bundle: when forcing acceptance of incoming delta also accept snapshot
Snapshot where never considered reusable and the unbundling side always tried
to find a delta from them. In the `forced` mode this is counter-productive
because it will either connect two delta-tree that should not be connected or
it will spend potentially a lot of time because creating a full snapshot
anyway.
So in this mode, we accept the full snapshot as is.
This changeset is benchmarked with its children so please do not split them
apart when landing.
# pycompat.py - portability shim for python 3
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Mercurial portability shim for python 3.
This contains aliases to hide python version-specific details from the core.
"""
import builtins
import codecs
import concurrent.futures as futures
import functools
import getopt
import http.client as httplib
import http.cookiejar as cookielib
import inspect
import io
import json
import os
import queue
import shlex
import socketserver
import struct
import sys
import tempfile
import xmlrpc.client as xmlrpclib
ispy3 = sys.version_info[0] >= 3
ispypy = '__pypy__' in sys.builtin_module_names
TYPE_CHECKING = False
if not globals(): # hide this from non-pytype users
import typing
TYPE_CHECKING = typing.TYPE_CHECKING
def future_set_exception_info(f, exc_info):
f.set_exception(exc_info[0])
FileNotFoundError = builtins.FileNotFoundError
def identity(a):
return a
def _rapply(f, xs):
if xs is None:
# assume None means non-value of optional data
return xs
if isinstance(xs, (list, set, tuple)):
return type(xs)(_rapply(f, x) for x in xs)
if isinstance(xs, dict):
return type(xs)((_rapply(f, k), _rapply(f, v)) for k, v in xs.items())
return f(xs)
def rapply(f, xs):
"""Apply function recursively to every item preserving the data structure
>>> def f(x):
... return 'f(%s)' % x
>>> rapply(f, None) is None
True
>>> rapply(f, 'a')
'f(a)'
>>> rapply(f, {'a'}) == {'f(a)'}
True
>>> rapply(f, ['a', 'b', None, {'c': 'd'}, []])
['f(a)', 'f(b)', None, {'f(c)': 'f(d)'}, []]
>>> xs = [object()]
>>> rapply(identity, xs) is xs
True
"""
if f is identity:
# fast path mainly for py2
return xs
return _rapply(f, xs)
if os.name == r'nt':
# MBCS (or ANSI) filesystem encoding must be used as before.
# Otherwise non-ASCII filenames in existing repositories would be
# corrupted.
# This must be set once prior to any fsencode/fsdecode calls.
sys._enablelegacywindowsfsencoding() # pytype: disable=module-attr
fsencode = os.fsencode
fsdecode = os.fsdecode
oscurdir = os.curdir.encode('ascii')
oslinesep = os.linesep.encode('ascii')
osname = os.name.encode('ascii')
ospathsep = os.pathsep.encode('ascii')
ospardir = os.pardir.encode('ascii')
ossep = os.sep.encode('ascii')
osaltsep = os.altsep
if osaltsep:
osaltsep = osaltsep.encode('ascii')
osdevnull = os.devnull.encode('ascii')
sysplatform = sys.platform.encode('ascii')
sysexecutable = sys.executable
if sysexecutable:
sysexecutable = os.fsencode(sysexecutable)
def maplist(*args):
return list(map(*args))
def rangelist(*args):
return list(range(*args))
def ziplist(*args):
return list(zip(*args))
rawinput = input
getargspec = inspect.getfullargspec
long = int
if getattr(sys, 'argv', None) is not None:
# On POSIX, the char** argv array is converted to Python str using
# Py_DecodeLocale(). The inverse of this is Py_EncodeLocale(), which
# isn't directly callable from Python code. In practice, os.fsencode()
# can be used instead (this is recommended by Python's documentation
# for sys.argv).
#
# On Windows, the wchar_t **argv is passed into the interpreter as-is.
# Like POSIX, we need to emulate what Py_EncodeLocale() would do. But
# there's an additional wrinkle. What we really want to access is the
# ANSI codepage representation of the arguments, as this is what
# `int main()` would receive if Python 3 didn't define `int wmain()`
# (this is how Python 2 worked). To get that, we encode with the mbcs
# encoding, which will pass CP_ACP to the underlying Windows API to
# produce bytes.
if os.name == r'nt':
sysargv = [a.encode("mbcs", "ignore") for a in sys.argv]
else:
sysargv = [fsencode(a) for a in sys.argv]
bytechr = struct.Struct('>B').pack
byterepr = b'%r'.__mod__
class bytestr(bytes):
"""A bytes which mostly acts as a Python 2 str
>>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1)
('', 'foo', 'ascii', '1')
>>> s = bytestr(b'foo')
>>> assert s is bytestr(s)
__bytes__() should be called if provided:
>>> class bytesable:
... def __bytes__(self):
... return b'bytes'
>>> bytestr(bytesable())
'bytes'
There's no implicit conversion from non-ascii str as its encoding is
unknown:
>>> bytestr(chr(0x80)) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
UnicodeEncodeError: ...
Comparison between bytestr and bytes should work:
>>> assert bytestr(b'foo') == b'foo'
>>> assert b'foo' == bytestr(b'foo')
>>> assert b'f' in bytestr(b'foo')
>>> assert bytestr(b'f') in b'foo'
Sliced elements should be bytes, not integer:
>>> s[1], s[:2]
(b'o', b'fo')
>>> list(s), list(reversed(s))
([b'f', b'o', b'o'], [b'o', b'o', b'f'])
As bytestr type isn't propagated across operations, you need to cast
bytes to bytestr explicitly:
>>> s = bytestr(b'foo').upper()
>>> t = bytestr(s)
>>> s[0], t[0]
(70, b'F')
Be careful to not pass a bytestr object to a function which expects
bytearray-like behavior.
>>> t = bytes(t) # cast to bytes
>>> assert type(t) is bytes
"""
# Trick pytype into not demanding Iterable[int] be passed to __new__(),
# since the appropriate bytes format is done internally.
#
# https://github.com/google/pytype/issues/500
if TYPE_CHECKING:
def __init__(self, s=b''):
pass
def __new__(cls, s=b''):
if isinstance(s, bytestr):
return s
if not isinstance(
s, (bytes, bytearray)
) and not hasattr( # hasattr-py3-only
s, u'__bytes__'
):
s = str(s).encode('ascii')
return bytes.__new__(cls, s)
def __getitem__(self, key):
s = bytes.__getitem__(self, key)
if not isinstance(s, bytes):
s = bytechr(s)
return s
def __iter__(self):
return iterbytestr(bytes.__iter__(self))
def __repr__(self):
return bytes.__repr__(self)[1:] # drop b''
def iterbytestr(s):
"""Iterate bytes as if it were a str object of Python 2"""
return map(bytechr, s)
def maybebytestr(s):
"""Promote bytes to bytestr"""
if isinstance(s, bytes):
return bytestr(s)
return s
def sysbytes(s):
"""Convert an internal str (e.g. keyword, __doc__) back to bytes
This never raises UnicodeEncodeError, but only ASCII characters
can be round-trip by sysstr(sysbytes(s)).
"""
if isinstance(s, bytes):
return s
return s.encode('utf-8')
def sysstr(s):
"""Return a keyword str to be passed to Python functions such as
getattr() and str.encode()
This never raises UnicodeDecodeError. Non-ascii characters are
considered invalid and mapped to arbitrary but unique code points
such that 'sysstr(a) != sysstr(b)' for all 'a != b'.
"""
if isinstance(s, builtins.str):
return s
return s.decode('latin-1')
def strurl(url):
"""Converts a bytes url back to str"""
if isinstance(url, bytes):
return url.decode('ascii')
return url
def bytesurl(url):
"""Converts a str url to bytes by encoding in ascii"""
if isinstance(url, str):
return url.encode('ascii')
return url
def raisewithtb(exc, tb):
"""Raise exception with the given traceback"""
raise exc.with_traceback(tb)
def getdoc(obj):
"""Get docstring as bytes; may be None so gettext() won't confuse it
with _('')"""
doc = getattr(obj, '__doc__', None)
if doc is None:
return doc
return sysbytes(doc)
def _wrapattrfunc(f):
@functools.wraps(f)
def w(object, name, *args):
return f(object, sysstr(name), *args)
return w
# these wrappers are automagically imported by hgloader
delattr = _wrapattrfunc(builtins.delattr)
getattr = _wrapattrfunc(builtins.getattr)
hasattr = _wrapattrfunc(builtins.hasattr)
setattr = _wrapattrfunc(builtins.setattr)
xrange = builtins.range
unicode = str
def open(name, mode=b'r', buffering=-1, encoding=None):
return builtins.open(name, sysstr(mode), buffering, encoding)
safehasattr = _wrapattrfunc(builtins.hasattr)
def _getoptbwrapper(orig, args, shortlist, namelist):
"""
Takes bytes arguments, converts them to unicode, pass them to
getopt.getopt(), convert the returned values back to bytes and then
return them for Python 3 compatibility as getopt.getopt() don't accepts
bytes on Python 3.
"""
args = [a.decode('latin-1') for a in args]
shortlist = shortlist.decode('latin-1')
namelist = [a.decode('latin-1') for a in namelist]
opts, args = orig(args, shortlist, namelist)
opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) for a in opts]
args = [a.encode('latin-1') for a in args]
return opts, args
def strkwargs(dic):
"""
Converts the keys of a python dictonary to str i.e. unicodes so that
they can be passed as keyword arguments as dictionaries with bytes keys
can't be passed as keyword arguments to functions on Python 3.
"""
dic = {k.decode('latin-1'): v for k, v in dic.items()}
return dic
def byteskwargs(dic):
"""
Converts keys of python dictionaries to bytes as they were converted to
str to pass that dictonary as a keyword argument on Python 3.
"""
dic = {k.encode('latin-1'): v for k, v in dic.items()}
return dic
# TODO: handle shlex.shlex().
def shlexsplit(s, comments=False, posix=True):
"""
Takes bytes argument, convert it to str i.e. unicodes, pass that into
shlex.split(), convert the returned value to bytes and return that for
Python 3 compatibility as shelx.split() don't accept bytes on Python 3.
"""
ret = shlex.split(s.decode('latin-1'), comments, posix)
return [a.encode('latin-1') for a in ret]
iteritems = lambda x: x.items()
itervalues = lambda x: x.values()
json_loads = json.loads
isjython = sysplatform.startswith(b'java')
isdarwin = sysplatform.startswith(b'darwin')
islinux = sysplatform.startswith(b'linux')
isposix = osname == b'posix'
iswindows = osname == b'nt'
def getoptb(args, shortlist, namelist):
return _getoptbwrapper(getopt.getopt, args, shortlist, namelist)
def gnugetoptb(args, shortlist, namelist):
return _getoptbwrapper(getopt.gnu_getopt, args, shortlist, namelist)
def mkdtemp(suffix=b'', prefix=b'tmp', dir=None):
return tempfile.mkdtemp(suffix, prefix, dir)
# text=True is not supported; use util.from/tonativeeol() instead
def mkstemp(suffix=b'', prefix=b'tmp', dir=None):
return tempfile.mkstemp(suffix, prefix, dir)
# TemporaryFile does not support an "encoding=" argument on python2.
# This wrapper file are always open in byte mode.
def unnamedtempfile(mode=None, *args, **kwargs):
if mode is None:
mode = 'w+b'
else:
mode = sysstr(mode)
assert 'b' in mode
return tempfile.TemporaryFile(mode, *args, **kwargs)
# NamedTemporaryFile does not support an "encoding=" argument on python2.
# This wrapper file are always open in byte mode.
def namedtempfile(
mode=b'w+b', bufsize=-1, suffix=b'', prefix=b'tmp', dir=None, delete=True
):
mode = sysstr(mode)
assert 'b' in mode
return tempfile.NamedTemporaryFile(
mode, bufsize, suffix=suffix, prefix=prefix, dir=dir, delete=delete
)