view mercurial/ancestor.py @ 47205:603efb3845ba

pyoxidizer: support producing MSI installers

Newer versions of PyOxidizer have support for building WiX MSI
installers "natively." Essentially, you can script the definition
of your WiX installer via Starlark and PyOxidizer can invoke
WiX tools to produce the installer.

This commit teaches our PyOxidizer config file to produce MSI
installers similarly to how
`contrib/packaging/packging.py wix` would do it.

We had to make a very minor change to `mercurial.wxs` to reflect
different paths depending on who builds. This is because when
PyOxidizer builds WiX installers, it does so from an isolated
directory, not Mercurial's source directory. We simply copy the
files into the build environment so they are accessible.

After this change, running `pyoxidizer build msi` produces a nearly
identical install layout to what the previous method produces.
When I applied this series on top of the 5.8 tag, here is the
list of differences and explanations:

* docs/*.html files are missing from the new installer because the
  Python build environment doesn't have docutils.
* .pyd and .exe files differ, likely because I'm using a different
  Visual Studio toolchain on my local computer than the official build
  environment.
* Various .dist-info/ directories have different names. This is
  because older versions of PyOxidizer had buggy behavior and weren't
  properly normalizing package names in .dist-info/ directories. e.g.
  we went from `cached-property-1.5.2.dist-info` to
  `cached_property-1.5.2.dist-info`.
* Translations (.mo files) may be missing if gettext isn't in %Path%.
  This is because the packaging.py code installs gettext and ensures
  it can be found.
* Some *.dist-info/RECORD files vary due to SHA-256 content digest
  divergence due to build environment differences. (This should be
  harmless.)
* The new install layout ships a python3.dll because newer versions
  of PyOxidizer ship this file.
* The new install layout has a different vcruntime140.dll and also a
  vcruntime140_1.dll because newer versions of PyOxidizer ship a
  newer version of the Visual C++ Redistributable Runtime.

The new PyOxidizer functionality is not yet integrated with
packaging.py. This will come in a subsequent commit. So for now, the
new functionality introduced here is unused.

Differential Revision: https://phab.mercurial-scm.org/D10683

# ancestor.py - generic DAG ancestor algorithm for mercurial
#
# Copyright 2006 Olivia Mackall <[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.

from __future__ import absolute_import

import heapq

from .node import nullrev
from . import (
    dagop,
    policy,
    pycompat,
)

parsers = policy.importmod('parsers')


def commonancestorsheads(pfunc, *nodes):
    """Returns a set with the heads of all common ancestors of all nodes,
    heads(::nodes[0] and ::nodes[1] and ...) .

    pfunc must return a list of parent vertices for a given vertex.
    """
    if not isinstance(nodes, set):
        nodes = set(nodes)
    if nullrev in nodes:
        return set()
    if len(nodes) <= 1:
        return nodes

    allseen = (1 << len(nodes)) - 1
    seen = [0] * (max(nodes) + 1)
    for i, n in enumerate(nodes):
        seen[n] = 1 << i
    poison = 1 << (i + 1)

    gca = set()
    interesting = len(nodes)
    nv = len(seen) - 1
    while nv >= 0 and interesting:
        v = nv
        nv -= 1
        if not seen[v]:
            continue
        sv = seen[v]
        if sv < poison:
            interesting -= 1
            if sv == allseen:
                gca.add(v)
                sv |= poison
                if v in nodes:
                    # history is linear
                    return {v}
        if sv < poison:
            for p in pfunc(v):
                sp = seen[p]
                if p == nullrev:
                    continue
                if sp == 0:
                    seen[p] = sv
                    interesting += 1
                elif sp != sv:
                    seen[p] |= sv
        else:
            for p in pfunc(v):
                if p == nullrev:
                    continue
                sp = seen[p]
                if sp and sp < poison:
                    interesting -= 1
                seen[p] = sv
    return gca


def ancestors(pfunc, *orignodes):
    """
    Returns the common ancestors of a and b that are furthest from a
    root (as measured by longest path).

    pfunc must return a list of parent vertices for a given vertex.
    """

    def deepest(nodes):
        interesting = {}
        count = max(nodes) + 1
        depth = [0] * count
        seen = [0] * count
        mapping = []
        for (i, n) in enumerate(sorted(nodes)):
            depth[n] = 1
            b = 1 << i
            seen[n] = b
            interesting[b] = 1
            mapping.append((b, n))
        nv = count - 1
        while nv >= 0 and len(interesting) > 1:
            v = nv
            nv -= 1
            dv = depth[v]
            if dv == 0:
                continue
            sv = seen[v]
            for p in pfunc(v):
                if p == nullrev:
                    continue
                dp = depth[p]
                sp = seen[p]
                if dp <= dv:
                    depth[p] = dv + 1
                    if sp != sv:
                        interesting[sv] += 1
                        seen[p] = sv
                        if sp:
                            interesting[sp] -= 1
                            if interesting[sp] == 0:
                                del interesting[sp]
                elif dv == dp - 1:
                    nsp = sp | sv
                    if nsp == sp:
                        continue
                    seen[p] = nsp
                    interesting.setdefault(nsp, 0)
                    interesting[nsp] += 1
                    interesting[sp] -= 1
                    if interesting[sp] == 0:
                        del interesting[sp]
            interesting[sv] -= 1
            if interesting[sv] == 0:
                del interesting[sv]

        if len(interesting) != 1:
            return []

        k = 0
        for i in interesting:
            k |= i
        return {n for (i, n) in mapping if k & i}

    gca = commonancestorsheads(pfunc, *orignodes)

    if len(gca) <= 1:
        return gca
    return deepest(gca)


class incrementalmissingancestors(object):
    """persistent state used to calculate missing ancestors incrementally

    Although similar in spirit to lazyancestors below, this is a separate class
    because trying to support contains and missingancestors operations with the
    same internal data structures adds needless complexity."""

    def __init__(self, pfunc, bases):
        self.bases = set(bases)
        if not self.bases:
            self.bases.add(nullrev)
        self.pfunc = pfunc

    def hasbases(self):
        '''whether the common set has any non-trivial bases'''
        return self.bases and self.bases != {nullrev}

    def addbases(self, newbases):
        '''grow the ancestor set by adding new bases'''
        self.bases.update(newbases)

    def basesheads(self):
        return dagop.headrevs(self.bases, self.pfunc)

    def removeancestorsfrom(self, revs):
        '''remove all ancestors of bases from the set revs (in place)'''
        bases = self.bases
        pfunc = self.pfunc
        revs.difference_update(bases)
        # nullrev is always an ancestor
        revs.discard(nullrev)
        if not revs:
            return
        # anything in revs > start is definitely not an ancestor of bases
        # revs <= start needs to be investigated
        start = max(bases)
        keepcount = sum(1 for r in revs if r > start)
        if len(revs) == keepcount:
            # no revs to consider
            return

        for curr in pycompat.xrange(start, min(revs) - 1, -1):
            if curr not in bases:
                continue
            revs.discard(curr)
            bases.update(pfunc(curr))
            if len(revs) == keepcount:
                # no more potential revs to discard
                break

    def missingancestors(self, revs):
        """return all the ancestors of revs that are not ancestors of self.bases

        This may include elements from revs.

        Equivalent to the revset (::revs - ::self.bases). Revs are returned in
        revision number order, which is a topological order."""
        revsvisit = set(revs)
        basesvisit = self.bases
        pfunc = self.pfunc
        bothvisit = revsvisit.intersection(basesvisit)
        revsvisit.difference_update(bothvisit)
        if not revsvisit:
            return []

        start = max(max(revsvisit), max(basesvisit))
        # At this point, we hold the invariants that:
        # - revsvisit is the set of nodes we know are an ancestor of at least
        #   one of the nodes in revs
        # - basesvisit is the same for bases
        # - bothvisit is the set of nodes we know are ancestors of at least one
        #   of the nodes in revs and one of the nodes in bases. bothvisit and
        #   revsvisit are mutually exclusive, but bothvisit is a subset of
        #   basesvisit.
        # Now we walk down in reverse topo order, adding parents of nodes
        # already visited to the sets while maintaining the invariants. When a
        # node is found in both revsvisit and basesvisit, it is removed from
        # revsvisit and added to bothvisit. When revsvisit becomes empty, there
        # are no more ancestors of revs that aren't also ancestors of bases, so
        # exit.

        missing = []
        for curr in pycompat.xrange(start, nullrev, -1):
            if not revsvisit:
                break

            if curr in bothvisit:
                bothvisit.remove(curr)
                # curr's parents might have made it into revsvisit through
                # another path
                for p in pfunc(curr):
                    revsvisit.discard(p)
                    basesvisit.add(p)
                    bothvisit.add(p)
                continue

            if curr in revsvisit:
                missing.append(curr)
                revsvisit.remove(curr)
                thisvisit = revsvisit
                othervisit = basesvisit
            elif curr in basesvisit:
                thisvisit = basesvisit
                othervisit = revsvisit
            else:
                # not an ancestor of revs or bases: ignore
                continue

            for p in pfunc(curr):
                if p == nullrev:
                    pass
                elif p in othervisit or p in bothvisit:
                    # p is implicitly in thisvisit. This means p is or should be
                    # in bothvisit
                    revsvisit.discard(p)
                    basesvisit.add(p)
                    bothvisit.add(p)
                else:
                    # visit later
                    thisvisit.add(p)

        missing.reverse()
        return missing


# Extracted from lazyancestors.__iter__ to avoid a reference cycle
def _lazyancestorsiter(parentrevs, initrevs, stoprev, inclusive):
    seen = {nullrev}
    heappush = heapq.heappush
    heappop = heapq.heappop
    heapreplace = heapq.heapreplace
    see = seen.add

    if inclusive:
        visit = [-r for r in initrevs]
        seen.update(initrevs)
        heapq.heapify(visit)
    else:
        visit = []
        heapq.heapify(visit)
        for r in initrevs:
            p1, p2 = parentrevs(r)
            if p1 not in seen:
                heappush(visit, -p1)
                see(p1)
            if p2 not in seen:
                heappush(visit, -p2)
                see(p2)

    while visit:
        current = -visit[0]
        if current < stoprev:
            break
        yield current
        # optimize out heapq operation if p1 is known to be the next highest
        # revision, which is quite common in linear history.
        p1, p2 = parentrevs(current)
        if p1 not in seen:
            if current - p1 == 1:
                visit[0] = -p1
            else:
                heapreplace(visit, -p1)
            see(p1)
        else:
            heappop(visit)
        if p2 not in seen:
            heappush(visit, -p2)
            see(p2)


class lazyancestors(object):
    def __init__(self, pfunc, revs, stoprev=0, inclusive=False):
        """Create a new object generating ancestors for the given revs. Does
        not generate revs lower than stoprev.

        This is computed lazily starting from revs. The object supports
        iteration and membership.

        cl should be a changelog and revs should be an iterable. inclusive is
        a boolean that indicates whether revs should be included. Revs lower
        than stoprev will not be generated.

        Result does not include the null revision."""
        self._parentrevs = pfunc
        self._initrevs = [r for r in revs if r >= stoprev]
        self._stoprev = stoprev
        self._inclusive = inclusive

        self._containsseen = set()
        self._containsiter = _lazyancestorsiter(
            self._parentrevs, self._initrevs, self._stoprev, self._inclusive
        )

    def __nonzero__(self):
        """False if the set is empty, True otherwise."""
        try:
            next(iter(self))
            return True
        except StopIteration:
            return False

    __bool__ = __nonzero__

    def __iter__(self):
        """Generate the ancestors of _initrevs in reverse topological order.

        If inclusive is False, yield a sequence of revision numbers starting
        with the parents of each revision in revs, i.e., each revision is
        *not* considered an ancestor of itself. Results are emitted in reverse
        revision number order. That order is also topological: a child is
        always emitted before its parent.

        If inclusive is True, the source revisions are also yielded. The
        reverse revision number order is still enforced."""
        return _lazyancestorsiter(
            self._parentrevs, self._initrevs, self._stoprev, self._inclusive
        )

    def __contains__(self, target):
        """Test whether target is an ancestor of self._initrevs."""
        seen = self._containsseen
        if target in seen:
            return True
        iter = self._containsiter
        if iter is None:
            # Iterator exhausted
            return False
        # Only integer target is valid, but some callers expect 'None in self'
        # to be False. So we explicitly allow it.
        if target is None:
            return False

        see = seen.add
        try:
            while True:
                rev = next(iter)
                see(rev)
                if rev == target:
                    return True
                if rev < target:
                    return False
        except StopIteration:
            # Set to None to indicate fast-path can be used next time, and to
            # free up memory.
            self._containsiter = None
            return False