freebsd-dev/usr.sbin/sysinstall/cdrom.c

/*
 * The new sysinstall program.
 *
 * This is probably the last attempt in the `sysinstall' line, the next
 * generation being slated to essentially a complete rewrite.
 *
 * $Id: cdrom.c,v 1.25 1996/10/10 09:22:24 jkh Exp $
 *
 * Copyright (c) 1995
 *	Jordan Hubbard.  All rights reserved.
 * Copyright (c) 1995
 * 	Gary J Palmer. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    verbatim and that no modifications are made prior to this
 *    point in the file.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY JORDAN HUBBARD ``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 JORDAN HUBBARD OR HIS PETS 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, LIFE 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.
 *
 */

/* These routines deal with getting things off of CDROM media */

#include "sysinstall.h"
#include <sys/stat.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <unistd.h>
#include <grp.h>
#include <fcntl.h>

#define CD9660
#include <sys/mount.h>
#undef CD9660

/*
 * This isn't a boolean like the others since we have 3 states for it:
 * 0 = cdrom isn't mounted, 1 = cdrom is mounted and we mounted it, 2 = cdrom
 * was already mounted when we came in and we should leave it that way when
 * we leave.
 */
static int cdromMounted;

Boolean
mediaInitCDROM(Device *dev)
{
    struct iso_args	args;
    Attribs *cd_attr;
    char *cp;
    Boolean dontRead;

    if (cdromMounted != CD_UNMOUNTED)
	return TRUE;

    bzero(&args, sizeof(args));
    args.fspec = dev->devname;
    args.flags = 0;

    cd_attr = alloca(sizeof(Attribs) * MAX_ATTRIBS);
    cp = NULL;
    dontRead = FALSE;
    /* If this cdrom's not already mounted or can't be mounted, yell */
    if (!file_readable("/cdrom/cdrom.inf")) {
	Mkdir("/cdrom");
	if (mount(MOUNT_CD9660, "/cdrom", MNT_RDONLY, (caddr_t) &args) == -1) {
	    if (errno != EBUSY) {
	    	msgConfirm("Error mounting %s on /cdrom: %s (%u)", dev->devname, strerror(errno), errno);
		return FALSE;
	    }
	}
	if (!file_readable("/cdrom/cdrom.inf")) {
	    if (msgYesNo("Warning: The CD currently in the drive is either not a FreeBSD\n"
			 "CD or it is an older (pre 2.1.5) FreeBSD CD which does not\n"
			 "have a version number on it.  Do you wish to use this CD anyway?") != 0) {
		unmount("/cdrom", MNT_FORCE);
		return FALSE;
	    }
	    dontRead = TRUE;
	}
	cdromMounted = CD_WE_MOUNTED_IT;
    }
    else
	cdromMounted = CD_ALREADY_MOUNTED;
    if (!dontRead && (DITEM_STATUS(attr_parse_file(cd_attr, "/cdrom/cdrom.inf")) == DITEM_FAILURE ||
	!(cp = attr_match(cd_attr, "CD_VERSION")) || strcmp(cp, variable_get(VAR_RELNAME)))) {
	unmount("/cdrom", MNT_FORCE);
	if (!cp)
	    msgConfirm("Unable to find a /cdrom/cdrom.inf file.\n"
		       "Either this is not a FreeBSD CDROM, there is a problem with\n"
		       "the CDROM driver or something is wrong with your hardware.\n"
		       "Please fix this problem (check the console logs on VTY2) and\n"
		       "try again.");
	else
	    msgConfirm("Warning: The version of the FreeBSD CD currently in the drive\n"
		       "(%s) does not match the version of this boot floppy\n"
		       "(%s).\n\n"
		       "If this is intentional, then please visit the Options editor\n"
		       "to set the boot floppy version string to match that of the CD\n"
		       "before selecting it as an installation media to avoid this warning", cp, variable_get(VAR_RELNAME));
    }
    msgDebug("Mounted FreeBSD CDROM on device %s as /cdrom\n", dev->devname);
    return TRUE;
}

int
mediaGetCDROM(Device *dev, char *file, Boolean probe)
{
    char	buf[PATH_MAX];

    if (isDebug())
	msgDebug("Request for %s from CDROM\n", file);
    snprintf(buf, PATH_MAX, "/cdrom/%s", file);
    if (file_readable(buf))
	return open(buf, O_RDONLY);
    snprintf(buf, PATH_MAX, "/cdrom/dists/%s", file);
    if (file_readable(buf))
	return open(buf, O_RDONLY);
    snprintf(buf, PATH_MAX, "/cdrom/%s/%s", variable_get(VAR_RELNAME), file);
    if (file_readable(buf))
	return open(buf, O_RDONLY);
    snprintf(buf, PATH_MAX, "/cdrom/%s/dists/%s", variable_get(VAR_RELNAME), file);
    return open(buf, O_RDONLY);
}

void
mediaShutdownCDROM(Device *dev)
{
    /* Only undo it if we did it */
    if (cdromMounted != CD_WE_MOUNTED_IT)
	return;
    msgDebug("Unmounting %s from /cdrom\n", dev->devname);
    if (unmount("/cdrom", MNT_FORCE) != 0) {
	msgConfirm("Could not unmount the CDROM from /cdrom: %s", strerror(errno));
	cdromMounted = CD_ALREADY_MOUNTED;	/* Guess somebody else got it */
    }
    else {
	msgDebug("Unmount successful\n");
	cdromMounted = CD_UNMOUNTED;
    }
}