glib/gio/tests/g-file-info-filesystem-readonly.c

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/* Testcase for bug in GIO function g_file_query_filesystem_info()
* Author: Nelson Benítez León
*
* SPDX-License-Identifier: LicenseRef-old-glib-tests
*
* This work is provided "as is"; redistribution and modification
* in whole or in part, in any medium, physical or electronic is
* permitted without restriction.
*
* This work 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.
*
* In no event shall the authors or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*/
#include <errno.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#include <gio/gunixmounts.h>
static gboolean
run (GError **error,
const gchar *argv0,
...)
{
GPtrArray *args;
const gchar *arg;
va_list ap;
GSubprocess *subprocess;
gchar *command_line = NULL;
gboolean success;
args = g_ptr_array_new ();
va_start (ap, argv0);
g_ptr_array_add (args, (gchar *) argv0);
while ((arg = va_arg (ap, const gchar *)))
g_ptr_array_add (args, (gchar *) arg);
g_ptr_array_add (args, NULL);
va_end (ap);
command_line = g_strjoinv (" ", (gchar **) args->pdata);
g_test_message ("Running command `%s`", command_line);
g_free (command_line);
subprocess = g_subprocess_newv ((const gchar * const *) args->pdata, G_SUBPROCESS_FLAGS_NONE, error);
g_ptr_array_free (args, TRUE);
if (subprocess == NULL)
return FALSE;
success = g_subprocess_wait_check (subprocess, NULL, error);
g_object_unref (subprocess);
return success;
}
static void
assert_remove (const gchar *file)
{
if (g_remove (file) != 0)
g_error ("failed to remove %s: %s", file, g_strerror (errno));
}
static gboolean
fuse_module_loaded (void)
{
char *contents = NULL;
gboolean ret;
if (!g_file_get_contents ("/proc/modules", &contents, NULL, NULL) ||
contents == NULL)
{
g_free (contents);
return FALSE;
}
ret = (strstr (contents, "\nfuse ") != NULL);
g_free (contents);
return ret;
}
static void
test_filesystem_readonly (gconstpointer with_mount_monitor)
{
GFileInfo *file_info;
GFile *mounted_file;
GUnixMountMonitor *mount_monitor = NULL;
gchar *bindfs, *fusermount;
gchar *curdir, *dir_to_mount, *dir_mountpoint;
gchar *file_in_mount, *file_in_mountpoint;
GError *error = NULL;
/* installed by package 'bindfs' in Fedora */
bindfs = g_find_program_in_path ("bindfs");
/* installed by package 'fuse' in Fedora */
fusermount = g_find_program_in_path ("fusermount");
if (bindfs == NULL || fusermount == NULL)
{
/* We need these because "mount --bind" requires root privileges */
g_test_skip ("'bindfs' and 'fusermount' commands are needed to run this test");
g_free (fusermount);
g_free (bindfs);
return;
}
/* If the fuse module is loaded but there's no /dev/fuse, then we're
* we're probably in a rootless container and won't be able to
* use bindfs to run our tests */
if (fuse_module_loaded () &&
!g_file_test ("/dev/fuse", G_FILE_TEST_EXISTS))
{
g_test_skip ("fuse support is needed to run this test (rootless container?)");
g_free (fusermount);
g_free (bindfs);
return;
}
curdir = g_get_current_dir ();
dir_to_mount = g_strdup_printf ("%s/dir_bindfs_to_mount", curdir);
file_in_mount = g_strdup_printf ("%s/example.txt", dir_to_mount);
dir_mountpoint = g_strdup_printf ("%s/dir_bindfs_mountpoint", curdir);
g_mkdir (dir_to_mount, 0777);
g_mkdir (dir_mountpoint, 0777);
if (! g_file_set_contents (file_in_mount, "Example", -1, NULL))
{
g_test_skip ("Failed to create file needed to proceed further with the test");
g_free (dir_mountpoint);
g_free (file_in_mount);
g_free (dir_to_mount);
g_free (curdir);
g_free (fusermount);
g_free (bindfs);
return;
}
if (with_mount_monitor)
mount_monitor = g_unix_mount_monitor_get ();
/* Use bindfs, which does not need root privileges, to mount the contents of one dir
* into another dir (and do the mount as readonly as per passed '-o ro' option) */
if (!run (&error, bindfs, "-n", "-o", "ro", dir_to_mount, dir_mountpoint, NULL))
{
gchar *skip_message = g_strdup_printf ("Failed to run bindfs to set up test: %s", error->message);
g_test_skip (skip_message);
g_free (skip_message);
g_clear_error (&error);
g_clear_object (&mount_monitor);
g_free (dir_mountpoint);
g_free (file_in_mount);
g_free (dir_to_mount);
g_free (curdir);
g_free (fusermount);
g_free (bindfs);
return;
}
/* Let's check now, that the file is in indeed in a readonly filesystem */
file_in_mountpoint = g_strdup_printf ("%s/example.txt", dir_mountpoint);
mounted_file = g_file_new_for_path (file_in_mountpoint);
if (with_mount_monitor)
{
/* Let UnixMountMonitor process its 'mounts-changed'
* signal triggered by mount operation above */
while (g_main_context_iteration (NULL, FALSE));
}
file_info = g_file_query_filesystem_info (mounted_file,
G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, &error);
g_assert_no_error (error);
g_assert_nonnull (file_info);
if (! g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY))
{
g_test_skip ("Failed to create readonly file needed to proceed further with the test");
g_clear_object (&file_info);
g_clear_object (&mounted_file);
g_free (file_in_mountpoint);
g_clear_object (&mount_monitor);
g_free (dir_mountpoint);
g_free (file_in_mount);
g_free (dir_to_mount);
g_free (curdir);
g_free (fusermount);
g_free (bindfs);
return;
}
/* Now we unmount, and mount again but this time rw (not readonly) */
run (&error, fusermount, "-z", "-u", dir_mountpoint, NULL);
g_assert_no_error (error);
run (&error, bindfs, "-n", dir_to_mount, dir_mountpoint, NULL);
g_assert_no_error (error);
if (with_mount_monitor)
{
/* Let UnixMountMonitor process its 'mounts-changed' signal
* triggered by mount/umount operations above */
while (g_main_context_iteration (NULL, FALSE));
}
/* Now let's test if GIO will report the new filesystem state */
g_clear_object (&file_info);
g_clear_object (&mounted_file);
mounted_file = g_file_new_for_path (file_in_mountpoint);
file_info = g_file_query_filesystem_info (mounted_file,
G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, &error);
g_assert_no_error (error);
g_assert_nonnull (file_info);
g_assert_false (g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY));
/* Clean up */
g_clear_object (&mount_monitor);
g_clear_object (&file_info);
g_clear_object (&mounted_file);
run (&error, fusermount, "-z", "-u", dir_mountpoint, NULL);
g_assert_no_error (error);
assert_remove (file_in_mount);
assert_remove (dir_to_mount);
assert_remove (dir_mountpoint);
g_free (bindfs);
g_free (fusermount);
g_free (curdir);
g_free (dir_to_mount);
g_free (dir_mountpoint);
g_free (file_in_mount);
g_free (file_in_mountpoint);
}
int
main (int argc, char *argv[])
{
/* To avoid unnecessary D-Bus calls, see http://goo.gl/ir56j2 */
g_setenv ("GIO_USE_VFS", "local", FALSE);
g_test_init (&argc, &argv, NULL);
g_test_bug ("https://bugzilla.gnome.org/show_bug.cgi?id=787731");
g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro",
GINT_TO_POINTER (FALSE), test_filesystem_readonly);
/* This second test is using a running GUnixMountMonitor, so the calls to:
* g_unix_mount_get(&time_read) - To fill the time_read parameter
* g_unix_mounts_changed_since()
*
* made from inside g_file_query_filesystem_info() will use the mount_poller_time
* from the monitoring of /proc/self/mountinfo , while in the previous test new
* created timestamps are returned from those g_unix_mount* functions. */
g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro-with-mount-monitor",
GINT_TO_POINTER (TRUE), test_filesystem_readonly);
return g_test_run ();
}