blob: 4633ffd953437e65cf695879facf547164613e0a [file] [log] [blame]
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Purpose of this module is to hold common script/commandline functionality.
This ranges from optparse, to a basic script wrapper setup (much like
what is used for chromite.bin.*).
import argparse
import collections
import functools
import logging
import os
import optparse
import signal
import sys
import tempfile
# TODO(build): sort the buildbot.constants/lib.constants issue;
# lib shouldn't have to import from buildbot like this.
from chromite.buildbot import constants
from chromite.lib import cros_build_lib
from chromite.lib import git
from chromite.lib import gs
from chromite.lib import osutils
CheckoutInfo = collections.namedtuple(
'CheckoutInfo', ['type', 'root', 'chrome_src_dir'])
def DetermineCheckout(cwd):
"""Gather information on the checkout we are in.
A CheckoutInfo object with these attributes:
type: The type of checkout. Valid values are CHECKOUT_TYPE_*.
root: The root of the checkout.
chrome_src_dir: If the checkout is a Chrome checkout, the path to the
Chrome src/ directory.
root, path = None, None
for path in osutils.IteratePathParents(cwd):
repo_dir = os.path.join(path, '.repo')
if os.path.isdir(repo_dir):
checkout_type = CHECKOUT_TYPE_REPO
gclient_file = os.path.join(path, '.gclient')
if os.path.exists(gclient_file):
submodule_git = os.path.join(path, '.git')
if (os.path.isdir(submodule_git) and
git.IsSubmoduleCheckoutRoot(cwd, 'origin', constants.CHROMIUM_GOB_URL)):
if checkout_type != CHECKOUT_TYPE_UNKNOWN:
root = path
# Determine the chrome src directory.
chrome_src_dir = None
if checkout_type == CHECKOUT_TYPE_GCLIENT:
chrome_src_dir = os.path.join(root, 'src')
elif checkout_type == CHECKOUT_TYPE_SUBMODULE:
chrome_src_dir = root
return CheckoutInfo(checkout_type, root, chrome_src_dir)
def GetCacheDir():
"""Calculate the current cache dir.
Users can configure the cache dir using the --cache-dir argument and it is
shared between cbuildbot and all child processes. If no cache dir is
specified, FindCacheDir finds an alternative location to store the cache.
The path to the cache dir.
return os.environ.get(
BaseParser.FindCacheDir(None, None))
def AbsolutePath(_option, _opt, value):
"""Expand paths and make them absolute."""
return osutils.ExpandPath(value)
def NormalizeGSPath(value):
"""Expand paths and make them absolute."""
return gs.CanonicalizeURL(value, strict=True).rstrip('/')
def OptparseWrapCheck(desc, check_f, _option, opt, value):
"""Optparse adapter for type checking functionality."""
return check_f(value)
except ValueError:
raise optparse.OptionValueError(
'Invalid %s given: --%s=%s' % (desc, opt, value))
'path': osutils.ExpandPath,
'gs_path': NormalizeGSPath,
class Option(optparse.Option):
"""Subclass to implement path evaluation & other useful types."""
_EXTRA_TYPES = ("path", "gs_path")
TYPES = optparse.Option.TYPES + _EXTRA_TYPES
TYPE_CHECKER = optparse.Option.TYPE_CHECKER.copy()
for t in _EXTRA_TYPES:
TYPE_CHECKER[t] = functools.partial(OptparseWrapCheck, t, VALID_TYPES[t])
class FilteringOption(Option):
"""Subclass that supports Option filtering for FilteringOptionParser"""
def take_action(self, action, dest, opt, value, values, parser):
if action in FilteringOption.ACTIONS:
Option.take_action(self, action, dest, opt, value, values, parser)
if value is None:
value = []
elif not self.nargs or self.nargs <= 1:
value = [value]
parser.AddParsedArg(self, opt, [str(v) for v in value])
class BaseParser(object):
"""Base parser class that includes the logic to add logging controls."""
DEFAULT_LOG_LEVELS = ('fatal', 'critical', 'error', 'warning', 'info',
REPO_CACHE_DIR = '.cache'
CHROME_CACHE_DIR = '.cros_cache'
def __init__(self, **kwargs):
"""Initialize this parser instance.
logging: Defaults to ALLOW_LOGGING from the class; if given,
add --log-level.
default_log_level: If logging is enabled, override the default logging
level. Defaults to the class's DEFAULT_LOG_LEVEL value.
log_levels: If logging is enabled, this overrides the enumeration of
allowed logging levels. If not given, defaults to the classes
manual_debug: If logging is enabled and this is True, suppress addition
of a --debug alias. This option defaults to True unless 'debug' has
been exempted from the allowed logging level targets.
caching: If given, must be either a callable that discerns the cache
location if it wasn't specified (the prototype must be akin to
lambda parser, values:calculated_cache_dir_path; it may return None to
indicate that it handles setting the value on its own later in the
parsing including setting the env), or True; if True, the
machinery defaults to invoking the class's FindCacheDir method
(which can be overridden). FindCacheDir $CROS_CACHEDIR, falling
back to $REPO/.cache, finally falling back to $TMP.
Note that the cache_dir is not created, just discerned where it
should live.
If False, or caching is not given and the class attr SUPPORTS_CACHING
is False, then no --cache-dir option will be added.
self.debug_enabled = False
self.caching_group = None
self.debug_group = None
self.default_log_level = None
self.log_levels = None
self.logging_enabled = kwargs.get('logging', self.ALLOW_LOGGING)
self.default_log_level = kwargs.get('default_log_level',
self.log_levels = tuple(x.lower() for x in
kwargs.get('log_levels', self.DEFAULT_LOG_LEVELS))
self.debug_enabled = (not kwargs.get('manual_debug', False)
and 'debug' in self.log_levels)
self.caching = kwargs.get('caching', self.SUPPORTS_CACHING)
def PopUsedArgs(kwarg_dict):
"""Removes keys used by the base parser from the kwarg namespace."""
parser_keys = ['logging', 'default_log_level', 'log_levels', 'manual_debug',
for key in parser_keys:
kwarg_dict.pop(key, None)
def SetupOptions(self):
"""Sets up special chromite options for an OptionParser."""
if self.logging_enabled:
self.debug_group = self.add_option_group("Debug options")
self.debug_group, "--log-level", choices=self.log_levels,
help="Set logging level to report at.")
if self.debug_enabled:
self.debug_group, "--debug", action="store_const", const="debug",
dest="log_level", help="Alias for `--log-level=debug`. "
"Useful for debugging bugs/failures.")
self.debug_group, '--nocolor', action='store_false', dest='color',
help='Do not use colorized output (or `export NOCOLOR=true`)')
if self.caching:
self.caching_group = self.add_option_group("Caching Options")
self.caching_group, "--cache-dir", default=None, type='path',
help="Override the calculated chromeos cache directory; "
"typically defaults to '$REPO/.cache' .")
def SetupLogging(self, opts):
value = opts.log_level.upper()
logging.getLogger().setLevel(getattr(logging, value))
return value
def DoPostParseSetup(self, opts, args):
"""Method called to handle post opts/args setup.
This can be anything from logging setup to positional arg count validation.
opts: optparse.Values or argparse.Namespace instance
args: position arguments unconsumed from parsing.
(opts, args), w/ whatever modification done.
if self.logging_enabled:
value = self.SetupLogging(opts)
if self.debug_enabled:
opts.debug = (value == "DEBUG")
if self.caching:
path = os.environ.get(constants.SHARED_CACHE_ENVVAR)
if path is not None and opts.cache_dir is None:
opts.cache_dir = os.path.abspath(path)
opts.cache_dir_specified = opts.cache_dir is not None
if not opts.cache_dir_specified:
func = self.FindCacheDir if not callable(self.caching) else self.caching
opts.cache_dir = func(self, opts)
if opts.cache_dir is not None:
return opts, args
def ConfigureCacheDir(cache_dir):
if cache_dir is None:
os.environ.pop(constants.SHARED_CACHE_ENVVAR, None)
logging.debug("Removed cache_dir setting")
os.environ[constants.SHARED_CACHE_ENVVAR] = cache_dir
logging.debug("Configured cache_dir to %r", cache_dir)
def FindCacheDir(cls, _parser, _opts):
logging.debug('Cache dir lookup.')
checkout = DetermineCheckout(os.getcwd())
path = None
if checkout.type == CHECKOUT_TYPE_REPO:
path = os.path.join(checkout.root, cls.REPO_CACHE_DIR)
path = os.path.join(checkout.root, cls.CHROME_CACHE_DIR)
elif checkout.type == CHECKOUT_TYPE_UNKNOWN:
path = os.path.join(tempfile.gettempdir(), 'chromeos-cache')
raise AssertionError('Unexpected type %s' % checkout.type)
return path
def add_option_group(self, *args, **kwargs):
"""Returns a new option group see optparse.OptionParser.add_option_group."""
raise NotImplementedError('Subclass must override this method')
def add_option_to_group(group, *args, **kwargs):
"""Adds the given option defined by args and kwargs to group."""
group.add_option(*args, **kwargs)
class ArgumentNamespace(argparse.Namespace):
"""Class to mimic argparse.Namespace with value freezing support."""
__metaclass__ = cros_build_lib.FrozenAttributesClass
_FROZEN_ERR_MSG = 'Option values are frozen, cannot alter %s.'
# Note that because optparse.Values is not a new-style class this class
# must use the mixin FrozenAttributesMixin rather than the metaclass
# FrozenAttributesClass.
class OptionValues(cros_build_lib.FrozenAttributesMixin, optparse.Values):
"""Class to mimic optparse.Values with value freezing support."""
_FROZEN_ERR_MSG = 'Option values are frozen, cannot alter %s.'
def __init__(self, defaults, *args, **kwargs):
optparse.Values.__init__(self, defaults, *args, **kwargs)
# Used by FilteringParser.
self.parsed_args = None
class OptionParser(optparse.OptionParser, BaseParser):
"""Custom parser adding our custom option class in.
Aside from adding a couple of types (path for absolute paths,
gs_path for google storage urls, and log_level for logging level control),
this additionally exposes logging control by default; if undesired,
either derive from this class setting ALLOW_LOGGING to False, or
pass in logging=False to the constructor.
def __init__(self, usage=None, **kwargs):
BaseParser.__init__(self, **kwargs)
kwargs.setdefault("option_class", self.DEFAULT_OPTION_CLASS)
optparse.OptionParser.__init__(self, usage=usage, **kwargs)
def parse_args(self, args=None, values=None):
# If no Values object is specified then use our custom OptionValues.
if values is None:
values = OptionValues(defaults=self.defaults)
opts, remaining = optparse.OptionParser.parse_args(
self, args=args, values=values)
return self.DoPostParseSetup(opts, remaining)
PassedOption = collections.namedtuple(
'PassedOption', ['opt_inst', 'opt_str', 'value_str'])
class FilteringParser(OptionParser):
"""Custom option parser for filtering options."""
def parse_args(self, args=None, values=None):
# If no Values object is specified then use our custom OptionValues.
if values is None:
values = OptionValues(defaults=self.defaults)
values.parsed_args = []
return OptionParser.parse_args(self, args=args, values=values)
def AddParsedArg(self, opt_inst, opt_str, value_str):
"""Add a parsed argument with attributes.
opt_inst: An instance of a raw optparse.Option object that represents the
opt_str: The option string.
value_str: A list of string-ified values dentified by OptParse.
self.values.parsed_args.append(PassedOption(opt_inst, opt_str, value_str))
def FilterArgs(parsed_args, filter_fn):
"""Filter the argument by passing it through a function.
parsed_args: The list of parsed argument namedtuples to filter. Tuples
are of the form (opt_inst, opt_str, value_str).
filter_fn: A function with signature f(PassedOption), and returns True if
the argument is to be passed through. False if not.
A tuple containing two lists - one of accepted arguments and one of
removed arguments.
removed = []
accepted = []
for arg in parsed_args:
target = accepted if filter_fn(arg) else removed
return accepted, removed
# pylint: disable=R0901
class ArgumentParser(BaseParser, argparse.ArgumentParser):
"""Custom argument parser for use by chromite.
This class additionally exposes logging control by default; if undesired,
either derive from this class setting ALLOW_LOGGING to False, or
pass in logging=False to the constructor.
# pylint: disable=W0231
def __init__(self, usage=None, **kwargs):
BaseParser.__init__(self, **kwargs)
argparse.ArgumentParser.__init__(self, usage=usage, **kwargs)
def _SetupTypes(self):
"""Register types with ArgumentParser."""
for t, check_f in VALID_TYPES.iteritems():
self.register('type', t, check_f)
def add_option_group(self, *args, **kwargs):
"""Return an argument group rather than an option group."""
return self.add_argument_group(*args, **kwargs)
def add_option_to_group(group, *args, **kwargs):
"""Adds an argument rather than an option to the given group."""
return group.add_argument(*args, **kwargs)
def parse_args(self, args=None, namespace=None):
"""Translates OptionParser call to equivalent ArgumentParser call."""
# If no Namespace object is specified then use our custom ArgumentNamespace.
if namespace is None:
namespace = ArgumentNamespace()
# Unlike OptionParser, ArgParser works only with a single namespace and no
# args. Re-use BaseParser DoPostParseSetup but only take the namespace.
namespace = argparse.ArgumentParser.parse_args(
self, args=args, namespace=namespace)
return self.DoPostParseSetup(namespace, None)[0]
class _ShutDownException(SystemExit):
"""Exception raised when user hits CTRL+C."""
def __init__(self, sig_num, message):
self.signal = sig_num
# Setup a usage message primarily for any code that may intercept it
# while this exception is crashing back up the stack to us.
SystemExit.__init__(self, message)
self.args = (sig_num, message)
def _DefaultHandler(signum, _frame):
# Don't double process sigterms; just trigger shutdown from the first
# exception.
signal.signal(signum, signal.SIG_IGN)
raise _ShutDownException(
signum, "Received signal %i; shutting down" % (signum,))
def ScriptWrapperMain(find_target_func, argv=None,
"""Function usable for chromite.script.* style wrapping.
Note that this function invokes sys.exit on the way out by default.
find_target_func: a function, which, when given the absolute
pathway the script was invoked via (for example,
/home/ferringb/cros/trunk/chromite/bin/cros_sdk; note that any
trailing .py from the path name will be removed),
will return the main function to invoke (that functor will take
a single arg- a list of arguments, and shall return either None
or an integer, to indicate the exit code).
argv: sys.argv, or an equivalent tuple for testing. If nothing is
given, sys.argv is defaulted to.
log_level: Default logging level to start at.
log_format: Default logging format to use.
if argv is None:
argv = sys.argv[:]
target = os.path.abspath(argv[0])
name = os.path.basename(target)
if target.endswith('.py'):
target = os.path.splitext(target)[0]
target = find_target_func(target)
if target is None:
print >> sys.stderr, ("Internal error detected- no main "
"functor found in module %r." % (name,))
# Set up basic logging information for all modules that use logging.
# Note a script target may setup default logging in its module namespace
# which will take precedence over this.
signal.signal(signal.SIGTERM, _DefaultHandler)
ret = 1
ret = target(argv[1:])
except _ShutDownException as e:
print >> sys.stderr, ("%s: Signaled to shutdown: caught %i signal." %
(name, e.signal,))
except SystemExit as e:
# Right now, let this crash through- longer term, we'll update the scripts
# in question to not use sys.exit, and make this into a flagged error.
except Exception as e:
print >> sys.stderr, ("%s: Unhandled exception:" % (name,))
if ret is None:
ret = 0