hgext/remotefilelog/contentstore.py
author Augie Fackler <augie@google.com>
Sun, 06 Oct 2019 09:48:39 -0400
changeset 43077 687b865b95ad
parent 43076 2372284d9457
child 43089 c59eb1560c44
permissions -rw-r--r--
formatting: byteify all mercurial/ and hgext/ string literals Done with python3.7 contrib/byteify-strings.py -i $(hg files 'set:mercurial/**.py - mercurial/thirdparty/** + hgext/**.py - hgext/fsmonitor/pywatchman/** - mercurial/__init__.py') black -l 80 -t py33 -S $(hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**" - hgext/fsmonitor/pywatchman/**') # skip-blame mass-reformatting only Differential Revision: https://phab.mercurial-scm.org/D6972
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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from __future__ import absolute_import
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import threading
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from mercurial.node import hex, nullid
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from mercurial import (
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    mdiff,
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    pycompat,
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    revlog,
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)
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from . import (
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    basestore,
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    constants,
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    shallowutil,
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)
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class ChainIndicies(object):
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    """A static class for easy reference to the delta chain indicies.
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    """
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    # The filename of this revision delta
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    NAME = 0
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    # The mercurial file node for this revision delta
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    NODE = 1
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    # The filename of the delta base's revision. This is useful when delta
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    # between different files (like in the case of a move or copy, we can delta
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    # against the original file content).
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    BASENAME = 2
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    # The mercurial file node for the delta base revision. This is the nullid if
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    # this delta is a full text.
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    BASENODE = 3
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    # The actual delta or full text data.
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    DATA = 4
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class unioncontentstore(basestore.baseunionstore):
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    def __init__(self, *args, **kwargs):
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        super(unioncontentstore, self).__init__(*args, **kwargs)
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        self.stores = args
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        self.writestore = kwargs.get(r'writestore')
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        # If allowincomplete==True then the union store can return partial
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        # delta chains, otherwise it will throw a KeyError if a full
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        # deltachain can't be found.
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        self.allowincomplete = kwargs.get(r'allowincomplete', False)
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    def get(self, name, node):
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        """Fetches the full text revision contents of the given name+node pair.
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        If the full text doesn't exist, throws a KeyError.
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        Under the hood, this uses getdeltachain() across all the stores to build
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        up a full chain to produce the full text.
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        """
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        chain = self.getdeltachain(name, node)
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        if chain[-1][ChainIndicies.BASENODE] != nullid:
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            # If we didn't receive a full chain, throw
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            raise KeyError((name, hex(node)))
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        # The last entry in the chain is a full text, so we start our delta
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        # applies with that.
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        fulltext = chain.pop()[ChainIndicies.DATA]
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        text = fulltext
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        while chain:
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            delta = chain.pop()[ChainIndicies.DATA]
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            text = mdiff.patches(text, [delta])
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        return text
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    @basestore.baseunionstore.retriable
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    def getdelta(self, name, node):
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        """Return the single delta entry for the given name/node pair.
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        """
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        for store in self.stores:
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            try:
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                return store.getdelta(name, node)
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            except KeyError:
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                pass
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        raise KeyError((name, hex(node)))
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    def getdeltachain(self, name, node):
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        """Returns the deltachain for the given name/node pair.
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        Returns an ordered list of:
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          [(name, node, deltabasename, deltabasenode, deltacontent),...]
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        where the chain is terminated by a full text entry with a nullid
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        deltabasenode.
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        """
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        chain = self._getpartialchain(name, node)
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        while chain[-1][ChainIndicies.BASENODE] != nullid:
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            x, x, deltabasename, deltabasenode, x = chain[-1]
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            try:
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                morechain = self._getpartialchain(deltabasename, deltabasenode)
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                chain.extend(morechain)
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            except KeyError:
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                # If we allow incomplete chains, don't throw.
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                if not self.allowincomplete:
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                    raise
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                break
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        return chain
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    @basestore.baseunionstore.retriable
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    def getmeta(self, name, node):
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        """Returns the metadata dict for given node."""
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        for store in self.stores:
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            try:
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                return store.getmeta(name, node)
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            except KeyError:
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                pass
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        raise KeyError((name, hex(node)))
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    def getmetrics(self):
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        metrics = [s.getmetrics() for s in self.stores]
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        return shallowutil.sumdicts(*metrics)
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    @basestore.baseunionstore.retriable
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    def _getpartialchain(self, name, node):
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        """Returns a partial delta chain for the given name/node pair.
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        A partial chain is a chain that may not be terminated in a full-text.
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        """
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        for store in self.stores:
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            try:
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                return store.getdeltachain(name, node)
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            except KeyError:
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                pass
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        raise KeyError((name, hex(node)))
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    def add(self, name, node, data):
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        raise RuntimeError(
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            b"cannot add content only to remotefilelog " b"contentstore"
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        )
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    def getmissing(self, keys):
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        missing = keys
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        for store in self.stores:
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            if missing:
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                missing = store.getmissing(missing)
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        return missing
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    def addremotefilelognode(self, name, node, data):
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        if self.writestore:
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            self.writestore.addremotefilelognode(name, node, data)
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        else:
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            raise RuntimeError(b"no writable store configured")
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    def markledger(self, ledger, options=None):
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        for store in self.stores:
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            store.markledger(ledger, options)
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class remotefilelogcontentstore(basestore.basestore):
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    def __init__(self, *args, **kwargs):
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        super(remotefilelogcontentstore, self).__init__(*args, **kwargs)
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        self._threaddata = threading.local()
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    def get(self, name, node):
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        # return raw revision text
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        data = self._getdata(name, node)
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        offset, size, flags = shallowutil.parsesizeflags(data)
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        content = data[offset : offset + size]
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        ancestormap = shallowutil.ancestormap(data)
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        p1, p2, linknode, copyfrom = ancestormap[node]
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        copyrev = None
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        if copyfrom:
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            copyrev = hex(p1)
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        self._updatemetacache(node, size, flags)
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        # lfs tracks renames in its own metadata, remove hg copy metadata,
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        # because copy metadata will be re-added by lfs flag processor.
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        if flags & revlog.REVIDX_EXTSTORED:
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            copyrev = copyfrom = None
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        revision = shallowutil.createrevlogtext(content, copyfrom, copyrev)
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        return revision
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    def getdelta(self, name, node):
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        # Since remotefilelog content stores only contain full texts, just
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        # return that.
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        revision = self.get(name, node)
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        return revision, name, nullid, self.getmeta(name, node)
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    def getdeltachain(self, name, node):
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        # Since remotefilelog content stores just contain full texts, we return
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        # a fake delta chain that just consists of a single full text revision.
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        # The nullid in the deltabasenode slot indicates that the revision is a
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        # fulltext.
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        revision = self.get(name, node)
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        return [(name, node, None, nullid, revision)]
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    def getmeta(self, name, node):
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        self._sanitizemetacache()
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        if node != self._threaddata.metacache[0]:
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            data = self._getdata(name, node)
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            offset, size, flags = shallowutil.parsesizeflags(data)
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            self._updatemetacache(node, size, flags)
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        return self._threaddata.metacache[1]
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    def add(self, name, node, data):
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        raise RuntimeError(
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            b"cannot add content only to remotefilelog " b"contentstore"
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        )
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    def _sanitizemetacache(self):
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        metacache = getattr(self._threaddata, 'metacache', None)
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        if metacache is None:
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            self._threaddata.metacache = (None, None)  # (node, meta)
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    def _updatemetacache(self, node, size, flags):
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        self._sanitizemetacache()
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        if node == self._threaddata.metacache[0]:
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            return
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        meta = {constants.METAKEYFLAG: flags, constants.METAKEYSIZE: size}
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        self._threaddata.metacache = (node, meta)
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class remotecontentstore(object):
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    def __init__(self, ui, fileservice, shared):
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        self._fileservice = fileservice
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        # type(shared) is usually remotefilelogcontentstore
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        self._shared = shared
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    def get(self, name, node):
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        self._fileservice.prefetch(
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            [(name, hex(node))], force=True, fetchdata=True
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        )
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        return self._shared.get(name, node)
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    def getdelta(self, name, node):
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        revision = self.get(name, node)
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        return revision, name, nullid, self._shared.getmeta(name, node)
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    def getdeltachain(self, name, node):
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        # Since our remote content stores just contain full texts, we return a
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        # fake delta chain that just consists of a single full text revision.
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        # The nullid in the deltabasenode slot indicates that the revision is a
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        # fulltext.
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        revision = self.get(name, node)
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        return [(name, node, None, nullid, revision)]
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    def getmeta(self, name, node):
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        self._fileservice.prefetch(
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            [(name, hex(node))], force=True, fetchdata=True
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        )
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        return self._shared.getmeta(name, node)
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    def add(self, name, node, data):
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        raise RuntimeError(b"cannot add to a remote store")
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    def getmissing(self, keys):
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        return keys
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    def markledger(self, ledger, options=None):
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        pass
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class manifestrevlogstore(object):
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    def __init__(self, repo):
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        self._store = repo.store
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        self._svfs = repo.svfs
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        self._revlogs = dict()
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        self._cl = revlog.revlog(self._svfs, b'00changelog.i')
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        self._repackstartlinkrev = 0
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    def get(self, name, node):
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        return self._revlog(name).rawdata(node)
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    def getdelta(self, name, node):
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        revision = self.get(name, node)
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        return revision, name, nullid, self.getmeta(name, node)
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    def getdeltachain(self, name, node):
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        revision = self.get(name, node)
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        return [(name, node, None, nullid, revision)]
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    def getmeta(self, name, node):
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        rl = self._revlog(name)
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        rev = rl.rev(node)
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        return {
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            constants.METAKEYFLAG: rl.flags(rev),
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            constants.METAKEYSIZE: rl.rawsize(rev),
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        }
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    def getancestors(self, name, node, known=None):
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        if known is None:
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            known = set()
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        if node in known:
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            return []
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        rl = self._revlog(name)
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        ancestors = {}
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        missing = set((node,))
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        for ancrev in rl.ancestors([rl.rev(node)], inclusive=True):
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            ancnode = rl.node(ancrev)
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            missing.discard(ancnode)
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            p1, p2 = rl.parents(ancnode)
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            if p1 != nullid and p1 not in known:
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                missing.add(p1)
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            if p2 != nullid and p2 not in known:
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                missing.add(p2)
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            linknode = self._cl.node(rl.linkrev(ancrev))
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            ancestors[rl.node(ancrev)] = (p1, p2, linknode, b'')
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            if not missing:
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                break
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        return ancestors
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    def getnodeinfo(self, name, node):
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        cl = self._cl
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        rl = self._revlog(name)
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        parents = rl.parents(node)
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        linkrev = rl.linkrev(rl.rev(node))
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        return (parents[0], parents[1], cl.node(linkrev), None)
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    def add(self, *args):
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        raise RuntimeError(b"cannot add to a revlog store")
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    def _revlog(self, name):
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        rl = self._revlogs.get(name)
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        if rl is None:
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            revlogname = b'00manifesttree.i'
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            if name != b'':
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                revlogname = b'meta/%s/00manifest.i' % name
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            rl = revlog.revlog(self._svfs, revlogname)
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            self._revlogs[name] = rl
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        return rl
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    def getmissing(self, keys):
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        missing = []
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        for name, node in keys:
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            mfrevlog = self._revlog(name)
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            if node not in mfrevlog.nodemap:
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                missing.append((name, node))
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        return missing
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    def setrepacklinkrevrange(self, startrev, endrev):
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        self._repackstartlinkrev = startrev
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        self._repackendlinkrev = endrev
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   352
    def markledger(self, ledger, options=None):
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   353
        if options and options.get(constants.OPTION_PACKSONLY):
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diff changeset
   354
            return
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   355
        treename = b''
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parents: 43076
diff changeset
   356
        rl = revlog.revlog(self._svfs, b'00manifesttree.i')
40495
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parents:
diff changeset
   357
        startlinkrev = self._repackstartlinkrev
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parents:
diff changeset
   358
        endlinkrev = self._repackendlinkrev
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parents:
diff changeset
   359
        for rev in pycompat.xrange(len(rl) - 1, -1, -1):
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parents:
diff changeset
   360
            linkrev = rl.linkrev(rev)
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parents:
diff changeset
   361
            if linkrev < startlinkrev:
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parents:
diff changeset
   362
                break
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Augie Fackler <augie@google.com>
parents:
diff changeset
   363
            if linkrev > endlinkrev:
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parents:
diff changeset
   364
                continue
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Augie Fackler <augie@google.com>
parents:
diff changeset
   365
            node = rl.node(rev)
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Augie Fackler <augie@google.com>
parents:
diff changeset
   366
            ledger.markdataentry(self, treename, node)
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Augie Fackler <augie@google.com>
parents:
diff changeset
   367
            ledger.markhistoryentry(self, treename, node)
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Augie Fackler <augie@google.com>
parents:
diff changeset
   368
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Augie Fackler <augie@google.com>
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diff changeset
   369
        for path, encoded, size in self._store.datafiles():
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diff changeset
   370
            if path[:5] != b'meta/' or path[-2:] != b'.i':
40495
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parents:
diff changeset
   371
                continue
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Augie Fackler <augie@google.com>
parents:
diff changeset
   372
43077
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parents: 43076
diff changeset
   373
            treename = path[5 : -len(b'/00manifest.i')]
40495
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Augie Fackler <augie@google.com>
parents:
diff changeset
   374
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Augie Fackler <augie@google.com>
parents:
diff changeset
   375
            rl = revlog.revlog(self._svfs, path)
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Augie Fackler <augie@google.com>
parents:
diff changeset
   376
            for rev in pycompat.xrange(len(rl) - 1, -1, -1):
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Augie Fackler <augie@google.com>
parents:
diff changeset
   377
                linkrev = rl.linkrev(rev)
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Augie Fackler <augie@google.com>
parents:
diff changeset
   378
                if linkrev < startlinkrev:
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Augie Fackler <augie@google.com>
parents:
diff changeset
   379
                    break
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Augie Fackler <augie@google.com>
parents:
diff changeset
   380
                if linkrev > endlinkrev:
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   381
                    continue
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Augie Fackler <augie@google.com>
parents:
diff changeset
   382
                node = rl.node(rev)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   383
                ledger.markdataentry(self, treename, node)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   384
                ledger.markhistoryentry(self, treename, node)
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   385
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   386
    def cleanup(self, ledger):
3a333a582d7b remotefilelog: import pruned-down remotefilelog extension from hg-experimental
Augie Fackler <augie@google.com>
parents:
diff changeset
   387
        pass