Add preupload hook to remind people to use AOSP

[Hook Scripts]

aosp_hook = ${REPO_ROOT}/packages/services/Telecomm/scripts/aosp_tag_preupload.py ${PREUPLOAD_COMMIT}

#!/usr/bin/python

import re

import subprocess

import sys

# Looks for a string of the form [aosp/branch-name]

AOSP_BRANCH_REGEX = "\[aosp/[^\]]+\]"

AOSP_COMMIT_TAG_REGEX = "AOSP:"

AOSP_COMMIT_LINK_REGEX = "aosp/\d+"

AOSP_INFEASIBLE_REGEX = "Infeasible[ ]?\S+"

ERROR_MESSAGE = """

The source of truth for this project is AOSP. If you are uploading something to

a non-AOSP branch first, please provide a link in your commit message to the

corresponding patch in AOSP. The link should be formatted as follows:

  AOSP: aosp/<patch number>

If it's infeasible for the change to be included in AOSP (for example, if a

change contains confidential or security-sensitive information), please state

that it's infeasible and provide reasoning as follows:

  AOSP: Infeasible <your reasoning here>

"""

def main():

  if _is_in_aosp():

    sys.exit(0)

  commit_msg = subprocess.check_output(["git", "show",

                                        sys.argv[1], "--no-notes"])

  for commit_line in commit_msg.splitlines():

    if re.search(AOSP_COMMIT_TAG_REGEX, commit_line, re.IGNORECASE):

      _check_aosp_message(commit_line)

  print(ERROR_MESSAGE)

  sys.exit(1)

def _is_in_aosp():

  branch_info = subprocess.check_output(["git", "branch", "-vv"])

  return re.search(AOSP_BRANCH_REGEX, branch_info) is not None

def _check_aosp_message(aosp_line):

  if re.search(AOSP_COMMIT_LINK_REGEX, aosp_line):

    sys.exit(0)

  if re.search(AOSP_INFEASIBLE_REGEX, aosp_line, re.IGNORECASE):

    sys.exit(0)

  print(ERROR_MESSAGE)

  sys.exit(1)

if __name__ == '__main__':

  main()