view tests/testlib/ext-sidedata.py @ 49603:3eda36e9b3d6 stable

matcher: fix issues regex flag contained in pattern (issue6759)

Python 3.11 is now enforcing that flag must be at the beginning of the regex

This creates a serious regression for people using Python 3.11 with an hgignore
using flag in a "relre" pattern.

We now detect any flags in such pattern and "prepend" our ".*" pattern after them.

In addition, we now insert the flag in the regexp to only affect the pattern we
are rewriting. Otherwise, the regex built from the combined pattern would these
flags in the middle of it anyway.

As a side effect of this last change, we fix a bug… before this change regex
flag in a pattern would affect all combined patterns. That was bad and is not
longer the case.

The Rust code needs to be updated to fix that very bug, but we will do it in
another changeset.

# ext-sidedata.py - small extension to test the sidedata logic
#
# Copyright 2019 Pierre-Yves David <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.


import hashlib
import struct

from mercurial.node import nullrev
from mercurial import (
    extensions,
    requirements,
    revlog,
)

from mercurial.upgrade_utils import engine as upgrade_engine

from mercurial.revlogutils import constants
from mercurial.revlogutils import sidedata


def wrapaddrevision(
    orig, self, text, transaction, link, p1, p2, *args, **kwargs
):
    if kwargs.get('sidedata') is None:
        kwargs['sidedata'] = {}
    sd = kwargs['sidedata']
    ## let's store some arbitrary data just for testing
    # text length
    sd[sidedata.SD_TEST1] = struct.pack('>I', len(text))
    # and sha2 hashes
    sha256 = hashlib.sha256(text).digest()
    sd[sidedata.SD_TEST2] = struct.pack('>32s', sha256)
    return orig(self, text, transaction, link, p1, p2, *args, **kwargs)


def wrap_revisiondata(orig, self, nodeorrev, *args, **kwargs):
    text = orig(self, nodeorrev, *args, **kwargs)
    sd = self.sidedata(nodeorrev)
    if getattr(self, 'sidedatanocheck', False):
        return text
    if self.hassidedata:
        return text
    if nodeorrev != nullrev and nodeorrev != self.nullid:
        cat1 = sd.get(sidedata.SD_TEST1)
        if cat1 is not None and len(text) != struct.unpack('>I', cat1)[0]:
            raise RuntimeError('text size mismatch')
        expected = sd.get(sidedata.SD_TEST2)
        got = hashlib.sha256(text).digest()
        if expected is not None and got != expected:
            raise RuntimeError('sha256 mismatch')
    return text


def wrapget_sidedata_helpers(orig, srcrepo, dstrepo):
    repo, computers, removers = orig(srcrepo, dstrepo)
    assert not computers and not removers  # deal with composition later
    addedreqs = dstrepo.requirements - srcrepo.requirements

    if requirements.REVLOGV2_REQUIREMENT in addedreqs:

        def computer(repo, revlog, rev, old_sidedata):
            assert not old_sidedata  # not supported yet
            update = {}
            revlog.sidedatanocheck = True
            try:
                text = revlog.revision(rev)
            finally:
                del revlog.sidedatanocheck
            ## let's store some arbitrary data just for testing
            # text length
            update[sidedata.SD_TEST1] = struct.pack('>I', len(text))
            # and sha2 hashes
            sha256 = hashlib.sha256(text).digest()
            update[sidedata.SD_TEST2] = struct.pack('>32s', sha256)
            return update, (0, 0)

        srcrepo.register_sidedata_computer(
            constants.KIND_CHANGELOG,
            b"whatever",
            (sidedata.SD_TEST1, sidedata.SD_TEST2),
            computer,
            0,
        )
        dstrepo.register_wanted_sidedata(b"whatever")

    return sidedata.get_sidedata_helpers(srcrepo, dstrepo._wanted_sidedata)


def extsetup(ui):
    extensions.wrapfunction(revlog.revlog, 'addrevision', wrapaddrevision)
    extensions.wrapfunction(revlog.revlog, '_revisiondata', wrap_revisiondata)
    extensions.wrapfunction(
        upgrade_engine, 'get_sidedata_helpers', wrapget_sidedata_helpers
    )


def reposetup(ui, repo):
    # We don't register sidedata computers because we don't care within these
    # tests
    repo.register_wanted_sidedata(sidedata.SD_TEST1)
    repo.register_wanted_sidedata(sidedata.SD_TEST2)