[KVM_AUTOTEST][RFC] pre_command chaining

["Lukáš Doktor" <ldoktor@redhat.com>]

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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

[-- Attachment #2: command_chaining.patch --]
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diff -Narup kvm-autotest/client/tests/kvm/kvm_preprocessing.py kvm-autotest-new/client/tests/kvm/kvm_preprocessing.py
--- kvm-autotest/client/tests/kvm/kvm_preprocessing.py	2009-07-08 08:31:01.492284501 +0200
+++ kvm-autotest-new/client/tests/kvm/kvm_preprocessing.py	2009-07-10 13:18:35.407285172 +0200
@@ -229,7 +229,8 @@ def preprocess(test, params, env):
 
     #execute any pre_commands
     if params.get("pre_command"):
-        process_command(test, params, env, params.get("pre_command"),
+        process_command(test, params, env, 
+                        (params.get("pre_command") + " true"),
                         params.get("pre_command_timeout"),
                         params.get("pre_command_noncritical"))
 
@@ -287,7 +288,8 @@ def postprocess(test, params, env):
 
     #execute any post_commands
     if params.get("post_command"):
-        process_command(test, params, env, params.get("post_command"),
+        process_command(test, params, env,
+                        (params.get("post_command") + " true"),
                         params.get("post_command_timeout"),
                         params.get("post_command_noncritical"))