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# revlog.py - storage back-end for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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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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"""Storage back-end for Mercurial.
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This provides efficient delta storage with O(1) retrieve and append
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and O(changes) merge between branches.
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"""
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# import stuff from node for others to import from revlog
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from node import bin, hex, nullid, nullrev, short #@UnusedImport
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from i18n import _
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import ancestor, mdiff, parsers, error, util
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import struct, zlib, errno
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_pack = struct.pack
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_unpack = struct.unpack
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_compress = zlib.compress
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_decompress = zlib.decompress
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_sha = util.sha1
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# revlog header flags
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REVLOGV0 = 0
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REVLOGNG = 1
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REVLOGNGINLINEDATA = (1 << 16)
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REVLOGGENERALDELTA = (1 << 17)
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REVLOG_DEFAULT_FLAGS = REVLOGNGINLINEDATA
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REVLOG_DEFAULT_FORMAT = REVLOGNG
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REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
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REVLOGNG_FLAGS = REVLOGNGINLINEDATA | REVLOGGENERALDELTA
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# revlog index flags
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REVIDX_KNOWN_FLAGS = 0
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# max size of revlog with inline data
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_maxinline = 131072
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_chunksize = 1048576
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RevlogError = error.RevlogError
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LookupError = error.LookupError
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def getoffset(q):
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return int(q >> 16)
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def gettype(q):
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return int(q & 0xFFFF)
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def offset_type(offset, type):
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return long(long(offset) << 16 | type)
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nullhash = _sha(nullid)
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def hash(text, p1, p2):
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"""generate a hash from the given text and its parent hashes
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This hash combines both the current file contents and its history
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in a manner that makes it easy to distinguish nodes with the same
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content in the revision graph.
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"""
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# As of now, if one of the parent node is null, p2 is null
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if p2 == nullid:
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# deep copy of a hash is faster than creating one
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s = nullhash.copy()
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s.update(p1)
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else:
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# none of the parent nodes are nullid
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l = [p1, p2]
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l.sort()
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s = _sha(l[0])
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s.update(l[1])
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s.update(text)
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return s.digest()
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def compress(text):
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""" generate a possibly-compressed representation of text """
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if not text:
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return ("", text)
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l = len(text)
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bin = None
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if l < 44:
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pass
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elif l > 1000000:
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# zlib makes an internal copy, thus doubling memory usage for
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# large files, so lets do this in pieces
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z = zlib.compressobj()
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p = []
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pos = 0
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while pos < l:
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pos2 = pos + 2**20
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p.append(z.compress(text[pos:pos2]))
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pos = pos2
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p.append(z.flush())
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if sum(map(len, p)) < l:
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bin = "".join(p)
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else:
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bin = _compress(text)
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if bin is None or len(bin) > l:
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if text[0] == '\0':
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return ("", text)
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return ('u', text)
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return ("", bin)
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def decompress(bin):
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""" decompress the given input """
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if not bin:
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return bin
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t = bin[0]
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if t == '\0':
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return bin
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if t == 'x':
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return _decompress(bin)
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if t == 'u':
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return bin[1:]
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raise RevlogError(_("unknown compression type %r") % t)
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indexformatv0 = ">4l20s20s20s"
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v0shaoffset = 56
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class revlogoldio(object):
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def __init__(self):
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self.size = struct.calcsize(indexformatv0)
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def parseindex(self, data, inline):
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s = self.size
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index = []
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nodemap = {nullid: nullrev}
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n = off = 0
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l = len(data)
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while off + s <= l:
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cur = data[off:off + s]
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off += s
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e = _unpack(indexformatv0, cur)
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# transform to revlogv1 format
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e2 = (offset_type(e[0], 0), e[1], -1, e[2], e[3],
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nodemap.get(e[4], nullrev), nodemap.get(e[5], nullrev), e[6])
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index.append(e2)
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nodemap[e[6]] = n
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n += 1
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# add the magic null revision at -1
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index.append((0, 0, 0, -1, -1, -1, -1, nullid))
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return index, nodemap, None
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def packentry(self, entry, node, version, rev):
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if gettype(entry[0]):
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raise RevlogError(_("index entry flags need RevlogNG"))
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e2 = (getoffset(entry[0]), entry[1], entry[3], entry[4],
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node(entry[5]), node(entry[6]), entry[7])
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return _pack(indexformatv0, *e2)
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# index ng:
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# 6 bytes: offset
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# 2 bytes: flags
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# 4 bytes: compressed length
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# 4 bytes: uncompressed length
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# 4 bytes: base rev
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# 4 bytes: link rev
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# 4 bytes: parent 1 rev
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# 4 bytes: parent 2 rev
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# 32 bytes: nodeid
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indexformatng = ">Qiiiiii20s12x"
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ngshaoffset = 32
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versionformat = ">I"
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class revlogio(object):
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def __init__(self):
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self.size = struct.calcsize(indexformatng)
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def parseindex(self, data, inline):
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# call the C implementation to parse the index data
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index, cache = parsers.parse_index2(data, inline)
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return index, None, cache
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def packentry(self, entry, node, version, rev):
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p = _pack(indexformatng, *entry)
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if rev == 0:
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p = _pack(versionformat, version) + p[4:]
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return p
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class revlog(object):
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"""
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the underlying revision storage object
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A revlog consists of two parts, an index and the revision data.
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The index is a file with a fixed record size containing
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information on each revision, including its nodeid (hash), the
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nodeids of its parents, the position and offset of its data within
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the data file, and the revision it's based on. Finally, each entry
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contains a linkrev entry that can serve as a pointer to external
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data.
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The revision data itself is a linear collection of data chunks.
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Each chunk represents a revision and is usually represented as a
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delta against the previous chunk. To bound lookup time, runs of
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deltas are limited to about 2 times the length of the original
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version data. This makes retrieval of a version proportional to
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its size, or O(1) relative to the number of revisions.
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Both pieces of the revlog are written to in an append-only
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fashion, which means we never need to rewrite a file to insert or
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remove data, and can use some simple techniques to avoid the need
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for locking while reading.
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"""
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def __init__(self, opener, indexfile):
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"""
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create a revlog object
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opener is a function that abstracts the file opening operation
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and can be used to implement COW semantics or the like.
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"""
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self.indexfile = indexfile
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self.datafile = indexfile[:-2] + ".d"
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self.opener = opener
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self._cache = None
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self._basecache = (0, 0)
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self._chunkcache = (0, '')
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self.index = []
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self._pcache = {}
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self._nodecache = {nullid: nullrev}
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self._nodepos = None
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v = REVLOG_DEFAULT_VERSION
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if hasattr(opener, 'options'):
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if 'revlogv1' in opener.options:
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if 'generaldelta' in opener.options:
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v |= REVLOGGENERALDELTA
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else:
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v = 0
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i = ''
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self._initempty = True
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try:
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f = self.opener(self.indexfile)
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i = f.read()
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f.close()
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if len(i) > 0:
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v = struct.unpack(versionformat, i[:4])[0]
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self._initempty = False
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except IOError, inst:
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if inst.errno != errno.ENOENT:
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raise
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self.version = v
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self._inline = v & REVLOGNGINLINEDATA
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self._generaldelta = v & REVLOGGENERALDELTA
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flags = v & ~0xFFFF
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fmt = v & 0xFFFF
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if fmt == REVLOGV0 and flags:
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raise RevlogError(_("index %s unknown flags %#04x for format v0")
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% (self.indexfile, flags >> 16))
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elif fmt == REVLOGNG and flags & ~REVLOGNG_FLAGS:
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raise RevlogError(_("index %s unknown flags %#04x for revlogng")
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% (self.indexfile, flags >> 16))
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elif fmt > REVLOGNG:
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raise RevlogError(_("index %s unknown format %d")
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% (self.indexfile, fmt))
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self._io = revlogio()
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if self.version == REVLOGV0:
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self._io = revlogoldio()
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try:
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d = self._io.parseindex(i, self._inline)
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except (ValueError, IndexError):
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raise RevlogError(_("index %s is corrupted") % (self.indexfile))
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self.index, nodemap, self._chunkcache = d
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if nodemap is not None:
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self.nodemap = self._nodecache = nodemap
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if not self._chunkcache:
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self._chunkclear()
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def tip(self):
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return self.node(len(self.index) - 2)
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def __len__(self):
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return len(self.index) - 1
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def __iter__(self):
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for i in xrange(len(self)):
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yield i
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@util.propertycache
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def nodemap(self):
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self.rev(self.node(0))
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return self._nodecache
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def rev(self, node):
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try:
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return self._nodecache[node]
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except KeyError:
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n = self._nodecache
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i = self.index
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p = self._nodepos
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if p is None:
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p = len(i) - 2
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for r in xrange(p, -1, -1):
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v = i[r][7]
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n[v] = r
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if v == node:
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self._nodepos = r - 1
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return r
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raise LookupError(node, self.indexfile, _('no node'))
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def node(self, rev):
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return self.index[rev][7]
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def linkrev(self, rev):
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return self.index[rev][4]
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def parents(self, node):
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i = self.index
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d = i[self.rev(node)]
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return i[d[5]][7], i[d[6]][7] # map revisions to nodes inline
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def parentrevs(self, rev):
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return self.index[rev][5:7]
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def start(self, rev):
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return int(self.index[rev][0] >> 16)
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def end(self, rev):
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return self.start(rev) + self.length(rev)
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def length(self, rev):
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return self.index[rev][1]
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def base(self, rev):
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return self.index[rev][3]
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def chainbase(self, rev):
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index = self.index
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base = index[rev][3]
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while base != rev:
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rev = base
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base = index[rev][3]
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return base
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def flags(self, rev):
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return self.index[rev][0] & 0xFFFF
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def rawsize(self, rev):
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"""return the length of the uncompressed text for a given revision"""
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l = self.index[rev][2]
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if l >= 0:
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return l
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t = self.revision(self.node(rev))
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return len(t)
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size = rawsize
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def reachable(self, node, stop=None):
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"""return the set of all nodes ancestral to a given node, including
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the node itself, stopping when stop is matched"""
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reachable = set((node,))
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visit = [node]
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if stop:
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stopn = self.rev(stop)
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else:
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stopn = 0
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while visit:
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n = visit.pop(0)
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if n == stop:
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continue
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if n == nullid:
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continue
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for p in self.parents(n):
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if self.rev(p) < stopn:
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continue
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if p not in reachable:
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reachable.add(p)
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visit.append(p)
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return reachable
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def ancestors(self, *revs):
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"""Generate the ancestors of 'revs' in reverse topological order.
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Yield a sequence of revision numbers starting with the parents
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of each revision in revs, i.e., each revision is *not* considered
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an ancestor of itself. Results are in breadth-first order:
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parents of each rev in revs, then parents of those, etc. Result
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does not include the null revision."""
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visit = list(revs)
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seen = set([nullrev])
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while visit:
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for parent in self.parentrevs(visit.pop(0)):
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if parent not in seen:
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visit.append(parent)
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seen.add(parent)
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yield parent
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def descendants(self, *revs):
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"""Generate the descendants of 'revs' in revision order.
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Yield a sequence of revision numbers starting with a child of
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some rev in revs, i.e., each revision is *not* considered a
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descendant of itself. Results are ordered by revision number (a
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topological sort)."""
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first = min(revs)
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if first == nullrev:
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for i in self:
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yield i
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return
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seen = set(revs)
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for i in xrange(first + 1, len(self)):
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for x in self.parentrevs(i):
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if x != nullrev and x in seen:
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seen.add(i)
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yield i
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break
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def findcommonmissing(self, common=None, heads=None):
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"""Return a tuple of the ancestors of common and the ancestors of heads
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that are not ancestors of common.
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More specifically, the second element is a list of nodes N such that
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every N satisfies the following constraints:
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1. N is an ancestor of some node in 'heads'
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2. N is not an ancestor of any node in 'common'
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The list is sorted by revision number, meaning it is
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topologically sorted.
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'heads' and 'common' are both lists of node IDs. If heads is
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not supplied, uses all of the revlog's heads. If common is not
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supplied, uses nullid."""
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if common is None:
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common = [nullid]
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if heads is None:
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heads = self.heads()
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common = [self.rev(n) for n in common]
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heads = [self.rev(n) for n in heads]
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# we want the ancestors, but inclusive
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has = set(self.ancestors(*common))
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has.add(nullrev)
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has.update(common)
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# take all ancestors from heads that aren't in has
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missing = set()
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visit = [r for r in heads if r not in has]
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while visit:
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r = visit.pop(0)
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if r in missing:
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continue
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else:
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missing.add(r)
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for p in self.parentrevs(r):
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if p not in has:
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visit.append(p)
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missing = list(missing)
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missing.sort()
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|
return has, [self.node(r) for r in missing]
|
|
|
|
|
|
def findmissing(self, common=None, heads=None):
|
|
|
"""Return the ancestors of heads that are not ancestors of common.
|
|
|
|
|
|
More specifically, return a list of nodes N such that every N
|
|
|
satisfies the following constraints:
|
|
|
|
|
|
1. N is an ancestor of some node in 'heads'
|
|
|
2. N is not an ancestor of any node in 'common'
|
|
|
|
|
|
The list is sorted by revision number, meaning it is
|
|
|
topologically sorted.
|
|
|
|
|
|
'heads' and 'common' are both lists of node IDs. If heads is
|
|
|
not supplied, uses all of the revlog's heads. If common is not
|
|
|
supplied, uses nullid."""
|
|
|
_common, missing = self.findcommonmissing(common, heads)
|
|
|
return missing
|
|
|
|
|
|
def nodesbetween(self, roots=None, heads=None):
|
|
|
"""Return a topological path from 'roots' to 'heads'.
|
|
|
|
|
|
Return a tuple (nodes, outroots, outheads) where 'nodes' is a
|
|
|
topologically sorted list of all nodes N that satisfy both of
|
|
|
these constraints:
|
|
|
|
|
|
1. N is a descendant of some node in 'roots'
|
|
|
2. N is an ancestor of some node in 'heads'
|
|
|
|
|
|
Every node is considered to be both a descendant and an ancestor
|
|
|
of itself, so every reachable node in 'roots' and 'heads' will be
|
|
|
included in 'nodes'.
|
|
|
|
|
|
'outroots' is the list of reachable nodes in 'roots', i.e., the
|
|
|
subset of 'roots' that is returned in 'nodes'. Likewise,
|
|
|
'outheads' is the subset of 'heads' that is also in 'nodes'.
|
|
|
|
|
|
'roots' and 'heads' are both lists of node IDs. If 'roots' is
|
|
|
unspecified, uses nullid as the only root. If 'heads' is
|
|
|
unspecified, uses list of all of the revlog's heads."""
|
|
|
nonodes = ([], [], [])
|
|
|
if roots is not None:
|
|
|
roots = list(roots)
|
|
|
if not roots:
|
|
|
return nonodes
|
|
|
lowestrev = min([self.rev(n) for n in roots])
|
|
|
else:
|
|
|
roots = [nullid] # Everybody's a descendent of nullid
|
|
|
lowestrev = nullrev
|
|
|
if (lowestrev == nullrev) and (heads is None):
|
|
|
# We want _all_ the nodes!
|
|
|
return ([self.node(r) for r in self], [nullid], list(self.heads()))
|
|
|
if heads is None:
|
|
|
# All nodes are ancestors, so the latest ancestor is the last
|
|
|
# node.
|
|
|
highestrev = len(self) - 1
|
|
|
# Set ancestors to None to signal that every node is an ancestor.
|
|
|
ancestors = None
|
|
|
# Set heads to an empty dictionary for later discovery of heads
|
|
|
heads = {}
|
|
|
else:
|
|
|
heads = list(heads)
|
|
|
if not heads:
|
|
|
return nonodes
|
|
|
ancestors = set()
|
|
|
# Turn heads into a dictionary so we can remove 'fake' heads.
|
|
|
# Also, later we will be using it to filter out the heads we can't
|
|
|
# find from roots.
|
|
|
heads = dict.fromkeys(heads, False)
|
|
|
# Start at the top and keep marking parents until we're done.
|
|
|
nodestotag = set(heads)
|
|
|
# Remember where the top was so we can use it as a limit later.
|
|
|
highestrev = max([self.rev(n) for n in nodestotag])
|
|
|
while nodestotag:
|
|
|
# grab a node to tag
|
|
|
n = nodestotag.pop()
|
|
|
# Never tag nullid
|
|
|
if n == nullid:
|
|
|
continue
|
|
|
# A node's revision number represents its place in a
|
|
|
# topologically sorted list of nodes.
|
|
|
r = self.rev(n)
|
|
|
if r >= lowestrev:
|
|
|
if n not in ancestors:
|
|
|
# If we are possibly a descendent of one of the roots
|
|
|
# and we haven't already been marked as an ancestor
|
|
|
ancestors.add(n) # Mark as ancestor
|
|
|
# Add non-nullid parents to list of nodes to tag.
|
|
|
nodestotag.update([p for p in self.parents(n) if
|
|
|
p != nullid])
|
|
|
elif n in heads: # We've seen it before, is it a fake head?
|
|
|
# So it is, real heads should not be the ancestors of
|
|
|
# any other heads.
|
|
|
heads.pop(n)
|
|
|
if not ancestors:
|
|
|
return nonodes
|
|
|
# Now that we have our set of ancestors, we want to remove any
|
|
|
# roots that are not ancestors.
|
|
|
|
|
|
# If one of the roots was nullid, everything is included anyway.
|
|
|
if lowestrev > nullrev:
|
|
|
# But, since we weren't, let's recompute the lowest rev to not
|
|
|
# include roots that aren't ancestors.
|
|
|
|
|
|
# Filter out roots that aren't ancestors of heads
|
|
|
roots = [n for n in roots if n in ancestors]
|
|
|
# Recompute the lowest revision
|
|
|
if roots:
|
|
|
lowestrev = min([self.rev(n) for n in roots])
|
|
|
else:
|
|
|
# No more roots? Return empty list
|
|
|
return nonodes
|
|
|
else:
|
|
|
# We are descending from nullid, and don't need to care about
|
|
|
# any other roots.
|
|
|
lowestrev = nullrev
|
|
|
roots = [nullid]
|
|
|
# Transform our roots list into a set.
|
|
|
descendents = set(roots)
|
|
|
# Also, keep the original roots so we can filter out roots that aren't
|
|
|
# 'real' roots (i.e. are descended from other roots).
|
|
|
roots = descendents.copy()
|
|
|
# Our topologically sorted list of output nodes.
|
|
|
orderedout = []
|
|
|
# Don't start at nullid since we don't want nullid in our output list,
|
|
|
# and if nullid shows up in descedents, empty parents will look like
|
|
|
# they're descendents.
|
|
|
for r in xrange(max(lowestrev, 0), highestrev + 1):
|
|
|
n = self.node(r)
|
|
|
isdescendent = False
|
|
|
if lowestrev == nullrev: # Everybody is a descendent of nullid
|
|
|
isdescendent = True
|
|
|
elif n in descendents:
|
|
|
# n is already a descendent
|
|
|
isdescendent = True
|
|
|
# This check only needs to be done here because all the roots
|
|
|
# will start being marked is descendents before the loop.
|
|
|
if n in roots:
|
|
|
# If n was a root, check if it's a 'real' root.
|
|
|
p = tuple(self.parents(n))
|
|
|
# If any of its parents are descendents, it's not a root.
|
|
|
if (p[0] in descendents) or (p[1] in descendents):
|
|
|
roots.remove(n)
|
|
|
else:
|
|
|
p = tuple(self.parents(n))
|
|
|
# A node is a descendent if either of its parents are
|
|
|
# descendents. (We seeded the dependents list with the roots
|
|
|
# up there, remember?)
|
|
|
if (p[0] in descendents) or (p[1] in descendents):
|
|
|
descendents.add(n)
|
|
|
isdescendent = True
|
|
|
if isdescendent and ((ancestors is None) or (n in ancestors)):
|
|
|
# Only include nodes that are both descendents and ancestors.
|
|
|
orderedout.append(n)
|
|
|
if (ancestors is not None) and (n in heads):
|
|
|
# We're trying to figure out which heads are reachable
|
|
|
# from roots.
|
|
|
# Mark this head as having been reached
|
|
|
heads[n] = True
|
|
|
elif ancestors is None:
|
|
|
# Otherwise, we're trying to discover the heads.
|
|
|
# Assume this is a head because if it isn't, the next step
|
|
|
# will eventually remove it.
|
|
|
heads[n] = True
|
|
|
# But, obviously its parents aren't.
|
|
|
for p in self.parents(n):
|
|
|
heads.pop(p, None)
|
|
|
heads = [n for n, flag in heads.iteritems() if flag]
|
|
|
roots = list(roots)
|
|
|
assert orderedout
|
|
|
assert roots
|
|
|
assert heads
|
|
|
return (orderedout, roots, heads)
|
|
|
|
|
|
def headrevs(self):
|
|
|
count = len(self)
|
|
|
if not count:
|
|
|
return [nullrev]
|
|
|
ishead = [1] * (count + 1)
|
|
|
index = self.index
|
|
|
for r in xrange(count):
|
|
|
e = index[r]
|
|
|
ishead[e[5]] = ishead[e[6]] = 0
|
|
|
return [r for r in xrange(count) if ishead[r]]
|
|
|
|
|
|
def heads(self, start=None, stop=None):
|
|
|
"""return the list of all nodes that have no children
|
|
|
|
|
|
if start is specified, only heads that are descendants of
|
|
|
start will be returned
|
|
|
if stop is specified, it will consider all the revs from stop
|
|
|
as if they had no children
|
|
|
"""
|
|
|
if start is None and stop is None:
|
|
|
if not len(self):
|
|
|
return [nullid]
|
|
|
return [self.node(r) for r in self.headrevs()]
|
|
|
|
|
|
if start is None:
|
|
|
start = nullid
|
|
|
if stop is None:
|
|
|
stop = []
|
|
|
stoprevs = set([self.rev(n) for n in stop])
|
|
|
startrev = self.rev(start)
|
|
|
reachable = set((startrev,))
|
|
|
heads = set((startrev,))
|
|
|
|
|
|
parentrevs = self.parentrevs
|
|
|
for r in xrange(startrev + 1, len(self)):
|
|
|
for p in parentrevs(r):
|
|
|
if p in reachable:
|
|
|
if r not in stoprevs:
|
|
|
reachable.add(r)
|
|
|
heads.add(r)
|
|
|
if p in heads and p not in stoprevs:
|
|
|
heads.remove(p)
|
|
|
|
|
|
return [self.node(r) for r in heads]
|
|
|
|
|
|
def children(self, node):
|
|
|
"""find the children of a given node"""
|
|
|
c = []
|
|
|
p = self.rev(node)
|
|
|
for r in range(p + 1, len(self)):
|
|
|
prevs = [pr for pr in self.parentrevs(r) if pr != nullrev]
|
|
|
if prevs:
|
|
|
for pr in prevs:
|
|
|
if pr == p:
|
|
|
c.append(self.node(r))
|
|
|
elif p == nullrev:
|
|
|
c.append(self.node(r))
|
|
|
return c
|
|
|
|
|
|
def descendant(self, start, end):
|
|
|
if start == nullrev:
|
|
|
return True
|
|
|
for i in self.descendants(start):
|
|
|
if i == end:
|
|
|
return True
|
|
|
elif i > end:
|
|
|
break
|
|
|
return False
|
|
|
|
|
|
def ancestor(self, a, b):
|
|
|
"""calculate the least common ancestor of nodes a and b"""
|
|
|
|
|
|
# fast path, check if it is a descendant
|
|
|
a, b = self.rev(a), self.rev(b)
|
|
|
start, end = sorted((a, b))
|
|
|
if self.descendant(start, end):
|
|
|
return self.node(start)
|
|
|
|
|
|
def parents(rev):
|
|
|
return [p for p in self.parentrevs(rev) if p != nullrev]
|
|
|
|
|
|
c = ancestor.ancestor(a, b, parents)
|
|
|
if c is None:
|
|
|
return nullid
|
|
|
|
|
|
return self.node(c)
|
|
|
|
|
|
def _match(self, id):
|
|
|
if isinstance(id, (long, int)):
|
|
|
# rev
|
|
|
return self.node(id)
|
|
|
if len(id) == 20:
|
|
|
# possibly a binary node
|
|
|
# odds of a binary node being all hex in ASCII are 1 in 10**25
|
|
|
try:
|
|
|
node = id
|
|
|
self.rev(node) # quick search the index
|
|
|
return node
|
|
|
except LookupError:
|
|
|
pass # may be partial hex id
|
|
|
try:
|
|
|
# str(rev)
|
|
|
rev = int(id)
|
|
|
if str(rev) != id:
|
|
|
raise ValueError
|
|
|
if rev < 0:
|
|
|
rev = len(self) + rev
|
|
|
if rev < 0 or rev >= len(self):
|
|
|
raise ValueError
|
|
|
return self.node(rev)
|
|
|
except (ValueError, OverflowError):
|
|
|
pass
|
|
|
if len(id) == 40:
|
|
|
try:
|
|
|
# a full hex nodeid?
|
|
|
node = bin(id)
|
|
|
self.rev(node)
|
|
|
return node
|
|
|
except (TypeError, LookupError):
|
|
|
pass
|
|
|
|
|
|
def _partialmatch(self, id):
|
|
|
if id in self._pcache:
|
|
|
return self._pcache[id]
|
|
|
|
|
|
if len(id) < 40:
|
|
|
try:
|
|
|
# hex(node)[:...]
|
|
|
l = len(id) // 2 # grab an even number of digits
|
|
|
prefix = bin(id[:l * 2])
|
|
|
nl = [e[7] for e in self.index if e[7].startswith(prefix)]
|
|
|
nl = [n for n in nl if hex(n).startswith(id)]
|
|
|
if len(nl) > 0:
|
|
|
if len(nl) == 1:
|
|
|
self._pcache[id] = nl[0]
|
|
|
return nl[0]
|
|
|
raise LookupError(id, self.indexfile,
|
|
|
_('ambiguous identifier'))
|
|
|
return None
|
|
|
except TypeError:
|
|
|
pass
|
|
|
|
|
|
def lookup(self, id):
|
|
|
"""locate a node based on:
|
|
|
- revision number or str(revision number)
|
|
|
- nodeid or subset of hex nodeid
|
|
|
"""
|
|
|
n = self._match(id)
|
|
|
if n is not None:
|
|
|
return n
|
|
|
n = self._partialmatch(id)
|
|
|
if n:
|
|
|
return n
|
|
|
|
|
|
raise LookupError(id, self.indexfile, _('no match found'))
|
|
|
|
|
|
def cmp(self, node, text):
|
|
|
"""compare text with a given file revision
|
|
|
|
|
|
returns True if text is different than what is stored.
|
|
|
"""
|
|
|
p1, p2 = self.parents(node)
|
|
|
return hash(text, p1, p2) != node
|
|
|
|
|
|
def _addchunk(self, offset, data):
|
|
|
o, d = self._chunkcache
|
|
|
# try to add to existing cache
|
|
|
if o + len(d) == offset and len(d) + len(data) < _chunksize:
|
|
|
self._chunkcache = o, d + data
|
|
|
else:
|
|
|
self._chunkcache = offset, data
|
|
|
|
|
|
def _loadchunk(self, offset, length):
|
|
|
if self._inline:
|
|
|
df = self.opener(self.indexfile)
|
|
|
else:
|
|
|
df = self.opener(self.datafile)
|
|
|
|
|
|
readahead = max(65536, length)
|
|
|
df.seek(offset)
|
|
|
d = df.read(readahead)
|
|
|
self._addchunk(offset, d)
|
|
|
if readahead > length:
|
|
|
return d[:length]
|
|
|
return d
|
|
|
|
|
|
def _getchunk(self, offset, length):
|
|
|
o, d = self._chunkcache
|
|
|
l = len(d)
|
|
|
|
|
|
# is it in the cache?
|
|
|
cachestart = offset - o
|
|
|
cacheend = cachestart + length
|
|
|
if cachestart >= 0 and cacheend <= l:
|
|
|
if cachestart == 0 and cacheend == l:
|
|
|
return d # avoid a copy
|
|
|
return d[cachestart:cacheend]
|
|
|
|
|
|
return self._loadchunk(offset, length)
|
|
|
|
|
|
def _chunkraw(self, startrev, endrev):
|
|
|
start = self.start(startrev)
|
|
|
length = self.end(endrev) - start
|
|
|
if self._inline:
|
|
|
start += (startrev + 1) * self._io.size
|
|
|
return self._getchunk(start, length)
|
|
|
|
|
|
def _chunk(self, rev):
|
|
|
return decompress(self._chunkraw(rev, rev))
|
|
|
|
|
|
def _chunkbase(self, rev):
|
|
|
return self._chunk(rev)
|
|
|
|
|
|
def _chunkclear(self):
|
|
|
self._chunkcache = (0, '')
|
|
|
|
|
|
def deltaparent(self, rev):
|
|
|
"""return deltaparent of the given revision"""
|
|
|
base = self.index[rev][3]
|
|
|
if base == rev:
|
|
|
return nullrev
|
|
|
elif self._generaldelta:
|
|
|
return base
|
|
|
else:
|
|
|
return rev - 1
|
|
|
|
|
|
def revdiff(self, rev1, rev2):
|
|
|
"""return or calculate a delta between two revisions"""
|
|
|
if rev1 != nullrev and self.deltaparent(rev2) == rev1:
|
|
|
return self._chunk(rev2)
|
|
|
|
|
|
return mdiff.textdiff(self.revision(self.node(rev1)),
|
|
|
self.revision(self.node(rev2)))
|
|
|
|
|
|
def revision(self, node):
|
|
|
"""return an uncompressed revision of a given node"""
|
|
|
cachedrev = None
|
|
|
if node == nullid:
|
|
|
return ""
|
|
|
if self._cache:
|
|
|
if self._cache[0] == node:
|
|
|
return self._cache[2]
|
|
|
cachedrev = self._cache[1]
|
|
|
|
|
|
# look up what we need to read
|
|
|
text = None
|
|
|
rev = self.rev(node)
|
|
|
|
|
|
# check rev flags
|
|
|
if self.flags(rev) & ~REVIDX_KNOWN_FLAGS:
|
|
|
raise RevlogError(_('incompatible revision flag %x') %
|
|
|
(self.flags(rev) & ~REVIDX_KNOWN_FLAGS))
|
|
|
|
|
|
# build delta chain
|
|
|
chain = []
|
|
|
index = self.index # for performance
|
|
|
generaldelta = self._generaldelta
|
|
|
iterrev = rev
|
|
|
e = index[iterrev]
|
|
|
while iterrev != e[3] and iterrev != cachedrev:
|
|
|
chain.append(iterrev)
|
|
|
if generaldelta:
|
|
|
iterrev = e[3]
|
|
|
else:
|
|
|
iterrev -= 1
|
|
|
e = index[iterrev]
|
|
|
chain.reverse()
|
|
|
base = iterrev
|
|
|
|
|
|
if iterrev == cachedrev:
|
|
|
# cache hit
|
|
|
text = self._cache[2]
|
|
|
|
|
|
# drop cache to save memory
|
|
|
self._cache = None
|
|
|
|
|
|
self._chunkraw(base, rev)
|
|
|
if text is None:
|
|
|
text = self._chunkbase(base)
|
|
|
|
|
|
bins = [self._chunk(r) for r in chain]
|
|
|
text = mdiff.patches(text, bins)
|
|
|
|
|
|
text = self._checkhash(text, node, rev)
|
|
|
|
|
|
self._cache = (node, rev, text)
|
|
|
return text
|
|
|
|
|
|
def _checkhash(self, text, node, rev):
|
|
|
p1, p2 = self.parents(node)
|
|
|
if node != hash(text, p1, p2):
|
|
|
raise RevlogError(_("integrity check failed on %s:%d")
|
|
|
% (self.indexfile, rev))
|
|
|
return text
|
|
|
|
|
|
def checkinlinesize(self, tr, fp=None):
|
|
|
if not self._inline or (self.start(-2) + self.length(-2)) < _maxinline:
|
|
|
return
|
|
|
|
|
|
trinfo = tr.find(self.indexfile)
|
|
|
if trinfo is None:
|
|
|
raise RevlogError(_("%s not found in the transaction")
|
|
|
% self.indexfile)
|
|
|
|
|
|
trindex = trinfo[2]
|
|
|
dataoff = self.start(trindex)
|
|
|
|
|
|
tr.add(self.datafile, dataoff)
|
|
|
|
|
|
if fp:
|
|
|
fp.flush()
|
|
|
fp.close()
|
|
|
|
|
|
df = self.opener(self.datafile, 'w')
|
|
|
try:
|
|
|
for r in self:
|
|
|
df.write(self._chunkraw(r, r))
|
|
|
finally:
|
|
|
df.close()
|
|
|
|
|
|
fp = self.opener(self.indexfile, 'w', atomictemp=True)
|
|
|
self.version &= ~(REVLOGNGINLINEDATA)
|
|
|
self._inline = False
|
|
|
for i in self:
|
|
|
e = self._io.packentry(self.index[i], self.node, self.version, i)
|
|
|
fp.write(e)
|
|
|
|
|
|
# if we don't call rename, the temp file will never replace the
|
|
|
# real index
|
|
|
fp.rename()
|
|
|
|
|
|
tr.replace(self.indexfile, trindex * self._io.size)
|
|
|
self._chunkclear()
|
|
|
|
|
|
def addrevision(self, text, transaction, link, p1, p2, cachedelta=None):
|
|
|
"""add a revision to the log
|
|
|
|
|
|
text - the revision data to add
|
|
|
transaction - the transaction object used for rollback
|
|
|
link - the linkrev data to add
|
|
|
p1, p2 - the parent nodeids of the revision
|
|
|
cachedelta - an optional precomputed delta
|
|
|
"""
|
|
|
node = hash(text, p1, p2)
|
|
|
if node in self.nodemap:
|
|
|
return node
|
|
|
|
|
|
dfh = None
|
|
|
if not self._inline:
|
|
|
dfh = self.opener(self.datafile, "a")
|
|
|
ifh = self.opener(self.indexfile, "a+")
|
|
|
try:
|
|
|
return self._addrevision(node, text, transaction, link, p1, p2,
|
|
|
cachedelta, ifh, dfh)
|
|
|
finally:
|
|
|
if dfh:
|
|
|
dfh.close()
|
|
|
ifh.close()
|
|
|
|
|
|
def _addrevision(self, node, text, transaction, link, p1, p2,
|
|
|
cachedelta, ifh, dfh):
|
|
|
"""internal function to add revisions to the log
|
|
|
|
|
|
see addrevision for argument descriptions.
|
|
|
invariants:
|
|
|
- text is optional (can be None); if not set, cachedelta must be set.
|
|
|
if both are set, they must correspond to eachother.
|
|
|
"""
|
|
|
btext = [text]
|
|
|
def buildtext():
|
|
|
if btext[0] is not None:
|
|
|
return btext[0]
|
|
|
# flush any pending writes here so we can read it in revision
|
|
|
if dfh:
|
|
|
dfh.flush()
|
|
|
ifh.flush()
|
|
|
basetext = self.revision(self.node(cachedelta[0]))
|
|
|
btext[0] = mdiff.patch(basetext, cachedelta[1])
|
|
|
chk = hash(btext[0], p1, p2)
|
|
|
if chk != node:
|
|
|
raise RevlogError(_("consistency error in delta"))
|
|
|
return btext[0]
|
|
|
|
|
|
def builddelta(rev):
|
|
|
# can we use the cached delta?
|
|
|
if cachedelta and cachedelta[0] == rev:
|
|
|
delta = cachedelta[1]
|
|
|
else:
|
|
|
t = buildtext()
|
|
|
ptext = self.revision(self.node(rev))
|
|
|
delta = mdiff.textdiff(ptext, t)
|
|
|
data = compress(delta)
|
|
|
l = len(data[1]) + len(data[0])
|
|
|
if basecache[0] == rev:
|
|
|
chainbase = basecache[1]
|
|
|
else:
|
|
|
chainbase = self.chainbase(rev)
|
|
|
dist = l + offset - self.start(chainbase)
|
|
|
if self._generaldelta:
|
|
|
base = rev
|
|
|
else:
|
|
|
base = chainbase
|
|
|
return dist, l, data, base, chainbase
|
|
|
|
|
|
curr = len(self)
|
|
|
prev = curr - 1
|
|
|
base = chainbase = curr
|
|
|
offset = self.end(prev)
|
|
|
flags = 0
|
|
|
d = None
|
|
|
basecache = self._basecache
|
|
|
p1r, p2r = self.rev(p1), self.rev(p2)
|
|
|
|
|
|
# should we try to build a delta?
|
|
|
if prev != nullrev:
|
|
|
if self._generaldelta:
|
|
|
if p1r >= basecache[1]:
|
|
|
d = builddelta(p1r)
|
|
|
elif p2r >= basecache[1]:
|
|
|
d = builddelta(p2r)
|
|
|
else:
|
|
|
d = builddelta(prev)
|
|
|
else:
|
|
|
d = builddelta(prev)
|
|
|
dist, l, data, base, chainbase = d
|
|
|
|
|
|
# full versions are inserted when the needed deltas
|
|
|
# become comparable to the uncompressed text
|
|
|
if text is None:
|
|
|
textlen = mdiff.patchedsize(self.rawsize(cachedelta[0]),
|
|
|
cachedelta[1])
|
|
|
else:
|
|
|
textlen = len(text)
|
|
|
if d is None or dist > textlen * 2:
|
|
|
text = buildtext()
|
|
|
data = compress(text)
|
|
|
l = len(data[1]) + len(data[0])
|
|
|
base = chainbase = curr
|
|
|
|
|
|
e = (offset_type(offset, flags), l, textlen,
|
|
|
base, link, p1r, p2r, node)
|
|
|
self.index.insert(-1, e)
|
|
|
self.nodemap[node] = curr
|
|
|
|
|
|
entry = self._io.packentry(e, self.node, self.version, curr)
|
|
|
if not self._inline:
|
|
|
transaction.add(self.datafile, offset)
|
|
|
transaction.add(self.indexfile, curr * len(entry))
|
|
|
if data[0]:
|
|
|
dfh.write(data[0])
|
|
|
dfh.write(data[1])
|
|
|
dfh.flush()
|
|
|
ifh.write(entry)
|
|
|
else:
|
|
|
offset += curr * self._io.size
|
|
|
transaction.add(self.indexfile, offset, curr)
|
|
|
ifh.write(entry)
|
|
|
ifh.write(data[0])
|
|
|
ifh.write(data[1])
|
|
|
self.checkinlinesize(transaction, ifh)
|
|
|
|
|
|
if type(text) == str: # only accept immutable objects
|
|
|
self._cache = (node, curr, text)
|
|
|
self._basecache = (curr, chainbase)
|
|
|
return node
|
|
|
|
|
|
def group(self, nodelist, bundler):
|
|
|
"""Calculate a delta group, yielding a sequence of changegroup chunks
|
|
|
(strings).
|
|
|
|
|
|
Given a list of changeset revs, return a set of deltas and
|
|
|
metadata corresponding to nodes. The first delta is
|
|
|
first parent(nodelist[0]) -> nodelist[0], the receiver is
|
|
|
guaranteed to have this parent as it has all history before
|
|
|
these changesets. In the case firstparent is nullrev the
|
|
|
changegroup starts with a full revision.
|
|
|
"""
|
|
|
|
|
|
revs = sorted([self.rev(n) for n in nodelist])
|
|
|
|
|
|
# if we don't have any revisions touched by these changesets, bail
|
|
|
if not revs:
|
|
|
yield bundler.close()
|
|
|
return
|
|
|
|
|
|
# add the parent of the first rev
|
|
|
p = self.parentrevs(revs[0])[0]
|
|
|
revs.insert(0, p)
|
|
|
|
|
|
# build deltas
|
|
|
for r in xrange(len(revs) - 1):
|
|
|
prev, curr = revs[r], revs[r + 1]
|
|
|
for c in bundler.revchunk(self, curr, prev):
|
|
|
yield c
|
|
|
|
|
|
yield bundler.close()
|
|
|
|
|
|
def addgroup(self, bundle, linkmapper, transaction):
|
|
|
"""
|
|
|
add a delta group
|
|
|
|
|
|
given a set of deltas, add them to the revision log. the
|
|
|
first delta is against its parent, which should be in our
|
|
|
log, the rest are against the previous delta.
|
|
|
"""
|
|
|
|
|
|
# track the base of the current delta log
|
|
|
node = None
|
|
|
|
|
|
r = len(self)
|
|
|
end = 0
|
|
|
if r:
|
|
|
end = self.end(r - 1)
|
|
|
ifh = self.opener(self.indexfile, "a+")
|
|
|
isize = r * self._io.size
|
|
|
if self._inline:
|
|
|
transaction.add(self.indexfile, end + isize, r)
|
|
|
dfh = None
|
|
|
else:
|
|
|
transaction.add(self.indexfile, isize, r)
|
|
|
transaction.add(self.datafile, end)
|
|
|
dfh = self.opener(self.datafile, "a")
|
|
|
|
|
|
try:
|
|
|
# loop through our set of deltas
|
|
|
chain = None
|
|
|
while 1:
|
|
|
chunkdata = bundle.deltachunk(chain)
|
|
|
if not chunkdata:
|
|
|
break
|
|
|
node = chunkdata['node']
|
|
|
p1 = chunkdata['p1']
|
|
|
p2 = chunkdata['p2']
|
|
|
cs = chunkdata['cs']
|
|
|
deltabase = chunkdata['deltabase']
|
|
|
delta = chunkdata['delta']
|
|
|
|
|
|
link = linkmapper(cs)
|
|
|
if node in self.nodemap:
|
|
|
# this can happen if two branches make the same change
|
|
|
chain = node
|
|
|
continue
|
|
|
|
|
|
for p in (p1, p2):
|
|
|
if not p in self.nodemap:
|
|
|
raise LookupError(p, self.indexfile,
|
|
|
_('unknown parent'))
|
|
|
|
|
|
if deltabase not in self.nodemap:
|
|
|
raise LookupError(deltabase, self.indexfile,
|
|
|
_('unknown delta base'))
|
|
|
|
|
|
baserev = self.rev(deltabase)
|
|
|
chain = self._addrevision(node, None, transaction, link,
|
|
|
p1, p2, (baserev, delta), ifh, dfh)
|
|
|
if not dfh and not self._inline:
|
|
|
# addrevision switched from inline to conventional
|
|
|
# reopen the index
|
|
|
ifh.close()
|
|
|
dfh = self.opener(self.datafile, "a")
|
|
|
ifh = self.opener(self.indexfile, "a")
|
|
|
finally:
|
|
|
if dfh:
|
|
|
dfh.close()
|
|
|
ifh.close()
|
|
|
|
|
|
return node
|
|
|
|
|
|
def strip(self, minlink, transaction):
|
|
|
"""truncate the revlog on the first revision with a linkrev >= minlink
|
|
|
|
|
|
This function is called when we're stripping revision minlink and
|
|
|
its descendants from the repository.
|
|
|
|
|
|
We have to remove all revisions with linkrev >= minlink, because
|
|
|
the equivalent changelog revisions will be renumbered after the
|
|
|
strip.
|
|
|
|
|
|
So we truncate the revlog on the first of these revisions, and
|
|
|
trust that the caller has saved the revisions that shouldn't be
|
|
|
removed and that it'll readd them after this truncation.
|
|
|
"""
|
|
|
if len(self) == 0:
|
|
|
return
|
|
|
|
|
|
for rev in self:
|
|
|
if self.index[rev][4] >= minlink:
|
|
|
break
|
|
|
else:
|
|
|
return
|
|
|
|
|
|
# first truncate the files on disk
|
|
|
end = self.start(rev)
|
|
|
if not self._inline:
|
|
|
transaction.add(self.datafile, end)
|
|
|
end = rev * self._io.size
|
|
|
else:
|
|
|
end += rev * self._io.size
|
|
|
|
|
|
transaction.add(self.indexfile, end)
|
|
|
|
|
|
# then reset internal state in memory to forget those revisions
|
|
|
self._cache = None
|
|
|
self._chunkclear()
|
|
|
for x in xrange(rev, len(self)):
|
|
|
del self.nodemap[self.node(x)]
|
|
|
|
|
|
del self.index[rev:-1]
|
|
|
|
|
|
def checksize(self):
|
|
|
expected = 0
|
|
|
if len(self):
|
|
|
expected = max(0, self.end(len(self) - 1))
|
|
|
|
|
|
try:
|
|
|
f = self.opener(self.datafile)
|
|
|
f.seek(0, 2)
|
|
|
actual = f.tell()
|
|
|
f.close()
|
|
|
dd = actual - expected
|
|
|
except IOError, inst:
|
|
|
if inst.errno != errno.ENOENT:
|
|
|
raise
|
|
|
dd = 0
|
|
|
|
|
|
try:
|
|
|
f = self.opener(self.indexfile)
|
|
|
f.seek(0, 2)
|
|
|
actual = f.tell()
|
|
|
f.close()
|
|
|
s = self._io.size
|
|
|
i = max(0, actual // s)
|
|
|
di = actual - (i * s)
|
|
|
if self._inline:
|
|
|
databytes = 0
|
|
|
for r in self:
|
|
|
databytes += max(0, self.length(r))
|
|
|
dd = 0
|
|
|
di = actual - len(self) * s - databytes
|
|
|
except IOError, inst:
|
|
|
if inst.errno != errno.ENOENT:
|
|
|
raise
|
|
|
di = 0
|
|
|
|
|
|
return (dd, di)
|
|
|
|
|
|
def files(self):
|
|
|
res = [self.indexfile]
|
|
|
if not self._inline:
|
|
|
res.append(self.datafile)
|
|
|
return res
|
|
|
|
