revlog: move the details of revlog "v2" index inside revlog.utils.constants
the revlog module is quite large and this kind of format information would handy
for other module. So let us start to gather this information about the format in
a more appropriate place.
We update various reference to this information to use the new "source of truth"
in the process.
Differential Revision: https://phab.mercurial-scm.org/D10305
from __future__ import absolute_import, print_function
from mercurial import demandimport
demandimport.enable()
import os
import subprocess
import sys
import types
# Don't import pycompat because it has too many side-effects.
ispy3 = sys.version_info[0] >= 3
# Only run if demandimport is allowed
if subprocess.call(
[os.environ['PYTHON'], '%s/hghave' % os.environ['TESTDIR'], 'demandimport']
):
sys.exit(80)
# We rely on assert, which gets optimized out.
if sys.flags.optimize:
sys.exit(80)
# The demand importer doesn't work on Python 3.5.
if sys.version_info[0:2] == (3, 5):
sys.exit(80)
if ispy3:
from importlib.util import _LazyModule
try:
from importlib.util import _Module as moduletype
except ImportError:
moduletype = types.ModuleType
else:
moduletype = types.ModuleType
if os.name != 'nt':
try:
import distutils.msvc9compiler
print(
'distutils.msvc9compiler needs to be an immediate '
'importerror on non-windows platforms'
)
distutils.msvc9compiler
except ImportError:
pass
import re
rsub = re.sub
def f(obj):
l = repr(obj)
l = rsub("0x[0-9a-fA-F]+", "0x?", l)
l = rsub("from '.*'", "from '?'", l)
l = rsub("'<[a-z]*>'", "'<whatever>'", l)
return l
demandimport.disable()
os.environ['HGDEMANDIMPORT'] = 'disable'
# this enable call should not actually enable demandimport!
demandimport.enable()
from mercurial import node
# We use assert instead of a unittest test case because having imports inside
# functions changes behavior of the demand importer.
if ispy3:
assert not isinstance(node, _LazyModule)
else:
assert f(node) == "<module 'mercurial.node' from '?'>", f(node)
# now enable it for real
del os.environ['HGDEMANDIMPORT']
demandimport.enable()
# Test access to special attributes through demandmod proxy
assert 'mercurial.error' not in sys.modules
from mercurial import error as errorproxy
if ispy3:
# unsure why this isn't lazy.
assert not isinstance(f, _LazyModule)
assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy)
else:
assert f(errorproxy) == "<unloaded module 'error'>", f(errorproxy)
doc = ' '.join(errorproxy.__doc__.split()[:3])
assert doc == 'Mercurial exceptions. This', doc
assert errorproxy.__name__ == 'mercurial.error', errorproxy.__name__
# __name__ must be accessible via __dict__ so the relative imports can be
# resolved
name = errorproxy.__dict__['__name__']
assert name == 'mercurial.error', name
if ispy3:
assert not isinstance(errorproxy, _LazyModule)
assert f(errorproxy) == "<module 'mercurial.error' from '?'>", f(errorproxy)
else:
assert f(errorproxy) == "<proxied module 'error'>", f(errorproxy)
import os
if ispy3:
assert not isinstance(os, _LazyModule)
assert f(os) == "<module 'os' from '?'>", f(os)
else:
assert f(os) == "<unloaded module 'os'>", f(os)
assert f(os.system) == '<built-in function system>', f(os.system)
assert f(os) == "<module 'os' from '?'>", f(os)
assert 'mercurial.utils.procutil' not in sys.modules
from mercurial.utils import procutil
if ispy3:
assert isinstance(procutil, _LazyModule)
assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f(
procutil
)
else:
assert f(procutil) == "<unloaded module 'procutil'>", f(procutil)
assert f(procutil.system) == '<function system at 0x?>', f(procutil.system)
assert procutil.__class__ == moduletype, procutil.__class__
assert f(procutil) == "<module 'mercurial.utils.procutil' from '?'>", f(
procutil
)
assert f(procutil.system) == '<function system at 0x?>', f(procutil.system)
assert 'mercurial.hgweb' not in sys.modules
from mercurial import hgweb
if ispy3:
assert isinstance(hgweb, _LazyModule)
assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb)
assert isinstance(hgweb.hgweb_mod, _LazyModule)
assert (
f(hgweb.hgweb_mod) == "<module 'mercurial.hgweb.hgweb_mod' from '?'>"
), f(hgweb.hgweb_mod)
else:
assert f(hgweb) == "<unloaded module 'hgweb'>", f(hgweb)
assert f(hgweb.hgweb_mod) == "<unloaded module 'hgweb_mod'>", f(
hgweb.hgweb_mod
)
assert f(hgweb) == "<module 'mercurial.hgweb' from '?'>", f(hgweb)
import re as fred
if ispy3:
assert not isinstance(fred, _LazyModule)
assert f(fred) == "<module 're' from '?'>"
else:
assert f(fred) == "<unloaded module 're'>", f(fred)
import re as remod
if ispy3:
assert not isinstance(remod, _LazyModule)
assert f(remod) == "<module 're' from '?'>"
else:
assert f(remod) == "<unloaded module 're'>", f(remod)
import sys as re
if ispy3:
assert not isinstance(re, _LazyModule)
assert f(re) == "<module 'sys' (built-in)>"
else:
assert f(re) == "<unloaded module 'sys'>", f(re)
if ispy3:
assert not isinstance(fred, _LazyModule)
assert f(fred) == "<module 're' from '?'>", f(fred)
else:
assert f(fred) == "<unloaded module 're'>", f(fred)
assert f(fred.sub) == '<function sub at 0x?>', f(fred.sub)
if ispy3:
assert not isinstance(fred, _LazyModule)
assert f(fred) == "<module 're' from '?'>", f(fred)
else:
assert f(fred) == "<proxied module 're'>", f(fred)
remod.escape # use remod
assert f(remod) == "<module 're' from '?'>", f(remod)
if ispy3:
assert not isinstance(re, _LazyModule)
assert f(re) == "<module 'sys' (built-in)>"
assert f(type(re.stderr)) == "<class '_io.TextIOWrapper'>", f(
type(re.stderr)
)
assert f(re) == "<module 'sys' (built-in)>"
else:
assert f(re) == "<unloaded module 'sys'>", f(re)
assert f(re.stderr) == "<open file '<whatever>', mode 'w' at 0x?>", f(
re.stderr
)
assert f(re) == "<proxied module 'sys'>", f(re)
assert 'telnetlib' not in sys.modules
import telnetlib
if ispy3:
assert isinstance(telnetlib, _LazyModule)
assert f(telnetlib) == "<module 'telnetlib' from '?'>"
else:
assert f(telnetlib) == "<unloaded module 'telnetlib'>", f(telnetlib)
try:
from telnetlib import unknownattr
assert False, (
'no demandmod should be created for attribute of non-package '
'module:\ntelnetlib.unknownattr = %s' % f(unknownattr)
)
except ImportError as inst:
assert rsub(r"'", '', str(inst)).startswith(
'cannot import name unknownattr'
)
from mercurial import util
# Unlike the import statement, __import__() function should not raise
# ImportError even if fromlist has an unknown item
# (see Python/import.c:import_module_level() and ensure_fromlist())
assert 'ftplib' not in sys.modules
zipfileimp = __import__('ftplib', globals(), locals(), ['unknownattr'])
assert f(zipfileimp) == "<module 'ftplib' from '?'>", f(zipfileimp)
assert not util.safehasattr(zipfileimp, 'unknownattr')