diff options
Diffstat (limited to 'engine/SCons/Node/FS.py')
| -rw-r--r-- | engine/SCons/Node/FS.py | 325 |
1 files changed, 281 insertions, 44 deletions
diff --git a/engine/SCons/Node/FS.py b/engine/SCons/Node/FS.py index ecde942..be9f7fd 100644 --- a/engine/SCons/Node/FS.py +++ b/engine/SCons/Node/FS.py @@ -11,7 +11,7 @@ that can be used by scripts or modules looking for the canonical default. """ # -# Copyright (c) 2001 - 2017 The SCons Foundation +# Copyright (c) 2001 - 2019 The SCons Foundation # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the @@ -33,7 +33,7 @@ that can be used by scripts or modules looking for the canonical default. # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. from __future__ import print_function -__revision__ = "src/engine/SCons/Node/FS.py 74b2c53bc42290e911b334a6b44f187da698a668 2017/11/14 13:16:53 bdbaddog" +__revision__ = "src/engine/SCons/Node/FS.py a56bbd8c09fb219ab8a9673330ffcd55279219d0 2019-03-26 23:16:31 bdeegan" import fnmatch import os @@ -43,6 +43,7 @@ import stat import sys import time import codecs +from itertools import chain import SCons.Action import SCons.Debug @@ -56,9 +57,12 @@ import SCons.Util import SCons.Warnings from SCons.Debug import Trace +from . import DeciderNeedsNode print_duplicate = 0 +MD5_TIMESTAMP_DEBUG = False + def sconsign_none(node): raise NotImplementedError @@ -74,6 +78,9 @@ def sconsign_dir(node): _sconsign_map = {0 : sconsign_none, 1 : sconsign_dir} +class FileBuildInfoFileToCsigMappingError(Exception): + pass + class EntryProxyAttributeError(AttributeError): """ An AttributeError subclass for recording and displaying the name @@ -132,7 +139,10 @@ def initialize_do_splitdrive(): global do_splitdrive global has_unc drive, path = os.path.splitdrive('X:/foo') - has_unc = hasattr(os.path, 'splitunc') + # splitunc is removed from python 3.7 and newer + # so we can also just test if splitdrive works with UNC + has_unc = (hasattr(os.path, 'splitunc') + or os.path.splitdrive(r'\\split\drive\test')[0] == r'\\split\drive') do_splitdrive = not not drive or has_unc @@ -282,11 +292,13 @@ def set_duplicate(duplicate): 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 ... + """ + 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].get_abspath() dest = target[0].get_abspath() dir, file = os.path.split(dest) @@ -328,7 +340,12 @@ Unlink = SCons.Action.Action(UnlinkFunc, None) def MkdirFunc(target, source, env): t = target[0] - if not t.exists(): + # This os.path.exists test looks redundant, but it's possible + # when using Install() to install multiple dirs outside the + # source tree to get a case where t.exists() is true but + # the path does already exist, so this prevents spurious + # build failures in that case. See test/Install/multi-dir. + if not t.exists() and not os.path.exists(t.get_abspath()): t.fs.mkdir(t.get_abspath()) return 0 @@ -682,10 +699,15 @@ class Base(SCons.Node.Node): @SCons.Memoize.CountMethodCall def stat(self): - try: return self._memo['stat'] - except KeyError: pass - try: result = self.fs.stat(self.get_abspath()) - except os.error: result = None + try: + return self._memo['stat'] + except KeyError: + pass + try: + result = self.fs.stat(self.get_abspath()) + except os.error: + result = None + self._memo['stat'] = result return result @@ -697,13 +719,17 @@ class Base(SCons.Node.Node): def getmtime(self): st = self.stat() - if st: return st[stat.ST_MTIME] - else: return None + 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 + if st: + return st[stat.ST_SIZE] + else: + return None def isdir(self): st = self.stat() @@ -1048,21 +1074,22 @@ _classEntry = Entry class LocalFS(object): - - # 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? + """ + 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): @@ -1389,10 +1416,10 @@ class FS(LocalFS): if not isinstance(d, SCons.Node.Node): d = self.Dir(d) self.Top.addRepository(d) - + def PyPackageDir(self, modulename): """Locate the directory of a given python module name - + For example scons might resolve to Windows: C:\Python27\Lib\site-packages\scons-2.5.1 Linux: /usr/lib/scons @@ -2462,11 +2489,42 @@ class FileNodeInfo(SCons.Node.NodeInfoBase): if key not in ('__weakref__',): setattr(self, key, value) + def __eq__(self, other): + return self.csig == other.csig and self.timestamp == other.timestamp and self.size == other.size + + def __ne__(self, other): + return not self.__eq__(other) + class FileBuildInfo(SCons.Node.BuildInfoBase): - __slots__ = () + """ + This is info loaded from sconsign. + + Attributes unique to FileBuildInfo: + dependency_map : Caches file->csig mapping + for all dependencies. Currently this is only used when using + MD5-timestamp decider. + It's used to ensure that we copy the correct + csig from previous build to be written to .sconsign when current build + is done. Previously the matching of csig to file was strictly by order + they appeared in bdepends, bsources, or bimplicit, and so a change in order + or count of any of these could yield writing wrong csig, and then false positive + rebuilds + """ + __slots__ = ('dependency_map') current_version_id = 2 + def __setattr__(self, key, value): + + # If any attributes are changed in FileBuildInfo, we need to + # invalidate the cached map of file name to content signature + # heald in dependency_map. Currently only used with + # MD5-timestamp decider + if key != 'dependency_map' and hasattr(self, 'dependency_map'): + del self.dependency_map + + return super(FileBuildInfo, self).__setattr__(key, value) + def convert_to_sconsign(self): """ Converts this FileBuildInfo object for writing to a .sconsign file @@ -3235,14 +3293,155 @@ class File(Base): 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): + + # Caching node -> string mapping for the below method + __dmap_cache = {} + __dmap_sig_cache = {} + + + def _build_dependency_map(self, binfo): + """ + Build mapping from file -> signature + + Args: + self - self + binfo - buildinfo from node being considered + + Returns: + dictionary of file->signature mappings + """ + + # For an "empty" binfo properties like bsources + # do not exist: check this to avoid exception. + if (len(binfo.bsourcesigs) + len(binfo.bdependsigs) + \ + len(binfo.bimplicitsigs)) == 0: + return {} + + + # store this info so we can avoid regenerating it. + binfo.dependency_map = { str(child):signature for child, signature in zip(chain(binfo.bsources, binfo.bdepends, binfo.bimplicit), + chain(binfo.bsourcesigs, binfo.bdependsigs, binfo.bimplicitsigs))} + + return binfo.dependency_map + + def _get_previous_signatures(self, dmap): + """ + Return a list of corresponding csigs from previous + build in order of the node/files in children. + + Args: + self - self + dmap - Dictionary of file -> csig + + Returns: + List of csigs for provided list of children + """ + prev = [] + # MD5_TIMESTAMP_DEBUG = False + + if len(dmap) == 0: + if MD5_TIMESTAMP_DEBUG: print("Nothing dmap shortcutting") + return None + + if MD5_TIMESTAMP_DEBUG: print("len(dmap):%d"%len(dmap)) + # First try the simple name for node + c_str = str(self) + if MD5_TIMESTAMP_DEBUG: print("Checking :%s"%c_str) + df = dmap.get(c_str, None) + if df: + return df + + if os.altsep: + c_str = c_str.replace(os.sep, os.altsep) + df = dmap.get(c_str, None) + if MD5_TIMESTAMP_DEBUG: print("-->%s"%df) + if df: + return df + + if not df: + try: + # this should yield a path which matches what's in the sconsign + c_str = self.get_path() + df = dmap.get(c_str, None) + if MD5_TIMESTAMP_DEBUG: print("-->%s"%df) + if df: + return df + + if os.altsep: + c_str = c_str.replace(os.sep, os.altsep) + df = dmap.get(c_str, None) + if MD5_TIMESTAMP_DEBUG: print("-->%s"%df) + if df: + return df + + except AttributeError as e: + raise FileBuildInfoFileToCsigMappingError("No mapping from file name to content signature for :%s"%c_str) + + return df + + def changed_timestamp_then_content(self, target, prev_ni, node=None): + """ + Used when decider for file is Timestamp-MD5 + + NOTE: If the timestamp hasn't changed this will skip md5'ing the + file and just copy the prev_ni provided. If the prev_ni + is wrong. It will propagate it. + See: https://github.com/SCons/scons/issues/2980 + + Args: + self - dependency + target - target + prev_ni - The NodeInfo object loaded from previous builds .sconsign + node - Node instance. This is the only changed* function which requires + node to function. So if we detect that it's not passed. + we throw DeciderNeedsNode, and caller should handle this and pass node. + + Returns: + Boolean - Indicates if node(File) has changed. + """ + if node is None: + # We need required node argument to get BuildInfo to function + raise DeciderNeedsNode(self.changed_timestamp_then_content) + + # Now get sconsign name -> csig map and then get proper prev_ni if possible + bi = node.get_stored_info().binfo + rebuilt = False + try: + dependency_map = bi.dependency_map + except AttributeError as e: + dependency_map = self._build_dependency_map(bi) + rebuilt = True + + if len(dependency_map) == 0: + # If there's no dependency map, there's no need to find the + # prev_ni as there aren't any + # shortcut the rest of the logic + if MD5_TIMESTAMP_DEBUG: print("Skipping checks len(dmap)=0") + + # We still need to get the current file's csig + # This should be slightly faster than calling self.changed_content(target, new_prev_ni) + self.get_csig() + return True + + new_prev_ni = self._get_previous_signatures(dependency_map) + new = self.changed_timestamp_match(target, new_prev_ni) + + if MD5_TIMESTAMP_DEBUG: + old = self.changed_timestamp_match(target, prev_ni) + + if old != new: + print("Mismatch self.changed_timestamp_match(%s, prev_ni) old:%s new:%s"%(str(target), old, new)) + new_prev_ni = self._get_previous_signatures(dependency_map) + + + if not new: try: - self.get_ninfo().csig = prev_ni.csig + # NOTE: We're modifying the current node's csig in a query. + self.get_ninfo().csig = new_prev_ni.csig except AttributeError: pass return False - return self.changed_content(target, prev_ni) + return self.changed_content(target, new_prev_ni) def changed_timestamp_newer(self, target, prev_ni): try: @@ -3251,6 +3450,12 @@ class File(Base): return 1 def changed_timestamp_match(self, target, prev_ni): + """ + Return True if the timestamps don't match or if there is no previous timestamp + :param target: + :param prev_ni: Information about the node from the previous build + :return: + """ try: return self.get_timestamp() != prev_ni.timestamp except AttributeError: @@ -3272,7 +3477,9 @@ class File(Base): # ...and they'd like a local copy. e = LocalCopy(self, r, None) if isinstance(e, SCons.Errors.BuildError): - raise + # Likely this should be re-raising exception e + # (which would be BuildError) + raise e SCons.Node.store_info_map[self.store_info](self) if T: Trace(' 1\n') return 1 @@ -3293,11 +3500,14 @@ class File(Base): 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) + for repo_dir in self.dir.get_all_rdirs(): + try: + node = repo_dir.entries[norm_name] + except KeyError: + node = repo_dir.file_on_disk(self.name) + if node and node.exists() and \ - (isinstance(node, File) or isinstance(node, Entry) \ + (isinstance(node, File) or isinstance(node, Entry) or not node.is_derived()): result = node # Copy over our local attributes to the repository @@ -3317,6 +3527,28 @@ class File(Base): self._memo['rfile'] = result return result + def find_repo_file(self): + """ + For this node, find if there exists a corresponding file in one or more repositories + :return: list of corresponding files in repositories + """ + retvals = [] + + norm_name = _my_normcase(self.name) + for repo_dir in self.dir.get_all_rdirs(): + try: + node = repo_dir.entries[norm_name] + except KeyError: + node = repo_dir.file_on_disk(self.name) + + if node and node.exists() and \ + (isinstance(node, File) or isinstance(node, Entry) \ + or not node.is_derived()): + retvals.append(node) + + return retvals + + def rstr(self): return str(self.rfile()) @@ -3374,6 +3606,8 @@ class File(Base): because multiple targets built by the same action will all have the same build signature, and we have to differentiate them somehow. + + Signature should normally be string of hex digits. """ try: return self.cachesig @@ -3383,10 +3617,13 @@ class File(Base): # Collect signatures for all children children = self.children() sigs = [n.get_cachedir_csig() for n in children] + # Append this node's signature... sigs.append(self.get_contents_sig()) + # ...and it's path sigs.append(self.get_internal_path()) + # Merge this all into a single signature result = self.cachesig = SCons.Util.MD5collect(sigs) return result |