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

   1 /* Testcase for bug in GIO function g_file_query_filesystem_info()
   2  * Author: Nelson Benítez León
   3  *
   4  * This work is provided "as is"; redistribution and modification
   5  * in whole or in part, in any medium, physical or electronic is
   6  * permitted without restriction.
   7  *
   8  * This work is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * In no event shall the authors or contributors be liable for any
  13  * direct, indirect, incidental, special, exemplary, or consequential
  14  * damages (including, but not limited to, procurement of substitute
  15  * goods or services; loss of use, data, or profits; or business
  16  * interruption) however caused and on any theory of liability, whether
  17  * in contract, strict liability, or tort (including negligence or
  18  * otherwise) arising in any way out of the use of this software, even
  19  * if advised of the possibility of such damage.
  20  */
  21
  22 #include <glib.h>
  23 #include <glib/gstdio.h>
  24 #include <gio/gio.h>
  25 #include <gio/gunixmounts.h>
  26
  27 static void
  28 test_filesystem_readonly (gconstpointer with_mount_monitor)
  29 {
  30   GFileInfo *file_info;
  31   GFile *mounted_file;
  32   GUnixMountMonitor *mount_monitor = NULL;
  33   gchar *bindfs, *fusermount;
  34   gchar *command_mount, *command_mount_ro, *command_umount;
  35   gchar *curdir, *dir_to_mount, *dir_mountpoint;
  36   gchar *file_in_mount, *file_in_mountpoint;
  37
  38   /* installed by package 'bindfs' in Fedora */
  39   bindfs = g_find_program_in_path ("bindfs");
  40
  41   /* installed by package 'fuse' in Fedora */
  42   fusermount = g_find_program_in_path ("fusermount");
  43
  44   if (bindfs == NULL || fusermount == NULL)
  45     {
  46       /* We need these because "mount --bind" requires root privileges */
  47       g_test_skip ("'bindfs' and 'fusermount' commands are needed to run this test");
  48       g_free (fusermount);
  49       g_free (bindfs);
  50       return;
  51     }
  52
  53   curdir = g_get_current_dir ();
  54   dir_to_mount = g_strdup_printf ("%s/dir_bindfs_to_mount", curdir);
  55   file_in_mount = g_strdup_printf ("%s/example.txt", dir_to_mount);
  56   dir_mountpoint = g_strdup_printf ("%s/dir_bindfs_mountpoint", curdir);
  57
  58   g_mkdir (dir_to_mount, 0777);
  59   g_mkdir (dir_mountpoint, 0777);
  60   if (! g_file_set_contents (file_in_mount, "Example", -1, NULL))
  61     {
  62       g_test_skip ("Failed to create file needed to proceed further with the test");
  63       return;
  64     }
  65
  66   if (with_mount_monitor)
  67     mount_monitor = g_unix_mount_monitor_get ();
  68
  69   /* Use bindfs, which does not need root privileges, to mount the contents of one dir
  70    * into another dir (and do the mount as readonly as per passed '-o ro' option) */
  71   command_mount_ro = g_strdup_printf ("%s -n -o ro '%s' '%s'", bindfs, dir_to_mount, dir_mountpoint);
  72   g_spawn_command_line_sync (command_mount_ro, NULL, NULL, NULL, NULL);
  73
  74   /* Let's check now, that the file is in indeed in a readonly filesystem */
  75   file_in_mountpoint = g_strdup_printf ("%s/example.txt", dir_mountpoint);
  76   mounted_file = g_file_new_for_path (file_in_mountpoint);
  77
  78   if (with_mount_monitor)
  79     {
  80      /* Let UnixMountMonitor process its 'mounts-changed'
  81       * signal triggered by mount operation above */
  82       while (g_main_context_iteration (NULL, FALSE));
  83     }
  84
  85   file_info = g_file_query_filesystem_info (mounted_file,
  86                                             G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, NULL);
  87   if (! g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY))
  88     {
  89       g_test_skip ("Failed to create readonly file needed to proceed further with the test");
  90       return;
  91     }
  92
  93   /* Now we unmount, and mount again but this time rw (not readonly) */
  94   command_umount = g_strdup_printf ("%s -u '%s'", fusermount, dir_mountpoint);
  95   g_spawn_command_line_sync (command_umount, NULL, NULL, NULL, NULL);
  96   command_mount = g_strdup_printf ("%s -n '%s' '%s'", bindfs, dir_to_mount, dir_mountpoint);
  97   g_spawn_command_line_sync (command_mount, NULL, NULL, NULL, NULL);
  98
  99   if (with_mount_monitor)
 100     {
 101      /* Let UnixMountMonitor process its 'mounts-changed' signal
 102       * triggered by mount/umount operations above */
 103       while (g_main_context_iteration (NULL, FALSE));
 104     }
 105
 106   /* Now let's test if GIO will report the new filesystem state */
 107   g_clear_object (&file_info);
 108   g_clear_object (&mounted_file);
 109   mounted_file = g_file_new_for_path (file_in_mountpoint);
 110   file_info = g_file_query_filesystem_info (mounted_file,
 111                                             G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, NULL);
 112
 113   if (g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY))
 114     {
 115       /* ¡¡ GIO still reports filesystem as being Readonly !!
 116        * Let's check if that's true by trying to write to file */
 117       GFileOutputStream *write_stream;
 118       write_stream = g_file_append_to (mounted_file, G_FILE_CREATE_NONE, NULL, NULL);
 119       if (write_stream != NULL)
 120         {
 121           /* The file has been opened for writing without error, so ¡¡ GIO IS WRONG !! */
 122           g_object_unref (write_stream);
 123           g_test_fail (); /* Marking test as FAILED */
 124         }
 125     }
 126
 127   /* Clean up */
 128   g_clear_object (&mount_monitor);
 129   g_clear_object (&file_info);
 130   g_clear_object (&mounted_file);
 131   g_spawn_command_line_sync (command_umount, NULL, NULL, NULL, NULL); /* unmount */
 132
 133   g_remove (file_in_mount);
 134   g_remove (dir_to_mount);
 135   g_remove (dir_mountpoint);
 136
 137   g_free (bindfs);
 138   g_free (fusermount);
 139   g_free (curdir);
 140   g_free (dir_to_mount);
 141   g_free (dir_mountpoint);
 142   g_free (command_mount);
 143   g_free (command_mount_ro);
 144   g_free (command_umount);
 145   g_free (file_in_mount);
 146   g_free (file_in_mountpoint);
 147 }
 148
 149 int
 150 main (int argc, char *argv[])
 151 {
 152   /* To avoid unnecessary D-Bus calls, see http://goo.gl/ir56j2 */
 153   g_setenv ("GIO_USE_VFS", "local", FALSE);
 154
 155   g_test_init (&argc, &argv, NULL);
 156
 157   g_test_bug_base ("http://bugzilla.gnome.org/");
 158   g_test_bug ("787731");
 159
 160   g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro",
 161                         GINT_TO_POINTER (FALSE), test_filesystem_readonly);
 162
 163   /* This second test is using a running GUnixMountMonitor, so the calls to:
 164    *  g_unix_mount_get(&time_read) - To fill the time_read parameter
 165    *  g_unix_mounts_changed_since()
 166    *
 167    * made from inside g_file_query_filesystem_info() will use the mount_poller_time
 168    * from the monitoring of /proc/self/mountinfo , while in the previous test new
 169    * created timestamps are returned from those g_unix_mount* functions. */
 170   g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro-with-mount-monitor",
 171                         GINT_TO_POINTER (TRUE), test_filesystem_readonly);
 172
 173   return g_test_run ();
 174 }