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__init__.py

00001 """SCons.Script

This file implements the main() function used by the scons script.

Architecturally, this *is* the scons script, and will likely only be
called from the external "scons" wrapper.  Consequently, anything here
should not be, or be considered, part of the build engine.  If it's
something that we expect other software to want to use, it should go in
some other module.  If it's specific to the "scons" script invocation,
it goes here.

"""

#
# Copyright (c) 2001, 2002, 2003, 2004 The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Script/__init__.py 0.96.1.D001 2004/08/23 09:55:29 knight"

import time
start_time = time.time()

import os
import os.path
import random
import string
import sys
import traceback

# Strip the script directory from sys.path() so on case-insensitive
# (WIN32) systems Python doesn't think that the "scons" script is the
# "SCons" package.  Replace it with our own version directory so, if
# if they're there, we pick up the right version of the build engine
# modules.
#sys.path = [os.path.join(sys.prefix,
#                         'lib',
#                         'scons-%d' % SCons.__version__)] + sys.path[1:]

import SCons.Debug
import SCons.Defaults
import SCons.Environment
import SCons.Errors
import SCons.Job
import SCons.Node
import SCons.Node.FS
from SCons.Optik import OptionParser, SUPPRESS_HELP, OptionValueError
import SCons.Script.SConscript
import SCons.Sig
import SCons.Taskmaster
import SCons.Util
import SCons.Warnings

#
import __builtin__
try:
    __builtin__.zip
except AttributeError:
    def zip(l1, l2):
        result = []
        for i in xrange(len(l1)):
           result.append((l1[i], l2[i]))
        return result
    __builtin__.zip = zip

#
display = SCons.Util.display
progress_display = SCons.Util.DisplayEngine()

# Task control.
#
00090 class BuildTask(SCons.Taskmaster.Task):
    """An SCons build task."""
00092     def display(self, message):
        display('scons: ' + message)

00095     def execute(self):
        target = self.targets[0]
        if target.get_state() == SCons.Node.up_to_date:
            if self.top and target.has_builder():
                display("scons: `%s' is up to date." % str(self.node))
        elif target.has_builder() and not hasattr(target.builder, 'status'):
            if print_time:
                start_time = time.time()
            SCons.Taskmaster.Task.execute(self)
            if print_time:
                finish_time = time.time()
                global command_time
                command_time = command_time+finish_time-start_time
                print "Command execution time: %f seconds"%(finish_time-start_time)

    def do_failed(self, status=2):
        global exit_status
        if ignore_errors:
            SCons.Taskmaster.Task.executed(self)
        elif keep_going_on_error:
            SCons.Taskmaster.Task.fail_continue(self)
            exit_status = status
        else:
            SCons.Taskmaster.Task.fail_stop(self)
            exit_status = status
            
00121     def executed(self):
        t = self.targets[0]
        if self.top and not t.has_builder() and not t.side_effect:
            if not t.exists():
                sys.stderr.write("scons: *** Do not know how to make target `%s'." % t)
                if not keep_going_on_error:
                    sys.stderr.write("  Stop.")
                sys.stderr.write("\n")
                self.do_failed()
            else:
                print "scons: Nothing to be done for `%s'." % t
                SCons.Taskmaster.Task.executed(self)
        else:
            SCons.Taskmaster.Task.executed(self)

        # print the tree here instead of in execute() because
        # this method is serialized, but execute isn't:
        if print_tree and self.top:
            print
            print SCons.Util.render_tree(self.targets[0], get_all_children)
        if print_dtree and self.top:
            print
            print SCons.Util.render_tree(self.targets[0], get_derived_children)
        if print_includes and self.top:
            t = self.targets[0]
            tree = t.render_include_tree()
            if tree:
                print
                print tree

00151     def failed(self):
        # Handle the failure of a build task.  The primary purpose here
        # is to display the various types of Errors and Exceptions
        # appropriately.
        status = 2
        t, e = self.exc_info()[:2]
        tb = None
        if t is None:
            # The Taskmaster didn't record an exception for this Task;
            # see if the sys module has one.
            t, e = sys.exc_info()[:2]

        if t == SCons.Errors.BuildError:
            sys.stderr.write("scons: *** [%s] %s\n" % (e.node, e.errstr))
            if e.errstr == 'Exception':
                traceback.print_exception(e.args[0], e.args[1], e.args[2])
        elif t == SCons.Errors.ExplicitExit:
            status = e.status
            sys.stderr.write("scons: *** [%s] Explicit exit, status %s\n" % (e.node, e.status))
        else:
            if e is None:
                e = t
            s = str(e)
            if t == SCons.Errors.StopError and not keep_going_on_error:
                s = s + '  Stop.'
            sys.stderr.write("scons: *** %s\n" % s)

            if tb:
                sys.stderr.write("scons: internal stack trace:\n")
                traceback.print_tb(tb, file=sys.stderr)

        self.do_failed(status)

        self.exc_clear()

00186     def make_ready(self):
        """Make a task ready for execution"""
        SCons.Taskmaster.Task.make_ready(self)
        if self.out_of_date and print_explanations:
            explanation = self.out_of_date[0].explain()
            if explanation:
                sys.stdout.write("scons: " + explanation)

00194 class CleanTask(SCons.Taskmaster.Task):
    """An SCons clean task."""
    def show(self):
        if (self.targets[0].has_builder() or self.targets[0].side_effect) \
           and not os.path.isdir(str(self.targets[0])):
            display("Removed " + str(self.targets[0]))
        if SCons.Environment.CleanTargets.has_key(self.targets[0]):
            files = SCons.Environment.CleanTargets[self.targets[0]]
            for f in files:
                SCons.Util.fs_delete(str(f), 0)

    def remove(self):
        if self.targets[0].has_builder() or self.targets[0].side_effect:
            for t in self.targets:
                try:
                    removed = t.remove()
                except OSError, e:
                    print "scons: Could not remove '%s':" % str(t), e.strerror
                else:
                    if removed:
                        display("Removed " + str(t))
        if SCons.Environment.CleanTargets.has_key(self.targets[0]):
            files = SCons.Environment.CleanTargets[self.targets[0]]
            for f in files:
                SCons.Util.fs_delete(str(f))

    execute = remove

    # Have the taskmaster arrange to "execute" all of the targets, because
    # we'll figure out ourselves (in remove() or show() above) whether
    # anything really needs to be done.
    make_ready = SCons.Taskmaster.Task.make_ready_all

00227     def prepare(self):
        pass

00230 class QuestionTask(SCons.Taskmaster.Task):
    """An SCons task for the -q (question) option."""
00232     def prepare(self):
        pass
    
00235     def execute(self):
        if self.targets[0].get_state() != SCons.Node.up_to_date:
            global exit_status
            exit_status = 1
            self.tm.stop()

00241     def executed(self):
        pass

# Global variables

keep_going_on_error = 0
print_count = 0
print_dtree = 0
print_explanations = 0
print_includes = 0
print_objects = 0
print_time = 0
print_tree = 0
memory_stats = None
ignore_errors = 0
sconscript_time = 0
command_time = 0
exit_status = 0 # exit status, assume success by default
profiling = 0
repositories = []
num_jobs = 1 # this is modifed by SConscript.SetJobs()

# Exceptions for this module
class PrintHelp(Exception):
    pass

# utility functions

def get_all_children(node): return node.all_children(None)

def get_derived_children(node):
    children = node.all_children(None)
    return filter(lambda x: x.has_builder(), children)

00275 def _scons_syntax_error(e):
    """Handle syntax errors. Print out a message and show where the error
    occurred.
    """
    etype, value, tb = sys.exc_info()
    lines = traceback.format_exception_only(etype, value)
    for line in lines:
        sys.stderr.write(line+'\n')
    sys.exit(2)

00285 def find_deepest_user_frame(tb):
    """
    Find the deepest stack frame that is not part of SCons.

    Input is a "pre-processed" stack trace in the form
    returned by traceback.extract_tb() or traceback.extract_stack()
    """
    
    tb.reverse()

    # find the deepest traceback frame that is not part
    # of SCons:
    for frame in tb:
        filename = frame[0]
        if string.find(filename, os.sep+'SCons'+os.sep) == -1:
            return frame
    return tb[0]

00303 def _scons_user_error(e):
    """Handle user errors. Print out a message and a description of the
    error, along with the line number and routine where it occured. 
    The file and line number will be the deepest stack frame that is
    not part of SCons itself.
    """
    etype, value, tb = sys.exc_info()
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_tb(tb))
    sys.stderr.write("\nscons: *** %s\n" % value)
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))
    sys.exit(2)

00315 def _scons_user_warning(e):
    """Handle user warnings. Print out a message and a description of
    the warning, along with the line number and routine where it occured.
    The file and line number will be the deepest stack frame that is
    not part of SCons itself.
    """
    etype, value, tb = sys.exc_info()
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_tb(tb))
    sys.stderr.write("\nscons: warning: %s\n" % e)
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))

00326 def _scons_internal_warning(e):
    """Slightly different from _scons_user_warning in that we use the
    *current call stack* rather than sys.exc_info() to get our stack trace.
    This is used by the warnings framework to print warnings."""
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_stack())
    sys.stderr.write("\nscons: warning: %s\n" % e[0])
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))

00334 def _scons_internal_error():
    """Handle all errors but user errors. Print out a message telling
    the user what to do in this case and print a normal trace.
    """
    print 'internal error'
    traceback.print_exc()
    sys.exit(2)

def _varargs(option, parser):
    value = None
    if parser.rargs:
        arg = parser.rargs[0]
        if arg[0] != "-":
            value = arg
            del parser.rargs[0]
    return value

00351 def _setup_warn(arg):
    """The --warn option.  An argument to this option
    should be of the form <warning-class> or no-<warning-class>.
    The warning class is munged in order to get an actual class
    name from the SCons.Warnings module to enable or disable.
    The supplied <warning-class> is split on hyphens, each element
    is captialized, then smushed back together.  Then the string
    "SCons.Warnings." is added to the front and "Warning" is added
    to the back to get the fully qualified class name.

    For example, --warn=deprecated will enable the
    SCons.Warnings.DeprecatedWarning class.

    --warn=no-dependency will disable the
    SCons.Warnings.DependencyWarning class.

    As a special case, --warn=all and --warn=no-all
    will enable or disable (respectively) the base
    class of all warnings, which is SCons.Warning.Warning."""

    elems = string.split(string.lower(arg), '-')
    enable = 1
    if elems[0] == 'no':
        enable = 0
        del elems[0]

    if len(elems) == 1 and elems[0] == 'all':
        class_name = "Warning"
    else:
        def _capitalize(s):
            if s[:5] == "scons":
                return "SCons" + s[5:]
            else:
                return string.capitalize(s)
        class_name = string.join(map(_capitalize, elems), '') + "Warning"
    try:
        clazz = getattr(SCons.Warnings, class_name)
    except AttributeError:
        sys.stderr.write("No warning type: '%s'\n" % arg)
    else:
        if enable:
            SCons.Warnings.enableWarningClass(clazz)
        else:
            SCons.Warnings.suppressWarningClass(clazz)

00396 def _SConstruct_exists(dirname=''):
    """This function checks that an SConstruct file exists in a directory.
    If so, it returns the path of the file. By default, it checks the
    current directory.
    """
    global repositories
    for file in ['SConstruct', 'Sconstruct', 'sconstruct']:
        sfile = os.path.join(dirname, file)
        if os.path.isfile(sfile):
            return sfile
        if not os.path.isabs(sfile):
            for rep in repositories:
                if os.path.isfile(os.path.join(rep, sfile)):
                    return sfile
    return None

def _set_globals(options):
    global repositories, keep_going_on_error, ignore_errors
    global print_count, print_dtree
    global print_explanations, print_includes
    global print_objects, print_time, print_tree
    global memory_outf, memory_stats

    if options.repository:
        repositories.extend(options.repository)
    keep_going_on_error = options.keep_going
    try:
        if options.debug:
            if options.debug == "count":
                print_count = 1
            elif options.debug == "dtree":
                print_dtree = 1
            elif options.debug == "explain":
                print_explanations = 1
            elif options.debug == "includes":
                print_includes = 1
            elif options.debug == "memory":
                memory_stats = []
                memory_outf = sys.stdout
            elif options.debug == "objects":
                print_objects = 1
            elif options.debug == "presub":
                SCons.Action.print_actions_presub = 1
            elif options.debug == "time":
                print_time = 1
            elif options.debug == "tree":
                print_tree = 1
    except AttributeError:
        pass
    ignore_errors = options.ignore_errors

def _create_path(plist):
    path = '.'
    for d in plist:
        if os.path.isabs(d):
            path = d
        else:
            path = path + '/' + d
    return path


class OptParser(OptionParser):
    def __init__(self):
        import __main__
        import SCons
        parts = ["SCons by Steven Knight et al.:\n"]
        try:
            parts.append("\tscript: v%s.%s, %s, by %s on %s\n" % (__main__.__version__,
                                                                  __main__.__build__,
                                                                  __main__.__date__,
                                                                  __main__.__developer__,
                                                                  __main__.__buildsys__))
        except KeyboardInterrupt:
            raise
        except:
            # On win32 there is no scons.py, so there is no __main__.__version__,
            # hence there is no script version.
            pass 
        parts.append("\tengine: v%s.%s, %s, by %s on %s\n" % (SCons.__version__,
                                                              SCons.__build__,
                                                              SCons.__date__,
                                                              SCons.__developer__,
                                                              SCons.__buildsys__))
        parts.append("Copyright (c) 2001, 2002, 2003, 2004 The SCons Foundation")
        OptionParser.__init__(self, version=string.join(parts, ''),
                              usage="usage: scons [OPTION] [TARGET] ...")

        # options ignored for compatibility
        def opt_ignore(option, opt, value, parser):
            sys.stderr.write("Warning:  ignoring %s option\n" % opt)
        self.add_option("-b", "-m", "-S", "-t", "--no-keep-going", "--stop",
                        "--touch", action="callback", callback=opt_ignore,
                        help="Ignored for compatibility.")

        self.add_option('-c', '--clean', '--remove', action="store_true",
                        dest="clean",
                        help="Remove specified targets and dependencies.")

        self.add_option('-C', '--directory', type="string", action = "append",
                        metavar="DIR",
                        help="Change to DIR before doing anything.")

        self.add_option('--cache-disable', '--no-cache',
                        action="store_true", dest='cache_disable', default=0,
                        help="Do not retrieve built targets from CacheDir.")

        self.add_option('--cache-force', '--cache-populate',
                        action="store_true", dest='cache_force', default=0,
                        help="Copy already-built targets into the CacheDir.")

        self.add_option('--cache-show',
                        action="store_true", dest='cache_show', default=0,
                        help="Print build actions for files from CacheDir.")

        def opt_not_yet(option, opt, value, parser):
            sys.stderr.write("Warning:  the %s option is not yet implemented\n" % opt)
            sys.exit(0)
        self.add_option('-d', action="callback",
                        callback=opt_not_yet,
                        help = "Print file dependency information.")
        
        self.add_option('-D', action="store_const", const=2, dest="climb_up",
                        help="Search up directory tree for SConstruct,       "
                             "build all Default() targets.")

        debug_options = ["count", "dtree", "explain",
                         "includes", "memory", "objects",
                         "pdb", "presub", "time", "tree"]

        def opt_debug(option, opt, value, parser, debug_options=debug_options):
            if value in debug_options:
                parser.values.debug = value
            else:
                raise OptionValueError("Warning:  %s is not a valid debug type" % value)
        self.add_option('--debug', action="callback", type="string",
                        callback=opt_debug, nargs=1, dest="debug",
                        metavar="TYPE",
                        help="Print various types of debugging information: "
                             "%s." % string.join(debug_options, ", "))

        def opt_duplicate(option, opt, value, parser):
            if not value in SCons.Node.FS.Valid_Duplicates:
                raise OptionValueError("`%s' is not a valid duplication style." % value)
            parser.values.duplicate = value
            # Set the duplicate style right away so it can affect linking
            # of SConscript files.
            SCons.Node.FS.set_duplicate(value)
        self.add_option('--duplicate', action="callback", type="string",
                        callback=opt_duplicate, nargs=1, dest="duplicate",
                        help="Set the preferred duplication methods. Must be one of "
                        + string.join(SCons.Node.FS.Valid_Duplicates, ", "))

        self.add_option('-f', '--file', '--makefile', '--sconstruct',
                        action="append", nargs=1,
                        help="Read FILE as the top-level SConstruct file.")

        self.add_option('-h', '--help', action="store_true", default=0,
                        dest="help_msg",
                        help="Print defined help message, or this one.")

        self.add_option("-H", "--help-options",
                        action="help",
                        help="Print this message and exit.")

        self.add_option('-i', '--ignore-errors', action="store_true",
                        default=0, dest='ignore_errors',
                        help="Ignore errors from build actions.")

        self.add_option('-I', '--include-dir', action="append",
                        dest='include_dir', metavar="DIR",
                        help="Search DIR for imported Python modules.")

        self.add_option('--implicit-cache', action="store_true",
                        dest='implicit_cache',
                        help="Cache implicit dependencies")

        self.add_option('--implicit-deps-changed', action="store_true",
                        default=0, dest='implicit_deps_changed',
                        help="Ignore cached implicit dependencies.")
        self.add_option('--implicit-deps-unchanged', action="store_true",
                        default=0, dest='implicit_deps_unchanged',
                        help="Ignore changes in implicit dependencies.")

        def opt_j(option, opt, value, parser):
            value = int(value)
            parser.values.num_jobs = value
        self.add_option('-j', '--jobs', action="callback", type="int",
                        callback=opt_j, metavar="N",
                        help="Allow N jobs at once.")

        self.add_option('-k', '--keep-going', action="store_true", default=0,
                        dest='keep_going',
                        help="Keep going when a target can't be made.")

        self.add_option('--max-drift', type="int", action="store",
                        dest='max_drift', metavar="N",
                        help="Set maximum system clock drift to N seconds.")

        self.add_option('-n', '--no-exec', '--just-print', '--dry-run',
                        '--recon', action="store_true", dest='noexec',
                        default=0, help="Don't build; just print commands.")

        def opt_profile(option, opt, value, parser):
            global profiling
            if not profiling:
                profiling = 1
                import profile
                profile.run('SCons.Script.main()', value)
                sys.exit(exit_status)
        self.add_option('--profile', nargs=1, action="callback",
                        callback=opt_profile, type="string", dest="profile",
                        metavar="FILE",
                        help="Profile SCons and put results in FILE.")

        self.add_option('-q', '--question', action="store_true", default=0,
                        help="Don't build; exit status says if up to date.")

        self.add_option('-Q', dest='no_progress', action="store_true",
                        default=0,
                        help="Suppress \"Reading/Building\" progress messages.")

        self.add_option('--random', dest="random", action="store_true",
                        default=0, help="Build dependencies in random order.")

        self.add_option('-s', '--silent', '--quiet', action="store_true",
                        default=0, help="Don't print commands.")

        self.add_option('-u', '--up', '--search-up', action="store_const",
                        dest="climb_up", default=0, const=1,
                        help="Search up directory tree for SConstruct,       "
                             "build targets at or below current directory.")
        self.add_option('-U', action="store_const", dest="climb_up",
                        default=0, const=3,
                        help="Search up directory tree for SConstruct,       "
                             "build Default() targets from local SConscript.")

        self.add_option("-v", "--version",
                        action="version",
                        help="Print the SCons version number and exit.")

        self.add_option('--warn', '--warning', nargs=1, action="store",
                        metavar="WARNING-SPEC",
                        help="Enable or disable warnings.")

        self.add_option('-Y', '--repository', nargs=1, action="append",
                        help="Search REPOSITORY for source and target files.")

        self.add_option('-e', '--environment-overrides', action="callback",
                        callback=opt_not_yet,
                        # help="Environment variables override makefiles."
                        help=SUPPRESS_HELP)
        self.add_option('-l', '--load-average', '--max-load', action="callback",
                        callback=opt_not_yet, type="int", dest="load_average",
                        # action="store",
                        # help="Don't start multiple jobs unless load is below "
                        #      "LOAD-AVERAGE."
                        # type="int",
                        help=SUPPRESS_HELP)
        self.add_option('--list-derived', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files that would be built."
                        help=SUPPRESS_HELP)
        self.add_option('--list-actions', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files and build actions."
                        help=SUPPRESS_HELP)
        self.add_option('--list-where', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files and where defined."
                        help=SUPPRESS_HELP)
        self.add_option('-o', '--old-file', '--assume-old', action="callback",
                        callback=opt_not_yet, type="string", dest="old_file",
                        # help = "Consider FILE to be old; don't rebuild it."
                        help=SUPPRESS_HELP)
        self.add_option('--override', action="callback", dest="override",
                        callback=opt_not_yet, type="string",
                        # help="Override variables as specified in FILE."
                        help=SUPPRESS_HELP)
        self.add_option('-p', action="callback",
                        callback=opt_not_yet,
                        # help="Print internal environments/objects."
                        help=SUPPRESS_HELP)
        self.add_option('-r', '-R', '--no-builtin-rules',
                        '--no-builtin-variables', action="callback",
                        callback=opt_not_yet,
                        # help="Clear default environments and variables."
                        help=SUPPRESS_HELP)
        self.add_option('-w', '--print-directory', action="callback",
                        callback=opt_not_yet,
                        # help="Print the current directory."
                        help=SUPPRESS_HELP)
        self.add_option('--no-print-directory', action="callback",
                        callback=opt_not_yet,
                        # help="Turn off -w, even if it was turned on implicitly."
                        help=SUPPRESS_HELP)
        self.add_option('--write-filenames', action="callback",
                        callback=opt_not_yet, type="string", dest="write_filenames",
                        # help="Write all filenames examined into FILE."
                        help=SUPPRESS_HELP)
        self.add_option('-W', '--what-if', '--new-file', '--assume-new',
                        dest="new_file",
                        action="callback", callback=opt_not_yet, type="string",
                        # help="Consider FILE to be changed."
                        help=SUPPRESS_HELP)
        self.add_option('--warn-undefined-variables', action="callback",
                        callback=opt_not_yet,
                        # help="Warn when an undefined variable is referenced."
                        help=SUPPRESS_HELP)

    def parse_args(self, args=None, values=None):
        opt, arglist = OptionParser.parse_args(self, args, values)
        if opt.implicit_deps_changed or opt.implicit_deps_unchanged:
            opt.implicit_cache = 1
        return opt, arglist

00711 class SConscriptSettableOptions:
    """This class wraps an OptParser instance and provides
    uniform access to options that can be either set on the command
    line or from a SConscript file. A value specified on the command
    line always overrides a value set in a SConscript file.
    Not all command line options are SConscript settable, and the ones
    that are must be explicitly added to settable dictionary and optionally
    validated and coerced in the set() method."""
    
    def __init__(self, options):
        self.options = options

        # This dictionary stores the defaults for all the SConscript
        # settable options, as well as indicating which options
        # are SConscript settable. 
        self.settable = {'num_jobs':1,
                         'max_drift':SCons.Sig.default_max_drift,
                         'implicit_cache':0,
                         'clean':0,
                         'duplicate':'hard-soft-copy'}

    def get(self, name):
        if not self.settable.has_key(name):
            raise SCons.Error.UserError, "This option is not settable from a SConscript file: %s"%name
        if hasattr(self.options, name) and getattr(self.options, name) is not None:
            return getattr(self.options, name)
        else:
            return self.settable[name]

    def set(self, name, value):
        if not self.settable.has_key(name):
            raise SCons.Error.UserError, "This option is not settable from a SConscript file: %s"%name

        if name == 'num_jobs':
            try:
                value = int(value)
                if value < 1:
                    raise ValueError
            except ValueError:
                raise SCons.Errors.UserError, "A positive integer is required: %s"%repr(value)
        elif name == 'max_drift':
            try:
                value = int(value)
            except ValueError:
                raise SCons.Errors.UserError, "An integer is required: %s"%repr(value)
        elif name == 'duplicate':
            try:
                value = str(value)
            except ValueError:
                raise SCons.Errors.UserError, "A string is required: %s"%repr(value)
            if not value in SCons.Node.FS.Valid_Duplicates:
                raise SCons.Errors.UserError, "Not a valid duplication style: %s" % value
            # Set the duplicate stye right away so it can affect linking
            # of SConscript files.
            SCons.Node.FS.set_duplicate(value)

        self.settable[name] = value
    

def _main(args, parser):
    targets = []
    fs = SCons.Node.FS.default_fs

    # Enable deprecated warnings by default.
    SCons.Warnings._warningOut = _scons_internal_warning
    SCons.Warnings.enableWarningClass(SCons.Warnings.CorruptSConsignWarning)
    SCons.Warnings.enableWarningClass(SCons.Warnings.DeprecatedWarning)
    SCons.Warnings.enableWarningClass(SCons.Warnings.DuplicateEnvironmentWarning)
    SCons.Warnings.enableWarningClass(SCons.Warnings.MissingSConscriptWarning)
    SCons.Warnings.enableWarningClass(SCons.Warnings.NoParallelSupportWarning)
    # This is good for newbies, and hopefully most everyone else too.
    SCons.Warnings.enableWarningClass(SCons.Warnings.MisleadingKeywordsWarning)

    global ssoptions
    ssoptions = SConscriptSettableOptions(options)

    if options.help_msg:
        def raisePrintHelp(text):
            raise PrintHelp, text
        SCons.Script.SConscript.HelpFunction = raisePrintHelp

    _set_globals(options)
    SCons.Node.implicit_cache = options.implicit_cache
    SCons.Node.implicit_deps_changed = options.implicit_deps_changed
    SCons.Node.implicit_deps_unchanged = options.implicit_deps_unchanged
    if options.warn:
        _setup_warn(options.warn)
    if options.noexec:
        SCons.SConf.dryrun = 1
        SCons.Action.execute_actions = None
        CleanTask.execute = CleanTask.show
    if options.question:
        SCons.SConf.dryrun = 1

    if options.no_progress or options.silent:
        progress_display.set_mode(0)
    if options.silent:
        display.set_mode(0)
    if options.silent:
        SCons.Action.print_actions = None
    if options.cache_disable:
        def disable(self): pass
        fs.CacheDir = disable
    if options.cache_force:
        fs.cache_force = 1
    if options.cache_show:
        fs.cache_show = 1
    if options.directory:
        cdir = _create_path(options.directory)
        try:
            os.chdir(cdir)
        except OSError:
            sys.stderr.write("Could not change directory to %s\n" % cdir)

    xmit_args = []
    for a in args:
        if '=' in a:
            xmit_args.append(a)
        else:
            targets.append(a)
    SCons.Script.SConscript._scons_add_args(xmit_args)
    SCons.Script.SConscript._scons_add_targets(targets)

    target_top = None
    if options.climb_up:
        target_top = '.'  # directory to prepend to targets
        script_dir = os.getcwd()  # location of script
        while script_dir and not _SConstruct_exists(script_dir):
            script_dir, last_part = os.path.split(script_dir)
            if last_part:
                target_top = os.path.join(last_part, target_top)
            else:
                script_dir = ''
        if script_dir:
            display("scons: Entering directory `%s'" % script_dir)
            os.chdir(script_dir)
        else:
            raise SCons.Errors.UserError, "No SConstruct file found."

    fs.set_toplevel_dir(os.getcwd())

    scripts = []
    if options.file:
        scripts.extend(options.file)
    if not scripts:
        sfile = _SConstruct_exists()
        if sfile:
            scripts.append(sfile)

    if options.help_msg:
        if not scripts:
            # There's no SConstruct, but they specified -h.
            # Give them the options usage now, before we fail
            # trying to read a non-existent SConstruct file.
            parser.print_help()
            sys.exit(0)
        SCons.Script.SConscript.print_help = 1

    if not scripts:
        raise SCons.Errors.UserError, "No SConstruct file found."

    if scripts[0] == "-":
        d = fs.getcwd()
    else:
        d = fs.File(scripts[0]).dir
    fs.set_SConstruct_dir(d)

    class Unbuffered:
        def __init__(self, file):
            self.file = file
        def write(self, arg):
            self.file.write(arg)
            self.file.flush()
        def __getattr__(self, attr):
            return getattr(self.file, attr)

    sys.stdout = Unbuffered(sys.stdout)

    if options.include_dir:
        sys.path = options.include_dir + sys.path

    global repositories
    for rep in repositories:
        fs.Repository(rep)

    if not memory_stats is None: memory_stats.append(SCons.Debug.memory())

    progress_display("scons: Reading SConscript files ...")
    try:
        start_time = time.time()
        try:
            for script in scripts:
                SCons.Script.SConscript._SConscript(fs, script)
        except SCons.Errors.StopError, e:
            # We had problems reading an SConscript file, such as it
            # couldn't be copied in to the BuildDir.  Since we're just
            # reading SConscript files and haven't started building
            # things yet, stop regardless of whether they used -i or -k
            # or anything else, but don't say "Stop." on the message.
            global exit_status
            sys.stderr.write("scons: *** %s\n" % e)
            exit_status = 2
            sys.exit(exit_status)
        global sconscript_time
        sconscript_time = time.time() - start_time
    except PrintHelp, text:
        progress_display("scons: done reading SConscript files.")
        print text
        print "Use scons -H for help about command-line options."
        sys.exit(0)
    progress_display("scons: done reading SConscript files.")

    # Tell the Node.FS subsystem that we're all done reading the
    # SConscript files and calling Repository() and BuildDir() and the
    # like, so it can go ahead and start memoizing the string values of
    # file system nodes.
    SCons.Node.FS.save_strings(1)

    if not memory_stats is None: memory_stats.append(SCons.Debug.memory())

    fs.chdir(fs.Top)

    if options.help_msg:
        # They specified -h, but there was no Help() inside the
        # SConscript files.  Give them the options usage.
        parser.print_help(sys.stdout)
        sys.exit(0)

    # Now that we've read the SConscripts we can set the options
    # that are SConscript settable:
    SCons.Node.implicit_cache = ssoptions.get('implicit_cache')
    SCons.Node.FS.set_duplicate(ssoptions.get('duplicate'))

    lookup_top = None
    if targets:
        # They specified targets on the command line, so if they
        # used -u, -U or -D, we have to look up targets relative
        # to the top, but we build whatever they specified.
        if target_top:
            lookup_top = fs.Dir(target_top)
            target_top = None
    else:
        # There are no targets specified on the command line,
        # so if they used -u, -U or -D, we may have to restrict
        # what actually gets built.
        d = None
        if target_top:
            if options.climb_up == 1:
                # -u, local directory and below
                target_top = fs.Dir(target_top)
                lookup_top = target_top
            elif options.climb_up == 2:
                # -D, all Default() targets
                target_top = None
                lookup_top = None
            elif options.climb_up == 3:
                # -U, local SConscript Default() targets
                target_top = fs.Dir(target_top)
                def check_dir(x, target_top=target_top):
                    if hasattr(x, 'cwd') and not x.cwd is None:
                        cwd = x.cwd.srcnode()
                        return cwd == target_top
                    else:
                        # x doesn't have a cwd, so it's either not a target,
                        # or not a file, so go ahead and keep it as a default
                        # target and let the engine sort it out:
                        return 1                
                d = filter(check_dir, SCons.Script.SConscript.DefaultTargets)
                SCons.Script.SConscript.DefaultTargets[:] = d
                target_top = None
                lookup_top = None

        if SCons.Script.SConscript.DefaultCalled:
            targets = SCons.Script.SConscript.DefaultTargets
        else:
            if d is None:
                d = [fs.Dir('.')]
            targets = d


    if not targets:
        sys.stderr.write("scons: *** No targets specified and no Default() targets found.  Stop.\n")
        sys.exit(2)

    def Entry(x, ltop=lookup_top, ttop=target_top, fs=fs):
        if isinstance(x, SCons.Node.Node):
            node = x
        else:
            node = SCons.Node.Alias.default_ans.lookup(x)
            if node is None:
                node = fs.Entry(x, directory=ltop, create=1)
        if ttop and not node.is_under(ttop):
            if isinstance(node, SCons.Node.FS.Dir) and ttop.is_under(node):
                node = ttop
            else:
                node = None
        return node

    nodes = filter(lambda x: x is not None, map(Entry, targets))

    task_class = BuildTask    # default action is to build targets
    opening_message = "Building targets ..."
    closing_message = "done building targets."
    failure_message = "building terminated because of errors."
    if options.question:
        task_class = QuestionTask
    try:
        if ssoptions.get('clean'):
            task_class = CleanTask
            opening_message = "Cleaning targets ..."
            closing_message = "done cleaning targets."
            failure_message = "cleaning terminated because of errors."
    except AttributeError:
        pass

    SCons.Environment.CalculatorArgs['max_drift'] = ssoptions.get('max_drift')

    if options.random:
        def order(dependencies):
            """Randomize the dependencies."""
            # This is cribbed from the implementation of
            # random.shuffle() in Python 2.X.
            d = dependencies
            for i in xrange(len(d)-1, 0, -1):
                j = int(random.random() * (i+1))
                d[i], d[j] = d[j], d[i]
            return d
    else:
        def order(dependencies):
            """Leave the order of dependencies alone."""
            return dependencies

    progress_display("scons: " + opening_message)
    taskmaster = SCons.Taskmaster.Taskmaster(nodes, task_class, order)

    nj = ssoptions.get('num_jobs')
    jobs = SCons.Job.Jobs(nj, taskmaster)
    if nj > 1 and jobs.num_jobs == 1:
        msg = "parallel builds are unsupported by this version of Python;\n" + \
              "\tignoring -j or num_jobs option.\n"
        SCons.Warnings.warn(SCons.Warnings.NoParallelSupportWarning, msg)

    if not memory_stats is None: memory_stats.append(SCons.Debug.memory())

    try:
        jobs.run()
    finally:
        if exit_status:
            progress_display("scons: " + failure_message)
        else:
            progress_display("scons: " + closing_message)
        if not options.noexec:
            SCons.SConsign.write()

    if not memory_stats is None:
        memory_stats.append(SCons.Debug.memory())
        when = [
            'before SConscript files',
            'after SConscript files',
            'before building',
            'after building',
        ]
        for i in xrange(len(when)):
            memory_outf.write('Memory %s:  %d\n' % (when[i], memory_stats[i]))

    if print_count:
        SCons.Debug.countLoggedInstances('*')

    if print_objects:
        SCons.Debug.listLoggedInstances('*')
        #SCons.Debug.dumpLoggedInstances('*')

def _exec_main():
    all_args = sys.argv[1:]
    try:
        all_args = string.split(os.environ['SCONSFLAGS']) + all_args
    except KeyError:
            # it's OK if there's no SCONSFLAGS
            pass
    parser = OptParser()
    global options
    options, args = parser.parse_args(all_args)
    if options.debug == "pdb":
        import pdb
        pdb.Pdb().runcall(_main, args, parser)
    else:
        _main(args, parser)

def main():
    global exit_status
    
    try:
      _exec_main()
    except SystemExit, s:
        if s:
            exit_status = s
    except KeyboardInterrupt:
        print "Build interrupted."
        sys.exit(2)
    except SyntaxError, e:
        _scons_syntax_error(e)
    except SCons.Errors.InternalError:
        _scons_internal_error()
    except SCons.Errors.UserError, e:
        _scons_user_error(e)
    except SCons.Errors.ConfigureDryRunError, e:
        _scons_configure_dryrun_error(e)
    except:
        # An exception here is likely a builtin Python exception Python
        # code in an SConscript file.  Show them precisely what the
        # problem was and where it happened.
        SCons.Script.SConscript.SConscript_exception()
        sys.exit(2)

    if print_time:
        total_time = time.time()-start_time
        scons_time = total_time-sconscript_time-command_time
        print "Total build time: %f seconds"%total_time
        print "Total SConscript file execution time: %f seconds"%sconscript_time
        print "Total SCons execution time: %f seconds"%scons_time
        print "Total command execution time: %f seconds"%command_time

    sys.exit(exit_status)

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