Merge lp://qastaging/~liuyq0307/lava-android-test/command-file into lp://qastaging/lava-android-test

32 + if self.args.android_command and self.args.command_file:
33 + raise LavaCommandError("Please specified one option of -c and -f")
34 + if not self.args.android_command and not self.args.command_file:
35 + raise LavaCommandError("Please specified one option of -c and -f")

You should use mutex group instead:

group = parser.add_mutually_exclusive_group()
group.add_argument('-f', ...)
group.add_argument('-c', ...)

Then argparse will this check for you.

53 + STEPS_HOST_PRE = ["wget %s -O %s" % (file_url, file_name)]

I'd like us to use python on the host if possible. Downloading stuff with wget eventually means we have no error handling. This can stay as-is but we should look at the problem of how we download anything throughout lava and fix it.

+ if self.args.android_command and self.args.command_file:
39 + raise LavaCommandError("Please specified one option of -c and -f")
40 + if not self.args.android_command and not self.args.command_file:
41 + raise LavaCommandError("Please specified one option of -c and -f")

This won't be need if you indicate that both -c and -f are required

add_argument( ..., required=True)

Otherwise looks okay