tree adec43df3ded76e5f6cf13659ce89fc9b447f771
parent 4ab6af6787d7826e8c43282b5ad78b80b172d107
author Tao Bao <tbao@google.com> 1476745591 -0700
committer Tao Bao <tbao@google.com> 1476814609 -0700

build_verity_metadata: Support --signer_args argument.

Use argparse to parse input parameters for future extension.

Add 'build' and 'size' as two sub-commands.
- 'build_verity_metadata.py -s SIZE' becomes
  'build_verity_metadata.py size SIZE'.

- 'build_verity_metadata.py BLOCKS METADATA_IMAGE ...' becomes
  'build_verity_metadata.py build BLOCKS METADATA_IMAGE ...'.

The 'build' command now accepts an optional argument '--signer_args' to
specify signer specific arguments.

Bug: 31500665
Test: Building and signing work w/ and w/o --signer_args.

Change-Id: I3cfd2b584efad216b91d5fcd0314f4468ff7450f