[script] Implement "goto" in iPXE scripts

Allow script labels to be defined using the syntax

  :<labelname>

(nothing else allowed on the line, including whitespace).  Labels are
ignored during script execution, but can be used as the target of the
"goto" command.  For example:

  #!ipxe

  goto machine_${net0/ip} || goto machine_default

  # Linux kernel boot
  :machine_10.0.0.101
  :machine_10.0.0.102
  set filename http://my.boot.server/vmlinuz
  goto done

  # Default configuration
  :machine_default
  set filename pxelinux.0
  goto done

  # Boot selected configuration
  :done
  chain ${filename}

Originally-implemented-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Originally-implemented-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

0 files changed, 0 insertions, 0 deletions