Isolinux menu.c32

What is ISOLINUX?

ISOLINUX is a boot loader for Linux/i386 that operates off ISO 9660/El Torito CD-ROMs in "no emulation" mode. This avoids the need to create an "emulation disk image" with limited space (for "floppy emulation") or compatibility problems (for "hard disk emulation".)

Here the original link http://www.syslinux.org/doc/menu.txt

There are two menu systems included with Syslinux, the advanced menu system, and the simple menu system.

THE ADVANCED MENU SYSTEM

The advanced menu system, written by Murali Krishnan Ganapathy, is located in the menu/ subdirectly. It allows the user to create hierarchial submenus, dynamic options, checkboxes, and just about anything you want. It requires that the menu is compiled from a simple C file, see menu/simple.c and menu/complex.c for examples.

The advanced menu system doesn't support serial console at this time.

See menu/README for more information.

THE SIMPLE MENU SYSTEM

The simple menu system is a single module located at com32/modules/vesamenu.c32 (graphical) or com32/modules/menu.c32 (text mode only). It uses the same configuration file as the regular Syslinux command line, and displays all the LABEL statements.

To use the menu system, simply make sure [vesa]menu.c32 is in the appropriate location for your boot medium (the same directory as the configuration file for SYSLINUX, EXTLINUX and ISOLINUX, and the same directory as pxelinux.0 for PXELINUX), and put the following options in your configuration file:

UI menu.c32

There are a few menu additions to the configuration file, all starting with the keywords MENU or TEXT; like the rest of the Syslinux config file language, it is case insensitive:

MENU TITLE title

Give the menu a title. The title is presented at the top of the menu.

MENU HIDDEN

Do not display the actual menu unless the user presses a key. All that is displayed is a timeout message.

MENU SEPARATOR

Insert an empty line in the menu.

MENU LABEL label

(Only valid after a LABEL statement.) Changes the label displayed for a specific entry. This allows you to have a label that isn't suitable for the command line, for example:

• Soft Cap Linux

LABEL softcap MENU LABEL Soft Cap ^Linux 9.6.36 KERNEL softcap-9.6.36.bzi APPEND whatever

• A very dense operating system

LABEL brick MENU LABEL ^Windows CE/ME/NT KERNEL chain.c32 APPEND hd0 2

The ^ symbol in a MENU LABEL statement defines a hotkey. The hotkey will be highlighted in the menu and will move the menu cursor immediately to that entry.

Reusing hotkeys is disallowed, subsequent entries will not be highlighted, and will not work.

Keep in mind that the LABELs, not MENU LABELs, must be unique, or odd things will happen to the command-line.

MENU INDENT count

(Only valid after a LABEL statement.) Will add "count" spaces in front of the displayed menu entry.

MENU DISABLE

(Only valid after a LABEL statement.) Makes the entry unselectable. This allows you to make a section in your menu with different options below it. for example:

• Entries for network boots

LABEL - MENU LABEL Network: MENU DISABLE

• Soft Cap Linux

LABEL softcap MENU LABEL Soft Cap ^Linux 9.6.36 MENU INDENT 1 KERNEL softcap-9.6.36.bzi APPEND whatever

• Dos 6.22

LABEL dos MENU LABEL ^Dos 6.22 MENU INDENT 1 KERNEL memdisk APPEND initrd=dos622.imz

• Separator

MENU SEPARATOR

• Entries for local boots

LABEL - MENU LABEL Local: MENU DISABLE

• Windows 2000

LABEL w2k MENU LABEL ^Windows 2000 MENU INDENT 1 KERNEL chain.c32 APPEND hd0 1

• Windows XP

LABEL xp MENU LABEL Windows ^XP MENU INDENT 1 KERNEL chain.c32 APPEND hd0 2

MENU HIDE

(Only valid after a LABEL statement.) Suppresses a particular LABEL entry from the menu.

MENU DEFAULT

(Only valid after a LABEL statement.)

Indicates that this entry should be the default for this particular submenu. See also the DEFAULT directive below.

TEXT HELP

Help text ... ... which can span multiple lines

ENDTEXT

(Only valid after a LABEL statement.)

Specifies a help text that should be displayed when a particular selection is highlighted.

MENU PASSWD passwd

(Only valid after a LABEL statement.)

Sets a password on this menu entry. "passwd" can be either a cleartext password, a SHA-1 encrypted password (starting with $4$), or and MD5 encrypted password (starting with $1$).

Use the included Perl scripts "sha1pass" or "md5pass" to encrypt passwords. MD5 passwords are compatible with most Unix password file utilities; SHA-1 passwords are probably unique to Syslinux. Obviously, if you don't encrypt your passwords they will not be very secure at all.

If you are using passwords, you want to make sure you also use the settings "NOESCAPE 1", "PROMPT 0", and either set "ALLOWOPTIONS 0" or use a master password (see below.)

If passwd is an empty string, this menu entry can only be unlocked with the master password.

MENU MASTER PASSWD passwd

Sets a master password. This password can be used to boot any menu entry, and is required for the [Tab] and [Esc] keys to work.

MENU BACKGROUND background

For vesamenu.c32, sets the background image. The background can either be a color (see MENU COLOR) or the name of an image file, which should be 640x480 pixels and either in PNG or JPEG format.

MENU BEGIN [tagname]

MENU END

Begin/end a submenu. The entries between MENU BEGIN and MENU END form a submenu, which is marked with a > mark on the right hand of the screen. Submenus inherit the properties of their parent menus, but can override them, and can thus have their own backgrounds, master passwords, titles, timeouts, messages and so forth.

MENU GOTO tagname

(Only valid after a LABEL statement.)

This label will transfer to the named submenu instead of booting anything. To transfer to the top-level menu, specify "menu goto .top".

MENU EXIT [tagname]

(Only valid after a label statement inside MENU BEGIN ... MENU END)

Exit to the next higher menu, or, if tagname is specified, to the named menu.

MENU QUIT

(Only valid after a LABEL statement.)

This label quits the menu system.

WARNING: if MENU MASTER PASSWD or ALLOWOPTIONS 0 is set, this will still allow exiting to the CLI; however, a separate MENU PASSWD can of course be set for this label.

MENU START

(Only valid inside MENU BEGIN ... MENU END)

Indicates that the menu system should start at the menu being defined instead of at the top-level menu. See also the DEFAULT directive below.

DEFAULT label

Set the global default. If "label" points into a submenu, that menu becomes the start menu; in other words, this directive has the same effect as both MENU DEFAULT and MENU START.

For backwards compatibility with earlier versions of Syslinux, this directive is ignored unless the configuration file also contains a UI directive.

Note: the CLI accepts options after the label, or even a non-label. The menu system does not support that.

INCLUDE filename [tagname]

MENU INCLUDE filename [tagname]

Include the contents of the configuration file filename at this point.

In the case of MENU INCLUDE, the included data is only seen by the menu system; the core syslinux code does not parse this command, so any labels defined in it are unavailable.

If a tagname is included, the whole file is considered to have been bracketed with a MENU BEGIN tagname ... MENU END pair, and will therefore show up as a submenu.

MENU AUTOBOOT message

Replaces the message "Automatic boot in # second{,s}...". The symbol # is replaced with the number of seconds remaining. The syntax "{singular,[dual,]plural}" can be used to conjugate appropriately.

MENU TABMSG message

Replaces the message "Press [Tab] to edit options".

MENU NOTABMSG message

Takes the place of the TABMSG message if option editing is disabled. Defaults to blank.

MENU PASSPROMPT message

Replaces the message "Password required".

MENU COLOR element ansi foreground background shadow

Sets the color of element "element" to the specified color sequence:

• screen Rest of the screen
• border Border area
• title Title bar
• unsel Unselected menu item
• hotkey Unselected hotkey
• sel Selection bar
• hotsel Selected hotkey
• disabled Disabled menu item
• scrollbar Scroll bar
• tabmsg Press [Tab] message
• cmdmark Command line marker
• cmdline Command line
• pwdborder Password box border
• pwdheader Password box header
• pwdentry Password box contents
• timeout_msg Timeout message
• timeout Timeout counter
• help Help text
• msgXX Message (F-key) file attribute XX

... where XX is two hexadecimal digits (the "plain text" is 07).

"ansi" is a sequence of semicolon-separated ECMA-48 Set Graphics Rendition (<ESC>[m) sequences:

• 0 reset all attributes to their defaults
• 1 set bold
• 4 set underscore (simulated with color on a color display)
• 5 set blink
• 7 set reverse video
• 22 set normal intensity
• 24 underline off
• 25 blink off
• 27 reverse video off
• 30 set black foreground
• 31 set red foreground
• 32 set green foreground
• 33 set brown foreground
• 34 set blue foreground
• 35 set magenta foreground
• 36 set cyan foreground
• 37 set white foreground
• 38 set underscore on, set default foreground color
• 39 set underscore off, set default foreground color
• 40 set black background
• 41 set red background
• 42 set green background
• 43 set brown background
• 44 set blue background
• 45 set magenta background
• 46 set cyan background
• 47 set white background
• 49 set default background color

These are used (a) in text mode, and (b) on the serial console.

"foreground" and "background" are color codes in #AARRGGBB notation, where AA RR GG BB are hexadecimal digits for alpha (opacity), red, green and blue, respectively. #00000000 represents fully transparent, and #ffffffff represents opaque white.

"shadow" controls the handling of the graphical console text shadow. Permitted values are "none" (no shadowing), "std" or "standard" (standard shadowing - foreground pixels are raised), "all" (both background and foreground raised), and "rev" or "reverse" (background pixels are raised.)

If any field is set to "*" or omitted (at the end of the line) then that field is left unchanged.

The current defaults are:

• menu color screen 37;40 #80ffffff #00000000 std
• menu color border 30;44 #40000000 #00000000 std
• menu color title 1;36;44 #c00090f0 #00000000 std
• menu color unsel 37;44 #90ffffff #00000000 std
• menu color hotkey 1;37;44 #ffffffff #00000000 std
• menu color sel 7;37;40 #e0000000 #20ff8000 all
• menu color hotsel 1;7;37;40 #e0400000 #20ff8000 all
• menu color disabled 1;30;44 #60cccccc #00000000 std
• menu color scrollbar 30;44 #40000000 #00000000 std
• menu color tabmsg 31;40 #90ffff00 #00000000 std
• menu color cmdmark 1;36;40 #c000ffff #00000000 std
• menu color cmdline 37;40 #c0ffffff #00000000 std
• menu color pwdborder 30;47 #80ffffff #20ffffff std
• menu color pwdheader 31;47 #80ff8080 #20ffffff std
• menu color pwdentry 30;47 #80ffffff #20ffffff std
• menu color timeout_msg 37;40 #80ffffff #00000000 std
• menu color timeout 1;37;40 #c0ffffff #00000000 std
• menu color help 37;40 #c0ffffff #00000000 std
• menu color msg07 37;40 #90ffffff #00000000 std

MENU MSGCOLOR fg_filter bg_filter shadow

Sets *all* the msgXX colors to a color scheme derived from the fg_filter and bg_filter values. Background color zero is always treated as transparent. The default corresponds to:

menu msgcolor #90ffffff #80ffffff std

This directive should come before any directive that customizes individual msgXX colors.

• MENU WIDTH 80
• MENU MARGIN 10
• MENU PASSWORDMARGIN 3
• MENU ROWS 12
• MENU TABMSGROW 18
• MENU CMDLINEROW 18
• MENU ENDROW -1
• MENU PASSWORDROW 11
• MENU TIMEOUTROW 20
• MENU HELPMSGROW 22
• MENU HELPMSGENDROW -1
• MENU HIDDENROW -2
• MENU HSHIFT 0
• MENU VSHIFT 0

These options control the layout of the menu on the screen. The values above are the defaults.

A negative value is relative to the calculated length of the screen (25 for text mode, 28 for VESA graphics mode.)

F1 textfile background

...

F12 textfile background

Displays full-screen help (also available at the command line.) The same control code sequences as in the command line interface are supported, although some are ignored.

Additionally, a second argument allows a different background image (see MENU BACKGROUND for supported formats) to be displayed.

The menu system honours the TIMEOUT command; if TIMEOUT is specified it will execute the ONTIMEOUT command if one exists, otherwise it will pick the default menu option.

Normally, the user can press [Tab] to edit the menu entry, and [Esc] to return to the Syslinux command line. However, if the configuration file specifies ALLOWOPTIONS 0, these keys will be disabled, and if MENU MASTER PASSWD is set, they require the master password.

The simple menu system supports serial console, using the normal SERIAL directive. However, it can be quite slow over a slow serial link; you probably want to set your baudrate to 38400 or higher if possible. It requires a Linux/VT220/ANSI-compatible terminal on the other end.

USING AN ALTERNATE CONFIGURATION FILE

It is also possible to load a secondary configuration file, to get to another menu. To do that, invoke menu.c32 with the name of the secondary configuration file.

LABEL othermenu MENU LABEL Another Menu KERNEL menu.c32 APPEND othermenu.conf

If you specify more than one file, they will all be read, in the order specified. The dummy filename ~ (tilde) is replaced with the filename of the main configuration file.

# The file graphics.conf contains common color and layout commands for
# all menus.
LABEL othermenu

MENU LABEL Another Menu KERNEL vesamenu.c32 APPEND graphics.conf othermenu.conf

# Return to the main menu
LABEL mainmenu

MENU LABEL Return to Main Menu KERNEL vesamenu.c32 APPEND graphics.conf ~

See also the MENU INCLUDE directive above.