Fix a few lint issues

asyncssh/__init__.py

@@ -122,6 +122,7 @@
 from . import sk_eddsa, sk_ecdsa, eddsa, ecdsa, rsa, dsa, kex_dh, kex_rsa
 
 __all__ = [
+    '__author__', '__author_email__', '__url__', '__version__',
     'BreakReceived', 'BytesOrStr', 'ChannelListenError',
     'ChannelOpenError', 'CompressionError', 'ConfigParseError',
     'ConnectionLost', 'DEVNULL', 'DataType', 'DisconnectError', 'Error',
@@ -136,15 +137,15 @@
     'SFTPDirNotEmpty', 'SFTPEOFError', 'SFTPError', 'SFTPFailure',
     'SFTPFileAlreadyExists', 'SFTPFileCorrupt', 'SFTPFileIsADirectory',
     'SFTPGroupInvalid', 'SFTPInvalidFilename', 'SFTPInvalidHandle',
-    'SFTPInvalidParameter', 'SFTPLinkLoop', 'SFTPLockConflict', 'SFTPName',
-    'SFTPNoConnection', 'SFTPNoMatchingByteRangeLock', 'SFTPNoMedia',
-    'SFTPNoSpaceOnFilesystem', 'SFTPNoSuchFile', 'SFTPNoSuchPath',
-    'SFTPNotADirectory', 'SFTPOpUnsupported', 'SFTPOwnerInvalid',
-    'SFTPPermissionDenied', 'SFTPQuotaExceeded', 'SFTPServer',
-    'SFTPServerFactory', 'SFTPUnknownPrincipal', 'SFTPVFSAttrs',
-    'SFTPWriteProtect', 'SSHAcceptor', 'SSHAgentClient', 'SSHAgentKeyPair',
-    'SSHAuthorizedKeys', 'SSHCertificate', 'SSHClient', 'SSHClientChannel',
-    'SSHClientConnection', 'SSHClientConnectionOptions',
+    'SFTPInvalidParameter', 'SFTPLimits', 'SFTPLinkLoop', 'SFTPLockConflict',
+    'SFTPName', 'SFTPNoConnection', 'SFTPNoMatchingByteRangeLock',
+    'SFTPNoMedia', 'SFTPNoSpaceOnFilesystem', 'SFTPNoSuchFile',
+    'SFTPNoSuchPath', 'SFTPNotADirectory', 'SFTPOpUnsupported',
+    'SFTPOwnerInvalid', 'SFTPPermissionDenied', 'SFTPQuotaExceeded',
+    'SFTPServer', 'SFTPServerFactory', 'SFTPUnknownPrincipal', 'SFTPVFSAttrs',
+    'SFTPWriteProtect', 'SSHAcceptHandler', 'SSHAcceptor', 'SSHAgentClient',
+    'SSHAgentKeyPair', 'SSHAuthorizedKeys', 'SSHCertificate', 'SSHClient',
+    'SSHClientChannel', 'SSHClientConnection', 'SSHClientConnectionOptions',
     'SSHClientProcess', 'SSHClientSession', 'SSHCompletedProcess',
     'SSHForwarder', 'SSHKey', 'SSHKeyPair', 'SSHKnownHosts',
     'SSHLineEditorChannel', 'SSHListener', 'SSHReader', 'SSHServer',

asyncssh/agent.py

@@ -21,7 +21,6 @@
 """SSH agent client"""
 
 import asyncio
-import errno
 import os
 import sys
 from types import TracebackType
@@ -58,17 +57,10 @@ async def wait_closed(self) -> None:
         """Wait for the connection to the SSH agent to close"""
 
 
-try:
-    if sys.platform == 'win32': # pragma: no cover
-        from .agent_win32 import open_agent
-    else:
-        from .agent_unix import open_agent
-except ImportError as _exc: # pragma: no cover
-    async def open_agent(agent_path: str) -> \
-            Tuple[AgentReader, AgentWriter]:
-        """Dummy function if we're unable to import agent support"""
-
-        raise OSError(errno.ENOENT, 'Agent support unavailable: %s' % str(_exc))
+if sys.platform == 'win32': # pragma: no cover
+    from .agent_win32 import open_agent
+else:
+    from .agent_unix import open_agent
 
 
 class _SupportsOpenAgentConnection(Protocol):

asyncssh/auth_keys.py

@@ -120,7 +120,7 @@ def _add_permitopen(self, option: str, value: str) -> None:
                 host = host[1:-1]
 
             port = None if port_str == '*' else int(port_str)
-        except:
+        except ValueError:
             raise ValueError('Illegal permitopen value: %s' % value) from None
 
         permitted_opens = cast(Set[Tuple[str, Optional[int]]],

asyncssh/crypto/__init__.py

@@ -57,3 +57,16 @@
     from .x509 import generate_x509_certificate, import_x509_certificate
 except (ImportError, AttributeError): # pragma: no cover
     pass
+
+__all__ = [
+    'BasicCipher', 'ChachaCipher', 'CryptoKey', 'Curve25519DH', 'Curve448DH',
+    'DH', 'DSAPrivateKey', 'DSAPublicKey', 'ECDH', 'ECDSAPrivateKey',
+    'ECDSAPublicKey', 'EdDSAPrivateKey', 'EdDSAPublicKey', 'GCMCipher', 'PQDH',
+    'PyCAKey', 'RSAPrivateKey', 'RSAPublicKey', 'chacha_available',
+    'curve25519_available', 'curve448_available', 'X509Certificate',
+    'X509Name', 'X509NamePattern', 'ed25519_available', 'ed448_available',
+    'generate_x509_certificate', 'get_cipher_params', 'import_x509_certificate',
+    'lookup_ec_curve_by_params', 'mlkem_available', 'pbkdf2_hmac',
+    'register_cipher', 'sntrup_available', 'umac32', 'umac64', 'umac96',
+    'umac128'
+]

asyncssh/scp.py

@@ -724,7 +724,7 @@ async def run(self, dstpath: _SCPPath) -> None:
                                              dstpath))
             else:
                 await self._recv_files(b'', dstpath)
-        except asyncio.CancelledError as exc:
+        except asyncio.CancelledError:
             cancelled = True
         except (OSError, SFTPError, ValueError) as exc:
             self.handle_error(exc)

asyncssh/sftp.py

@@ -2660,7 +2660,7 @@ async def start(self) -> None:
                 rcvd_extensions.append((name, data))
         except PacketDecodeError as exc:
             raise SFTPBadMessage(str(exc)) from None
-        except SFTPError as exc:
+        except SFTPError:
             raise
         except ConnectionLost as exc:
             raise SFTPConnectionLost(str(exc)) from None
@@ -5715,7 +5715,7 @@ async def _process_packet(self, pkttype: int, pktid: int,
                                    str(exc.reason))
 
             response = exc.encode(self._version)
-        except NotImplementedError as exc:
+        except NotImplementedError:
             assert handler is not None
 
             return_type = FXP_STATUS

asyncssh/sk.py

@@ -173,7 +173,7 @@ def sk_enroll(alg: int, application: bytes, user: str,
             raise ValueError('Invalid PIN') from None
         else:
             raise ValueError(str(exc)) from None
-    except ValueError as exc:
+    except ValueError:
         try:
             return _ctap1_enroll(dev, alg, application)
         except ApduError as exc: