def _get_host_ip(
host: str,
ssh_config_path: str = "~/.ssh/config"
) -> Union[IPv4Address, IPv6Address]:
"""
1. If host.name is a short alias,
we assume there is a corresponding record in `~/.ssh/config`:
1.1 If the corresponding `HOSTNAME` value is an IP address,
return it as the result.
1.2 If the corresponding `HOSTNAME` is a domain,
return the IP of the domain,
assuming the domain is accessible from the local machine.
2. If host.name is a domain, return its IP,
assuming the domain is accessible from the local machine.
3. Else raise an ValueError.
"""
posix_path: PosixPath = PosixPath(ssh_config_path)
path_with_user_expanded: PosixPath = posix_path.expanduser()
config: SSHConfig = SSHConfig.from_path(str(path_with_user_expanded))
# If `host.name` does not exist in `~/.ssh/config`,
# `config.lookup(host.name)['hostname']` returns `host.name` itself.
hostname: str = config.lookup(host)["hostname"]
ip: Union[IPv4Address, IPv6Address]
try:
ip = ip_address(hostname)
except ValueError:
return ip_address(socket.gethostbyname(hostname))
else:
return ip
def __power_off_linux():
cfg = SSHConfig.from_path(Path.home() / ".ssh" / "config")\
.lookup(SSH_INSTANCE)
ssh = SSHClient()
ssh.set_missing_host_key_policy(AutoAddPolicy())
ssh.connect(
**{
"hostname": cfg.get("hostname"),
"port": cfg.get("port") or 22,
"username": cfg.get("user"),
"password": cfg.get("password"),
"key_filename": cfg.get("identityfile"),
})
ssh.exec_command("sudo poweroff")