##// END OF EJS Templates
clone: only use stream when we understand the revlog format...
clone: only use stream when we understand the revlog format This patch fixes issues with stream cloning in the presense of parentdelta, lwcopy and similar additions that change the interpretation of the revlog format, or the format itself. Currently, the stream capability is sent like this: stream=<version of changelog> But the client doesn't actually check the version number; also, it only checks the changelog and it doesn't capture the interpretation-changes and flag-changes in parentdelta and lwcopy. This patch removes the 'stream' capability whenever we use a non-basic revlog format, to prevent old clients from receiving incorrect data. In those cases, a new capability called 'streamreqs' is added instead. Instead of a revlog version, it comes with a list of revlog-format relevant requirements, which are a subset of the repository requirements, excluding things that are not relevant for stream. New clients use this to determine whether or not they can stream. Old clients only look for the 'stream' capability, as always. New servers will still send this when serving old repositories.

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demandimport.py
160 lines | 5.5 KiB | text/x-python | PythonLexer
# demandimport.py - global demand-loading of modules for Mercurial
#
# Copyright 2006, 2007 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''
demandimport - automatic demandloading of modules
To enable this module, do:
import demandimport; demandimport.enable()
Imports of the following forms will be demand-loaded:
import a, b.c
import a.b as c
from a import b,c # a will be loaded immediately
These imports will not be delayed:
from a import *
b = __import__(a)
'''
import __builtin__
_origimport = __import__
class _demandmod(object):
"""module demand-loader and proxy"""
def __init__(self, name, globals, locals, level):
if '.' in name:
head, rest = name.split('.', 1)
after = [rest]
else:
head = name
after = []
object.__setattr__(self, "_data", (head, globals, locals, after, level))
object.__setattr__(self, "_module", None)
def _extend(self, name):
"""add to the list of submodules to load"""
self._data[3].append(name)
def _load(self):
if not self._module:
head, globals, locals, after, level = self._data
if level is not None:
mod = _origimport(head, globals, locals, level)
else:
mod = _origimport(head, globals, locals)
# load submodules
def subload(mod, p):
h, t = p, None
if '.' in p:
h, t = p.split('.', 1)
if not hasattr(mod, h):
# TODO: should we adjust the level here?
submod = _demandmod(p, mod.__dict__, mod.__dict__,
level=level)
setattr(mod, h, submod)
elif t:
subload(getattr(mod, h), t)
for x in after:
subload(mod, x)
# are we in the locals dictionary still?
if locals and locals.get(head) == self:
locals[head] = mod
object.__setattr__(self, "_module", mod)
def __repr__(self):
if self._module:
return "<proxied module '%s'>" % self._data[0]
return "<unloaded module '%s'>" % self._data[0]
def __call__(self, *args, **kwargs):
raise TypeError("%s object is not callable" % repr(self))
def __getattribute__(self, attr):
if attr in ('_data', '_extend', '_load', '_module'):
return object.__getattribute__(self, attr)
self._load()
return getattr(self._module, attr)
def __setattr__(self, attr, val):
self._load()
setattr(self._module, attr, val)
def _demandimport(name, globals=None, locals=None, fromlist=None, level=None):
if not locals or name in ignore or fromlist == ('*',):
# these cases we can't really delay
if level is None:
return _origimport(name, globals, locals, fromlist)
else:
return _origimport(name, globals, locals, fromlist, level)
elif not fromlist:
# import a [as b]
if '.' in name: # a.b
base, rest = name.split('.', 1)
# email.__init__ loading email.mime
if globals and globals.get('__name__', None) == base:
if level is not None:
return _origimport(name, globals, locals, fromlist, level)
else:
return _origimport(name, globals, locals, fromlist)
# if a is already demand-loaded, add b to its submodule list
if base in locals:
if isinstance(locals[base], _demandmod):
locals[base]._extend(rest)
return locals[base]
return _demandmod(name, globals, locals, level=level)
else:
# from a import b,c,d
if level is not None:
mod = _origimport(name, globals, locals, level=level)
else:
mod = _origimport(name, globals, locals)
# recurse down the module chain
for comp in name.split('.')[1:]:
if not hasattr(mod, comp):
# TODO: should we adjust the level here?
submod = _demandmod(comp, mod.__dict__, mod.__dict__,
level=level)
setattr(mod, comp, submod)
mod = getattr(mod, comp)
for x in fromlist:
# set requested submodules for demand load
if not(hasattr(mod, x)):
# TODO: should we adjust the level here?
submod = _demandmod(x, mod.__dict__, locals, level=level)
setattr(mod, x, submod)
return mod
ignore = [
'_hashlib',
'_xmlplus',
'fcntl',
'win32com.gen_py',
'_winreg', # 2.7 mimetypes needs immediate ImportError
'pythoncom',
# imported by tarfile, not available under Windows
'pwd',
'grp',
# imported by profile, itself imported by hotshot.stats,
# not available under Windows
'resource',
# this trips up many extension authors
'gtk',
# setuptools' pkg_resources.py expects "from __main__ import x" to
# raise ImportError if x not defined
'__main__',
'_ssl', # conditional imports in the stdlib, issue1964
]
def enable():
"enable global demand-loading of modules"
__builtin__.__import__ = _demandimport
def disable():
"disable global demand-loading of modules"
__builtin__.__import__ = _origimport