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# Copyright (C) 2021 The Android Open Source Project
#
# 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.
"""This module contains functions used to fetch files from various sources."""
import subprocess
import sys
from urllib.parse import urlparse
from urllib.request import urlopen
def fetch_file(url, verbose=False):
"""Fetch a file from the specified source using the appropriate protocol.
Returns:
The contents of the file as bytes.
"""
scheme = urlparse(url).scheme
if scheme == 'gs':
cmd = ['gsutil', 'cat', url]
try:
result = subprocess.run(
cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
check=True)
if result.stderr and verbose:
print('warning: non-fatal error running "gsutil": %s' % result.stderr,
file=sys.stderr)
return result.stdout
except subprocess.CalledProcessError as e:
print('fatal: error running "gsutil": %s' % e.stderr,
file=sys.stderr)
sys.exit(1)
with urlopen(url) as f:
return f.read()
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