view tests/test-demandimport.py @ 38727:fcb517ff9562

debug: move extensions debug behind a dedicated flag

Since b86664c81833, we process the `--debug` flag earlier. This is overall
good and useful, but has at least one negative side effect.

Previously the debug message we report when trying to import extensions were
issued before we processed the `--debug` flag. Now they happen after.

Before:

  $ ./hg id --debug
  21f507b8de2f9c1606e9aeb5ec7d2a6dedb7a4a7 tip

After:

  $ ./hg id --debug                          ☿ (revset-bench)
  could not import hgext.evolve (No module named evolve): trying hgext3rd.evolve
  could not import hgext.mercurial_keyring (No module named mercurial_keyring): trying hgext3rd.mercurial_keyring
  could not import hgext3rd.mercurial_keyring (No module named mercurial_keyring): trying mercurial_keyring
  could not import hgext.hggit (No module named hggit): trying hgext3rd.hggit
  could not import hgext3rd.hggit (No module named hggit): trying hggit
  21f507b8de2f9c1606e9aeb5ec7d2a6dedb7a4a7 tip

(This get worse if --traceback is used).

To work around this, we move this extensions related debug message behind a
new flag 'devel.debug.extensions' and restore the previous output.

I'm not fully happy about using the 'devel' section for a flag that can be
used by legitimate users to debug extensions issues. However, it fits well
next to other `devel.devel.*` options and is mostly used by extensions author
anyway.

We might move it to another, more appropriate section in the future (using
alias).

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.utils import procutil

print("procutil =", f(procutil))
print("procutil.system =", f(procutil.system))
print("procutil =", f(procutil))
print("procutil.system =", f(procutil.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)))

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())
contextlibimp = __import__('contextlib', globals(), locals(), ['unknownattr'])
print("__import__('contextlib', ..., ['unknownattr']) =", f(contextlibimp))
print("hasattr(contextlibimp, 'unknownattr') =",
      util.safehasattr(contextlibimp, 'unknownattr'))