dir-vine.c

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/** Create a very deep "vine" of directories: /dir0/dir1/dir2/...
   and an ordinary file in each of them, until we fill up the
   disk.
   
   Then delete most of them, for two reasons.  First, "tar"
   limits file names to 100 characters (which could be extended
   to 256 without much trouble).  Second, a full disk has no room
   for the tar archive. */
 
#include <string.h>
#include <stdio.h>
#include <syscall.h>
#include "tests/lib.h"
#include "tests/main.h"
 
void
test_main (void) 
{
  int i;
 
  msg ("creating many levels of files and directories...");
  quiet = true;
  CHECK (mkdir ("start"), "mkdir \"start\"");
  CHECK (chdir ("start"), "chdir \"start\"");
  for (i = 0; ; i++) 
    {
      char name[3][READDIR_MAX_LEN + 1];
      char file_name[16], dir_name[16];
      char contents[128];
      int fd;
 
      /* Create file. */
      snprintf (file_name, sizeof file_name, "file%d", i);
      if (!create (file_name, 0))
        break;
      CHECK ((fd = open (file_name)) > 1, "open \"%s\"", file_name);
      snprintf (contents, sizeof contents, "contents %d\n", i);
      if (write (fd, contents, strlen (contents)) != (int) strlen (contents)) 
        {
          CHECK (remove (file_name), "remove \"%s\"", file_name);
          close (fd);
          break;
        }
      close (fd);
      
      /* Create directory. */
      snprintf (dir_name, sizeof dir_name, "dir%d", i);
      if (!mkdir (dir_name)) 
        {
          CHECK (remove (file_name), "remove \"%s\"", file_name);
          break; 
        }
 
      /* Check for file and directory. */
      CHECK ((fd = open (".")) > 1, "open \".\"");
      CHECK (readdir (fd, name[0]), "readdir \".\"");
      CHECK (readdir (fd, name[1]), "readdir \".\"");
      CHECK (!readdir (fd, name[2]), "readdir \".\" (should fail)");
      CHECK ((!strcmp (name[0], dir_name) && !strcmp (name[1], file_name))
             || (!strcmp (name[1], dir_name) && !strcmp (name[0], file_name)),
             "names should be \"%s\" and \"%s\", "
             "actually \"%s\" and \"%s\"",
             file_name, dir_name, name[0], name[1]);
      close (fd);
 
      /* Descend into directory. */
      CHECK (chdir (dir_name), "chdir \"%s\"", dir_name);
    }
  CHECK (i > 200, "created files and directories only to level %d", i);
  quiet = false;
 
  msg ("removing all but top 10 levels of files and directories...");
  quiet = true;
  while (i-- > 10) 
    {
      char file_name[16], dir_name[16];
 
      snprintf (file_name, sizeof file_name, "file%d", i);
      snprintf (dir_name, sizeof dir_name, "dir%d", i);
      CHECK (chdir (".."), "chdir \"..\"");
      CHECK (remove (dir_name), "remove \"%s\"", dir_name);
      CHECK (remove (file_name), "remove \"%s\"", file_name);
    }
  quiet = false;
}