def _init_connection(remote_cmd):
"""Run remote_cmd, register connection, and then return it
If remote_cmd is None, then the local connection will be
returned. This also updates some settings on the remote side,
like global settings, its connection number, and verbosity.
"""
global _processes
if not remote_cmd:
return Globals.local_connection
log.Log("Executing remote command {rc}".format(rc=_safe_str(remote_cmd)),
log.INFO)
try:
# we need buffered read on SSH communications, hence using
# default value for bufsize parameter
if os.name == 'nt':
# FIXME workaround because python 3.7 doesn't yet accept bytes
process = subprocess.Popen(os.fsdecode(remote_cmd),
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
else:
process = subprocess.Popen(remote_cmd,
shell=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
(stdin, stdout) = (process.stdin, process.stdout)
# only to avoid resource warnings about subprocess still running
_processes.append(process)
except OSError:
(stdin, stdout) = (None, None)
conn_number = len(Globals.connections)
conn = connection.PipeConnection(stdout, stdin, conn_number)
if not _validate_connection_version(conn, remote_cmd):
return None
log.Log("Registering connection {co}".format(co=conn_number), log.DEBUG)
_init_connection_routing(conn, conn_number, remote_cmd)
_init_connection_settings(conn)
return conn
def run(self):
return connection.PipeConnection(sys.stdin.buffer,
sys.stdout.buffer).Server()