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9bind.c

/* © 2008 sqweek <sqweek@gmail.com>
 * See COPYING for details.
 */
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include <sys/stat.h>
#include <sys/mount.h>

int
main(int argc, char **argv)
{
      char *old = NULL, *new = NULL;
      struct stat stbuf;

      while (*++argv) {
            if (!old) {
                  old = *argv;
            } else if (!new) {
                  new = *argv;
            } else {
                  errx(1, "%s: too many arguments", *argv);
            }
      }

      if (!old || !new) {
            errx(1, "usage: 9bind old new");
      }

      /* Make sure mount exists, is writable, and not sticky */
      if (stat(new, &stbuf) || access(new, W_OK)) {
            err(1, "%s", new);
      }
      if (stbuf.st_mode & S_ISVTX) {
            errx(1, "%s: refusing to bind over sticky directory", new);
      }

      if (mount(old, new, NULL, MS_BIND, NULL)) {
            err(1, "mount");
      }

      return 0;
}

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