tests/test-file-block.c

   1 /* nbdkit
   2  * Copyright (C) 2013-2020 Red Hat Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * * Neither the name of Red Hat nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <config.h>
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <stdint.h>
  38 #include <inttypes.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41 #include <sys/types.h>
  42
  43 #include <guestfs.h>
  44
  45 #include "test.h"
  46
  47 static char *loopdev;                   /* Name of the loop device. */
  48 static void detach_loopdev (void);
  49
  50 int
  51 main (int argc, char *argv[])
  52 {
  53   guestfs_h *g;
  54   int r;
  55   int fd;
  56   char cmd[64], buf[64];
  57   char disk[] = LARGE_TMPDIR "/diskXXXXXX"; /* Backing disk. */
  58   FILE *pp;
  59   char *data;
  60   size_t len;
  61   char *s;
  62
  63   /* This test can only be run as root, and will be skipped otherwise. */
  64   if (geteuid () != 0) {
  65     fprintf (stderr, "%s: this test has to be run as root.\n",
  66              program_name);
  67     exit (77);
  68   }
  69
  70   /* /dev/loop-control must be accessible. */
  71   r = access ("/dev/loop-control", W_OK);
  72   if (r != 0) {
  73     fprintf (stderr, "%s: /dev/loop-control is not writable.\n",
  74              program_name);
  75     exit (77);
  76   }
  77
  78   /* losetup must be available. */
  79   r = system ("losetup --version");
  80   if (r != 0) {
  81     fprintf (stderr, "%s: losetup program must be installed.\n",
  82              program_name);
  83     exit (77);
  84   }
  85
  86   /* Create the temporary backing disk. */
  87   fd = mkstemp (disk);
  88   if (fd == -1) {
  89     perror ("mkstemp");
  90     exit (EXIT_FAILURE);
  91   }
  92   if (ftruncate (fd, 100 * 1024 * 1024) == -1) {
  93     perror ("ftruncate");
  94     unlink (disk);
  95     exit (EXIT_FAILURE);
  96   }
  97
  98   /* Create the loopback device. */
  99   snprintf (cmd, sizeof cmd, "losetup -f --show %s", disk);
 100   pp = popen (cmd, "r");
 101   if (pp == NULL) {
 102     perror ("popen: losetup");
 103     unlink (disk);
 104     exit (EXIT_FAILURE);
 105   }
 106   if (fgets (buf, sizeof buf, pp) == NULL) {
 107     fprintf (stderr, "%s: could not read loop device name from losetup\n",
 108              program_name);
 109     unlink (disk);
 110     exit (EXIT_FAILURE);
 111   }
 112   len = strlen (buf);
 113   if (len > 0 && buf[len-1] == '\n') {
 114     buf[len-1] = '\0';
 115     len--;
 116   }
 117   pclose (pp);
 118
 119   /* We can delete the backing disk.  The loop device will hold it open. */
 120   unlink (disk);
 121
 122   /* If we get to this point, set up an atexit handler to detach the
 123    * loop device.
 124    */
 125   loopdev = malloc (len+1);
 126   if (loopdev == NULL) {
 127     perror ("malloc");
 128     exit (EXIT_FAILURE);
 129   }
 130   strcpy (loopdev, buf);
 131   atexit (detach_loopdev);
 132
 133   /* Start nbdkit. */
 134   if (test_start_nbdkit ("-D", "file.zero=1",
 135                          "file", loopdev, NULL) == -1)
 136     exit (EXIT_FAILURE);
 137
 138   g = guestfs_create ();
 139   if (g == NULL) {
 140     perror ("guestfs_create");
 141     exit (EXIT_FAILURE);
 142   }
 143
 144   r = guestfs_add_drive_opts (g, "",
 145                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
 146                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
 147                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
 148                               -1);
 149   if (r == -1)
 150     exit (EXIT_FAILURE);
 151
 152   if (guestfs_launch (g) == -1)
 153     exit (EXIT_FAILURE);
 154
 155   /* Partition the disk. */
 156   if (guestfs_part_disk (g, "/dev/sda", "mbr") == -1)
 157     exit (EXIT_FAILURE);
 158   if (guestfs_mkfs (g, "ext4", "/dev/sda1") == -1)
 159     exit (EXIT_FAILURE);
 160
 161   if (guestfs_mount_options (g, "discard", "/dev/sda1", "/") == -1)
 162     exit (EXIT_FAILURE);
 163
 164 #define filename "/hello.txt"
 165 #define content "hello, people of the world"
 166
 167   if (guestfs_write (g, filename, content, strlen (content)) == -1)
 168     exit (EXIT_FAILURE);
 169
 170   data = guestfs_cat (g, filename);
 171   if (!data)
 172     exit (EXIT_FAILURE);
 173
 174   if (strcmp (data, content) != 0) {
 175     fprintf (stderr,
 176              "%s FAILED: unexpected content of %s file "
 177              "(actual: %s, expected: %s)\n",
 178              program_name, filename, data, content);
 179     exit (EXIT_FAILURE);
 180   }
 181
 182   /* Run sync to test flush path. */
 183   if (guestfs_sync (g) == -1)
 184     exit (EXIT_FAILURE);
 185
 186   /* Run fstrim to test trim path.  However only recent versions of
 187    * libguestfs have this, and it probably only works in recent
 188    * versions of qemu.
 189    */
 190 #ifdef GUESTFS_HAVE_FSTRIM
 191   if (guestfs_fstrim (g, "/", -1) == -1)
 192     exit (EXIT_FAILURE);
 193 #endif
 194
 195   /* Run fallocate(1) on the device to test zero path. */
 196   if (guestfs_umount (g, "/") == -1)
 197     exit (EXIT_FAILURE);
 198   const char *sh[] = { "fallocate", "-nzl", "64k", "/dev/sda", NULL };
 199   s = guestfs_debug (g, "sh", (char **) sh);
 200   free (s);
 201
 202   if (guestfs_shutdown (g) == -1)
 203     exit (EXIT_FAILURE);
 204
 205   guestfs_close (g);
 206
 207   /* The atexit handler should detach the loop device and clean up
 208    * the backing disk.
 209    */
 210   exit (EXIT_SUCCESS);
 211 }
 212
 213 /* atexit handler. */
 214 static void
 215 detach_loopdev (void)
 216 {
 217   char cmd[64];
 218
 219   if (loopdev == NULL)
 220     return;
 221
 222   snprintf (cmd, sizeof cmd, "losetup -d %s", loopdev);
 223 #pragma GCC diagnostic push
 224 #pragma GCC diagnostic ignored "-Wunused-result"
 225   system (cmd);
 226 #pragma GCC diagnostic pop
 227   free (loopdev);
 228   loopdev = NULL;
 229 }