[main] Add the "scriptlet" setting
A scriptlet is a single iPXE command that can be stored in non-volatile option storage and used to override the default "autoboot" behaviour without having to reflash the iPXE image. For example, a scriptlet could contain autoboot || reboot to instruct iPXE to reboot the system if booting fails. Unlike an embedded image, the presence of a scriptlet does not inhibit the initial "Press Ctrl-B..." prompt. This allows the user to recover from setting a faulty scriptlet. Originally-implemented-by: Glenn Brown <glenn@myri.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -15,6 +15,7 @@ Literature dealing with the network protocols:
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdio.h>
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#include <stdlib.h>
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#include <ipxe/init.h>
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#include <ipxe/features.h>
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#include <ipxe/shell.h>
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@ -28,6 +29,14 @@ FILE_LICENCE ( GPL2_OR_LATER );
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#define BOLD "\033[1m"
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#define CYAN "\033[36m"
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/** The "scriptlet" setting */
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struct setting scriptlet_setting __setting ( SETTING_MISC ) = {
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.name = "scriptlet",
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.description = "Boot scriptlet",
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.tag = DHCP_EB_SCRIPTLET,
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.type = &setting_type_string,
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};
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/**
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* Prompt for shell entry
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*
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@ -51,6 +60,7 @@ static int shell_banner ( void ) {
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__asmcall int main ( void ) {
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struct feature *feature;
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struct image *image;
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char *scriptlet;
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/* Some devices take an unreasonably long time to initialise */
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printf ( PRODUCT_SHORT_NAME " initialising devices..." );
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@ -82,11 +92,16 @@ __asmcall int main ( void ) {
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if ( ( image = first_image() ) != NULL ) {
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/* We have an embedded image; execute it */
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image_exec ( image );
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} else if ( shell_banner() ) {
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/* User wants shell; just give them a shell */
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shell();
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} else {
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/* Prompt for shell */
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if ( shell_banner() ) {
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/* User wants shell; just give them a shell */
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shell();
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fetch_string_setting_copy ( NULL, &scriptlet_setting,
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&scriptlet );
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if ( scriptlet ) {
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/* User has defined a scriptlet; execute it */
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system ( scriptlet );
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free ( scriptlet );
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} else {
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/* Try booting. If booting fails, offer the
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* user another chance to enter the shell.
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@ -307,10 +307,17 @@ struct dhcp_client_uuid {
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#define DHCP_EB_SKIP_SAN_BOOT DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x09 )
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/*
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* Tags in the range 0x10-0x7f are reserved for feature markers
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* Tags in the range 0x10-0x4f are reserved for feature markers
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*
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*/
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/** Scriptlet
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*
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* If a scriptlet exists, it will be executed in place of the usual
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* call to autoboot()
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*/
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#define DHCP_EB_SCRIPTLET DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x51 )
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/** Skip PXE DHCP protocol extensions such as ProxyDHCP
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*
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* If set to a non-zero value, iPXE will not wait for ProxyDHCP offers
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