/*      $NetBSD: pnullfs.c,v 1.18 2008/11/26 14:03:48 pooka Exp $       */

/*
* Copyright (c) 2007  Antti Kantee.  All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* pnullfs: puffs nullfs example
*/

#include <err.h>
#include <puffs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void usage(void);

static void
usage()
{

       errx(1, "usage: %s [-s] [-o mntopts] nullpath mountpath",
           getprogname());
}

int
main(int argc, char *argv[])
{
       struct puffs_usermount *pu;
       struct puffs_ops *pops;
       struct puffs_pathobj *po_root;
       struct puffs_node *pn_root;
       struct stat sb;
       mntoptparse_t mp;
       int mntflags, pflags;
       int ch;
       int detach;

       setprogname(argv[0]);

       if (argc < 3)
               usage();

       pflags = mntflags = 0;
       detach = 1;
       while ((ch = getopt(argc, argv, "o:s")) != -1) {
               switch (ch) {
               case 'o':
                       mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
                       if (mp == NULL)
                               err(1, "getmntopts");
                       freemntopts(mp);
                       break;
               case 's':
                       detach = 0;
                       break;
               }
       }
       pflags |= PUFFS_FLAG_BUILDPATH;
       argv += optind;
       argc -= optind;

       if (pflags & PUFFS_FLAG_OPDUMP)
               detach = 0;

       if (argc != 2)
               usage();

       if (lstat(argv[0], &sb) == -1)
               err(1, "stat %s", argv[0]);
       if ((sb.st_mode & S_IFDIR) == 0)
               errx(1, "%s is not a directory", argv[0]);

       PUFFSOP_INIT(pops);
       puffs_null_setops(pops);

       if ((pu = puffs_init(pops, argv[0], "pnullfs", NULL, pflags)) == NULL)
               err(1, "init");

       pn_root = puffs_pn_new(pu, NULL);
       if (pn_root == NULL)
               err(1, "puffs_pn_new");
       puffs_setroot(pu, pn_root);
       puffs_setfhsize(pu, 0, PUFFS_FHFLAG_PASSTHROUGH);

       po_root = puffs_getrootpathobj(pu);
       if (po_root == NULL)
               err(1, "getrootpathobj");
       po_root->po_path = argv[0];
       po_root->po_len = strlen(argv[0]);
       puffs_stat2vattr(&pn_root->pn_va, &sb);

       if (detach)
               if (puffs_daemon(pu, 1, 1) == -1)
                       err(1, "puffs_daemon");

       if (puffs_mount(pu, argv[1], mntflags, pn_root) == -1)
               err(1, "puffs_mount");
       if (puffs_mainloop(pu) == -1)
               err(1, "mainloop");

       return 0;
}