/*
 * Copyright (c) 1997-2014 Erez Zadok
 * Copyright (c) 1989 Jan-Simon Pendry
 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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.
 *
 *
 * File: am-utils/fsinfo/wr_fstab.c
 *
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <fsi_data.h>
#include <fsinfo.h>

#define	GENERIC_OS_NAME "generic"

/* forward definitions */
static void write_aix1_dkfstab(FILE *ef, disk_fs *dp);
static void write_aix1_dkrmount(FILE *ef, char *hn, fsmount *fp);
static void write_aix3_dkfstab(FILE *ef, disk_fs *dp);
static void write_aix3_dkrmount(FILE *ef, char *hn, fsmount *fp);
static int  write_dkfstab(FILE *ef, qelem *q, void (*output) (FILE *, disk_fs *));
static int write_dkrmount(FILE *ef, qelem *q, char *hn, void (*output) (FILE *, char *, fsmount *));
static void write_generic_dkfstab(FILE *ef, disk_fs *dp);
static void write_generic_dkrmount(FILE *ef, char *hn, fsmount *fp);
static void write_ultrix_dkfstab(FILE *ef, disk_fs *dp);
static void write_ultrix_dkrmount(FILE *ef, char *hn, fsmount *fp);

/* ----------------------------------------------- */

static struct os_fstab_type {
  char *os_name;
  void (*op_fstab) (FILE *ef, disk_fs *dp);
  void (*op_mount) (FILE *ef, char *hn, fsmount *fp);
} os_tabs[] = {

  {
    "aix1", write_aix1_dkfstab, write_aix1_dkrmount
  },				/* AIX 1 */
  {
    "aix3", write_aix3_dkfstab, write_aix3_dkrmount
  },				/* AIX 3 */
  {
    "generic", write_generic_dkfstab, write_generic_dkrmount
  },				/* Generic */
  {
    "u2_0", write_ultrix_dkfstab, write_ultrix_dkrmount
  },				/* Ultrix */
  {
    "u3_0", write_ultrix_dkfstab, write_ultrix_dkrmount
  },				/* Ultrix */
  {
    "u4_0", write_ultrix_dkfstab, write_ultrix_dkrmount
  },				/* Ultrix */
  {
    NULL, NULL, NULL
  }
};


/* ---------- AIX 1 ------------------------------ */

/*
 * AIX 1 format
 */
static void
write_aix1_dkfstab(FILE *ef, disk_fs *dp)
{
  char *hp = xstrdup(dp->d_host->h_hostname);
  char *p = strchr(hp, '.');

  if (p)
    *p = '\0';

  fprintf(ef, "\n%s:\n\tdev = %s\n\tvfs = %s\n\ttype = %s\n\tlog = %s\n\tvol = %s\n\topts = %s\n\tmount = true\n\tcheck = true\n\tfree = false\n",
	  dp->d_mountpt,
	  dp->d_dev,
	  dp->d_fstype,
	  dp->d_fstype,
	  dp->d_log,
	  dp->d_mountpt,
	  dp->d_opts);
  XFREE(hp);
}


static void
write_aix1_dkrmount(FILE *ef, char *hn, fsmount *fp)
{
  char *h = xstrdup(fp->f_ref->m_dk->d_host->h_hostname);
  char *hp = xstrdup(h);
  char *p = strchr(hp, '.');

  if (p)
    *p = '\0';
  domain_strip(h, hn);
  fprintf(ef, "\n%s:\n\tsite = %s\n\tdev = %s:%s\n\tvfs = %s\n\ttype = %s\n\tvol = %s\n\topts = %s\n\tmount = true\n\tcheck = true\n\tfree = false\n",
	  fp->f_localname,
	  hp,
	  h,
	  fp->f_volname,
	  fp->f_fstype,
	  fp->f_fstype,
	  fp->f_localname,
	  fp->f_opts);

  XFREE(hp);
  XFREE(h);
}


/* ---------- AIX 3 ------------------------------ */

/*
 * AIX 3 format
 */
static void
write_aix3_dkfstab(FILE *ef, disk_fs *dp)
{
  if (STREQ(dp->d_fstype, "jfs") &&
      NSTREQ(dp->d_dev, "/dev/", 5) &&
      !dp->d_log)
    error("aix 3 needs a log device for journalled filesystem (jfs) mounts");

  fprintf(ef, "\n%s:\n\tdev = %s\n\tvfs = %s\n\ttype = %s\n\tlog = %s\n\tvol = %s\n\topts = %s\n\tmount = true\n\tcheck = true\n\tfree = false\n",
	  dp->d_mountpt,
	  dp->d_dev,
	  dp->d_fstype,
	  dp->d_fstype,
	  dp->d_log,
	  dp->d_mountpt,
	  dp->d_opts);
}


static void
write_aix3_dkrmount(FILE *ef, char *hn, fsmount *fp)
{
  char *h = xstrdup(fp->f_ref->m_dk->d_host->h_hostname);

  domain_strip(h, hn);
  fprintf(ef, "\n%s:\n\tdev = %s:%s\n\tvfs = %s\n\ttype = %s\n\tvol = %s\n\topts = %s\n\tmount = true\n\tcheck = true\n\tfree = false\n",
	  fp->f_localname,
	  h,
	  fp->f_volname,
	  fp->f_fstype,
	  fp->f_fstype,
	  fp->f_localname,
	  fp->f_opts);

  XFREE(h);
}


/* ---------- Ultrix ----------------------------- */

static void
write_ultrix_dkfstab(FILE *ef, disk_fs *dp)
{
  fprintf(ef, "%s:%s:%s:%s:%d:%d\n",
	  dp->d_dev,
	  dp->d_mountpt,
	  dp->d_fstype,
	  dp->d_opts,
	  dp->d_freq,
	  dp->d_passno);
}


static void
write_ultrix_dkrmount(FILE *ef, char *hn, fsmount *fp)
{
  char *h = xstrdup(fp->f_ref->m_dk->d_host->h_hostname);

  domain_strip(h, hn);
  fprintf(ef, "%s@%s:%s:%s:%s:0:0\n",
	  fp->f_volname,
	  h,
	  fp->f_localname,
	  fp->f_fstype,
	  fp->f_opts);
  XFREE(h);
}


/* ---------- Generic ---------------------------- */

/*
 * Generic (BSD, SunOS, HPUX) format
 */
static void
write_generic_dkfstab(FILE *ef, disk_fs *dp)
{
  fprintf(ef, "%s %s %s %s %d %d\n",
	  dp->d_dev,
	  dp->d_mountpt,
	  dp->d_fstype,
	  dp->d_opts,
	  dp->d_freq,
	  dp->d_passno);
}


static void
write_generic_dkrmount(FILE *ef, char *hn, fsmount *fp)
{
  char *h;

  if (fp->f_ref) {
    h = xstrdup(fp->f_ref->m_dk->d_host->h_hostname);
  } else {
    h = xstrdup(fp->f_from);
  }
  domain_strip(h, hn);
  fprintf(ef, "%s:%s %s %s %s 0 0\n",
	  h,
	  fp->f_volname,
	  fp->f_localname,
	  fp->f_fstype,
	  fp->f_opts);
  XFREE(h);
}


static struct os_fstab_type *
find_fstab_type(host *hp)
{
  struct os_fstab_type *op = NULL;
  char *os_name = NULL;

again:;
  if (os_name == 0) {
    if (ISSET(hp->h_mask, HF_OS))
      os_name = hp->h_os;
    else
      os_name = GENERIC_OS_NAME;
  }
  for (op = os_tabs; op->os_name; op++)
    if (STREQ(os_name, op->os_name))
      return op;

  os_name = GENERIC_OS_NAME;
  goto again;
}


static int
write_dkfstab(FILE *ef, qelem *q, void (*output) (FILE *, disk_fs *))
{
  int errors = 0;
  disk_fs *dp;

  ITER(dp, disk_fs, q)
  if (!STREQ(dp->d_fstype, "export"))
      (*output) (ef, dp);

  return errors;
}


static int
write_dkrmount(FILE *ef, qelem *q, char *hn, void (*output) (FILE *, char *, fsmount *))
{
  int errors = 0;
  fsmount *fp;

  ITER(fp, fsmount, q)
    (*output) (ef, hn, fp);

  return errors;
}


int
write_fstab(qelem *q)
{
  int errors = 0;

  if (fstab_pref) {
    host *hp;

    show_area_being_processed("write fstab", 4);
    ITER(hp, host, q) {
      if (hp->h_disk_fs || hp->h_mount) {
	FILE *ef = pref_open(fstab_pref, hp->h_hostname, gen_hdr, hp->h_hostname);
	if (ef) {
	  struct os_fstab_type *op = find_fstab_type(hp);
	  show_new(hp->h_hostname);
	  if (hp->h_disk_fs)
	    errors += write_dkfstab(ef, hp->h_disk_fs, op->op_fstab);
	  else
	    fsi_log("No local disk mounts on %s", hp->h_hostname);

	  if (hp->h_mount)
	    errors += write_dkrmount(ef, hp->h_mount, hp->h_hostname, op->op_mount);

	  pref_close(ef);
	}
      } else {
	error("no disk mounts on %s", hp->h_hostname);
      }
    }
  }
  return errors;
}