390 lines
13 KiB
Python
390 lines
13 KiB
Python
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"""SCons.SConsign
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Writing and reading information to the .sconsign file or files.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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__revision__ = "src/engine/SCons/SConsign.py 2013/03/03 09:48:35 garyo"
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import SCons.compat
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import os
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# compat layer imports "cPickle" for us if it's available.
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import pickle
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import SCons.dblite
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import SCons.Warnings
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def corrupt_dblite_warning(filename):
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SCons.Warnings.warn(SCons.Warnings.CorruptSConsignWarning,
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"Ignoring corrupt .sconsign file: %s"%filename)
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SCons.dblite.ignore_corrupt_dbfiles = 1
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SCons.dblite.corruption_warning = corrupt_dblite_warning
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#XXX Get rid of the global array so this becomes re-entrant.
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sig_files = []
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# Info for the database SConsign implementation (now the default):
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# "DataBase" is a dictionary that maps top-level SConstruct directories
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# to open database handles.
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# "DB_Module" is the Python database module to create the handles.
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# "DB_Name" is the base name of the database file (minus any
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# extension the underlying DB module will add).
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DataBase = {}
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DB_Module = SCons.dblite
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DB_Name = ".sconsign"
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DB_sync_list = []
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def Get_DataBase(dir):
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global DataBase, DB_Module, DB_Name
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top = dir.fs.Top
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if not os.path.isabs(DB_Name) and top.repositories:
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mode = "c"
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for d in [top] + top.repositories:
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if dir.is_under(d):
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try:
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return DataBase[d], mode
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except KeyError:
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path = d.entry_abspath(DB_Name)
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try: db = DataBase[d] = DB_Module.open(path, mode)
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except (IOError, OSError): pass
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else:
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if mode != "r":
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DB_sync_list.append(db)
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return db, mode
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mode = "r"
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try:
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return DataBase[top], "c"
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except KeyError:
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db = DataBase[top] = DB_Module.open(DB_Name, "c")
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DB_sync_list.append(db)
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return db, "c"
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except TypeError:
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print "DataBase =", DataBase
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raise
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def Reset():
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"""Reset global state. Used by unit tests that end up using
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SConsign multiple times to get a clean slate for each test."""
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global sig_files, DB_sync_list
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sig_files = []
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DB_sync_list = []
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normcase = os.path.normcase
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def write():
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global sig_files
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for sig_file in sig_files:
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sig_file.write(sync=0)
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for db in DB_sync_list:
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try:
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syncmethod = db.sync
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except AttributeError:
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pass # Not all dbm modules have sync() methods.
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else:
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syncmethod()
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try:
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closemethod = db.close
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except AttributeError:
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pass # Not all dbm modules have close() methods.
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else:
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closemethod()
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class SConsignEntry(object):
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"""
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Wrapper class for the generic entry in a .sconsign file.
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The Node subclass populates it with attributes as it pleases.
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XXX As coded below, we do expect a '.binfo' attribute to be added,
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but we'll probably generalize this in the next refactorings.
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"""
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current_version_id = 1
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def __init__(self):
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# Create an object attribute from the class attribute so it ends up
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# in the pickled data in the .sconsign file.
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_version_id = self.current_version_id
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def convert_to_sconsign(self):
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self.binfo.convert_to_sconsign()
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def convert_from_sconsign(self, dir, name):
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self.binfo.convert_from_sconsign(dir, name)
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class Base(object):
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"""
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This is the controlling class for the signatures for the collection of
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entries associated with a specific directory. The actual directory
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association will be maintained by a subclass that is specific to
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the underlying storage method. This class provides a common set of
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methods for fetching and storing the individual bits of information
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that make up signature entry.
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"""
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def __init__(self):
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self.entries = {}
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self.dirty = False
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self.to_be_merged = {}
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def get_entry(self, filename):
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"""
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Fetch the specified entry attribute.
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"""
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return self.entries[filename]
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def set_entry(self, filename, obj):
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"""
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Set the entry.
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"""
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self.entries[filename] = obj
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self.dirty = True
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def do_not_set_entry(self, filename, obj):
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pass
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def store_info(self, filename, node):
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entry = node.get_stored_info()
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entry.binfo.merge(node.get_binfo())
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self.to_be_merged[filename] = node
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self.dirty = True
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def do_not_store_info(self, filename, node):
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pass
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def merge(self):
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for key, node in self.to_be_merged.items():
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entry = node.get_stored_info()
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try:
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ninfo = entry.ninfo
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except AttributeError:
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# This happens with SConf Nodes, because the configuration
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# subsystem takes direct control over how the build decision
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# is made and its information stored.
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pass
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else:
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ninfo.merge(node.get_ninfo())
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self.entries[key] = entry
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self.to_be_merged = {}
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class DB(Base):
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"""
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A Base subclass that reads and writes signature information
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from a global .sconsign.db* file--the actual file suffix is
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determined by the database module.
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"""
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def __init__(self, dir):
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Base.__init__(self)
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self.dir = dir
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db, mode = Get_DataBase(dir)
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# Read using the path relative to the top of the Repository
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# (self.dir.tpath) from which we're fetching the signature
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# information.
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path = normcase(dir.tpath)
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try:
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rawentries = db[path]
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except KeyError:
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pass
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else:
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try:
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self.entries = pickle.loads(rawentries)
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if not isinstance(self.entries, dict):
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self.entries = {}
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raise TypeError
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except KeyboardInterrupt:
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raise
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except Exception, e:
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SCons.Warnings.warn(SCons.Warnings.CorruptSConsignWarning,
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"Ignoring corrupt sconsign entry : %s (%s)\n"%(self.dir.tpath, e))
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for key, entry in self.entries.items():
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entry.convert_from_sconsign(dir, key)
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if mode == "r":
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# This directory is actually under a repository, which means
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# likely they're reaching in directly for a dependency on
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# a file there. Don't actually set any entry info, so we
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# won't try to write to that .sconsign.dblite file.
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self.set_entry = self.do_not_set_entry
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self.store_info = self.do_not_store_info
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global sig_files
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sig_files.append(self)
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def write(self, sync=1):
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if not self.dirty:
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return
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self.merge()
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db, mode = Get_DataBase(self.dir)
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# Write using the path relative to the top of the SConstruct
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# directory (self.dir.path), not relative to the top of
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# the Repository; we only write to our own .sconsign file,
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# not to .sconsign files in Repositories.
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path = normcase(self.dir.path)
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for key, entry in self.entries.items():
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entry.convert_to_sconsign()
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db[path] = pickle.dumps(self.entries, 1)
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if sync:
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try:
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syncmethod = db.sync
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except AttributeError:
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# Not all anydbm modules have sync() methods.
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pass
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else:
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syncmethod()
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class Dir(Base):
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def __init__(self, fp=None, dir=None):
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"""
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fp - file pointer to read entries from
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"""
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Base.__init__(self)
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if not fp:
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return
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self.entries = pickle.load(fp)
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if not isinstance(self.entries, dict):
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self.entries = {}
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raise TypeError
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if dir:
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for key, entry in self.entries.items():
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entry.convert_from_sconsign(dir, key)
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class DirFile(Dir):
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"""
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Encapsulates reading and writing a per-directory .sconsign file.
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"""
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def __init__(self, dir):
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"""
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dir - the directory for the file
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"""
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self.dir = dir
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self.sconsign = os.path.join(dir.path, '.sconsign')
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try:
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fp = open(self.sconsign, 'rb')
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except IOError:
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fp = None
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try:
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Dir.__init__(self, fp, dir)
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except KeyboardInterrupt:
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raise
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except:
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SCons.Warnings.warn(SCons.Warnings.CorruptSConsignWarning,
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"Ignoring corrupt .sconsign file: %s"%self.sconsign)
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global sig_files
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sig_files.append(self)
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def write(self, sync=1):
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"""
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Write the .sconsign file to disk.
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Try to write to a temporary file first, and rename it if we
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succeed. If we can't write to the temporary file, it's
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probably because the directory isn't writable (and if so,
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how did we build anything in this directory, anyway?), so
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try to write directly to the .sconsign file as a backup.
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If we can't rename, try to copy the temporary contents back
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to the .sconsign file. Either way, always try to remove
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the temporary file at the end.
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"""
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if not self.dirty:
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return
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self.merge()
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temp = os.path.join(self.dir.path, '.scons%d' % os.getpid())
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try:
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file = open(temp, 'wb')
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fname = temp
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except IOError:
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try:
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file = open(self.sconsign, 'wb')
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fname = self.sconsign
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except IOError:
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return
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for key, entry in self.entries.items():
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entry.convert_to_sconsign()
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pickle.dump(self.entries, file, 1)
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file.close()
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if fname != self.sconsign:
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try:
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mode = os.stat(self.sconsign)[0]
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os.chmod(self.sconsign, 0666)
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os.unlink(self.sconsign)
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except (IOError, OSError):
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# Try to carry on in the face of either OSError
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# (things like permission issues) or IOError (disk
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# or network issues). If there's a really dangerous
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# issue, it should get re-raised by the calls below.
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pass
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try:
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os.rename(fname, self.sconsign)
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except OSError:
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# An OSError failure to rename may indicate something
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# like the directory has no write permission, but
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# the .sconsign file itself might still be writable,
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# so try writing on top of it directly. An IOError
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# here, or in any of the following calls, would get
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# raised, indicating something like a potentially
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# serious disk or network issue.
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open(self.sconsign, 'wb').write(open(fname, 'rb').read())
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os.chmod(self.sconsign, mode)
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try:
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os.unlink(temp)
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except (IOError, OSError):
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pass
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ForDirectory = DB
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def File(name, dbm_module=None):
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"""
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Arrange for all signatures to be stored in a global .sconsign.db*
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file.
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"""
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global ForDirectory, DB_Name, DB_Module
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if name is None:
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ForDirectory = DirFile
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DB_Module = None
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else:
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ForDirectory = DB
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DB_Name = name
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if not dbm_module is None:
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DB_Module = dbm_module
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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