usr/src/cmd/fs.d/bootfs/mount.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  * Copyright (c) 2014 Joyent, Inc.  All rights reserved.
  26  */
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <libintl.h>
  32 #include <errno.h>
  33 #include <sys/fstyp.h>
  34 #include <sys/fsid.h>
  35 #include <sys/mntent.h>
  36 #include <sys/mnttab.h>
  37 #include <sys/mount.h>
  38 #include <sys/signal.h>
  39 #include <sys/stat.h>
  40 #include <fslib.h>
  41
  42 #define MNTTYPE_BOOTFS "bootfs"
  43
  44 static char  optbuf[MAX_MNTOPT_STR] = { '\0', };
  45 static int   optsize = 0;
  46
  47 static void
  48 usage(void)
  49 {
  50         (void) fprintf(stderr,
  51             "Usage: mount [-Ormq] [-o options] special mountpoint\n");
  52         exit(2);
  53 }
  54
  55 /*
  56  * usage: mount [-Ormq] [-o options] special mountp
  57  *
  58  * This mount program is exec'ed by /usr/sbin/mount if '-F bootfs' is
  59  * specified.
  60  */
  61 int
  62 main(int argc, char *argv[])
  63 {
  64         int c;
  65         char *special;          /* Entity being mounted */
  66         char *mountp;           /* Entity being mounted on */
  67         char *savedoptbuf;
  68         char *myname;
  69         char typename[64];
  70         int flags = 0;
  71         int errflag = 0;
  72         int qflg = 0;
  73
  74         myname = strrchr(argv[0], '/');
  75         myname = myname ? myname+1 : argv[0];
  76         (void) snprintf(typename, sizeof (typename), "%s %s", MNTTYPE_BOOTFS,
  77             myname);
  78         argv[0] = typename;
  79
  80         while ((c = getopt(argc, argv, "o:rmOq")) != EOF) {
  81                 switch (c) {
  82                 case '?':
  83                         errflag++;
  84                         break;
  85
  86                 case 'o':
  87                         if (strlcpy(optbuf, optarg, sizeof (optbuf)) >=
  88                             sizeof (optbuf)) {
  89                                 (void) fprintf(stderr,
  90                                     gettext("%s: Invalid argument: %s\n"),
  91                                     myname, optarg);
  92                                 return (2);
  93                         }
  94                         optsize = strlen(optbuf);
  95                         break;
  96                 case 'O':
  97                         flags |= MS_OVERLAY;
  98                         break;
  99                 case 'r':
 100                         flags |= MS_RDONLY;
 101                         break;
 102
 103                 case 'm':
 104                         flags |= MS_NOMNTTAB;
 105                         break;
 106
 107                 case 'q':
 108                         qflg = 1;
 109                         break;
 110
 111                 default:
 112                         usage();
 113                 }
 114         }
 115         if ((argc - optind != 2) || errflag) {
 116                 usage();
 117         }
 118         special = argv[argc - 2];
 119         mountp = argv[argc - 1];
 120
 121         if ((savedoptbuf = strdup(optbuf)) == NULL) {
 122                 (void) fprintf(stderr, gettext("%s: out of memory\n"),
 123                     myname);
 124                 exit(2);
 125         }
 126
 127         if (mount(special, mountp, flags | MS_OPTIONSTR, MNTTYPE_BOOTFS, NULL,
 128             0, optbuf, MAX_MNTOPT_STR)) {
 129                 (void) fprintf(stderr, "mount: ");
 130                 perror(special);
 131                 exit(2);
 132         }
 133         if (optsize && !qflg) {
 134                 cmp_requested_to_actual_options(savedoptbuf, optbuf,
 135                     special, mountp);
 136         }
 137
 138         return (0);
 139 }