filelog: don't crash on invalid copy metadata (
issue5748)
"copy" and "copyrev" are both supposed to appear next to each other.
However, a user report demonstrated a crash that indicates that
something in the wild is producing "copy" without "copyrev"
(probably `hg convert`).
While we should definitely fix the source of the bad metadata,
the bad code causing the crash is already in the wild and who knows
how many repositories are impacted. So let's be more defensive
when accessing the file revision metadata.
from __future__ import absolute_import, print_function
from mercurial import demandimport
demandimport.enable()
import os
import subprocess
import sys
# Only run if demandimport is allowed
if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'],
'demandimport']):
sys.exit(80)
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
print("node =", f(node))
# now enable it for real
del os.environ['HGDEMANDIMPORT']
demandimport.enable()
# Test access to special attributes through demandmod proxy
from mercurial import error as errorproxy
print("errorproxy =", f(errorproxy))
print("errorproxy.__doc__ = %r"
% (' '.join(errorproxy.__doc__.split()[:3]) + ' ...'))
print("errorproxy.__name__ = %r" % errorproxy.__name__)
# __name__ must be accessible via __dict__ so the relative imports can be
# resolved
print("errorproxy.__dict__['__name__'] = %r" % errorproxy.__dict__['__name__'])
print("errorproxy =", f(errorproxy))
import os
print("os =", f(os))
print("os.system =", f(os.system))
print("os =", f(os))
from mercurial import util
print("util =", f(util))
print("util.system =", f(util.system))
print("util =", f(util))
print("util.system =", f(util.system))
from mercurial import hgweb
print("hgweb =", f(hgweb))
print("hgweb_mod =", f(hgweb.hgweb_mod))
print("hgweb =", f(hgweb))
import re as fred
print("fred =", f(fred))
import re as remod
print("remod =", f(remod))
import sys as re
print("re =", f(re))
print("fred =", f(fred))
print("fred.sub =", f(fred.sub))
print("fred =", f(fred))
remod.escape # use remod
print("remod =", f(remod))
print("re =", f(re))
print("re.stderr =", f(re.stderr))
print("re =", f(re))
import contextlib
print("contextlib =", f(contextlib))
try:
from contextlib import unknownattr
print('no demandmod should be created for attribute of non-package '
'module:\ncontextlib.unknownattr =', f(unknownattr))
except ImportError as inst:
print('contextlib.unknownattr = ImportError: %s'
% rsub(r"'", '', str(inst)))
# 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())
contextlibimp = __import__('contextlib', globals(), locals(), ['unknownattr'])
print("__import__('contextlib', ..., ['unknownattr']) =", f(contextlibimp))
print("hasattr(contextlibimp, 'unknownattr') =",
util.safehasattr(contextlibimp, 'unknownattr'))