brillo CLI: Normalize brick/blueprint input.

This adds some additional types for ArgumentParser args to support
normalizing blueprint/brick/BSP paths and putting in some smarts to
help the user easily specify targets.

blueprint_path:
  * If not a path, put in //blueprints.
  * Add .json extension if not already present.
  * Convert to workspace locator if not already.

brick_path:
  * If not a path, put in //bricks.
  * Convert to workspace locator if not already.

bsp_path:
  * If not a path, put in //bsps.
  * Convert to workspace locator if not already.

This allows the user to more easily specify bricks and blueprints, so
that the following two commands will be equivalent:
  $ brillo xxx --blueprint //blueprints/foo.json --brick //bricks/bar
  $ brillo xxx --blueprint foo --brick bar

BUG=brillo:907, brillo:931
TEST=cbuildbot/run_tests
TEST=brillo brick create foo
     brillo brick create //bsps/bar
     brillo blueprint create fooprint --bsp bar --brick foo

Change-Id: I0707f0681e646b7d2bf9dd4717ef37b68e1b64fd
Reviewed-on: https://chromium-review.googlesource.com/268449
Reviewed-by: David Pursell <dpursell@chromium.org>
Commit-Queue: David Pursell <dpursell@chromium.org>
Trybot-Ready: David Pursell <dpursell@chromium.org>
Tested-by: David Pursell <dpursell@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/cros/cros_deploy.py b/cli/cros/cros_deploy.py
index 5c87f8e50..424280b92 100644
--- a/cli/cros/cros_deploy.py
+++ b/cli/cros/cros_deploy.py
@@ -57,7 +57,7 @@ For more information of cros build usage:
         help='The board to use. By default it is automatically detected. You '
         'can override the detected board with this option.')
     target.add_argument(
-        '--brick',
+        '--brick', type='brick_path',
         help='The brick to use. Will be detected from CWD if possible and take '
         'precedence over the detected board.')
     parser.add_argument(