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       return;
  49     }
  50
  51   curdir = g_get_current_dir ();
  52   dir_to_mount = g_strdup_printf ("%s/dir_bindfs_to_mount", curdir);
  53   file_in_mount = g_strdup_printf ("%s/example.txt", dir_to_mount);
  54   dir_mountpoint = g_strdup_printf ("%s/dir_bindfs_mountpoint", curdir);
  55
  56   g_mkdir (dir_to_mount, 0777);
  57   g_mkdir (dir_mountpoint, 0777);
  58   if (! g_file_set_contents (file_in_mount, "Example", -1, NULL))
  59     {
  60       g_test_skip ("Failed to create file needed to proceed further with the test");
  61       return;
  62     }
  63
  64   if (with_mount_monitor)
  65     mount_monitor = g_unix_mount_monitor_get ();
  66
  67   /* Use bindfs, which does not need root privileges, to mount the contents of one dir
  68    * into another dir (and do the mount as readonly as per passed '-o ro' option) */
  69   command_mount_ro = g_strdup_printf ("%s -n -o ro '%s' '%s'", bindfs, dir_to_mount, dir_mountpoint);
  70   g_spawn_command_line_sync (command_mount_ro, NULL, NULL, NULL, NULL);
  71
  72   /* Let's check now, that the file is in indeed in a readonly filesystem */
  73   file_in_mountpoint = g_strdup_printf ("%s/example.txt", dir_mountpoint);
  74   mounted_file = g_file_new_for_path (file_in_mountpoint);
  75
  76   if (with_mount_monitor)
  77     {
  78      /* Let UnixMountMonitor process its 'mounts-changed'
  79       * signal triggered by mount operation above */
  80       while (g_main_context_iteration (NULL, FALSE));
  81     }
  82
  83   file_info = g_file_query_filesystem_info (mounted_file,
  84                                             G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, NULL);
  85   if (! g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY))
  86     {
  87       g_test_skip ("Failed to create readonly file needed to proceed further with the test");
  88       return;
  89     }
  90
  91   /* Now we unmount, and mount again but this time rw (not readonly) */
  92   command_umount = g_strdup_printf ("%s -u '%s'", fusermount, dir_mountpoint);
  93   g_spawn_command_line_sync (command_umount, NULL, NULL, NULL, NULL);
  94   command_mount = g_strdup_printf ("%s -n '%s' '%s'", bindfs, dir_to_mount, dir_mountpoint);
  95   g_spawn_command_line_sync (command_mount, NULL, NULL, NULL, NULL);
  96
  97   if (with_mount_monitor)
  98     {
  99      /* Let UnixMountMonitor process its 'mounts-changed' signal
 100       * triggered by mount/umount operations above */
 101       while (g_main_context_iteration (NULL, FALSE));
 102     }
 103
 104   /* Now let's test if GIO will report the new filesystem state */
 105   g_clear_object (&file_info);
 106   g_clear_object (&mounted_file);
 107   mounted_file = g_file_new_for_path (file_in_mountpoint);
 108   file_info = g_file_query_filesystem_info (mounted_file,
 109                                             G_FILE_ATTRIBUTE_FILESYSTEM_READONLY, NULL, NULL);
 110
 111   if (g_file_info_get_attribute_boolean (file_info, G_FILE_ATTRIBUTE_FILESYSTEM_READONLY))
 112     {
 113       /* ¡¡ GIO still reports filesystem as being Readonly !!
 114        * Let's check if that's true by trying to write to file */
 115       GFileOutputStream *write_stream;
 116       write_stream = g_file_append_to (mounted_file, G_FILE_CREATE_NONE, NULL, NULL);
 117       if (write_stream != NULL)
 118         {
 119           /* The file has been opened for writing without error, so ¡¡ GIO IS WRONG !! */
 120           g_object_unref (write_stream);
 121           g_test_fail (); /* Marking test as FAILED */
 122         }
 123     }
 124
 125   /* Clean up */
 126   g_clear_object (&mount_monitor);
 127   g_clear_object (&file_info);
 128   g_clear_object (&mounted_file);
 129   g_spawn_command_line_sync (command_umount, NULL, NULL, NULL, NULL); /* unmount */
 130
 131   g_remove (file_in_mount);
 132   g_remove (dir_to_mount);
 133   g_remove (dir_mountpoint);
 134
 135   g_free (bindfs);
 136   g_free (fusermount);
 137   g_free (curdir);
 138   g_free (dir_to_mount);
 139   g_free (dir_mountpoint);
 140   g_free (command_mount);
 141   g_free (command_mount_ro);
 142   g_free (command_umount);
 143   g_free (file_in_mount);
 144   g_free (file_in_mountpoint);
 145 }
 146
 147 int
 148 main (int argc, char *argv[])
 149 {
 150   /* To avoid unnecessary D-Bus calls, see http://goo.gl/ir56j2 */
 151   g_setenv ("GIO_USE_VFS", "local", FALSE);
 152
 153   g_test_init (&argc, &argv, NULL);
 154
 155   g_test_bug_base ("http://bugzilla.gnome.org/");
 156   g_test_bug ("787731");
 157
 158   g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro",
 159                         GINT_TO_POINTER (FALSE), test_filesystem_readonly);
 160
 161   /* This second test is using a running GUnixMountMonitor, so the calls to:
 162    *  g_unix_mount_get(&time_read) - To fill the time_read parameter
 163    *  g_unix_mounts_changed_since()
 164    *
 165    * made from inside g_file_query_filesystem_info() will use the mount_poller_time
 166    * from the monitoring of /proc/self/mountinfo , while in the previous test new
 167    * created timestamps are returned from those g_unix_mount* functions. */
 168   g_test_add_data_func ("/g-file-info-filesystem-readonly/test-fs-ro-with-mount-monitor",
 169                         GINT_TO_POINTER (TRUE), test_filesystem_readonly);
 170
 171   return g_test_run ();
 172 }