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gerrit-public.fairphone.software / platform / external / autotest / b7d6b02e35ef877ad2184f8fe72b7c46a902dde7 / . / client / common_lib / utils.py
blob: f2476c84924b5a33c49da84a7d0147d05a9d267f [file] [log] [blame]
# Copyright (c) 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Convenience functions for use by tests or whomever.
There's no really good way to do this, as this isn't a class we can do
inheritance with, just a collection of static methods.
"""
# pylint: disable=missing-docstring
import StringIO
import collections
import datetime
import errno
import inspect
import itertools
import logging
import os
import pickle
import Queue
import random
import re
import resource
import select
import shutil
import signal
import socket
import string
import struct
import subprocess
import textwrap
import threading
import time
import urllib2
import urlparse
import uuid
import warnings
try:
import hashlib
except ImportError:
import md5
import sha
import common
from autotest_lib.client.common_lib import env
from autotest_lib.client.common_lib import error
from autotest_lib.client.common_lib import global_config
from autotest_lib.client.common_lib import logging_manager
from autotest_lib.client.common_lib import metrics_mock_class
from autotest_lib.client.cros import constants
# pylint: disable=wildcard-import
from autotest_lib.client.common_lib.lsbrelease_utils import *
def deprecated(func):
"""This is a decorator which can be used to mark functions as deprecated.
It will result in a warning being emmitted when the function is used."""
def new_func(*args, **dargs):
warnings.warn("Call to deprecated function %s." % func.__name__,
category=DeprecationWarning)
return func(*args, **dargs)
new_func.__name__ = func.__name__
new_func.__doc__ = func.__doc__
new_func.__dict__.update(func.__dict__)
return new_func
class _NullStream(object):
def write(self, data):
pass
def flush(self):
pass
TEE_TO_LOGS = object()
_the_null_stream = _NullStream()
DEVNULL = object()
DEFAULT_STDOUT_LEVEL = logging.DEBUG
DEFAULT_STDERR_LEVEL = logging.ERROR
# prefixes for logging stdout/stderr of commands
STDOUT_PREFIX = '[stdout] '
STDERR_PREFIX = '[stderr] '
# safe characters for the shell (do not need quoting)
SHELL_QUOTING_WHITELIST = frozenset(string.ascii_letters +
string.digits +
'_-+=')
def custom_warning_handler(message, category, filename, lineno, file=None,
line=None):
"""Custom handler to log at the WARNING error level. Ignores |file|."""
logging.warning(warnings.formatwarning(message, category, filename, lineno,
line))
warnings.showwarning = custom_warning_handler
def get_stream_tee_file(stream, level, prefix=''):
if stream is None:
return _the_null_stream
if stream is DEVNULL:
return None
if stream is TEE_TO_LOGS:
return logging_manager.LoggingFile(level=level, prefix=prefix)
return stream
def _join_with_nickname(base_string, nickname):
if nickname:
return '%s BgJob "%s" ' % (base_string, nickname)
return base_string
# TODO: Cleanup and possibly eliminate |unjoinable|, which is only used in our
# master-ssh connection process, while fixing underlying
# semantics problem in BgJob. See crbug.com/279312
class BgJob(object):
def __init__(self, command, stdout_tee=None, stderr_tee=None, verbose=True,
stdin=None, stdout_level=DEFAULT_STDOUT_LEVEL,
stderr_level=DEFAULT_STDERR_LEVEL, nickname=None,
unjoinable=False, env=None, extra_paths=None):
"""Create and start a new BgJob.
This constructor creates a new BgJob, and uses Popen to start a new
subprocess with given command. It returns without blocking on execution
of the subprocess.
After starting a new BgJob, use output_prepare to connect the process's
stdout and stderr pipes to the stream of your choice.
When the job is running, the jobs's output streams are only read from
when process_output is called.
@param command: command to be executed in new subprocess. May be either
a list, or a string (in which case Popen will be called
with shell=True)
@param stdout_tee: (Optional) a file like object, TEE_TO_LOGS or
DEVNULL.
If not given, after finishing the process, the
stdout data from subprocess is available in
result.stdout.
If a file like object is given, in process_output(),
the stdout data from the subprocess will be handled
by the given file like object.
If TEE_TO_LOGS is given, in process_output(), the
stdout data from the subprocess will be handled by
the standard logging_manager.
If DEVNULL is given, the stdout of the subprocess
will be just discarded. In addition, even after
cleanup(), result.stdout will be just an empty
string (unlike the case where stdout_tee is not
given).
@param stderr_tee: Same as stdout_tee, but for stderr.
@param verbose: Boolean, make BgJob logging more verbose.
@param stdin: Stream object, will be passed to Popen as the new
process's stdin.
@param stdout_level: A logging level value. If stdout_tee was set to
TEE_TO_LOGS, sets the level that tee'd
stdout output will be logged at. Ignored
otherwise.
@param stderr_level: Same as stdout_level, but for stderr.
@param nickname: Optional string, to be included in logging messages
@param unjoinable: Optional bool, default False.
This should be True for BgJobs running in background
and will never be joined with join_bg_jobs(), such
as the master-ssh connection. Instead, it is
caller's responsibility to terminate the subprocess
correctly, e.g. by calling nuke_subprocess().
This will lead that, calling join_bg_jobs(),
process_output() or cleanup() will result in an
InvalidBgJobCall exception.
Also, |stdout_tee| and |stderr_tee| must be set to
DEVNULL, otherwise InvalidBgJobCall is raised.
@param env: Dict containing environment variables used in subprocess.
@param extra_paths: Optional string list, to be prepended to the PATH
env variable in env (or os.environ dict if env is
not specified).
"""
self.command = command
self.unjoinable = unjoinable
if (unjoinable and (stdout_tee != DEVNULL or stderr_tee != DEVNULL)):
raise error.InvalidBgJobCall(
'stdout_tee and stderr_tee must be DEVNULL for '
'unjoinable BgJob')
self._stdout_tee = get_stream_tee_file(
stdout_tee, stdout_level,
prefix=_join_with_nickname(STDOUT_PREFIX, nickname))
self._stderr_tee = get_stream_tee_file(
stderr_tee, stderr_level,
prefix=_join_with_nickname(STDERR_PREFIX, nickname))
self.result = CmdResult(command)
# allow for easy stdin input by string, we'll let subprocess create
# a pipe for stdin input and we'll write to it in the wait loop
if isinstance(stdin, basestring):
self.string_stdin = stdin
stdin = subprocess.PIPE
else:
self.string_stdin = None
# Prepend extra_paths to env['PATH'] if necessary.
if extra_paths:
env = (os.environ if env is None else env).copy()
oldpath = env.get('PATH')
env['PATH'] = os.pathsep.join(
extra_paths + ([oldpath] if oldpath else []))
if verbose:
logging.debug("Running '%s'", command)
if type(command) == list:
shell = False
executable = None
else:
shell = True
executable = '/bin/bash'
with open('/dev/null', 'w') as devnull:
self.sp = subprocess.Popen(
command,
stdin=stdin,
stdout=devnull if stdout_tee == DEVNULL else subprocess.PIPE,
stderr=devnull if stderr_tee == DEVNULL else subprocess.PIPE,
preexec_fn=self._reset_sigpipe,
shell=shell, executable=executable,
env=env, close_fds=True)
self._cleanup_called = False
self._stdout_file = (
None if stdout_tee == DEVNULL else StringIO.StringIO())
self._stderr_file = (
None if stderr_tee == DEVNULL else StringIO.StringIO())
def process_output(self, stdout=True, final_read=False):
"""Read from process's output stream, and write data to destinations.
This function reads up to 1024 bytes from the background job's
stdout or stderr stream, and writes the resulting data to the BgJob's
output tee and to the stream set up in output_prepare.
Warning: Calls to process_output will block on reads from the
subprocess stream, and will block on writes to the configured
destination stream.
@param stdout: True = read and process data from job's stdout.
False = from stderr.
Default: True
@param final_read: Do not read only 1024 bytes from stream. Instead,
read and process all data until end of the stream.
"""
if self.unjoinable:
raise error.InvalidBgJobCall('Cannot call process_output on '
'a job with unjoinable BgJob')
if stdout:
pipe, buf, tee = (
self.sp.stdout, self._stdout_file, self._stdout_tee)
else:
pipe, buf, tee = (
self.sp.stderr, self._stderr_file, self._stderr_tee)
if not pipe:
return
if final_read:
# read in all the data we can from pipe and then stop
data = []
while select.select([pipe], [], [], 0)[0]:
data.append(os.read(pipe.fileno(), 1024))
if len(data[-1]) == 0:
break
data = "".join(data)
else:
# perform a single read
data = os.read(pipe.fileno(), 1024)
buf.write(data)
tee.write(data)
def cleanup(self):
"""Clean up after BgJob.
Flush the stdout_tee and stderr_tee buffers, close the
subprocess stdout and stderr buffers, and saves data from
the configured stdout and stderr destination streams to
self.result. Duplicate calls ignored with a warning.
"""
if self.unjoinable:
raise error.InvalidBgJobCall('Cannot call cleanup on '
'a job with a unjoinable BgJob')
if self._cleanup_called:
logging.warning('BgJob [%s] received a duplicate call to '
'cleanup. Ignoring.', self.command)
return
try:
if self.sp.stdout:
self._stdout_tee.flush()
self.sp.stdout.close()
self.result.stdout = self._stdout_file.getvalue()
if self.sp.stderr:
self._stderr_tee.flush()
self.sp.stderr.close()
self.result.stderr = self._stderr_file.getvalue()
finally:
self._cleanup_called = True
def _reset_sigpipe(self):
if not env.IN_MOD_WSGI:
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
def ip_to_long(ip):
# !L is a long in network byte order
return struct.unpack('!L', socket.inet_aton(ip))[0]
def long_to_ip(number):
# See above comment.
return socket.inet_ntoa(struct.pack('!L', number))
def create_subnet_mask(bits):
return (1 << 32) - (1 << 32-bits)
def format_ip_with_mask(ip, mask_bits):
masked_ip = ip_to_long(ip) & create_subnet_mask(mask_bits)
return "%s/%s" % (long_to_ip(masked_ip), mask_bits)
def normalize_hostname(alias):
ip = socket.gethostbyname(alias)
return socket.gethostbyaddr(ip)[0]
def get_ip_local_port_range():
match = re.match(r'\s*(\d+)\s*(\d+)\s*$',
read_one_line('/proc/sys/net/ipv4/ip_local_port_range'))
return (int(match.group(1)), int(match.group(2)))
def set_ip_local_port_range(lower, upper):
write_one_line('/proc/sys/net/ipv4/ip_local_port_range',
'%d %d\n' % (lower, upper))
def read_one_line(filename):
f = open(filename, 'r')
try:
return f.readline().rstrip('\n')
finally:
f.close()
def read_file(filename):
f = open(filename)
try:
return f.read()
finally:
f.close()
def get_field(data, param, linestart="", sep=" "):
"""
Parse data from string.
@param data: Data to parse.
example:
data:
cpu 324 345 34 5 345
cpu0 34 11 34 34 33
^^^^
start of line
params 0 1 2 3 4
@param param: Position of parameter after linestart marker.
@param linestart: String to which start line with parameters.
@param sep: Separator between parameters regular expression.
"""
search = re.compile(r"(?<=^%s)\s*(.*)" % linestart, re.MULTILINE)
find = search.search(data)
if find != None:
return re.split("%s" % sep, find.group(1))[param]
else:
print "There is no line which starts with %s in data." % linestart
return None
def write_one_line(filename, line):
open_write_close(filename, str(line).rstrip('\n') + '\n')
def open_write_close(filename, data):
f = open(filename, 'w')
try:
f.write(data)
finally:
f.close()
def locate_file(path, base_dir=None):
"""Locates a file.
@param path: The path of the file being located. Could be absolute or
relative path. For relative path, it tries to locate the file from
base_dir.
@param base_dir (optional): Base directory of the relative path.
@returns Absolute path of the file if found. None if path is None.
@raises error.TestFail if the file is not found.
"""
if path is None:
return None
if not os.path.isabs(path) and base_dir is not None:
# Assume the relative path is based in autotest directory.
path = os.path.join(base_dir, path)
if not os.path.isfile(path):
raise error.TestFail('ERROR: Unable to find %s' % path)
return path
def matrix_to_string(matrix, header=None):
"""
Return a pretty, aligned string representation of a nxm matrix.
This representation can be used to print any tabular data, such as
database results. It works by scanning the lengths of each element
in each column, and determining the format string dynamically.
@param matrix: Matrix representation (list with n rows of m elements).
@param header: Optional tuple or list with header elements to be displayed.
"""
if type(header) is list:
header = tuple(header)
lengths = []
if header:
for column in header:
lengths.append(len(column))
for row in matrix:
for i, column in enumerate(row):
column = unicode(column).encode("utf-8")
cl = len(column)
try:
ml = lengths[i]
if cl > ml:
lengths[i] = cl
except IndexError:
lengths.append(cl)
lengths = tuple(lengths)
format_string = ""
for length in lengths:
format_string += "%-" + str(length) + "s "
format_string += "\n"
matrix_str = ""
if header:
matrix_str += format_string % header
for row in matrix:
matrix_str += format_string % tuple(row)
return matrix_str
def read_keyval(path, type_tag=None):
"""
Read a key-value pair format file into a dictionary, and return it.
Takes either a filename or directory name as input. If it's a
directory name, we assume you want the file to be called keyval.
@param path: Full path of the file to read from.
@param type_tag: If not None, only keyvals with key ending
in a suffix {type_tag} will be collected.
"""
if os.path.isdir(path):
path = os.path.join(path, 'keyval')
if not os.path.exists(path):
return {}
if type_tag:
pattern = r'^([-\.\w]+)\{%s\}=(.*)$' % type_tag
else:
pattern = r'^([-\.\w]+)=(.*)$'
keyval = {}
f = open(path)
for line in f:
line = re.sub('#.*', '', line).rstrip()
if not line:
continue
match = re.match(pattern, line)
if match:
key = match.group(1)
value = match.group(2)
if re.search('^\d+$', value):
value = int(value)
elif re.search('^(\d+\.)?\d+$', value):
value = float(value)
keyval[key] = value
else:
raise ValueError('Invalid format line: %s' % line)
f.close()
return keyval
def write_keyval(path, dictionary, type_tag=None):
"""
Write a key-value pair format file out to a file. This uses append
mode to open the file, so existing text will not be overwritten or
reparsed.
If type_tag is None, then the key must be composed of alphanumeric
characters (or dashes+underscores). However, if type-tag is not
null then the keys must also have "{type_tag}" as a suffix. At
the moment the only valid values of type_tag are "attr" and "perf".
@param path: full path of the file to be written
@param dictionary: the items to write
@param type_tag: see text above
"""
if os.path.isdir(path):
path = os.path.join(path, 'keyval')
keyval = open(path, 'a')
if type_tag is None:
key_regex = re.compile(r'^[-\.\w]+$')
else:
if type_tag not in ('attr', 'perf'):
raise ValueError('Invalid type tag: %s' % type_tag)
escaped_tag = re.escape(type_tag)
key_regex = re.compile(r'^[-\.\w]+\{%s\}$' % escaped_tag)
try:
for key in sorted(dictionary.keys()):
if not key_regex.search(key):
raise ValueError('Invalid key: %s' % key)
keyval.write('%s=%s\n' % (key, dictionary[key]))
finally:
keyval.close()
def is_url(path):
"""Return true if path looks like a URL"""
# for now, just handle http and ftp
url_parts = urlparse.urlparse(path)
return (url_parts[0] in ('http', 'ftp'))
def urlopen(url, data=None, timeout=5):
"""Wrapper to urllib2.urlopen with timeout addition."""
# Save old timeout
old_timeout = socket.getdefaulttimeout()
socket.setdefaulttimeout(timeout)
try:
return urllib2.urlopen(url, data=data)
finally:
socket.setdefaulttimeout(old_timeout)
def urlretrieve(url, filename, data=None, timeout=300):
"""Retrieve a file from given url."""
logging.debug('Fetching %s -> %s', url, filename)
src_file = urlopen(url, data=data, timeout=timeout)
try:
dest_file = open(filename, 'wb')
try:
shutil.copyfileobj(src_file, dest_file)
finally:
dest_file.close()
finally:
src_file.close()
def hash(hashtype, input=None):
"""
Returns an hash object of type md5 or sha1. This function is implemented in
order to encapsulate hash objects in a way that is compatible with python
2.4 and python 2.6 without warnings.
Note that even though python 2.6 hashlib supports hash types other than
md5 and sha1, we are artificially limiting the input values in order to
make the function to behave exactly the same among both python
implementations.
@param input: Optional input string that will be used to update the hash.
"""
# pylint: disable=redefined-builtin
if hashtype not in ['md5', 'sha1']:
raise ValueError("Unsupported hash type: %s" % hashtype)
try:
computed_hash = hashlib.new(hashtype)
except NameError:
if hashtype == 'md5':
computed_hash = md5.new()
elif hashtype == 'sha1':
computed_hash = sha.new()
if input:
computed_hash.update(input)
return computed_hash
def get_file(src, dest, permissions=None):
"""Get a file from src, which can be local or a remote URL"""
if src == dest:
return
if is_url(src):
urlretrieve(src, dest)
else:
shutil.copyfile(src, dest)
if permissions:
os.chmod(dest, permissions)
return dest
def unmap_url(srcdir, src, destdir='.'):
"""
Receives either a path to a local file or a URL.
returns either the path to the local file, or the fetched URL
unmap_url('/usr/src', 'foo.tar', '/tmp')
= '/usr/src/foo.tar'
unmap_url('/usr/src', 'http://site/file', '/tmp')
= '/tmp/file'
(after retrieving it)
"""
if is_url(src):
url_parts = urlparse.urlparse(src)
filename = os.path.basename(url_parts[2])
dest = os.path.join(destdir, filename)
return get_file(src, dest)
else:
return os.path.join(srcdir, src)
def update_version(srcdir, preserve_srcdir, new_version, install,
*args, **dargs):
"""
Make sure srcdir is version new_version
If not, delete it and install() the new version.
In the preserve_srcdir case, we just check it's up to date,
and if not, we rerun install, without removing srcdir
"""
versionfile = os.path.join(srcdir, '.version')
install_needed = True
if os.path.exists(versionfile):
old_version = pickle.load(open(versionfile))
if old_version == new_version:
install_needed = False
if install_needed:
if not preserve_srcdir and os.path.exists(srcdir):
shutil.rmtree(srcdir)
install(*args, **dargs)
if os.path.exists(srcdir):
pickle.dump(new_version, open(versionfile, 'w'))
def get_stderr_level(stderr_is_expected, stdout_level=DEFAULT_STDOUT_LEVEL):
if stderr_is_expected:
return stdout_level
return DEFAULT_STDERR_LEVEL
def run(command, timeout=None, ignore_status=False, stdout_tee=None,
stderr_tee=None, verbose=True, stdin=None, stderr_is_expected=None,
stdout_level=None, stderr_level=None, args=(), nickname=None,
ignore_timeout=False, env=None, extra_paths=None):
"""
Run a command on the host.
@param command: the command line string.
@param timeout: time limit in seconds before attempting to kill the
running process. The run() function will take a few seconds
longer than 'timeout' to complete if it has to kill the process.
@param ignore_status: do not raise an exception, no matter what the exit
code of the command is.
@param stdout_tee: optional file-like object to which stdout data
will be written as it is generated (data will still be stored
in result.stdout unless this is DEVNULL).
@param stderr_tee: likewise for stderr.
@param verbose: if True, log the command being run.
@param stdin: stdin to pass to the executed process (can be a file
descriptor, a file object of a real file or a string).
@param stderr_is_expected: if True, stderr will be logged at the same level
as stdout
@param stdout_level: logging level used if stdout_tee is TEE_TO_LOGS;
if None, a default is used.
@param stderr_level: like stdout_level but for stderr.
@param args: sequence of strings of arguments to be given to the command
inside " quotes after they have been escaped for that; each
element in the sequence will be given as a separate command
argument
@param nickname: Short string that will appear in logging messages
associated with this command.
@param ignore_timeout: If True, timeouts are ignored otherwise if a
timeout occurs it will raise CmdTimeoutError.
@param env: Dict containing environment variables used in a subprocess.
@param extra_paths: Optional string list, to be prepended to the PATH
env variable in env (or os.environ dict if env is
not specified).
@return a CmdResult object or None if the command timed out and
ignore_timeout is True
@raise CmdError: the exit code of the command execution was not 0
@raise CmdTimeoutError: the command timed out and ignore_timeout is False.
"""
if isinstance(args, basestring):
raise TypeError('Got a string for the "args" keyword argument, '
'need a sequence.')
# In some cases, command will actually be a list
# (For example, see get_user_hash in client/cros/cryptohome.py.)
# So, to cover that case, detect if it's a string or not and convert it
# into one if necessary.
if not isinstance(command, basestring):
command = ' '.join([sh_quote_word(arg) for arg in command])
command = ' '.join([command] + [sh_quote_word(arg) for arg in args])
if stderr_is_expected is None:
stderr_is_expected = ignore_status
if stdout_level is None:
stdout_level = DEFAULT_STDOUT_LEVEL
if stderr_level is None:
stderr_level = get_stderr_level(stderr_is_expected, stdout_level)
try:
bg_job = join_bg_jobs(
(BgJob(command, stdout_tee, stderr_tee, verbose, stdin=stdin,
stdout_level=stdout_level, stderr_level=stderr_level,
nickname=nickname, env=env, extra_paths=extra_paths),),
timeout)[0]
except error.CmdTimeoutError:
if not ignore_timeout:
raise
return None
if not ignore_status and bg_job.result.exit_status:
raise error.CmdError(command, bg_job.result,
"Command returned non-zero exit status")
return bg_job.result
def run_parallel(commands, timeout=None, ignore_status=False,
stdout_tee=None, stderr_tee=None,
nicknames=None):
"""
Behaves the same as run() with the following exceptions:
- commands is a list of commands to run in parallel.
- ignore_status toggles whether or not an exception should be raised
on any error.
@return: a list of CmdResult objects
"""
bg_jobs = []
if nicknames is None:
nicknames = []
for (command, nickname) in itertools.izip_longest(commands, nicknames):
bg_jobs.append(BgJob(command, stdout_tee, stderr_tee,
stderr_level=get_stderr_level(ignore_status),
nickname=nickname))
# Updates objects in bg_jobs list with their process information
join_bg_jobs(bg_jobs, timeout)
for bg_job in bg_jobs:
if not ignore_status and bg_job.result.exit_status:
raise error.CmdError(command, bg_job.result,
"Command returned non-zero exit status")
return [bg_job.result for bg_job in bg_jobs]
@deprecated
def run_bg(command):
"""Function deprecated. Please use BgJob class instead."""
bg_job = BgJob(command)
return bg_job.sp, bg_job.result
def join_bg_jobs(bg_jobs, timeout=None):
"""Joins the bg_jobs with the current thread.
Returns the same list of bg_jobs objects that was passed in.
"""
if any(bg_job.unjoinable for bg_job in bg_jobs):
raise error.InvalidBgJobCall(
'join_bg_jobs cannot be called for unjoinable bg_job')
timeout_error = False
try:
# We are holding ends to stdin, stdout pipes
# hence we need to be sure to close those fds no mater what
start_time = time.time()
timeout_error = _wait_for_commands(bg_jobs, start_time, timeout)
for bg_job in bg_jobs:
# Process stdout and stderr
bg_job.process_output(stdout=True,final_read=True)
bg_job.process_output(stdout=False,final_read=True)
finally:
# close our ends of the pipes to the sp no matter what
for bg_job in bg_jobs:
bg_job.cleanup()
if timeout_error:
# TODO: This needs to be fixed to better represent what happens when
# running in parallel. However this is backwards compatable, so it will
# do for the time being.
raise error.CmdTimeoutError(
bg_jobs[0].command, bg_jobs[0].result,
"Command(s) did not complete within %d seconds" % timeout)
return bg_jobs
def _wait_for_commands(bg_jobs, start_time, timeout):
"""Waits for background jobs by select polling their stdout/stderr.
@param bg_jobs: A list of background jobs to wait on.
@param start_time: Time used to calculate the timeout lifetime of a job.
@param timeout: The timeout of the list of bg_jobs.
@return: True if the return was due to a timeout, False otherwise.
"""
# To check for processes which terminate without producing any output
# a 1 second timeout is used in select.
SELECT_TIMEOUT = 1
read_list = []
write_list = []
reverse_dict = {}
for bg_job in bg_jobs:
if bg_job.sp.stdout:
read_list.append(bg_job.sp.stdout)
reverse_dict[bg_job.sp.stdout] = (bg_job, True)
if bg_job.sp.stderr:
read_list.append(bg_job.sp.stderr)
reverse_dict[bg_job.sp.stderr] = (bg_job, False)
if bg_job.string_stdin is not None:
write_list.append(bg_job.sp.stdin)
reverse_dict[bg_job.sp.stdin] = bg_job
if timeout:
stop_time = start_time + timeout
time_left = stop_time - time.time()
else:
time_left = None # so that select never times out
while not timeout or time_left > 0:
# select will return when we may write to stdin, when there is
# stdout/stderr output we can read (including when it is
# EOF, that is the process has terminated) or when a non-fatal
# signal was sent to the process. In the last case the select returns
# EINTR, and we continue waiting for the job if the signal handler for
# the signal that interrupted the call allows us to.
try:
read_ready, write_ready, _ = select.select(read_list, write_list,
[], SELECT_TIMEOUT)
except select.error as v:
if v[0] == errno.EINTR:
logging.warning(v)
continue
else:
raise
# os.read() has to be used instead of
# subproc.stdout.read() which will otherwise block
for file_obj in read_ready:
bg_job, is_stdout = reverse_dict[file_obj]
bg_job.process_output(is_stdout)
for file_obj in write_ready:
# we can write PIPE_BUF bytes without blocking
# POSIX requires PIPE_BUF is >= 512
bg_job = reverse_dict[file_obj]
file_obj.write(bg_job.string_stdin[:512])
bg_job.string_stdin = bg_job.string_stdin[512:]
# no more input data, close stdin, remove it from the select set
if not bg_job.string_stdin:
file_obj.close()
write_list.remove(file_obj)
del reverse_dict[file_obj]
all_jobs_finished = True
for bg_job in bg_jobs:
if bg_job.result.exit_status is not None:
continue
bg_job.result.exit_status = bg_job.sp.poll()
if bg_job.result.exit_status is not None:
# process exited, remove its stdout/stdin from the select set
bg_job.result.duration = time.time() - start_time
if bg_job.sp.stdout:
read_list.remove(bg_job.sp.stdout)
del reverse_dict[bg_job.sp.stdout]
if bg_job.sp.stderr:
read_list.remove(bg_job.sp.stderr)
del reverse_dict[bg_job.sp.stderr]
else:
all_jobs_finished = False
if all_jobs_finished:
return False
if timeout:
time_left = stop_time - time.time()
# Kill all processes which did not complete prior to timeout
for bg_job in bg_jobs:
if bg_job.result.exit_status is not None:
continue
logging.warning('run process timeout (%s) fired on: %s', timeout,
bg_job.command)
if nuke_subprocess(bg_job.sp) is None:
# If process could not be SIGKILL'd, log kernel stack.
logging.warning(read_file('/proc/%d/stack' % bg_job.sp.pid))
bg_job.result.exit_status = bg_job.sp.poll()
bg_job.result.duration = time.time() - start_time
return True
def pid_is_alive(pid):
"""
True if process pid exists and is not yet stuck in Zombie state.
Zombies are impossible to move between cgroups, etc.
pid can be integer, or text of integer.
"""
path = '/proc/%s/stat' % pid
try:
stat = read_one_line(path)
except IOError:
if not os.path.exists(path):
# file went away
return False
raise
return stat.split()[2] != 'Z'
def signal_pid(pid, sig):
"""
Sends a signal to a process id. Returns True if the process terminated
successfully, False otherwise.
"""
try:
os.kill(pid, sig)
except OSError:
# The process may have died before we could kill it.
pass
for _ in range(5):
if not pid_is_alive(pid):
return True
time.sleep(1)
# The process is still alive
return False
def nuke_subprocess(subproc):
# check if the subprocess is still alive, first
if subproc.poll() is not None:
return subproc.poll()
# the process has not terminated within timeout,
# kill it via an escalating series of signals.
signal_queue = [signal.SIGTERM, signal.SIGKILL]
for sig in signal_queue:
signal_pid(subproc.pid, sig)
if subproc.poll() is not None:
return subproc.poll()
def nuke_pid(pid, signal_queue=(signal.SIGTERM, signal.SIGKILL)):
# the process has not terminated within timeout,
# kill it via an escalating series of signals.
pid_path = '/proc/%d/'
if not os.path.exists(pid_path % pid):
# Assume that if the pid does not exist in proc it is already dead.
logging.error('No listing in /proc for pid:%d.', pid)
raise error.AutoservPidAlreadyDeadError('Could not kill nonexistant '
'pid: %s.', pid)
for sig in signal_queue:
if signal_pid(pid, sig):
return
# no signal successfully terminated the process
raise error.AutoservRunError('Could not kill %d for process name: %s' % (
pid, get_process_name(pid)), None)
def system(command, timeout=None, ignore_status=False):
"""
Run a command
@param timeout: timeout in seconds
@param ignore_status: if ignore_status=False, throw an exception if the
command's exit code is non-zero
if ignore_stauts=True, return the exit code.
@return exit status of command
(note, this will always be zero unless ignore_status=True)
"""
return run(command, timeout=timeout, ignore_status=ignore_status,
stdout_tee=TEE_TO_LOGS, stderr_tee=TEE_TO_LOGS).exit_status
def system_parallel(commands, timeout=None, ignore_status=False):
"""This function returns a list of exit statuses for the respective
list of commands."""
return [bg_jobs.exit_status for bg_jobs in
run_parallel(commands, timeout=timeout, ignore_status=ignore_status,
stdout_tee=TEE_TO_LOGS, stderr_tee=TEE_TO_LOGS)]
def system_output(command, timeout=None, ignore_status=False,
retain_output=False, args=()):
"""
Run a command and return the stdout output.
@param command: command string to execute.
@param timeout: time limit in seconds before attempting to kill the
running process. The function will take a few seconds longer
than 'timeout' to complete if it has to kill the process.
@param ignore_status: do not raise an exception, no matter what the exit
code of the command is.
@param retain_output: set to True to make stdout/stderr of the command
output to be also sent to the logging system
@param args: sequence of strings of arguments to be given to the command
inside " quotes after they have been escaped for that; each
element in the sequence will be given as a separate command
argument
@return a string with the stdout output of the command.
"""
if retain_output:
out = run(command, timeout=timeout, ignore_status=ignore_status,
stdout_tee=TEE_TO_LOGS, stderr_tee=TEE_TO_LOGS,
args=args).stdout
else:
out = run(command, timeout=timeout, ignore_status=ignore_status,
args=args).stdout
if out[-1:] == '\n':
out = out[:-1]
return out
def system_output_parallel(commands, timeout=None, ignore_status=False,
retain_output=False):
if retain_output:
out = [bg_job.stdout for bg_job
in run_parallel(commands, timeout=timeout,
ignore_status=ignore_status,
stdout_tee=TEE_TO_LOGS, stderr_tee=TEE_TO_LOGS)]
else:
out = [bg_job.stdout for bg_job in run_parallel(commands,
timeout=timeout, ignore_status=ignore_status)]
for _ in out:
if out[-1:] == '\n':
out = out[:-1]
return out
def strip_unicode(input_obj):
if type(input_obj) == list:
return [strip_unicode(i) for i in input_obj]
elif type(input_obj) == dict:
output = {}
for key in input_obj.keys():
output[str(key)] = strip_unicode(input_obj[key])
return output
elif type(input_obj) == unicode:
return str(input_obj)
else:
return input_obj
def get_cpu_percentage(function, *args, **dargs):
"""Returns a tuple containing the CPU% and return value from function call.
This function calculates the usage time by taking the difference of
the user and system times both before and after the function call.
"""
child_pre = resource.getrusage(resource.RUSAGE_CHILDREN)
self_pre = resource.getrusage(resource.RUSAGE_SELF)
start = time.time()
to_return = function(*args, **dargs)
elapsed = time.time() - start
self_post = resource.getrusage(resource.RUSAGE_SELF)
child_post = resource.getrusage(resource.RUSAGE_CHILDREN)
# Calculate CPU Percentage
s_user, s_system = [a - b for a, b in zip(self_post, self_pre)[:2]]
c_user, c_system = [a - b for a, b in zip(child_post, child_pre)[:2]]
cpu_percent = (s_user + c_user + s_system + c_system) / elapsed
return cpu_percent, to_return
def get_arch(run_function=run):
"""
Get the hardware architecture of the machine.
If specified, run_function should return a CmdResult object and throw a
CmdError exception.
If run_function is anything other than utils.run(), it is used to
execute the commands. By default (when set to utils.run()) this will
just examine os.uname()[4].
"""
# Short circuit from the common case.
if run_function == run:
return re.sub(r'i\d86$', 'i386', os.uname()[4])
# Otherwise, use the run_function in case it hits a remote machine.
arch = run_function('/bin/uname -m').stdout.rstrip()
if re.match(r'i\d86$', arch):
arch = 'i386'
return arch
def get_arch_userspace(run_function=run):
"""
Get the architecture by userspace (possibly different from kernel).
"""
archs = {
'arm': 'ELF 32-bit.*, ARM,',
'arm64': 'ELF 64-bit.*, ARM aarch64,',
'i386': 'ELF 32-bit.*, Intel 80386,',
'x86_64': 'ELF 64-bit.*, x86-64,',
}
cmd = 'file --brief --dereference /bin/sh'
filestr = run_function(cmd).stdout.rstrip()
for a, regex in archs.iteritems():
if re.match(regex, filestr):
return a
return get_arch()
def get_num_logical_cpus_per_socket(run_function=run):
"""
Get the number of cores (including hyperthreading) per cpu.
run_function is used to execute the commands. It defaults to
utils.run() but a custom method (if provided) should be of the
same schema as utils.run. It should return a CmdResult object and
throw a CmdError exception.
"""
siblings = run_function('grep "^siblings" /proc/cpuinfo').stdout.rstrip()
num_siblings = [int(x) for x in
re.findall(r'^siblings\s*:\s*(\d+)\s*$', siblings, re.M)]
if len(num_siblings) == 0:
raise error.TestError('Unable to find siblings info in /proc/cpuinfo')
if min(num_siblings) != max(num_siblings):
raise error.TestError('Number of siblings differ %r' %
num_siblings)
return num_siblings[0]
def set_high_performance_mode(host=None):
"""
Sets the kernel governor mode to the highest setting.
Returns previous governor state.
"""
original_governors = get_scaling_governor_states(host)
set_scaling_governors('performance', host)
return original_governors
def set_scaling_governors(value, host=None):
"""
Sets all scaling governor to string value.
Sample values: 'performance', 'interactive', 'ondemand', 'powersave'.
"""
paths = _get_cpufreq_paths('scaling_governor', host)
if not paths:
logging.info("Could not set governor states, as no files of the form "
"'/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor' "
"were found.")
run_func = host.run if host else system
for path in paths:
cmd = 'echo %s > %s' % (value, path)
logging.info('Writing scaling governor mode \'%s\' -> %s', value, path)
# On Tegra CPUs can be dynamically enabled/disabled. Ignore failures.
run_func(cmd, ignore_status=True)
def _get_cpufreq_paths(filename, host=None):
"""
Returns a list of paths to the governors.
"""
run_func = host.run if host else run
glob = '/sys/devices/system/cpu/cpu*/cpufreq/' + filename
# Simple glob expansion; note that CPUs may come and go, causing these
# paths to change at any time.
cmd = 'echo ' + glob
try:
paths = run_func(cmd, verbose=False).stdout.split()
except error.CmdError:
return []
# If the glob result equals itself, then we likely didn't match any real
# paths (assuming 'cpu*' is not a real path).
if paths == [glob]:
return []
return paths
def get_scaling_governor_states(host=None):
"""
Returns a list of (performance governor path, current state) tuples.
"""
paths = _get_cpufreq_paths('scaling_governor', host)
path_value_list = []
run_func = host.run if host else run
for path in paths:
value = run_func('head -n 1 %s' % path, verbose=False).stdout
path_value_list.append((path, value))
return path_value_list
def restore_scaling_governor_states(path_value_list, host=None):
"""
Restores governor states. Inverse operation to get_scaling_governor_states.
"""
run_func = host.run if host else system
for (path, value) in path_value_list:
cmd = 'echo %s > %s' % (value.rstrip('\n'), path)
# On Tegra CPUs can be dynamically enabled/disabled. Ignore failures.
run_func(cmd, ignore_status=True)
def merge_trees(src, dest):
"""
Merges a source directory tree at 'src' into a destination tree at
'dest'. If a path is a file in both trees than the file in the source
tree is APPENDED to the one in the destination tree. If a path is
a directory in both trees then the directories are recursively merged
with this function. In any other case, the function will skip the
paths that cannot be merged (instead of failing).
"""
if not os.path.exists(src):
return # exists only in dest
elif not os.path.exists(dest):
if os.path.isfile(src):
shutil.copy2(src, dest) # file only in src
else:
shutil.copytree(src, dest, symlinks=True) # dir only in src
return
elif os.path.isfile(src) and os.path.isfile(dest):
# src & dest are files in both trees, append src to dest
destfile = open(dest, "a")
try:
srcfile = open(src)
try:
destfile.write(srcfile.read())
finally:
srcfile.close()
finally:
destfile.close()
elif os.path.isdir(src) and os.path.isdir(dest):
# src & dest are directories in both trees, so recursively merge
for name in os.listdir(src):
merge_trees(os.path.join(src, name), os.path.join(dest, name))
else:
# src & dest both exist, but are incompatible
return
class CmdResult(object):
"""
Command execution result.
command: String containing the command line itself
exit_status: Integer exit code of the process
stdout: String containing stdout of the process
stderr: String containing stderr of the process
duration: Elapsed wall clock time running the process
"""
def __init__(self, command="", stdout="", stderr="",
exit_status=None, duration=0):
self.command = command
self.exit_status = exit_status
self.stdout = stdout
self.stderr = stderr
self.duration = duration
def __eq__(self, other):
if type(self) == type(other):
return (self.command == other.command
and self.exit_status == other.exit_status
and self.stdout == other.stdout
and self.stderr == other.stderr
and self.duration == other.duration)
else:
return NotImplemented
def __repr__(self):
wrapper = textwrap.TextWrapper(width = 78,
initial_indent="\n ",
subsequent_indent=" ")
stdout = self.stdout.rstrip()
if stdout:
stdout = "\nstdout:\n%s" % stdout
stderr = self.stderr.rstrip()
if stderr:
stderr = "\nstderr:\n%s" % stderr
return ("* Command: %s\n"
"Exit status: %s\n"
"Duration: %s\n"
"%s"
"%s"
% (wrapper.fill(str(self.command)), self.exit_status,
self.duration, stdout, stderr))
class run_randomly:
def __init__(self, run_sequentially=False):
# Run sequentially is for debugging control files
self.test_list = []
self.run_sequentially = run_sequentially
def add(self, *args, **dargs):
test = (args, dargs)
self.test_list.append(test)
def run(self, fn):
while self.test_list:
test_index = random.randint(0, len(self.test_list)-1)
if self.run_sequentially:
test_index = 0
(args, dargs) = self.test_list.pop(test_index)
fn(*args, **dargs)
def import_site_module(path, module, dummy=None, modulefile=None):
"""
Try to import the site specific module if it exists.
@param path full filename of the source file calling this (ie __file__)
@param module full module name
@param dummy dummy value to return in case there is no symbol to import
@param modulefile module filename
@return site specific module or dummy
@raises ImportError if the site file exists but imports fails
"""
short_module = module[module.rfind(".") + 1:]
if not modulefile:
modulefile = short_module + ".py"
if os.path.exists(os.path.join(os.path.dirname(path), modulefile)):
return __import__(module, {}, {}, [short_module])
return dummy
def import_site_symbol(path, module, name, dummy=None, modulefile=None):
"""
Try to import site specific symbol from site specific file if it exists
@param path full filename of the source file calling this (ie __file__)
@param module full module name
@param name symbol name to be imported from the site file
@param dummy dummy value to return in case there is no symbol to import
@param modulefile module filename
@return site specific symbol or dummy
@raises ImportError if the site file exists but imports fails
"""
module = import_site_module(path, module, modulefile=modulefile)
if not module:
return dummy
# special unique value to tell us if the symbol can't be imported
cant_import = object()
obj = getattr(module, name, cant_import)
if obj is cant_import:
return dummy
return obj
def import_site_class(path, module, classname, baseclass, modulefile=None):
"""
Try to import site specific class from site specific file if it exists
Args:
path: full filename of the source file calling this (ie __file__)
module: full module name
classname: class name to be loaded from site file
baseclass: base class object to return when no site file present or
to mixin when site class exists but is not inherited from baseclass
modulefile: module filename
Returns: baseclass if site specific class does not exist, the site specific
class if it exists and is inherited from baseclass or a mixin of the
site specific class and baseclass when the site specific class exists
and is not inherited from baseclass
Raises: ImportError if the site file exists but imports fails
"""
res = import_site_symbol(path, module, classname, None, modulefile)
if res:
if not issubclass(res, baseclass):
# if not a subclass of baseclass then mix in baseclass with the
# site specific class object and return the result
res = type(classname, (res, baseclass), {})
else:
res = baseclass
return res
def import_site_function(path, module, funcname, dummy, modulefile=None):
"""
Try to import site specific function from site specific file if it exists
Args:
path: full filename of the source file calling this (ie __file__)
module: full module name
funcname: function name to be imported from site file
dummy: dummy function to return in case there is no function to import
modulefile: module filename
Returns: site specific function object or dummy
Raises: ImportError if the site file exists but imports fails
"""
return import_site_symbol(path, module, funcname, dummy, modulefile)
def _get_pid_path(program_name):
my_path = os.path.dirname(__file__)
return os.path.abspath(os.path.join(my_path, "..", "..",
"%s.pid" % program_name))
def write_pid(program_name):
"""
Try to drop <program_name>.pid in the main autotest directory.
Args:
program_name: prefix for file name
"""
pidfile = open(_get_pid_path(program_name), "w")
try:
pidfile.write("%s\n" % os.getpid())
finally:
pidfile.close()
def delete_pid_file_if_exists(program_name):
"""
Tries to remove <program_name>.pid from the main autotest directory.
"""
pidfile_path = _get_pid_path(program_name)
try:
os.remove(pidfile_path)
except OSError:
if not os.path.exists(pidfile_path):
return
raise
def get_pid_from_file(program_name):
"""
Reads the pid from <program_name>.pid in the autotest directory.
@param program_name the name of the program
@return the pid if the file exists, None otherwise.
"""
pidfile_path = _get_pid_path(program_name)
if not os.path.exists(pidfile_path):
return None
pidfile = open(_get_pid_path(program_name), 'r')
try:
try:
pid = int(pidfile.readline())
except IOError:
if not os.path.exists(pidfile_path):
return None
raise
finally:
pidfile.close()
return pid
def get_process_name(pid):
"""
Get process name from PID.
@param pid: PID of process.
@return: Process name if PID stat file exists or 'Dead PID' if it does not.
"""
pid_stat_path = "/proc/%d/stat"
if not os.path.exists(pid_stat_path % pid):
return "Dead Pid"
return get_field(read_file(pid_stat_path % pid), 1)[1:-1]
def program_is_alive(program_name):
"""
Checks if the process is alive and not in Zombie state.
@param program_name the name of the program
@return True if still alive, False otherwise
"""
pid = get_pid_from_file(program_name)
if pid is None:
return False
return pid_is_alive(pid)
def signal_program(program_name, sig=signal.SIGTERM):
"""
Sends a signal to the process listed in <program_name>.pid
@param program_name the name of the program
@param sig signal to send
"""
pid = get_pid_from_file(program_name)
if pid:
signal_pid(pid, sig)
def get_relative_path(path, reference):
"""Given 2 absolute paths "path" and "reference", compute the path of
"path" as relative to the directory "reference".
@param path the absolute path to convert to a relative path
@param reference an absolute directory path to which the relative
path will be computed
"""
# normalize the paths (remove double slashes, etc)
assert(os.path.isabs(path))
assert(os.path.isabs(reference))
path = os.path.normpath(path)
reference = os.path.normpath(reference)
# we could use os.path.split() but it splits from the end
path_list = path.split(os.path.sep)[1:]
ref_list = reference.split(os.path.sep)[1:]
# find the longest leading common path
for i in xrange(min(len(path_list), len(ref_list))):
if path_list[i] != ref_list[i]:
# decrement i so when exiting this loop either by no match or by
# end of range we are one step behind
i -= 1
break
i += 1
# drop the common part of the paths, not interested in that anymore
del path_list[:i]
# for each uncommon component in the reference prepend a ".."
path_list[:0] = ['..'] * (len(ref_list) - i)
return os.path.join(*path_list)
def sh_escape(command):
"""
Escape special characters from a command so that it can be passed
as a double quoted (" ") string in a (ba)sh command.
Args:
command: the command string to escape.
Returns:
The escaped command string. The required englobing double
quotes are NOT added and so should be added at some point by
the caller.
See also: http://www.tldp.org/LDP/abs/html/escapingsection.html
"""
command = command.replace("\\", "\\\\")
command = command.replace("$", r'\$')
command = command.replace('"', r'\"')
command = command.replace('`', r'\`')
return command
def sh_quote_word(text, whitelist=SHELL_QUOTING_WHITELIST):
r"""Quote a string to make it safe as a single word in a shell command.
POSIX shell syntax recognizes no escape characters inside a single-quoted
string. So, single quotes can safely quote any string of characters except
a string with a single quote character. A single quote character must be
quoted with the sequence '\'' which translates to:
' -> close current quote
\' -> insert a literal single quote
' -> reopen quoting again.
This is safe for all combinations of characters, including embedded and
trailing backslashes in odd or even numbers.
This is also safe for nesting, e.g. the following is a valid use:
adb_command = 'adb shell %s' % (
sh_quote_word('echo %s' % sh_quote_word('hello world')))
@param text: The string to be quoted into a single word for the shell.
@param whitelist: Optional list of characters that do not need quoting.
Defaults to a known good list of characters.
@return A string, possibly quoted, safe as a single word for a shell.
"""
if all(c in whitelist for c in text):
return text
return "'" + text.replace("'", r"'\''") + "'"
def configure(extra=None, configure='./configure'):
"""
Run configure passing in the correct host, build, and target options.
@param extra: extra command line arguments to pass to configure
@param configure: which configure script to use
"""
args = []
if 'CHOST' in os.environ:
args.append('--host=' + os.environ['CHOST'])
if 'CBUILD' in os.environ:
args.append('--build=' + os.environ['CBUILD'])
if 'CTARGET' in os.environ:
args.append('--target=' + os.environ['CTARGET'])
if extra:
args.append(extra)
system('%s %s' % (configure, ' '.join(args)))
def make(extra='', make='make', timeout=None, ignore_status=False):
"""
Run make, adding MAKEOPTS to the list of options.
@param extra: extra command line arguments to pass to make.
"""
cmd = '%s %s %s' % (make, os.environ.get('MAKEOPTS', ''), extra)
return system(cmd, timeout=timeout, ignore_status=ignore_status)
def compare_versions(ver1, ver2):
"""Version number comparison between ver1 and ver2 strings.
>>> compare_tuple("1", "2")
-1
>>> compare_tuple("foo-1.1", "foo-1.2")
-1
>>> compare_tuple("1.2", "1.2a")
-1
>>> compare_tuple("1.2b", "1.2a")
1
>>> compare_tuple("1.3.5.3a", "1.3.5.3b")
-1
Args:
ver1: version string
ver2: version string
Returns:
int: 1 if ver1 > ver2
0 if ver1 == ver2
-1 if ver1 < ver2
"""
ax = re.split('[.-]', ver1)
ay = re.split('[.-]', ver2)
while len(ax) > 0 and len(ay) > 0:
cx = ax.pop(0)
cy = ay.pop(0)
maxlen = max(len(cx), len(cy))
c = cmp(cx.zfill(maxlen), cy.zfill(maxlen))
if c != 0:
return c
return cmp(len(ax), len(ay))
def args_to_dict(args):
"""Convert autoserv extra arguments in the form of key=val or key:val to a
dictionary. Each argument key is converted to lowercase dictionary key.
Args:
args - list of autoserv extra arguments.
Returns:
dictionary
"""
arg_re = re.compile(r'(\w+)[:=](.*)$')
args_dict = {}
for arg in args:
match = arg_re.match(arg)
if match:
args_dict[match.group(1).lower()] = match.group(2)
else:
logging.warning("args_to_dict: argument '%s' doesn't match "
"'%s' pattern. Ignored.", arg, arg_re.pattern)
return args_dict
def get_unused_port():
"""
Finds a semi-random available port. A race condition is still
possible after the port number is returned, if another process
happens to bind it.
Returns:
A port number that is unused on both TCP and UDP.
"""
def try_bind(port, socket_type, socket_proto):
s = socket.socket(socket.AF_INET, socket_type, socket_proto)
try:
try:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(('', port))
return s.getsockname()[1]
except socket.error:
return None
finally:
s.close()
# On the 2.6 kernel, calling try_bind() on UDP socket returns the
# same port over and over. So always try TCP first.
while True:
# Ask the OS for an unused port.
port = try_bind(0, socket.SOCK_STREAM, socket.IPPROTO_TCP)
# Check if this port is unused on the other protocol.
if port and try_bind(port, socket.SOCK_DGRAM, socket.IPPROTO_UDP):
return port
def ask(question, auto=False):
"""
Raw input with a prompt that emulates logging.
@param question: Question to be asked
@param auto: Whether to return "y" instead of asking the question
"""
if auto:
logging.info("%s (y/n) y", question)
return "y"
return raw_input("%s INFO | %s (y/n) " %
(time.strftime("%H:%M:%S", time.localtime()), question))
def rdmsr(address, cpu=0):
"""
Reads an x86 MSR from the specified CPU, returns as long integer.
"""
with open('/dev/cpu/%s/msr' % cpu, 'r', 0) as fd:
fd.seek(address)
return struct.unpack('=Q', fd.read(8))[0]
def wait_for_value(func,
expected_value=None,
min_threshold=None,
max_threshold=None,
timeout_sec=10):
"""
Returns the value of func(). If |expected_value|, |min_threshold|, and
|max_threshold| are not set, returns immediately.
If |expected_value| is set, polls the return value until |expected_value| is
reached, and returns that value.
If either |max_threshold| or |min_threshold| is set, this function will
will repeatedly call func() until the return value reaches or exceeds one of
these thresholds.
Polling will stop after |timeout_sec| regardless of these thresholds.
@param func: function whose return value is to be waited on.
@param expected_value: wait for func to return this value.
@param min_threshold: wait for func value to reach or fall below this value.
@param max_threshold: wait for func value to reach or rise above this value.
@param timeout_sec: Number of seconds to wait before giving up and
returning whatever value func() last returned.
Return value:
The most recent return value of func().
"""
value = None
start_time_sec = time.time()
while True:
value = func()
if (expected_value is None and \
min_threshold is None and \
max_threshold is None) or \
(expected_value is not None and value == expected_value) or \
(min_threshold is not None and value <= min_threshold) or \
(max_threshold is not None and value >= max_threshold):
break
if time.time() - start_time_sec >= timeout_sec:
break
time.sleep(0.1)
return value
def wait_for_value_changed(func,
old_value=None,
timeout_sec=10):
"""
Returns the value of func().
The function polls the return value until it is different from |old_value|,
and returns that value.
Polling will stop after |timeout_sec|.
@param func: function whose return value is to be waited on.
@param old_value: wait for func to return a value different from this.
@param timeout_sec: Number of seconds to wait before giving up and
returning whatever value func() last returned.
@returns The most recent return value of func().
"""
value = None
start_time_sec = time.time()
while True:
value = func()
if value != old_value:
break
if time.time() - start_time_sec >= timeout_sec:
break
time.sleep(0.1)
return value
CONFIG = global_config.global_config
# Keep checking if the pid is alive every second until the timeout (in seconds)
CHECK_PID_IS_ALIVE_TIMEOUT = 6
_LOCAL_HOST_LIST = ('localhost', '127.0.0.1')
# The default address of a vm gateway.
DEFAULT_VM_GATEWAY = '10.0.2.2'
# Google Storage bucket URI to store results in.
DEFAULT_OFFLOAD_GSURI = CONFIG.get_config_value(
'CROS', 'results_storage_server', default=None)
# Default Moblab Ethernet Interface.
_MOBLAB_ETH_0 = 'eth0'
_MOBLAB_ETH_1 = 'eth1'
# A list of subnets that requires dedicated devserver and drone in the same
# subnet. Each item is a tuple of (subnet_ip, mask_bits), e.g.,
# ('192.168.0.0', 24))
RESTRICTED_SUBNETS = []
def _setup_restricted_subnets():
restricted_subnets_list = CONFIG.get_config_value(
'CROS', 'restricted_subnets', type=list, default=[])
# TODO(dshi): Remove the code to split subnet with `:` after R51 is
# off stable channel, and update shadow config to use `/` as
# delimiter for consistency.
for subnet in restricted_subnets_list:
ip, mask_bits = subnet.split('/') if '/' in subnet \
else subnet.split(':')
RESTRICTED_SUBNETS.append((ip, int(mask_bits)))
_setup_restricted_subnets()
# regex pattern for CLIENT/wireless_ssid_ config. For example, global config
# can have following config in CLIENT section to indicate that hosts in subnet
# 192.168.0.1/24 should use wireless ssid of `ssid_1`
# wireless_ssid_192.168.0.1/24: ssid_1
WIRELESS_SSID_PATTERN = 'wireless_ssid_(.*)/(\d+)'
def get_moblab_serial_number():
"""Gets a unique identifier for the moblab.
Serial number is the prefered identifier, use it if
present, however fallback is the ethernet mac address.
"""
for vpd_key in ['serial_number', 'ethernet_mac']:
try:
cmd_result = run('sudo vpd -g %s' % vpd_key)
if cmd_result and cmd_result.stdout:
return cmd_result.stdout
except error.CmdError as e:
logging.error(str(e))
logging.info(vpd_key)
return 'NoSerialNumber'
def ping(host, deadline=None, tries=None, timeout=60, user=None):
"""Attempt to ping |host|.
Shell out to 'ping' if host is an IPv4 addres or 'ping6' if host is an
IPv6 address to try to reach |host| for |timeout| seconds.
Returns exit code of ping.
Per 'man ping', if you specify BOTH |deadline| and |tries|, ping only
returns 0 if we get responses to |tries| pings within |deadline| seconds.
Specifying |deadline| or |count| alone should return 0 as long as
some packets receive responses.
Note that while this works with literal IPv6 addresses it will not work
with hostnames that resolve to IPv6 only.
@param host: the host to ping.
@param deadline: seconds within which |tries| pings must succeed.
@param tries: number of pings to send.
@param timeout: number of seconds after which to kill 'ping' command.
@return exit code of ping command.
"""
args = [host]
cmd = 'ping6' if re.search(r':.*:', host) else 'ping'
if deadline:
args.append('-w%d' % deadline)
if tries:
args.append('-c%d' % tries)
if user != None:
args = [user, '-c', ' '.join([cmd] + args)]
cmd = 'su'
return run(cmd, args=args, verbose=True,
ignore_status=True, timeout=timeout,
stdout_tee=TEE_TO_LOGS,
stderr_tee=TEE_TO_LOGS).exit_status
def host_is_in_lab_zone(hostname):
"""Check if the host is in the CLIENT.dns_zone.
@param hostname: The hostname to check.
@returns True if hostname.dns_zone resolves, otherwise False.
"""
host_parts = hostname.split('.')
dns_zone = CONFIG.get_config_value('CLIENT', 'dns_zone', default=None)
fqdn = '%s.%s' % (host_parts[0], dns_zone)
logging.debug('Checking if host %s is in lab zone.', fqdn)
try:
socket.gethostbyname(fqdn)
return True
except socket.gaierror:
return False
def in_moblab_ssp():
"""Detects if this execution is inside an SSP container on moblab."""
config_is_moblab = CONFIG.get_config_value('SSP', 'is_moblab', type=bool,
default=False)
return is_in_container() and config_is_moblab
def get_chrome_version(job_views):
"""
Retrieves the version of the chrome binary associated with a job.
When a test runs we query the chrome binary for it's version and drop
that value into a client keyval. To retrieve the chrome version we get all
the views associated with a test from the db, including those of the
server and client jobs, and parse the version out of the first test view
that has it. If we never ran a single test in the suite the job_views
dictionary will not contain a chrome version.
This method cannot retrieve the chrome version from a dictionary that
does not conform to the structure of an autotest tko view.
@param job_views: a list of a job's result views, as returned by
the get_detailed_test_views method in rpc_interface.
@return: The chrome version string, or None if one can't be found.
"""
# Aborted jobs have no views.
if not job_views:
return None
for view in job_views:
if (view.get('attributes')
and constants.CHROME_VERSION in view['attributes'].keys()):
return view['attributes'].get(constants.CHROME_VERSION)
logging.warning('Could not find chrome version for failure.')
return None
def get_moblab_id():
"""Gets the moblab random id.
The random id file is cached on disk. If it does not exist, a new file is
created the first time.
@returns the moblab random id.
"""
moblab_id_filepath = '/home/moblab/.moblab_id'
try:
if os.path.exists(moblab_id_filepath):
with open(moblab_id_filepath, 'r') as moblab_id_file:
random_id = moblab_id_file.read()
else:
random_id = uuid.uuid1().hex
with open(moblab_id_filepath, 'w') as moblab_id_file:
moblab_id_file.write('%s' % random_id)
except IOError as e:
# Possible race condition, another process has created the file.
# Sleep a second to make sure the file gets closed.
logging.info(e)
time.sleep(1)
with open(moblab_id_filepath, 'r') as moblab_id_file:
random_id = moblab_id_file.read()
return random_id
def get_offload_gsuri():
"""Return the GSURI to offload test results to.
For the normal use case this is the results_storage_server in the
global_config.
However partners using Moblab will be offloading their results to a
subdirectory of their image storage buckets. The subdirectory is
determined by the MAC Address of the Moblab device.
@returns gsuri to offload test results to.
"""
# For non-moblab, use results_storage_server or default.
if not is_moblab(): # pylint: disable=undefined-variable
return DEFAULT_OFFLOAD_GSURI
# For moblab, use results_storage_server or image_storage_server as bucket
# name and mac-address/moblab_id as path.
gsuri = DEFAULT_OFFLOAD_GSURI
if not gsuri:
gsuri = "%sresults/" % CONFIG.get_config_value('CROS',
'image_storage_server')
return '%s%s/%s/' % (gsuri, get_moblab_serial_number(), get_moblab_id())
# TODO(petermayo): crosbug.com/31826 Share this with _GsUpload in
# //chromite.git/buildbot/prebuilt.py somewhere/somehow
def gs_upload(local_file, remote_file, acl, result_dir=None,
transfer_timeout=300, acl_timeout=300):
"""Upload to GS bucket.
@param local_file: Local file to upload
@param remote_file: Remote location to upload the local_file to.
@param acl: name or file used for controlling access to the uploaded
file.
@param result_dir: Result directory if you want to add tracing to the
upload.
@param transfer_timeout: Timeout for this upload call.
@param acl_timeout: Timeout for the acl call needed to confirm that
the uploader has permissions to execute the upload.
@raise CmdError: the exit code of the gsutil call was not 0.
@returns True/False - depending on if the upload succeeded or failed.
"""
# https://developers.google.com/storage/docs/accesscontrol#extension
CANNED_ACLS = ['project-private', 'private', 'public-read',
'public-read-write', 'authenticated-read',
'bucket-owner-read', 'bucket-owner-full-control']
_GSUTIL_BIN = 'gsutil'
acl_cmd = None
if acl in CANNED_ACLS:
cmd = '%s cp -a %s %s %s' % (_GSUTIL_BIN, acl, local_file, remote_file)
else:
# For private uploads we assume that the overlay board is set up
# properly and a googlestore_acl.xml is present, if not this script
# errors
cmd = '%s cp -a private %s %s' % (_GSUTIL_BIN, local_file, remote_file)
if not os.path.exists(acl):
logging.error('Unable to find ACL File %s.', acl)
return False
acl_cmd = '%s setacl %s %s' % (_GSUTIL_BIN, acl, remote_file)
if not result_dir:
run(cmd, timeout=transfer_timeout, verbose=True)
if acl_cmd:
run(acl_cmd, timeout=acl_timeout, verbose=True)
return True
with open(os.path.join(result_dir, 'tracing'), 'w') as ftrace:
ftrace.write('Preamble\n')
run(cmd, timeout=transfer_timeout, verbose=True,
stdout_tee=ftrace, stderr_tee=ftrace)
if acl_cmd:
ftrace.write('\nACL setting\n')
# Apply the passed in ACL xml file to the uploaded object.
run(acl_cmd, timeout=acl_timeout, verbose=True,
stdout_tee=ftrace, stderr_tee=ftrace)
ftrace.write('Postamble\n')
return True
def gs_ls(uri_pattern):
"""Returns a list of URIs that match a given pattern.
@param uri_pattern: a GS URI pattern, may contain wildcards
@return A list of URIs matching the given pattern.
@raise CmdError: the gsutil command failed.
"""
gs_cmd = ' '.join(['gsutil', 'ls', uri_pattern])
result = system_output(gs_cmd).splitlines()
return [path.rstrip() for path in result if path]
def nuke_pids(pid_list, signal_queue=None):
"""
Given a list of pid's, kill them via an esclating series of signals.
@param pid_list: List of PID's to kill.
@param signal_queue: Queue of signals to send the PID's to terminate them.
@return: A mapping of the signal name to the number of processes it
was sent to.
"""
if signal_queue is None:
signal_queue = [signal.SIGTERM, signal.SIGKILL]
sig_count = {}
# Though this is slightly hacky it beats hardcoding names anyday.
sig_names = dict((k, v) for v, k in signal.__dict__.iteritems()
if v.startswith('SIG'))
for sig in signal_queue:
logging.debug('Sending signal %s to the following pids:', sig)
sig_count[sig_names.get(sig, 'unknown_signal')] = len(pid_list)
for pid in pid_list:
logging.debug('Pid %d', pid)
try:
os.kill(pid, sig)
except OSError:
# The process may have died from a previous signal before we
# could kill it.
pass
if sig == signal.SIGKILL:
return sig_count
pid_list = [pid for pid in pid_list if pid_is_alive(pid)]
if not pid_list:
break
time.sleep(CHECK_PID_IS_ALIVE_TIMEOUT)
failed_list = []
for pid in pid_list:
if pid_is_alive(pid):
failed_list.append('Could not kill %d for process name: %s.' % pid,
get_process_name(pid))
if failed_list:
raise error.AutoservRunError('Following errors occured: %s' %
failed_list, None)
return sig_count
def externalize_host(host):
"""Returns an externally accessible host name.
@param host: a host name or address (string)
@return An externally visible host name or address
"""
return socket.gethostname() if host in _LOCAL_HOST_LIST else host
def urlopen_socket_timeout(url, data=None, timeout=5):
"""
Wrapper to urllib2.urlopen with a socket timeout.
This method will convert all socket timeouts to
TimeoutExceptions, so we can use it in conjunction
with the rpc retry decorator and continue to handle
other URLErrors as we see fit.
@param url: The url to open.
@param data: The data to send to the url (eg: the urlencoded dictionary
used with a POST call).
@param timeout: The timeout for this urlopen call.
@return: The response of the urlopen call.
@raises: error.TimeoutException when a socket timeout occurs.
urllib2.URLError for errors that not caused by timeout.
urllib2.HTTPError for errors like 404 url not found.
"""
old_timeout = socket.getdefaulttimeout()
socket.setdefaulttimeout(timeout)
try:
return urllib2.urlopen(url, data=data)
except urllib2.URLError as e:
if type(e.reason) is socket.timeout:
raise error.TimeoutException(str(e))
raise
finally:
socket.setdefaulttimeout(old_timeout)
def parse_chrome_version(version_string):
"""
Parse a chrome version string and return version and milestone.
Given a chrome version of the form "W.X.Y.Z", return "W.X.Y.Z" as
the version and "W" as the milestone.
@param version_string: Chrome version string.
@return: a tuple (chrome_version, milestone). If the incoming version
string is not of the form "W.X.Y.Z", chrome_version will
be set to the incoming "version_string" argument and the
milestone will be set to the empty string.
"""
match = re.search('(\d+)\.\d+\.\d+\.\d+', version_string)
ver = match.group(0) if match else version_string
milestone = match.group(1) if match else ''
return ver, milestone
def parse_gs_uri_version(uri):
"""Pull out major.minor.sub from image URI
@param uri: A GS URI for a bucket containing ChromeOS build artifacts
@return: The build version as a string in the form 'major.minor.sub'
"""
return re.sub('.*(R[0-9]+|LATEST)-', '', uri).strip('/')
def compare_gs_uri_build_versions(x, y):
"""Compares two bucket URIs by their version string
@param x: A GS URI for a bucket containing ChromeOS build artifacts
@param y: Another GS URI for a bucket containing ChromeOS build artifacts
@return: 1 if x > y, -1 if x < y, and 0 if x == y
"""
# Converts a gs uri 'gs://.../R75-<major>.<minor>.<sub>' to
# [major, minor, sub]
split_version = lambda v: [int(x) for x in
parse_gs_uri_version(v).split('.')]
x_version = split_version(x)
y_version = split_version(y)
for a, b in zip(x_version, y_version):
if a > b:
return 1
elif b > a:
return -1
return 0
def is_localhost(server):
"""Check if server is equivalent to localhost.
@param server: Name of the server to check.
@return: True if given server is equivalent to localhost.
@raise socket.gaierror: If server name failed to be resolved.
"""
if server in _LOCAL_HOST_LIST:
return True
try:
return (socket.gethostbyname(socket.gethostname()) ==
socket.gethostbyname(server))
except socket.gaierror:
logging.error('Failed to resolve server name %s.', server)
return False
def get_function_arg_value(func, arg_name, args, kwargs):
"""Get the value of the given argument for the function.
@param func: Function being called with given arguments.
@param arg_name: Name of the argument to look for value.
@param args: arguments for function to be called.
@param kwargs: keyword arguments for function to be called.
@return: The value of the given argument for the function.
@raise ValueError: If the argument is not listed function arguemnts.
@raise KeyError: If no value is found for the given argument.
"""
if arg_name in kwargs:
return kwargs[arg_name]
argspec = inspect.getargspec(func)
index = argspec.args.index(arg_name)
try:
return args[index]
except IndexError:
try:
# The argument can use a default value. Reverse the default value
# so argument with default value can be counted from the last to
# the first.
return argspec.defaults[::-1][len(argspec.args) - index - 1]
except IndexError:
raise KeyError('Argument %s is not given a value. argspec: %s, '
'args:%s, kwargs:%s' %
(arg_name, argspec, args, kwargs))
def has_systemd():
"""Check if the host is running systemd.
@return: True if the host uses systemd, otherwise returns False.
"""
return os.path.basename(os.readlink('/proc/1/exe')) == 'systemd'
def get_real_user():
"""Get the real user that runs the script.
The function check environment variable SUDO_USER for the user if the
script is run with sudo. Otherwise, it returns the value of environment
variable USER.
@return: The user name that runs the script.
"""
user = os.environ.get('SUDO_USER')
if not user:
user = os.environ.get('USER')
return user
def get_service_pid(service_name):
"""Return pid of service.
@param service_name: string name of service.
@return: pid or 0 if service is not running.
"""
if has_systemd():
# systemctl show prints 'MainPID=0' if the service is not running.
cmd_result = run('systemctl show -p MainPID %s' %
service_name, ignore_status=True)
return int(cmd_result.stdout.split('=')[1])
else:
cmd_result = run('status %s' % service_name,
ignore_status=True)
if 'start/running' in cmd_result.stdout:
return int(cmd_result.stdout.split()[3])
return 0
def control_service(service_name, action='start', ignore_status=True):
"""Controls a service. It can be used to start, stop or restart
a service.
@param service_name: string service to be restarted.
@param action: string choice of action to control command.
@param ignore_status: boolean ignore if system command fails.
@return: status code of the executed command.
"""
if action not in ('start', 'stop', 'restart'):
raise ValueError('Unknown action supplied as parameter.')
control_cmd = action + ' ' + service_name
if has_systemd():
control_cmd = 'systemctl ' + control_cmd
return system(control_cmd, ignore_status=ignore_status)
def restart_service(service_name, ignore_status=True):
"""Restarts a service
@param service_name: string service to be restarted.
@param ignore_status: boolean ignore if system command fails.
@return: status code of the executed command.
"""
return control_service(service_name, action='restart',
ignore_status=ignore_status)
def start_service(service_name, ignore_status=True):
"""Starts a service
@param service_name: string service to be started.
@param ignore_status: boolean ignore if system command fails.
@return: status code of the executed command.
"""
return control_service(service_name, action='start',
ignore_status=ignore_status)
def stop_service(service_name, ignore_status=True):
"""Stops a service
@param service_name: string service to be stopped.
@param ignore_status: boolean ignore if system command fails.
@return: status code of the executed command.
"""
return control_service(service_name, action='stop',
ignore_status=ignore_status)
def sudo_require_password():
"""Test if the process can run sudo command without using password.
@return: True if the process needs password to run sudo command.
"""
try:
run('sudo -n true')
return False
except error.CmdError:
logging.warn('sudo command requires password.')
return True
def is_in_container():
"""Check if the process is running inside a container.
@return: True if the process is running inside a container, otherwise False.
"""
result = run('grep -q "/lxc/" /proc/1/cgroup',
verbose=False, ignore_status=True)
if result.exit_status == 0:
return True
# Check "container" environment variable for lxd/lxc containers.
if os.environ.get('container') == 'lxc':
return True
return False
def is_flash_installed():
"""
The Adobe Flash binary is only distributed with internal builds.
"""
return (os.path.exists('/opt/google/chrome/pepper/libpepflashplayer.so')
and os.path.exists('/opt/google/chrome/pepper/pepper-flash.info'))
def verify_flash_installed():
"""
The Adobe Flash binary is only distributed with internal builds.
Warn users of public builds of the extra dependency.
"""
if not is_flash_installed():
raise error.TestNAError('No Adobe Flash binary installed.')
def is_in_same_subnet(ip_1, ip_2, mask_bits=24):
"""Check if two IP addresses are in the same subnet with given mask bits.
The two IP addresses are string of IPv4, e.g., '192.168.0.3'.
@param ip_1: First IP address to compare.
@param ip_2: Second IP address to compare.
@param mask_bits: Number of mask bits for subnet comparison. Default to 24.
@return: True if the two IP addresses are in the same subnet.
"""
mask = ((2L<<mask_bits-1) -1)<<(32-mask_bits)
ip_1_num = struct.unpack('!I', socket.inet_aton(ip_1))[0]
ip_2_num = struct.unpack('!I', socket.inet_aton(ip_2))[0]
return ip_1_num & mask == ip_2_num & mask
def get_ip_address(hostname=None):
"""Get the IP address of given hostname or current machine.
@param hostname: Hostname of a DUT, default value is None.
@return: The IP address of given hostname. If hostname is not given then
we'll try to query the IP address of the current machine and
return.
"""
if hostname:
try:
return socket.gethostbyname(hostname)
except socket.gaierror as e:
logging.error(
'Failed to get IP address of %s, error: %s.', hostname, e)
else:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("8.8.8.8", 80))
ip = s.getsockname()[0]
s.close()
return ip
def get_servers_in_same_subnet(host_ip, mask_bits, servers=None,
server_ip_map=None):
"""Get the servers in the same subnet of the given host ip.
@param host_ip: The IP address of a dut to look for devserver.
@param mask_bits: Number of mask bits.
@param servers: A list of servers to be filtered by subnet specified by
host_ip and mask_bits.
@param server_ip_map: A map between the server name and its IP address.
The map can be pre-built for better performance, e.g., when
allocating a drone for an agent task.
@return: A list of servers in the same subnet of the given host ip.
"""
matched_servers = []
if not servers and not server_ip_map:
raise ValueError('Either `servers` or `server_ip_map` must be given.')
if not servers:
servers = server_ip_map.keys()
# Make sure server_ip_map is an empty dict if it's not set.
if not server_ip_map:
server_ip_map = {}
for server in servers:
server_ip = server_ip_map.get(server, get_ip_address(server))
if server_ip and is_in_same_subnet(server_ip, host_ip, mask_bits):
matched_servers.append(server)
return matched_servers
def get_restricted_subnet(hostname, restricted_subnets=None):
"""Get the restricted subnet of given hostname.
@param hostname: Name of the host to look for matched restricted subnet.
@param restricted_subnets: A list of restricted subnets, default is set to
RESTRICTED_SUBNETS.
@return: A tuple of (subnet_ip, mask_bits), which defines a restricted
subnet.
"""
if restricted_subnets is None:
restricted_subnets=RESTRICTED_SUBNETS
host_ip = get_ip_address(hostname)
if not host_ip:
return
for subnet_ip, mask_bits in restricted_subnets:
if is_in_same_subnet(subnet_ip, host_ip, mask_bits):
return subnet_ip, mask_bits
def get_wireless_ssid(hostname):
"""Get the wireless ssid based on given hostname.
The method tries to locate the wireless ssid in the same subnet of given
hostname first. If none is found, it returns the default setting in
CLIENT/wireless_ssid.
@param hostname: Hostname of the test device.
@return: wireless ssid for the test device.
"""
default_ssid = CONFIG.get_config_value('CLIENT', 'wireless_ssid',
default=None)
host_ip = get_ip_address(hostname)
if not host_ip:
return default_ssid
# Get all wireless ssid in the global config.
ssids = CONFIG.get_config_value_regex('CLIENT', WIRELESS_SSID_PATTERN)
# There could be multiple subnet matches, pick the one with most strict
# match, i.e., the one with highest maskbit.
matched_ssid = default_ssid
matched_maskbit = -1
for key, value in ssids.items():
# The config key filtered by regex WIRELESS_SSID_PATTERN has a format of
# wireless_ssid_[subnet_ip]/[maskbit], for example:
# wireless_ssid_192.168.0.1/24
# Following line extract the subnet ip and mask bit from the key name.
match = re.match(WIRELESS_SSID_PATTERN, key)
subnet_ip, maskbit = match.groups()
maskbit = int(maskbit)
if (is_in_same_subnet(subnet_ip, host_ip, maskbit) and
maskbit > matched_maskbit):
matched_ssid = value
matched_maskbit = maskbit
return matched_ssid
def parse_launch_control_build(build_name):
"""Get branch, target, build_id from the given Launch Control build_name.
@param build_name: Name of a Launch Control build, should be formated as
branch/target/build_id
@return: Tuple of branch, target, build_id
@raise ValueError: If the build_name is not correctly formated.
"""
branch, target, build_id = build_name.split('/')
return branch, target, build_id
def parse_android_target(target):
"""Get board and build type from the given target.
@param target: Name of an Android build target, e.g., shamu-eng.
@return: Tuple of board, build_type
@raise ValueError: If the target is not correctly formated.
"""
board, build_type = target.split('-')
return board, build_type
def parse_launch_control_target(target):
"""Parse the build target and type from a Launch Control target.
The Launch Control target has the format of build_target-build_type, e.g.,
shamu-eng or dragonboard-userdebug. This method extracts the build target
and type from the target name.
@param target: Name of a Launch Control target, e.g., shamu-eng.
@return: (build_target, build_type), e.g., ('shamu', 'userdebug')
"""
match = re.match('(?P<build_target>.+)-(?P<build_type>[^-]+)', target)
if match:
return match.group('build_target'), match.group('build_type')
else:
return None, None
def is_launch_control_build(build):
"""Check if a given build is a Launch Control build.
@param build: Name of a build, e.g.,
ChromeOS build: daisy-release/R50-1234.0.0
Launch Control build: git_mnc_release/shamu-eng
@return: True if the build name matches the pattern of a Launch Control
build, False otherwise.
"""
try:
_, target, _ = parse_launch_control_build(build)
build_target, _ = parse_launch_control_target(target)
if build_target:
return True
except ValueError:
# parse_launch_control_build or parse_launch_control_target failed.
pass
return False
def which(exec_file):
"""Finds an executable file.
If the file name contains a path component, it is checked as-is.
Otherwise, we check with each of the path components found in the system
PATH prepended. This behavior is similar to the 'which' command-line tool.
@param exec_file: Name or path to desired executable.
@return: An actual path to the executable, or None if not found.
"""
if os.path.dirname(exec_file):
return exec_file if os.access(exec_file, os.X_OK) else None
sys_path = os.environ.get('PATH')
prefix_list = sys_path.split(os.pathsep) if sys_path else []
for prefix in prefix_list:
path = os.path.join(prefix, exec_file)
if os.access(path, os.X_OK):
return path
class TimeoutError(error.TestError):
"""Error raised when poll_for_condition() failed to poll within time.
It may embed a reason (either a string or an exception object) so that
the caller of poll_for_condition() can handle failure better.
"""
def __init__(self, message=None, reason=None):
"""Constructor.
It supports three invocations:
1) TimeoutError()
2) TimeoutError(message): with customized message.
3) TimeoutError(message, reason): with message and reason for timeout.
"""
self.reason = reason
if self.reason:
reason_str = 'Reason: ' + repr(self.reason)
if message:
message += '. ' + reason_str
else:
message = reason_str
if message:
super(TimeoutError, self).__init__(message)
else:
super(TimeoutError, self).__init__()
class Timer(object):
"""A synchronous timer to evaluate if timout is reached.
Usage:
timer = Timer(timeout_sec)
while timer.sleep(sleep_interval):
# do something...
"""
def __init__(self, timeout):
"""Constructor.
Note that timer won't start until next() is called.
@param timeout: timer timeout in seconds.
"""
self.timeout = timeout
self.deadline = 0
def sleep(self, interval):
"""Checks if it has sufficient time to sleep; sleeps if so.
It blocks for |interval| seconds if it has time to sleep.
If timer is not ticked yet, kicks it off and returns True without
sleep.
@param interval: sleep interval in seconds.
@return True if it has sleeped or just kicked off the timer. False
otherwise.
"""
now = time.time()
if not self.deadline:
self.deadline = now + self.timeout
return True
if now + interval < self.deadline:
time.sleep(interval)
return True
return False
def poll_for_condition(condition,
exception=None,
timeout=10,
sleep_interval=0.1,
desc=None):
"""Polls until a condition is evaluated to true.
@param condition: function taking no args and returning anything that will
evaluate to True in a conditional check
@param exception: exception to throw if condition doesn't evaluate to true
@param timeout: maximum number of seconds to wait
@param sleep_interval: time to sleep between polls
@param desc: description of default TimeoutError used if 'exception' is
None
@return The evaluated value that caused the poll loop to terminate.
@raise 'exception' arg if supplied; TimeoutError otherwise
"""
start_time = time.time()
while True:
value = condition()
if value:
return value
if time.time() + sleep_interval - start_time > timeout:
if exception:
logging.error('Will raise error %r due to unexpected return: '
'%r', exception, value)
raise exception # pylint: disable=raising-bad-type
if desc:
desc = 'Timed out waiting for condition: ' + desc
else:
desc = 'Timed out waiting for unnamed condition'
logging.error(desc)
raise TimeoutError(message=desc)
time.sleep(sleep_interval)
def poll_for_condition_ex(condition, timeout=10, sleep_interval=0.1, desc=None):
"""Polls until a condition is evaluated to true or until timeout.
Similiar to poll_for_condition, except that it handles exceptions
condition() raises. If timeout is not reached, the exception is dropped and
poll for condition after a sleep; otherwise, the exception is embedded into
TimeoutError to raise.
@param condition: function taking no args and returning anything that will
evaluate to True in a conditional check
@param timeout: maximum number of seconds to wait
@param sleep_interval: time to sleep between polls
@param desc: description of the condition
@return The evaluated value that caused the poll loop to terminate.
@raise TimeoutError. If condition() raised exception, it is embedded in
raised TimeoutError.
"""
timer = Timer(timeout)
while timer.sleep(sleep_interval):
reason = None
try:
value = condition()
if value:
return value
except BaseException as e:
reason = e
if desc is None:
desc = 'unamed condition'
if reason is None:
reason = 'condition evaluted as false'
to_raise = TimeoutError(message='Timed out waiting for ' + desc,
reason=reason)
logging.error(str(to_raise))
raise to_raise
def shadowroot_query(element, action):
"""Recursively queries shadowRoot.
@param element: element to query for.
@param action: action to be performed on the element.
@return JS functions to execute.
"""
# /deep/ CSS query has been removed from ShadowDOM. The only way to access
# elements now is to recursively query in each shadowRoot.
shadowroot_script = """
function deepQuerySelectorAll(root, targetQuery) {
const elems = Array.prototype.slice.call(
root.querySelectorAll(targetQuery[0]));
const remaining = targetQuery.slice(1);
if (remaining.length === 0) {
return elems;
}
let res = [];
for (let i = 0; i < elems.length; i++) {
if (elems[i].shadowRoot) {
res = res.concat(
deepQuerySelectorAll(elems[i].shadowRoot, remaining));
}
}
return res;
};
var testing_element = deepQuerySelectorAll(document, %s);
testing_element[0].%s;
"""
script_to_execute = shadowroot_script % (element, action)
return script_to_execute
def threaded_return(function):
"""
Decorator to add to a function to get that function to return a thread
object, but with the added benefit of storing its return value.
@param function: function object to be run in the thread
@return a threading.Thread object, that has already been started, is
recording its result, and can be completed and its result
fetched by calling .finish()
"""
def wrapped_t(queue, *args, **kwargs):
"""
Calls the decorated function as normal, but appends the output into
the passed-in threadsafe queue.
"""
ret = function(*args, **kwargs)
queue.put(ret)
def wrapped_finish(threaded_object):
"""
Provides a utility to this thread object, getting its result while
simultaneously joining the thread.
"""
ret = threaded_object.get()
threaded_object.join()
return ret
def wrapper(*args, **kwargs):
"""
Creates the queue and starts the thread, then assigns extra attributes
to the thread to give it result-storing capability.
"""
q = Queue.Queue()
t = threading.Thread(target=wrapped_t, args=(q,) + args, kwargs=kwargs)
t.start()
t.result_queue = q
t.get = t.result_queue.get
t.finish = lambda: wrapped_finish(t)
return t
# for the decorator
return wrapper
@threaded_return
def background_sample_until_condition(
function,
condition=lambda: True,
timeout=10,
sleep_interval=1):
"""
Records the value of the function until the condition is False or the
timeout is reached. Runs as a background thread, so it's nonblocking.
Usage might look something like:
def function():
return get_value()
def condition():
return self._keep_sampling
# main thread
sample_thread = utils.background_sample_until_condition(
function=function,condition=condition)
# do other work
# ...
self._keep_sampling = False
# blocking call to get result and join the thread
result = sample_thread.finish()
@param function: function object, 0 args, to be continually polled
@param condition: function object, 0 args, to say when to stop polling
@param timeout: maximum number of seconds to wait
@param number of seconds to wait in between polls
@return a thread object that has already been started and is running in
the background, whose run must be stopped with .finish(), which
also returns a list of the results from the sample function
"""
log = []
end_time = datetime.datetime.now() + datetime.timedelta(
seconds = timeout + sleep_interval)
while condition() and datetime.datetime.now() < end_time:
log.append(function())
time.sleep(sleep_interval)
return log
class metrics_mock(metrics_mock_class.mock_class_base):
"""mock class for metrics in case chromite is not installed."""
pass
MountInfo = collections.namedtuple('MountInfo', ['root', 'mount_point', 'tags'])
def get_mount_info(process='self', mount_point=None):
"""Retrieves information about currently mounted file systems.
@param mount_point: (optional) The mount point (a path). If this is
provided, only information about the given mount point
is returned. If this is omitted, info about all mount
points is returned.
@param process: (optional) The process id (or the string 'self') of the
process whose mountinfo will be obtained. If this is
omitted, info about the current process is returned.
@return A generator yielding one MountInfo object for each relevant mount
found in /proc/PID/mountinfo.
"""
with open('/proc/{}/mountinfo'.format(process)) as f:
for line in f.readlines():
# These lines are formatted according to the proc(5) manpage.
# Sample line:
# 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root \
# rw,errors=continue
# Fields (descriptions omitted for fields we don't care about)
# 3: the root of the mount.
# 4: the mount point.
# 5: mount options.
# 6: tags. There can be more than one of these. This is where
# shared mounts are indicated.
# 7: a dash separator marking the end of the tags.
mountinfo = line.split()
if mount_point is None or mountinfo[4] == mount_point:
tags = []
for field in mountinfo[6:]:
if field == '-':
break
tags.append(field.split(':')[0])
yield MountInfo(root = mountinfo[3],
mount_point = mountinfo[4],
tags = tags)
# Appended suffix for chart tablet naming convention in test lab
CHART_ADDRESS_SUFFIX = '-tablet'
def get_lab_chart_address(hostname):
"""Convert lab DUT hostname to address of camera box chart tablet"""
return hostname + CHART_ADDRESS_SUFFIX if is_in_container() else None