1377 lines
47 KiB
Python
1377 lines
47 KiB
Python
# revlog.py - storage back-end for mercurial
|
|
#
|
|
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
|
|
#
|
|
# This software may be used and distributed according to the terms of the
|
|
# GNU General Public License version 2, incorporated herein by reference.
|
|
|
|
"""Storage back-end for Mercurial.
|
|
|
|
This provides efficient delta storage with O(1) retrieve and append
|
|
and O(changes) merge between branches.
|
|
"""
|
|
|
|
# import stuff from node for others to import from revlog
|
|
from node import bin, hex, nullid, nullrev, short #@UnusedImport
|
|
from i18n import _
|
|
import changegroup, ancestor, mdiff, parsers, error, util
|
|
import struct, zlib, errno
|
|
|
|
_pack = struct.pack
|
|
_unpack = struct.unpack
|
|
_compress = zlib.compress
|
|
_decompress = zlib.decompress
|
|
_sha = util.sha1
|
|
|
|
# revlog flags
|
|
REVLOGV0 = 0
|
|
REVLOGNG = 1
|
|
REVLOGNGINLINEDATA = (1 << 16)
|
|
REVLOG_DEFAULT_FLAGS = REVLOGNGINLINEDATA
|
|
REVLOG_DEFAULT_FORMAT = REVLOGNG
|
|
REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
|
|
|
|
_prereadsize = 1048576
|
|
|
|
RevlogError = error.RevlogError
|
|
LookupError = error.LookupError
|
|
|
|
def getoffset(q):
|
|
return int(q >> 16)
|
|
|
|
def gettype(q):
|
|
return int(q & 0xFFFF)
|
|
|
|
def offset_type(offset, type):
|
|
return long(long(offset) << 16 | type)
|
|
|
|
nullhash = _sha(nullid)
|
|
|
|
def hash(text, p1, p2):
|
|
"""generate a hash from the given text and its parent hashes
|
|
|
|
This hash combines both the current file contents and its history
|
|
in a manner that makes it easy to distinguish nodes with the same
|
|
content in the revision graph.
|
|
"""
|
|
# As of now, if one of the parent node is null, p2 is null
|
|
if p2 == nullid:
|
|
# deep copy of a hash is faster than creating one
|
|
s = nullhash.copy()
|
|
s.update(p1)
|
|
else:
|
|
# none of the parent nodes are nullid
|
|
l = [p1, p2]
|
|
l.sort()
|
|
s = _sha(l[0])
|
|
s.update(l[1])
|
|
s.update(text)
|
|
return s.digest()
|
|
|
|
def compress(text):
|
|
""" generate a possibly-compressed representation of text """
|
|
if not text:
|
|
return ("", text)
|
|
l = len(text)
|
|
bin = None
|
|
if l < 44:
|
|
pass
|
|
elif l > 1000000:
|
|
# zlib makes an internal copy, thus doubling memory usage for
|
|
# large files, so lets do this in pieces
|
|
z = zlib.compressobj()
|
|
p = []
|
|
pos = 0
|
|
while pos < l:
|
|
pos2 = pos + 2**20
|
|
p.append(z.compress(text[pos:pos2]))
|
|
pos = pos2
|
|
p.append(z.flush())
|
|
if sum(map(len, p)) < l:
|
|
bin = "".join(p)
|
|
else:
|
|
bin = _compress(text)
|
|
if bin is None or len(bin) > l:
|
|
if text[0] == '\0':
|
|
return ("", text)
|
|
return ('u', text)
|
|
return ("", bin)
|
|
|
|
def decompress(bin):
|
|
""" decompress the given input """
|
|
if not bin:
|
|
return bin
|
|
t = bin[0]
|
|
if t == '\0':
|
|
return bin
|
|
if t == 'x':
|
|
return _decompress(bin)
|
|
if t == 'u':
|
|
return bin[1:]
|
|
raise RevlogError(_("unknown compression type %r") % t)
|
|
|
|
class lazyparser(object):
|
|
"""
|
|
this class avoids the need to parse the entirety of large indices
|
|
"""
|
|
|
|
# lazyparser is not safe to use on windows if win32 extensions not
|
|
# available. it keeps file handle open, which make it not possible
|
|
# to break hardlinks on local cloned repos.
|
|
|
|
def __init__(self, dataf):
|
|
try:
|
|
size = util.fstat(dataf).st_size
|
|
except AttributeError:
|
|
size = 0
|
|
self.dataf = dataf
|
|
self.s = struct.calcsize(indexformatng)
|
|
self.datasize = size
|
|
self.l = size/self.s
|
|
self.index = [None] * self.l
|
|
self.map = {nullid: nullrev}
|
|
self.allmap = 0
|
|
self.all = 0
|
|
self.mapfind_count = 0
|
|
|
|
def loadmap(self):
|
|
"""
|
|
during a commit, we need to make sure the rev being added is
|
|
not a duplicate. This requires loading the entire index,
|
|
which is fairly slow. loadmap can load up just the node map,
|
|
which takes much less time.
|
|
"""
|
|
if self.allmap:
|
|
return
|
|
end = self.datasize
|
|
self.allmap = 1
|
|
cur = 0
|
|
count = 0
|
|
blocksize = self.s * 256
|
|
self.dataf.seek(0)
|
|
while cur < end:
|
|
data = self.dataf.read(blocksize)
|
|
off = 0
|
|
for x in xrange(256):
|
|
n = data[off + ngshaoffset:off + ngshaoffset + 20]
|
|
self.map[n] = count
|
|
count += 1
|
|
if count >= self.l:
|
|
break
|
|
off += self.s
|
|
cur += blocksize
|
|
|
|
def loadblock(self, blockstart, blocksize, data=None):
|
|
if self.all:
|
|
return
|
|
if data is None:
|
|
self.dataf.seek(blockstart)
|
|
if blockstart + blocksize > self.datasize:
|
|
# the revlog may have grown since we've started running,
|
|
# but we don't have space in self.index for more entries.
|
|
# limit blocksize so that we don't get too much data.
|
|
blocksize = max(self.datasize - blockstart, 0)
|
|
data = self.dataf.read(blocksize)
|
|
lend = len(data) / self.s
|
|
i = blockstart / self.s
|
|
off = 0
|
|
# lazyindex supports __delitem__
|
|
if lend > len(self.index) - i:
|
|
lend = len(self.index) - i
|
|
for x in xrange(lend):
|
|
if self.index[i + x] is None:
|
|
b = data[off : off + self.s]
|
|
self.index[i + x] = b
|
|
n = b[ngshaoffset:ngshaoffset + 20]
|
|
self.map[n] = i + x
|
|
off += self.s
|
|
|
|
def findnode(self, node):
|
|
"""search backwards through the index file for a specific node"""
|
|
if self.allmap:
|
|
return None
|
|
|
|
# hg log will cause many many searches for the manifest
|
|
# nodes. After we get called a few times, just load the whole
|
|
# thing.
|
|
if self.mapfind_count > 8:
|
|
self.loadmap()
|
|
if node in self.map:
|
|
return node
|
|
return None
|
|
self.mapfind_count += 1
|
|
last = self.l - 1
|
|
while self.index[last] != None:
|
|
if last == 0:
|
|
self.all = 1
|
|
self.allmap = 1
|
|
return None
|
|
last -= 1
|
|
end = (last + 1) * self.s
|
|
blocksize = self.s * 256
|
|
while end >= 0:
|
|
start = max(end - blocksize, 0)
|
|
self.dataf.seek(start)
|
|
data = self.dataf.read(end - start)
|
|
findend = end - start
|
|
while True:
|
|
# we're searching backwards, so we have to make sure
|
|
# we don't find a changeset where this node is a parent
|
|
off = data.find(node, 0, findend)
|
|
findend = off
|
|
if off >= 0:
|
|
i = off / self.s
|
|
off = i * self.s
|
|
n = data[off + ngshaoffset:off + ngshaoffset + 20]
|
|
if n == node:
|
|
self.map[n] = i + start / self.s
|
|
return node
|
|
else:
|
|
break
|
|
end -= blocksize
|
|
return None
|
|
|
|
def loadindex(self, i=None, end=None):
|
|
if self.all:
|
|
return
|
|
all = False
|
|
if i is None:
|
|
blockstart = 0
|
|
blocksize = (65536 / self.s) * self.s
|
|
end = self.datasize
|
|
all = True
|
|
else:
|
|
if end:
|
|
blockstart = i * self.s
|
|
end = end * self.s
|
|
blocksize = end - blockstart
|
|
else:
|
|
blockstart = (i & ~1023) * self.s
|
|
blocksize = self.s * 1024
|
|
end = blockstart + blocksize
|
|
while blockstart < end:
|
|
self.loadblock(blockstart, blocksize)
|
|
blockstart += blocksize
|
|
if all:
|
|
self.all = True
|
|
|
|
class lazyindex(object):
|
|
"""a lazy version of the index array"""
|
|
def __init__(self, parser):
|
|
self.p = parser
|
|
def __len__(self):
|
|
return len(self.p.index)
|
|
def load(self, pos):
|
|
if pos < 0:
|
|
pos += len(self.p.index)
|
|
self.p.loadindex(pos)
|
|
return self.p.index[pos]
|
|
def __getitem__(self, pos):
|
|
return _unpack(indexformatng, self.p.index[pos] or self.load(pos))
|
|
def __setitem__(self, pos, item):
|
|
self.p.index[pos] = _pack(indexformatng, *item)
|
|
def __delitem__(self, pos):
|
|
del self.p.index[pos]
|
|
def insert(self, pos, e):
|
|
self.p.index.insert(pos, _pack(indexformatng, *e))
|
|
def append(self, e):
|
|
self.p.index.append(_pack(indexformatng, *e))
|
|
|
|
class lazymap(object):
|
|
"""a lazy version of the node map"""
|
|
def __init__(self, parser):
|
|
self.p = parser
|
|
def load(self, key):
|
|
n = self.p.findnode(key)
|
|
if n is None:
|
|
raise KeyError(key)
|
|
def __contains__(self, key):
|
|
if key in self.p.map:
|
|
return True
|
|
self.p.loadmap()
|
|
return key in self.p.map
|
|
def __iter__(self):
|
|
yield nullid
|
|
for i in xrange(self.p.l):
|
|
ret = self.p.index[i]
|
|
if not ret:
|
|
self.p.loadindex(i)
|
|
ret = self.p.index[i]
|
|
if isinstance(ret, str):
|
|
ret = _unpack(indexformatng, ret)
|
|
yield ret[7]
|
|
def __getitem__(self, key):
|
|
try:
|
|
return self.p.map[key]
|
|
except KeyError:
|
|
try:
|
|
self.load(key)
|
|
return self.p.map[key]
|
|
except KeyError:
|
|
raise KeyError("node " + hex(key))
|
|
def __setitem__(self, key, val):
|
|
self.p.map[key] = val
|
|
def __delitem__(self, key):
|
|
del self.p.map[key]
|
|
|
|
indexformatv0 = ">4l20s20s20s"
|
|
v0shaoffset = 56
|
|
|
|
class revlogoldio(object):
|
|
def __init__(self):
|
|
self.size = struct.calcsize(indexformatv0)
|
|
|
|
def parseindex(self, fp, data, inline):
|
|
s = self.size
|
|
index = []
|
|
nodemap = {nullid: nullrev}
|
|
n = off = 0
|
|
if len(data) == _prereadsize:
|
|
data += fp.read() # read the rest
|
|
l = len(data)
|
|
while off + s <= l:
|
|
cur = data[off:off + s]
|
|
off += s
|
|
e = _unpack(indexformatv0, cur)
|
|
# transform to revlogv1 format
|
|
e2 = (offset_type(e[0], 0), e[1], -1, e[2], e[3],
|
|
nodemap.get(e[4], nullrev), nodemap.get(e[5], nullrev), e[6])
|
|
index.append(e2)
|
|
nodemap[e[6]] = n
|
|
n += 1
|
|
|
|
return index, nodemap, None
|
|
|
|
def packentry(self, entry, node, version, rev):
|
|
e2 = (getoffset(entry[0]), entry[1], entry[3], entry[4],
|
|
node(entry[5]), node(entry[6]), entry[7])
|
|
return _pack(indexformatv0, *e2)
|
|
|
|
# index ng:
|
|
# 6 bytes offset
|
|
# 2 bytes flags
|
|
# 4 bytes compressed length
|
|
# 4 bytes uncompressed length
|
|
# 4 bytes: base rev
|
|
# 4 bytes link rev
|
|
# 4 bytes parent 1 rev
|
|
# 4 bytes parent 2 rev
|
|
# 32 bytes: nodeid
|
|
indexformatng = ">Qiiiiii20s12x"
|
|
ngshaoffset = 32
|
|
versionformat = ">I"
|
|
|
|
class revlogio(object):
|
|
def __init__(self):
|
|
self.size = struct.calcsize(indexformatng)
|
|
|
|
def parseindex(self, fp, data, inline):
|
|
if len(data) == _prereadsize:
|
|
if util.openhardlinks() and not inline:
|
|
# big index, let's parse it on demand
|
|
parser = lazyparser(fp)
|
|
index = lazyindex(parser)
|
|
nodemap = lazymap(parser)
|
|
e = list(index[0])
|
|
type = gettype(e[0])
|
|
e[0] = offset_type(0, type)
|
|
index[0] = e
|
|
return index, nodemap, None
|
|
else:
|
|
data += fp.read()
|
|
|
|
# call the C implementation to parse the index data
|
|
index, nodemap, cache = parsers.parse_index(data, inline)
|
|
return index, nodemap, cache
|
|
|
|
def packentry(self, entry, node, version, rev):
|
|
p = _pack(indexformatng, *entry)
|
|
if rev == 0:
|
|
p = _pack(versionformat, version) + p[4:]
|
|
return p
|
|
|
|
class revlog(object):
|
|
"""
|
|
the underlying revision storage object
|
|
|
|
A revlog consists of two parts, an index and the revision data.
|
|
|
|
The index is a file with a fixed record size containing
|
|
information on each revision, including its nodeid (hash), the
|
|
nodeids of its parents, the position and offset of its data within
|
|
the data file, and the revision it's based on. Finally, each entry
|
|
contains a linkrev entry that can serve as a pointer to external
|
|
data.
|
|
|
|
The revision data itself is a linear collection of data chunks.
|
|
Each chunk represents a revision and is usually represented as a
|
|
delta against the previous chunk. To bound lookup time, runs of
|
|
deltas are limited to about 2 times the length of the original
|
|
version data. This makes retrieval of a version proportional to
|
|
its size, or O(1) relative to the number of revisions.
|
|
|
|
Both pieces of the revlog are written to in an append-only
|
|
fashion, which means we never need to rewrite a file to insert or
|
|
remove data, and can use some simple techniques to avoid the need
|
|
for locking while reading.
|
|
"""
|
|
def __init__(self, opener, indexfile):
|
|
"""
|
|
create a revlog object
|
|
|
|
opener is a function that abstracts the file opening operation
|
|
and can be used to implement COW semantics or the like.
|
|
"""
|
|
self.indexfile = indexfile
|
|
self.datafile = indexfile[:-2] + ".d"
|
|
self.opener = opener
|
|
self._cache = None
|
|
self._chunkcache = (0, '')
|
|
self.nodemap = {nullid: nullrev}
|
|
self.index = []
|
|
|
|
v = REVLOG_DEFAULT_VERSION
|
|
if hasattr(opener, "defversion"):
|
|
v = opener.defversion
|
|
if v & REVLOGNG:
|
|
v |= REVLOGNGINLINEDATA
|
|
|
|
i = ''
|
|
try:
|
|
f = self.opener(self.indexfile)
|
|
i = f.read(_prereadsize)
|
|
if len(i) > 0:
|
|
v = struct.unpack(versionformat, i[:4])[0]
|
|
except IOError, inst:
|
|
if inst.errno != errno.ENOENT:
|
|
raise
|
|
|
|
self.version = v
|
|
self._inline = v & REVLOGNGINLINEDATA
|
|
flags = v & ~0xFFFF
|
|
fmt = v & 0xFFFF
|
|
if fmt == REVLOGV0 and flags:
|
|
raise RevlogError(_("index %s unknown flags %#04x for format v0")
|
|
% (self.indexfile, flags >> 16))
|
|
elif fmt == REVLOGNG and flags & ~REVLOGNGINLINEDATA:
|
|
raise RevlogError(_("index %s unknown flags %#04x for revlogng")
|
|
% (self.indexfile, flags >> 16))
|
|
elif fmt > REVLOGNG:
|
|
raise RevlogError(_("index %s unknown format %d")
|
|
% (self.indexfile, fmt))
|
|
|
|
self._io = revlogio()
|
|
if self.version == REVLOGV0:
|
|
self._io = revlogoldio()
|
|
if i:
|
|
try:
|
|
d = self._io.parseindex(f, i, self._inline)
|
|
except (ValueError, IndexError), e:
|
|
raise RevlogError(_("index %s is corrupted") % (self.indexfile))
|
|
self.index, self.nodemap, self._chunkcache = d
|
|
if not self._chunkcache:
|
|
self._chunkclear()
|
|
|
|
# add the magic null revision at -1 (if it hasn't been done already)
|
|
if (self.index == [] or isinstance(self.index, lazyindex) or
|
|
self.index[-1][7] != nullid) :
|
|
self.index.append((0, 0, 0, -1, -1, -1, -1, nullid))
|
|
|
|
def _loadindex(self, start, end):
|
|
"""load a block of indexes all at once from the lazy parser"""
|
|
if isinstance(self.index, lazyindex):
|
|
self.index.p.loadindex(start, end)
|
|
|
|
def _loadindexmap(self):
|
|
"""loads both the map and the index from the lazy parser"""
|
|
if isinstance(self.index, lazyindex):
|
|
p = self.index.p
|
|
p.loadindex()
|
|
self.nodemap = p.map
|
|
|
|
def _loadmap(self):
|
|
"""loads the map from the lazy parser"""
|
|
if isinstance(self.nodemap, lazymap):
|
|
self.nodemap.p.loadmap()
|
|
self.nodemap = self.nodemap.p.map
|
|
|
|
def tip(self):
|
|
return self.node(len(self.index) - 2)
|
|
def __len__(self):
|
|
return len(self.index) - 1
|
|
def __iter__(self):
|
|
for i in xrange(len(self)):
|
|
yield i
|
|
def rev(self, node):
|
|
try:
|
|
return self.nodemap[node]
|
|
except KeyError:
|
|
raise LookupError(node, self.indexfile, _('no node'))
|
|
def node(self, rev):
|
|
return self.index[rev][7]
|
|
def linkrev(self, rev):
|
|
return self.index[rev][4]
|
|
def parents(self, node):
|
|
i = self.index
|
|
d = i[self.rev(node)]
|
|
return i[d[5]][7], i[d[6]][7] # map revisions to nodes inline
|
|
def parentrevs(self, rev):
|
|
return self.index[rev][5:7]
|
|
def start(self, rev):
|
|
return int(self.index[rev][0] >> 16)
|
|
def end(self, rev):
|
|
return self.start(rev) + self.length(rev)
|
|
def length(self, rev):
|
|
return self.index[rev][1]
|
|
def base(self, rev):
|
|
return self.index[rev][3]
|
|
|
|
def size(self, rev):
|
|
"""return the length of the uncompressed text for a given revision"""
|
|
l = self.index[rev][2]
|
|
if l >= 0:
|
|
return l
|
|
|
|
t = self.revision(self.node(rev))
|
|
return len(t)
|
|
|
|
# Alternate implementation. The advantage to this code is it
|
|
# will be faster for a single revision. However, the results
|
|
# are not cached, so finding the size of every revision will
|
|
# be slower.
|
|
#
|
|
# if self.cache and self.cache[1] == rev:
|
|
# return len(self.cache[2])
|
|
#
|
|
# base = self.base(rev)
|
|
# if self.cache and self.cache[1] >= base and self.cache[1] < rev:
|
|
# base = self.cache[1]
|
|
# text = self.cache[2]
|
|
# else:
|
|
# text = self.revision(self.node(base))
|
|
#
|
|
# l = len(text)
|
|
# for x in xrange(base + 1, rev + 1):
|
|
# l = mdiff.patchedsize(l, self._chunk(x))
|
|
# return l
|
|
|
|
def reachable(self, node, stop=None):
|
|
"""return the set of all nodes ancestral to a given node, including
|
|
the node itself, stopping when stop is matched"""
|
|
reachable = set((node,))
|
|
visit = [node]
|
|
if stop:
|
|
stopn = self.rev(stop)
|
|
else:
|
|
stopn = 0
|
|
while visit:
|
|
n = visit.pop(0)
|
|
if n == stop:
|
|
continue
|
|
if n == nullid:
|
|
continue
|
|
for p in self.parents(n):
|
|
if self.rev(p) < stopn:
|
|
continue
|
|
if p not in reachable:
|
|
reachable.add(p)
|
|
visit.append(p)
|
|
return reachable
|
|
|
|
def ancestors(self, *revs):
|
|
'Generate the ancestors of revs using a breadth-first visit'
|
|
visit = list(revs)
|
|
seen = set([nullrev])
|
|
while visit:
|
|
for parent in self.parentrevs(visit.pop(0)):
|
|
if parent not in seen:
|
|
visit.append(parent)
|
|
seen.add(parent)
|
|
yield parent
|
|
|
|
def descendants(self, *revs):
|
|
'Generate the descendants of revs in topological order'
|
|
seen = set(revs)
|
|
for i in xrange(min(revs) + 1, len(self)):
|
|
for x in self.parentrevs(i):
|
|
if x != nullrev and x in seen:
|
|
seen.add(i)
|
|
yield i
|
|
break
|
|
|
|
def findmissing(self, common=None, heads=None):
|
|
'''
|
|
returns the topologically sorted list of nodes from the set:
|
|
missing = (ancestors(heads) \ ancestors(common))
|
|
|
|
where ancestors() is the set of ancestors from heads, heads included
|
|
|
|
if heads is None, the heads of the revlog are used
|
|
if common is None, nullid is assumed to be a common node
|
|
'''
|
|
if common is None:
|
|
common = [nullid]
|
|
if heads is None:
|
|
heads = self.heads()
|
|
|
|
common = [self.rev(n) for n in common]
|
|
heads = [self.rev(n) for n in heads]
|
|
|
|
# we want the ancestors, but inclusive
|
|
has = set(self.ancestors(*common))
|
|
has.add(nullrev)
|
|
has.update(common)
|
|
|
|
# take all ancestors from heads that aren't in has
|
|
missing = set()
|
|
visit = [r for r in heads if r not in has]
|
|
while visit:
|
|
r = visit.pop(0)
|
|
if r in missing:
|
|
continue
|
|
else:
|
|
missing.add(r)
|
|
for p in self.parentrevs(r):
|
|
if p not in has:
|
|
visit.append(p)
|
|
missing = list(missing)
|
|
missing.sort()
|
|
return [self.node(r) for r in missing]
|
|
|
|
def nodesbetween(self, roots=None, heads=None):
|
|
"""Return a tuple containing three elements. Elements 1 and 2 contain
|
|
a final list bases and heads after all the unreachable ones have been
|
|
pruned. Element 0 contains a topologically sorted list of all
|
|
|
|
nodes that satisfy these constraints:
|
|
1. All nodes must be descended from a node in roots (the nodes on
|
|
roots are considered descended from themselves).
|
|
2. All nodes must also be ancestors of a node in heads (the nodes in
|
|
heads are considered to be their own ancestors).
|
|
|
|
If roots is unspecified, nullid is assumed as the only root.
|
|
If heads is unspecified, it is taken to be the output of the
|
|
heads method (i.e. a list of all nodes in the repository that
|
|
have no children)."""
|
|
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, 0)
|
|
# 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] = 1
|
|
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] = 1
|
|
# But, obviously its parents aren't.
|
|
for p in self.parents(n):
|
|
heads.pop(p, None)
|
|
heads = [n for n in heads.iterkeys() if heads[n] != 0]
|
|
roots = list(roots)
|
|
assert orderedout
|
|
assert roots
|
|
assert heads
|
|
return (orderedout, roots, heads)
|
|
|
|
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:
|
|
count = len(self)
|
|
if not count:
|
|
return [nullid]
|
|
ishead = [1] * (count + 1)
|
|
index = self.index
|
|
for r in xrange(count):
|
|
e = index[r]
|
|
ishead[e[5]] = ishead[e[6]] = 0
|
|
return [self.node(r) for r in xrange(count) if ishead[r]]
|
|
|
|
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 _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 len(id) < 40:
|
|
try:
|
|
# hex(node)[:...]
|
|
l = len(id) // 2 # grab an even number of digits
|
|
bin_id = bin(id[:l*2])
|
|
nl = [n for n in self.nodemap if n[:l] == bin_id]
|
|
nl = [n for n in nl if hex(n).startswith(id)]
|
|
if len(nl) > 0:
|
|
if len(nl) == 1:
|
|
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"""
|
|
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) < _prereadsize:
|
|
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 _chunkclear(self):
|
|
self._chunkcache = (0, '')
|
|
|
|
def revdiff(self, rev1, rev2):
|
|
"""return or calculate a delta between two revisions"""
|
|
if rev1 + 1 == rev2 and self.base(rev1) == self.base(rev2):
|
|
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"""
|
|
if node == nullid:
|
|
return ""
|
|
if self._cache and self._cache[0] == node:
|
|
return str(self._cache[2])
|
|
|
|
# look up what we need to read
|
|
text = None
|
|
rev = self.rev(node)
|
|
base = self.base(rev)
|
|
|
|
# check rev flags
|
|
if self.index[rev][0] & 0xFFFF:
|
|
raise RevlogError(_('incompatible revision flag %x') %
|
|
(self.index[rev][0] & 0xFFFF))
|
|
|
|
# do we have useful data cached?
|
|
if self._cache and self._cache[1] >= base and self._cache[1] < rev:
|
|
base = self._cache[1]
|
|
text = str(self._cache[2])
|
|
|
|
self._loadindex(base, rev + 1)
|
|
self._chunkraw(base, rev)
|
|
if text is None:
|
|
text = self._chunk(base)
|
|
|
|
bins = [self._chunk(r) for r in xrange(base + 1, rev + 1)]
|
|
text = mdiff.patches(text, bins)
|
|
p1, p2 = self.parents(node)
|
|
if node != hash(text, p1, p2):
|
|
raise RevlogError(_("integrity check failed on %s:%d")
|
|
% (self.indexfile, rev))
|
|
|
|
self._cache = (node, rev, text)
|
|
return text
|
|
|
|
def checkinlinesize(self, tr, fp=None):
|
|
if not self._inline or (self.start(-2) + self.length(-2)) < 131072:
|
|
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, d=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
|
|
d - an optional precomputed delta
|
|
"""
|
|
dfh = None
|
|
if not self._inline:
|
|
dfh = self.opener(self.datafile, "a")
|
|
ifh = self.opener(self.indexfile, "a+")
|
|
try:
|
|
return self._addrevision(text, transaction, link, p1, p2, d, ifh, dfh)
|
|
finally:
|
|
if dfh:
|
|
dfh.close()
|
|
ifh.close()
|
|
|
|
def _addrevision(self, text, transaction, link, p1, p2, d, ifh, dfh):
|
|
node = hash(text, p1, p2)
|
|
if node in self.nodemap:
|
|
return node
|
|
|
|
curr = len(self)
|
|
prev = curr - 1
|
|
base = self.base(prev)
|
|
offset = self.end(prev)
|
|
|
|
if curr:
|
|
if not d:
|
|
ptext = self.revision(self.node(prev))
|
|
d = mdiff.textdiff(ptext, text)
|
|
data = compress(d)
|
|
l = len(data[1]) + len(data[0])
|
|
dist = l + offset - self.start(base)
|
|
|
|
# full versions are inserted when the needed deltas
|
|
# become comparable to the uncompressed text
|
|
if not curr or dist > len(text) * 2:
|
|
data = compress(text)
|
|
l = len(data[1]) + len(data[0])
|
|
base = curr
|
|
|
|
e = (offset_type(offset, 0), l, len(text),
|
|
base, link, self.rev(p1), self.rev(p2), 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)
|
|
|
|
self._cache = (node, curr, text)
|
|
return node
|
|
|
|
def ancestor(self, a, b):
|
|
"""calculate the least common ancestor of nodes a and b"""
|
|
|
|
def parents(rev):
|
|
return [p for p in self.parentrevs(rev) if p != nullrev]
|
|
|
|
c = ancestor.ancestor(self.rev(a), self.rev(b), parents)
|
|
if c is None:
|
|
return nullid
|
|
|
|
return self.node(c)
|
|
|
|
def group(self, nodelist, lookup, infocollect=None):
|
|
"""calculate a delta group
|
|
|
|
Given a list of changeset revs, return a set of deltas and
|
|
metadata corresponding to nodes. the first delta is
|
|
parent(nodes[0]) -> nodes[0] the receiver is guaranteed to
|
|
have this parent as it has all history before these
|
|
changesets. parent is parent[0]
|
|
"""
|
|
|
|
revs = [self.rev(n) for n in nodelist]
|
|
|
|
# if we don't have any revisions touched by these changesets, bail
|
|
if not revs:
|
|
yield changegroup.closechunk()
|
|
return
|
|
|
|
# add the parent of the first rev
|
|
p = self.parentrevs(revs[0])[0]
|
|
revs.insert(0, p)
|
|
|
|
# build deltas
|
|
for d in xrange(len(revs) - 1):
|
|
a, b = revs[d], revs[d + 1]
|
|
nb = self.node(b)
|
|
|
|
if infocollect is not None:
|
|
infocollect(nb)
|
|
|
|
p = self.parents(nb)
|
|
meta = nb + p[0] + p[1] + lookup(nb)
|
|
if a == -1:
|
|
d = self.revision(nb)
|
|
meta += mdiff.trivialdiffheader(len(d))
|
|
else:
|
|
d = self.revdiff(a, b)
|
|
yield changegroup.chunkheader(len(meta) + len(d))
|
|
yield meta
|
|
if len(d) > 2**20:
|
|
pos = 0
|
|
while pos < len(d):
|
|
pos2 = pos + 2 ** 18
|
|
yield d[pos:pos2]
|
|
pos = pos2
|
|
else:
|
|
yield d
|
|
|
|
yield changegroup.closechunk()
|
|
|
|
def addgroup(self, revs, 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
|
|
r = len(self)
|
|
t = r - 1
|
|
node = None
|
|
|
|
base = prev = nullrev
|
|
start = end = textlen = 0
|
|
if r:
|
|
end = self.end(t)
|
|
|
|
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
|
|
for chunk in revs:
|
|
node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80])
|
|
link = linkmapper(cs)
|
|
if node in self.nodemap:
|
|
# this can happen if two branches make the same change
|
|
chain = node
|
|
continue
|
|
delta = buffer(chunk, 80)
|
|
del chunk
|
|
|
|
for p in (p1, p2):
|
|
if not p in self.nodemap:
|
|
raise LookupError(p, self.indexfile, _('unknown parent'))
|
|
|
|
if not chain:
|
|
# retrieve the parent revision of the delta chain
|
|
chain = p1
|
|
if not chain in self.nodemap:
|
|
raise LookupError(chain, self.indexfile, _('unknown base'))
|
|
|
|
# full versions are inserted when the needed deltas become
|
|
# comparable to the uncompressed text or when the previous
|
|
# version is not the one we have a delta against. We use
|
|
# the size of the previous full rev as a proxy for the
|
|
# current size.
|
|
|
|
if chain == prev:
|
|
cdelta = compress(delta)
|
|
cdeltalen = len(cdelta[0]) + len(cdelta[1])
|
|
textlen = mdiff.patchedsize(textlen, delta)
|
|
|
|
if chain != prev or (end - start + cdeltalen) > textlen * 2:
|
|
# flush our writes here so we can read it in revision
|
|
if dfh:
|
|
dfh.flush()
|
|
ifh.flush()
|
|
text = self.revision(chain)
|
|
if len(text) == 0:
|
|
# skip over trivial delta header
|
|
text = buffer(delta, 12)
|
|
else:
|
|
text = mdiff.patches(text, [delta])
|
|
del delta
|
|
chk = self._addrevision(text, transaction, link, p1, p2, None,
|
|
ifh, dfh)
|
|
if not dfh and not self._inline:
|
|
# addrevision switched from inline to conventional
|
|
# reopen the index
|
|
dfh = self.opener(self.datafile, "a")
|
|
ifh = self.opener(self.indexfile, "a")
|
|
if chk != node:
|
|
raise RevlogError(_("consistency error adding group"))
|
|
textlen = len(text)
|
|
else:
|
|
e = (offset_type(end, 0), cdeltalen, textlen, base,
|
|
link, self.rev(p1), self.rev(p2), node)
|
|
self.index.insert(-1, e)
|
|
self.nodemap[node] = r
|
|
entry = self._io.packentry(e, self.node, self.version, r)
|
|
if self._inline:
|
|
ifh.write(entry)
|
|
ifh.write(cdelta[0])
|
|
ifh.write(cdelta[1])
|
|
self.checkinlinesize(transaction, ifh)
|
|
if not self._inline:
|
|
dfh = self.opener(self.datafile, "a")
|
|
ifh = self.opener(self.indexfile, "a")
|
|
else:
|
|
dfh.write(cdelta[0])
|
|
dfh.write(cdelta[1])
|
|
ifh.write(entry)
|
|
|
|
t, r, chain, prev = r, r + 1, node, node
|
|
base = self.base(t)
|
|
start = self.start(base)
|
|
end = self.end(t)
|
|
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
|
|
|
|
if isinstance(self.index, lazyindex):
|
|
self._loadindexmap()
|
|
|
|
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()
|
|
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()
|
|
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
|