Some installer cleanup.

[dragonfly.git] / contrib / bsdinstaller-1.1.6 / src / backend / installer / fn_subpart.c

/*
 * Copyright (c)2004 The DragonFly Project.  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 the DragonFly Project 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 HOLDERS 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. 
 */

/*
 * fn_subpart.c
 * Installer Function : Create Subpartitions.
 * $Id: fn_subpart.c,v 1.50 2005/04/07 20:22:40 cpressey Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef ENABLE_NLS
#include <libintl.h>
#define _(String) gettext (String)
#else
#define _(String) (String)
#endif

#include "libaura/mem.h"
#include "libaura/buffer.h"
#include "libaura/dict.h"
#include "libaura/fspred.h"

#include "libdfui/dfui.h"
#include "libdfui/dump.h"
#include "libdfui/system.h"

#include "libinstaller/commands.h"
#include "libinstaller/diskutil.h"
#include "libinstaller/functions.h"
#include "libinstaller/uiutil.h"

#include "fn.h"
#include "flow.h"
#include "pathnames.h"

static int      create_subpartitions(struct i_fn_args *);
static long     default_capacity(struct storage *, int);
static int      check_capacity(struct i_fn_args *);
static int      check_subpartition_selections(struct dfui_response *, struct i_fn_args *);
static void     save_subpartition_selections(struct dfui_response *, struct i_fn_args *);
static void     populate_create_subpartitions_form(struct dfui_form *, struct i_fn_args *);
static int      warn_subpartition_selections(struct i_fn_args *);
static struct dfui_form *make_create_subpartitions_form(struct i_fn_args *);
static int      show_create_subpartitions_form(struct dfui_form *, struct i_fn_args *);

const char *def_mountpt[7]  = {"/", "swap", "/var", "/tmp", "/usr", "/home", NULL};
long def_capacity[7]        = {128,    128,    128,    128,    256,      -1,    0};

int expert = 0;

/*
 * Given a set of subpartitions-to-be in the selected slice,
 * create them.
 */
static int
create_subpartitions(struct i_fn_args *a)
{
        struct subpartition *sp;
        struct commands *cmds;
        int result = 0;
        int copied_original = 0;
        int num_partitions;

        cmds = commands_new();
        if (!is_file("%sinstall.disklabel.%s",
            a->tmp,
            slice_get_device_name(storage_get_selected_slice(a->s)))) {
                /*
                 * Get a copy of the 'virgin' disklabel.
                 * XXX It might make more sense for this to
                 * happen right after format_slice() instead.
                 */
                command_add(cmds, "%s%s -r %s >%sinstall.disklabel.%s",
                    a->os_root, cmd_name(a, "DISKLABEL"),
                    slice_get_device_name(storage_get_selected_slice(a->s)),
                    a->tmp,
                    slice_get_device_name(storage_get_selected_slice(a->s)));
        }

        /*
         * Weave together a new disklabel out the of the 'virgin'
         * disklabel, and the user's subpartition choices.
         */

        /*
         * Take everything from the 'virgin' disklabel up until the
         * '8 or 16 partitions' line.
         */
        num_partitions = 16;
        command_add(cmds, "%s%s '$2==\"partitions:\" || cut { cut = 1 } !cut { print $0 }' <%sinstall.disklabel.%s >%sinstall.disklabel",
            a->os_root, cmd_name(a, "AWK"),
            a->tmp,
            slice_get_device_name(storage_get_selected_slice(a->s)),
            a->tmp);

        /*
         * 8 or 16 partitions:
         * #        size   offset    fstype   [fsize bsize bps/cpg]
         *   c:  2128833        0    unused        0     0              # (Cyl.    0 - 2111*)
         */

#if defined(__FreeBSD__) && !defined(__DragonFly__)
        num_partitions = 8;
#endif

        command_add(cmds, "%s%s '%d partitions:' >>%sinstall.disklabel",
            a->os_root, cmd_name(a, "ECHO"), num_partitions ,a->tmp);
        command_add(cmds, "%s%s '%s' >>%sinstall.disklabel",
            a->os_root, cmd_name(a, "ECHO"),
            "#        size   offset    fstype   [fsize bsize bps/cpg]",
            a->tmp);

#ifdef DEBUG
        for (sp = slice_subpartition_first(storage_get_selected_slice(a->s));
             sp != NULL; sp = subpartition_next(sp)) {
                command_add(cmds, "%s%s 'mountpoint: %s device: %s'",
                     a->os_root, cmd_name(a, "ECHO"),
                     subpartition_get_mountpoint(sp),
                     subpartition_get_device_name(sp));
        }
#endif

        /*
         * Write a line for each subpartition the user wants.
         */
        for (sp = slice_subpartition_first(storage_get_selected_slice(a->s));
             sp != NULL; sp = subpartition_next(sp)) {
                if (subpartition_is_mfsbacked(sp)) {
                        continue;
                }
                if (subpartition_get_letter(sp) > 'c' && !copied_original) {
                        /*
                         * Copy the 'c' line from the 'virgin' disklabel.
                         */
                        command_add(cmds, "%s%s '^  c:' %sinstall.disklabel.%s >>%sinstall.disklabel",
                            a->os_root, cmd_name(a, "GREP"),
                            a->tmp,
                            slice_get_device_name(storage_get_selected_slice(a->s)),
                            a->tmp);
                        copied_original = 1;
                }
                if (subpartition_is_swap(sp)) {
                        command_add(cmds, "%s%s '  %c:\t%s\t*\tswap' >>%sinstall.disklabel",
                            a->os_root, cmd_name(a, "ECHO"),
                            subpartition_get_letter(sp),
                            capacity_to_string(subpartition_get_capacity(sp)),
                            a->tmp);
                } else {
                        command_add(cmds, "%s%s '  %c:\t%s\t%s\t4.2BSD\t%ld\t%ld\t99' >>%sinstall.disklabel",
                            a->os_root, cmd_name(a, "ECHO"),
                            subpartition_get_letter(sp),
                            capacity_to_string(subpartition_get_capacity(sp)),
                            subpartition_get_letter(sp) == 'a' ? "0" : "*",
                            subpartition_get_fsize(sp),
                            subpartition_get_bsize(sp),
                            a->tmp);
                }
        }
        if (!copied_original) {
                /*
                 * Copy the 'c' line from the 'virgin' disklabel,
                 * if we haven't yet (less than 2 subpartitions.)
                 */
                command_add(cmds, "%s%s '^  c:' %sinstall.disklabel.%s >>%sinstall.disklabel",
                    a->os_root, cmd_name(a, "GREP"),
                    a->tmp,
                    slice_get_device_name(storage_get_selected_slice(a->s)),
                    a->tmp);
        }
        temp_file_add(a, "install.disklabel");

        /*
         * Label the slice from the disklabel we just wove together.
         */
        command_add(cmds, "%s%s -R -B -r %s %sinstall.disklabel",
            a->os_root, cmd_name(a, "DISKLABEL"),
            slice_get_device_name(storage_get_selected_slice(a->s)),
            a->tmp);

        /*
         * Create a snapshot of the disklabel we just created
         * for debugging inspection in the log.
         */
        command_add(cmds, "%s%s %s",
            a->os_root, cmd_name(a, "DISKLABEL"),
            slice_get_device_name(storage_get_selected_slice(a->s)));

        /*
         * Create filesystems on the newly-created subpartitions.
         */
        for (sp = slice_subpartition_first(storage_get_selected_slice(a->s));
             sp != NULL; sp = subpartition_next(sp)) {
                if (subpartition_is_swap(sp) || subpartition_is_mfsbacked(sp))
                        continue;

                /*
                 * Ensure that all the needed device nodes exist.
                 */
                command_add_ensure_dev(a, cmds,
                    disk_get_device_name(storage_get_selected_disk(a->s)));
                command_add_ensure_dev(a, cmds,
                    slice_get_device_name(storage_get_selected_slice(a->s)));
                command_add_ensure_dev(a, cmds,
                    subpartition_get_device_name(sp));

                command_add(cmds, "%s%s%s %sdev/%s",
                    a->os_root, cmd_name(a, "NEWFS"),
                    subpartition_is_softupdated(sp) ? " -U" : "",
                    a->os_root,
                    subpartition_get_device_name(sp));
        }

        result = commands_execute(a, cmds);
        commands_free(cmds);
        return(result);
}

/*
 * +-------+------------+--------------+-----------------+-----------------+
 * | Mtpt  | Matt says  | FreeBSD says | I got away with | A tiny system   |
 * +-------+------------+--------------+-----------------+-----------------+
 * | /     |       256M |         100M |            256M |             64M |
 * | swap  |         1G | 2 or 3 * mem |  (4 * mem) 256M |   (1 * mem) 64M |
 * | /var  |       256M |          50M |            256M |             12M |
 * | /tmp  |       256M |          --- |            256M |             --- |
 * | /usr  | [4G to] 8G | (>160M) rest |              5G |            160M |
 * | /home |       rest |          --- |            3.5G |             --- |
 * +-------+------------+--------------+-----------------+-----------------+
 * | total |       10G+ |       ~430M+ |            9.5G |            300M |
 * +-------+------------+--------------+-----------------+-----------------+
 */

static long
default_capacity(struct storage *s, int mtpt)
{
        unsigned long swap;
        unsigned long capacity;

        if (mtpt == MTPT_HOME)
                return(-1);

        capacity = slice_get_capacity(storage_get_selected_slice(s));
        swap = 2 * storage_get_memsize(s);
        if (storage_get_memsize(s) > (capacity / 2) || capacity < 4096)
                swap = storage_get_memsize(s);

        if (capacity < DISK_MIN) {
                /*
                 * For the purposes of this installer:
                 * can't be done.  Sorry.
                 */
                return(-1);
        } else if (capacity < 523) {
                switch (mtpt) {
                case MTPT_ROOT: return(70);
                case MTPT_SWAP: return(swap);
                case MTPT_VAR:  return(32);
                case MTPT_TMP:  return(32);
                case MTPT_USR:  return(174);
                }
        } else if (capacity < 1024) {
                switch (mtpt) {
                case MTPT_ROOT: return(96);
                case MTPT_SWAP: return(swap);
                case MTPT_VAR:  return(64);
                case MTPT_TMP:  return(64);
                case MTPT_USR:  return(256);
                }
        } else if (capacity < 4096) {
                switch (mtpt) {
                case MTPT_ROOT: return(128);
                case MTPT_SWAP: return(swap);
                case MTPT_VAR:  return(128);
                case MTPT_TMP:  return(128);
                case MTPT_USR:  return(512);
                }
        } else if (capacity < 10240) {
                switch (mtpt) {
                case MTPT_ROOT: return(256);
                case MTPT_SWAP: return(swap);
                case MTPT_VAR:  return(256);
                case MTPT_TMP:  return(256);
                case MTPT_USR:  return(3072);
                }
        } else {
                switch (mtpt) {
                case MTPT_ROOT: return(256);
                case MTPT_SWAP: return(swap);
                case MTPT_VAR:  return(256);
                case MTPT_TMP:  return(256);
                case MTPT_USR:  return(8192);
                }
        }
        /* shouldn't ever happen */
        return(-1);
}

static int
check_capacity(struct i_fn_args *a)
{
        struct subpartition *sp;
        unsigned long min_capacity[7] = {70, 0, 8, 0, 174, 0, 0};
        unsigned long total_capacity = 0;
        int mtpt;
        
        if (subpartition_find(storage_get_selected_slice(a->s), "/usr") == NULL)
                min_capacity[MTPT_ROOT] += min_capacity[MTPT_USR];

        for (sp = slice_subpartition_first(storage_get_selected_slice(a->s));
             sp != NULL; sp = subpartition_next(sp)) {
                total_capacity += subpartition_get_capacity(sp);
                for (mtpt = 0; def_mountpt[mtpt] != NULL; mtpt++) {
                        if (strcmp(subpartition_get_mountpoint(sp), def_mountpt[mtpt]) == 0 &&
                            min_capacity[mtpt] > 0 &&
                            subpartition_get_capacity(sp) < min_capacity[mtpt]) {
                                inform(a->c, _("WARNING: the %s subpartition should "
                                    "be at least %dM in size or you will "
                                    "risk running out of space during "
                                    "the installation."),
                                    subpartition_get_mountpoint(sp), min_capacity[mtpt]);
                        }
                }
        }

        if (total_capacity > slice_get_capacity(storage_get_selected_slice(a->s))) {
                inform(a->c, _("The space allocated to all of your selected "
                    "subpartitions (%dM) exceeds the total "
                    "capacity of the selected primary partition "
                    "(%dM). Remove some subpartitions or choose "
                    "a smaller size for them and try again."),
                    total_capacity, slice_get_capacity(storage_get_selected_slice(a->s)));
                return(0);
        }

        return(1);
}

static int
check_subpartition_selections(struct dfui_response *r, struct i_fn_args *a)
{
        struct dfui_dataset *ds;
        struct dfui_dataset *star_ds = NULL;
        struct aura_dict *d;
        const char *mountpoint, *capstring;
        long capacity = 0;
        long bsize, fsize;
        int found_root = 0;
        int softupdates, mfsbacked;
        int valid = 1;

        d = aura_dict_new(1, AURA_DICT_LIST);

        if ((ds = dfui_response_dataset_get_first(r)) == NULL) {
                inform(a->c, _("Please set up at least one subpartition."));
                valid = 0;
        }

        for (ds = dfui_response_dataset_get_first(r); valid && ds != NULL;
            ds = dfui_dataset_get_next(ds)) {
#ifdef DEBUG
                dfui_dataset_dump(ds);
#endif
                mountpoint = dfui_dataset_get_value(ds, "mountpoint");
                capstring = dfui_dataset_get_value(ds, "capacity");

                if (expert) {
                        softupdates =
                            (strcmp(dfui_dataset_get_value(ds, "softupdates"), "Y") == 0);
                        fsize = atol(dfui_dataset_get_value(ds, "fsize"));
                        bsize = atol(dfui_dataset_get_value(ds, "bsize"));
                        mfsbacked = (strcmp(dfui_dataset_get_value(ds, "mfsbacked"), "Y") == 0);
                } else {
                        softupdates = (strcmp(mountpoint, "/") == 0 ? 0 : 1);
                        mfsbacked = (strcmp(mountpoint, "/tmp") == 0 ? 0 : 1);
                        fsize = -1;
                        bsize = -1;
                }

                if (aura_dict_exists(d, mountpoint, strlen(mountpoint) + 1)) {
                        inform(a->c, _("The same mount point cannot be specified "
                            "for two different subpartitions."));
                        valid = 0;
                }

                if (strcmp(mountpoint, "/") == 0)
                        found_root = 1;

                if (strcmp(capstring, "*") == 0) {
                        if (star_ds != NULL) {
                                inform(a->c, _("You cannot have more than one subpartition "
                                    "with a '*' capacity (meaning 'use the remainder "
                                    "of the primary partition'.)"));
                                valid = 0;
                        } else {
                                star_ds = ds;
                        }
                }
                
                if (!(!strcasecmp(mountpoint, "swap") || mountpoint[0] == '/')) {
                        inform(a->c, _("Mount point must be either 'swap', or it must "
                            "start with a '/'."));
                        valid = 0;
                }

                if (strpbrk(mountpoint, " \\\"'`") != NULL) {
                        inform(a->c, _("Mount point may not contain the following "
                            "characters: blank space, backslash, or "
                            "single, double, or back quotes."));
                        valid = 0;
                }
                
                if (strlen(capstring) == 0) {
                        inform(a->c, _("A capacity must be specified."));
                        valid = 0;
                }

                if (!string_to_capacity(capstring, &capacity)) {
                        inform(a->c, _("Capacity must be either a '*' symbol to indicate "
                            "'use the rest of the primary partition', or it "
                            "must be a series of decimal digits ending with a "
                            "'M' (indicating megabytes) or a 'G' (indicating "
                            "gigabytes.)"));
                        valid = 0;
                }

                /*
                 * If we made it through that obstacle course, all is well.
                 */

                if (valid)
                        aura_dict_store(d, mountpoint, strlen(mountpoint) + 1, "", 1);
        }

        if (!found_root) {
                inform(a->c, _("You must include a / (root) subpartition."));
                valid = 0;
        }

        if (aura_dict_size(d) > 16) {
                inform(a->c, _("You cannot have more than 16 subpartitions "
                    "on a single primary partition.  Remove some "
                    "and try again."));
                valid = 0;
        }

        aura_dict_free(d);

        return(valid);
}

static void
save_subpartition_selections(struct dfui_response *r, struct i_fn_args *a)
{
        struct dfui_dataset *ds;
        char mfsbacked;
        const char *mountpoint, *capstring;
        long capacity;
        long bsize, fsize;
        int softupdates;
        int valid = 1;

        subpartitions_free(storage_get_selected_slice(a->s));

        for (ds = dfui_response_dataset_get_first(r); valid && ds != NULL;
            ds = dfui_dataset_get_next(ds)) {
                mountpoint = dfui_dataset_get_value(ds, "mountpoint");
                capstring = dfui_dataset_get_value(ds, "capacity");

                if (expert) {
                        softupdates =
                            (strcmp(dfui_dataset_get_value(ds, "softupdates"), "Y") == 0);
                        fsize = atol(dfui_dataset_get_value(ds, "fsize"));
                        bsize = atol(dfui_dataset_get_value(ds, "bsize"));
                        mfsbacked = (strcmp(dfui_dataset_get_value(ds, "msfbacked"), "Y") == 0);
                } else {
                        softupdates = (strcmp(mountpoint, "/") == 0 ? 0 : 1);
                        mfsbacked = 0;
                        fsize = -1;
                        bsize = -1;
                }

                if (string_to_capacity(capstring, &capacity)) {
                        subpartition_new(storage_get_selected_slice(a->s), mountpoint, capacity,
                            softupdates, fsize, bsize, mfsbacked);
                }
        }
}

static void
populate_create_subpartitions_form(struct dfui_form *f, struct i_fn_args *a)
{
        struct subpartition *sp;
        struct dfui_dataset *ds;
        char temp[32];
        int mtpt;
        long capacity;

        if (slice_subpartition_first(storage_get_selected_slice(a->s)) != NULL) {
                /*
                 * The user has already given us their subpartition
                 * preferences, so use them here.
                 */
                for (sp = slice_subpartition_first(storage_get_selected_slice(a->s));
                     sp != NULL; sp = subpartition_next(sp)) {
                        ds = dfui_dataset_new();
                        dfui_dataset_celldata_add(ds, "mountpoint",
                            subpartition_get_mountpoint(sp));
                        dfui_dataset_celldata_add(ds, "capacity",
                            capacity_to_string(subpartition_get_capacity(sp)));
                        if (expert) {
                                dfui_dataset_celldata_add(ds, "softupdates",
                                    subpartition_is_softupdated(sp) ? "Y" : "N");
                                dfui_dataset_celldata_add(ds, "mfsbacked",
                                    subpartition_is_mfsbacked(sp) ? "Y" : "N");
                                snprintf(temp, 32, "%ld", subpartition_get_fsize(sp));
                                dfui_dataset_celldata_add(ds, "fsize",
                                    temp);
                                snprintf(temp, 32, "%ld", subpartition_get_bsize(sp));
                                dfui_dataset_celldata_add(ds, "bsize",
                                    temp);
                        }
                        dfui_form_dataset_add(f, ds);
                }
        } else {
                /*
                 * Otherwise, populate the form with datasets representing
                 * reasonably-calculated defaults.  The defaults are chosen
                 * based on the slice's total capacity and the machine's
                 * total physical memory (for swap.)
                 */
                for (mtpt = 0; def_mountpt[mtpt] != NULL; mtpt++) {
                        capacity = default_capacity(a->s, mtpt);
                        ds = dfui_dataset_new();
                        dfui_dataset_celldata_add(ds, "mountpoint",
                            def_mountpt[mtpt]);
                        dfui_dataset_celldata_add(ds, "capacity",
                            capacity_to_string(capacity));
                        if (expert) {
                                dfui_dataset_celldata_add(ds, "softupdates",
                                    strcmp(def_mountpt[mtpt], "/") != 0 ? "Y" : "N");
                                dfui_dataset_celldata_add(ds, "mfsbacked",
                                    "N");
                                dfui_dataset_celldata_add(ds, "fsize",
                                    capacity < 1024 ? "1024" : "2048");
                                dfui_dataset_celldata_add(ds, "bsize",
                                    capacity < 1024 ? "8192" : "16384");
                        }
                        dfui_form_dataset_add(f, ds);
                }
        }
}

static int
warn_subpartition_selections(struct i_fn_args *a)
{
        int valid = 0;
        struct aura_buffer *omit, *consequences;

        omit = aura_buffer_new(2048);
        consequences = aura_buffer_new(2048);

        valid = check_capacity(a);
        if (subpartition_find(storage_get_selected_slice(a->s), "/var") == NULL) {
                aura_buffer_cat(omit, "/var ");
                aura_buffer_cat(consequences, _("/var will be a plain dir in /\n"));
        }
        if (subpartition_find(storage_get_selected_slice(a->s), "/usr") == NULL) {
                aura_buffer_cat(omit, "/usr ");
                aura_buffer_cat(consequences, _("/usr will be a plain dir in /\n"));
        }
        if (subpartition_find(storage_get_selected_slice(a->s), "/tmp") == NULL) {
                aura_buffer_cat(omit, "/tmp ");
                aura_buffer_cat(consequences, _("/tmp will be symlinked to /var/tmp\n"));
        }
        if (subpartition_find(storage_get_selected_slice(a->s), "/home") == NULL) {
                aura_buffer_cat(omit, "/home ");
                aura_buffer_cat(consequences, _("/home will be symlinked to /usr/home\n"));
        }

        if (valid && aura_buffer_len(omit) > 0) {
                switch (dfui_be_present_dialog(a->c, _("Really omit?"),
                    _("Omit Subpartition(s)|Return to Create Subpartitions"),
                    _("You have elected to not have the following "
                    "subpartition(s):\n\n%s\n\n"
                    "The ramifications of these subpartition(s) being "
                    "missing will be:\n\n%s\n"
                    "Is this really what you want to do?"),
                    aura_buffer_buf(omit), aura_buffer_buf(consequences))) {
                case 1:
                        valid = 1;
                        break;
                case 2:
                        valid = 0;
                        break;
                default:
                        abort_backend();
                }
        }

        aura_buffer_free(omit);
        aura_buffer_free(consequences);

        return(!valid);
}

static struct dfui_form *
make_create_subpartitions_form(struct i_fn_args *a)
{
        struct dfui_field *fi;
        struct dfui_form *f;
        char msg_buf[1][1024];

        snprintf(msg_buf[0], sizeof(msg_buf[0]),
            _("Subpartitions further divide a primary partition for "
            "use with %s.  Some reasons you may want "
            "a set of subpartitions are:\n\n"
            "- you want to restrict how much data can be written "
            "to certain parts of the primary partition, to quell "
            "denial-of-service attacks; and\n"
            "- you want to speed up access to data on the disk."
            ""), OPERATING_SYSTEM_NAME);

        f = dfui_form_create(
            "create_subpartitions",
            _("Create Subpartitions"),
            _("Set up the subpartitions (also known as just `partitions' "
            "in BSD tradition) you want to have on this primary "
            "partition.\n\n"
            "For Capacity, use 'M' to indicate megabytes, 'G' to "
            "indicate gigabytes, or a single '*' to indicate "
            "'use the remaining space on the primary partition'."),

            msg_buf[0],

            "p", "special", "dfinstaller_create_subpartitions",
            "p", "minimum_width","64",

            "f", "mountpoint", _("Mountpoint"), "", "",
            "f", "capacity", _("Capacity"), "", "",

            "a", "ok", _("Accept and Create"), "", "",
            "a", "cancel", 
            (disk_get_formatted(storage_get_selected_disk(a->s)) ?
            _("Return to Select Disk") :
            _("Return to Select Primary Partition")), "", "",
            "p", "accelerator", "ESC",

            NULL
        );

        dfui_form_set_multiple(f, 1);
        dfui_form_set_extensible(f, 1);

        if (expert) {
                fi = dfui_form_field_add(f, "softupdates",
                    dfui_info_new(_("Softupdates"), "", ""));
                dfui_field_property_set(fi, "control", "checkbox");

                fi = dfui_form_field_add(f, "mfsbacked",
                    dfui_info_new(_("MFS"), "", ""));
                dfui_field_property_set(fi, "control", "checkbox");

                fi = dfui_form_field_add(f, "fsize",
                    dfui_info_new(_("Frag Sz"), "", ""));

                fi = dfui_form_field_add(f, "bsize",
                    dfui_info_new(_("Block Sz"), "", ""));

                dfui_form_action_add(f, "switch",
                    dfui_info_new(_("Switch to Normal Mode"), "", ""));
        } else {
                dfui_form_action_add(f, "switch",
                    dfui_info_new(_("Switch to Expert Mode"), "", ""));
        }

        return(f);
}

/*
 * Returns:
 *      -1 = the form should be redisplayed
 *       0 = failure, function is over
 *       1 = success, function is over
 */
static int
show_create_subpartitions_form(struct dfui_form *f, struct i_fn_args *a)
{
        struct dfui_dataset *ds;
        struct dfui_response *r;

        for (;;) {
                if (dfui_form_dataset_get_first(f) == NULL)
                        populate_create_subpartitions_form(f, a);

                if (!dfui_be_present(a->c, f, &r))
                        abort_backend();
        
                if (strcmp(dfui_response_get_action_id(r), "cancel") == 0) {
                        dfui_response_free(r);
                        return(0);
                } else if (strcmp(dfui_response_get_action_id(r), "switch") == 0) {
                        if (check_subpartition_selections(r, a)) {
                                save_subpartition_selections(r, a);
                                expert = expert ? 0 : 1;
                                dfui_response_free(r);
                                return(-1);
                        }
                } else {
                        if (check_subpartition_selections(r, a)) {
                                save_subpartition_selections(r, a);
                                if (!warn_subpartition_selections(a)) {
                                        if (!create_subpartitions(a)) {
                                                inform(a->c, _("The subpartitions you chose were "
                                                        "not correctly created, and the "
                                                        "primary partition may "
                                                        "now be in an inconsistent state. "
                                                        "We recommend re-formatting it "
                                                        "before proceeding."));
                                                dfui_response_free(r);
                                                return(0);
                                        } else {
                                                dfui_response_free(r);
                                                return(1);
                                        }
                                }
                        }
                }
                
                dfui_form_datasets_free(f);
                /* dfui_form_datasets_add_from_response(f, r); */
                for (ds = dfui_response_dataset_get_first(r); ds != NULL;
                    ds = dfui_dataset_get_next(ds)) {
                        dfui_form_dataset_add(f, dfui_dataset_dup(ds));
                }
        }
}

/*
 * fn_create_subpartitions: let the user specify what subpartitions they
 * want on the disk, how large each should be, and where it should be mounted.
 */
void
fn_create_subpartitions(struct i_fn_args *a)
{
        struct dfui_form *f;
        int done = 0;

        a->result = 0;
        while (!done) {
                f = make_create_subpartitions_form(a);
                switch (show_create_subpartitions_form(f, a)) {
                case -1:
                        done = 0;
                        break;
                case 0:
                        done = 1;
                        a->result = 0;
                        break;
                case 1:
                        done = 1;
                        a->result = 1;
                        break;
                }
                dfui_form_free(f);
        }
}