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flatpak-run.c
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flatpak-run.c
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/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
* Copyright © 2014-2019 Red Hat, Inc
*
* 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/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <gio/gdesktopappinfo.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <sys/personality.h>
#include <grp.h>
#include <unistd.h>
#include <gio/gunixfdlist.h>
#ifdef HAVE_DCONF
#include <dconf/dconf.h>
#endif
#ifdef HAVE_LIBMALCONTENT
#include <libmalcontent/malcontent.h>
#endif
#include "flatpak-syscalls-private.h"
#ifdef ENABLE_SECCOMP
#include <seccomp.h>
#endif
#include <glib/gi18n-lib.h>
#include <gio/gio.h>
#include "libglnx.h"
#include "flatpak-run-dbus-private.h"
#include "flatpak-run-private.h"
#include "flatpak-run-sockets-private.h"
#include "flatpak-utils-base-private.h"
#include "flatpak-dir-private.h"
#include "flatpak-instance-private.h"
#include "flatpak-systemd-dbus-generated.h"
#include "flatpak-document-dbus-generated.h"
#include "flatpak-error.h"
#include "session-helper/flatpak-session-helper.h"
#define DEFAULT_SHELL "/bin/sh"
static int
flatpak_extension_compare_by_path (gconstpointer _a,
gconstpointer _b)
{
const FlatpakExtension *a = _a;
const FlatpakExtension *b = _b;
return g_strcmp0 (a->directory, b->directory);
}
void
flatpak_run_extend_ld_path (FlatpakBwrap *bwrap,
const char *prepend,
const char *append)
{
g_autoptr(GString) ld_library_path = g_string_new (g_environ_getenv (bwrap->envp, "LD_LIBRARY_PATH"));
if (prepend != NULL && *prepend != '\0')
{
if (ld_library_path->len > 0)
g_string_prepend (ld_library_path, ":");
g_string_prepend (ld_library_path, prepend);
}
if (append != NULL && *append != '\0')
{
if (ld_library_path->len > 0)
g_string_append (ld_library_path, ":");
g_string_append (ld_library_path, append);
}
flatpak_bwrap_set_env (bwrap, "LD_LIBRARY_PATH", ld_library_path->str, TRUE);
}
gboolean
flatpak_run_add_extension_args (FlatpakBwrap *bwrap,
GKeyFile *metakey,
FlatpakDecomposed *ref,
gboolean use_ld_so_cache,
const char *target_path,
char **extensions_out,
char **ld_path_out,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GString) used_extensions = g_string_new ("");
GList *extensions, *path_sorted_extensions, *l;
g_autoptr(GString) ld_library_path = g_string_new ("");
int count = 0;
g_autoptr(GHashTable) mounted_tmpfs =
g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
g_autoptr(GHashTable) created_symlink =
g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
g_autofree char *arch = flatpak_decomposed_dup_arch (ref);
const char *branch = flatpak_decomposed_get_branch (ref);
g_return_val_if_fail (target_path != NULL, FALSE);
extensions = flatpak_list_extensions (metakey, arch, branch);
/* First we apply all the bindings, they are sorted alphabetically in order for parent directory
to be mounted before child directories */
path_sorted_extensions = g_list_copy (extensions);
path_sorted_extensions = g_list_sort (path_sorted_extensions, flatpak_extension_compare_by_path);
for (l = path_sorted_extensions; l != NULL; l = l->next)
{
FlatpakExtension *ext = l->data;
g_autofree char *directory = g_build_filename (target_path, ext->directory, NULL);
g_autofree char *full_directory = g_build_filename (directory, ext->subdir_suffix, NULL);
g_autofree char *ref_file = g_build_filename (full_directory, ".ref", NULL);
g_autofree char *real_ref = g_build_filename (ext->files_path, ext->directory, ".ref", NULL);
if (ext->needs_tmpfs)
{
g_autofree char *parent = g_path_get_dirname (directory);
if (g_hash_table_lookup (mounted_tmpfs, parent) == NULL)
{
flatpak_bwrap_add_args (bwrap,
"--tmpfs", parent,
NULL);
g_hash_table_insert (mounted_tmpfs, g_steal_pointer (&parent), "mounted");
}
}
flatpak_bwrap_add_args (bwrap,
"--ro-bind", ext->files_path, full_directory,
NULL);
if (g_file_test (real_ref, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap,
"--lock-file", ref_file,
NULL);
}
g_list_free (path_sorted_extensions);
/* Then apply library directories and file merging, in extension prio order */
for (l = extensions; l != NULL; l = l->next)
{
FlatpakExtension *ext = l->data;
g_autofree char *directory = g_build_filename (target_path, ext->directory, NULL);
g_autofree char *full_directory = g_build_filename (directory, ext->subdir_suffix, NULL);
int i;
if (used_extensions->len > 0)
g_string_append (used_extensions, ";");
g_string_append (used_extensions, ext->installed_id);
g_string_append (used_extensions, "=");
if (ext->commit != NULL)
g_string_append (used_extensions, ext->commit);
else
g_string_append (used_extensions, "local");
if (ext->add_ld_path)
{
g_autofree char *ld_path = g_build_filename (full_directory, ext->add_ld_path, NULL);
if (use_ld_so_cache)
{
g_autofree char *contents = g_strconcat (ld_path, "\n", NULL);
/* We prepend app or runtime and a counter in order to get the include order correct for the conf files */
g_autofree char *ld_so_conf_file = g_strdup_printf ("%s-%03d-%s.conf", flatpak_decomposed_get_kind_str (ref), ++count, ext->installed_id);
g_autofree char *ld_so_conf_file_path = g_build_filename ("/run/flatpak/ld.so.conf.d", ld_so_conf_file, NULL);
if (!flatpak_bwrap_add_args_data (bwrap, "ld-so-conf",
contents, -1, ld_so_conf_file_path, error))
return FALSE;
}
else
{
if (ld_library_path->len != 0)
g_string_append (ld_library_path, ":");
g_string_append (ld_library_path, ld_path);
}
}
for (i = 0; ext->merge_dirs != NULL && ext->merge_dirs[i] != NULL; i++)
{
g_autofree char *parent = g_path_get_dirname (directory);
g_autofree char *merge_dir = g_build_filename (parent, ext->merge_dirs[i], NULL);
g_autofree char *source_dir = g_build_filename (ext->files_path, ext->merge_dirs[i], NULL);
g_auto(GLnxDirFdIterator) source_iter = { 0 };
struct dirent *dent;
if (glnx_dirfd_iterator_init_at (AT_FDCWD, source_dir, TRUE, &source_iter, NULL))
{
while (glnx_dirfd_iterator_next_dent (&source_iter, &dent, NULL, NULL) && dent != NULL)
{
g_autofree char *symlink_path = g_build_filename (merge_dir, dent->d_name, NULL);
/* Only create the first, because extensions are listed in prio order */
if (g_hash_table_lookup (created_symlink, symlink_path) == NULL)
{
g_autofree char *symlink = g_build_filename (directory, ext->merge_dirs[i], dent->d_name, NULL);
flatpak_bwrap_add_args (bwrap,
"--symlink", symlink, symlink_path,
NULL);
g_hash_table_insert (created_symlink, g_steal_pointer (&symlink_path), "created");
}
}
}
}
}
g_list_free_full (extensions, (GDestroyNotify) flatpak_extension_free);
if (extensions_out)
*extensions_out = g_string_free (g_steal_pointer (&used_extensions), FALSE);
if (ld_path_out)
*ld_path_out = g_string_free (g_steal_pointer (&ld_library_path), FALSE);
return TRUE;
}
/*
* @per_app_dir_lock_fd: If >= 0, make use of per-app directories in
* the host's XDG_RUNTIME_DIR to share /tmp between instances.
*/
gboolean
flatpak_run_add_environment_args (FlatpakBwrap *bwrap,
const char *app_info_path,
FlatpakRunFlags flags,
const char *app_id,
FlatpakContext *context,
GFile *app_id_dir,
GPtrArray *previous_app_id_dirs,
int per_app_dir_lock_fd,
const char *instance_id,
FlatpakExports **exports_out,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GError) my_error = NULL;
g_autoptr(FlatpakExports) exports = NULL;
g_autoptr(FlatpakBwrap) proxy_arg_bwrap = flatpak_bwrap_new (flatpak_bwrap_empty_env);
g_autofree char *xdg_dirs_conf = NULL;
gboolean home_access = FALSE;
gboolean sandboxed = (flags & FLATPAK_RUN_FLAG_SANDBOX) != 0;
if ((context->shares & FLATPAK_CONTEXT_SHARED_IPC) == 0)
{
g_info ("Disallowing ipc access");
flatpak_bwrap_add_args (bwrap, "--unshare-ipc", NULL);
}
if ((context->shares & FLATPAK_CONTEXT_SHARED_NETWORK) == 0)
{
g_info ("Disallowing network access");
flatpak_bwrap_add_args (bwrap, "--unshare-net", NULL);
}
if (context->devices & FLATPAK_CONTEXT_DEVICE_ALL)
{
flatpak_bwrap_add_args (bwrap,
"--dev-bind", "/dev", "/dev",
NULL);
/* Don't expose the host /dev/shm, just the device nodes, unless explicitly allowed */
if (g_file_test ("/dev/shm", G_FILE_TEST_IS_DIR))
{
if (context->devices & FLATPAK_CONTEXT_DEVICE_SHM)
{
/* Don't do anything special: include shm in the
* shared /dev. The host and all sandboxes and subsandboxes
* all share /dev/shm */
}
else if ((context->features & FLATPAK_CONTEXT_FEATURE_PER_APP_DEV_SHM)
&& per_app_dir_lock_fd >= 0)
{
g_autofree char *shared_dev_shm = NULL;
/* The host and the original sandbox have separate /dev/shm,
* but we want other instances to be able to share /dev/shm with
* the first sandbox (except for subsandboxes run with
* flatpak-spawn --sandbox, which will have their own). */
if (!flatpak_instance_ensure_per_app_dev_shm (app_id,
per_app_dir_lock_fd,
&shared_dev_shm,
error))
return FALSE;
flatpak_bwrap_add_args (bwrap,
"--bind", shared_dev_shm, "/dev/shm",
NULL);
}
else
{
/* The host, the original sandbox and each subsandbox
* each have a separate /dev/shm. */
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/dev/shm",
NULL);
}
}
else if (g_file_test ("/dev/shm", G_FILE_TEST_IS_SYMLINK))
{
g_autofree char *link = flatpak_readlink ("/dev/shm", NULL);
/* On debian (with sysv init) the host /dev/shm is a symlink to /run/shm, so we can't
mount on top of it. */
if (g_strcmp0 (link, "/run/shm") == 0)
{
if (context->devices & FLATPAK_CONTEXT_DEVICE_SHM &&
g_file_test ("/run/shm", G_FILE_TEST_IS_DIR))
{
flatpak_bwrap_add_args (bwrap,
"--bind", "/run/shm", "/run/shm",
NULL);
}
else if ((context->features & FLATPAK_CONTEXT_FEATURE_PER_APP_DEV_SHM)
&& per_app_dir_lock_fd >= 0)
{
g_autofree char *shared_dev_shm = NULL;
/* The host and the original sandbox have separate /dev/shm,
* but we want other instances to be able to share /dev/shm,
* except for flatpak-spawn --subsandbox. */
if (!flatpak_instance_ensure_per_app_dev_shm (app_id,
per_app_dir_lock_fd,
&shared_dev_shm,
error))
return FALSE;
flatpak_bwrap_add_args (bwrap,
"--bind", shared_dev_shm, "/run/shm",
NULL);
}
else
{
flatpak_bwrap_add_args (bwrap,
"--dir", "/run/shm",
NULL);
}
}
else
g_warning ("Unexpected /dev/shm symlink %s", link);
}
}
else
{
flatpak_bwrap_add_args (bwrap,
"--dev", "/dev",
NULL);
if (context->devices & FLATPAK_CONTEXT_DEVICE_DRI)
{
g_info ("Allowing dri access");
int i;
char *dri_devices[] = {
"/dev/dri",
/* mali */
"/dev/mali",
"/dev/mali0",
"/dev/umplock",
/* nvidia */
"/dev/nvidiactl",
"/dev/nvidia-modeset",
/* nvidia OpenCL/CUDA */
"/dev/nvidia-uvm",
"/dev/nvidia-uvm-tools",
};
for (i = 0; i < G_N_ELEMENTS (dri_devices); i++)
{
if (g_file_test (dri_devices[i], G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap, "--dev-bind", dri_devices[i], dri_devices[i], NULL);
}
/* Each Nvidia card gets its own device.
This is a fairly arbitrary limit but ASUS sells mining boards supporting 20 in theory. */
char nvidia_dev[14]; /* /dev/nvidia plus up to 2 digits */
for (i = 0; i < 20; i++)
{
g_snprintf (nvidia_dev, sizeof (nvidia_dev), "/dev/nvidia%d", i);
if (g_file_test (nvidia_dev, G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap, "--dev-bind", nvidia_dev, nvidia_dev, NULL);
}
}
if (context->devices & FLATPAK_CONTEXT_DEVICE_INPUT)
{
g_info ("Allowing input device access. Note: raw and virtual input currently require --device=all");
if (g_file_test ("/dev/input", G_FILE_TEST_IS_DIR))
flatpak_bwrap_add_args (bwrap, "--dev-bind", "/dev/input", "/dev/input", NULL);
}
if (context->devices & FLATPAK_CONTEXT_DEVICE_KVM)
{
g_info ("Allowing kvm access");
if (g_file_test ("/dev/kvm", G_FILE_TEST_EXISTS))
flatpak_bwrap_add_args (bwrap, "--dev-bind", "/dev/kvm", "/dev/kvm", NULL);
}
if (context->devices & FLATPAK_CONTEXT_DEVICE_SHM)
{
/* This is a symlink to /run/shm on debian, so bind to real target */
g_autofree char *real_dev_shm = realpath ("/dev/shm", NULL);
g_info ("Allowing /dev/shm access (as %s)", real_dev_shm);
if (real_dev_shm != NULL)
flatpak_bwrap_add_args (bwrap, "--bind", real_dev_shm, "/dev/shm", NULL);
}
else if ((context->features & FLATPAK_CONTEXT_FEATURE_PER_APP_DEV_SHM)
&& per_app_dir_lock_fd >= 0)
{
g_autofree char *shared_dev_shm = NULL;
if (!flatpak_instance_ensure_per_app_dev_shm (app_id,
per_app_dir_lock_fd,
&shared_dev_shm,
error))
return FALSE;
flatpak_bwrap_add_args (bwrap,
"--bind", shared_dev_shm, "/dev/shm",
NULL);
}
}
exports = flatpak_context_get_exports_full (context,
app_id_dir, previous_app_id_dirs,
TRUE, TRUE,
&xdg_dirs_conf, &home_access);
if (flatpak_exports_path_is_visible (exports, "/tmp"))
{
/* The original sandbox and any subsandboxes are both already
* going to share /tmp with the host, so by transitivity they will
* also share it with each other, and with all other instances. */
}
else if (per_app_dir_lock_fd >= 0 && !sandboxed)
{
g_autofree char *shared_tmp = NULL;
/* The host and the original sandbox have separate /tmp,
* but we want other instances to be able to share /tmp with the
* first sandbox, unless they were created by
* flatpak-spawn --sandbox.
*
* In apply_extra and `flatpak build`, per_app_dir_lock_fd is
* negative and we skip this. */
if (!flatpak_instance_ensure_per_app_tmp (app_id,
per_app_dir_lock_fd,
&shared_tmp,
error))
return FALSE;
flatpak_bwrap_add_args (bwrap,
"--bind", shared_tmp, "/tmp",
NULL);
}
flatpak_context_append_bwrap_filesystem (context, bwrap, app_id, app_id_dir,
exports, xdg_dirs_conf, home_access);
flatpak_run_add_socket_args_environment (bwrap, context->shares, context->sockets, app_id, instance_id);
flatpak_run_add_session_dbus_args (bwrap, proxy_arg_bwrap, context, flags, app_id);
flatpak_run_add_system_dbus_args (bwrap, proxy_arg_bwrap, context, flags);
flatpak_run_add_a11y_dbus_args (bwrap, proxy_arg_bwrap, context, flags);
/* Must run this before spawning the dbus proxy, to ensure it
ends up in the app cgroup */
if (!flatpak_run_in_transient_unit (app_id, &my_error))
{
/* We still run along even if we don't get a cgroup, as nothing
really depends on it. Its just nice to have */
g_info ("Failed to run in transient scope: %s", my_error->message);
g_clear_error (&my_error);
}
if (!flatpak_run_maybe_start_dbus_proxy (bwrap, proxy_arg_bwrap,
app_info_path, error))
return FALSE;
if (exports_out)
*exports_out = g_steal_pointer (&exports);
return TRUE;
}
typedef struct
{
const char *env;
const char *val;
} ExportData;
static const ExportData default_exports[] = {
{"PATH", "/app/bin:/usr/bin"},
/* We always want to unset LD_LIBRARY_PATH to avoid inheriting weird
* dependencies from the host. But if not using ld.so.cache this is
* later set. */
{"LD_LIBRARY_PATH", NULL},
{"XDG_CONFIG_DIRS", "/app/etc/xdg:/etc/xdg"},
{"XDG_DATA_DIRS", "/app/share:/usr/share"},
{"SHELL", "/bin/sh"},
/* Unset temporary file paths as they may not exist in the sandbox */
{"TEMP", NULL},
{"TEMPDIR", NULL},
{"TMP", NULL},
{"TMPDIR", NULL},
/* We always use /run/user/UID, even if the user's XDG_RUNTIME_DIR
* outside the sandbox is somewhere else. Don't allow a different
* setting from outside the sandbox to overwrite this. */
{"XDG_RUNTIME_DIR", NULL},
/* Ensure our container environment variable takes precedence over the one
* set by a container manager. */
{"container", NULL},
/* Some env vars are common enough and will affect the sandbox badly
if set on the host. We clear these always. If updating this list,
also update the list in flatpak-run.xml. */
{"PYTHONPATH", NULL},
{"PERLLIB", NULL},
{"PERL5LIB", NULL},
{"XCURSOR_PATH", NULL},
{"GST_PLUGIN_PATH_1_0", NULL},
{"GST_REGISTRY", NULL},
{"GST_REGISTRY_1_0", NULL},
{"GST_PLUGIN_PATH", NULL},
{"GST_PLUGIN_SYSTEM_PATH", NULL},
{"GST_PLUGIN_SCANNER", NULL},
{"GST_PLUGIN_SCANNER_1_0", NULL},
{"GST_PLUGIN_SYSTEM_PATH_1_0", NULL},
{"GST_PRESET_PATH", NULL},
{"GST_PTP_HELPER", NULL},
{"GST_PTP_HELPER_1_0", NULL},
{"GST_INSTALL_PLUGINS_HELPER", NULL},
{"KRB5CCNAME", NULL},
{"XKB_CONFIG_ROOT", NULL},
{"GIO_EXTRA_MODULES", NULL},
{"GDK_BACKEND", NULL},
{"VK_DRIVER_FILES", NULL},
{"VK_ICD_FILENAMES", NULL},
};
static const ExportData no_ld_so_cache_exports[] = {
{"LD_LIBRARY_PATH", "/app/lib"},
};
static const ExportData devel_exports[] = {
{"ACLOCAL_PATH", "/app/share/aclocal"},
{"C_INCLUDE_PATH", "/app/include"},
{"CPLUS_INCLUDE_PATH", "/app/include"},
{"LDFLAGS", "-L/app/lib "},
{"PKG_CONFIG_PATH", "/app/lib/pkgconfig:/app/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig"},
{"LC_ALL", "en_US.utf8"},
};
static void
add_exports (GPtrArray *env_array,
const ExportData *exports,
gsize n_exports)
{
int i;
for (i = 0; i < n_exports; i++)
{
if (exports[i].val)
g_ptr_array_add (env_array, g_strdup_printf ("%s=%s", exports[i].env, exports[i].val));
}
}
char **
flatpak_run_get_minimal_env (gboolean devel, gboolean use_ld_so_cache)
{
GPtrArray *env_array;
static const char * const copy[] = {
"PWD",
"GDMSESSION",
"XDG_CURRENT_DESKTOP",
"XDG_SESSION_DESKTOP",
"DESKTOP_SESSION",
"EMAIL_ADDRESS",
"HOME",
"HOSTNAME",
"LOGNAME",
"REAL_NAME",
"TERM",
"USER",
"USERNAME",
};
static const char * const copy_nodevel[] = {
"LANG",
"LANGUAGE",
"LC_ALL",
"LC_ADDRESS",
"LC_COLLATE",
"LC_CTYPE",
"LC_IDENTIFICATION",
"LC_MEASUREMENT",
"LC_MESSAGES",
"LC_MONETARY",
"LC_NAME",
"LC_NUMERIC",
"LC_PAPER",
"LC_TELEPHONE",
"LC_TIME",
};
int i;
env_array = g_ptr_array_new_with_free_func (g_free);
add_exports (env_array, default_exports, G_N_ELEMENTS (default_exports));
if (!use_ld_so_cache)
add_exports (env_array, no_ld_so_cache_exports, G_N_ELEMENTS (no_ld_so_cache_exports));
if (devel)
add_exports (env_array, devel_exports, G_N_ELEMENTS (devel_exports));
for (i = 0; i < G_N_ELEMENTS (copy); i++)
{
const char *current = g_getenv (copy[i]);
if (current)
g_ptr_array_add (env_array, g_strdup_printf ("%s=%s", copy[i], current));
}
if (!devel)
{
for (i = 0; i < G_N_ELEMENTS (copy_nodevel); i++)
{
const char *current = g_getenv (copy_nodevel[i]);
if (current)
g_ptr_array_add (env_array, g_strdup_printf ("%s=%s", copy_nodevel[i], current));
}
}
g_ptr_array_add (env_array, NULL);
return (char **) g_ptr_array_free (env_array, FALSE);
}
static char **
apply_exports (char **envp,
const ExportData *exports,
gsize n_exports)
{
int i;
for (i = 0; i < n_exports; i++)
{
const char *value = exports[i].val;
if (value)
envp = g_environ_setenv (envp, exports[i].env, value, TRUE);
else
envp = g_environ_unsetenv (envp, exports[i].env);
}
return envp;
}
void
flatpak_run_apply_env_default (FlatpakBwrap *bwrap, gboolean use_ld_so_cache)
{
bwrap->envp = apply_exports (bwrap->envp, default_exports, G_N_ELEMENTS (default_exports));
if (!use_ld_so_cache)
bwrap->envp = apply_exports (bwrap->envp, no_ld_so_cache_exports, G_N_ELEMENTS (no_ld_so_cache_exports));
}
static void
flatpak_run_apply_env_prompt (FlatpakBwrap *bwrap, const char *app_id)
{
/* A custom shell prompt. FLATPAK_ID is always set.
* PS1 can be overwritten by runtime metadata or by --env overrides
*/
flatpak_bwrap_set_env (bwrap, "FLATPAK_ID", app_id, TRUE);
flatpak_bwrap_set_env (bwrap, "PS1", "[📦 $FLATPAK_ID \\W]\\$ ", FALSE);
}
void
flatpak_run_apply_env_vars (FlatpakBwrap *bwrap, FlatpakContext *context)
{
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init (&iter, context->env_vars);
while (g_hash_table_iter_next (&iter, &key, &value))
{
const char *var = key;
const char *val = value;
if (val)
flatpak_bwrap_set_env (bwrap, var, val, TRUE);
else
flatpak_bwrap_unset_env (bwrap, var);
}
}
gboolean
flatpak_ensure_data_dir (GFile *app_id_dir,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GFile) data_dir = g_file_get_child (app_id_dir, "data");
g_autoptr(GFile) cache_dir = g_file_get_child (app_id_dir, "cache");
g_autoptr(GFile) fontconfig_cache_dir = g_file_get_child (cache_dir, "fontconfig");
g_autoptr(GFile) tmp_dir = g_file_get_child (cache_dir, "tmp");
g_autoptr(GFile) config_dir = g_file_get_child (app_id_dir, "config");
g_autoptr(GFile) state_dir = g_file_get_child (app_id_dir, ".local/state");
if (!flatpak_mkdir_p (data_dir, cancellable, error))
return FALSE;
if (!flatpak_mkdir_p (cache_dir, cancellable, error))
return FALSE;
if (!flatpak_mkdir_p (fontconfig_cache_dir, cancellable, error))
return FALSE;
if (!flatpak_mkdir_p (tmp_dir, cancellable, error))
return FALSE;
if (!flatpak_mkdir_p (config_dir, cancellable, error))
return FALSE;
if (!flatpak_mkdir_p (state_dir, cancellable, error))
return FALSE;
return TRUE;
}
struct JobData
{
char *job;
GMainLoop *main_loop;
};
static void
job_removed_cb (SystemdManager *manager,
guint32 id,
char *job,
char *unit,
char *result,
struct JobData *data)
{
if (strcmp (job, data->job) == 0)
g_main_loop_quit (data->main_loop);
}
static gchar *
systemd_unit_name_escape (const gchar *in)
{
/* Adapted from systemd source */
GString * const str = g_string_sized_new (strlen (in));
for (; *in; in++)
{
if (g_ascii_isalnum (*in) || *in == ':' || *in == '_' || *in == '.')
g_string_append_c (str, *in);
else
g_string_append_printf (str, "\\x%02x", *in);
}
return g_string_free (str, FALSE);
}
gboolean
flatpak_run_in_transient_unit (const char *appid, GError **error)
{
g_autoptr(GDBusConnection) conn = NULL;
g_autofree char *path = NULL;
g_autofree char *address = NULL;
g_autofree char *name = NULL;
g_autofree char *appid_escaped = NULL;
g_autofree char *job = NULL;
SystemdManager *manager = NULL;
GVariantBuilder builder;
GVariant *properties = NULL;
GVariant *aux = NULL;
guint32 pid;
GMainLoop *main_loop = NULL;
struct JobData data;
gboolean res = FALSE;
g_autoptr(GMainContextPopDefault) main_context = NULL;
path = g_strdup_printf ("/run/user/%d/systemd/private", getuid ());
if (!g_file_test (path, G_FILE_TEST_EXISTS))
return flatpak_fail_error (error, FLATPAK_ERROR_SETUP_FAILED,
_("No systemd user session available, cgroups not available"));
main_context = flatpak_main_context_new_default ();
main_loop = g_main_loop_new (main_context, FALSE);
address = g_strconcat ("unix:path=", path, NULL);
conn = g_dbus_connection_new_for_address_sync (address,
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
NULL,
NULL, error);
if (!conn)
goto out;
manager = systemd_manager_proxy_new_sync (conn,
G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
NULL,
"/org/freedesktop/systemd1",
NULL, error);
if (!manager)
goto out;
appid_escaped = systemd_unit_name_escape (appid);
name = g_strdup_printf ("app-flatpak-%s-%d.scope", appid_escaped, getpid ());
g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(sv)"));
pid = getpid ();
g_variant_builder_add (&builder, "(sv)",
"PIDs",
g_variant_new_fixed_array (G_VARIANT_TYPE ("u"),
&pid, 1, sizeof (guint32))
);
properties = g_variant_builder_end (&builder);
aux = g_variant_new_array (G_VARIANT_TYPE ("(sa(sv))"), NULL, 0);
if (!systemd_manager_call_start_transient_unit_sync (manager,
name,
"fail",
properties,
aux,
&job,
NULL,
error))
goto out;
data.job = job;
data.main_loop = main_loop;
g_signal_connect (manager, "job-removed", G_CALLBACK (job_removed_cb), &data);
g_main_loop_run (main_loop);
res = TRUE;
out:
if (main_loop)
g_main_loop_unref (main_loop);
if (manager)
g_object_unref (manager);
return res;
}
static void
add_font_path_args (FlatpakBwrap *bwrap)
{
g_autoptr(GString) xml_snippet = g_string_new ("");
gchar *path_build_tmp = NULL;
g_autoptr(GFile) user_font1 = NULL;
g_autoptr(GFile) user_font2 = NULL;
g_autoptr(GFile) user_font_cache = NULL;
g_auto(GStrv) system_cache_dirs = NULL;
gboolean found_cache = FALSE;
int i;
g_string_append (xml_snippet,
"<?xml version=\"1.0\"?>\n"
"<!DOCTYPE fontconfig SYSTEM \"urn:fontconfig:fonts.dtd\">\n"
"<fontconfig>\n");
if (g_file_test (SYSTEM_FONTS_DIR, G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", SYSTEM_FONTS_DIR, "/run/host/fonts",
NULL);
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/fonts</remap-dir>\n",
SYSTEM_FONTS_DIR);
}
if (g_file_test ("/usr/local/share/fonts", G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", "/usr/local/share/fonts", "/run/host/local-fonts",
NULL);
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/local-fonts</remap-dir>\n",
"/usr/local/share/fonts");
}
system_cache_dirs = g_strsplit (SYSTEM_FONT_CACHE_DIRS, ":", 0);
for (i = 0; system_cache_dirs[i] != NULL; i++)
{
if (g_file_test (system_cache_dirs[i], G_FILE_TEST_EXISTS))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", system_cache_dirs[i], "/run/host/fonts-cache",
NULL);
found_cache = TRUE;
break;
}
}
if (!found_cache)
{
/* We ensure these directories are never writable, or fontconfig
will use them to write the default cache */
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/run/host/fonts-cache",
"--remount-ro", "/run/host/fonts-cache",
NULL);
}
path_build_tmp = g_build_filename (g_get_user_data_dir (), "fonts", NULL);
user_font1 = g_file_new_for_path (path_build_tmp);
g_clear_pointer (&path_build_tmp, g_free);
path_build_tmp = g_build_filename (g_get_home_dir (), ".fonts", NULL);
user_font2 = g_file_new_for_path (path_build_tmp);
g_clear_pointer (&path_build_tmp, g_free);
if (g_file_query_exists (user_font1, NULL))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", flatpak_file_get_path_cached (user_font1), "/run/host/user-fonts",
NULL);
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/user-fonts</remap-dir>\n",
flatpak_file_get_path_cached (user_font1));
}
else if (g_file_query_exists (user_font2, NULL))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", flatpak_file_get_path_cached (user_font2), "/run/host/user-fonts",
NULL);
g_string_append_printf (xml_snippet,
"\t<remap-dir as-path=\"%s\">/run/host/user-fonts</remap-dir>\n",
flatpak_file_get_path_cached (user_font2));
}
path_build_tmp = g_build_filename (g_get_user_cache_dir (), "fontconfig", NULL);
user_font_cache = g_file_new_for_path (path_build_tmp);
g_clear_pointer (&path_build_tmp, g_free);
if (g_file_query_exists (user_font_cache, NULL))
{
flatpak_bwrap_add_args (bwrap,
"--ro-bind", flatpak_file_get_path_cached (user_font_cache), "/run/host/user-fonts-cache",
NULL);
}
else
{
/* We ensure these directories are never writable, or fontconfig
will use them to write the default cache */
flatpak_bwrap_add_args (bwrap,
"--tmpfs", "/run/host/user-fonts-cache",
"--remount-ro", "/run/host/user-fonts-cache",
NULL);
}
g_string_append (xml_snippet,
"</fontconfig>\n");
if (!flatpak_bwrap_add_args_data (bwrap, "font-dirs.xml", xml_snippet->str, xml_snippet->len, "/run/host/font-dirs.xml", NULL))
g_warning ("Unable to add fontconfig data snippet");
}
static void
add_icon_path_args (FlatpakBwrap *bwrap)
{
g_autofree gchar *user_icons_path = NULL;
g_autoptr(GFile) user_icons = NULL;
if (g_file_test ("/usr/share/icons", G_FILE_TEST_IS_DIR))
{
flatpak_bwrap_add_args (bwrap,