Archipelago » blktap-utils

/*

 * Copyright (c) 2007, XenSource Inc.

 * Copyright (c) 2010, Citrix Systems, Inc.

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of XenSource Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include "libvhd.h"

int

vhd_util_set_field(int argc, char **argv)

{

        long value;

        int err, c;

        vhd_context_t vhd;

        char *name, *field;

        err   = -EINVAL;

        value = 0;

        name  = NULL;

        field = NULL;

        if (!argc || !argv)

                goto usage;

        optind = 0;

        while ((c = getopt(argc, argv, "n:f:v:h")) != -1) {

                switch (c) {

                case 'n':

                        name = optarg;

                        break;

                case 'f':

                        field = optarg;

                        break;

                case 'v':

                        err   = 0;

                        value = strtol(optarg, NULL, 10);

                        break;

                case 'h':

                default:

                        goto usage;

                }

        }

        if (!name || !field || optind != argc || err)

                goto usage;

        if (strnlen(field, 25) >= 25) {

                printf("invalid field\n");

                goto usage;

        }

        if (strcmp(field, "hidden") && strcmp(field, "marker")) {

                printf("invalid field %s\n", field);

                goto usage;

        }

        if (value < 0 || value > 255) {

                printf("invalid value %ld\n", value);

                goto usage;

        }

        err = vhd_open(&vhd, name, VHD_OPEN_RDWR);

        if (err) {

                printf("error opening %s: %d\n", name, err);

                return err;

        }

        if (!strcmp(field, "hidden")) {

                vhd.footer.hidden = (char)value;

                err = vhd_write_footer(&vhd, &vhd.footer);

                if (err == -ENOSPC && vhd_type_dynamic(&vhd) && value)

                        /* if no space to write the primary footer, at least write the 

                         * backup footer so that it's possible to delete the VDI */

                        err = vhd_write_footer_at(&vhd, &vhd.footer, 0);

        } else {

                err = vhd_set_marker(&vhd, (char)value);

        }

         vhd_close(&vhd);

        return err;

usage:

        printf("options: <-n name> <-f field> <-v value> [-h help]\n");

        return -EINVAL;

}