NAME
     genpxelinux.pl - generate pxelinux configuration files

SYNOPSIS
     genpxelinux.pl [--tftpboot dir] [--template file] [--debug level]

DESCRIPTION
    Genpxelinux.pl generates pxelinux configuration files. Pxelinux uses
    simple config files that do not have any sort of conditional support or
    macro expansion. Pxelinux generally either loads a default configuration
    file or one that is specific to a particular machine.

    Genpxelinux.pl will generate multiple configuration files from one
    template. It will also generate the menu files that are displayed to
    users.

    The alternatives to using genpxelinux.pl to generate configuration files
    for pxelinux is to either make them by hand or use something like
    menu.c32 to provide menus.

EXAMPLE CONFIGURATION FILE
     SERIAL 0 $(9600) 0x003
     DEFAULT disk
     TIMEOUT 200
     PROMPT 1

     #SET 9600 9600

     #SYSTEM        01-00-06-5b-3a-31-d1 dell1
     #FOR dell1     #SET memlimit mem=3050m
     #FOR dell1     DEFAULT nfs2

     #SYSTEM 01-00-06-5b-04-cb-4d dell2
     #FOR dell2     #SET memlimit mem=3050m
     #FOR dell2     DEFAULT nfs1

     # must set $(nfs1) and $(nfs2)
     #INCLUDE config.gen

     #MENU DISPLAY
     <Ctrl-F><digit> for menus:
     1-disk booting  3-Disk tools      5-tbd         7-dell stuff    9-tbd
     2-Linux         4-hardware testng 6-misc        8-tbd           0-this menu
     DEFAULT is $(directive_DEFAULT)

     #END

     ############################################################################
     #MENU F1
                     Disk Booting
     #END
     ############################################################################

     LABEL disk
             #ITEM          localboot
             LOCALBOOT 0
     LABEL lb80
             #ITEM          "localboot 0x80"
             LOCALBOOT 0x80
     LABEL lb81
             #ITEM          "localboot 0x81"
             LOCALBOOT 0x81
     LABEL hd0mbr
             #ITEM          <hd[0123]mbr>     mbr boot off disk 0,1,2,3
             KERNEL chain.c32
             APPEND hd0
     LABEL hd0a
             #ITEM          <hd[0123][abcd]>  boot off disk 0,1,2,3 partition a-d (1-4)
             KERNEL chain.c32
             APPEND hd0 1
     LABEL hd0b
             KERNEL chain.c32
             APPEND hd0 2
     LABEL hd0c
             KERNEL chain.c32
             APPEND hd0 3
     LABEL hd0d
             KERNEL chain.c32
             APPEND hd0 4

     LABEL hj1mbr
             KERNEL chain.c32
             APPEND hd1
     LABEL hd1a
             KERNEL chain.c32
             APPEND hd1 1
     LABEL hd1b
             KERNEL chain.c32
             APPEND hd1 2
     LABEL hd1c
             KERNEL chain.c32
             APPEND hd1 3
     LABEL hd1d
             KERNEL chain.c32
             APPEND hd1 4

     LABEL hd2mbr
             KERNEL chain.c32
             APPEND hd2
     LABEL hd2a
             KERNEL chain.c32
             APPEND hd2 1
     LABEL hd2b
             KERNEL chain.c32
             APPEND hd2 2
     LABEL hd2c
             KERNEL chain.c32
             APPEND hd2 3
     LABEL hd2d
             KERNEL chain.c32
             APPEND hd2 4

     LABEL hd3mbr
             KERNEL chain.c32
             APPEND hd3
     LABEL hd3a
             KERNEL chain.c32
             APPEND hd3 1
     LABEL hd3b
             KERNEL chain.c32
             APPEND hd3 2
     LABEL hd3c
             KERNEL chain.c32
             APPEND hd3 3
     LABEL hd3d
             KERNEL chain.c32
             APPEND hd3 4


     ############################################################################
     #MENU F2
                     Linux Recovery Mode
     #END
     ############################################################################

     LABEL nfs1
             #ITEM          Diskless, $(nfs1)
             KERNEL linux/staid-vmlinuz-2.6.12-3
             APPEND root=/dev/nfs nfsroot=$(nfs1) console=tty0 console=ttyS0,$(9600) panic=30 no1394 $(memlimit)
             IPAPPEND 1

     LABEL nfs2
             #ITEM          Diskless, $(nfs2)
             KERNEL linux/staid-vmlinuz-2.6.12-3
             APPEND root=/dev/nfs nfsroot=$(nfs2) console=tty0 console=ttyS0,$(9600) panic=30 no1394 $(memlimit)
             IPAPPEND 1

     ############################################################################
     #MENU F3
                     Disk Tools
     #END
     ############################################################################

     LABEL ibm1
             #ITEM F3       IBM's Drive Fitness Test
             KERNEL memdisk
             APPEND initrd=tools/dft32_v405_b00_install.img
     LABEL ibm2
             #ITEM F3       IBM's Drive Feature Tool
             KERNEL memdisk
             APPEND initrd=tools/ftool_198_install.img
     LABEL maxtor
             #ITEM F3       Maxtor's MaxBlast
             KERNEL memdisk
             APPEND initrd=tools/maxblast.img
     LABEL seagate
             #ITEM F3       Seagate Seatools
             KERNEL memdisk
             APPEND initrd=tools/seatools-1.09.img
     LABEL killdisk
             #ITEM F3       killdisk from the ultimate boot cdrom
             KERNEL memdisk
             APPEND initrd=tools/killdisk.img

     ############################################################################
     #MENU F4
                     Hardware Testing
     #END
     ############################################################################

     LABEL memtest86+
             #ITEM F4       MemTest86+, http://www.memtest.org
             KERNEL memdisk
             APPEND initrd=tools/memtest86+-1.70.img
     LABEL memtest+
             KERNEL memdisk
             APPEND initrd=tools/memtest86+-1.70.img
     LABEL memtest
             #ITEM F4       memtest86
             KERNEL memdisk
             APPEND initrd=tools/memtest86.img
     LABEL memtest86
             KERNEL memdisk
             APPEND initrd=tools/memtest86.img
     LABEL sniff
             #ITEM F4       PCI Sniffer, http://www.miray.de/products/sat.pcisniffer.html
             KERNEL memdisk
             APPEND initrd=tools/pcisniffer.img

     ############################################################################
     #MENU F6
                     Miscellaneous Stuff
     #END
     ############################################################################

     LABEL ntpasswd
             #ITEM F6       NT Registry & Password reset tool
             # http://home.eunet.no/~pnordahl/ntpasswd/bootdisk.html
             KERNEL memdisk
             APPEND initrd=tools/bd050303.bin

MACROS
    Genpxelinux.pl supports the following macros and directives.

    #SYSTEM address system-name
        The "#SYSTEM" directive tells genpxelinux.pl to generate a
        configuration file for the system that asks from a particular
        address. All related configuration entries use the system name.

        Pxelinux asks for configuration using a somewhat strange way of
        writing ethernet mac addresses: 01-hh-hh-hh-hh-hh-hh. The #SYSTEM
        parameter will accept the pxelinux version or you can write the
        address in the more usual HH:HH:HH:HH:HH:HH format.

        Pxelinuxalso looks things up by their IP address written in hex. And
        shortened one hex digit at a time. The #SYSTEM parameter will accept
        IP addresses written in the normal dotted-quad format and convert
        them to the pxelinux hex format.

    #SET name value
        Set a macro to expand to a particular value. Macro expansion is done
        with "$(name)". Macros are expanded in both the configuration file
        and in menus.

        Macros are allowed in directives in a couple of places. Where they
        are used in directives, their value is checked at the time the
        directive is parsed.

        Normally, macros are expanded just before the configuration files
        and menus are written.

        Undefined macros expand to the emtpy string and do not generate a
        warning.

        The "$" macro is pre-set to "$". "$($)" expands to "$".

    #FOR system-name #SET name value
        Set a macro for a specific system.

    #FOR $(name1) #SET name2 value
        For each system, if the macro $(name1) is defined, set the $(name2)
        macro. Macros are can be defined on a per-system basis so this might
        be used to set further options for a group of systems.

    #FOR system-name DIRECTIVE
        Pxelinux defines directives for its configuration file. The
        directive that is most likely to be overridden is the "DEFAULT"
        directive that specifies the default boot action.

    #FOR $(name) DIRECTIVE
        For each system, set the pxelinux directive if $(name) is defined.

    #MENU menu-name
        Append the following lines (until "#END") to the named menu. The
        menu names are: F1 F2 F3 F4 F5 F6 F7 F8 F9 DISPLAY. DISPLAY is the
        default menu that is automatically shown at startup.

        Genpxelinux.pl forces Menu F10 to be the same as initial menu
        (DISPLAY).

        Pxelinux supports some additional menus beyond F10 but these
        directives are not currently supported by genpxelinux.pl.

        Tabs will be converted to spaces because pxelinux doesn't display
        tabs correctly on most consoles.

    #MENU menu-name system-name
        Append the following lines to the named menu for a particular
        system.

    #MENU menu-name $(macro)
        For each system, append the following lines to the named menu if
        $(macro) is defined.

    #INCLUDE filename
        Parse filename as an additional configuration template. If filename
        happens be a directory, parse all of the files in the directory.

  LABEL SECTIONS
    Within a LABEL section, the following macros are supported:

    #ITEM item_description
        Add to the last menu modified by a "#MENU" directive a line like:

         item_name              item_description

        The "item_name" comes from the word after "LABEL".

    #ITEM menu_name item_description
        Add to a particular menu (F1 .. F9 or DISPLAY).

    #ITEM menu_name-system_name item_description.
        Add to a particular menu for a particular system.

    menu_name-$(macro) item_description.
        For each system, add to a particular menu if $(macro) is defined.

    #ITEM <item_name> item_description
        Override the item_name and add to the last menu modified by a
        "#MENU" directive.

    #ITEM menu_name-system_name <item_name> item_description.
        Override the item_name and add to a particular menu for a particular
        system.

    #ITEM menu_name-$(macro) <item_name> item_description.
        Override the item_name and for each system, add to a particular menu
        if $(macro) is defined.

FILES
    The default locations for things are:

     /tftpboot/pxelinux.cfg/template.gen
     /tftpboot/pxelinux.cfg/default
     /tftpboot/pxelinux.cfg/IP&ethernet-addresses
     /tftpboot/menus/*

SEE ALSO
    <http://syslinux.zytor.com/pxe.php>

LICENSE
    Copyright (C) 2007 David Muir Sharnoff <cpan@dave.sharnoff.org>
    Copyright (C) 2012 Google, Inc. This module may be used and distributed
    on the same terms as Perl itself.