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chromium / native_client / src / third_party / scons-2.0.1 / refs/heads/master / . / engine / SCons / Node / FS.py
blob: 0997fc077199d030ed66eeb50523a5e65d5c2f39 [file] [log] [blame] [edit]
"""scons.Node.FS
File system nodes.
These Nodes represent the canonical external objects that people think
of when they think of building software: files and directories.
This holds a "default_fs" variable that should be initialized with an FS
that can be used by scripts or modules looking for the canonical default.
"""
#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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__ = "src/engine/SCons/Node/FS.py 5134 2010/08/16 23:02:40 bdeegan"
import fnmatch
import os
import re
import shutil
import stat
import sys
import time
import codecs
import SCons.Action
from SCons.Debug import logInstanceCreation
import SCons.Errors
import SCons.Memoize
import SCons.Node
import SCons.Node.Alias
import SCons.Subst
import SCons.Util
import SCons.Warnings
from SCons.Debug import Trace
do_store_info = True
class EntryProxyAttributeError(AttributeError):
"""
An AttributeError subclass for recording and displaying the name
of the underlying Entry involved in an AttributeError exception.
"""
def __init__(self, entry_proxy, attribute):
AttributeError.__init__(self)
self.entry_proxy = entry_proxy
self.attribute = attribute
def __str__(self):
entry = self.entry_proxy.get()
fmt = "%s instance %s has no attribute %s"
return fmt % (entry.__class__.__name__,
repr(entry.name),
repr(self.attribute))
# The max_drift value: by default, use a cached signature value for
# any file that's been untouched for more than two days.
default_max_drift = 2*24*60*60
#
# We stringify these file system Nodes a lot. Turning a file system Node
# into a string is non-trivial, because the final string representation
# can depend on a lot of factors: whether it's a derived target or not,
# whether it's linked to a repository or source directory, and whether
# there's duplication going on. The normal technique for optimizing
# calculations like this is to memoize (cache) the string value, so you
# only have to do the calculation once.
#
# A number of the above factors, however, can be set after we've already
# been asked to return a string for a Node, because a Repository() or
# VariantDir() call or the like may not occur until later in SConscript
# files. So this variable controls whether we bother trying to save
# string values for Nodes. The wrapper interface can set this whenever
# they're done mucking with Repository and VariantDir and the other stuff,
# to let this module know it can start returning saved string values
# for Nodes.
#
Save_Strings = None
def save_strings(val):
global Save_Strings
Save_Strings = val
#
# Avoid unnecessary function calls by recording a Boolean value that
# tells us whether or not os.path.splitdrive() actually does anything
# on this system, and therefore whether we need to bother calling it
# when looking up path names in various methods below.
#
do_splitdrive = None
def initialize_do_splitdrive():
global do_splitdrive
drive, path = os.path.splitdrive('X:/foo')
do_splitdrive = not not drive
initialize_do_splitdrive()
#
needs_normpath_check = None
def initialize_normpath_check():
"""
Initialize the normpath_check regular expression.
This function is used by the unit tests to re-initialize the pattern
when testing for behavior with different values of os.sep.
"""
global needs_normpath_check
if os.sep == '/':
pattern = r'.*/|\.$|\.\.$'
else:
pattern = r'.*[/%s]|\.$|\.\.$' % re.escape(os.sep)
needs_normpath_check = re.compile(pattern)
initialize_normpath_check()
#
# SCons.Action objects for interacting with the outside world.
#
# The Node.FS methods in this module should use these actions to
# create and/or remove files and directories; they should *not* use
# os.{link,symlink,unlink,mkdir}(), etc., directly.
#
# Using these SCons.Action objects ensures that descriptions of these
# external activities are properly displayed, that the displays are
# suppressed when the -s (silent) option is used, and (most importantly)
# the actions are disabled when the the -n option is used, in which case
# there should be *no* changes to the external file system(s)...
#
if hasattr(os, 'link'):
def _hardlink_func(fs, src, dst):
# If the source is a symlink, we can't just hard-link to it
# because a relative symlink may point somewhere completely
# different. We must disambiguate the symlink and then
# hard-link the final destination file.
while fs.islink(src):
link = fs.readlink(src)
if not os.path.isabs(link):
src = link
else:
src = os.path.join(os.path.dirname(src), link)
fs.link(src, dst)
else:
_hardlink_func = None
if hasattr(os, 'symlink'):
def _softlink_func(fs, src, dst):
fs.symlink(src, dst)
else:
_softlink_func = None
def _copy_func(fs, src, dest):
shutil.copy2(src, dest)
st = fs.stat(src)
fs.chmod(dest, stat.S_IMODE(st[stat.ST_MODE]) | stat.S_IWRITE)
Valid_Duplicates = ['hard-soft-copy', 'soft-hard-copy',
'hard-copy', 'soft-copy', 'copy']
Link_Funcs = [] # contains the callables of the specified duplication style
def set_duplicate(duplicate):
# Fill in the Link_Funcs list according to the argument
# (discarding those not available on the platform).
# Set up the dictionary that maps the argument names to the
# underlying implementations. We do this inside this function,
# not in the top-level module code, so that we can remap os.link
# and os.symlink for testing purposes.
link_dict = {
'hard' : _hardlink_func,
'soft' : _softlink_func,
'copy' : _copy_func
}
if not duplicate in Valid_Duplicates:
raise SCons.Errors.InternalError("The argument of set_duplicate "
"should be in Valid_Duplicates")
global Link_Funcs
Link_Funcs = []
for func in duplicate.split('-'):
if link_dict[func]:
Link_Funcs.append(link_dict[func])
def LinkFunc(target, source, env):
# Relative paths cause problems with symbolic links, so
# we use absolute paths, which may be a problem for people
# who want to move their soft-linked src-trees around. Those
# people should use the 'hard-copy' mode, softlinks cannot be
# used for that; at least I have no idea how ...
src = source[0].abspath
dest = target[0].abspath
dir, file = os.path.split(dest)
if dir and not target[0].fs.isdir(dir):
os.makedirs(dir)
if not Link_Funcs:
# Set a default order of link functions.
set_duplicate('hard-soft-copy')
fs = source[0].fs
# Now link the files with the previously specified order.
for func in Link_Funcs:
try:
func(fs, src, dest)
break
except (IOError, OSError):
# An OSError indicates something happened like a permissions
# problem or an attempt to symlink across file-system
# boundaries. An IOError indicates something like the file
# not existing. In either case, keeping trying additional
# functions in the list and only raise an error if the last
# one failed.
if func == Link_Funcs[-1]:
# exception of the last link method (copy) are fatal
raise
return 0
Link = SCons.Action.Action(LinkFunc, None)
def LocalString(target, source, env):
return 'Local copy of %s from %s' % (target[0], source[0])
LocalCopy = SCons.Action.Action(LinkFunc, LocalString)
def UnlinkFunc(target, source, env):
t = target[0]
t.fs.unlink(t.abspath)
return 0
Unlink = SCons.Action.Action(UnlinkFunc, None)
def MkdirFunc(target, source, env):
t = target[0]
if not t.exists():
t.fs.mkdir(t.abspath)
return 0
Mkdir = SCons.Action.Action(MkdirFunc, None, presub=None)
MkdirBuilder = None
def get_MkdirBuilder():
global MkdirBuilder
if MkdirBuilder is None:
import SCons.Builder
import SCons.Defaults
# "env" will get filled in by Executor.get_build_env()
# calling SCons.Defaults.DefaultEnvironment() when necessary.
MkdirBuilder = SCons.Builder.Builder(action = Mkdir,
env = None,
explain = None,
is_explicit = None,
target_scanner = SCons.Defaults.DirEntryScanner,
name = "MkdirBuilder")
return MkdirBuilder
class _Null(object):
pass
_null = _Null()
DefaultSCCSBuilder = None
DefaultRCSBuilder = None
def get_DefaultSCCSBuilder():
global DefaultSCCSBuilder
if DefaultSCCSBuilder is None:
import SCons.Builder
# "env" will get filled in by Executor.get_build_env()
# calling SCons.Defaults.DefaultEnvironment() when necessary.
act = SCons.Action.Action('$SCCSCOM', '$SCCSCOMSTR')
DefaultSCCSBuilder = SCons.Builder.Builder(action = act,
env = None,
name = "DefaultSCCSBuilder")
return DefaultSCCSBuilder
def get_DefaultRCSBuilder():
global DefaultRCSBuilder
if DefaultRCSBuilder is None:
import SCons.Builder
# "env" will get filled in by Executor.get_build_env()
# calling SCons.Defaults.DefaultEnvironment() when necessary.
act = SCons.Action.Action('$RCS_COCOM', '$RCS_COCOMSTR')
DefaultRCSBuilder = SCons.Builder.Builder(action = act,
env = None,
name = "DefaultRCSBuilder")
return DefaultRCSBuilder
# Cygwin's os.path.normcase pretends it's on a case-sensitive filesystem.
_is_cygwin = sys.platform == "cygwin"
if os.path.normcase("TeSt") == os.path.normpath("TeSt") and not _is_cygwin:
def _my_normcase(x):
return x
else:
def _my_normcase(x):
return x.upper()
class DiskChecker(object):
def __init__(self, type, do, ignore):
self.type = type
self.do = do
self.ignore = ignore
self.func = do
def __call__(self, *args, **kw):
return self.func(*args, **kw)
def set(self, list):
if self.type in list:
self.func = self.do
else:
self.func = self.ignore
def do_diskcheck_match(node, predicate, errorfmt):
result = predicate()
try:
# If calling the predicate() cached a None value from stat(),
# remove it so it doesn't interfere with later attempts to
# build this Node as we walk the DAG. (This isn't a great way
# to do this, we're reaching into an interface that doesn't
# really belong to us, but it's all about performance, so
# for now we'll just document the dependency...)
if node._memo['stat'] is None:
del node._memo['stat']
except (AttributeError, KeyError):
pass
if result:
raise TypeError(errorfmt % node.abspath)
def ignore_diskcheck_match(node, predicate, errorfmt):
pass
def do_diskcheck_rcs(node, name):
try:
rcs_dir = node.rcs_dir
except AttributeError:
if node.entry_exists_on_disk('RCS'):
rcs_dir = node.Dir('RCS')
else:
rcs_dir = None
node.rcs_dir = rcs_dir
if rcs_dir:
return rcs_dir.entry_exists_on_disk(name+',v')
return None
def ignore_diskcheck_rcs(node, name):
return None
def do_diskcheck_sccs(node, name):
try:
sccs_dir = node.sccs_dir
except AttributeError:
if node.entry_exists_on_disk('SCCS'):
sccs_dir = node.Dir('SCCS')
else:
sccs_dir = None
node.sccs_dir = sccs_dir
if sccs_dir:
return sccs_dir.entry_exists_on_disk('s.'+name)
return None
def ignore_diskcheck_sccs(node, name):
return None
diskcheck_match = DiskChecker('match', do_diskcheck_match, ignore_diskcheck_match)
diskcheck_rcs = DiskChecker('rcs', do_diskcheck_rcs, ignore_diskcheck_rcs)
diskcheck_sccs = DiskChecker('sccs', do_diskcheck_sccs, ignore_diskcheck_sccs)
diskcheckers = [
diskcheck_match,
diskcheck_rcs,
diskcheck_sccs,
]
def set_diskcheck(list):
for dc in diskcheckers:
dc.set(list)
def diskcheck_types():
return [dc.type for dc in diskcheckers]
class EntryProxy(SCons.Util.Proxy):
__str__ = SCons.Util.Delegate('__str__')
def __get_abspath(self):
entry = self.get()
return SCons.Subst.SpecialAttrWrapper(entry.get_abspath(),
entry.name + "_abspath")
def __get_filebase(self):
name = self.get().name
return SCons.Subst.SpecialAttrWrapper(SCons.Util.splitext(name)[0],
name + "_filebase")
def __get_suffix(self):
name = self.get().name
return SCons.Subst.SpecialAttrWrapper(SCons.Util.splitext(name)[1],
name + "_suffix")
def __get_file(self):
name = self.get().name
return SCons.Subst.SpecialAttrWrapper(name, name + "_file")
def __get_base_path(self):
"""Return the file's directory and file name, with the
suffix stripped."""
entry = self.get()
return SCons.Subst.SpecialAttrWrapper(SCons.Util.splitext(entry.get_path())[0],
entry.name + "_base")
def __get_posix_path(self):
"""Return the path with / as the path separator,
regardless of platform."""
if os.sep == '/':
return self
else:
entry = self.get()
r = entry.get_path().replace(os.sep, '/')
return SCons.Subst.SpecialAttrWrapper(r, entry.name + "_posix")
def __get_windows_path(self):
"""Return the path with \ as the path separator,
regardless of platform."""
if os.sep == '\\':
return self
else:
entry = self.get()
r = entry.get_path().replace(os.sep, '\\')
return SCons.Subst.SpecialAttrWrapper(r, entry.name + "_windows")
def __get_srcnode(self):
return EntryProxy(self.get().srcnode())
def __get_srcdir(self):
"""Returns the directory containing the source node linked to this
node via VariantDir(), or the directory of this node if not linked."""
return EntryProxy(self.get().srcnode().dir)
def __get_rsrcnode(self):
return EntryProxy(self.get().srcnode().rfile())
def __get_rsrcdir(self):
"""Returns the directory containing the source node linked to this
node via VariantDir(), or the directory of this node if not linked."""
return EntryProxy(self.get().srcnode().rfile().dir)
def __get_dir(self):
return EntryProxy(self.get().dir)
dictSpecialAttrs = { "base" : __get_base_path,
"posix" : __get_posix_path,
"windows" : __get_windows_path,
"win32" : __get_windows_path,
"srcpath" : __get_srcnode,
"srcdir" : __get_srcdir,
"dir" : __get_dir,
"abspath" : __get_abspath,
"filebase" : __get_filebase,
"suffix" : __get_suffix,
"file" : __get_file,
"rsrcpath" : __get_rsrcnode,
"rsrcdir" : __get_rsrcdir,
}
def __getattr__(self, name):
# This is how we implement the "special" attributes
# such as base, posix, srcdir, etc.
try:
attr_function = self.dictSpecialAttrs[name]
except KeyError:
try:
attr = SCons.Util.Proxy.__getattr__(self, name)
except AttributeError, e:
# Raise our own AttributeError subclass with an
# overridden __str__() method that identifies the
# name of the entry that caused the exception.
raise EntryProxyAttributeError(self, name)
return attr
else:
return attr_function(self)
class Base(SCons.Node.Node):
"""A generic class for file system entries. This class is for
when we don't know yet whether the entry being looked up is a file
or a directory. Instances of this class can morph into either
Dir or File objects by a later, more precise lookup.
Note: this class does not define __cmp__ and __hash__ for
efficiency reasons. SCons does a lot of comparing of
Node.FS.{Base,Entry,File,Dir} objects, so those operations must be
as fast as possible, which means we want to use Python's built-in
object identity comparisons.
"""
memoizer_counters = []
def __init__(self, name, directory, fs):
"""Initialize a generic Node.FS.Base object.
Call the superclass initialization, take care of setting up
our relative and absolute paths, identify our parent
directory, and indicate that this node should use
signatures."""
if __debug__: logInstanceCreation(self, 'Node.FS.Base')
SCons.Node.Node.__init__(self)
# Filenames and paths are probably reused and are intern'ed to
# save some memory.
self.name = SCons.Util.silent_intern(name)
self.suffix = SCons.Util.silent_intern(SCons.Util.splitext(name)[1])
self.fs = fs
assert directory, "A directory must be provided"
self.abspath = SCons.Util.silent_intern(directory.entry_abspath(name))
self.labspath = SCons.Util.silent_intern(directory.entry_labspath(name))
if directory.path == '.':
self.path = SCons.Util.silent_intern(name)
else:
self.path = SCons.Util.silent_intern(directory.entry_path(name))
if directory.tpath == '.':
self.tpath = SCons.Util.silent_intern(name)
else:
self.tpath = SCons.Util.silent_intern(directory.entry_tpath(name))
self.path_elements = directory.path_elements + [self]
self.dir = directory
self.cwd = None # will hold the SConscript directory for target nodes
self.duplicate = directory.duplicate
def str_for_display(self):
return '"' + self.__str__() + '"'
def must_be_same(self, klass):
"""
This node, which already existed, is being looked up as the
specified klass. Raise an exception if it isn't.
"""
if isinstance(self, klass) or klass is Entry:
return
raise TypeError("Tried to lookup %s '%s' as a %s." %\
(self.__class__.__name__, self.path, klass.__name__))
def get_dir(self):
return self.dir
def get_suffix(self):
return self.suffix
def rfile(self):
return self
def __str__(self):
"""A Node.FS.Base object's string representation is its path
name."""
global Save_Strings
if Save_Strings:
return self._save_str()
return self._get_str()
memoizer_counters.append(SCons.Memoize.CountValue('_save_str'))
def _save_str(self):
try:
return self._memo['_save_str']
except KeyError:
pass
result = sys.intern(self._get_str())
self._memo['_save_str'] = result
return result
def _get_str(self):
global Save_Strings
if self.duplicate or self.is_derived():
return self.get_path()
srcnode = self.srcnode()
if srcnode.stat() is None and self.stat() is not None:
result = self.get_path()
else:
result = srcnode.get_path()
if not Save_Strings:
# We're not at the point where we're saving the string string
# representations of FS Nodes (because we haven't finished
# reading the SConscript files and need to have str() return
# things relative to them). That also means we can't yet
# cache values returned (or not returned) by stat(), since
# Python code in the SConscript files might still create
# or otherwise affect the on-disk file. So get rid of the
# values that the underlying stat() method saved.
try: del self._memo['stat']
except KeyError: pass
if self is not srcnode:
try: del srcnode._memo['stat']
except KeyError: pass
return result
rstr = __str__
memoizer_counters.append(SCons.Memoize.CountValue('stat'))
def stat(self):
try: return self._memo['stat']
except KeyError: pass
try: result = self.fs.stat(self.abspath)
except os.error: result = None
self._memo['stat'] = result
return result
def exists(self):
return self.stat() is not None
def rexists(self):
return self.rfile().exists()
def getmtime(self):
st = self.stat()
if st: return st[stat.ST_MTIME]
else: return None
def getsize(self):
st = self.stat()
if st: return st[stat.ST_SIZE]
else: return None
def isdir(self):
st = self.stat()
return st is not None and stat.S_ISDIR(st[stat.ST_MODE])
def isfile(self):
st = self.stat()
return st is not None and stat.S_ISREG(st[stat.ST_MODE])
if hasattr(os, 'symlink'):
def islink(self):
try: st = self.fs.lstat(self.abspath)
except os.error: return 0
return stat.S_ISLNK(st[stat.ST_MODE])
else:
def islink(self):
return 0 # no symlinks
def is_under(self, dir):
if self is dir:
return 1
else:
return self.dir.is_under(dir)
def set_local(self):
self._local = 1
def srcnode(self):
"""If this node is in a build path, return the node
corresponding to its source file. Otherwise, return
ourself.
"""
srcdir_list = self.dir.srcdir_list()
if srcdir_list:
srcnode = srcdir_list[0].Entry(self.name)
srcnode.must_be_same(self.__class__)
return srcnode
return self
def get_path(self, dir=None):
"""Return path relative to the current working directory of the
Node.FS.Base object that owns us."""
if not dir:
dir = self.fs.getcwd()
if self == dir:
return '.'
path_elems = self.path_elements
try: i = path_elems.index(dir)
except ValueError: pass
else: path_elems = path_elems[i+1:]
path_elems = [n.name for n in path_elems]
return os.sep.join(path_elems)
def set_src_builder(self, builder):
"""Set the source code builder for this node."""
self.sbuilder = builder
if not self.has_builder():
self.builder_set(builder)
def src_builder(self):
"""Fetch the source code builder for this node.
If there isn't one, we cache the source code builder specified
for the directory (which in turn will cache the value from its
parent directory, and so on up to the file system root).
"""
try:
scb = self.sbuilder
except AttributeError:
scb = self.dir.src_builder()
self.sbuilder = scb
return scb
def get_abspath(self):
"""Get the absolute path of the file."""
return self.abspath
def for_signature(self):
# Return just our name. Even an absolute path would not work,
# because that can change thanks to symlinks or remapped network
# paths.
return self.name
def get_subst_proxy(self):
try:
return self._proxy
except AttributeError:
ret = EntryProxy(self)
self._proxy = ret
return ret
def target_from_source(self, prefix, suffix, splitext=SCons.Util.splitext):
"""
Generates a target entry that corresponds to this entry (usually
a source file) with the specified prefix and suffix.
Note that this method can be overridden dynamically for generated
files that need different behavior. See Tool/swig.py for
an example.
"""
return self.dir.Entry(prefix + splitext(self.name)[0] + suffix)
def _Rfindalldirs_key(self, pathlist):
return pathlist
memoizer_counters.append(SCons.Memoize.CountDict('Rfindalldirs', _Rfindalldirs_key))
def Rfindalldirs(self, pathlist):
"""
Return all of the directories for a given path list, including
corresponding "backing" directories in any repositories.
The Node lookups are relative to this Node (typically a
directory), so memoizing result saves cycles from looking
up the same path for each target in a given directory.
"""
try:
memo_dict = self._memo['Rfindalldirs']
except KeyError:
memo_dict = {}
self._memo['Rfindalldirs'] = memo_dict
else:
try:
return memo_dict[pathlist]
except KeyError:
pass
create_dir_relative_to_self = self.Dir
result = []
for path in pathlist:
if isinstance(path, SCons.Node.Node):
result.append(path)
else:
dir = create_dir_relative_to_self(path)
result.extend(dir.get_all_rdirs())
memo_dict[pathlist] = result
return result
def RDirs(self, pathlist):
"""Search for a list of directories in the Repository list."""
cwd = self.cwd or self.fs._cwd
return cwd.Rfindalldirs(pathlist)
memoizer_counters.append(SCons.Memoize.CountValue('rentry'))
def rentry(self):
try:
return self._memo['rentry']
except KeyError:
pass
result = self
if not self.exists():
norm_name = _my_normcase(self.name)
for dir in self.dir.get_all_rdirs():
try:
node = dir.entries[norm_name]
except KeyError:
if dir.entry_exists_on_disk(self.name):
result = dir.Entry(self.name)
break
self._memo['rentry'] = result
return result
def _glob1(self, pattern, ondisk=True, source=False, strings=False):
return []
class Entry(Base):
"""This is the class for generic Node.FS entries--that is, things
that could be a File or a Dir, but we're just not sure yet.
Consequently, the methods in this class really exist just to
transform their associated object into the right class when the
time comes, and then call the same-named method in the transformed
class."""
def diskcheck_match(self):
pass
def disambiguate(self, must_exist=None):
"""
"""
if self.isdir():
self.__class__ = Dir
self._morph()
elif self.isfile():
self.__class__ = File
self._morph()
self.clear()
else:
# There was nothing on-disk at this location, so look in
# the src directory.
#
# We can't just use self.srcnode() straight away because
# that would create an actual Node for this file in the src
# directory, and there might not be one. Instead, use the
# dir_on_disk() method to see if there's something on-disk
# with that name, in which case we can go ahead and call
# self.srcnode() to create the right type of entry.
srcdir = self.dir.srcnode()
if srcdir != self.dir and \
srcdir.entry_exists_on_disk(self.name) and \
self.srcnode().isdir():
self.__class__ = Dir
self._morph()
elif must_exist:
msg = "No such file or directory: '%s'" % self.abspath
raise SCons.Errors.UserError(msg)
else:
self.__class__ = File
self._morph()
self.clear()
return self
def rfile(self):
"""We're a generic Entry, but the caller is actually looking for
a File at this point, so morph into one."""
self.__class__ = File
self._morph()
self.clear()
return File.rfile(self)
def scanner_key(self):
return self.get_suffix()
def get_contents(self):
"""Fetch the contents of the entry. Returns the exact binary
contents of the file."""
try:
self = self.disambiguate(must_exist=1)
except SCons.Errors.UserError:
# There was nothing on disk with which to disambiguate
# this entry. Leave it as an Entry, but return a null
# string so calls to get_contents() in emitters and the
# like (e.g. in qt.py) don't have to disambiguate by hand
# or catch the exception.
return ''
else:
return self.get_contents()
def get_text_contents(self):
"""Fetch the decoded text contents of a Unicode encoded Entry.
Since this should return the text contents from the file
system, we check to see into what sort of subclass we should
morph this Entry."""
try:
self = self.disambiguate(must_exist=1)
except SCons.Errors.UserError:
# There was nothing on disk with which to disambiguate
# this entry. Leave it as an Entry, but return a null
# string so calls to get_text_contents() in emitters and
# the like (e.g. in qt.py) don't have to disambiguate by
# hand or catch the exception.
return ''
else:
return self.get_text_contents()
def must_be_same(self, klass):
"""Called to make sure a Node is a Dir. Since we're an
Entry, we can morph into one."""
if self.__class__ is not klass:
self.__class__ = klass
self._morph()
self.clear()
# The following methods can get called before the Taskmaster has
# had a chance to call disambiguate() directly to see if this Entry
# should really be a Dir or a File. We therefore use these to call
# disambiguate() transparently (from our caller's point of view).
#
# Right now, this minimal set of methods has been derived by just
# looking at some of the methods that will obviously be called early
# in any of the various Taskmasters' calling sequences, and then
# empirically figuring out which additional methods are necessary
# to make various tests pass.
def exists(self):
"""Return if the Entry exists. Check the file system to see
what we should turn into first. Assume a file if there's no
directory."""
return self.disambiguate().exists()
def rel_path(self, other):
d = self.disambiguate()
if d.__class__ is Entry:
raise Exception("rel_path() could not disambiguate File/Dir")
return d.rel_path(other)
def new_ninfo(self):
return self.disambiguate().new_ninfo()
def changed_since_last_build(self, target, prev_ni):
return self.disambiguate().changed_since_last_build(target, prev_ni)
def _glob1(self, pattern, ondisk=True, source=False, strings=False):
return self.disambiguate()._glob1(pattern, ondisk, source, strings)
def get_subst_proxy(self):
return self.disambiguate().get_subst_proxy()
# This is for later so we can differentiate between Entry the class and Entry
# the method of the FS class.
_classEntry = Entry
class LocalFS(object):
if SCons.Memoize.use_memoizer:
__metaclass__ = SCons.Memoize.Memoized_Metaclass
# This class implements an abstraction layer for operations involving
# a local file system. Essentially, this wraps any function in
# the os, os.path or shutil modules that we use to actually go do
# anything with or to the local file system.
#
# Note that there's a very good chance we'll refactor this part of
# the architecture in some way as we really implement the interface(s)
# for remote file system Nodes. For example, the right architecture
# might be to have this be a subclass instead of a base class.
# Nevertheless, we're using this as a first step in that direction.
#
# We're not using chdir() yet because the calling subclass method
# needs to use os.chdir() directly to avoid recursion. Will we
# really need this one?
#def chdir(self, path):
# return os.chdir(path)
def chmod(self, path, mode):
return os.chmod(path, mode)
def copy(self, src, dst):
return shutil.copy(src, dst)
def copy2(self, src, dst):
return shutil.copy2(src, dst)
def exists(self, path):
return os.path.exists(path)
def getmtime(self, path):
return os.path.getmtime(path)
def getsize(self, path):
return os.path.getsize(path)
def isdir(self, path):
return os.path.isdir(path)
def isfile(self, path):
return os.path.isfile(path)
def link(self, src, dst):
return os.link(src, dst)
def lstat(self, path):
return os.lstat(path)
def listdir(self, path):
return os.listdir(path)
def makedirs(self, path):
return os.makedirs(path)
def mkdir(self, path):
return os.mkdir(path)
def rename(self, old, new):
return os.rename(old, new)
def stat(self, path):
return os.stat(path)
def symlink(self, src, dst):
return os.symlink(src, dst)
def open(self, path):
return open(path)
def unlink(self, path):
return os.unlink(path)
if hasattr(os, 'symlink'):
def islink(self, path):
return os.path.islink(path)
else:
def islink(self, path):
return 0 # no symlinks
if hasattr(os, 'readlink'):
def readlink(self, file):
return os.readlink(file)
else:
def readlink(self, file):
return ''
#class RemoteFS:
# # Skeleton for the obvious methods we might need from the
# # abstraction layer for a remote filesystem.
# def upload(self, local_src, remote_dst):
# pass
# def download(self, remote_src, local_dst):
# pass
class FS(LocalFS):
memoizer_counters = []
def __init__(self, path = None):
"""Initialize the Node.FS subsystem.
The supplied path is the top of the source tree, where we
expect to find the top-level build file. If no path is
supplied, the current directory is the default.
The path argument must be a valid absolute path.
"""
if __debug__: logInstanceCreation(self, 'Node.FS')
self._memo = {}
self.Root = {}
self.SConstruct_dir = None
self.max_drift = default_max_drift
self.Top = None
if path is None:
self.pathTop = os.getcwd()
else:
self.pathTop = path
self.defaultDrive = _my_normcase(os.path.splitdrive(self.pathTop)[0])
self.Top = self.Dir(self.pathTop)
self.Top.path = '.'
self.Top.tpath = '.'
self._cwd = self.Top
DirNodeInfo.fs = self
FileNodeInfo.fs = self
def set_SConstruct_dir(self, dir):
self.SConstruct_dir = dir
def get_max_drift(self):
return self.max_drift
def set_max_drift(self, max_drift):
self.max_drift = max_drift
def getcwd(self):
return self._cwd
def chdir(self, dir, change_os_dir=0):
"""Change the current working directory for lookups.
If change_os_dir is true, we will also change the "real" cwd
to match.
"""
curr=self._cwd
try:
if dir is not None:
self._cwd = dir
if change_os_dir:
os.chdir(dir.abspath)
except OSError:
self._cwd = curr
raise
def get_root(self, drive):
"""
Returns the root directory for the specified drive, creating
it if necessary.
"""
drive = _my_normcase(drive)
try:
return self.Root[drive]
except KeyError:
root = RootDir(drive, self)
self.Root[drive] = root
if not drive:
self.Root[self.defaultDrive] = root
elif drive == self.defaultDrive:
self.Root[''] = root
return root
def _lookup(self, p, directory, fsclass, create=1):
"""
The generic entry point for Node lookup with user-supplied data.
This translates arbitrary input into a canonical Node.FS object
of the specified fsclass. The general approach for strings is
to turn it into a fully normalized absolute path and then call
the root directory's lookup_abs() method for the heavy lifting.
If the path name begins with '#', it is unconditionally
interpreted relative to the top-level directory of this FS. '#'
is treated as a synonym for the top-level SConstruct directory,
much like '~' is treated as a synonym for the user's home
directory in a UNIX shell. So both '#foo' and '#/foo' refer
to the 'foo' subdirectory underneath the top-level SConstruct
directory.
If the path name is relative, then the path is looked up relative
to the specified directory, or the current directory (self._cwd,
typically the SConscript directory) if the specified directory
is None.
"""
if isinstance(p, Base):
# It's already a Node.FS object. Make sure it's the right
# class and return.
p.must_be_same(fsclass)
return p
# str(p) in case it's something like a proxy object
p = str(p)
initial_hash = (p[0:1] == '#')
if initial_hash:
# There was an initial '#', so we strip it and override
# whatever directory they may have specified with the
# top-level SConstruct directory.
p = p[1:]
directory = self.Top
if directory and not isinstance(directory, Dir):
directory = self.Dir(directory)
if do_splitdrive:
drive, p = os.path.splitdrive(p)
else:
drive = ''
if drive and not p:
# This causes a naked drive letter to be treated as a synonym
# for the root directory on that drive.
p = os.sep
absolute = os.path.isabs(p)
needs_normpath = needs_normpath_check.match(p)
if initial_hash or not absolute:
# This is a relative lookup, either to the top-level
# SConstruct directory (because of the initial '#') or to
# the current directory (the path name is not absolute).
# Add the string to the appropriate directory lookup path,
# after which the whole thing gets normalized.
if not directory:
directory = self._cwd
if p:
p = directory.labspath + '/' + p
else:
p = directory.labspath
if needs_normpath:
p = os.path.normpath(p)
if drive or absolute:
root = self.get_root(drive)
else:
if not directory:
directory = self._cwd
root = directory.root
if os.sep != '/':
p = p.replace(os.sep, '/')
return root._lookup_abs(p, fsclass, create)
def Entry(self, name, directory = None, create = 1):
"""Look up or create a generic Entry node with the specified name.
If the name is a relative path (begins with ./, ../, or a file
name), then it is looked up relative to the supplied directory
node, or to the top level directory of the FS (supplied at
construction time) if no directory is supplied.
"""
return self._lookup(name, directory, Entry, create)
def File(self, name, directory = None, create = 1):
"""Look up or create a File node with the specified name. If
the name is a relative path (begins with ./, ../, or a file name),
then it is looked up relative to the supplied directory node,
or to the top level directory of the FS (supplied at construction
time) if no directory is supplied.
This method will raise TypeError if a directory is found at the
specified path.
"""
return self._lookup(name, directory, File, create)
def Dir(self, name, directory = None, create = True):
"""Look up or create a Dir node with the specified name. If
the name is a relative path (begins with ./, ../, or a file name),
then it is looked up relative to the supplied directory node,
or to the top level directory of the FS (supplied at construction
time) if no directory is supplied.
This method will raise TypeError if a normal file is found at the
specified path.
"""
return self._lookup(name, directory, Dir, create)
def VariantDir(self, variant_dir, src_dir, duplicate=1):
"""Link the supplied variant directory to the source directory
for purposes of building files."""
if not isinstance(src_dir, SCons.Node.Node):
src_dir = self.Dir(src_dir)
if not isinstance(variant_dir, SCons.Node.Node):
variant_dir = self.Dir(variant_dir)
if src_dir.is_under(variant_dir):
raise SCons.Errors.UserError("Source directory cannot be under variant directory.")
if variant_dir.srcdir:
if variant_dir.srcdir == src_dir:
return # We already did this.
raise SCons.Errors.UserError("'%s' already has a source directory: '%s'."%(variant_dir, variant_dir.srcdir))
variant_dir.link(src_dir, duplicate)
def Repository(self, *dirs):
"""Specify Repository directories to search."""
for d in dirs:
if not isinstance(d, SCons.Node.Node):
d = self.Dir(d)
self.Top.addRepository(d)
def variant_dir_target_climb(self, orig, dir, tail):
"""Create targets in corresponding variant directories
Climb the directory tree, and look up path names
relative to any linked variant directories we find.
Even though this loops and walks up the tree, we don't memoize
the return value because this is really only used to process
the command-line targets.
"""
targets = []
message = None
fmt = "building associated VariantDir targets: %s"
start_dir = dir
while dir:
for bd in dir.variant_dirs:
if start_dir.is_under(bd):
# If already in the build-dir location, don't reflect
return [orig], fmt % str(orig)
p = os.path.join(bd.path, *tail)
targets.append(self.Entry(p))
tail = [dir.name] + tail
dir = dir.up()
if targets:
message = fmt % ' '.join(map(str, targets))
return targets, message
def Glob(self, pathname, ondisk=True, source=True, strings=False, cwd=None):
"""
Globs
This is mainly a shim layer
"""
if cwd is None:
cwd = self.getcwd()
return cwd.glob(pathname, ondisk, source, strings)
class DirNodeInfo(SCons.Node.NodeInfoBase):
# This should get reset by the FS initialization.
current_version_id = 1
fs = None
def str_to_node(self, s):
top = self.fs.Top
root = top.root
if do_splitdrive:
drive, s = os.path.splitdrive(s)
if drive:
root = self.fs.get_root(drive)
if not os.path.isabs(s):
s = top.labspath + '/' + s
return root._lookup_abs(s, Entry)
class DirBuildInfo(SCons.Node.BuildInfoBase):
current_version_id = 1
glob_magic_check = re.compile('[*?[]')
def has_glob_magic(s):
return glob_magic_check.search(s) is not None
class Dir(Base):
"""A class for directories in a file system.
"""
memoizer_counters = []
NodeInfo = DirNodeInfo
BuildInfo = DirBuildInfo
def __init__(self, name, directory, fs):
if __debug__: logInstanceCreation(self, 'Node.FS.Dir')
Base.__init__(self, name, directory, fs)
self._morph()
def _morph(self):
"""Turn a file system Node (either a freshly initialized directory
object or a separate Entry object) into a proper directory object.
Set up this directory's entries and hook it into the file
system tree. Specify that directories (this Node) don't use
signatures for calculating whether they're current.
"""
self.repositories = []
self.srcdir = None
self.entries = {}
self.entries['.'] = self
self.entries['..'] = self.dir
self.cwd = self
self.searched = 0
self._sconsign = None
self.variant_dirs = []
self.root = self.dir.root
# Don't just reset the executor, replace its action list,
# because it might have some pre-or post-actions that need to
# be preserved.
self.builder = get_MkdirBuilder()
self.get_executor().set_action_list(self.builder.action)
def diskcheck_match(self):
diskcheck_match(self, self.isfile,
"File %s found where directory expected.")
def __clearRepositoryCache(self, duplicate=None):
"""Called when we change the repository(ies) for a directory.
This clears any cached information that is invalidated by changing
the repository."""
for node in self.entries.values():
if node != self.dir:
if node != self and isinstance(node, Dir):
node.__clearRepositoryCache(duplicate)
else:
node.clear()
try:
del node._srcreps
except AttributeError:
pass
if duplicate is not None:
node.duplicate=duplicate
def __resetDuplicate(self, node):
if node != self:
node.duplicate = node.get_dir().duplicate
def Entry(self, name):
"""
Looks up or creates an entry node named 'name' relative to
this directory.
"""
return self.fs.Entry(name, self)
def Dir(self, name, create=True):
"""
Looks up or creates a directory node named 'name' relative to
this directory.
"""
return self.fs.Dir(name, self, create)
def File(self, name):
"""
Looks up or creates a file node named 'name' relative to
this directory.
"""
return self.fs.File(name, self)
def _lookup_rel(self, name, klass, create=1):
"""
Looks up a *normalized* relative path name, relative to this
directory.
This method is intended for use by internal lookups with
already-normalized path data. For general-purpose lookups,
use the Entry(), Dir() and File() methods above.
This method does *no* input checking and will die or give
incorrect results if it's passed a non-normalized path name (e.g.,
a path containing '..'), an absolute path name, a top-relative
('#foo') path name, or any kind of object.
"""
name = self.entry_labspath(name)
return self.root._lookup_abs(name, klass, create)
def link(self, srcdir, duplicate):
"""Set this directory as the variant directory for the
supplied source directory."""
self.srcdir = srcdir
self.duplicate = duplicate
self.__clearRepositoryCache(duplicate)
srcdir.variant_dirs.append(self)
def getRepositories(self):
"""Returns a list of repositories for this directory.
"""
if self.srcdir and not self.duplicate:
return self.srcdir.get_all_rdirs() + self.repositories
return self.repositories
memoizer_counters.append(SCons.Memoize.CountValue('get_all_rdirs'))
def get_all_rdirs(self):
try:
return list(self._memo['get_all_rdirs'])
except KeyError:
pass
result = [self]
fname = '.'
dir = self
while dir:
for rep in dir.getRepositories():
result.append(rep.Dir(fname))
if fname == '.':
fname = dir.name
else:
fname = dir.name + os.sep + fname
dir = dir.up()
self._memo['get_all_rdirs'] = list(result)
return result
def addRepository(self, dir):
if dir != self and not dir in self.repositories:
self.repositories.append(dir)
dir.tpath = '.'
self.__clearRepositoryCache()
def up(self):
return self.entries['..']
def _rel_path_key(self, other):
return str(other)
memoizer_counters.append(SCons.Memoize.CountDict('rel_path', _rel_path_key))
def rel_path(self, other):
"""Return a path to "other" relative to this directory.
"""
# This complicated and expensive method, which constructs relative
# paths between arbitrary Node.FS objects, is no longer used
# by SCons itself. It was introduced to store dependency paths
# in .sconsign files relative to the target, but that ended up
# being significantly inefficient.
#
# We're continuing to support the method because some SConstruct
# files out there started using it when it was available, and
# we're all about backwards compatibility..
try:
memo_dict = self._memo['rel_path']
except KeyError:
memo_dict = {}
self._memo['rel_path'] = memo_dict
else:
try:
return memo_dict[other]
except KeyError:
pass
if self is other:
result = '.'
elif not other in self.path_elements:
try:
other_dir = other.get_dir()
except AttributeError:
result = str(other)
else:
if other_dir is None:
result = other.name
else:
dir_rel_path = self.rel_path(other_dir)
if dir_rel_path == '.':
result = other.name
else:
result = dir_rel_path + os.sep + other.name
else:
i = self.path_elements.index(other) + 1
path_elems = ['..'] * (len(self.path_elements) - i) \
+ [n.name for n in other.path_elements[i:]]
result = os.sep.join(path_elems)
memo_dict[other] = result
return result
def get_env_scanner(self, env, kw={}):
import SCons.Defaults
return SCons.Defaults.DirEntryScanner
def get_target_scanner(self):
import SCons.Defaults
return SCons.Defaults.DirEntryScanner
def get_found_includes(self, env, scanner, path):
"""Return this directory's implicit dependencies.
We don't bother caching the results because the scan typically
shouldn't be requested more than once (as opposed to scanning
.h file contents, which can be requested as many times as the
files is #included by other files).
"""
if not scanner:
return []
# Clear cached info for this Dir. If we already visited this
# directory on our walk down the tree (because we didn't know at
# that point it was being used as the source for another Node)
# then we may have calculated build signature before realizing
# we had to scan the disk. Now that we have to, though, we need
# to invalidate the old calculated signature so that any node
# dependent on our directory structure gets one that includes
# info about everything on disk.
self.clear()
return scanner(self, env, path)
#
# Taskmaster interface subsystem
#
def prepare(self):
pass
def build(self, **kw):
"""A null "builder" for directories."""
global MkdirBuilder
if self.builder is not MkdirBuilder:
SCons.Node.Node.build(self, **kw)
#
#
#
def _create(self):
"""Create this directory, silently and without worrying about
whether the builder is the default or not."""
listDirs = []
parent = self
while parent:
if parent.exists():
break
listDirs.append(parent)
p = parent.up()
if p is None:
# Don't use while: - else: for this condition because
# if so, then parent is None and has no .path attribute.
raise SCons.Errors.StopError(parent.path)
parent = p
listDirs.reverse()
for dirnode in listDirs:
try:
# Don't call dirnode.build(), call the base Node method
# directly because we definitely *must* create this
# directory. The dirnode.build() method will suppress
# the build if it's the default builder.
SCons.Node.Node.build(dirnode)
dirnode.get_executor().nullify()
# The build() action may or may not have actually
# created the directory, depending on whether the -n
# option was used or not. Delete the _exists and
# _rexists attributes so they can be reevaluated.
dirnode.clear()
except OSError:
pass
def multiple_side_effect_has_builder(self):
global MkdirBuilder
return self.builder is not MkdirBuilder and self.has_builder()
def alter_targets(self):
"""Return any corresponding targets in a variant directory.
"""
return self.fs.variant_dir_target_climb(self, self, [])
def scanner_key(self):
"""A directory does not get scanned."""
return None
def get_text_contents(self):
"""We already emit things in text, so just return the binary
version."""
return self.get_contents()
def get_contents(self):
"""Return content signatures and names of all our children
separated by new-lines. Ensure that the nodes are sorted."""
contents = []
for node in sorted(self.children(), key=lambda t: t.name):
contents.append('%s %s\n' % (node.get_csig(), node.name))
return ''.join(contents)
def get_csig(self):
"""Compute the content signature for Directory nodes. In
general, this is not needed and the content signature is not
stored in the DirNodeInfo. However, if get_contents on a Dir
node is called which has a child directory, the child
directory should return the hash of its contents."""
contents = self.get_contents()
return SCons.Util.MD5signature(contents)
def do_duplicate(self, src):
pass
changed_since_last_build = SCons.Node.Node.state_has_changed
def is_up_to_date(self):
"""If any child is not up-to-date, then this directory isn't,
either."""
if self.builder is not MkdirBuilder and not self.exists():
return 0
up_to_date = SCons.Node.up_to_date
for kid in self.children():
if kid.get_state() > up_to_date:
return 0
return 1
def rdir(self):
if not self.exists():
norm_name = _my_normcase(self.name)
for dir in self.dir.get_all_rdirs():
try: node = dir.entries[norm_name]
except KeyError: node = dir.dir_on_disk(self.name)
if node and node.exists() and \
(isinstance(dir, Dir) or isinstance(dir, Entry)):
return node
return self
def sconsign(self):
"""Return the .sconsign file info for this directory,
creating it first if necessary."""
if not self._sconsign:
import SCons.SConsign
self._sconsign = SCons.SConsign.ForDirectory(self)
return self._sconsign
def srcnode(self):
"""Dir has a special need for srcnode()...if we
have a srcdir attribute set, then that *is* our srcnode."""
if self.srcdir:
return self.srcdir
return Base.srcnode(self)
def get_timestamp(self):
"""Return the latest timestamp from among our children"""
stamp = 0
for kid in self.children():
if kid.get_timestamp() > stamp:
stamp = kid.get_timestamp()
return stamp
def entry_abspath(self, name):
return self.abspath + os.sep + name
def entry_labspath(self, name):
return self.labspath + '/' + name
def entry_path(self, name):
return self.path + os.sep + name
def entry_tpath(self, name):
return self.tpath + os.sep + name
def entry_exists_on_disk(self, name):
try:
d = self.on_disk_entries
except AttributeError:
d = {}
try:
entries = os.listdir(self.abspath)
except OSError:
pass
else:
for entry in map(_my_normcase, entries):
d[entry] = True
self.on_disk_entries = d
if sys.platform == 'win32':
name = _my_normcase(name)
result = d.get(name)
if result is None:
# Belt-and-suspenders for Windows: check directly for
# 8.3 file names that don't show up in os.listdir().
result = os.path.exists(self.abspath + os.sep + name)
d[name] = result
return result
else:
return name in d
memoizer_counters.append(SCons.Memoize.CountValue('srcdir_list'))
def srcdir_list(self):
try:
return self._memo['srcdir_list']
except KeyError:
pass
result = []
dirname = '.'
dir = self
while dir:
if dir.srcdir:
result.append(dir.srcdir.Dir(dirname))
dirname = dir.name + os.sep + dirname
dir = dir.up()
self._memo['srcdir_list'] = result
return result
def srcdir_duplicate(self, name):
for dir in self.srcdir_list():
if self.is_under(dir):
# We shouldn't source from something in the build path;
# variant_dir is probably under src_dir, in which case
# we are reflecting.
break
if dir.entry_exists_on_disk(name):
srcnode = dir.Entry(name).disambiguate()
if self.duplicate:
node = self.Entry(name).disambiguate()
node.do_duplicate(srcnode)
return node
else:
return srcnode
return None
def _srcdir_find_file_key(self, filename):
return filename
memoizer_counters.append(SCons.Memoize.CountDict('srcdir_find_file', _srcdir_find_file_key))
def srcdir_find_file(self, filename):
try:
memo_dict = self._memo['srcdir_find_file']
except KeyError:
memo_dict = {}
self._memo['srcdir_find_file'] = memo_dict
else:
try:
return memo_dict[filename]
except KeyError:
pass
def func(node):
if (isinstance(node, File) or isinstance(node, Entry)) and \
(node.is_derived() or node.exists()):
return node
return None
norm_name = _my_normcase(filename)
for rdir in self.get_all_rdirs():
try: node = rdir.entries[norm_name]
except KeyError: node = rdir.file_on_disk(filename)
else: node = func(node)
if node:
result = (node, self)
memo_dict[filename] = result
return result
for srcdir in self.srcdir_list():
for rdir in srcdir.get_all_rdirs():
try: node = rdir.entries[norm_name]
except KeyError: node = rdir.file_on_disk(filename)
else: node = func(node)
if node:
result = (File(filename, self, self.fs), srcdir)
memo_dict[filename] = result
return result
result = (None, None)
memo_dict[filename] = result
return result
def dir_on_disk(self, name):
if self.entry_exists_on_disk(name):
try: return self.Dir(name)
except TypeError: pass
node = self.srcdir_duplicate(name)
if isinstance(node, File):
return None
return node
def file_on_disk(self, name):
if self.entry_exists_on_disk(name) or \
diskcheck_rcs(self, name) or \
diskcheck_sccs(self, name):
try: return self.File(name)
except TypeError: pass
node = self.srcdir_duplicate(name)
if isinstance(node, Dir):
return None
return node
def walk(self, func, arg):
"""
Walk this directory tree by calling the specified function
for each directory in the tree.
This behaves like the os.path.walk() function, but for in-memory
Node.FS.Dir objects. The function takes the same arguments as
the functions passed to os.path.walk():
func(arg, dirname, fnames)
Except that "dirname" will actually be the directory *Node*,
not the string. The '.' and '..' entries are excluded from
fnames. The fnames list may be modified in-place to filter the
subdirectories visited or otherwise impose a specific order.
The "arg" argument is always passed to func() and may be used
in any way (or ignored, passing None is common).
"""
entries = self.entries
names = list(entries.keys())
names.remove('.')
names.remove('..')
func(arg, self, names)
for dirname in [n for n in names if isinstance(entries[n], Dir)]:
entries[dirname].walk(func, arg)
def glob(self, pathname, ondisk=True, source=False, strings=False):
"""
Returns a list of Nodes (or strings) matching a specified
pathname pattern.
Pathname patterns follow UNIX shell semantics: * matches
any-length strings of any characters, ? matches any character,
and [] can enclose lists or ranges of characters. Matches do
not span directory separators.
The matches take into account Repositories, returning local
Nodes if a corresponding entry exists in a Repository (either
an in-memory Node or something on disk).
By defafult, the glob() function matches entries that exist
on-disk, in addition to in-memory Nodes. Setting the "ondisk"
argument to False (or some other non-true value) causes the glob()
function to only match in-memory Nodes. The default behavior is
to return both the on-disk and in-memory Nodes.
The "source" argument, when true, specifies that corresponding
source Nodes must be returned if you're globbing in a build
directory (initialized with VariantDir()). The default behavior
is to return Nodes local to the VariantDir().
The "strings" argument, when true, returns the matches as strings,
not Nodes. The strings are path names relative to this directory.
The underlying algorithm is adapted from the glob.glob() function
in the Python library (but heavily modified), and uses fnmatch()
under the covers.
"""
dirname, basename = os.path.split(pathname)
if not dirname:
return sorted(self._glob1(basename, ondisk, source, strings),
key=lambda t: str(t))
if has_glob_magic(dirname):
list = self.glob(dirname, ondisk, source, strings=False)
else:
list = [self.Dir(dirname, create=True)]
result = []
for dir in list:
r = dir._glob1(basename, ondisk, source, strings)
if strings:
r = [os.path.join(str(dir), x) for x in r]
result.extend(r)
return sorted(result, key=lambda a: str(a))
def _glob1(self, pattern, ondisk=True, source=False, strings=False):
"""
Globs for and returns a list of entry names matching a single
pattern in this directory.
This searches any repositories and source directories for
corresponding entries and returns a Node (or string) relative
to the current directory if an entry is found anywhere.
TODO: handle pattern with no wildcard
"""
search_dir_list = self.get_all_rdirs()
for srcdir in self.srcdir_list():
search_dir_list.extend(srcdir.get_all_rdirs())
selfEntry = self.Entry
names = []
for dir in search_dir_list:
# We use the .name attribute from the Node because the keys of
# the dir.entries dictionary are normalized (that is, all upper
# case) on case-insensitive systems like Windows.
node_names = [ v.name for k, v in dir.entries.items()
if k not in ('.', '..') ]
names.extend(node_names)
if not strings:
# Make sure the working directory (self) actually has
# entries for all Nodes in repositories or variant dirs.
for name in node_names: selfEntry(name)
if ondisk:
try:
disk_names = os.listdir(dir.abspath)
except os.error:
continue
names.extend(disk_names)
if not strings:
# We're going to return corresponding Nodes in
# the local directory, so we need to make sure
# those Nodes exist. We only want to create
# Nodes for the entries that will match the
# specified pattern, though, which means we
# need to filter the list here, even though
# the overall list will also be filtered later,
# after we exit this loop.
if pattern[0] != '.':
#disk_names = [ d for d in disk_names if d[0] != '.' ]
disk_names = [x for x in disk_names if x[0] != '.']
disk_names = fnmatch.filter(disk_names, pattern)
dirEntry = dir.Entry
for name in disk_names:
# Add './' before disk filename so that '#' at
# beginning of filename isn't interpreted.
name = './' + name
node = dirEntry(name).disambiguate()
n = selfEntry(name)
if n.__class__ != node.__class__:
n.__class__ = node.__class__
n._morph()
names = set(names)
if pattern[0] != '.':
#names = [ n for n in names if n[0] != '.' ]
names = [x for x in names if x[0] != '.']
names = fnmatch.filter(names, pattern)
if strings:
return names
#return [ self.entries[_my_normcase(n)] for n in names ]
return [self.entries[_my_normcase(n)] for n in names]
class RootDir(Dir):
"""A class for the root directory of a file system.
This is the same as a Dir class, except that the path separator
('/' or '\\') is actually part of the name, so we don't need to
add a separator when creating the path names of entries within
this directory.
"""
def __init__(self, name, fs):
if __debug__: logInstanceCreation(self, 'Node.FS.RootDir')
# We're going to be our own parent directory (".." entry and .dir
# attribute) so we have to set up some values so Base.__init__()
# won't gag won't it calls some of our methods.
self.abspath = ''
self.labspath = ''
self.path = ''
self.tpath = ''
self.path_elements = []
self.duplicate = 0
self.root = self
Base.__init__(self, name, self, fs)
# Now set our paths to what we really want them to be: the
# initial drive letter (the name) plus the directory separator,
# except for the "lookup abspath," which does not have the
# drive letter.
self.abspath = name + os.sep
self.labspath = ''
self.path = name + os.sep
self.tpath = name + os.sep
self._morph()
self._lookupDict = {}
# The // and os.sep + os.sep entries are necessary because
# os.path.normpath() seems to preserve double slashes at the
# beginning of a path (presumably for UNC path names), but
# collapses triple slashes to a single slash.
self._lookupDict[''] = self
self._lookupDict['/'] = self
self._lookupDict['//'] = self
self._lookupDict[os.sep] = self
self._lookupDict[os.sep + os.sep] = self
def must_be_same(self, klass):
if klass is Dir:
return
Base.must_be_same(self, klass)
def _lookup_abs(self, p, klass, create=1):
"""
Fast (?) lookup of a *normalized* absolute path.
This method is intended for use by internal lookups with
already-normalized path data. For general-purpose lookups,
use the FS.Entry(), FS.Dir() or FS.File() methods.
The caller is responsible for making sure we're passed a
normalized absolute path; we merely let Python's dictionary look
up and return the One True Node.FS object for the path.
If no Node for the specified "p" doesn't already exist, and
"create" is specified, the Node may be created after recursive
invocation to find or create the parent directory or directories.
"""
k = _my_normcase(p)
try:
result = self._lookupDict[k]
except KeyError:
if not create:
msg = "No such file or directory: '%s' in '%s' (and create is False)" % (p, str(self))
raise SCons.Errors.UserError(msg)
# There is no Node for this path name, and we're allowed
# to create it.
dir_name, file_name = os.path.split(p)
dir_node = self._lookup_abs(dir_name, Dir)
result = klass(file_name, dir_node, self.fs)
# Double-check on disk (as configured) that the Node we
# created matches whatever is out there in the real world.
result.diskcheck_match()
self._lookupDict[k] = result
dir_node.entries[_my_normcase(file_name)] = result
dir_node.implicit = None
else:
# There is already a Node for this path name. Allow it to
# complain if we were looking for an inappropriate type.
result.must_be_same(klass)
return result
def __str__(self):
return self.abspath
def entry_abspath(self, name):
return self.abspath + name
def entry_labspath(self, name):
return '/' + name
def entry_path(self, name):
return self.path + name
def entry_tpath(self, name):
return self.tpath + name
def is_under(self, dir):
if self is dir:
return 1
else:
return 0
def up(self):
return None
def get_dir(self):
return None
def src_builder(self):
return _null
class FileNodeInfo(SCons.Node.NodeInfoBase):
current_version_id = 1
field_list = ['csig', 'timestamp', 'size']
# This should get reset by the FS initialization.
fs = None
def str_to_node(self, s):
top = self.fs.Top
root = top.root
if do_splitdrive:
drive, s = os.path.splitdrive(s)
if drive:
root = self.fs.get_root(drive)
if not os.path.isabs(s):
s = top.labspath + '/' + s
return root._lookup_abs(s, Entry)
class FileBuildInfo(SCons.Node.BuildInfoBase):
current_version_id = 1
def convert_to_sconsign(self):
"""
Converts this FileBuildInfo object for writing to a .sconsign file
This replaces each Node in our various dependency lists with its
usual string representation: relative to the top-level SConstruct
directory, or an absolute path if it's outside.
"""
if os.sep == '/':
node_to_str = str
else:
def node_to_str(n):
try:
s = n.path
except AttributeError:
s = str(n)
else:
s = s.replace(os.sep, '/')
return s
for attr in ['bsources', 'bdepends', 'bimplicit']:
try:
val = getattr(self, attr)
except AttributeError:
pass
else:
setattr(self, attr, list(map(node_to_str, val)))
def convert_from_sconsign(self, dir, name):
"""
Converts a newly-read FileBuildInfo object for in-SCons use
For normal up-to-date checking, we don't have any conversion to
perform--but we're leaving this method here to make that clear.
"""
pass
def prepare_dependencies(self):
"""
Prepares a FileBuildInfo object for explaining what changed
The bsources, bdepends and bimplicit lists have all been
stored on disk as paths relative to the top-level SConstruct
directory. Convert the strings to actual Nodes (for use by the
--debug=explain code and --implicit-cache).
"""
attrs = [
('bsources', 'bsourcesigs'),
('bdepends', 'bdependsigs'),
('bimplicit', 'bimplicitsigs'),
]
for (nattr, sattr) in attrs:
try:
strings = getattr(self, nattr)
nodeinfos = getattr(self, sattr)
except AttributeError:
continue
nodes = []
for s, ni in zip(strings, nodeinfos):
if not isinstance(s, SCons.Node.Node):
s = ni.str_to_node(s)
nodes.append(s)
setattr(self, nattr, nodes)
def format(self, names=0):
result = []
bkids = self.bsources + self.bdepends + self.bimplicit
bkidsigs = self.bsourcesigs + self.bdependsigs + self.bimplicitsigs
for bkid, bkidsig in zip(bkids, bkidsigs):
result.append(str(bkid) + ': ' +
' '.join(bkidsig.format(names=names)))
result.append('%s [%s]' % (self.bactsig, self.bact))
return '\n'.join(result)
class File(Base):
"""A class for files in a file system.
"""
memoizer_counters = []
NodeInfo = FileNodeInfo
BuildInfo = FileBuildInfo
md5_chunksize = 64
def diskcheck_match(self):
diskcheck_match(self, self.isdir,
"Directory %s found where file expected.")
def __init__(self, name, directory, fs):
if __debug__: logInstanceCreation(self, 'Node.FS.File')
Base.__init__(self, name, directory, fs)
self._morph()
def Entry(self, name):
"""Create an entry node named 'name' relative to
the directory of this file."""
return self.dir.Entry(name)
def Dir(self, name, create=True):
"""Create a directory node named 'name' relative to
the directory of this file."""
return self.dir.Dir(name, create=create)
def Dirs(self, pathlist):
"""Create a list of directories relative to the SConscript
directory of this file."""
return [self.Dir(p) for p in pathlist]
def File(self, name):
"""Create a file node named 'name' relative to
the directory of this file."""
return self.dir.File(name)
#def generate_build_dict(self):
# """Return an appropriate dictionary of values for building
# this File."""
# return {'Dir' : self.Dir,
# 'File' : self.File,
# 'RDirs' : self.RDirs}
def _morph(self):
"""Turn a file system node into a File object."""
self.scanner_paths = {}
if not hasattr(self, '_local'):
self._local = 0
# If there was already a Builder set on this entry, then
# we need to make sure we call the target-decider function,
# not the source-decider. Reaching in and doing this by hand
# is a little bogus. We'd prefer to handle this by adding
# an Entry.builder_set() method that disambiguates like the
# other methods, but that starts running into problems with the
# fragile way we initialize Dir Nodes with their Mkdir builders,
# yet still allow them to be overridden by the user. Since it's
# not clear right now how to fix that, stick with what works
# until it becomes clear...
if self.has_builder():
self.changed_since_last_build = self.decide_target
def scanner_key(self):
return self.get_suffix()
def get_contents(self):
if not self.rexists():
return ''
fname = self.rfile().abspath
try:
contents = open(fname, "rb").read()
except EnvironmentError, e:
if not e.filename:
e.filename = fname
raise
return contents
# This attempts to figure out what the encoding of the text is
# based upon the BOM bytes, and then decodes the contents so that
# it's a valid python string.
def get_text_contents(self):
contents = self.get_contents()
# The behavior of various decode() methods and functions
# w.r.t. the initial BOM bytes is different for different
# encodings and/or Python versions. ('utf-8' does not strip
# them, but has a 'utf-8-sig' which does; 'utf-16' seems to
# strip them; etc.) Just sidestep all the complication by
# explicitly stripping the BOM before we decode().
if contents.startswith(codecs.BOM_UTF8):
return contents[len(codecs.BOM_UTF8):].decode('utf-8')
if contents.startswith(codecs.BOM_UTF16_LE):
return contents[len(codecs.BOM_UTF16_LE):].decode('utf-16-le')
if contents.startswith(codecs.BOM_UTF16_BE):
return contents[len(codecs.BOM_UTF16_BE):].decode('utf-16-be')
return contents
def get_content_hash(self):
"""
Compute and return the MD5 hash for this file.
"""
if not self.rexists():
return SCons.Util.MD5signature('')
fname = self.rfile().abspath
try:
cs = SCons.Util.MD5filesignature(fname,
chunksize=SCons.Node.FS.File.md5_chunksize*1024)
except EnvironmentError, e:
if not e.filename:
e.filename = fname
raise
return cs
memoizer_counters.append(SCons.Memoize.CountValue('get_size'))
def get_size(self):
try:
return self._memo['get_size']
except KeyError:
pass
if self.rexists():
size = self.rfile().getsize()
else:
size = 0
self._memo['get_size'] = size
return size
memoizer_counters.append(SCons.Memoize.CountValue('get_timestamp'))
def get_timestamp(self):
try:
return self._memo['get_timestamp']
except KeyError:
pass
if self.rexists():
timestamp = self.rfile().getmtime()
else:
timestamp = 0
self._memo['get_timestamp'] = timestamp
return timestamp
def store_info(self):
# Merge our build information into the already-stored entry.
# This accomodates "chained builds" where a file that's a target
# in one build (SConstruct file) is a source in a different build.
# See test/chained-build.py for the use case.
if do_store_info:
self.dir.sconsign().store_info(self.name, self)
convert_copy_attrs = [
'bsources',
'bimplicit',
'bdepends',
'bact',
'bactsig',
'ninfo',
]
convert_sig_attrs = [
'bsourcesigs',
'bimplicitsigs',
'bdependsigs',
]
def convert_old_entry(self, old_entry):
# Convert a .sconsign entry from before the Big Signature
# Refactoring, doing what we can to convert its information
# to the new .sconsign entry format.
#
# The old format looked essentially like this:
#
# BuildInfo
# .ninfo (NodeInfo)
# .bsig
# .csig
# .timestamp
# .size
# .bsources
# .bsourcesigs ("signature" list)
# .bdepends
# .bdependsigs ("signature" list)
# .bimplicit
# .bimplicitsigs ("signature" list)
# .bact
# .bactsig
#
# The new format looks like this:
#
# .ninfo (NodeInfo)
# .bsig
# .csig
# .timestamp
# .size
# .binfo (BuildInfo)
# .bsources
# .bsourcesigs (NodeInfo list)
# .bsig
# .csig
# .timestamp
# .size
# .bdepends
# .bdependsigs (NodeInfo list)
# .bsig
# .csig
# .timestamp
# .size
# .bimplicit
# .bimplicitsigs (NodeInfo list)
# .bsig
# .csig
# .timestamp
# .size
# .bact
# .bactsig
#
# The basic idea of the new structure is that a NodeInfo always
# holds all available information about the state of a given Node
# at a certain point in time. The various .b*sigs lists can just
# be a list of pointers to the .ninfo attributes of the different
# dependent nodes, without any copying of information until it's
# time to pickle it for writing out to a .sconsign file.
#
# The complicating issue is that the *old* format only stored one
# "signature" per dependency, based on however the *last* build
# was configured. We don't know from just looking at it whether
# it was a build signature, a content signature, or a timestamp
# "signature". Since we no longer use build signatures, the
# best we can do is look at the length and if it's thirty two,
# assume that it was (or might have been) a content signature.
# If it was actually a build signature, then it will cause a
# rebuild anyway when it doesn't match the new content signature,
# but that's probably the best we can do.
import SCons.SConsign
new_entry = SCons.SConsign.SConsignEntry()
new_entry.binfo = self.new_binfo()
binfo = new_entry.binfo
for attr in self.convert_copy_attrs:
try:
value = getattr(old_entry, attr)
except AttributeError:
continue
setattr(binfo, attr, value)
delattr(old_entry, attr)
for attr in self.convert_sig_attrs:
try:
sig_list = getattr(old_entry, attr)
except AttributeError:
continue
value = []
for sig in sig_list:
ninfo = self.new_ninfo()
if len(sig) == 32:
ninfo.csig = sig
else:
ninfo.timestamp = sig
value.append(ninfo)
setattr(binfo, attr, value)
delattr(old_entry, attr)
return new_entry
memoizer_counters.append(SCons.Memoize.CountValue('get_stored_info'))
def get_stored_info(self):
try:
return self._memo['get_stored_info']
except KeyError:
pass
try:
sconsign_entry = self.dir.sconsign().get_entry(self.name)
except (KeyError, EnvironmentError):
import SCons.SConsign
sconsign_entry = SCons.SConsign.SConsignEntry()
sconsign_entry.binfo = self.new_binfo()
sconsign_entry.ninfo = self.new_ninfo()
else:
if isinstance(sconsign_entry, FileBuildInfo):
# This is a .sconsign file from before the Big Signature
# Refactoring; convert it as best we can.
sconsign_entry = self.convert_old_entry(sconsign_entry)
try:
delattr(sconsign_entry.ninfo, 'bsig')
except AttributeError:
pass
self._memo['get_stored_info'] = sconsign_entry
return sconsign_entry
def get_stored_implicit(self):
binfo = self.get_stored_info().binfo
binfo.prepare_dependencies()
try: return binfo.bimplicit
except AttributeError: return None
def rel_path(self, other):
return self.dir.rel_path(other)
def _get_found_includes_key(self, env, scanner, path):
return (id(env), id(scanner), path)
memoizer_counters.append(SCons.Memoize.CountDict('get_found_includes', _get_found_includes_key))
def get_found_includes(self, env, scanner, path):
"""Return the included implicit dependencies in this file.
Cache results so we only scan the file once per path
regardless of how many times this information is requested.
"""
memo_key = (id(env), id(scanner), path)
try:
memo_dict = self._memo['get_found_includes']
except KeyError:
memo_dict = {}
self._memo['get_found_includes'] = memo_dict
else:
try:
return memo_dict[memo_key]
except KeyError:
pass
if scanner:
# result = [n.disambiguate() for n in scanner(self, env, path)]
result = scanner(self, env, path)
result = [N.disambiguate() for N in result]
else:
result = []
memo_dict[memo_key] = result
return result
def _createDir(self):
# ensure that the directories for this node are
# created.
self.dir._create()
def push_to_cache(self):
"""Try to push the node into a cache
"""
# This should get called before the Nodes' .built() method is
# called, which would clear the build signature if the file has
# a source scanner.
#
# We have to clear the local memoized values *before* we push
# the node to cache so that the memoization of the self.exists()
# return value doesn't interfere.
if self.nocache:
return
self.clear_memoized_values()
if self.exists():
self.get_build_env().get_CacheDir().push(self)
def retrieve_from_cache(self):
"""Try to retrieve the node's content from a cache
This method is called from multiple threads in a parallel build,
so only do thread safe stuff here. Do thread unsafe stuff in
built().
Returns true iff the node was successfully retrieved.
"""
if self.nocache:
return None
if not self.is_derived():
return None
return self.get_build_env().get_CacheDir().retrieve(self)
def visited(self):
if self.exists():
self.get_build_env().get_CacheDir().push_if_forced(self)
ninfo = self.get_ninfo()
csig = self.get_max_drift_csig()
if csig:
ninfo.csig = csig
ninfo.timestamp = self.get_timestamp()
ninfo.size = self.get_size()
if not self.has_builder():
# This is a source file, but it might have been a target file
# in another build that included more of the DAG. Copy
# any build information that's stored in the .sconsign file
# into our binfo object so it doesn't get lost.
old = self.get_stored_info()
self.get_binfo().__dict__.update(old.binfo.__dict__)
self.store_info()
def find_src_builder(self):
if self.rexists():
return None
scb = self.dir.src_builder()
if scb is _null:
if diskcheck_sccs(self.dir, self.name):
scb = get_DefaultSCCSBuilder()
elif diskcheck_rcs(self.dir, self.name):
scb = get_DefaultRCSBuilder()
else:
scb = None
if scb is not None:
try:
b = self.builder
except AttributeError:
b = None
if b is None:
self.builder_set(scb)
return scb
def has_src_builder(self):
"""Return whether this Node has a source builder or not.
If this Node doesn't have an explicit source code builder, this
is where we figure out, on the fly, if there's a transparent
source code builder for it.
Note that if we found a source builder, we also set the
self.builder attribute, so that all of the methods that actually
*build* this file don't have to do anything different.
"""
try:
scb = self.sbuilder
except AttributeError:
scb = self.sbuilder = self.find_src_builder()
return scb is not None
def alter_targets(self):
"""Return any corresponding targets in a variant directory.
"""
if self.is_derived():
return [], None
return self.fs.variant_dir_target_climb(self, self.dir, [self.name])
def _rmv_existing(self):
self.clear_memoized_values()
e = Unlink(self, [], None)
if isinstance(e, SCons.Errors.BuildError):
raise e
#
# Taskmaster interface subsystem
#
def make_ready(self):
self.has_src_builder()
self.get_binfo()
def prepare(self):
"""Prepare for this file to be created."""
SCons.Node.Node.prepare(self)
if self.get_state() != SCons.Node.up_to_date:
if self.exists():
if self.is_derived() and not self.precious:
self._rmv_existing()
else:
try:
self._createDir()
except SCons.Errors.StopError, drive:
desc = "No drive `%s' for target `%s'." % (drive, self)
raise SCons.Errors.StopError(desc)
#
#
#
def remove(self):
"""Remove this file."""
if self.exists() or self.islink():
self.fs.unlink(self.path)
return 1
return None
def do_duplicate(self, src):
self._createDir()
Unlink(self, None, None)
e = Link(self, src, None)
if isinstance(e, SCons.Errors.BuildError):
desc = "Cannot duplicate `%s' in `%s': %s." % (src.path, self.dir.path, e.errstr)
raise SCons.Errors.StopError(desc)
self.linked = 1
# The Link() action may or may not have actually
# created the file, depending on whether the -n
# option was used or not. Delete the _exists and
# _rexists attributes so they can be reevaluated.
self.clear()
memoizer_counters.append(SCons.Memoize.CountValue('exists'))
def exists(self):
try:
return self._memo['exists']
except KeyError:
pass
# Duplicate from source path if we are set up to do this.
if self.duplicate and not self.is_derived() and not self.linked:
src = self.srcnode()
if src is not self:
# At this point, src is meant to be copied in a variant directory.
src = src.rfile()
if src.abspath != self.abspath:
if src.exists():
self.do_duplicate(src)
# Can't return 1 here because the duplication might
# not actually occur if the -n option is being used.
else:
# The source file does not exist. Make sure no old
# copy remains in the variant directory.
if Base.exists(self) or self.islink():
self.fs.unlink(self.path)
# Return None explicitly because the Base.exists() call
# above will have cached its value if the file existed.
self._memo['exists'] = None
return None
result = Base.exists(self)
self._memo['exists'] = result
return result
#
# SIGNATURE SUBSYSTEM
#
def get_max_drift_csig(self):
"""
Returns the content signature currently stored for this node
if it's been unmodified longer than the max_drift value, or the
max_drift value is 0. Returns None otherwise.
"""
old = self.get_stored_info()
mtime = self.get_timestamp()
max_drift = self.fs.max_drift
if max_drift > 0:
if (time.time() - mtime) > max_drift:
try:
n = old.ninfo
if n.timestamp and n.csig and n.timestamp == mtime:
return n.csig
except AttributeError:
pass
elif max_drift == 0:
try:
return old.ninfo.csig
except AttributeError:
pass
return None
def get_csig(self):
"""
Generate a node's content signature, the digested signature
of its content.
node - the node
cache - alternate node to use for the signature cache
returns - the content signature
"""
ninfo = self.get_ninfo()
try:
return ninfo.csig
except AttributeError:
pass
csig = self.get_max_drift_csig()
if csig is None:
try:
if self.get_size() < SCons.Node.FS.File.md5_chunksize:
contents = self.get_contents()
else:
csig = self.get_content_hash()
except IOError:
# This can happen if there's actually a directory on-disk,
# which can be the case if they've disabled disk checks,
# or if an action with a File target actually happens to
# create a same-named directory by mistake.
csig = ''
else:
if not csig:
csig = SCons.Util.MD5signature(contents)
ninfo.csig = csig
return csig
#
# DECISION SUBSYSTEM
#
def builder_set(self, builder):
SCons.Node.Node.builder_set(self, builder)
self.changed_since_last_build = self.decide_target
def changed_content(self, target, prev_ni):
cur_csig = self.get_csig()
try:
return cur_csig != prev_ni.csig
except AttributeError:
return 1
def changed_state(self, target, prev_ni):
return self.state != SCons.Node.up_to_date
def changed_timestamp_then_content(self, target, prev_ni):
if not self.changed_timestamp_match(target, prev_ni):
try:
self.get_ninfo().csig = prev_ni.csig
except AttributeError:
pass
return False
return self.changed_content(target, prev_ni)
def changed_timestamp_newer(self, target, prev_ni):
try:
return self.get_timestamp() > target.get_timestamp()
except AttributeError:
return 1
def changed_timestamp_match(self, target, prev_ni):
try:
return self.get_timestamp() != prev_ni.timestamp
except AttributeError:
return 1
def decide_source(self, target, prev_ni):
return target.get_build_env().decide_source(self, target, prev_ni)
def decide_target(self, target, prev_ni):
return target.get_build_env().decide_target(self, target, prev_ni)
# Initialize this Node's decider function to decide_source() because
# every file is a source file until it has a Builder attached...
changed_since_last_build = decide_source
def is_up_to_date(self):
T = 0
if T: Trace('is_up_to_date(%s):' % self)
if not self.exists():
if T: Trace(' not self.exists():')
# The file doesn't exist locally...
r = self.rfile()
if r != self:
# ...but there is one in a Repository...
if not self.changed(r):
if T: Trace(' changed(%s):' % r)
# ...and it's even up-to-date...
if self._local:
# ...and they'd like a local copy.
e = LocalCopy(self, r, None)
if isinstance(e, SCons.Errors.BuildError):
raise
self.store_info()
if T: Trace(' 1\n')
return 1
self.changed()
if T: Trace(' None\n')
return None
else:
r = self.changed()
if T: Trace(' self.exists(): %s\n' % r)
return not r
memoizer_counters.append(SCons.Memoize.CountValue('rfile'))
def rfile(self):
try:
return self._memo['rfile']
except KeyError:
pass
result = self
if not self.exists():
norm_name = _my_normcase(self.name)
for dir in self.dir.get_all_rdirs():
try: node = dir.entries[norm_name]
except KeyError: node = dir.file_on_disk(self.name)
if node and node.exists() and \
(isinstance(node, File) or isinstance(node, Entry) \
or not node.is_derived()):
result = node
# Copy over our local attributes to the repository
# Node so we identify shared object files in the
# repository and don't assume they're static.
#
# This isn't perfect; the attribute would ideally
# be attached to the object in the repository in
# case it was built statically in the repository
# and we changed it to shared locally, but that's
# rarely the case and would only occur if you
# intentionally used the same suffix for both
# shared and static objects anyway. So this
# should work well in practice.
result.attributes = self.attributes
break
self._memo['rfile'] = result
return result
def rstr(self):
return str(self.rfile())
def get_cachedir_csig(self):
"""
Fetch a Node's content signature for purposes of computing
another Node's cachesig.
This is a wrapper around the normal get_csig() method that handles
the somewhat obscure case of using CacheDir with the -n option.
Any files that don't exist would normally be "built" by fetching
them from the cache, but the normal get_csig() method will try
to open up the local file, which doesn't exist because the -n
option meant we didn't actually pull the file from cachedir.
But since the file *does* actually exist in the cachedir, we
can use its contents for the csig.
"""
try:
return self.cachedir_csig
except AttributeError:
pass
cachedir, cachefile = self.get_build_env().get_CacheDir().cachepath(self)
if not self.exists() and cachefile and os.path.exists(cachefile):
self.cachedir_csig = SCons.Util.MD5filesignature(cachefile, \
SCons.Node.FS.File.md5_chunksize * 1024)
else:
self.cachedir_csig = self.get_csig()
return self.cachedir_csig
def get_cachedir_bsig(self):
try:
return self.cachesig
except AttributeError:
pass
# Add the path to the cache signature, because multiple
# targets built by the same action will all have the same
# build signature, and we have to differentiate them somehow.
children = self.children()
executor = self.get_executor()
# sigs = [n.get_cachedir_csig() for n in children]
sigs = [n.get_cachedir_csig() for n in children]
sigs.append(SCons.Util.MD5signature(executor.get_contents()))
sigs.append(self.path)
result = self.cachesig = SCons.Util.MD5collect(sigs)
return result
default_fs = None
def get_default_fs():
global default_fs
if not default_fs:
default_fs = FS()
return default_fs
class FileFinder(object):
"""
"""
if SCons.Memoize.use_memoizer:
__metaclass__ = SCons.Memoize.Memoized_Metaclass
memoizer_counters = []
def __init__(self):
self._memo = {}
def filedir_lookup(self, p, fd=None):
"""
A helper method for find_file() that looks up a directory for
a file we're trying to find. This only creates the Dir Node if
it exists on-disk, since if the directory doesn't exist we know
we won't find any files in it... :-)
It would be more compact to just use this as a nested function
with a default keyword argument (see the commented-out version
below), but that doesn't work unless you have nested scopes,
so we define it here just so this work under Python 1.5.2.
"""
if fd is None:
fd = self.default_filedir
dir, name = os.path.split(fd)
drive, d = os.path.splitdrive(dir)
if not name and d[:1] in ('/', os.sep):
#return p.fs.get_root(drive).dir_on_disk(name)
return p.fs.get_root(drive)
if dir:
p = self.filedir_lookup(p, dir)
if not p:
return None
norm_name = _my_normcase(name)
try:
node = p.entries[norm_name]
except KeyError:
return p.dir_on_disk(name)
if isinstance(node, Dir):
return node
if isinstance(node, Entry):
node.must_be_same(Dir)
return node
return None
def _find_file_key(self, filename, paths, verbose=None):
return (filename, paths)
memoizer_counters.append(SCons.Memoize.CountDict('find_file', _find_file_key))
def find_file(self, filename, paths, verbose=None):
"""
find_file(str, [Dir()]) -> [nodes]
filename - a filename to find
paths - a list of directory path *nodes* to search in. Can be
represented as a list, a tuple, or a callable that is
called with no arguments and returns the list or tuple.
returns - the node created from the found file.
Find a node corresponding to either a derived file or a file
that exists already.
Only the first file found is returned, and none is returned
if no file is found.
"""
memo_key = self._find_file_key(filename, paths)
try:
memo_dict = self._memo['find_file']
except KeyError:
memo_dict = {}
self._memo['find_file'] = memo_dict
else:
try:
return memo_dict[memo_key]
except KeyError:
pass
if verbose and not callable(verbose):
if not SCons.Util.is_String(verbose):
verbose = "find_file"
_verbose = u' %s: ' % verbose
verbose = lambda s: sys.stdout.write(_verbose + s)
filedir, filename = os.path.split(filename)
if filedir:
# More compact code that we can't use until we drop
# support for Python 1.5.2:
#
#def filedir_lookup(p, fd=filedir):
# """
# A helper function that looks up a directory for a file
# we're trying to find. This only creates the Dir Node
# if it exists on-disk, since if the directory doesn't
# exist we know we won't find any files in it... :-)
# """
# dir, name = os.path.split(fd)
# if dir:
# p = filedir_lookup(p, dir)
# if not p:
# return None
# norm_name = _my_normcase(name)
# try:
# node = p.entries[norm_name]
# except KeyError:
# return p.dir_on_disk(name)
# if isinstance(node, Dir):
# return node
# if isinstance(node, Entry):
# node.must_be_same(Dir)
# return node
# if isinstance(node, Dir) or isinstance(node, Entry):
# return node
# return None
#paths = [_f for _f in map(filedir_lookup, paths) if _f]
self.default_filedir = filedir
paths = [_f for _f in map(self.filedir_lookup, paths) if _f]
result = None
for dir in paths:
if verbose:
verbose("looking for '%s' in '%s' ...\n" % (filename, dir))
node, d = dir.srcdir_find_file(filename)
if node:
if verbose:
verbose("... FOUND '%s' in '%s'\n" % (filename, d))
result = node
break
memo_dict[memo_key] = result
return result
find_file = FileFinder().find_file
def invalidate_node_memos(targets):
"""
Invalidate the memoized values of all Nodes (files or directories)
that are associated with the given entries. Has been added to
clear the cache of nodes affected by a direct execution of an
action (e.g. Delete/Copy/Chmod). Existing Node caches become
inconsistent if the action is run through Execute(). The argument
`targets` can be a single Node object or filename, or a sequence
of Nodes/filenames.
"""
from traceback import extract_stack
# First check if the cache really needs to be flushed. Only
# actions run in the SConscript with Execute() seem to be
# affected. XXX The way to check if Execute() is in the stacktrace
# is a very dirty hack and should be replaced by a more sensible
# solution.
for f in extract_stack():
if f[2] == 'Execute' and f[0][-14:] == 'Environment.py':
break
else:
# Dont have to invalidate, so return
return
if not SCons.Util.is_List(targets):
targets = [targets]
for entry in targets:
# If the target is a Node object, clear the cache. If it is a
# filename, look up potentially existing Node object first.
try:
entry.clear_memoized_values()
except AttributeError:
# Not a Node object, try to look up Node by filename. XXX
# This creates Node objects even for those filenames which
# do not correspond to an existing Node object.
node = get_default_fs().Entry(entry)
if node:
node.clear_memoized_values()
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4: