Hi,

the way how kvm_autotest currently handle pre_command/post_command it 
don't allow to specify more than one command. BASH can handle this 
itself with a small change in the framework , as shown in the attachment.

In .cfg file we just change variable from:
  pre_command = "command"
to:
  pre_commane += "command &&"
produce:
  $(command && true)

Framework adds the last command true, which enclose whole command. This 
way we can chain infinite pre/post_commands without losing the return 
value (if something go wrong, other commands are not executed and return 
value is preserve.

example:
in cfg:
  pre_command += "echo A &&"
  pre_command += "echo B &&"
  pre_command += "echo C &&"
framework params.get("pre_command"):
  "echo A && echo B && echo C &&"
framework process_command execute on the host:
  "echo A && echo B && echo C && true"

regards,
Lukáš Doktor