tests/test-file-block.c

   1 /* nbdkit
   2  * Copyright (C) 2013-2018 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   /* losetup must be available. */
  71   r = system ("losetup --version");
  72   if (r != 0) {
  73     fprintf (stderr, "%s: losetup program must be installed.\n",
  74              program_name);
  75     exit (77);
  76   }
  77
  78   /* Create the temporary backing disk. */
  79   fd = mkstemp (disk);
  80   if (fd == -1) {
  81     perror ("mkstemp");
  82     exit (EXIT_FAILURE);
  83   }
  84   if (ftruncate (fd, 100 * 1024 * 1024) == -1) {
  85     perror ("ftruncate");
  86     unlink (disk);
  87     exit (EXIT_FAILURE);
  88   }
  89
  90   /* Create the loopback device. */
  91   snprintf (cmd, sizeof cmd, "losetup -f --show %s", disk);
  92   pp = popen (cmd, "r");
  93   if (pp == NULL) {
  94     perror ("popen: losetup");
  95     unlink (disk);
  96     exit (EXIT_FAILURE);
  97   }
  98   if (fgets (buf, sizeof buf, pp) == NULL) {
  99     fprintf (stderr, "%s: could not read loop device name from losetup\n",
 100              program_name);
 101     unlink (disk);
 102     exit (EXIT_FAILURE);
 103   }
 104   len = strlen (buf);
 105   if (len > 0 && buf[len-1] == '\n') {
 106     buf[len-1] = '\0';
 107     len--;
 108   }
 109   pclose (pp);
 110
 111   /* We can delete the backing disk.  The loop device will hold it open. */
 112   unlink (disk);
 113
 114   /* If we get to this point, set up an atexit handler to detach the
 115    * loop device.
 116    */
 117   loopdev = malloc (len+1);
 118   if (loopdev == NULL) {
 119     perror ("malloc");
 120     exit (EXIT_FAILURE);
 121   }
 122   strcpy (loopdev, buf);
 123   atexit (detach_loopdev);
 124
 125   /* Start nbdkit. */
 126   if (test_start_nbdkit ("-D", "file.zero=1",
 127                          "file", loopdev, NULL) == -1)
 128     exit (EXIT_FAILURE);
 129
 130   g = guestfs_create ();
 131   if (g == NULL) {
 132     perror ("guestfs_create");
 133     exit (EXIT_FAILURE);
 134   }
 135
 136   r = guestfs_add_drive_opts (g, "",
 137                               GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw",
 138                               GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd",
 139                               GUESTFS_ADD_DRIVE_OPTS_SERVER, server,
 140                               -1);
 141   if (r == -1)
 142     exit (EXIT_FAILURE);
 143
 144   if (guestfs_launch (g) == -1)
 145     exit (EXIT_FAILURE);
 146
 147   /* Partition the disk. */
 148   if (guestfs_part_disk (g, "/dev/sda", "mbr") == -1)
 149     exit (EXIT_FAILURE);
 150   if (guestfs_mkfs (g, "ext4", "/dev/sda1") == -1)
 151     exit (EXIT_FAILURE);
 152
 153   if (guestfs_mount_options (g, "discard", "/dev/sda1", "/") == -1)
 154     exit (EXIT_FAILURE);
 155
 156 #define filename "/hello.txt"
 157 #define content "hello, people of the world"
 158
 159   if (guestfs_write (g, filename, content, strlen (content)) == -1)
 160     exit (EXIT_FAILURE);
 161
 162   data = guestfs_cat (g, filename);
 163   if (!data)
 164     exit (EXIT_FAILURE);
 165
 166   if (strcmp (data, content) != 0) {
 167     fprintf (stderr,
 168              "%s FAILED: unexpected content of %s file "
 169              "(actual: %s, expected: %s)\n",
 170              program_name, filename, data, content);
 171     exit (EXIT_FAILURE);
 172   }
 173
 174   /* Run sync to test flush path. */
 175   if (guestfs_sync (g) == -1)
 176     exit (EXIT_FAILURE);
 177
 178   /* Run fstrim to test trim path.  However only recent versions of
 179    * libguestfs have this, and it probably only works in recent
 180    * versions of qemu.
 181    */
 182 #ifdef GUESTFS_HAVE_FSTRIM
 183   if (guestfs_fstrim (g, "/", -1) == -1)
 184     exit (EXIT_FAILURE);
 185 #endif
 186
 187   /* Run fallocate(1) on the device to test zero path. */
 188   if (guestfs_umount (g, "/") == -1)
 189     exit (EXIT_FAILURE);
 190   const char *sh[] = { "fallocate", "-nzl", "64k", "/dev/sda", NULL };
 191   s = guestfs_debug (g, "sh", (char **) sh);
 192   free (s);
 193
 194   if (guestfs_shutdown (g) == -1)
 195     exit (EXIT_FAILURE);
 196
 197   guestfs_close (g);
 198
 199   /* The atexit handler should detach the loop device and clean up
 200    * the backing disk.
 201    */
 202   exit (EXIT_SUCCESS);
 203 }
 204
 205 /* atexit handler. */
 206 static void
 207 detach_loopdev (void)
 208 {
 209   char cmd[64];
 210
 211   if (loopdev == NULL)
 212     return;
 213
 214   snprintf (cmd, sizeof cmd, "losetup -d %s", loopdev);
 215 #pragma GCC diagnostic push
 216 #pragma GCC diagnostic ignored "-Wunused-result"
 217   system (cmd);
 218 #pragma GCC diagnostic pop
 219   free (loopdev);
 220   loopdev = NULL;
 221 }