sanboot_cmd.c

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/*
 * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <ipxe/command.h>
#include <ipxe/parseopt.h>
#include <ipxe/uri.h>
#include <ipxe/sanboot.h>
#include <usr/autoboot.h>

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

/** @file
 *
 * SAN commands
 *
 */

/** "sanboot" options */
struct sanboot_options {
        /** Drive number */
        unsigned int drive;
        /** Do not describe SAN device */
        int no_describe;
        /** Keep SAN device */
        int keep;
        /** Filename */
        char *filename;
};

/** "sanboot" option list */
static union {
        /* "sanboot" takes all four options */
        struct option_descriptor sanboot[4];
        /* "sanhook" takes only --drive and --no-describe */
        struct option_descriptor sanhook[2];
        /* "sanunhook" takes only --drive */
        struct option_descriptor sanunhook[1];
} opts = {
        .sanboot = {
                OPTION_DESC ( "drive", 'd', required_argument,
                              struct sanboot_options, drive, parse_integer ),
                OPTION_DESC ( "no-describe", 'n', no_argument,
                              struct sanboot_options, no_describe, parse_flag ),
                OPTION_DESC ( "keep", 'k', no_argument,
                              struct sanboot_options, keep, parse_flag ),
                OPTION_DESC ( "filename", 'f', required_argument,
                              struct sanboot_options, filename, parse_string ),
        },
};


/** "sanhook" command descriptor */
static struct command_descriptor sanhook_cmd =
        COMMAND_DESC ( struct sanboot_options, opts.sanhook, 1, MAX_ARGUMENTS,
                       "<root-path>" );

/** "sanboot" command descriptor */
static struct command_descriptor sanboot_cmd =
        COMMAND_DESC ( struct sanboot_options, opts.sanboot, 0, MAX_ARGUMENTS,
                       "[<root-path>]" );

/** "sanunhook" command descriptor */
static struct command_descriptor sanunhook_cmd =
        COMMAND_DESC ( struct sanboot_options, opts.sanunhook, 0, 0, NULL );

/**
 * The "sanboot", "sanhook" and "sanunhook" commands
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @v default_flags     Default set of flags for uriboot()
 * @v no_root_path_flags Additional flags to apply if no root path is present
 * @ret rc              Return status code
 */
static int sanboot_core_exec ( int argc, char **argv,
                               struct command_descriptor *cmd,
                               int default_flags, int no_root_path_flags ) {
        struct sanboot_options opts;
        struct uri *uris[argc];
        int count;
        int flags;
        int i;
        int rc;

        /* Initialise options */
        memset ( &opts, 0, sizeof ( opts ) );
        opts.drive = san_default_drive();

        /* Parse options */
        if ( ( rc = reparse_options ( argc, argv, cmd, &opts ) ) != 0 )
                goto err_parse_options;

        /* Parse root paths, if present */
        count = ( argc - optind );
        for ( i = 0 ; i < count ; i++ ) {
                uris[i] = parse_uri ( argv[ optind + i ] );
                if ( ! uris[i] ) {
                        rc = -ENOMEM;
                        goto err_parse_uri;
                }
        }

        /* Construct flags */
        flags = default_flags;
        if ( opts.no_describe )
                flags |= URIBOOT_NO_SAN_DESCRIBE;
        if ( opts.keep )
                flags |= URIBOOT_NO_SAN_UNHOOK;
        if ( ! count )
                flags |= no_root_path_flags;

        /* Boot from root path */
        if ( ( rc = uriboot ( NULL, uris, count, opts.drive, opts.filename,
                              flags ) ) != 0 )
                goto err_uriboot;

 err_uriboot:
        i = count;
 err_parse_uri:
        for ( i-- ; i >= 0 ; i-- )
                uri_put ( uris[i] );
 err_parse_options:
        return rc;
}

/**
 * The "sanhook" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Return status code
 */
static int sanhook_exec ( int argc, char **argv ) {
        return sanboot_core_exec ( argc, argv, &sanhook_cmd,
                                   ( URIBOOT_NO_SAN_BOOT |
                                     URIBOOT_NO_SAN_UNHOOK ), 0 );
}

/**
 * The "sanboot" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Return status code
 */
static int sanboot_exec ( int argc, char **argv ) {
        return sanboot_core_exec ( argc, argv, &sanboot_cmd,
                                   0, URIBOOT_NO_SAN_UNHOOK );
}

/**
 * The "sanunhook" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Return status code
 */
static int sanunhook_exec ( int argc, char **argv ) {
        return sanboot_core_exec ( argc, argv, &sanunhook_cmd,
                                   ( URIBOOT_NO_SAN_DESCRIBE |
                                     URIBOOT_NO_SAN_BOOT ), 0 );
}

/** SAN commands */
struct command sanboot_commands[] __command = {
        {
                .name = "sanhook",
                .exec = sanhook_exec,
        },
        {
                .name = "sanboot",
                .exec = sanboot_exec,
        },
        {
                .name = "sanunhook",
                .exec = sanunhook_exec,
        },
};