", 0, error);
if (dir == NULL)
return FALSE;
for (member = g_dir_read_name (dir);
member != NULL;
member = g_dir_read_name (dir))
{
g_autofree gchar *path = NULL;
if (g_strv_contains (dont_mount_in_root, member))
continue;
path = g_build_filename ("/", member, NULL);
flatpak_exports_add_path_expose (exports, mode, path);
}
/* For parity with Flatpak's handling of --filesystem=host */
flatpak_exports_add_path_expose (exports, mode, "/run/media");
return TRUE;
}
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/*
* This function assumes that /run on the host is the same as in the
* current namespace, so it won't work in Flatpak.
*/
static gboolean
export_contents_of_run (FlatpakBwrap *bwrap,
GError **error)
{
static const char *ignore[] =
{
"gfx", /* can be created by pressure-vessel */
"host", /* created by pressure-vessel */
"media", /* see export_root_dirs_like_filesystem_host() */
"pressure-vessel", /* created by pressure-vessel */
NULL
};
g_autoptr(GDir) dir = NULL;
const char *member = NULL;
g_return_val_if_fail (bwrap != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_return_val_if_fail (g_file_test ("/.flatpak-info", G_FILE_TEST_EXISTS),
FALSE);
dir = g_dir_open ("/run", 0, error);
if (dir == NULL)
return FALSE;
for (member = g_dir_read_name (dir);
member != NULL;
member = g_dir_read_name (dir))
{
g_autofree gchar *path = NULL;
if (g_strv_contains (ignore, member))
continue;
path = g_build_filename ("/run", member, NULL);
flatpak_bwrap_add_args (bwrap,
"--bind", path, path,
NULL);
}
return TRUE;
}
bind_and_propagate_from_environ (FlatpakExports *exports,
FlatpakBwrap *bwrap,
FlatpakFilesystemMode mode,
const char *variable)

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g_autofree gchar *value_host = NULL;
g_autofree gchar *canon = NULL;
const char *value;
g_return_if_fail (exports != NULL);
g_return_if_fail ((unsigned) mode <= FLATPAK_FILESYSTEM_MODE_LAST);
g_return_if_fail (variable != NULL);
value = g_getenv (variable);
if (value == NULL)
return;
if (!g_file_test (value, G_FILE_TEST_EXISTS))
{
g_debug ("Not bind-mounting %s=\"%s\" because it does not exist",
variable, value);
return;
}
canon = g_canonicalize_filename (value, NULL);
value_host = pv_current_namespace_path_to_host_path (canon);

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g_debug ("Bind-mounting %s=\"%s\" from the current env as %s=\"%s\" in the host",
variable, value, variable, value_host);
flatpak_exports_add_path_expose (exports, mode, canon);
if (strcmp (value, value_host) != 0)
flatpak_bwrap_add_args (bwrap,
"--setenv", variable, value_host,
NULL);
/* 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 (FlatpakExports *exports,
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;
gsize i;
g_return_val_if_fail (bwrap != NULL, FALSE);
g_return_val_if_fail (exports != 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", tmp, "/var/tmp",
"--setenv", "XDG_CACHE_HOME", cache,
"--setenv", "XDG_CONFIG_HOME", config,
"--setenv", "XDG_DATA_HOME", data,
NULL);
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
fake_home);
/*
* 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_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_ONLY,
dir);
}
/* steamclient.so relies on this for communication with Steam */
steam_pid = g_build_filename (real_home, ".steam", "steam.pid", NULL);
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_ONLY,
steam_pid);
/* 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);
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
steam_pipe);
return TRUE;
}
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/*
* @bwrap: Arguments produced by flatpak_exports_append_bwrap_args(),
* not including an executable name (the 0'th argument must be
* `--bind` or similar)
* @home: The home directory
*
* Adjust arguments in @bwrap to cope with potentially running in a
* container.
*/
static void
adjust_exports (FlatpakBwrap *bwrap,
const char *home)
{
gsize i = 0;
while (i < bwrap->argv->len)
{
const char *opt = bwrap->argv->pdata[i];
g_assert (opt != NULL);
if (g_str_equal (opt, "--symlink"))
{
g_assert (i + 3 <= bwrap->argv->len);
/* pdata[i + 1] is the target: unchanged. */
/* pdata[i + 2] is a path in the final container: unchanged. */
i += 3;
}
else if (g_str_equal (opt, "--dir") ||
g_str_equal (opt, "--tmpfs"))
{
g_assert (i + 2 <= bwrap->argv->len);
/* pdata[i + 1] is a path in the final container: unchanged. */
i += 2;
}
else if (g_str_equal (opt, "--ro-bind") ||
g_str_equal (opt, "--bind"))
{
g_autofree gchar *src = NULL;
g_assert (i + 3 <= bwrap->argv->len);
src = g_steal_pointer (&bwrap->argv->pdata[i + 1]);
/* pdata[i + 2] is a path in the final container: unchanged. */
/* Paths in the home directory might need adjusting.
* Paths outside the home directory do not: if they're part of
* /run/host, they've been adjusted already by
* flatpak_exports_take_host_fd(), and if not, they appear in
* the container with the same path as on the host. */
if (flatpak_has_path_prefix (src, home))
bwrap->argv->pdata[i + 1] = pv_current_namespace_path_to_host_path (src);
else
bwrap->argv->pdata[i + 1] = g_steal_pointer (&src);
i += 3;
}
else
{
g_return_if_reached ();
}
}
}
typedef enum
{
TRISTATE_NO = 0,
TRISTATE_YES,
TRISTATE_MAYBE
} Tristate;
static gboolean opt_batch = FALSE;
static char *opt_copy_runtime_into = NULL;
static char **opt_env_if_host = NULL;
static char *opt_fake_home = NULL;
static char **opt_filesystems = NULL;
static char *opt_freedesktop_app_id = NULL;
static char *opt_steam_app_id = NULL;
static gboolean opt_gc_runtimes = TRUE;
static gboolean opt_generate_locales = TRUE;
static char *opt_home = NULL;
static gboolean opt_host_fallback = FALSE;
static char *opt_graphics_provider = NULL;
static char *graphics_provider_mount_point = NULL;
static gboolean opt_only_prepare = FALSE;
static gboolean opt_remove_game_overlay = 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_share_pid = TRUE;
static double opt_terminate_idle_timeout = 0.0;
static double opt_terminate_timeout = -1.0;
static gboolean opt_verbose = FALSE;
static gboolean opt_version = FALSE;
static gboolean opt_version_only = FALSE;
static gboolean opt_test = FALSE;
static PvTerminal opt_terminal = PV_TERMINAL_AUTO;
static char *opt_write_bwrap = NULL;
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;
}
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static gboolean
opt_with_host_graphics_cb (const gchar *option_name,
const gchar *value,
gpointer data,
GError **error)
{
/* This is the old way to get the graphics from the host system */
if (g_strcmp0 (option_name, "--with-host-graphics") == 0)
{
if (g_file_test ("/run/host", G_FILE_TEST_IS_DIR))
opt_graphics_provider = g_strdup ("/run/host");
else
opt_graphics_provider = g_strdup ("/");
}
/* This is the old way to avoid using graphics from the host */
else if (g_strcmp0 (option_name, "--without-host-graphics") == 0)
{
opt_graphics_provider = g_strdup ("");
}
else
{
g_return_val_if_reached (FALSE);
}
g_warning ("\"--with-host-graphics\" and \"--without-host-graphics\" have "
"been deprecated and could be removed in future releases. Please use "
"use \"--graphics-provider=/\", \"--graphics-provider=/run/host\" or "
"\"--graphics-provider=\" instead.");
return TRUE;
}
static GOptionEntry options[] =
{
{ "batch", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_batch,
"Disable all interactivity and redirection: ignore --shell*, "
"--terminal, --xterm, --tty. [Default: if $PRESSURE_VESSEL_BATCH]", NULL },
{ "copy-runtime-into", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_FILENAME, &opt_copy_runtime_into,
"If a --runtime is used, copy it into DIR and edit the copy in-place. "
"[Default: $PRESSURE_VESSEL_COPY_RUNTIME_INTO or empty]",
"DIR" },
{ "env-if-host", '\0',
G_OPTION_FLAG_NONE, 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" },
{ "filesystem", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_FILENAME_ARRAY, &opt_filesystems,
"Share filesystem directories with the container. "
"They must currently be given as absolute paths.",
"PATH" },
{ "freedesktop-app-id", '\0',
G_OPTION_FLAG_NONE, 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]",
{ "steam-app-id", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_STRING, &opt_steam_app_id,
"Make --unshare-home use ~/.var/app/com.steampowered.AppN "
"as home directory. [Default: $SteamAppId]", "N" },
{ "gc-runtimes", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_gc_runtimes,
"If using --copy-runtime-into, garbage-collect old temporary "
"runtimes. [Default, unless $PRESSURE_VESSEL_GC_RUNTIMES is 0]",
NULL },
{ "no-gc-runtimes", '\0',
G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &opt_gc_runtimes,
"If using --copy-runtime-into, don't garbage-collect old "
"temporary runtimes.", NULL },
{ "generate-locales", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_generate_locales,
"If using --runtime, attempt to generate any missing locales. "
"[Default, unless $PRESSURE_VESSEL_GENERATE_LOCALES is 0]",
NULL },
{ "no-generate-locales", '\0',
G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &opt_generate_locales,
"If using --runtime, don't generate any missing locales.", NULL },
{ "home", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_FILENAME, &opt_home,
"Use HOME as home directory. Implies --unshare-home. "
"[Default: $PRESSURE_VESSEL_HOME if set]", "HOME" },
{ "host-fallback", '\0',
G_OPTION_FLAG_NONE, 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',
G_OPTION_FLAG_NONE, G_OPTION_ARG_CALLBACK, &opt_host_ld_preload_cb,
"Add MODULE from the host system to LD_PRELOAD when executing COMMAND.",
"MODULE" },
{ "graphics-provider", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_FILENAME, &opt_graphics_provider,
"If using --runtime, use PATH as the graphics provider. "
"The path is assumed to be relative to the current namespace, "
"and will be adjusted for use on the host system if pressure-vessel "
"is run in a container. The empty string means use the graphics "
"stack from container."
"[Default: $PRESSURE_VESSEL_GRAPHICS_PROVIDER or '/run/host' or '/']", "PATH" },
{ "remove-game-overlay", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_remove_game_overlay,
"Disable the Steam Overlay. "
"[Default if $PRESSURE_VESSEL_REMOVE_GAME_OVERLAY is 1]",
NULL },
{ "keep-game-overlay", '\0',
G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &opt_remove_game_overlay,
"Do not disable the Steam Overlay. "
"[Default unless $PRESSURE_VESSEL_REMOVE_GAME_OVERLAY is 1]",
NULL },
{ "runtime", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_FILENAME, &opt_runtime,
"Mount the given sysroot or merged /usr in the container, and augment "
"it with the provider's graphics stack. The empty string "
"means don't use a runtime. [Default: $PRESSURE_VESSEL_RUNTIME or '']",
{ "runtime-base", '\0',
G_OPTION_FLAG_NONE, 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 },
{ "share-pid", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_share_pid,
"Do not create a new process ID namespace for the app. "
"[Default, unless $PRESSURE_VESSEL_SHARE_PID is 0]",
NULL },
{ "unshare-pid", '\0',
G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &opt_share_pid,
"Create a new process ID namespace for the app. "
"[Default if $PRESSURE_VESSEL_SHARE_PID is 0]",
NULL },
{ "shell", '\0',
G_OPTION_FLAG_NONE, 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',
G_OPTION_FLAG_NONE, 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 },
{ "terminate-idle-timeout", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_DOUBLE, &opt_terminate_idle_timeout,
"If --terminate-timeout is used, wait this many seconds before "
"SECONDS" },
{ "terminate-timeout", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_DOUBLE, &opt_terminate_timeout,
"Send SIGTERM and SIGCONT to descendant processes that didn't "
"exit within --terminate-idle-timeout. If they don't all exit within "
"this many seconds, send SIGKILL and SIGCONT to survivors. If 0.0, "
"skip SIGTERM and use SIGKILL immediately. Implies --subreaper. "
"[Default: -1.0, meaning don't signal].",
"SECONDS" },
{ "verbose", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_verbose,
"Be more verbose.", NULL },
{ "version", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_version,
"Print version number and exit.", NULL },
{ "version-only", '\0',
G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_NONE, &opt_version_only,
"Print version number (no other information) and exit.", NULL },
{ "with-host-graphics", '\0',
G_OPTION_FLAG_NO_ARG | G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_CALLBACK,
opt_with_host_graphics_cb,
"Deprecated alias for \"--graphics-provider=/\" or "
"\"--graphics-provider=/run/host\"", NULL },
{ "without-host-graphics", '\0',
G_OPTION_FLAG_NO_ARG | G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_CALLBACK,
opt_with_host_graphics_cb,
"Deprecated alias for \"--graphics-provider=\"", NULL },
{ "write-bwrap-arguments", '\0',
G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_FILENAME, &opt_write_bwrap,
"Write the final bwrap arguments, as null terminated strings, to the "
"given file path.", "PATH" },
{ "test", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_test,
"Smoke test pressure-vessel-wrap and exit.", NULL },
{ "only-prepare", '\0',
G_OPTION_FLAG_NONE, G_OPTION_ARG_NONE, &opt_only_prepare,
"Prepare runtime, but do not actually run anything.", NULL },
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[%d]: %s\n", (const char *) user_data, my_pid, message);
}
int
main (int argc,
char *argv[])
{
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;

Ludovico de Nittis
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gboolean is_flatpak_env = g_file_test ("/.flatpak-info", G_FILE_TEST_IS_REGULAR);
g_autoptr(FlatpakBwrap) bwrap = NULL;
g_autoptr(FlatpakBwrap) exports_bwrap = NULL;
g_autoptr(FlatpakExports) exports = NULL;
g_autoptr(FlatpakBwrap) adverb_args = NULL;
g_autofree gchar *adverb_in_container = NULL;
g_autoptr(FlatpakBwrap) wrapped_command = NULL;

Ludovico de Nittis
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g_autofree gchar *spawn_executable = NULL;
g_autofree gchar *bwrap_executable = NULL;
g_autoptr(GString) adjusted_ld_preload = g_string_new ("");
g_autofree gchar *cwd_p = NULL;
g_autofree gchar *cwd_l = NULL;
g_autofree gchar *cwd_p_host = NULL;
const gchar *home;
g_autofree gchar *bwrap_help = NULL;
g_autofree gchar *tools_dir = NULL;
const gchar *bwrap_help_argv[] = { "<bwrap>", "--help", NULL };
g_autoptr(PvRuntime) runtime = NULL;
g_autoptr(FILE) original_stdout = NULL;

Ludovico de Nittis
committed
const char * const known_required_env[] =
{
"STEAM_COMPAT_CLIENT_INSTALL_PATH",
"STEAM_COMPAT_DATA_PATH",
"STEAM_COMPAT_TOOL_PATH",
};
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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_batch = pv_boolean_environment ("PRESSURE_VESSEL_BATCH", FALSE);
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_remove_game_overlay = pv_boolean_environment ("PRESSURE_VESSEL_REMOVE_GAME_OVERLAY",
FALSE);
opt_share_home = tristate_environment ("PRESSURE_VESSEL_SHARE_HOME");
opt_gc_runtimes = pv_boolean_environment ("PRESSURE_VESSEL_GC_RUNTIMES", TRUE);
opt_generate_locales = pv_boolean_environment ("PRESSURE_VESSEL_GENERATE_LOCALES", TRUE);
opt_share_pid = pv_boolean_environment ("PRESSURE_VESSEL_SHARE_PID", TRUE);
opt_verbose = pv_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_copy_runtime_into == NULL)
opt_copy_runtime_into = g_strdup (g_getenv ("PRESSURE_VESSEL_COPY_RUNTIME_INTO"));
if (opt_copy_runtime_into != NULL
&& opt_copy_runtime_into[0] == '\0')
opt_copy_runtime_into = NULL;
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if (opt_graphics_provider == NULL)
opt_graphics_provider = g_strdup (g_getenv ("PRESSURE_VESSEL_GRAPHICS_PROVIDER"));
if (opt_graphics_provider == NULL)
{
/* Also check the deprecated 'PRESSURE_VESSEL_HOST_GRAPHICS' */
if (!pv_boolean_environment ("PRESSURE_VESSEL_HOST_GRAPHICS", TRUE))
opt_graphics_provider = g_strdup ("");
else if (g_file_test ("/run/host", G_FILE_TEST_IS_DIR))
opt_graphics_provider = g_strdup ("/run/host");
else
opt_graphics_provider = g_strdup ("/");
}
g_assert (opt_graphics_provider != NULL);
if (opt_graphics_provider[0] != '\0' && opt_graphics_provider[0] != '/')
{
g_printerr ("%s: --graphics-provider path must be absolute, not \"%s\"\n",
g_get_prgname (), opt_graphics_provider);
goto out;
}
if (g_strcmp0 (opt_graphics_provider, "/") == 0)
graphics_provider_mount_point = g_strdup ("/run/host");
else
graphics_provider_mount_point = g_strdup ("/run/gfx");
if (opt_version_only)
{
g_print ("%s\n", VERSION);
ret = 0;
goto out;
}
if (opt_version)
{
g_print ("%s:\n"
" Package: pressure-vessel\n"
" Version: %s\n",
argv[0], VERSION);
ret = 0;
goto out;
}
original_stdout = pv_divert_stdout_to_stderr (error);
if (original_stdout == NULL)
{
ret = 1;
goto out;
}
pv_avoid_gvfs ();
if (argc < 2 && !opt_test && !opt_only_prepare)
{
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 (opt_batch)
{
/* --batch or PRESSURE_VESSEL_BATCH=1 overrides these */
opt_shell = PV_SHELL_NONE;
opt_terminal = PV_TERMINAL_NONE;
}
if (argc > 1 && 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)
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{
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]);
goto out;
}
if (opt_only_prepare && opt_test)
{
g_printerr ("%s: --only-prepare and --test are mutually exclusive",
g_get_prgname ());
goto out;
}
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if (opt_filesystems != NULL)
{
for (i = 0; opt_filesystems[i] != NULL; i++)
{
if (strchr (opt_filesystems[i], ':') != NULL ||
strchr (opt_filesystems[i], '\\') != NULL)
{
g_printerr ("%s: ':' and '\\' in --filesystem argument "
"not handled yet\n",
g_get_prgname ());
goto out;
}
else if (!g_path_is_absolute (opt_filesystems[i]))
{
g_printerr ("%s: --filesystem argument must be an absolute "
"path, not \"%s\"\n",
g_get_prgname (), opt_filesystems[i]);
goto out;
}
}
}
/* 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);
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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);
for (i = 0; env[i] != NULL; i++)
{
g_autofree gchar *quoted = g_shell_quote (env[i]);
g_message ("\t%s", quoted);
}
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 (flatpak_bwrap_empty_env);
if (argc > 1 && 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);

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committed
/* If we are in a Flatpak environment we can't use bwrap directly */
if (is_flatpak_env)
{
g_debug ("Checking for flatpak-spawn...");
spawn_executable = check_flatpak_spawn ();
/* Assume "bwrap" to exist in the host system and to be in its PATH */
bwrap_executable = g_strdup ("bwrap");
}
else
{
g_debug ("Checking for bwrap...");
bwrap_executable = check_bwrap (tools_dir, opt_only_prepare);
}
if (opt_test)
{

Ludovico de Nittis
committed
if ((is_flatpak_env && spawn_executable == NULL)
|| bwrap_executable == NULL)
{
ret = 1;
goto out;
}
else
{

Ludovico de Nittis
committed
if (spawn_executable != NULL)
g_debug ("OK (%s) (%s)", spawn_executable, bwrap_executable);
else
g_debug ("OK (%s)", bwrap_executable);
ret = 0;
goto out;
}
}

Ludovico de Nittis
committed
if ((is_flatpak_env && spawn_executable == NULL)
|| bwrap_executable == NULL)

Ludovico de Nittis
committed
/* TODO in a Flatpak environment, host is not what we expect it to be */
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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;
}
}

Ludovico de Nittis
committed
if (!is_flatpak_env)
{
g_debug ("Checking bwrap features...");
bwrap_help_argv[0] = bwrap_executable;
bwrap_help = pv_capture_output (bwrap_help_argv, error);

Ludovico de Nittis
committed
if (bwrap_help == NULL)
goto out;
}
bwrap = flatpak_bwrap_new (NULL);
flatpak_bwrap_add_arg (bwrap, bwrap_executable);
exports = flatpak_exports_new ();
if (is_flatpak_env)
{
glnx_autofd int fd = TEMP_FAILURE_RETRY (open ("/run/host",
O_CLOEXEC | O_PATH));
if (fd < 0)
{
glnx_throw_errno_prefix (error, "Unable to open /run/host");
goto out;
}
flatpak_exports_take_host_fd (exports, glnx_steal_fd (&fd));
}
/* 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");
/* Start with just the root tmpfs (which appears automatically)
* and the standard API filesystems */
pv_bwrap_add_api_filesystems (bwrap);
/* The FlatpakExports will populate /run/host for us */
flatpak_exports_add_host_os_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_ONLY);
/* steam-runtime-system-info uses this to detect pressure-vessel, so we
* need to create it even if it will be empty */
flatpak_bwrap_add_args (bwrap,
"--dir",
"/run/pressure-vessel",
NULL);
if (opt_runtime != NULL && opt_runtime[0] != '\0')
PvRuntimeFlags flags = PV_RUNTIME_FLAGS_NONE;
if (opt_gc_runtimes)
flags |= PV_RUNTIME_FLAGS_GC_RUNTIMES;
if (opt_generate_locales)
flags |= PV_RUNTIME_FLAGS_GENERATE_LOCALES;
if (opt_graphics_provider != NULL && opt_graphics_provider[0] != '\0')
flags |= PV_RUNTIME_FLAGS_PROVIDER_GRAPHICS_STACK;
if (opt_verbose)
flags |= PV_RUNTIME_FLAGS_VERBOSE;
g_debug ("Configuring runtime %s...", opt_runtime);
runtime = pv_runtime_new (opt_runtime,
opt_copy_runtime_into,
bwrap_executable,
tools_dir,
opt_graphics_provider,
graphics_provider_mount_point,
goto out;
if (!pv_runtime_bind (runtime, bwrap, error))
else if (is_flatpak_env)
{
glnx_throw (error,
"Cannot operate without a runtime from inside a "
"Flatpak app");
goto out;
}
static const char * const export_os_mutable[] = { "/etc", "/tmp", "/var" };
g_assert (!is_flatpak_env);
if (!pv_bwrap_bind_usr (bwrap, "/", "/", "/", error))
goto out;
/* This mounts over the top of the subset of /etc mounted by
* pv_bwrap_bind_usr(), but that's harmless. */
for (i = 0; i < G_N_ELEMENTS (export_os_mutable); i++)
{
const char *dir = export_os_mutable[i];
if (g_file_test (dir, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap, "--bind", dir, dir, NULL);
}
/* We do each subdirectory of /run separately, so that we can
* always create /run/host and /run/pressure-vessel. */
if (!export_contents_of_run (bwrap, error))
goto out;
/* This handles everything except:
*
* /app (should be unnecessary)
* /boot (should be unnecessary)
* /dev (handled by pv_bwrap_add_api_filesystems() above)
* /etc (handled by export_os_mutable)
* /proc (handled by pv_bwrap_add_api_filesystems() above)
* /root (should be unnecessary)
* /run (handled by export_contents_of_run())
* /sys (handled by pv_bwrap_add_api_filesystems() above)
* /tmp (handled by export_os_mutable)
* /usr, /lib, /lib32, /lib64, /bin, /sbin
* (all handled by pv_bwrap_bind_usr() above)
* /var (handled by export_os_mutable)
*/
if (!export_root_dirs_like_filesystem_host (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
error))
}
/* 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);
g_debug ("Making home directory available...");
if (opt_fake_home == NULL)
{
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
home);
if (!use_fake_home (exports, bwrap, opt_fake_home, error))
goto out;
}
if (!opt_share_pid)
{
g_warning ("Unsharing process ID namespace. This is not expected "
"to work...");
flatpak_bwrap_add_arg (bwrap, "--unshare-pid");
}
/* Always export /tmp for now. SteamVR uses this as a rendezvous
* directory for IPC. */
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
"/tmp");
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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_remove_game_overlay
&& g_str_has_suffix (preload, "/gameoverlayrenderer.so"))
{
g_debug ("Disabling Steam Overlay: %s", preload);
continue;
}
&& (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. */
pv_search_path_append (adjusted_ld_preload, in_run_host);
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_ONLY,
preload);
pv_search_path_append (adjusted_ld_preload, preload);
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}
}
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);

Ludovico de Nittis
committed
g_debug ("Making Steam environment variables available if required...");
for (i = 0; i < G_N_ELEMENTS (known_required_env); i++)
bind_and_propagate_from_environ (exports, bwrap,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
known_required_env[i]);
/* Make arbitrary filesystems available. This is not as complete as
* Flatpak yet. */
if (opt_filesystems != NULL)
{
g_debug ("Processing --filesystem arguments...");
for (i = 0; opt_filesystems[i] != NULL; i++)
{
/* We already checked this */
g_assert (g_path_is_absolute (opt_filesystems[i]));
g_debug ("Bind-mounting \"%s\"", opt_filesystems[i]);
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
opt_filesystems[i]);
/* Make sure the current working directory (the game we are going to
* run) is available. Some games write here. */
g_debug ("Making current working directory available...");
cwd_p_host = pv_current_namespace_path_to_host_path (cwd_p);
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
{
/* If in Flatpak, we assume that cwd_p_host is visible in the
* current namespace as well as in the host, because it's
* either in our ~/.var/app/$FLATPAK_ID, or a --filesystem that
* was exposed from the host. */
flatpak_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_WRITE,
cwd_p_host);
flatpak_bwrap_add_args (bwrap,
"--chdir", cwd_p_host,
"--unsetenv", "PWD",
NULL);
/* Put Steam Runtime environment variables back, if /usr is mounted
* from the host. */
{
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_exports_add_path_expose (exports,
FLATPAK_FILESYSTEM_MODE_READ_ONLY,
equals + 1);
*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 = '=';
}
}
}
/* Convert the exported directories into extra bubblewrap arguments */
exports_bwrap = flatpak_bwrap_new (flatpak_bwrap_empty_env);
flatpak_exports_append_bwrap_args (exports, exports_bwrap);
adjust_exports (exports_bwrap, home);
flatpak_bwrap_append_bwrap (bwrap, exports_bwrap);
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/* We need to set up IPC rendezvous points relatively late, so that
* even if we are sharing /tmp via --filesystem=/tmp, we'll still
* mount our own /tmp/.X11-unix over the top of the OS's. */
if (runtime != NULL)
{
flatpak_run_add_wayland_args (bwrap);
/* When in a Flatpak container the "DISPLAY" env is equal to ":99.0",
* but it might be different on the host system. As a workaround we simply
* bind the whole "/tmp/.X11-unix" directory and unset the container
* "DISPLAY" env.
*/
if (g_file_test ("/.flatpak-info", G_FILE_TEST_IS_REGULAR))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/tmp/.X11-unix", "/tmp/.X11-unix",
NULL);
flatpak_bwrap_unset_env (bwrap, "DISPLAY");
}
else
{
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);
}
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;
adverb_args = flatpak_bwrap_new (flatpak_bwrap_empty_env);
adverb_in_container = pv_runtime_get_adverb (runtime, adverb_args);
if (opt_terminate_timeout >= 0.0)
{
if (opt_terminate_idle_timeout > 0.0)
flatpak_bwrap_add_arg_printf (adverb_args,
"--terminate-idle-timeout=%f",
opt_terminate_idle_timeout);
flatpak_bwrap_add_arg_printf (adverb_args,
"--terminate-timeout=%f",
opt_terminate_timeout);
}
/* If not using a runtime, the adverb in the container has the
* same path as outside */
if (adverb_in_container == NULL)
adverb_in_container = g_build_filename (tools_dir,
"pressure-vessel-adverb",
NULL);
flatpak_bwrap_add_args (bwrap,
adverb_in_container,
"--exit-with-parent",
"--subreaper",
NULL);
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switch (opt_shell)
{
case PV_SHELL_AFTER:
flatpak_bwrap_add_arg (bwrap, "--shell=after");
break;
case PV_SHELL_FAIL:
flatpak_bwrap_add_arg (bwrap, "--shell=fail");
break;
case PV_SHELL_INSTEAD:
flatpak_bwrap_add_arg (bwrap, "--shell=instead");
break;
case PV_SHELL_NONE:
flatpak_bwrap_add_arg (bwrap, "--shell=none");
break;
default:
g_warn_if_reached ();
}
switch (opt_terminal)
{
case PV_TERMINAL_AUTO:
flatpak_bwrap_add_arg (bwrap, "--terminal=auto");
break;
case PV_TERMINAL_NONE:
flatpak_bwrap_add_arg (bwrap, "--terminal=none");
break;
case PV_TERMINAL_TTY:
flatpak_bwrap_add_arg (bwrap, "--terminal=tty");
break;
case PV_TERMINAL_XTERM:
flatpak_bwrap_add_arg (bwrap, "--terminal=xterm");
break;
default:
g_warn_if_reached ();
break;
}
if (opt_verbose)
flatpak_bwrap_add_arg (bwrap, "--verbose");
flatpak_bwrap_append_bwrap (bwrap, adverb_args);
flatpak_bwrap_add_arg (bwrap, "--");
g_debug ("Adding wrapped command...");
flatpak_bwrap_append_args (bwrap, wrapped_command->argv);

Ludovico de Nittis
committed
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if (is_flatpak_env)
{
/* Just use the envp from @bwrap */
g_autoptr(FlatpakBwrap) flatpak_spawn = flatpak_bwrap_new (flatpak_bwrap_empty_env);
flatpak_bwrap_add_arg (flatpak_spawn, spawn_executable);
flatpak_bwrap_add_arg (flatpak_spawn, "--host");
for (i = 0; i < bwrap->fds->len; i++)
{
g_autofree char *fd_str = g_strdup_printf ("--forward-fd=%d",
g_array_index (bwrap->fds, int, i));
flatpak_bwrap_add_arg (flatpak_spawn, fd_str);
}
/* Change the current working directory where flatpak-spawn will run.
* Bwrap will then set its directory by itself. For this reason here
* we just need a directory that it's known to exist. */
flatpak_bwrap_add_arg (flatpak_spawn, "--directory=/");
flatpak_bwrap_append_bwrap (flatpak_spawn, bwrap);
g_clear_pointer (&bwrap, flatpak_bwrap_free);
bwrap = g_steal_pointer (&flatpak_spawn);
}
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);
}
/* Clean up temporary directory before running our long-running process */
if (runtime != NULL)
pv_runtime_cleanup (runtime);
flatpak_bwrap_finish (bwrap);
if (opt_write_bwrap != NULL)
{
FILE *file = fopen (opt_write_bwrap, "w");
if (file == NULL)
{
g_warning ("An error occurred trying to write the bwrap arguments: %s",
g_strerror (errno));
/* This is not a fatal error, try to continue */
}
else
{
for (i = 0; i < bwrap->argv->len; i++)
fprintf (file, "%s%c", (gchar *)g_ptr_array_index (bwrap->argv, i), '\0');
fclose (file);
}
}
if (opt_only_prepare)
ret = 0;
else
pv_bwrap_execve (bwrap, fileno (original_stdout), error);
out:
if (local_error != NULL)
g_warning ("%s", local_error->message);
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);
g_debug ("Exiting with status %d", ret);