treemanifest: rework lazy-copying code (issue4840)
The old lazy-copy code formed a chain of copied manifests with each
copy. Under typical operation, the stack never got more than a couple
of manifests deep and was fine. Under conditions like hgsubversion or
convert, the stack could get hundreds of manifests deep, and
eventually overflow the recursion limit for Python. I was able to
consistently reproduce this by converting an hgsubversion clone of
svn's history to treemanifests.
This may result in fewer manifests staying in memory during operations
like convert when treemanifests are in use, and should make those
operations faster since there will be significantly fewer noop
function calls going on.
A previous attempt (never mailed) of mine to fix this problem tried to
simply have all treemanifests only have a loadfunc - that caused
somewhat weird problems because the gettext() callable passed into
read() wasn't idempotent, so the easy solution is to have a loadfunc
and a copyfunc.
# manifest.py - manifest revision class 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 or any later version.
from i18n import _
import mdiff, parsers, error, revlog, util
import array, struct
import os
import heapq
propertycache = util.propertycache
def _parsev1(data):
# This method does a little bit of excessive-looking
# precondition checking. This is so that the behavior of this
# class exactly matches its C counterpart to try and help
# prevent surprise breakage for anyone that develops against
# the pure version.
if data and data[-1] != '\n':
raise ValueError('Manifest did not end in a newline.')
prev = None
for l in data.splitlines():
if prev is not None and prev > l:
raise ValueError('Manifest lines not in sorted order.')
prev = l
f, n = l.split('\0')
if len(n) > 40:
yield f, revlog.bin(n[:40]), n[40:]
else:
yield f, revlog.bin(n), ''
def _parsev2(data):
metadataend = data.find('\n')
# Just ignore metadata for now
pos = metadataend + 1
prevf = ''
while pos < len(data):
end = data.find('\n', pos + 1) # +1 to skip stem length byte
if end == -1:
raise ValueError('Manifest ended with incomplete file entry.')
stemlen = ord(data[pos])
items = data[pos + 1:end].split('\0')
f = prevf[:stemlen] + items[0]
if prevf > f:
raise ValueError('Manifest entries not in sorted order.')
fl = items[1]
# Just ignore metadata (items[2:] for now)
n = data[end + 1:end + 21]
yield f, n, fl
pos = end + 22
prevf = f
def _parse(data):
"""Generates (path, node, flags) tuples from a manifest text"""
if data.startswith('\0'):
return iter(_parsev2(data))
else:
return iter(_parsev1(data))
def _text(it, usemanifestv2):
"""Given an iterator over (path, node, flags) tuples, returns a manifest
text"""
if usemanifestv2:
return _textv2(it)
else:
return _textv1(it)
def _textv1(it):
files = []
lines = []
_hex = revlog.hex
for f, n, fl in it:
files.append(f)
# if this is changed to support newlines in filenames,
# be sure to check the templates/ dir again (especially *-raw.tmpl)
lines.append("%s\0%s%s\n" % (f, _hex(n), fl))
_checkforbidden(files)
return ''.join(lines)
def _textv2(it):
files = []
lines = ['\0\n']
prevf = ''
for f, n, fl in it:
files.append(f)
stem = os.path.commonprefix([prevf, f])
stemlen = min(len(stem), 255)
lines.append("%c%s\0%s\n%s\n" % (stemlen, f[stemlen:], fl, n))
prevf = f
_checkforbidden(files)
return ''.join(lines)
class _lazymanifest(dict):
"""This is the pure implementation of lazymanifest.
It has not been optimized *at all* and is not lazy.
"""
def __init__(self, data):
dict.__init__(self)
for f, n, fl in _parse(data):
self[f] = n, fl
def __setitem__(self, k, v):
node, flag = v
assert node is not None
if len(node) > 21:
node = node[:21] # match c implementation behavior
dict.__setitem__(self, k, (node, flag))
def __iter__(self):
return iter(sorted(dict.keys(self)))
def iterkeys(self):
return iter(sorted(dict.keys(self)))
def iterentries(self):
return ((f, e[0], e[1]) for f, e in sorted(self.iteritems()))
def copy(self):
c = _lazymanifest('')
c.update(self)
return c
def diff(self, m2, clean=False):
'''Finds changes between the current manifest and m2.'''
diff = {}
for fn, e1 in self.iteritems():
if fn not in m2:
diff[fn] = e1, (None, '')
else:
e2 = m2[fn]
if e1 != e2:
diff[fn] = e1, e2
elif clean:
diff[fn] = None
for fn, e2 in m2.iteritems():
if fn not in self:
diff[fn] = (None, ''), e2
return diff
def filtercopy(self, filterfn):
c = _lazymanifest('')
for f, n, fl in self.iterentries():
if filterfn(f):
c[f] = n, fl
return c
def text(self):
"""Get the full data of this manifest as a bytestring."""
return _textv1(self.iterentries())
try:
_lazymanifest = parsers.lazymanifest
except AttributeError:
pass
class manifestdict(object):
def __init__(self, data=''):
if data.startswith('\0'):
#_lazymanifest can not parse v2
self._lm = _lazymanifest('')
for f, n, fl in _parsev2(data):
self._lm[f] = n, fl
else:
self._lm = _lazymanifest(data)
def __getitem__(self, key):
return self._lm[key][0]
def find(self, key):
return self._lm[key]
def __len__(self):
return len(self._lm)
def __setitem__(self, key, node):
self._lm[key] = node, self.flags(key, '')
def __contains__(self, key):
return key in self._lm
def __delitem__(self, key):
del self._lm[key]
def __iter__(self):
return self._lm.__iter__()
def iterkeys(self):
return self._lm.iterkeys()
def keys(self):
return list(self.iterkeys())
def filesnotin(self, m2):
'''Set of files in this manifest that are not in the other'''
files = set(self)
files.difference_update(m2)
return files
@propertycache
def _dirs(self):
return util.dirs(self)
def dirs(self):
return self._dirs
def hasdir(self, dir):
return dir in self._dirs
def _filesfastpath(self, match):
'''Checks whether we can correctly and quickly iterate over matcher
files instead of over manifest files.'''
files = match.files()
return (len(files) < 100 and (match.isexact() or
(match.prefix() and all(fn in self for fn in files))))
def walk(self, match):
'''Generates matching file names.
Equivalent to manifest.matches(match).iterkeys(), but without creating
an entirely new manifest.
It also reports nonexistent files by marking them bad with match.bad().
'''
if match.always():
for f in iter(self):
yield f
return
fset = set(match.files())
# avoid the entire walk if we're only looking for specific files
if self._filesfastpath(match):
for fn in sorted(fset):
yield fn
return
for fn in self:
if fn in fset:
# specified pattern is the exact name
fset.remove(fn)
if match(fn):
yield fn
# for dirstate.walk, files=['.'] means "walk the whole tree".
# follow that here, too
fset.discard('.')
for fn in sorted(fset):
if not self.hasdir(fn):
match.bad(fn, None)
def matches(self, match):
'''generate a new manifest filtered by the match argument'''
if match.always():
return self.copy()
if self._filesfastpath(match):
m = manifestdict()
lm = self._lm
for fn in match.files():
if fn in lm:
m._lm[fn] = lm[fn]
return m
m = manifestdict()
m._lm = self._lm.filtercopy(match)
return m
def diff(self, m2, clean=False):
'''Finds changes between the current manifest and m2.
Args:
m2: the manifest to which this manifest should be compared.
clean: if true, include files unchanged between these manifests
with a None value in the returned dictionary.
The result is returned as a dict with filename as key and
values of the form ((n1,fl1),(n2,fl2)), where n1/n2 is the
nodeid in the current/other manifest and fl1/fl2 is the flag
in the current/other manifest. Where the file does not exist,
the nodeid will be None and the flags will be the empty
string.
'''
return self._lm.diff(m2._lm, clean)
def setflag(self, key, flag):
self._lm[key] = self[key], flag
def get(self, key, default=None):
try:
return self._lm[key][0]
except KeyError:
return default
def flags(self, key, default=''):
try:
return self._lm[key][1]
except KeyError:
return default
def copy(self):
c = manifestdict()
c._lm = self._lm.copy()
return c
def iteritems(self):
return (x[:2] for x in self._lm.iterentries())
def text(self, usemanifestv2=False):
if usemanifestv2:
return _textv2(self._lm.iterentries())
else:
# use (probably) native version for v1
return self._lm.text()
def fastdelta(self, base, changes):
"""Given a base manifest text as an array.array and a list of changes
relative to that text, compute a delta that can be used by revlog.
"""
delta = []
dstart = None
dend = None
dline = [""]
start = 0
# zero copy representation of base as a buffer
addbuf = util.buffer(base)
# start with a readonly loop that finds the offset of
# each line and creates the deltas
for f, todelete in changes:
# bs will either be the index of the item or the insert point
start, end = _msearch(addbuf, f, start)
if not todelete:
h, fl = self._lm[f]
l = "%s\0%s%s\n" % (f, revlog.hex(h), fl)
else:
if start == end:
# item we want to delete was not found, error out
raise AssertionError(
_("failed to remove %s from manifest") % f)
l = ""
if dstart is not None and dstart <= start and dend >= start:
if dend < end:
dend = end
if l:
dline.append(l)
else:
if dstart is not None:
delta.append([dstart, dend, "".join(dline)])
dstart = start
dend = end
dline = [l]
if dstart is not None:
delta.append([dstart, dend, "".join(dline)])
# apply the delta to the base, and get a delta for addrevision
deltatext, arraytext = _addlistdelta(base, delta)
return arraytext, deltatext
def _msearch(m, s, lo=0, hi=None):
'''return a tuple (start, end) that says where to find s within m.
If the string is found m[start:end] are the line containing
that string. If start == end the string was not found and
they indicate the proper sorted insertion point.
m should be a buffer or a string
s is a string'''
def advance(i, c):
while i < lenm and m[i] != c:
i += 1
return i
if not s:
return (lo, lo)
lenm = len(m)
if not hi:
hi = lenm
while lo < hi:
mid = (lo + hi) // 2
start = mid
while start > 0 and m[start - 1] != '\n':
start -= 1
end = advance(start, '\0')
if m[start:end] < s:
# we know that after the null there are 40 bytes of sha1
# this translates to the bisect lo = mid + 1
lo = advance(end + 40, '\n') + 1
else:
# this translates to the bisect hi = mid
hi = start
end = advance(lo, '\0')
found = m[lo:end]
if s == found:
# we know that after the null there are 40 bytes of sha1
end = advance(end + 40, '\n')
return (lo, end + 1)
else:
return (lo, lo)
def _checkforbidden(l):
"""Check filenames for illegal characters."""
for f in l:
if '\n' in f or '\r' in f:
raise error.RevlogError(
_("'\\n' and '\\r' disallowed in filenames: %r") % f)
# apply the changes collected during the bisect loop to our addlist
# return a delta suitable for addrevision
def _addlistdelta(addlist, x):
# for large addlist arrays, building a new array is cheaper
# than repeatedly modifying the existing one
currentposition = 0
newaddlist = array.array('c')
for start, end, content in x:
newaddlist += addlist[currentposition:start]
if content:
newaddlist += array.array('c', content)
currentposition = end
newaddlist += addlist[currentposition:]
deltatext = "".join(struct.pack(">lll", start, end, len(content))
+ content for start, end, content in x)
return deltatext, newaddlist
def _splittopdir(f):
if '/' in f:
dir, subpath = f.split('/', 1)
return dir + '/', subpath
else:
return '', f
_noop = lambda s: None
class treemanifest(object):
def __init__(self, dir='', text=''):
self._dir = dir
self._node = revlog.nullid
self._loadfunc = _noop
self._copyfunc = _noop
self._dirty = False
self._dirs = {}
# Using _lazymanifest here is a little slower than plain old dicts
self._files = {}
self._flags = {}
if text:
def readsubtree(subdir, subm):
raise AssertionError('treemanifest constructor only accepts '
'flat manifests')
self.parse(text, readsubtree)
self._dirty = True # Mark flat manifest dirty after parsing
def _subpath(self, path):
return self._dir + path
def __len__(self):
self._load()
size = len(self._files)
for m in self._dirs.values():
size += m.__len__()
return size
def _isempty(self):
self._load() # for consistency; already loaded by all callers
return (not self._files and (not self._dirs or
all(m._isempty() for m in self._dirs.values())))
def __repr__(self):
return ('<treemanifest dir=%s, node=%s, loaded=%s, dirty=%s at 0x%x>' %
(self._dir, revlog.hex(self._node),
bool(self._loadfunc is _noop),
self._dirty, id(self)))
def dir(self):
'''The directory that this tree manifest represents, including a
trailing '/'. Empty string for the repo root directory.'''
return self._dir
def node(self):
'''This node of this instance. nullid for unsaved instances. Should
be updated when the instance is read or written from a revlog.
'''
assert not self._dirty
return self._node
def setnode(self, node):
self._node = node
self._dirty = False
def iteritems(self):
self._load()
for p, n in sorted(self._dirs.items() + self._files.items()):
if p in self._files:
yield self._subpath(p), n
else:
for f, sn in n.iteritems():
yield f, sn
def iterkeys(self):
self._load()
for p in sorted(self._dirs.keys() + self._files.keys()):
if p in self._files:
yield self._subpath(p)
else:
for f in self._dirs[p].iterkeys():
yield f
def keys(self):
return list(self.iterkeys())
def __iter__(self):
return self.iterkeys()
def __contains__(self, f):
if f is None:
return False
self._load()
dir, subpath = _splittopdir(f)
if dir:
if dir not in self._dirs:
return False
return self._dirs[dir].__contains__(subpath)
else:
return f in self._files
def get(self, f, default=None):
self._load()
dir, subpath = _splittopdir(f)
if dir:
if dir not in self._dirs:
return default
return self._dirs[dir].get(subpath, default)
else:
return self._files.get(f, default)
def __getitem__(self, f):
self._load()
dir, subpath = _splittopdir(f)
if dir:
return self._dirs[dir].__getitem__(subpath)
else:
return self._files[f]
def flags(self, f):
self._load()
dir, subpath = _splittopdir(f)
if dir:
if dir not in self._dirs:
return ''
return self._dirs[dir].flags(subpath)
else:
if f in self._dirs:
return ''
return self._flags.get(f, '')
def find(self, f):
self._load()
dir, subpath = _splittopdir(f)
if dir:
return self._dirs[dir].find(subpath)
else:
return self._files[f], self._flags.get(f, '')
def __delitem__(self, f):
self._load()
dir, subpath = _splittopdir(f)
if dir:
self._dirs[dir].__delitem__(subpath)
# If the directory is now empty, remove it
if self._dirs[dir]._isempty():
del self._dirs[dir]
else:
del self._files[f]
if f in self._flags:
del self._flags[f]
self._dirty = True
def __setitem__(self, f, n):
assert n is not None
self._load()
dir, subpath = _splittopdir(f)
if dir:
if dir not in self._dirs:
self._dirs[dir] = treemanifest(self._subpath(dir))
self._dirs[dir].__setitem__(subpath, n)
else:
self._files[f] = n[:21] # to match manifestdict's behavior
self._dirty = True
def _load(self):
if self._loadfunc is not _noop:
lf, self._loadfunc = self._loadfunc, _noop
lf(self)
elif self._copyfunc is not _noop:
cf, self._copyfunc = self._copyfunc, _noop
cf(self)
def setflag(self, f, flags):
"""Set the flags (symlink, executable) for path f."""
assert 'd' not in flags
self._load()
dir, subpath = _splittopdir(f)
if dir:
if dir not in self._dirs:
self._dirs[dir] = treemanifest(self._subpath(dir))
self._dirs[dir].setflag(subpath, flags)
else:
self._flags[f] = flags
self._dirty = True
def copy(self):
copy = treemanifest(self._dir)
copy._node = self._node
copy._dirty = self._dirty
if self._copyfunc is _noop:
def _copyfunc(s):
self._load()
for d in self._dirs:
s._dirs[d] = self._dirs[d].copy()
s._files = dict.copy(self._files)
s._flags = dict.copy(self._flags)
if self._loadfunc is _noop:
_copyfunc(copy)
else:
copy._copyfunc = _copyfunc
else:
copy._copyfunc = self._copyfunc
return copy
def filesnotin(self, m2):
'''Set of files in this manifest that are not in the other'''
files = set()
def _filesnotin(t1, t2):
if t1._node == t2._node and not t1._dirty and not t2._dirty:
return
t1._load()
t2._load()
for d, m1 in t1._dirs.iteritems():
if d in t2._dirs:
m2 = t2._dirs[d]
_filesnotin(m1, m2)
else:
files.update(m1.iterkeys())
for fn in t1._files.iterkeys():
if fn not in t2._files:
files.add(t1._subpath(fn))
_filesnotin(self, m2)
return files
@propertycache
def _alldirs(self):
return util.dirs(self)
def dirs(self):
return self._alldirs
def hasdir(self, dir):
self._load()
topdir, subdir = _splittopdir(dir)
if topdir:
if topdir in self._dirs:
return self._dirs[topdir].hasdir(subdir)
return False
return (dir + '/') in self._dirs
def walk(self, match):
'''Generates matching file names.
Equivalent to manifest.matches(match).iterkeys(), but without creating
an entirely new manifest.
It also reports nonexistent files by marking them bad with match.bad().
'''
if match.always():
for f in iter(self):
yield f
return
fset = set(match.files())
for fn in self._walk(match):
if fn in fset:
# specified pattern is the exact name
fset.remove(fn)
yield fn
# for dirstate.walk, files=['.'] means "walk the whole tree".
# follow that here, too
fset.discard('.')
for fn in sorted(fset):
if not self.hasdir(fn):
match.bad(fn, None)
def _walk(self, match):
'''Recursively generates matching file names for walk().'''
if not match.visitdir(self._dir[:-1] or '.'):
return
# yield this dir's files and walk its submanifests
self._load()
for p in sorted(self._dirs.keys() + self._files.keys()):
if p in self._files:
fullp = self._subpath(p)
if match(fullp):
yield fullp
else:
for f in self._dirs[p]._walk(match):
yield f
def matches(self, match):
'''generate a new manifest filtered by the match argument'''
if match.always():
return self.copy()
return self._matches(match)
def _matches(self, match):
'''recursively generate a new manifest filtered by the match argument.
'''
ret = treemanifest(self._dir)
if not match.visitdir(self._dir[:-1] or '.'):
return ret
self._load()
for fn in self._files:
fullp = self._subpath(fn)
if not match(fullp):
continue
ret._files[fn] = self._files[fn]
if fn in self._flags:
ret._flags[fn] = self._flags[fn]
for dir, subm in self._dirs.iteritems():
m = subm._matches(match)
if not m._isempty():
ret._dirs[dir] = m
if not ret._isempty():
ret._dirty = True
return ret
def diff(self, m2, clean=False):
'''Finds changes between the current manifest and m2.
Args:
m2: the manifest to which this manifest should be compared.
clean: if true, include files unchanged between these manifests
with a None value in the returned dictionary.
The result is returned as a dict with filename as key and
values of the form ((n1,fl1),(n2,fl2)), where n1/n2 is the
nodeid in the current/other manifest and fl1/fl2 is the flag
in the current/other manifest. Where the file does not exist,
the nodeid will be None and the flags will be the empty
string.
'''
result = {}
emptytree = treemanifest()
def _diff(t1, t2):
if t1._node == t2._node and not t1._dirty and not t2._dirty:
return
t1._load()
t2._load()
for d, m1 in t1._dirs.iteritems():
m2 = t2._dirs.get(d, emptytree)
_diff(m1, m2)
for d, m2 in t2._dirs.iteritems():
if d not in t1._dirs:
_diff(emptytree, m2)
for fn, n1 in t1._files.iteritems():
fl1 = t1._flags.get(fn, '')
n2 = t2._files.get(fn, None)
fl2 = t2._flags.get(fn, '')
if n1 != n2 or fl1 != fl2:
result[t1._subpath(fn)] = ((n1, fl1), (n2, fl2))
elif clean:
result[t1._subpath(fn)] = None
for fn, n2 in t2._files.iteritems():
if fn not in t1._files:
fl2 = t2._flags.get(fn, '')
result[t2._subpath(fn)] = ((None, ''), (n2, fl2))
_diff(self, m2)
return result
def unmodifiedsince(self, m2):
return not self._dirty and not m2._dirty and self._node == m2._node
def parse(self, text, readsubtree):
for f, n, fl in _parse(text):
if fl == 'd':
f = f + '/'
self._dirs[f] = readsubtree(self._subpath(f), n)
elif '/' in f:
# This is a flat manifest, so use __setitem__ and setflag rather
# than assigning directly to _files and _flags, so we can
# assign a path in a subdirectory, and to mark dirty (compared
# to nullid).
self[f] = n
if fl:
self.setflag(f, fl)
else:
# Assigning to _files and _flags avoids marking as dirty,
# and should be a little faster.
self._files[f] = n
if fl:
self._flags[f] = fl
def text(self, usemanifestv2=False):
"""Get the full data of this manifest as a bytestring."""
self._load()
flags = self.flags
return _text(((f, self[f], flags(f)) for f in self.keys()),
usemanifestv2)
def dirtext(self, usemanifestv2=False):
"""Get the full data of this directory as a bytestring. Make sure that
any submanifests have been written first, so their nodeids are correct.
"""
self._load()
flags = self.flags
dirs = [(d[:-1], self._dirs[d]._node, 'd') for d in self._dirs]
files = [(f, self._files[f], flags(f)) for f in self._files]
return _text(sorted(dirs + files), usemanifestv2)
def read(self, gettext, readsubtree):
def _load_for_read(s):
s.parse(gettext(), readsubtree)
s._dirty = False
self._loadfunc = _load_for_read
def writesubtrees(self, m1, m2, writesubtree):
self._load() # for consistency; should never have any effect here
emptytree = treemanifest()
for d, subm in self._dirs.iteritems():
subp1 = m1._dirs.get(d, emptytree)._node
subp2 = m2._dirs.get(d, emptytree)._node
if subp1 == revlog.nullid:
subp1, subp2 = subp2, subp1
writesubtree(subm, subp1, subp2)
class manifest(revlog.revlog):
def __init__(self, opener, dir='', dirlogcache=None):
'''The 'dir' and 'dirlogcache' arguments are for internal use by
manifest.manifest only. External users should create a root manifest
log with manifest.manifest(opener) and call dirlog() on it.
'''
# During normal operations, we expect to deal with not more than four
# revs at a time (such as during commit --amend). When rebasing large
# stacks of commits, the number can go up, hence the config knob below.
cachesize = 4
usetreemanifest = False
usemanifestv2 = False
opts = getattr(opener, 'options', None)
if opts is not None:
cachesize = opts.get('manifestcachesize', cachesize)
usetreemanifest = opts.get('treemanifest', usetreemanifest)
usemanifestv2 = opts.get('manifestv2', usemanifestv2)
self._mancache = util.lrucachedict(cachesize)
self._treeinmem = usetreemanifest
self._treeondisk = usetreemanifest
self._usemanifestv2 = usemanifestv2
indexfile = "00manifest.i"
if dir:
assert self._treeondisk
if not dir.endswith('/'):
dir = dir + '/'
indexfile = "meta/" + dir + "00manifest.i"
revlog.revlog.__init__(self, opener, indexfile)
self._dir = dir
# The dirlogcache is kept on the root manifest log
if dir:
self._dirlogcache = dirlogcache
else:
self._dirlogcache = {'': self}
def _newmanifest(self, data=''):
if self._treeinmem:
return treemanifest(self._dir, data)
return manifestdict(data)
def dirlog(self, dir):
assert self._treeondisk
if dir not in self._dirlogcache:
self._dirlogcache[dir] = manifest(self.opener, dir,
self._dirlogcache)
return self._dirlogcache[dir]
def _slowreaddelta(self, node):
r0 = self.deltaparent(self.rev(node))
m0 = self.read(self.node(r0))
m1 = self.read(node)
md = self._newmanifest()
for f, ((n0, fl0), (n1, fl1)) in m0.diff(m1).iteritems():
if n1:
md[f] = n1
if fl1:
md.setflag(f, fl1)
return md
def readdelta(self, node):
if self._usemanifestv2 or self._treeondisk:
return self._slowreaddelta(node)
r = self.rev(node)
d = mdiff.patchtext(self.revdiff(self.deltaparent(r), r))
return self._newmanifest(d)
def readfast(self, node):
'''use the faster of readdelta or read
This will return a manifest which is either only the files
added/modified relative to p1, or all files in the
manifest. Which one is returned depends on the codepath used
to retrieve the data.
'''
r = self.rev(node)
deltaparent = self.deltaparent(r)
if deltaparent != revlog.nullrev and deltaparent in self.parentrevs(r):
return self.readdelta(node)
return self.read(node)
def read(self, node):
if node == revlog.nullid:
return self._newmanifest() # don't upset local cache
if node in self._mancache:
return self._mancache[node][0]
if self._treeondisk:
def gettext():
return self.revision(node)
def readsubtree(dir, subm):
return self.dirlog(dir).read(subm)
m = self._newmanifest()
m.read(gettext, readsubtree)
m.setnode(node)
arraytext = None
else:
text = self.revision(node)
m = self._newmanifest(text)
arraytext = array.array('c', text)
self._mancache[node] = (m, arraytext)
return m
def find(self, node, f):
'''look up entry for a single file efficiently.
return (node, flags) pair if found, (None, None) if not.'''
m = self.read(node)
try:
return m.find(f)
except KeyError:
return None, None
def add(self, m, transaction, link, p1, p2, added, removed):
if (p1 in self._mancache and not self._treeinmem
and not self._usemanifestv2):
# If our first parent is in the manifest cache, we can
# compute a delta here using properties we know about the
# manifest up-front, which may save time later for the
# revlog layer.
_checkforbidden(added)
# combine the changed lists into one sorted iterator
work = heapq.merge([(x, False) for x in added],
[(x, True) for x in removed])
arraytext, deltatext = m.fastdelta(self._mancache[p1][1], work)
cachedelta = self.rev(p1), deltatext
text = util.buffer(arraytext)
n = self.addrevision(text, transaction, link, p1, p2, cachedelta)
else:
# The first parent manifest isn't already loaded, so we'll
# just encode a fulltext of the manifest and pass that
# through to the revlog layer, and let it handle the delta
# process.
if self._treeondisk:
m1 = self.read(p1)
m2 = self.read(p2)
n = self._addtree(m, transaction, link, m1, m2)
arraytext = None
else:
text = m.text(self._usemanifestv2)
n = self.addrevision(text, transaction, link, p1, p2)
arraytext = array.array('c', text)
self._mancache[n] = (m, arraytext)
return n
def _addtree(self, m, transaction, link, m1, m2):
# If the manifest is unchanged compared to one parent,
# don't write a new revision
if m.unmodifiedsince(m1) or m.unmodifiedsince(m2):
return m.node()
def writesubtree(subm, subp1, subp2):
sublog = self.dirlog(subm.dir())
sublog.add(subm, transaction, link, subp1, subp2, None, None)
m.writesubtrees(m1, m2, writesubtree)
text = m.dirtext(self._usemanifestv2)
# Double-check whether contents are unchanged to one parent
if text == m1.dirtext(self._usemanifestv2):
n = m1.node()
elif text == m2.dirtext(self._usemanifestv2):
n = m2.node()
else:
n = self.addrevision(text, transaction, link, m1.node(), m2.node())
# Save nodeid so parent manifest can calculate its nodeid
m.setnode(n)
return n