mirror of
https://github.com/facebook/sapling.git
synced 2024-10-10 08:47:12 +03:00
d87789e3e7
Summary: Previously we were storing the changelog on the manifestlog and using it to resolve linkrevs before serializing them. It turns out the changelog can be invalidated at a different rate than the manifestlog, so we could encounter issues where the manifestlog held a reference to the old changelog. To fix this, let's hold a reference to the repo and access the changelog from there when we need it. This introduces a circular reference between the manifestlog and the repo, but it's probably fine for now until we can get rid of the need for changelog invalidation. Reviewed By: singhsrb Differential Revision: D7360321 fbshipit-source-id: 2317c7fcd6b307a50b64f0c5df97dda2955f3e21
645 lines
23 KiB
Python
645 lines
23 KiB
Python
from __future__ import absolute_import
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import hashlib, struct
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from mercurial import error, util
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from mercurial.node import hex, nullid
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from . import (
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basepack,
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constants,
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shallowutil,
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)
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# (filename hash, offset, size)
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INDEXFORMAT0 = '!20sQQ'
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INDEXENTRYLENGTH0 = struct.calcsize(INDEXFORMAT0)
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INDEXFORMAT1 = '!20sQQII'
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INDEXENTRYLENGTH1 = struct.calcsize(INDEXFORMAT1)
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NODELENGTH = 20
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NODEINDEXFORMAT = '!20sQ'
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NODEINDEXENTRYLENGTH = struct.calcsize(NODEINDEXFORMAT)
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# (node, p1, p2, linknode)
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PACKFORMAT = "!20s20s20s20sH"
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PACKENTRYLENGTH = 82
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ENTRYCOUNTSIZE = 4
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INDEXSUFFIX = '.histidx'
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PACKSUFFIX = '.histpack'
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ANC_NODE = 0
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ANC_P1NODE = 1
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ANC_P2NODE = 2
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ANC_LINKNODE = 3
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ANC_COPYFROM = 4
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try:
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xrange(0)
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except NameError:
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xrange = range
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class historypackstore(basepack.basepackstore):
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INDEXSUFFIX = INDEXSUFFIX
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PACKSUFFIX = PACKSUFFIX
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def getpack(self, path):
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return historypack(path)
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def getancestors(self, name, node, known=None):
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for pack in self.packs:
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try:
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return pack.getancestors(name, node, known=known)
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except KeyError:
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pass
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for pack in self.refresh():
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try:
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return pack.getancestors(name, node, known=known)
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except KeyError:
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pass
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raise KeyError((name, node))
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def getnodeinfo(self, name, node):
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for pack in self.packs:
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try:
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return pack.getnodeinfo(name, node)
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except KeyError:
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pass
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for pack in self.refresh():
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try:
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return pack.getnodeinfo(name, node)
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except KeyError:
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pass
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raise KeyError((name, node))
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def add(self, filename, node, p1, p2, linknode, copyfrom):
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raise RuntimeError("cannot add to historypackstore (%s:%s)"
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% (filename, hex(node)))
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class historypack(basepack.basepack):
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INDEXSUFFIX = INDEXSUFFIX
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PACKSUFFIX = PACKSUFFIX
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SUPPORTED_VERSIONS = [0, 1]
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def __init__(self, path):
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super(historypack, self).__init__(path)
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if self.VERSION == 0:
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self.INDEXFORMAT = INDEXFORMAT0
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self.INDEXENTRYLENGTH = INDEXENTRYLENGTH0
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else:
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self.INDEXFORMAT = INDEXFORMAT1
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self.INDEXENTRYLENGTH = INDEXENTRYLENGTH1
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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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try:
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self._findnode(name, node)
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except KeyError:
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missing.append((name, node))
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return missing
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def getancestors(self, name, node, known=None):
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"""Returns as many ancestors as we're aware of.
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return value: {
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node: (p1, p2, linknode, copyfrom),
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...
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}
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"""
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if known and node in known:
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return []
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ancestors = self._getancestors(name, node, known=known)
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results = {}
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for ancnode, p1, p2, linknode, copyfrom in ancestors:
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results[ancnode] = (p1, p2, linknode, copyfrom)
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if not results:
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raise KeyError((name, node))
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return results
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def getnodeinfo(self, name, node):
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# Drop the node from the tuple before returning, since the result should
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# just be (p1, p2, linknode, copyfrom)
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return self._findnode(name, node)[1:]
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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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section = self._findsection(name)
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filename, offset, size, nodeindexoffset, nodeindexsize = section
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pending = set((node,))
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o = 0
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while o < size:
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if not pending:
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break
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entry, copyfrom = self._readentry(offset + o)
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o += PACKENTRYLENGTH
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if copyfrom:
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o += len(copyfrom)
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ancnode = entry[ANC_NODE]
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if ancnode in pending:
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pending.remove(ancnode)
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p1node = entry[ANC_P1NODE]
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p2node = entry[ANC_P2NODE]
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if p1node != nullid and p1node not in known:
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pending.add(p1node)
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if p2node != nullid and p2node not in known:
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pending.add(p2node)
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yield (ancnode, p1node, p2node, entry[ANC_LINKNODE], copyfrom)
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def _readentry(self, offset):
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data = self._data
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entry = struct.unpack(PACKFORMAT, data[offset:offset + PACKENTRYLENGTH])
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copyfrom = None
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copyfromlen = entry[ANC_COPYFROM]
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if copyfromlen != 0:
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offset += PACKENTRYLENGTH
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copyfrom = data[offset:offset + copyfromlen]
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return entry, copyfrom
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def add(self, filename, node, p1, p2, linknode, copyfrom):
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raise RuntimeError("cannot add to historypack (%s:%s)" %
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(filename, hex(node)))
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def _findnode(self, name, node):
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if self.VERSION == 0:
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ancestors = self._getancestors(name, node)
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for ancnode, p1node, p2node, linknode, copyfrom in ancestors:
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if ancnode == node:
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return (ancnode, p1node, p2node, linknode, copyfrom)
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else:
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section = self._findsection(name)
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nodeindexoffset, nodeindexsize = section[3:]
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entry = self._bisect(node, nodeindexoffset,
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nodeindexoffset + nodeindexsize,
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NODEINDEXENTRYLENGTH)
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if entry is not None:
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node, offset = struct.unpack(NODEINDEXFORMAT, entry)
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entry, copyfrom = self._readentry(offset)
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# Drop the copyfromlen from the end of entry, and replace it
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# with the copyfrom string.
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return entry[:4] + (copyfrom,)
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raise KeyError("unable to find history for %s:%s" % (name, hex(node)))
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def _findsection(self, name):
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params = self.params
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namehash = hashlib.sha1(name).digest()
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fanoutkey = struct.unpack(params.fanoutstruct,
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namehash[:params.fanoutprefix])[0]
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fanout = self._fanouttable
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start = fanout[fanoutkey] + params.indexstart
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indexend = self._indexend
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for i in xrange(fanoutkey + 1, params.fanoutcount):
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end = fanout[i] + params.indexstart
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if end != start:
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break
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else:
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end = indexend
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entry = self._bisect(namehash, start, end, self.INDEXENTRYLENGTH)
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if not entry:
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raise KeyError(name)
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rawentry = struct.unpack(self.INDEXFORMAT, entry)
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if self.VERSION == 0:
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x, offset, size = rawentry
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nodeindexoffset = None
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nodeindexsize = None
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else:
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x, offset, size, nodeindexoffset, nodeindexsize = rawentry
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rawnamelen = self._index[nodeindexoffset:nodeindexoffset +
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constants.FILENAMESIZE]
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actualnamelen = struct.unpack('!H', rawnamelen)[0]
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nodeindexoffset += constants.FILENAMESIZE
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actualname = self._index[nodeindexoffset:nodeindexoffset +
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actualnamelen]
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if actualname != name:
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raise KeyError("found file name %s when looking for %s" %
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(actualname, name))
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nodeindexoffset += actualnamelen
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filenamelength = struct.unpack('!H', self._data[offset:offset +
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constants.FILENAMESIZE])[0]
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offset += constants.FILENAMESIZE
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actualname = self._data[offset:offset + filenamelength]
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offset += filenamelength
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if name != actualname:
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raise KeyError("found file name %s when looking for %s" %
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(actualname, name))
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# Skip entry list size
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offset += ENTRYCOUNTSIZE
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nodelistoffset = offset
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nodelistsize = (size - constants.FILENAMESIZE - filenamelength -
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ENTRYCOUNTSIZE)
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return (name, nodelistoffset, nodelistsize,
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nodeindexoffset, nodeindexsize)
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def _bisect(self, node, start, end, entrylen):
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# Bisect between start and end to find node
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origstart = start
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startnode = self._index[start:start + NODELENGTH]
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endnode = self._index[end:end + NODELENGTH]
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if startnode == node:
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return self._index[start:start + entrylen]
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elif endnode == node:
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return self._index[end:end + entrylen]
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else:
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while start < end - entrylen:
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mid = start + (end - start) / 2
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mid = mid - ((mid - origstart) % entrylen)
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midnode = self._index[mid:mid + NODELENGTH]
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if midnode == node:
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return self._index[mid:mid + entrylen]
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if node > midnode:
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start = mid
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startnode = midnode
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elif node < midnode:
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end = mid
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endnode = midnode
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return None
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def markledger(self, ledger, options=None):
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if options and options.get(constants.OPTION_LOOSEONLY):
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return
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for filename, node in self:
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ledger.markhistoryentry(self, filename, node)
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def cleanup(self, ledger):
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entries = ledger.sources.get(self, [])
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allkeys = set(self)
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repackedkeys = set((e.filename, e.node) for e in entries if
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e.historyrepacked)
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if len(allkeys - repackedkeys) == 0:
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if self.path not in ledger.created:
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util.unlinkpath(self.indexpath, ignoremissing=True)
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util.unlinkpath(self.packpath, ignoremissing=True)
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def __iter__(self):
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for f, n, x, x, x, x in self.iterentries():
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yield f, n
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def iterentries(self):
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# Start at 1 to skip the header
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offset = 1
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while offset < self.datasize:
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data = self._data
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# <2 byte len> + <filename>
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filenamelen = struct.unpack('!H', data[offset:offset +
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constants.FILENAMESIZE])[0]
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offset += constants.FILENAMESIZE
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filename = data[offset:offset + filenamelen]
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offset += filenamelen
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revcount = struct.unpack('!I', data[offset:offset +
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ENTRYCOUNTSIZE])[0]
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offset += ENTRYCOUNTSIZE
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for i in xrange(revcount):
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entry = struct.unpack(PACKFORMAT, data[offset:offset +
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PACKENTRYLENGTH])
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offset += PACKENTRYLENGTH
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copyfrom = data[offset:offset + entry[ANC_COPYFROM]]
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offset += entry[ANC_COPYFROM]
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yield (filename, entry[ANC_NODE], entry[ANC_P1NODE],
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entry[ANC_P2NODE], entry[ANC_LINKNODE], copyfrom)
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self._pagedin += PACKENTRYLENGTH
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# If we've read a lot of data from the mmap, free some memory.
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self.freememory()
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class mutablehistorypack(basepack.mutablebasepack):
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"""A class for constructing and serializing a histpack file and index.
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A history pack is a pair of files that contain the revision history for
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various file revisions in Mercurial. It contains only revision history (like
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parent pointers and linknodes), not any revision content information.
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It consists of two files, with the following format:
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.histpack
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The pack itself is a series of file revisions with some basic header
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information on each.
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datapack = <version: 1 byte>
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[<filesection>,...]
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filesection = <filename len: 2 byte unsigned int>
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<filename>
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<revision count: 4 byte unsigned int>
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[<revision>,...]
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revision = <node: 20 byte>
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<p1node: 20 byte>
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<p2node: 20 byte>
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<linknode: 20 byte>
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<copyfromlen: 2 byte>
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<copyfrom>
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The revisions within each filesection are stored in topological order
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(newest first). If a given entry has a parent from another file (a copy)
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then p1node is the node from the other file, and copyfrom is the
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filepath of the other file.
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.histidx
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The index file provides a mapping from filename to the file section in
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the histpack. In V1 it also contains sub-indexes for specific nodes
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within each file. It consists of three parts, the fanout, the file index
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and the node indexes.
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The file index is a list of index entries, sorted by filename hash (one
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per file section in the pack). Each entry has:
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- node (The 20 byte hash of the filename)
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- pack entry offset (The location of this file section in the histpack)
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- pack content size (The on-disk length of this file section's pack
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data)
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- node index offset (The location of the file's node index in the index
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file) [1]
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- node index size (the on-disk length of this file's node index) [1]
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The fanout is a quick lookup table to reduce the number of steps for
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bisecting the index. It is a series of 4 byte pointers to positions
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within the index. It has 2^16 entries, which corresponds to hash
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prefixes [00, 01, 02,..., FD, FE, FF]. Example: the pointer in slot 4F
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points to the index position of the first revision whose node starts
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with 4F. This saves log(2^16) bisect steps.
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dataidx = <fanouttable>
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<file count: 8 byte unsigned> [1]
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<fileindex>
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<node count: 8 byte unsigned> [1]
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[<nodeindex>,...] [1]
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fanouttable = [<index offset: 4 byte unsigned int>,...] (2^16 entries)
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fileindex = [<file index entry>,...]
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fileindexentry = <node: 20 byte>
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<pack file section offset: 8 byte unsigned int>
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<pack file section size: 8 byte unsigned int>
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<node index offset: 4 byte unsigned int> [1]
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<node index size: 4 byte unsigned int> [1]
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nodeindex = <filename>[<node index entry>,...] [1]
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filename = <filename len : 2 byte unsigned int><filename value> [1]
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nodeindexentry = <node: 20 byte> [1]
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<pack file node offset: 8 byte unsigned int> [1]
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[1]: new in version 1.
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"""
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INDEXSUFFIX = INDEXSUFFIX
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PACKSUFFIX = PACKSUFFIX
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SUPPORTED_VERSIONS = [0, 1]
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def __init__(self, ui, packpath, version=0, repo=None):
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"""Creates a mutable history pack for writing.
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If `repo` is provided, then pack.add() can be called with
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linkrev=REV and the linkrev will be converted to a linknode at
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serialization time. This allows callers to add entries without knowing
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what the linknode is just yet.
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"""
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# internal config: remotefilelog.historypackv1
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if version == 0 and ui.configbool('remotefilelog', 'historypackv1',
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False):
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version = 1
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super(mutablehistorypack, self).__init__(ui, packpath, version=version)
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self.files = {}
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self.entrylocations = {}
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self.fileentries = {}
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self.repo = repo
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if version == 0:
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self.INDEXFORMAT = INDEXFORMAT0
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self.INDEXENTRYLENGTH = INDEXENTRYLENGTH0
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else:
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self.INDEXFORMAT = INDEXFORMAT1
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self.INDEXENTRYLENGTH = INDEXENTRYLENGTH1
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self.NODEINDEXFORMAT = NODEINDEXFORMAT
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self.NODEINDEXENTRYLENGTH = NODEINDEXENTRYLENGTH
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def add(self, filename, node, p1, p2, linknode, copyfrom, linkrev=None):
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if linkrev is not None:
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if self.repo is None:
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msg = ("cannot specify a linkrev if repo was not "
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"provided to the mutablehistorypack")
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raise error.ProgrammingError(msg)
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if linknode is not None:
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raise error.ProgrammingError("cannot specify both linknode and "
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"linkrev")
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if linknode is None and linkrev is None:
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raise error.ProgrammingError("must specify either a linknode or a "
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"linkrev")
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copyfrom = copyfrom or ''
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copyfromlen = struct.pack('!H', len(copyfrom))
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entrymap = self.fileentries.setdefault(filename, {})
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entrymap[node] = (node, p1, p2, linknode, copyfromlen, copyfrom,
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linkrev)
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def _write(self):
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repo = self.repo
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for filename in sorted(self.fileentries):
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entrymap = self.fileentries[filename]
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sectionstart = self.packfp.tell()
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# Write the file section content
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def parentfunc(node):
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x, p1, p2, x, x, x, x = entrymap[node]
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parents = []
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if p1 != nullid:
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parents.append(p1)
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if p2 != nullid:
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parents.append(p2)
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return parents
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sortednodes = list(reversed(shallowutil.sortnodes(
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entrymap.iterkeys(),
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parentfunc)))
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# Write the file section header
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self.writeraw("%s%s%s" % (
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struct.pack('!H', len(filename)),
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filename,
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struct.pack('!I', len(sortednodes)),
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))
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sectionlen = constants.FILENAMESIZE + len(filename) + 4
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rawstrings = []
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# Record the node locations for the index
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locations = self.entrylocations.setdefault(filename, {})
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offset = sectionstart + sectionlen
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for node in sortednodes:
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locations[node] = offset
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value = entrymap[node]
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node, p1, p2, linknode, copyfromlen, copyfrom, linkrev = value
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if linkrev is not None:
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# repo will not be None because of the assertion in add
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linknode = repo.changelog.node(linkrev)
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if linknode == nullid:
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raise ValueError("attempting to add nullid linknode")
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raw = '%s%s%s%s%s%s' % (node, p1, p2, linknode, copyfromlen,
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copyfrom)
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rawstrings.append(raw)
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offset += len(raw)
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rawdata = ''.join(rawstrings)
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|
sectionlen += len(rawdata)
|
|
|
|
self.writeraw(rawdata)
|
|
|
|
# Record metadata for the index
|
|
self.files[filename] = (sectionstart, sectionlen)
|
|
node = hashlib.sha1(filename).digest()
|
|
self.entries[node] = node
|
|
|
|
def close(self, ledger=None):
|
|
if self._closed:
|
|
return
|
|
|
|
self._write()
|
|
|
|
return super(mutablehistorypack, self).close(ledger=ledger)
|
|
|
|
def createindex(self, nodelocations, indexoffset):
|
|
fileindexformat = self.INDEXFORMAT
|
|
fileindexlength = self.INDEXENTRYLENGTH
|
|
nodeindexformat = self.NODEINDEXFORMAT
|
|
nodeindexlength = self.NODEINDEXENTRYLENGTH
|
|
version = self.VERSION
|
|
|
|
files = ((hashlib.sha1(filename).digest(), filename, offset, size)
|
|
for filename, (offset, size) in self.files.iteritems())
|
|
files = sorted(files)
|
|
|
|
# node index is after file index size, file index, and node index size
|
|
indexlensize = struct.calcsize('!Q')
|
|
nodeindexoffset = (indexoffset + indexlensize +
|
|
(len(files) * fileindexlength) + indexlensize)
|
|
|
|
fileindexentries = []
|
|
nodeindexentries = []
|
|
nodecount = 0
|
|
for namehash, filename, offset, size in files:
|
|
# File section index
|
|
if version == 0:
|
|
rawentry = struct.pack(fileindexformat, namehash, offset, size)
|
|
else:
|
|
nodelocations = self.entrylocations[filename]
|
|
|
|
nodeindexsize = len(nodelocations) * nodeindexlength
|
|
|
|
rawentry = struct.pack(fileindexformat, namehash, offset, size,
|
|
nodeindexoffset, nodeindexsize)
|
|
# Node index
|
|
nodeindexentries.append(struct.pack(constants.FILENAMESTRUCT,
|
|
len(filename)) + filename)
|
|
nodeindexoffset += constants.FILENAMESIZE + len(filename)
|
|
|
|
for node, location in sorted(nodelocations.iteritems()):
|
|
nodeindexentries.append(struct.pack(nodeindexformat, node,
|
|
location))
|
|
nodecount += 1
|
|
|
|
nodeindexoffset += len(nodelocations) * nodeindexlength
|
|
|
|
fileindexentries.append(rawentry)
|
|
|
|
nodecountraw = ''
|
|
if version == 1:
|
|
nodecountraw = struct.pack('!Q', nodecount)
|
|
return (''.join(fileindexentries) + nodecountraw +
|
|
''.join(nodeindexentries))
|
|
|
|
def getancestors(self, name, node, known=None):
|
|
entrymap = self.fileentries.get(name)
|
|
if entrymap is None:
|
|
raise KeyError((name, hex(node)))
|
|
|
|
entry = entrymap.get(node)
|
|
if entry is not None:
|
|
enode, p1, p2, linknode, copyfromlen, copyfrom, linkrev = entry
|
|
if linkrev is not None:
|
|
linknode = nullid
|
|
if linkrev < len(self.repo.changelog):
|
|
linknode = self.repo.changelog.node(linkrev)
|
|
if linknode == nullid:
|
|
msg = ("attempting to read tree from mutablehistorypack "
|
|
"that can't resolve linkrev")
|
|
raise error.ProgrammingError(msg)
|
|
return {node: (p1, p2, linknode, copyfrom)}
|
|
|
|
raise KeyError((name, hex(node)))
|
|
|
|
def getnodeinfo(self, name, node):
|
|
return self.getancestors(name, node)[node]
|
|
|
|
def getmissing(self, keys):
|
|
missing = []
|
|
fileentries = self.fileentries
|
|
for name, node in keys:
|
|
entrymap = fileentries.get(name)
|
|
if node not in entrymap:
|
|
missing.append((name, node))
|
|
|
|
return missing
|
|
|
|
class memhistorypack(object):
|
|
def __init__(self):
|
|
self.history = {}
|
|
|
|
def add(self, name, node, p1, p2, linknode, copyfrom, linkrev=None):
|
|
if linkrev is not None:
|
|
raise error.ProgrammingError("memhistorypack doesn't support "
|
|
"linkrevs")
|
|
self.history.setdefault(name, {})[node] = (p1, p2, linknode, copyfrom)
|
|
|
|
def getmissing(self, keys):
|
|
missing = []
|
|
for name, node in keys:
|
|
filehistory = self.history.get(name)
|
|
if filehistory is None:
|
|
missing.append((name, node))
|
|
else:
|
|
if node not in filehistory:
|
|
missing.append((name, node))
|
|
return missing
|
|
|
|
def getancestors(self, name, node, known=None):
|
|
ancestors = {}
|
|
try:
|
|
ancestors[node] = self.history[name][node]
|
|
except KeyError:
|
|
raise KeyError((name, node))
|
|
return ancestors
|
|
|
|
def getnodeinfo(self, name, node):
|
|
try:
|
|
return self.history[name][node]
|
|
except KeyError:
|
|
raise KeyError((name, node))
|