hgext/remotefilelog/remotefilelog.py
author Augie Fackler <augie@google.com>
Tue, 11 Feb 2020 00:44:59 -0500
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parent 44452 9d2b2df2c2ba
child 44570 9e63108123a4
permissions -rw-r--r--
git: skeleton of a new extension to _directly_ operate on git repos This is based in part of work I did years ago in hgit, but it's mostly new code since I'm using pygit2 instead of dulwich and the hg storage interfaces have improved. Some cleanup of old hgit code by Pulkit, which I greatly appreciate. test-git-interop.t does not cover a whole lot of cases, but it passes. It includes status, diff, making a new commit, and `hg annotate` working on the git repository. This is _not_ (yet) production quality code: this is an experiment. Known technical debt lurking in this implementation: * Writing bookmarks just totally ignores transactions. * The way progress is threaded down into the gitstore is awful. * Ideally we'd find a way to incrementally reindex DAGs. I'm not sure how to do that efficiently, so we might need a "known only fast-forwards" mode on the DAG indexer for use on `hg commit` and friends. * We don't even _try_ to do anything reasonable for `hg pull` or `hg push`. * Mercurial need an interface for the changelog type. Tests currently require git 2.24 as far as I'm aware: `git status` has some changed output that I didn't try and handle in a compatible way. This patch has produced some interesting cleanups, most recently on the manifest type. I expect continuing down this road will produce other meritorious cleanups throughout our code. Differential Revision: https://phab.mercurial-scm.org/D6734
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# remotefilelog.py - filelog implementation where filelog history is stored
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#                    remotely
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#
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# Copyright 2013 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import collections
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import os
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from mercurial.node import (
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    bin,
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    nullid,
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    wdirfilenodeids,
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    wdirid,
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)
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from mercurial.i18n import _
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from mercurial import (
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    ancestor,
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    error,
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    mdiff,
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    pycompat,
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    revlog,
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    util,
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)
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from mercurial.utils import storageutil
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from mercurial.revlogutils import flagutil
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from . import (
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    constants,
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    fileserverclient,
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    shallowutil,
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)
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class remotefilelognodemap(object):
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    def __init__(self, filename, store):
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        self._filename = filename
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        self._store = store
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    def __contains__(self, node):
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        missing = self._store.getmissing([(self._filename, node)])
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        return not bool(missing)
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    def __get__(self, node):
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        if node not in self:
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            raise KeyError(node)
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        return node
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class remotefilelog(object):
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    _generaldelta = True
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    _flagserrorclass = error.RevlogError
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    def __init__(self, opener, path, repo):
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        self.opener = opener
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        self.filename = path
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        self.repo = repo
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        self.nodemap = remotefilelognodemap(self.filename, repo.contentstore)
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        self.version = 1
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        self._flagprocessors = dict(flagutil.flagprocessors)
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    def read(self, node):
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        """returns the file contents at this node"""
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        t = self.revision(node)
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        if not t.startswith(b'\1\n'):
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            return t
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        s = t.index(b'\1\n', 2)
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        return t[s + 2 :]
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    def add(self, text, meta, transaction, linknode, p1=None, p2=None):
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        # hash with the metadata, like in vanilla filelogs
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        hashtext = shallowutil.createrevlogtext(
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            text, meta.get(b'copy'), meta.get(b'copyrev')
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        )
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        node = storageutil.hashrevisionsha1(hashtext, p1, p2)
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        return self.addrevision(
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            hashtext, transaction, linknode, p1, p2, node=node
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        )
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    def _createfileblob(self, text, meta, flags, p1, p2, node, linknode):
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        # text passed to "_createfileblob" does not include filelog metadata
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        header = shallowutil.buildfileblobheader(len(text), flags)
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        data = b"%s\0%s" % (header, text)
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        realp1 = p1
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        copyfrom = b""
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        if meta and b'copy' in meta:
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            copyfrom = meta[b'copy']
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            realp1 = bin(meta[b'copyrev'])
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        data += b"%s%s%s%s%s\0" % (node, realp1, p2, linknode, copyfrom)
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        visited = set()
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        pancestors = {}
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        queue = []
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        if realp1 != nullid:
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            p1flog = self
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            if copyfrom:
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                p1flog = remotefilelog(self.opener, copyfrom, self.repo)
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            pancestors.update(p1flog.ancestormap(realp1))
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            queue.append(realp1)
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            visited.add(realp1)
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        if p2 != nullid:
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            pancestors.update(self.ancestormap(p2))
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            queue.append(p2)
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            visited.add(p2)
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        ancestortext = b""
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        # add the ancestors in topological order
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        while queue:
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            c = queue.pop(0)
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            pa1, pa2, ancestorlinknode, pacopyfrom = pancestors[c]
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            pacopyfrom = pacopyfrom or b''
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            ancestortext += b"%s%s%s%s%s\0" % (
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                c,
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                pa1,
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                pa2,
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                ancestorlinknode,
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                pacopyfrom,
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            )
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            if pa1 != nullid and pa1 not in visited:
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                queue.append(pa1)
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                visited.add(pa1)
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            if pa2 != nullid and pa2 not in visited:
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                queue.append(pa2)
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                visited.add(pa2)
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        data += ancestortext
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        return data
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    def addrevision(
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        self,
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        text,
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        transaction,
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        linknode,
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        p1,
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        p2,
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        cachedelta=None,
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        node=None,
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        flags=revlog.REVIDX_DEFAULT_FLAGS,
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        sidedata=None,
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    ):
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        # text passed to "addrevision" includes hg filelog metadata header
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        if node is None:
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            node = storageutil.hashrevisionsha1(text, p1, p2)
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        if sidedata is None:
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            sidedata = {}
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        meta, metaoffset = storageutil.parsemeta(text)
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        rawtext, validatehash = flagutil.processflagswrite(
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            self, text, flags, sidedata=sidedata
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        )
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        return self.addrawrevision(
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            rawtext,
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            transaction,
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            linknode,
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            p1,
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            p2,
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            node,
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            flags,
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            cachedelta,
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            _metatuple=(meta, metaoffset),
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        )
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    def addrawrevision(
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        self,
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        rawtext,
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        transaction,
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        linknode,
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        p1,
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        p2,
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        node,
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        flags,
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        cachedelta=None,
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        _metatuple=None,
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    ):
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        if _metatuple:
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            # _metatuple: used by "addrevision" internally by remotefilelog
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            # meta was parsed confidently
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            meta, metaoffset = _metatuple
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        else:
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            # not from self.addrevision, but something else (repo._filecommit)
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            # calls addrawrevision directly. remotefilelog needs to get and
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            # strip filelog metadata.
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            # we don't have confidence about whether rawtext contains filelog
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            # metadata or not (flag processor could replace it), so we just
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            # parse it as best-effort.
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            # in LFS (flags != 0)'s case, the best way is to call LFS code to
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            # get the meta information, instead of storageutil.parsemeta.
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            meta, metaoffset = storageutil.parsemeta(rawtext)
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        if flags != 0:
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            # when flags != 0, be conservative and do not mangle rawtext, since
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            # a read flag processor expects the text not being mangled at all.
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            metaoffset = 0
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        if metaoffset:
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            # remotefilelog fileblob stores copy metadata in its ancestortext,
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            # not its main blob. so we need to remove filelog metadata
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            # (containing copy information) from text.
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            blobtext = rawtext[metaoffset:]
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        else:
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            blobtext = rawtext
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        data = self._createfileblob(
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            blobtext, meta, flags, p1, p2, node, linknode
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        )
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        self.repo.contentstore.addremotefilelognode(self.filename, node, data)
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        return node
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    def renamed(self, node):
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        ancestors = self.repo.metadatastore.getancestors(self.filename, node)
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        p1, p2, linknode, copyfrom = ancestors[node]
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        if copyfrom:
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            return (copyfrom, p1)
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        return False
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    def size(self, node):
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        """return the size of a given revision"""
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        return len(self.read(node))
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    rawsize = size
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    def cmp(self, node, text):
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        """compare text with a given file revision
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        returns True if text is different than what is stored.
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        """
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        if node == nullid:
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            return True
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        nodetext = self.read(node)
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        return nodetext != text
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    def __nonzero__(self):
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        return True
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    __bool__ = __nonzero__
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    def __len__(self):
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        if self.filename == b'.hgtags':
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            # The length of .hgtags is used to fast path tag checking.
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            # remotefilelog doesn't support .hgtags since the entire .hgtags
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            # history is needed.  Use the excludepattern setting to make
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            # .hgtags a normal filelog.
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            return 0
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        raise RuntimeError(b"len not supported")
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    def empty(self):
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        return False
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    def flags(self, node):
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        if isinstance(node, int):
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            raise error.ProgrammingError(
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                b'remotefilelog does not accept integer rev for flags'
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            )
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        store = self.repo.contentstore
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        return store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0)
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    def parents(self, node):
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        if node == nullid:
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            return nullid, nullid
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        ancestormap = self.repo.metadatastore.getancestors(self.filename, node)
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        p1, p2, linknode, copyfrom = ancestormap[node]
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        if copyfrom:
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            p1 = nullid
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        return p1, p2
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    def parentrevs(self, rev):
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        # TODO(augie): this is a node and should be a rev, but for now
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        # nothing in core seems to actually break.
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        return self.parents(rev)
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    def linknode(self, node):
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        ancestormap = self.repo.metadatastore.getancestors(self.filename, node)
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        p1, p2, linknode, copyfrom = ancestormap[node]
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        return linknode
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    def linkrev(self, node):
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        return self.repo.unfiltered().changelog.rev(self.linknode(node))
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    def emitrevisions(
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        self,
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        nodes,
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        nodesorder=None,
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        revisiondata=False,
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        assumehaveparentrevisions=False,
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        deltaprevious=False,
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        deltamode=None,
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    ):
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        # we don't use any of these parameters here
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        del nodesorder, revisiondata, assumehaveparentrevisions, deltaprevious
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        del deltamode
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   309
        prevnode = None
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        for node in nodes:
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            p1, p2 = self.parents(node)
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            if prevnode is None:
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                basenode = prevnode = p1
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            if basenode == node:
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                basenode = nullid
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            if basenode != nullid:
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                revision = None
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                delta = self.revdiff(basenode, node)
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   319
            else:
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   320
                revision = self.rawdata(node)
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                delta = None
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   322
            yield revlog.revlogrevisiondelta(
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   323
                node=node,
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   324
                p1node=p1,
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   325
                p2node=p2,
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                linknode=self.linknode(node),
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                basenode=basenode,
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   328
                flags=self.flags(node),
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   329
                baserevisionsize=None,
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   330
                revision=revision,
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   331
                delta=delta,
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   332
            )
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   333
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   334
    def revdiff(self, node1, node2):
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   335
        return mdiff.textdiff(self.rawdata(node1), self.rawdata(node2))
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   336
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    def lookup(self, node):
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   338
        if len(node) == 40:
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   339
            node = bin(node)
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   340
        if len(node) != 20:
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   341
            raise error.LookupError(
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                node, self.filename, _(b'invalid lookup input')
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   343
            )
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        return node
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    def rev(self, node):
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        # This is a hack to make TortoiseHG work.
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   349
        return node
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    def node(self, rev):
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        # This is a hack.
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   353
        if isinstance(rev, int):
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   354
            raise error.ProgrammingError(
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   355
                b'remotefilelog does not convert integer rev to node'
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   356
            )
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   357
        return rev
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   358
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   359
    def _processflags(self, text, flags, operation, raw=False):
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   360
        """deprecated entry point to access flag processors"""
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        msg = b'_processflag(...) use the specialized variant'
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   362
        util.nouideprecwarn(msg, b'5.2', stacklevel=2)
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diff changeset
   363
        if raw:
01304095256c flagprocessors: directly duplicate the deprecated layer back into revlog
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42991
diff changeset
   364
            return text, flagutil.processflagsraw(self, text, flags)
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   365
        elif operation == b'read':
42993
01304095256c flagprocessors: directly duplicate the deprecated layer back into revlog
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42991
diff changeset
   366
            return flagutil.processflagsread(self, text, flags)
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   367
        else:  # write operation
42993
01304095256c flagprocessors: directly duplicate the deprecated layer back into revlog
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42991
diff changeset
   368
            return flagutil.processflagswrite(self, text, flags)
01304095256c flagprocessors: directly duplicate the deprecated layer back into revlog
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42991
diff changeset
   369
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   370
    def revision(self, node, raw=False):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   371
        """returns the revlog contents at this node.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   372
        this includes the meta data traditionally included in file revlogs.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   373
        this is generally only used for bundling and communicating with vanilla
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   374
        hg clients.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   375
        """
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   376
        if node == nullid:
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   377
            return b""
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   378
        if len(node) != 20:
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   379
            raise error.LookupError(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   380
                node, self.filename, _(b'invalid revision input')
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   381
            )
42095
864f9f63d3ed remotefilelog: correctly reject wdir filenodes
Augie Fackler <augie@google.com>
parents: 41365
diff changeset
   382
        if node == wdirid or node in wdirfilenodeids:
864f9f63d3ed remotefilelog: correctly reject wdir filenodes
Augie Fackler <augie@google.com>
parents: 41365
diff changeset
   383
            raise error.WdirUnsupported
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   384
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   385
        store = self.repo.contentstore
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   386
        rawtext = store.get(self.filename, node)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   387
        if raw:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   388
            return rawtext
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   389
        flags = store.getmeta(self.filename, node).get(constants.METAKEYFLAG, 0)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   390
        if flags == 0:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   391
            return rawtext
42991
eb5048f8c533 flagprocessors: make `processflagsread` a module level function
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42990
diff changeset
   392
        return flagutil.processflagsread(self, rawtext, flags)[0]
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   393
42725
7492899c6fc6 rawdata: implement the method for `remotefilelog` too
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42095
diff changeset
   394
    def rawdata(self, node):
7492899c6fc6 rawdata: implement the method for `remotefilelog` too
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42095
diff changeset
   395
        return self.revision(node, raw=False)
7492899c6fc6 rawdata: implement the method for `remotefilelog` too
Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42095
diff changeset
   396
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   397
    def _read(self, id):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   398
        """reads the raw file blob from disk, cache, or server"""
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   399
        fileservice = self.repo.fileservice
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   400
        localcache = fileservice.localcache
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   401
        cachekey = fileserverclient.getcachekey(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   402
            self.repo.name, self.filename, id
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   403
        )
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   404
        try:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   405
            return localcache.read(cachekey)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   406
        except KeyError:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   407
            pass
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   408
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   409
        localkey = fileserverclient.getlocalkey(self.filename, id)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   410
        localpath = os.path.join(self.localpath, localkey)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   411
        try:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   412
            return shallowutil.readfile(localpath)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   413
        except IOError:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   414
            pass
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   415
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   416
        fileservice.prefetch([(self.filename, id)])
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   417
        try:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   418
            return localcache.read(cachekey)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   419
        except KeyError:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   420
            pass
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   421
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   422
        raise error.LookupError(id, self.filename, _(b'no node'))
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   423
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   424
    def ancestormap(self, node):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   425
        return self.repo.metadatastore.getancestors(self.filename, node)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   426
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   427
    def ancestor(self, a, b):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   428
        if a == nullid or b == nullid:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   429
            return nullid
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   430
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   431
        revmap, parentfunc = self._buildrevgraph(a, b)
44452
9d2b2df2c2ba cleanup: run pyupgrade on our source tree to clean up varying things
Augie Fackler <augie@google.com>
parents: 43105
diff changeset
   432
        nodemap = {v: k for (k, v) in pycompat.iteritems(revmap)}
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   433
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   434
        ancs = ancestor.ancestors(parentfunc, revmap[a], revmap[b])
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   435
        if ancs:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   436
            # choose a consistent winner when there's a tie
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   437
            return min(map(nodemap.__getitem__, ancs))
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   438
        return nullid
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   439
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   440
    def commonancestorsheads(self, a, b):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   441
        """calculate all the heads of the common ancestors of nodes a and b"""
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   442
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   443
        if a == nullid or b == nullid:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   444
            return nullid
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   445
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   446
        revmap, parentfunc = self._buildrevgraph(a, b)
44452
9d2b2df2c2ba cleanup: run pyupgrade on our source tree to clean up varying things
Augie Fackler <augie@google.com>
parents: 43105
diff changeset
   447
        nodemap = {v: k for (k, v) in pycompat.iteritems(revmap)}
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   448
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   449
        ancs = ancestor.commonancestorsheads(parentfunc, revmap[a], revmap[b])
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   450
        return map(nodemap.__getitem__, ancs)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   451
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   452
    def _buildrevgraph(self, a, b):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   453
        """Builds a numeric revision graph for the given two nodes.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   454
        Returns a node->rev map and a rev->[revs] parent function.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   455
        """
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   456
        amap = self.ancestormap(a)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   457
        bmap = self.ancestormap(b)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   458
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   459
        # Union the two maps
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   460
        parentsmap = collections.defaultdict(list)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   461
        allparents = set()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   462
        for mapping in (amap, bmap):
43105
649d3ac37a12 py3: define and use pycompat.iteritems() for hgext/
Gregory Szorc <gregory.szorc@gmail.com>
parents: 43077
diff changeset
   463
            for node, pdata in pycompat.iteritems(mapping):
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   464
                parents = parentsmap[node]
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   465
                p1, p2, linknode, copyfrom = pdata
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   466
                # Don't follow renames (copyfrom).
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   467
                # remotefilectx.ancestor does that.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   468
                if p1 != nullid and not copyfrom:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   469
                    parents.append(p1)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   470
                    allparents.add(p1)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   471
                if p2 != nullid:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   472
                    parents.append(p2)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   473
                    allparents.add(p2)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   474
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   475
        # Breadth first traversal to build linkrev graph
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   476
        parentrevs = collections.defaultdict(list)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   477
        revmap = {}
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   478
        queue = collections.deque(
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   479
            ((None, n) for n in parentsmap if n not in allparents)
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 42995
diff changeset
   480
        )
40495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   481
        while queue:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   482
            prevrev, current = queue.pop()
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   483
            if current in revmap:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   484
                if prevrev:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   485
                    parentrevs[prevrev].append(revmap[current])
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   486
                continue
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   487
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   488
            # Assign linkrevs in reverse order, so start at
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   489
            # len(parentsmap) and work backwards.
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   490
            currentrev = len(parentsmap) - len(revmap) - 1
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   491
            revmap[current] = currentrev
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   492
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   493
            if prevrev:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   494
                parentrevs[prevrev].append(currentrev)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   495
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   496
            for parent in parentsmap.get(current):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   497
                queue.appendleft((currentrev, parent))
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   498
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   499
        return revmap, parentrevs.__getitem__
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   500
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   501
    def strip(self, minlink, transaction):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   502
        pass
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   503
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   504
    # misc unused things
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   505
    def files(self):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   506
        return []
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   507
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   508
    def checksize(self):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   509
        return 0, 0