# Copyright 2014 PerfKitBenchmarker Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""PerfKitBenchmarker version."""

import os.path
import subprocess
import perfkitbenchmarker
import pkg_resources


_STATIC_VERSION_FILE = 'version.txt'


def _GetVersion():
  """Gets the version from git or the static version file."""
  # Try to pull the version from git.
  root_dir = os.path.dirname(os.path.dirname(__file__))
  git_dir = os.path.join(root_dir, '.git')
  try:
    version = subprocess.check_output(
        ['git', '--git-dir', git_dir, 'describe', '--always'],
        stderr=subprocess.STDOUT,
        universal_newlines=True,
    )
  except (OSError, subprocess.CalledProcessError):
    # Could not get the version from git. Resort to contents of the static
    # version file.
    try:
      version = pkg_resources.resource_string(  # pytype: disable=not-callable
          perfkitbenchmarker.__name__,
          _STATIC_VERSION_FILE,
      )
    except OSError:
      # Could not determine version.
      return 'unknown'
  return version.rstrip('\n')


VERSION = _GetVersion()