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# Copyright (C) 2013 Intel Corporation
#
# Released under the MIT license (see COPYING.MIT)
# Provides a class for setting up ssh connections,
# running commands and copying files to/from a target.
# It's used by testimage.bbclass and tests in lib/oeqa/runtime.
import subprocess
import time
import os
class SSHControl(object):
def __init__(self, host=None, timeout=300, logfile=None):
self.host = host
self.timeout = timeout
self._out = ''
self._ret = 126
self.logfile = logfile
self.ssh_options = [
'-o', 'UserKnownHostsFile=/dev/null',
'-o', 'StrictHostKeyChecking=no',
'-o', 'LogLevel=ERROR'
]
self.ssh = ['ssh', '-l', 'root'] + self.ssh_options
def log(self, msg):
if self.logfile:
with open(self.logfile, "a") as f:
f.write("%s\n" % msg)
def _internal_run(self, cmd):
# We need this for a proper PATH
cmd = ". /etc/profile; " + cmd
command = self.ssh + [self.host, cmd]
self.log("[Running]$ %s" % " ".join(command))
# ssh hangs without os.setsid
proc = subprocess.Popen(command, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, preexec_fn=os.setsid)
return proc
def run(self, cmd, timeout=None):
"""Run cmd and get it's return code and output.
Let it run for timeout seconds and then terminate/kill it,
if time is 0 will let cmd run until it finishes.
Time can be passed to here or can be set per class instance."""
if self.host:
sshconn = self._internal_run(cmd)
else:
raise Exception("Remote IP hasn't been set: '%s'" % actualcmd)
if timeout == 0:
self._out = sshconn.communicate()[0]
self._ret = sshconn.poll()
else:
if timeout is None:
tdelta = self.timeout
else:
tdelta = timeout
endtime = time.time() + tdelta
while sshconn.poll() is None and time.time() < endtime:
time.sleep(1)
# process hasn't returned yet
if sshconn.poll() is None:
self._ret = 255
sshconn.terminate()
sshconn.kill()
self._out = sshconn.stdout.read()
sshconn.stdout.close()
self._out += "\n[!!! SSH command timed out after %d seconds and it was killed]" % tdelta
self.log("[!!! SSH command timed out after %d seconds and it was killed]" % tdelta)
else:
self._out = sshconn.stdout.read()
self._ret = sshconn.poll()
# strip the last LF so we can test the output
self._out = self._out.rstrip()
self.log("%s" % self._out)
self.log("[SSH command returned]: %s" % self._ret)
return (self._ret, self._out)
def _internal_scp(self, cmd):
cmd = ['scp'] + self.ssh_options + cmd
self.log("[Running SCP]$ %s" % " ".join(cmd))
scpconn = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, preexec_fn=os.setsid)
out = scpconn.communicate()[0]
ret = scpconn.poll()
self.log("%s" % out)
if ret != 0:
# we raise an exception so that tests fail in setUp and setUpClass without a need for an assert
raise Exception("Error running %s, output: %s" % ( " ".join(cmd), out))
return (ret, out)
def copy_to(self, localpath, remotepath):
actualcmd = [localpath, 'root@%s:%s' % (self.host, remotepath)]
return self._internal_scp(actualcmd)
def copy_from(self, remotepath, localpath):
actualcmd = ['root@%s:%s' % (self.host, remotepath), localpath]
return self._internal_scp(actualcmd)
def get_status(self):
return self._ret
def get_output(self):
return self._out
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