from paramiko import RSAKey, SSHClient, AutoAddPolicy
from paramiko.ssh_exception import SSHException, NoValidConnectionsError
from robot.api import logger
-from scp import SCPClient
+from scp import SCPClient, SCPException
__all__ = ["exec_cmd", "exec_cmd_no_error"]
raise IOError('Unable to connect to port {port} on {host}'.
format(port=node['port'], host=node['host']))
- def disconnect(self, node):
+ def disconnect(self, node=None):
"""Close SSH connection to the node.
- :param node: The node to disconnect from.
- :type node: dict
+ :param node: The node to disconnect from. None means last connected.
+ :type node: dict or None
"""
+ if node is None:
+ node = self._node
+ if node is None:
+ return
node_hash = self._node_hash(node)
if node_hash in SSH.__existing_connections:
logger.debug('Disconnecting peer: {host}, {port}'.
:param cmd: Command to run on the Node.
:param timeout: Maximal time in seconds to wait until the command is
done. If set to None then wait forever.
- :type cmd: str
+ :type cmd: str or OptionString
:type timeout: int
:return return_code, stdout, stderr
:rtype: tuple(int, str, str)
:raise SSHTimeout: If command is not finished in timeout time.
"""
+ cmd = str(cmd)
stdout = StringIO.StringIO()
stderr = StringIO.StringIO()
try:
logger.trace('SCP took {0} seconds'.format(end-start))
-def exec_cmd(node, cmd, timeout=600, sudo=False):
+def exec_cmd(node, cmd, timeout=600, sudo=False, disconnect=False):
"""Convenience function to ssh/exec/return rc, out & err.
Returns (rc, stdout, stderr).
:param cmd: Command to execute.
:param timeout: Timeout value in seconds. Default: 600.
:param sudo: Sudo privilege execution flag. Default: False.
+ :param disconnect: Close the opened SSH connection if True.
:type node: dict
- :type cmd: str
+ :type cmd: str or OptionString
:type timeout: int
:type sudo: bool
+ :type disconnect: bool
:returns: RC, Stdout, Stderr.
:rtype: tuple(int, str, str)
"""
except SSHException as err:
logger.error(repr(err))
return None, None, None
+ finally:
+ if disconnect:
+ ssh.disconnect()
return ret_code, stdout, stderr
-def exec_cmd_no_error(node, cmd, timeout=600, sudo=False, message=None):
+def exec_cmd_no_error(
+ node, cmd, timeout=600, sudo=False, message=None, disconnect=False,
+ retries=0):
"""Convenience function to ssh/exec/return out & err.
Verifies that return code is zero.
+ Supports retries, timeout is related to each try separately then. There is
+ sleep(1) before each retry.
+ Disconnect (if enabled) is applied after each try.
:param node: DUT node.
:param cmd: Command to be executed.
:param timeout: Timeout value in seconds. Default: 600.
:param sudo: Sudo privilege execution flag. Default: False.
:param message: Error message in case of failure. Default: None.
+ :param disconnect: Close the opened SSH connection if True.
+ :param retries: How many times to retry on failure.
:type node: dict
- :type cmd: str
+ :type cmd: str or OptionString
:type timeout: int
:type sudo: bool
:type message: str
+ :type disconnect: bool
+ :type retries: int
:returns: Stdout, Stderr.
:rtype: tuple(str, str)
:raises RuntimeError: If bash return code is not 0.
"""
- ret_code, stdout, stderr = exec_cmd(node, cmd, timeout=timeout, sudo=sudo)
- msg = ('Command execution failed: "{cmd}"\n{stderr}'.
- format(cmd=cmd, stderr=stderr) if message is None else message)
- if ret_code != 0:
+ for _ in range(retries + 1):
+ ret_code, stdout, stderr = exec_cmd(
+ node, cmd, timeout=timeout, sudo=sudo, disconnect=disconnect)
+ if ret_code == 0:
+ break
+ sleep(1)
+ else:
+ msg = ('Command execution failed: "{cmd}"\n{stderr}'.
+ format(cmd=cmd, stderr=stderr) if message is None else message)
raise RuntimeError(msg)
return stdout, stderr
+
+def scp_node(
+ node, local_path, remote_path, get=False, timeout=30, disconnect=False):
+ """Copy files from local_path to remote_path or vice versa.
+
+ :param node: SUT node.
+ :param local_path: Path to local file that should be uploaded; or
+ path where to save remote file.
+ :param remote_path: Remote path where to place uploaded file; or
+ path to remote file which should be downloaded.
+ :param get: scp operation to perform. Default is put.
+ :param timeout: Timeout value in seconds.
+ :param disconnect: Close the opened SSH connection if True.
+ :type node: dict
+ :type local_path: str
+ :type remote_path: str
+ :type get: bool
+ :type timeout: int
+ :type disconnect: bool
+ :raises RuntimeError: If SSH connection failed or SCP transfer failed.
+ """
+ ssh = SSH()
+
+ try:
+ ssh.connect(node)
+ except SSHException:
+ raise RuntimeError('Failed to connect to {host}!'
+ .format(host=node['host']))
+ try:
+ ssh.scp(local_path, remote_path, get, timeout)
+ except SCPException:
+ raise RuntimeError('SCP execution failed on {host}!'
+ .format(host=node['host']))
+ finally:
+ if disconnect:
+ ssh.disconnect()
Code Review / csit.git / blobdiff