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# Copyright 2019 Google LLC
#
# 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.
"""Module to get the the name of a git repo containing a specific commit
inside of an OSS-Fuzz project.
Example Usage:
python detect_repo.py --src_dir /src --example_commit
b534f03eecd8a109db2b085ab24d419b6486de97
Prints the location of the git remote repo as well as the repo's name
seperated by a space.
https://github.com/VirusTotal/yara.git yara
"""
import argparse
import logging
import os
import subprocess
def main():
"""Function to get a git repo's url and name referenced by OSS-Fuzz
Dockerfile.
Raises:
ValueError when a commit or a ref is not provided.
"""
parser = argparse.ArgumentParser(
description=
'Finds a specific git repo in an oss-fuzz project\'s docker file.')
parser.add_argument('--repo_name', help='The name of the git repo.')
parser.add_argument('--src_dir', help='The location of the possible repo.')
parser.add_argument('--example_commit',
help='A commit SHA referencing the project\'s main repo.')
args = parser.parse_args()
if not args.repo_name and not args.example_commit:
raise ValueError(
'Requires an example commit or a repo name to find repo location.')
if args.src_dir:
src_dir = args.src_dir
else:
src_dir = os.environ.get('SRC', '/src')
for single_dir in os.listdir(src_dir):
full_path = os.path.join(src_dir, single_dir)
if not os.path.isdir(full_path):
continue
if args.example_commit and check_for_commit(full_path, args.example_commit):
print('Detected repo:', get_repo(full_path), full_path)
return
if args.repo_name and check_for_repo_name(full_path, args.repo_name):
print('Detected repo:', get_repo(full_path), full_path)
return
logging.error('No git repos with specific commit: %s found in %s',
args.example_commit, src_dir)
def get_repo(repo_path):
"""Gets a git repo link from a specific directory in a docker image.
Args:
repo_path: The directory on the image where the git repo exists.
Returns:
The repo location or None.
"""
output, return_code = execute(['git', 'config', '--get', 'remote.origin.url'],
location=repo_path,
check_result=True)
if return_code == 0 and output:
return output.rstrip()
return None
def check_for_repo_name(repo_path, repo_name):
"""Check to see if the repo_name matches the remote repository repo name.
Args:
repo_path: The directory of the git repo.
repo_name: The name of the target git repo.
"""
if not os.path.exists(os.path.join(repo_path, '.git')):
return False
out, _ = execute(['git', 'config', '--get', 'remote.origin.url'],
location=repo_path)
out = out.split('/')[-1].replace('.git', '').rstrip()
return out == repo_name
def check_for_commit(repo_path, commit):
"""Checks a directory for a specific commit.
Args:
repo_path: The name of the directory to test for the commit.
commit: The commit SHA to check for.
Returns:
True if directory contains that commit.
"""
# Check if valid git repo.
if not os.path.exists(os.path.join(repo_path, '.git')):
return False
# Check if history fetch is needed.
if os.path.exists(os.path.join(repo_path, '.git', 'shallow')):
execute(['git', 'fetch', '--unshallow'], location=repo_path)
# Check if commit is in history.
_, return_code = execute(['git', 'cat-file', '-e', commit],
location=repo_path)
return return_code == 0
def execute(command, location, check_result=False):
"""Runs a shell command in the specified directory location.
Args:
command: The command as a list to be run.
location: The directory the command is run in.
check_result: Should an exception be thrown on failed command.
Returns:
The stdout of the command, the error code.
Raises:
RuntimeError: running a command resulted in an error.
"""
process = subprocess.Popen(command, stdout=subprocess.PIPE, cwd=location)
output, err = process.communicate()
if check_result and (process.returncode or err):
raise RuntimeError(
'Error: %s\n running command: %s\n return code: %s\n out %s\n' %
(err, command, process.returncode, output))
if output is not None:
output = output.decode('ascii')
return output, process.returncode
if __name__ == '__main__':
main()
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