How to detect available download protocols or build options inside an iPXE script?

[mcb30]

(2016-02-05 01:08)robzr Wrote:  Is it possible, within an iPXE script, to base a conditional statement (or variable value) on whether or not a download protocol is available in the iPXE instance that is running?
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I know I could first try the HTTP and then fall back on the TFTP statement if it fails, but the output of this is messy.

Sorry; there's no way to do this in the scripting language. The DHCP server can test on the basis of the feature flags exposed via option 175 in the DHCPDISCOVER/DHCPREQUEST, but those same flags aren't visible to a script. As you guessed, testing options via e.g. ${175.19} won't work because it will be looking for that option in the server response rather than in the client request.

Michael