Mercurial > hg
view mercurial/manifest.py @ 39506:b66ea3fc3a86
sparse-revlog: set max delta chain length to on thousand
The new snapshot system used in the sparse-revlog case gave us some small size
benefit so far. However its most important property is to gracefully handle
harder limit on delta chainlength.
Long delta chain has a very detrimental impact on read (and write) performance
in revlog. Being able to shorter them provide a great boost. However, shorting
delta used to result significantly lower compression ratio. The intermediate
snapshots effectively suppress most of this effect (even all in some case).
# Effect on the test repository
The repository we use for test is not "realistic" but can still show this in
action using an unreasonably low chain limit. Limiting the chain length show a
sizeable increase but stay under control: +6% for limit=15; +15% for limit=10.
Without the snapshot system the increase is significantly bigger: +45% for
limit=15; +80% for limit=10. Even slightly larger than without delta chain
limit, the resulting size is still smaller than before we started doing
snapshots.
Here is a table for comparison. *Since the repository is not branchy, the
initial sparse-revlog version does not bring much benefit compare to the
non-sparse one):
chain length limit | none | limit=15 | limit=10 |
without sparse-revlog | 62 818 987 | 112 664 615 | 131 222 574 |
without snapshot | 74 365 490 | 108 211 410 | 133 857 764 |
with snapshot | 59 230 936 | 63 002 924 | 68 415 329 |
# Effect On Real Life Repositories
The series provides significant benefits on all kind of repositories.
Using `hg debugupgraderepo -o redeltaparent --run`, we recomputed delta chain
for various repositories with different settings:
- delta chain length: unlimited or 1000 limit
- sparse-revlog: enabled or disabled
- this series: applied or not applied
We can observe multiple types of effect:
- On very branchy repositories:
* The delta chain limit as low impact on the repo size.
* Intermediate snapshot greatly reduces manifest size:
- pypy: -80%
- netbeans: -95%
* The delta chain limit is effective, without a size impact:
- netbeans average: 613 -> 282
- private #1 average: 1 068 -> 307
- On more linear repository:
* Intermediate snapshot limit the impact of delta chain limit:
- mozilla:
without the series: +360%
with the series: +25%
* The delta chain limit provides large improvement:
- mozilla's average chain length:
unlimited: 15 338
limited: 469
* Despite the chain length limit, the manifest size is reduced:
- mercurial: -25%
- mozilla: -30%
It is clear that the use of chains of intermediate snapshots provide large
benefits both in storage size and delta chains quality. We should now switch our
effort toward making sure the write performance are acceptable. Then,
`sparse-revlog` will be a suitable format for all new repository.
# Raw Statistic
* no-sparse: general delta repository not using sparse-revlog
* no-snapshot: sparse-revlog repository not using this series
* snapshot: sparse-revlog repository using this series
mercurial
Manifest Size:
limit | none | 1000
------------|-------------|------------
no-sparse | 8 021 373 | 8 199 366
no-snapshot | 8 103 561 | 8 259 719
snapshot | 6 137 116 | 6 126 433
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 307 | 1456 || 279 | 1000 ||
no-snapshot || 312 | 1456 || 283 | 1000 ||
snapshot || 248 | 1208 || 241 | 1000 ||
Full Store Size
limit | none | 1000
------------|-------------|------------
no-sparse | 51 013 198 | 51 201 574
no-snapshot | 50 930 795 | 51 141 006
snapshot | 48 072 037 | 48 093 572
pypy
Manifest Size:
limit | none | 1000
------------|-------------|------------
no-sparse | 193 987 784 | 193 987 784
no-snapshot | 163 171 745 | 163 312 229
snapshot | 34 605 900 | 34 600 750
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 101 | 692 || 101 | 692 ||
no-snapshot || 151 | 1307 || 148 | 1000 ||
snapshot || 128 | 1309 || 125 | 1000 ||
Full Store Size
limit | none | 1000
------------|-------------|------------
no-sparse | 495 931 473 | 495 931 473
no-snapshot | 465 441 017 | 465 581 501
snapshot | 355 467 301 | 355 472 451
Mozilla
Manifest Size:
limit | none | 1000
------------|----------------|---------------
no-sparse | 416 757 148 | 1 869 009 668
no-snapshot | 401 592 370 | 1 843 493 795
snapshot | 224 359 521 | 284 615 500
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 15 333 | 58 980 || 468 | 1 000 ||
no-snapshot || 15 336 | 58 980 || 469 | 1 000 ||
snapshot || 15 338 | 58 983 || 469 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 2 712 477 887 | 4 164 995 451
no-snapshot | 2 698 887 835 | 4 141 054 304
snapshot | 2 518 130 385 | 2 578 587 596
Netbeans
Manifest Size:
limit | none | 1000
------------|----------------|---------------
no-sparse | 4 766 794 101 | 4 870 642 687
no-snapshot | 4 334 806 082 | 4 428 681 309
snapshot | 232 659 666 | 240 330 665
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 597 | 6802 || 254 | 1 000 ||
no-snapshot || 648 | 6 802 || 305 | 1 000 ||
snapshot || 613 | 6 804 || 282 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 5 807 347 998 | 5 911 196 584
no-snapshot | 5 375 398 602 | 5 469 273 829
snapshot | 1 282 519 928 | 1 290 190 927
Private repo #1
Manifest Size:
limit | none | 1000
------------|-----------------|---------------
no-sparse | 41 389 010 840 | 41 398 162 091
no-snapshot | 9 737 319 435 | 10 223 773 150
snapshot | 744 215 807 | 747 961 822
Manifest Chain length data
limit || none || 1000 ||
value || average | max || average | max ||
------------||---------|---------||---------|---------||
no-sparse || 245 | 8 885 || 81 | 1 000 ||
no-snapshot || 1 225 | 8 885 || 336 | 1 000 ||
snapshot || 1 068 | 7 909 || 307 | 1 000 ||
Full Store Size
limit | none | 1000
------------|----------------|---------------
no-sparse | 49 646 065 126 | 49 655 216 377
no-snapshot | 17 924 862 856 | 18 411 316 571
snapshot | 9 009 024 710 | 9 012 770 725
Private repo #2
We currently have less data available for that repository.
* Before is a sparse-revlog repository without this series
* After is a sparse-revlog repository with this series + 1000 chain limit
Manifest Size:
Before: 1 531 485 040 bytes
After: 1 091 422 451 bytes
Manifest Chain:
Before: 2 218 avg; 6 575 Max
After: 442 avg; 1 000 Max
Full Store Size
Before: 15 203 955 615
after: 8 207 180 693
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Fri, 07 Sep 2018 11:18:45 -0400 |
parents | 5886384d1ac5 |
children | 93486cc46125 |
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# 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 __future__ import absolute_import import heapq import itertools import struct import weakref from .i18n import _ from .node import ( bin, hex, nullid, nullrev, ) from . import ( error, mdiff, policy, pycompat, repository, revlog, util, ) from .utils import ( interfaceutil, ) parsers = policy.importmod(r'parsers') propertycache = util.propertycache def _parse(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, bin(n[:40]), n[40:] else: yield f, bin(n), '' def _text(it): files = [] lines = [] 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) class lazymanifestiter(object): def __init__(self, lm): self.pos = 0 self.lm = lm def __iter__(self): return self def next(self): try: data, pos = self.lm._get(self.pos) except IndexError: raise StopIteration if pos == -1: self.pos += 1 return data[0] self.pos += 1 zeropos = data.find('\x00', pos) return data[pos:zeropos] __next__ = next class lazymanifestiterentries(object): def __init__(self, lm): self.lm = lm self.pos = 0 def __iter__(self): return self def next(self): try: data, pos = self.lm._get(self.pos) except IndexError: raise StopIteration if pos == -1: self.pos += 1 return data zeropos = data.find('\x00', pos) hashval = unhexlify(data, self.lm.extrainfo[self.pos], zeropos + 1, 40) flags = self.lm._getflags(data, self.pos, zeropos) self.pos += 1 return (data[pos:zeropos], hashval, flags) __next__ = next def unhexlify(data, extra, pos, length): s = bin(data[pos:pos + length]) if extra: s += chr(extra & 0xff) return s def _cmp(a, b): return (a > b) - (a < b) class _lazymanifest(object): def __init__(self, data, positions=None, extrainfo=None, extradata=None): if positions is None: self.positions = self.findlines(data) self.extrainfo = [0] * len(self.positions) self.data = data self.extradata = [] else: self.positions = positions[:] self.extrainfo = extrainfo[:] self.extradata = extradata[:] self.data = data def findlines(self, data): if not data: return [] pos = data.find("\n") if pos == -1 or data[-1:] != '\n': raise ValueError("Manifest did not end in a newline.") positions = [0] prev = data[:data.find('\x00')] while pos < len(data) - 1 and pos != -1: positions.append(pos + 1) nexts = data[pos + 1:data.find('\x00', pos + 1)] if nexts < prev: raise ValueError("Manifest lines not in sorted order.") prev = nexts pos = data.find("\n", pos + 1) return positions def _get(self, index): # get the position encoded in pos: # positive number is an index in 'data' # negative number is in extrapieces pos = self.positions[index] if pos >= 0: return self.data, pos return self.extradata[-pos - 1], -1 def _getkey(self, pos): if pos >= 0: return self.data[pos:self.data.find('\x00', pos + 1)] return self.extradata[-pos - 1][0] def bsearch(self, key): first = 0 last = len(self.positions) - 1 while first <= last: midpoint = (first + last)//2 nextpos = self.positions[midpoint] candidate = self._getkey(nextpos) r = _cmp(key, candidate) if r == 0: return midpoint else: if r < 0: last = midpoint - 1 else: first = midpoint + 1 return -1 def bsearch2(self, key): # same as the above, but will always return the position # done for performance reasons first = 0 last = len(self.positions) - 1 while first <= last: midpoint = (first + last)//2 nextpos = self.positions[midpoint] candidate = self._getkey(nextpos) r = _cmp(key, candidate) if r == 0: return (midpoint, True) else: if r < 0: last = midpoint - 1 else: first = midpoint + 1 return (first, False) def __contains__(self, key): return self.bsearch(key) != -1 def _getflags(self, data, needle, pos): start = pos + 41 end = data.find("\n", start) if end == -1: end = len(data) - 1 if start == end: return '' return self.data[start:end] def __getitem__(self, key): if not isinstance(key, bytes): raise TypeError("getitem: manifest keys must be a bytes.") needle = self.bsearch(key) if needle == -1: raise KeyError data, pos = self._get(needle) if pos == -1: return (data[1], data[2]) zeropos = data.find('\x00', pos) assert 0 <= needle <= len(self.positions) assert len(self.extrainfo) == len(self.positions) hashval = unhexlify(data, self.extrainfo[needle], zeropos + 1, 40) flags = self._getflags(data, needle, zeropos) return (hashval, flags) def __delitem__(self, key): needle, found = self.bsearch2(key) if not found: raise KeyError cur = self.positions[needle] self.positions = self.positions[:needle] + self.positions[needle + 1:] self.extrainfo = self.extrainfo[:needle] + self.extrainfo[needle + 1:] if cur >= 0: self.data = self.data[:cur] + '\x00' + self.data[cur + 1:] def __setitem__(self, key, value): if not isinstance(key, bytes): raise TypeError("setitem: manifest keys must be a byte string.") if not isinstance(value, tuple) or len(value) != 2: raise TypeError("Manifest values must be a tuple of (node, flags).") hashval = value[0] if not isinstance(hashval, bytes) or not 20 <= len(hashval) <= 22: raise TypeError("node must be a 20-byte byte string") flags = value[1] if len(hashval) == 22: hashval = hashval[:-1] if not isinstance(flags, bytes) or len(flags) > 1: raise TypeError("flags must a 0 or 1 byte string, got %r", flags) needle, found = self.bsearch2(key) if found: # put the item pos = self.positions[needle] if pos < 0: self.extradata[-pos - 1] = (key, hashval, value[1]) else: # just don't bother self.extradata.append((key, hashval, value[1])) self.positions[needle] = -len(self.extradata) else: # not found, put it in with extra positions self.extradata.append((key, hashval, value[1])) self.positions = (self.positions[:needle] + [-len(self.extradata)] + self.positions[needle:]) self.extrainfo = (self.extrainfo[:needle] + [0] + self.extrainfo[needle:]) def copy(self): # XXX call _compact like in C? return _lazymanifest(self.data, self.positions, self.extrainfo, self.extradata) def _compact(self): # hopefully not called TOO often if len(self.extradata) == 0: return l = [] last_cut = 0 i = 0 offset = 0 self.extrainfo = [0] * len(self.positions) while i < len(self.positions): if self.positions[i] >= 0: cur = self.positions[i] last_cut = cur while True: self.positions[i] = offset i += 1 if i == len(self.positions) or self.positions[i] < 0: break offset += self.positions[i] - cur cur = self.positions[i] end_cut = self.data.find('\n', cur) if end_cut != -1: end_cut += 1 offset += end_cut - cur l.append(self.data[last_cut:end_cut]) else: while i < len(self.positions) and self.positions[i] < 0: cur = self.positions[i] t = self.extradata[-cur - 1] l.append(self._pack(t)) self.positions[i] = offset if len(t[1]) > 20: self.extrainfo[i] = ord(t[1][21]) offset += len(l[-1]) i += 1 self.data = ''.join(l) self.extradata = [] def _pack(self, d): return d[0] + '\x00' + hex(d[1][:20]) + d[2] + '\n' def text(self): self._compact() return self.data def diff(self, m2, clean=False): '''Finds changes between the current manifest and m2.''' # XXX think whether efficiency matters here diff = {} for fn, e1, flags in self.iterentries(): if fn not in m2: diff[fn] = (e1, flags), (None, '') else: e2 = m2[fn] if (e1, flags) != e2: diff[fn] = (e1, flags), e2 elif clean: diff[fn] = None for fn, e2, flags in m2.iterentries(): if fn not in self: diff[fn] = (None, ''), (e2, flags) return diff def iterentries(self): return lazymanifestiterentries(self) def iterkeys(self): return lazymanifestiter(self) def __iter__(self): return lazymanifestiter(self) def __len__(self): return len(self.positions) def filtercopy(self, filterfn): # XXX should be optimized c = _lazymanifest('') for f, n, fl in self.iterentries(): if filterfn(f): c[f] = n, fl return c try: _lazymanifest = parsers.lazymanifest except AttributeError: pass @interfaceutil.implementer(repository.imanifestdict) class manifestdict(object): def __init__(self, data=''): 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 __nonzero__(self): # nonzero is covered by the __len__ function, but implementing it here # makes it easier for extensions to override. return len(self._lm) != 0 __bool__ = __nonzero__ def __setitem__(self, key, node): self._lm[key] = node, self.flags(key, '') def __contains__(self, key): if key is None: return False 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, match=None): '''Set of files in this manifest that are not in the other''' if match: m1 = self.matches(match) m2 = m2.matches(match) return m1.filesnotin(m2) diff = self.diff(m2) files = set(filepath for filepath, hashflags in diff.iteritems() if hashflags[1][0] is None) 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, match=None, 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. ''' if match: m1 = self.matches(match) m2 = m2.matches(match) return m1.diff(m2, clean=clean) 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 items(self): return (x[:2] for x in self._lm.iterentries()) def iteritems(self): return (x[:2] for x in self._lm.iterentries()) def iterentries(self): return self._lm.iterentries() def text(self): # most likely uses native version return self._lm.text() def fastdelta(self, base, changes): """Given a base manifest text as a bytearray 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) changes = list(changes) if len(changes) < 1000: # 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, 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) else: # For large changes, it's much cheaper to just build the text and # diff it. arraytext = bytearray(self.text()) deltatext = mdiff.textdiff( util.buffer(base), util.buffer(arraytext)) 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, a memoryview or a byte string. s is a byte string''' def advance(i, c): while i < lenm and m[i:i + 1] != 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:start] != '\n': start -= 1 end = advance(start, '\0') if bytes(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") % pycompat.bytestr(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 = bytearray() for start, end, content in x: newaddlist += addlist[currentposition:start] if content: newaddlist += bytearray(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 = 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 __nonzero__(self): # Faster than "__len() != 0" since it avoids loading sub-manifests return not self._isempty() __bool__ = __nonzero__ 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, 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 iterentries(self): self._load() for p, n in sorted(itertools.chain(self._dirs.items(), self._files.items())): if p in self._files: yield self._subpath(p), n, self._flags.get(p, '') else: for x in n.iterentries(): yield x def items(self): self._load() for p, n in sorted(itertools.chain(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 iteritems = items def iterkeys(self): self._load() for p in sorted(itertools.chain(self._dirs, self._files)): if p in self._files: yield self._subpath(p) else: for f in self._dirs[p]: 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.""" 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, match=None): '''Set of files in this manifest that are not in the other''' if match: m1 = self.matches(match) m2 = m2.matches(match) return m1.filesnotin(m2) 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: 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(list(self._dirs) + list(self._files)): 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. ''' visit = match.visitdir(self._dir[:-1] or '.') if visit == 'all': return self.copy() ret = treemanifest(self._dir) if not visit: 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, match=None, 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. ''' if match: m1 = self.matches(match) m2 = m2.matches(match) return m1.diff(m2, clean=clean) 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 == 't': 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): """Get the full data of this manifest as a bytestring.""" self._load() return _text(self.iterentries()) def dirtext(self): """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, 't') for d in self._dirs] files = [(f, self._files[f], flags(f)) for f in self._files] return _text(sorted(dirs + files)) 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 m1._load() m2._load() 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 == nullid: subp1, subp2 = subp2, subp1 writesubtree(subm, subp1, subp2) def walksubtrees(self, matcher=None): """Returns an iterator of the subtrees of this manifest, including this manifest itself. If `matcher` is provided, it only returns subtrees that match. """ if matcher and not matcher.visitdir(self._dir[:-1] or '.'): return if not matcher or matcher(self._dir[:-1]): yield self self._load() for d, subm in self._dirs.iteritems(): for subtree in subm.walksubtrees(matcher=matcher): yield subtree class manifestfulltextcache(util.lrucachedict): """File-backed LRU cache for the manifest cache File consists of entries, up to EOF: - 20 bytes node, 4 bytes length, <length> manifest data These are written in reverse cache order (oldest to newest). """ def __init__(self, max): super(manifestfulltextcache, self).__init__(max) self._dirty = False self._read = False self._opener = None def read(self): if self._read or self._opener is None: return try: with self._opener('manifestfulltextcache') as fp: set = super(manifestfulltextcache, self).__setitem__ # ignore trailing data, this is a cache, corruption is skipped while True: node = fp.read(20) if len(node) < 20: break try: size = struct.unpack('>L', fp.read(4))[0] except struct.error: break value = bytearray(fp.read(size)) if len(value) != size: break set(node, value) except IOError: # the file is allowed to be missing pass self._read = True self._dirty = False def write(self): if not self._dirty or self._opener is None: return # rotate backwards to the first used node with self._opener( 'manifestfulltextcache', 'w', atomictemp=True, checkambig=True ) as fp: node = self._head.prev while True: if node.key in self._cache: fp.write(node.key) fp.write(struct.pack('>L', len(node.value))) fp.write(node.value) if node is self._head: break node = node.prev def __len__(self): if not self._read: self.read() return super(manifestfulltextcache, self).__len__() def __contains__(self, k): if not self._read: self.read() return super(manifestfulltextcache, self).__contains__(k) def __iter__(self): if not self._read: self.read() return super(manifestfulltextcache, self).__iter__() def __getitem__(self, k): if not self._read: self.read() # the cache lru order can change on read setdirty = self._cache.get(k) is not self._head value = super(manifestfulltextcache, self).__getitem__(k) if setdirty: self._dirty = True return value def __setitem__(self, k, v): if not self._read: self.read() super(manifestfulltextcache, self).__setitem__(k, v) self._dirty = True def __delitem__(self, k): if not self._read: self.read() super(manifestfulltextcache, self).__delitem__(k) self._dirty = True def get(self, k, default=None): if not self._read: self.read() return super(manifestfulltextcache, self).get(k, default=default) def clear(self, clear_persisted_data=False): super(manifestfulltextcache, self).clear() if clear_persisted_data: self._dirty = True self.write() self._read = False @interfaceutil.implementer(repository.imanifeststorage) class manifestrevlog(object): '''A revlog that stores manifest texts. This is responsible for caching the full-text manifest contents. ''' def __init__(self, opener, tree='', dirlogcache=None, indexfile=None, treemanifest=False): """Constructs a new manifest revlog `indexfile` - used by extensions to have two manifests at once, like when transitioning between flatmanifeset and treemanifests. `treemanifest` - used to indicate this is a tree manifest revlog. Opener options can also be used to make this a tree manifest revlog. The opener option takes precedence, so if it is set to True, we ignore whatever value is passed in to the constructor. """ # 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 optiontreemanifest = False opts = getattr(opener, 'options', None) if opts is not None: cachesize = opts.get('manifestcachesize', cachesize) optiontreemanifest = opts.get('treemanifest', False) self._treeondisk = optiontreemanifest or treemanifest self._fulltextcache = manifestfulltextcache(cachesize) if tree: assert self._treeondisk, 'opts is %r' % opts if indexfile is None: indexfile = '00manifest.i' if tree: indexfile = "meta/" + tree + indexfile self.tree = tree # The dirlogcache is kept on the root manifest log if tree: self._dirlogcache = dirlogcache else: self._dirlogcache = {'': self} self._revlog = revlog.revlog(opener, indexfile, # only root indexfile is cached checkambig=not bool(tree), mmaplargeindex=True) self.index = self._revlog.index self.version = self._revlog.version self._generaldelta = self._revlog._generaldelta def _setupmanifestcachehooks(self, repo): """Persist the manifestfulltextcache on lock release""" if not util.safehasattr(repo, '_lockref'): return self._fulltextcache._opener = repo.cachevfs reporef = weakref.ref(repo) manifestrevlogref = weakref.ref(self) def persistmanifestcache(): repo = reporef() self = manifestrevlogref() if repo is None or self is None: return if repo.manifestlog.getstorage(b'') is not self: # there's a different manifest in play now, abort return self._fulltextcache.write() if repo._currentlock(repo._lockref) is not None: repo._afterlock(persistmanifestcache) @property def fulltextcache(self): return self._fulltextcache def clearcaches(self, clear_persisted_data=False): self._revlog.clearcaches() self._fulltextcache.clear(clear_persisted_data=clear_persisted_data) self._dirlogcache = {self.tree: self} def dirlog(self, d): if d: assert self._treeondisk if d not in self._dirlogcache: mfrevlog = manifestrevlog(self.opener, d, self._dirlogcache, treemanifest=self._treeondisk) self._dirlogcache[d] = mfrevlog return self._dirlogcache[d] def add(self, m, transaction, link, p1, p2, added, removed, readtree=None): if p1 in self.fulltextcache and util.safehasattr(m, 'fastdelta'): # 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.fulltextcache[p1], work) cachedelta = self._revlog.rev(p1), deltatext text = util.buffer(arraytext) n = self._revlog.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: assert readtree, "readtree must be set for treemanifest writes" m1 = readtree(self.tree, p1) m2 = readtree(self.tree, p2) n = self._addtree(m, transaction, link, m1, m2, readtree) arraytext = None else: text = m.text() n = self._revlog.addrevision(text, transaction, link, p1, p2) arraytext = bytearray(text) if arraytext is not None: self.fulltextcache[n] = arraytext return n def _addtree(self, m, transaction, link, m1, m2, readtree): # If the manifest is unchanged compared to one parent, # don't write a new revision if self.tree != '' and (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, readtree=readtree) m.writesubtrees(m1, m2, writesubtree) text = m.dirtext() n = None if self.tree != '': # Double-check whether contents are unchanged to one parent if text == m1.dirtext(): n = m1.node() elif text == m2.dirtext(): n = m2.node() if not n: n = self._revlog.addrevision(text, transaction, link, m1.node(), m2.node()) # Save nodeid so parent manifest can calculate its nodeid m.setnode(n) return n def __len__(self): return len(self._revlog) def __iter__(self): return self._revlog.__iter__() def rev(self, node): return self._revlog.rev(node) def node(self, rev): return self._revlog.node(rev) def lookup(self, value): return self._revlog.lookup(value) def parentrevs(self, rev): return self._revlog.parentrevs(rev) def parents(self, node): return self._revlog.parents(node) def linkrev(self, rev): return self._revlog.linkrev(rev) def checksize(self): return self._revlog.checksize() def revision(self, node, _df=None, raw=False): return self._revlog.revision(node, _df=_df, raw=raw) def revdiff(self, rev1, rev2): return self._revlog.revdiff(rev1, rev2) def cmp(self, node, text): return self._revlog.cmp(node, text) def deltaparent(self, rev): return self._revlog.deltaparent(rev) def emitrevisiondeltas(self, requests): return self._revlog.emitrevisiondeltas(requests) def addgroup(self, deltas, linkmapper, transaction, addrevisioncb=None): return self._revlog.addgroup(deltas, linkmapper, transaction, addrevisioncb=addrevisioncb) def getstrippoint(self, minlink): return self._revlog.getstrippoint(minlink) def strip(self, minlink, transaction): return self._revlog.strip(minlink, transaction) def files(self): return self._revlog.files() def clone(self, tr, destrevlog, **kwargs): if not isinstance(destrevlog, manifestrevlog): raise error.ProgrammingError('expected manifestrevlog to clone()') return self._revlog.clone(tr, destrevlog._revlog, **kwargs) @property def indexfile(self): return self._revlog.indexfile @indexfile.setter def indexfile(self, value): self._revlog.indexfile = value @property def opener(self): return self._revlog.opener @opener.setter def opener(self, value): self._revlog.opener = value @interfaceutil.implementer(repository.imanifestlog) class manifestlog(object): """A collection class representing the collection of manifest snapshots referenced by commits in the repository. In this situation, 'manifest' refers to the abstract concept of a snapshot of the list of files in the given commit. Consumers of the output of this class do not care about the implementation details of the actual manifests they receive (i.e. tree or flat or lazily loaded, etc).""" def __init__(self, opener, repo): usetreemanifest = False cachesize = 4 opts = getattr(opener, 'options', None) if opts is not None: usetreemanifest = opts.get('treemanifest', usetreemanifest) cachesize = opts.get('manifestcachesize', cachesize) self._treemanifests = usetreemanifest self._rootstore = repo._constructmanifest() self._rootstore._setupmanifestcachehooks(repo) self._narrowmatch = repo.narrowmatch() # A cache of the manifestctx or treemanifestctx for each directory self._dirmancache = {} self._dirmancache[''] = util.lrucachedict(cachesize) self._cachesize = cachesize def __getitem__(self, node): """Retrieves the manifest instance for the given node. Throws a LookupError if not found. """ return self.get('', node) def get(self, tree, node, verify=True): """Retrieves the manifest instance for the given node. Throws a LookupError if not found. `verify` - if True an exception will be thrown if the node is not in the revlog """ if node in self._dirmancache.get(tree, ()): return self._dirmancache[tree][node] if not self._narrowmatch.always(): if not self._narrowmatch.visitdir(tree[:-1] or '.'): return excludeddirmanifestctx(tree, node) if tree: if self._rootstore._treeondisk: if verify: # Side-effect is LookupError is raised if node doesn't # exist. self.getstorage(tree).rev(node) m = treemanifestctx(self, tree, node) else: raise error.Abort( _("cannot ask for manifest directory '%s' in a flat " "manifest") % tree) else: if verify: # Side-effect is LookupError is raised if node doesn't exist. self._rootstore.rev(node) if self._treemanifests: m = treemanifestctx(self, '', node) else: m = manifestctx(self, node) if node != nullid: mancache = self._dirmancache.get(tree) if not mancache: mancache = util.lrucachedict(self._cachesize) self._dirmancache[tree] = mancache mancache[node] = m return m def getstorage(self, tree): return self._rootstore.dirlog(tree) def clearcaches(self, clear_persisted_data=False): self._dirmancache.clear() self._rootstore.clearcaches(clear_persisted_data=clear_persisted_data) def rev(self, node): return self._rootstore.rev(node) @interfaceutil.implementer(repository.imanifestrevisionwritable) class memmanifestctx(object): def __init__(self, manifestlog): self._manifestlog = manifestlog self._manifestdict = manifestdict() def _storage(self): return self._manifestlog.getstorage(b'') def new(self): return memmanifestctx(self._manifestlog) def copy(self): memmf = memmanifestctx(self._manifestlog) memmf._manifestdict = self.read().copy() return memmf def read(self): return self._manifestdict def write(self, transaction, link, p1, p2, added, removed): return self._storage().add(self._manifestdict, transaction, link, p1, p2, added, removed) @interfaceutil.implementer(repository.imanifestrevisionstored) class manifestctx(object): """A class representing a single revision of a manifest, including its contents, its parent revs, and its linkrev. """ def __init__(self, manifestlog, node): self._manifestlog = manifestlog self._data = None self._node = node # TODO: We eventually want p1, p2, and linkrev exposed on this class, # but let's add it later when something needs it and we can load it # lazily. #self.p1, self.p2 = store.parents(node) #rev = store.rev(node) #self.linkrev = store.linkrev(rev) def _storage(self): return self._manifestlog.getstorage(b'') def node(self): return self._node def new(self): return memmanifestctx(self._manifestlog) def copy(self): memmf = memmanifestctx(self._manifestlog) memmf._manifestdict = self.read().copy() return memmf @propertycache def parents(self): return self._storage().parents(self._node) def read(self): if self._data is None: if self._node == nullid: self._data = manifestdict() else: store = self._storage() if self._node in store.fulltextcache: text = pycompat.bytestr(store.fulltextcache[self._node]) else: text = store.revision(self._node) arraytext = bytearray(text) store.fulltextcache[self._node] = arraytext self._data = manifestdict(text) return self._data def readfast(self, shallow=False): '''Calls either readdelta or read, based on which would be less work. readdelta is called if the delta is against the p1, and therefore can be read quickly. If `shallow` is True, nothing changes since this is a flat manifest. ''' store = self._storage() r = store.rev(self._node) deltaparent = store.deltaparent(r) if deltaparent != nullrev and deltaparent in store.parentrevs(r): return self.readdelta() return self.read() def readdelta(self, shallow=False): '''Returns a manifest containing just the entries that are present in this manifest, but not in its p1 manifest. This is efficient to read if the revlog delta is already p1. Changing the value of `shallow` has no effect on flat manifests. ''' store = self._storage() r = store.rev(self._node) d = mdiff.patchtext(store.revdiff(store.deltaparent(r), r)) return manifestdict(d) def find(self, key): return self.read().find(key) @interfaceutil.implementer(repository.imanifestrevisionwritable) class memtreemanifestctx(object): def __init__(self, manifestlog, dir=''): self._manifestlog = manifestlog self._dir = dir self._treemanifest = treemanifest() def _storage(self): return self._manifestlog.getstorage(b'') def new(self, dir=''): return memtreemanifestctx(self._manifestlog, dir=dir) def copy(self): memmf = memtreemanifestctx(self._manifestlog, dir=self._dir) memmf._treemanifest = self._treemanifest.copy() return memmf def read(self): return self._treemanifest def write(self, transaction, link, p1, p2, added, removed): def readtree(dir, node): return self._manifestlog.get(dir, node).read() return self._storage().add(self._treemanifest, transaction, link, p1, p2, added, removed, readtree=readtree) @interfaceutil.implementer(repository.imanifestrevisionstored) class treemanifestctx(object): def __init__(self, manifestlog, dir, node): self._manifestlog = manifestlog self._dir = dir self._data = None self._node = node # TODO: Load p1/p2/linkrev lazily. They need to be lazily loaded so that # we can instantiate treemanifestctx objects for directories we don't # have on disk. #self.p1, self.p2 = store.parents(node) #rev = store.rev(node) #self.linkrev = store.linkrev(rev) def _storage(self): narrowmatch = self._manifestlog._narrowmatch if not narrowmatch.always(): if not narrowmatch.visitdir(self._dir[:-1] or '.'): return excludedmanifestrevlog(self._dir) return self._manifestlog.getstorage(self._dir) def read(self): if self._data is None: store = self._storage() if self._node == nullid: self._data = treemanifest() # TODO accessing non-public API elif store._treeondisk: m = treemanifest(dir=self._dir) def gettext(): return store.revision(self._node) def readsubtree(dir, subm): # Set verify to False since we need to be able to create # subtrees for trees that don't exist on disk. return self._manifestlog.get(dir, subm, verify=False).read() m.read(gettext, readsubtree) m.setnode(self._node) self._data = m else: if self._node in store.fulltextcache: text = pycompat.bytestr(store.fulltextcache[self._node]) else: text = store.revision(self._node) arraytext = bytearray(text) store.fulltextcache[self._node] = arraytext self._data = treemanifest(dir=self._dir, text=text) return self._data def node(self): return self._node def new(self, dir=''): return memtreemanifestctx(self._manifestlog, dir=dir) def copy(self): memmf = memtreemanifestctx(self._manifestlog, dir=self._dir) memmf._treemanifest = self.read().copy() return memmf @propertycache def parents(self): return self._storage().parents(self._node) def readdelta(self, shallow=False): '''Returns a manifest containing just the entries that are present in this manifest, but not in its p1 manifest. This is efficient to read if the revlog delta is already p1. If `shallow` is True, this will read the delta for this directory, without recursively reading subdirectory manifests. Instead, any subdirectory entry will be reported as it appears in the manifest, i.e. the subdirectory will be reported among files and distinguished only by its 't' flag. ''' store = self._storage() if shallow: r = store.rev(self._node) d = mdiff.patchtext(store.revdiff(store.deltaparent(r), r)) return manifestdict(d) else: # Need to perform a slow delta r0 = store.deltaparent(store.rev(self._node)) m0 = self._manifestlog.get(self._dir, store.node(r0)).read() m1 = self.read() md = treemanifest(dir=self._dir) 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 readfast(self, shallow=False): '''Calls either readdelta or read, based on which would be less work. readdelta is called if the delta is against the p1, and therefore can be read quickly. If `shallow` is True, it only returns the entries from this manifest, and not any submanifests. ''' store = self._storage() r = store.rev(self._node) deltaparent = store.deltaparent(r) if (deltaparent != nullrev and deltaparent in store.parentrevs(r)): return self.readdelta(shallow=shallow) if shallow: return manifestdict(store.revision(self._node)) else: return self.read() def find(self, key): return self.read().find(key) class excludeddir(treemanifest): """Stand-in for a directory that is excluded from the repository. With narrowing active on a repository that uses treemanifests, some of the directory revlogs will be excluded from the resulting clone. This is a huge storage win for clients, but means we need some sort of pseudo-manifest to surface to internals so we can detect a merge conflict outside the narrowspec. That's what this class is: it stands in for a directory whose node is known, but whose contents are unknown. """ def __init__(self, dir, node): super(excludeddir, self).__init__(dir) self._node = node # Add an empty file, which will be included by iterators and such, # appearing as the directory itself (i.e. something like "dir/") self._files[''] = node self._flags[''] = 't' # Manifests outside the narrowspec should never be modified, so avoid # copying. This makes a noticeable difference when there are very many # directories outside the narrowspec. Also, it makes sense for the copy to # be of the same type as the original, which would not happen with the # super type's copy(). def copy(self): return self class excludeddirmanifestctx(treemanifestctx): """context wrapper for excludeddir - see that docstring for rationale""" def __init__(self, dir, node): self._dir = dir self._node = node def read(self): return excludeddir(self._dir, self._node) def write(self, *args): raise error.ProgrammingError( 'attempt to write manifest from excluded dir %s' % self._dir) class excludedmanifestrevlog(manifestrevlog): """Stand-in for excluded treemanifest revlogs. When narrowing is active on a treemanifest repository, we'll have references to directories we can't see due to the revlog being skipped. This class exists to conform to the manifestrevlog interface for those directories and proactively prevent writes to outside the narrowspec. """ def __init__(self, dir): self._dir = dir def __len__(self): raise error.ProgrammingError( 'attempt to get length of excluded dir %s' % self._dir) def rev(self, node): raise error.ProgrammingError( 'attempt to get rev from excluded dir %s' % self._dir) def linkrev(self, node): raise error.ProgrammingError( 'attempt to get linkrev from excluded dir %s' % self._dir) def node(self, rev): raise error.ProgrammingError( 'attempt to get node from excluded dir %s' % self._dir) def add(self, *args, **kwargs): # We should never write entries in dirlogs outside the narrow clone. # However, the method still gets called from writesubtree() in # _addtree(), so we need to handle it. We should possibly make that # avoid calling add() with a clean manifest (_dirty is always False # in excludeddir instances). pass