tests/test-check-code.t

worker: avoid potential partial write of pickled data

Previously, the code wrote the pickled data using os.write(). However,
os.write() can write less bytes than passed to it. To trigger the problem, the
pickled data had to be larger than 2147479552 bytes on my system.

Instead, open a file object and pass it to pickle.dump(). This also has the
advantage that it doesn’t buffer the whole pickled data in memory.

Note that the opened file must be buffered because pickle doesn’t support
unbuffered streams because unbuffered streams’ write() method might write less
bytes than passed to it (like os.write()) but pickle.dump() relies on that all
bytes are written (see https://github.com/python/cpython/issues/93050).

The side effect of using a file object and a with statement is that wfd is
explicitly closed now while it seems like before it was implicitly closed by
process exit.

#require test-repo

  $ . "$TESTDIR/helpers-testrepo.sh"
  $ check_code="$TESTDIR"/../contrib/check-code.py
  $ cd "$TESTDIR"/..

New errors are not allowed. Warnings are strongly discouraged.
(The writing "no-che?k-code" is for not skipping this file when checking.)

  $ testrepohg locate \
  > -X contrib/python-zstandard \
  > -X hgext/fsmonitor/pywatchman \
  > -X mercurial/thirdparty \
  > -X mercurial/pythoncapi_compat.h \
  > | sed 's-\\-/-g' | "$check_code" --warnings --per-file=0 - || false
  Skipping contrib/automation/hgautomation/__init__.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/aws.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/cli.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/linux.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/pypi.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/ssh.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/try_server.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/windows.py it has no-che?k-code (glob)
  Skipping contrib/automation/hgautomation/winrm.py it has no-che?k-code (glob)
  Skipping contrib/fuzz/FuzzedDataProvider.h it has no-che?k-code (glob)
  Skipping contrib/fuzz/standalone_fuzz_target_runner.cc it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/cli.py it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/downloads.py it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/inno.py it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/pyoxidizer.py it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/util.py it has no-che?k-code (glob)
  Skipping contrib/packaging/hgpackaging/wix.py it has no-che?k-code (glob)
  Skipping i18n/polib.py it has no-che?k-code (glob)
  Skipping mercurial/statprof.py it has no-che?k-code (glob)
  Skipping tests/testlib/badserverext.py it has no-che?k-code (glob)

@commands in debugcommands.py should be in alphabetical order.

  >>> import re
  >>> commands = []
  >>> with open('mercurial/debugcommands.py', 'rb') as fh:
  ...     for line in fh:
  ...         m = re.match(br"^@command\('([a-z]+)", line)
  ...         if m:
  ...             commands.append(m.group(1))
  >>> scommands = list(sorted(commands))
  >>> for i, command in enumerate(scommands):
  ...     if command != commands[i]:
  ...         print('commands in debugcommands.py not sorted; first differing '
  ...               'command is %s; expected %s' % (commands[i], command))
  ...         break

Prevent adding new files in the root directory accidentally.

  $ testrepohg files 'glob:*'
  .arcconfig
  .clang-format
  .editorconfig
  .hgignore
  .hgsigs
  .hgtags
  .jshintrc
  CONTRIBUTING
  CONTRIBUTORS
  COPYING
  Makefile
  README.rst
  hg
  hgeditor
  hgweb.cgi
  pyproject.toml
  rustfmt.toml
  setup.py

Prevent adding modules which could be shadowed by ancient .so/.dylib.

  $ testrepohg files \
  > mercurial/base85.py \
  > mercurial/bdiff.py \
  > mercurial/diffhelpers.py \
  > mercurial/mpatch.py \
  > mercurial/osutil.py \
  > mercurial/parsers.py \
  > mercurial/zstd.py
  [1]

Keep python3 tests sorted:
  $ sort < contrib/python3-whitelist > $TESTTMP/py3sorted
  $ cmp contrib/python3-whitelist $TESTTMP/py3sorted || echo 'Please sort passing tests!'

Keep Windows line endings in check

  $ testrepohg files 'set:eol(dos)'
  contrib/win32/hg.bat
  contrib/win32/mercurial.ini