/*

    File:       MountEmptyFS.c

    Contains:   Tool to mount EmptyFS volume.

    Written by: DTS

    Copyright:  Copyright (c) 2006 by Apple Computer, Inc., All Rights Reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under Apple's

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Change History (most recent first):

$Log: MountEmptyFS.c,v $

Revision 1.1  2006/07/04 14:04:03  eskimo1

First checked in.

*/

/////////////////////////////////////////////////////////////////////

// System interfaces

#include <assert.h>

#include <errno.h>

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <getopt.h>

#include <mach/mach.h>

#include <sys/mount.h>

// Mount argument definitions shared with kernel

#include "EmptyFSMountArgs.h"

/////////////////////////////////////////////////////////////////////

static int DoMount(const char *devNode, const char *mountPoint, uint32_t debugLevel, boolean_t forceFailure)

    // Mount the file system on devNode at mountPoint.  debugLevel 

    // and forceFailure are passed to the kernel as part of the mount 

    // arguments.

{

    int                 err;

    EmptyFSMountArgs    mountArgs;

    char                realMountPoint[MAXPATHLEN];

    // We have to canonicalise the mount point path because otherwise 

    // <x-man-page://8/umount> can't unmount it by name.

    err = 0;

    if ( realpath(mountPoint, realMountPoint) == NULL ) {

        err = EINVAL;

    }

    if (err == 0) {

        mountArgs.fDevNodePath  = devNode;

        mountArgs.fMagic        = kEmptyFSMountArgsMagic;

        mountArgs.fDebugLevel   = debugLevel;

        mountArgs.fForceFailure = forceFailure;

        err = mount("EmptyFS", realMountPoint, 0, &mountArgs);

        if (err < 0) {

            err = errno;

        }

    }

    return err;

}

static void PrintUsage(const char *argv0)

    // Print a helpful help message.

{

    const char *    progName;

    progName = strrchr(argv0, '/');

    if (progName == NULL) {

        progName = argv0;

    } else {

        progName += 1;

    }

    fprintf(stderr, "usage: %s [ -d | -F ] special-device filesystem-node\n", progName);

}

extern int main(int argc, char **argv)

{

    int         err;

    int         retVal;

    int         ch;

    uint32_t    debugLevel;

    boolean_t   forceFailure;

    // Parse command line options.

    debugLevel   = 0;

    forceFailure = FALSE;

    retVal = EXIT_SUCCESS;

    do {

        ch = getopt(argc, argv, "dF");

        if (ch != -1) {

            switch (ch) {

                case 'd':

                    debugLevel += 1;

                    break;

                case 'F':

                    forceFailure = TRUE;

                    break;

                case '?':

                default:

                    PrintUsage(argv[0]);

                    retVal = EXIT_FAILURE;

                    break;

            }

        }

    } while (ch != -1);

    // Fail if we don't have exactly two remaining arguments.

    if ( (retVal == EXIT_SUCCESS) && ((argc - optind) != 2) ) {

        PrintUsage(argv[0]);

        retVal = EXIT_FAILURE;

    }

    // If all is well, do the mount.

    if (retVal == EXIT_SUCCESS) {

        err = DoMount(argv[optind], argv[optind + 1], debugLevel, forceFailure);

        if (err != 0) {

            errno = err;

            perror(NULL);

            retVal = EXIT_FAILURE;

        }

    }

    return retVal;

}