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[main] Add the "scriptlet" setting

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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>
This commit is contained in:
Michael Brown
2011-03-28 18:48:48 +01:00
parent b5f5f735c1
commit 2f6e7bde77
2 changed files with 27 additions and 5 deletions
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9
src/include/ipxe/dhcp.h
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@@ -307,10 +307,17 @@ struct dhcp_client_uuid {
#define DHCP_EB_SKIP_SAN_BOOT DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x09 )
/*
* Tags in the range 0x10-0x7f are reserved for feature markers
* Tags in the range 0x10-0x4f are reserved for feature markers
*
*/
/** Scriptlet
*
* If a scriptlet exists, it will be executed in place of the usual
* call to autoboot()
*/
#define DHCP_EB_SCRIPTLET DHCP_ENCAP_OPT ( DHCP_EB_ENCAP, 0x51 )
/** Skip PXE DHCP protocol extensions such as ProxyDHCP
*
* If set to a non-zero value, iPXE will not wait for ProxyDHCP offers