86 lines
2.8 KiB
Python
86 lines
2.8 KiB
Python
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import tarfile
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from tempfile import TemporaryFile, mkdtemp
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from zipfile import ZipFile
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from util.dockerfileparse import parse_dockerfile, ParsedDockerfile
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class BuildPackageException(Exception):
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""" Exception raised when retrieving or parsing a build package. """
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pass
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class BuildPackage(object):
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""" Helper class for easy reading and updating of a Dockerfile build pack. """
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def __init__(self, requests_file):
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self._mime_processors = {
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'application/zip': BuildPack.__prepare_zip,
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'application/x-zip-compressed': BuildPack.__prepare_zip,
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'text/plain': BuildPack.__prepare_dockerfile,
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'application/octet-stream': BuildPack.__prepare_dockerfile,
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'application/x-tar': BuildPack.__prepare_tarball,
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'application/gzip': BuildPack.__prepare_tarball,
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'application/x-gzip': BuildPack.__prepare_tarball,
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}
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c_type = buildpack_resource.headers['content-type']
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c_type = c_type.split(';')[0] if ';' in c_type else c_type
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if c_type not in self._mime_processors:
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raise BuildPackageException('Unknown build package mime type: %s' % c_type)
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self._package_directory = None
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try:
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self._package_directory = self._mime_processors[c_type](requests_file)
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except Exception as ex:
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raise BuildPackageException(ex.message)
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def parse_dockerfile(self, build_subdirectory):
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dockerfile_path = os.path.join(self._package_directory, subdirectory, 'Dockerfile')
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if not os.path.exists(dockerfile_path):
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if subdirectory:
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message = 'Build package did not contain a Dockerfile at sub directory %s.' % subdirectory
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else:
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message = 'Build package did not contain a Dockerfile at the root directory.'
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raise BuildPackageException(message)
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with open(dockerfile_path, 'r') as dockerfileobj:
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return parse_dockerfile(dockerfileobj.read())
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@classmethod
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def from_url(url):
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buildpack_resource = requests.get(buildpack_url, stream=True)
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return BuildPackage(buildpack_resource, c_type)
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@staticmethod
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def __prepare_zip(request_file):
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build_dir = mkdtemp(prefix='docker-build-')
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# Save the zip file to temp somewhere
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with TemporaryFile() as zip_file:
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zip_file.write(request_file.content)
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to_extract = ZipFile(zip_file)
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to_extract.extractall(build_dir)
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return build_dir
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@staticmethod
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def __prepare_dockerfile(request_file):
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build_dir = mkdtemp(prefix='docker-build-')
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dockerfile_path = os.path.join(build_dir, "Dockerfile")
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with open(dockerfile_path, 'w') as dockerfile:
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dockerfile.write(request_file.content)
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return build_dir
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@staticmethod
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def __prepare_tarball(request_file):
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build_dir = mkdtemp(prefix='docker-build-')
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# Save the zip file to temp somewhere
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with tarfile.open(mode='r|*', fileobj=request_file.raw) as tar_stream:
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safe_extractall(tar_stream, build_dir)
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return build_dir
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