For UBCD, we have a lot of config files.
Isolinux will load /boot/isolinux/isolinux.cfg, which will load
/ubcd/menus/syslinux/main.cfg
Syslinux will load /boot/syslinux/syslinux.cfg, which will load
/ubcd/menus/syslinux/main.cfg
The /ubcd/menus/syslinux/main.cfg loads several other config files when you
select the appropriate menu.
From all those menus you can go back to /ubcd/menus/syslinux/main.cfg.
The /ubcd/menus/syslinux/main.cfg needs to be different for isolinux and
syslinux:
- 'localboot -1' doesn't work with syslinux
- The contents for the config files for booting certain linux distro's
differ when you run them from CD (isolinux)
or from USB/HDD (syslinux)
To make this work, I did need to put the specific main.cfg (adapted for isolinux
and syslinux in respectively,
/boot/isolinux or /boot/syslinux, but this is quite ugly because all other
config files are in /ubcd/menus/syslinux/
(19 config files).
With a lot of help of Erwan Velu, I have now a com32 module that loads a config
file depending on the running
syslinux variant. It is based on the config.c32 module.
Usage: config <filename>
config ext=<filename> iso=<filename> pxe=<filename>
sys=<filename>
It supports the current style of loading a new config file:
config another.cfg
And it support the "bootloader variant dependend" loading of a config:
config iso=file1.cfg sys=file2.cfg
This will load file1..cfg file, when this command is run from isolinux.
It will load file2.cfg, when run from syslinux.
Now I can use it in UBCD a different config file for the "main.cfg"
file (/ubcd/menus/mainiso.cfg or /ubcd/menus/mainsys.cfg):
/boot/isolinux/isolinux.cfg:
=================================DEFAULT main
LABEL main
KERNEL /boot/syslinux/menu.c32
APPEND /ubcd/menus/syslinux/mainiso.cfg
=================================
/boot/syslinux/syslinux.cfg:
=================================DEFAULT main
LABEL main
KERNEL /boot/syslinux/menu.c32
APPEND /ubcd/menus/syslinux/mainsys.cfg
=================================
In a entry (e.g..: in '/boot/menus/syslinux/bios.cfg') that does need to
go back to the 'main.cfg' file
(/ubcd/menus/mainiso.cfg or /ubcd/menus/mainsys.cfg), I can use now:
=======================================================================LABEL -
MENU LABEL ..
KERNEL /boot/syslinux/config.c32
APPEND iso=/ubcd/menus/syslinux/mainiso.cfg sys=/ubcd/menus/syslinux/mainsys.cfg
=======================================================================
Gert Hulselmans
Probably it won't be that usefull for other people, but just in case someone
else needs this functionality:
/* ----------------------------------------------------------------------- *
*
* Copyright 2009 H. Peter Anvin - All Rights Reserved
*
* 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, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* config.c
*
* Loads a new configuration file
*
* Usage: config <filename>
* config ext=<filename> iso=<filename> pxe=<filename>
sys=<filename>
*
* Examples:
*
* - The following will load the config file 'another.cfg':
*
* config another.cfg
*
* - The following will load 'file1.cfg' when you run it from isolinux,
* and it will load 'file2.cfg' when you run it from syslinux.
*
* config iso=file1.cfg sys=file2.cfg
*
*/
#include <stdio.h>
#include <console.h>
#include <string.h>
#include <stdbool.h>
#include <syslinux/boot.h>
#include "syslinux/config.h"
char bootlinux[255];
char extlinux[255];
char isolinux[255];
char pxelinux[255];
char syslinux[255];
bool extlinux_param;
bool isolinux_param;
bool pxelinux_param;
bool syslinux_param;
const struct syslinux_version *sv;
/*
* Detect which variant of syslinux is running.
*/
int detect_syslinux()
{
sv = syslinux_version();
switch (sv->filesystem) {
case SYSLINUX_FS_EXTLINUX:
strncpy(bootlinux,extlinux,sizeof(bootlinux));
extlinux_param=true;
break;
case SYSLINUX_FS_ISOLINUX:
strncpy(bootlinux,isolinux,sizeof(bootlinux));
isolinux_param=true;
break;
case SYSLINUX_FS_PXELINUX:
strncpy(bootlinux,pxelinux,sizeof(bootlinux));
pxelinux_param=true;
break;
case SYSLINUX_FS_SYSLINUX:
strncpy(bootlinux,syslinux,sizeof(bootlinux));
syslinux_param=true;
break;
case SYSLINUX_FS_UNKNOWN:
default:
return 1;
}
return 0;
}
/*
* Detect which parameters are passed to our module and store them.
*/
void detect_parameters(const int argc, const char *argv[])
{
for (int i = 1; i < argc; i++) {
if (strncmp(argv[i], "ext=", 4) == 0) {
strncpy(extlinux, argv[i] + 4, sizeof(extlinux));
} else if (strncmp(argv[i], "iso=", 4) == 0) {
strncpy(isolinux, argv[i] + 4, sizeof(isolinux));
} else if (strncmp(argv[i], "pxe=", 4) == 0) {
strncpy(pxelinux, argv[i] + 4, sizeof(pxelinux));
} else if (strncmp(argv[i], "sys=", 4) == 0) {
strncpy(syslinux, argv[i] + 4, sizeof(syslinux));
} else if (argc == 2) {
strncpy(extlinux, argv[1], sizeof(extlinux));
strncpy(isolinux, argv[1], sizeof(isolinux));
strncpy(pxelinux, argv[1], sizeof(pxelinux));
strncpy(syslinux, argv[1], sizeof(syslinux));
}
}
}
void init_structs() {
memset(bootlinux,0,sizeof(bootlinux));
memset(extlinux,0,sizeof(extlinux));
memset(isolinux,0,sizeof(isolinux));
memset(pxelinux,0,sizeof(pxelinux));
memset(syslinux,0,sizeof(syslinux));
extlinux_param=false;
pxelinux_param=false;
isolinux_param=false;
syslinux_param=false;
}
void show_usage() {
fprintf(stderr, "Usage: config <filename>\n");
fprintf(stderr, " config ext=<filename> iso=<filename>
pxe=<filename> sys=<filename> \n");
}
int main(int argc, const char *argv[])
{
openconsole(&dev_null_r, &dev_stdcon_w);
if (argc < 2) {
fprintf(stderr, "No config file specified.\n\n");
show_usage();
return 1;
}
init_structs();
detect_parameters(argc,argv);
if (detect_syslinux() == 1) {
fprintf(stderr, "No valid bootloader found..\n\n");
show_usage();
return 1;
}
if (strlen(bootlinux) > 0 ) {
syslinux_run_kernel_image(bootlinux, "", 0, IMAGE_TYPE_CONFIG);
fprintf(stderr, "config: failed to load '%s' (missing
file?).\n\n", bootlinux);
show_usage();
return 1;
} else if (extlinux_param | isolinux_param | pxelinux_param | syslinux_param)
{
fprintf(stderr, "No config file specified for the current
bootloader.\n\n");
show_usage();
return 1;
}
return 0;
}
