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"""Convenience classes for paramiko"""
import stat
from typing import List
import paramiko
from paramiko.channel import Channel
class SSHError(paramiko.ssh_exception.SSHException):
"""Raised by ``SSHConn`` on errors"""
class CmdResult:
"""Return type for ``SSHConn.run()``
Attributes:
stdout (str)
stderr (str)
rcode (int)
"""
def __init__(self, conn, cmd: str):
chan: Channel
chan = conn.get_transport().open_session()
chan.set_environment_variable('shell', 'xterm')
chan.exec_command(cmd)
stdout = chan.makefile('rb', -1)
stderr = chan.makefile_stderr('rb', -1)
self.stdout = stdout.read()
self.stderr = stderr.read()
if self.stderr.startswith(b'stdin: is not a tty\n'):
# this is caused by 'mesg y' in /etc/bashrc. Using a pty would
# avoid that, but then mix stdout and stderr which is not wanted.
self.stderr = self.stderr[20:]
self.stdout = str(self.stdout, 'utf-8', errors='surrogateescape')
self.stderr = str(self.stderr, 'utf-8', errors='surrogateescape')
self.rcode = chan.recv_exit_status()
chan.close()
class SSHConn(paramiko.SSHClient):
"""Context manager that handles SSH connections
**Arguments are the same as paramiko.SSHClient.connect, but with one extra
argument, "sftp"**
Args:
sftp (bool): whether to enable SFTP and listdir
features on connect
Raises:
SSHError: on failure to connect
Attributes:
sftp: A paramiko.SFTPClient object, or None
"""
def __init__(self, sftp: bool, **kwargs):
"""Args for the context manager are read from here.
If you don't need sftp functionality, set sftp=False"""
super().__init__()
self.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self._kwargs = kwargs
self._use_sftp = sftp
self.sftp = None
def __enter__(self):
"""Connects to SSH using the context manager 'with' statement"""
try:
self.connect(**self._kwargs)
if self._use_sftp:
self.sftp = self.open_sftp()
except Exception as exc:
raise SSHError(exc) from exc
return self
def __exit__(self, exc_type, exc_val, traceback):
"""Disconnects from SSH on un-indent, even if an exception is raised"""
if self._use_sftp:
self.sftp.close()
self.close()
def listdir(self, path: str) -> List[str]:
"""List contents of a remote dir similar to os.listdir()
Args:
path: remote path to browse
Raises:
SSHError
"""
return self._listdir(path, _type=None)
def ls_dirs(self, path: str) -> List[str]:
"""listdir() but only return directories
Args:
path: remote path to browse
Raises:
SSHError
"""
return self._listdir(path, _type=stat.S_ISDIR)
def ls_files(self, path: str) -> List[str]:
"""listdir() but only return regular files
Args:
path: remote path to browse
Raises:
SSHError
"""
return self._listdir(path, _type=stat.S_ISREG)
def _listdir(self, path, _type):
try:
items = []
for lstat in self.sftp.listdir_iter(path):
if _type is None or _type(lstat.st_mode):
items.append(lstat.filename)
return items
except Exception as exc:
raise SSHError(exc) from exc
def run(self, cmd: str) -> CmdResult:
"""Execute a remote command over SSH
Args:
cmd: command to run
Raises:
SSHError
"""
try:
return CmdResult(self, cmd)
except Exception as exc:
raise SSHError(exc) from exc