mirror of https://github.com/docker/docker-py.git
95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
import errno
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import json
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import shutil
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import subprocess
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import warnings
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from . import constants
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from . import errors
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from .utils import create_environment_dict
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class Store:
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def __init__(self, program, environment=None):
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""" Create a store object that acts as an interface to
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perform the basic operations for storing, retrieving
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and erasing credentials using `program`.
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"""
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self.program = constants.PROGRAM_PREFIX + program
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self.exe = shutil.which(self.program)
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self.environment = environment
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if self.exe is None:
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warnings.warn(
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f'{self.program} not installed or not available in PATH',
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stacklevel=1,
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)
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def get(self, server):
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""" Retrieve credentials for `server`. If no credentials are found,
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a `StoreError` will be raised.
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"""
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if not isinstance(server, bytes):
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server = server.encode('utf-8')
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data = self._execute('get', server)
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result = json.loads(data.decode('utf-8'))
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# docker-credential-pass will return an object for inexistent servers
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# whereas other helpers will exit with returncode != 0. For
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# consistency, if no significant data is returned,
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# raise CredentialsNotFound
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if result['Username'] == '' and result['Secret'] == '':
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raise errors.CredentialsNotFound(
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f'No matching credentials in {self.program}'
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)
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return result
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def store(self, server, username, secret):
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""" Store credentials for `server`. Raises a `StoreError` if an error
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occurs.
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"""
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data_input = json.dumps({
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'ServerURL': server,
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'Username': username,
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'Secret': secret
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}).encode('utf-8')
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return self._execute('store', data_input)
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def erase(self, server):
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""" Erase credentials for `server`. Raises a `StoreError` if an error
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occurs.
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"""
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if not isinstance(server, bytes):
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server = server.encode('utf-8')
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self._execute('erase', server)
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def list(self):
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""" List stored credentials. Requires v0.4.0+ of the helper.
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"""
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data = self._execute('list', None)
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return json.loads(data.decode('utf-8'))
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def _execute(self, subcmd, data_input):
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if self.exe is None:
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raise errors.StoreError(
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f'{self.program} not installed or not available in PATH'
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)
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output = None
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env = create_environment_dict(self.environment)
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try:
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output = subprocess.check_output(
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[self.exe, subcmd], input=data_input, env=env,
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)
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except subprocess.CalledProcessError as e:
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raise errors.process_store_error(e, self.program) from e
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except OSError as e:
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if e.errno == errno.ENOENT:
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raise errors.StoreError(
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f'{self.program} not installed or not available in PATH'
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) from e
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else:
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raise errors.StoreError(
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f'Unexpected OS error "{e.strerror}", errno={e.errno}'
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) from e
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return output
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