fs.d/bootfs/mount.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2014 Joyent, Inc.  All rights reserved.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libintl.h>
#include <errno.h>
#include <sys/fstyp.h>
#include <sys/fsid.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/stat.h>
#include <fslib.h>

#define MNTTYPE_BOOTFS "bootfs"

static char  optbuf[MAX_MNTOPT_STR] = { '\0', };
static int   optsize = 0;

static void
usage(void)
{
    (void) fprintf(stderr,
        "Usage: mount [-Ormq] [-o options] special mountpoint\n");
    exit(2);
}

/*
 * usage: mount [-Ormq] [-o options] special mountp
 *
 * This mount program is exec'ed by /usr/sbin/mount if '-F bootfs' is
 * specified.
 */
int
main(int argc, char *argv[])
{
    int c;
    char *special;      /* Entity being mounted */
    char *mountp;       /* Entity being mounted on */
    char *savedoptbuf;
    char *myname;
    char typename[64];
    int flags = 0;
    int errflag = 0;
    int qflg = 0;

    myname = strrchr(argv[0], '/');
    myname = myname ? myname+1 : argv[0];
    (void) snprintf(typename, sizeof (typename), "%s %s", MNTTYPE_BOOTFS,
        myname);
    argv[0] = typename;

    while ((c = getopt(argc, argv, "o:rmOq")) != EOF) {
        switch (c) {
        case '?':
            errflag++;
            break;

        case 'o':
            if (strlcpy(optbuf, optarg, sizeof (optbuf)) >=
                sizeof (optbuf)) {
                (void) fprintf(stderr,
                    gettext("%s: Invalid argument: %s\n"),
                    myname, optarg);
                return (2);
            }
            optsize = strlen(optbuf);
            break;
        case 'O':
            flags |= MS_OVERLAY;
            break;
        case 'r':
            flags |= MS_RDONLY;
            break;

        case 'm':
            flags |= MS_NOMNTTAB;
            break;

        case 'q':
            qflg = 1;
            break;

        default:
            usage();
        }
    }
    if ((argc - optind != 2) || errflag) {
        usage();
    }
    special = argv[argc - 2];
    mountp = argv[argc - 1];

    if ((savedoptbuf = strdup(optbuf)) == NULL) {
        (void) fprintf(stderr, gettext("%s: out of memory\n"),
            myname);
        exit(2);
    }

    if (mount(special, mountp, flags | MS_OPTIONSTR, MNTTYPE_BOOTFS, NULL,
        0, optbuf, MAX_MNTOPT_STR)) {
        (void) fprintf(stderr, "mount: ");
        perror(special);
        exit(2);
    }
    if (optsize && !qflg) {
        cmp_requested_to_actual_options(savedoptbuf, optbuf,
            special, mountp);
    }

    return (0);
}