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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
import select
class SSHProcess(object):
def __init__(self, **options):
self.defaultopts = {
"stdout": subprocess.PIPE,
"stderr": subprocess.STDOUT,
"stdin": None,
"shell": False,
"bufsize": -1,
"preexec_fn": os.setsid,
}
self.options = dict(self.defaultopts)
self.options.update(options)
self.status = None
self.output = None
self.process = None
self.starttime = None
self.logfile = None
# Unset DISPLAY which means we won't trigger SSH_ASKPASS
env = os.environ.copy()
if "DISPLAY" in env:
del env['DISPLAY']
self.options['env'] = env
def log(self, msg):
if self.logfile:
with open(self.logfile, "a") as f:
f.write("%s" % msg)
def _run(self, command, timeout=None, logfile=None):
self.logfile = logfile
self.starttime = time.time()
output = ''
self.process = subprocess.Popen(command, **self.options)
if timeout:
endtime = self.starttime + timeout
eof = False
while time.time() < endtime and not eof:
if select.select([self.process.stdout], [], [], 5)[0] != []:
data = os.read(self.process.stdout.fileno(), 1024)
if not data:
self.process.stdout.close()
eof = True
else:
output += data
self.log(data)
endtime = time.time() + timeout
# process hasn't returned yet
if not eof:
self.process.terminate()
time.sleep(5)
try:
self.process.kill()
except OSError:
pass
lastline = "\nProcess killed - no output for %d seconds. Total running time: %d seconds." % (timeout, time.time() - self.starttime)
self.log(lastline)
output += lastline
else:
output = self.process.communicate()[0]
self.log(output.rstrip())
self.status = self.process.wait()
self.output = output.rstrip()
def run(self, command, timeout=None, logfile=None):
try:
self._run(command, timeout, logfile)
except:
# Need to guard against a SystemExit or other exception occuring whilst running
# and ensure we don't leave a process behind.
if self.process.poll() is None:
self.process.kill()
self.status = self.process.wait()
raise
return (self.status, self.output)
class SSHControl(object):
def __init__(self, ip, logfile=None, timeout=300, user='root', port=None):
self.ip = ip
self.defaulttimeout = timeout
self.ignore_status = True
self.logfile = logfile
self.user = user
self.ssh_options = [
'-o', 'UserKnownHostsFile=/dev/null',
'-o', 'StrictHostKeyChecking=no',
'-o', 'LogLevel=ERROR'
]
self.ssh = ['ssh', '-l', self.user ] + self.ssh_options
self.scp = ['scp'] + self.ssh_options
if port:
self.ssh = self.ssh + [ '-p', port ]
self.scp = self.scp + [ '-P', port ]
def log(self, msg):
if self.logfile:
with open(self.logfile, "a") as f:
f.write("%s\n" % msg)
def _internal_run(self, command, timeout=None, ignore_status = True):
self.log("[Running]$ %s" % " ".join(command))
proc = SSHProcess()
status, output = proc.run(command, timeout, logfile=self.logfile)
self.log("[Command returned '%d' after %.2f seconds]" % (status, time.time() - proc.starttime))
if status and not ignore_status:
raise AssertionError("Command '%s' returned non-zero exit status %d:\n%s" % (command, status, output))
return (status, output)
def run(self, command, timeout=None):
"""
command - ssh command to run
timeout=<val> - kill command if there is no output after <val> seconds
timeout=None - kill command if there is no output after a default value seconds
timeout=0 - no timeout, let command run until it returns
"""
# We need to source /etc/profile for a proper PATH on the target
command = self.ssh + [self.ip, ' . /etc/profile; ' + command]
if timeout is None:
return self._internal_run(command, self.defaulttimeout, self.ignore_status)
if timeout == 0:
return self._internal_run(command, None, self.ignore_status)
return self._internal_run(command, timeout, self.ignore_status)
def copy_to(self, localpath, remotepath):
command = self.scp + [localpath, '%s@%s:%s' % (self.user, self.ip, remotepath)]
return self._internal_run(command, ignore_status=False)
def copy_from(self, remotepath, localpath):
command = self.scp + ['%s@%s:%s' % (self.user, self.ip, remotepath), localpath]
return self._internal_run(command, ignore_status=False)
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