bootlst/common/bootlst.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.
 */
#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/promif.h>
#include <sys/salib.h>

#define MAX_CMDLINE 1600  /* from GRUB source */

char **titles;
char **datasets;

int menu_entry_count;
int menu_table_size;

int in_menu_entry;

#define ENTRY_ALLOC_COUNT   10

extern void set_default_fs(char *fsw_name);
extern int  mountroot(char *str);

void
init_table(void)
{

    menu_entry_count = 0;
    titles = (char **)calloc(ENTRY_ALLOC_COUNT, sizeof (char *));
    datasets = (char **)calloc(ENTRY_ALLOC_COUNT, sizeof (char *));
    if (titles == NULL || datasets == NULL)
        prom_panic("out of mem");
    menu_table_size = ENTRY_ALLOC_COUNT;
    in_menu_entry = 0;
}

void
add_title_entry(char *title_str)
{

    /* skip leading white space */
    while (isspace(*title_str))
        title_str++;

    if (menu_entry_count == menu_table_size) {
        printf("Reallocating at count %d\n", menu_table_size);
        titles = (char **)realloc(titles,
            ENTRY_ALLOC_COUNT * sizeof (char *));
        datasets = (char **)realloc(datasets,
            ENTRY_ALLOC_COUNT * sizeof (char *));
        if (titles == NULL || datasets == NULL)
            prom_panic("out of mem");
        menu_table_size += ENTRY_ALLOC_COUNT;
    }

    if (in_menu_entry)
        free(titles[menu_entry_count]);
    if ((titles[menu_entry_count] = strdup(title_str)) == NULL)
        prom_panic("out of mem");
    in_menu_entry = 1;
}

void
add_dataset_entry(char *dataset_str)
{
    char    *cp;

    /* skip leading white space */
    while (isspace(*dataset_str))
        dataset_str++;

    /* if there is still any white space in the line, it's invalid */
    for (cp = dataset_str; *cp; cp++)
        if (isspace(*cp))
            break;
    if (*cp)
        return;  /* dataset name was invalid */

    if (!in_menu_entry)
        return;  /* dataset line was not preceded by a title */

    if ((datasets[menu_entry_count] = strdup(dataset_str)) == NULL)
        prom_panic("out of mem");
    menu_entry_count++;
    in_menu_entry = 0;
}


char *
trim_white_space(char *cp)
{
    char    *ep;

    /* skip leading white space */
    while (isspace(*cp))
        cp++;

    /*
     *  if the string contained nothing but white space, return a
     *  null string.
     */
    if (*cp == '\0')
        return (cp);

    /* truncate trailing white space */
    for (ep = cp + strlen(cp) - 1; isspace(*ep); ep--)
        ;
    ep++;
    *ep = '\0';
    return (cp);
}

char *cons_gets(char *, int);

void
main(void *cif)
{
    char linebuf[MAX_CMDLINE];
    FILE    *file;
    char    *cp, *ep;
    int n;
    unsigned long   choice;

    prom_init("bootlst", cif);
    set_default_fs("promfs");
    if (mountroot("bootfs") != 0)
        prom_panic("can't mount root");

    if ((file = fopen("/boot/menu.lst", "r")) == NULL)
        prom_panic("can't open menu.lst");
    init_table();

    while (fgets(linebuf, MAX_CMDLINE, file)) {
        cp = trim_white_space(linebuf);

        /* skip comments and blank lines */
        if (*cp == '#' || *cp == '\0')
            continue;

        /* find end of first keyword on line */
        for (ep = cp; !isspace(*ep) && *ep; ep++)
            ;

        /* if at the end of the line, the line had no arguments */
        if (*ep == '\0')
            continue;

        *ep = '\0';

        if (strcmp(cp, "title") == 0) {
            add_title_entry(ep + 1);
            continue;
        }

        if (strcmp(cp, "bootfs") == 0) {
            add_dataset_entry(ep + 1);
            continue;
        }
    }

    if (menu_entry_count == 0)
        prom_panic("no menu entries found");

    for (n = 0; n < menu_entry_count; n++) {
        printf("%d %s\n", n + 1, titles[n]);
    }

    printf("Select environment to boot: [ 1 - %d ]: ", menu_entry_count);

    while (cons_gets(linebuf, MAX_CMDLINE)) {
        /* cut off leading and trailing white space */
        cp = trim_white_space(linebuf);
        choice = strtoul(cp, NULL, 0);

        /*
         * If the input is totally invalid, the return value of
         * strtoul() will be 0 or ULONG_MAX.  Either way, it's
         * of the acceptable range.
         */
        if (choice == 0 || choice > menu_entry_count) {
            printf("Invalid entry.\n");
            continue;
        }
        /* XXX here is the result */
        printf("\nTo boot the selected entry, invoke:\n");
        printf("boot [<root-device>] -Z %s\n\n", datasets[choice - 1]);
        prom_exit_to_mon();
    }
}