stream-clone: smoothly detect and handle a case were a revlog is split
This detect and handle the most common case for a race condition around stream
and revlog splitting. The one were the revlog is split between the initial
collection of data and the time were we start considering stream that data.
In such case, we repatch an inlined version of that revlog together when this
happens. This is necessary as stream-v2 promised a specific number of bytes and
a specific number of files to the client. In stream-v3, we will have the
opportunity to just send a split revlog instead.
Getting a better version of the protocol for stream-v3 is still useful, but it
is no longer a blocket to fix that race condition.
Note that another, rarer race condition exist, were the revlog is split while
we creating the revlog and extracing content from it. This can be dealt with
later.
# store.py - repository store handling for Mercurial
#
# Copyright 2008 Olivia Mackall <olivia@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.
import collections
import functools
import os
import re
import stat
from typing import Generator, List
from .i18n import _
from .pycompat import getattr
from .thirdparty import attr
from .node import hex
from . import (
changelog,
error,
filelog,
manifest,
policy,
pycompat,
util,
vfs as vfsmod,
)
from .utils import hashutil
parsers = policy.importmod('parsers')
# how much bytes should be read from fncache in one read
# It is done to prevent loading large fncache files into memory
fncache_chunksize = 10 ** 6
def _match_tracked_entry(entry, matcher):
"""parses a fncache entry and returns whether the entry is tracking a path
matched by matcher or not.
If matcher is None, returns True"""
if matcher is None:
return True
if entry.is_filelog:
return matcher(entry.target_id)
elif entry.is_manifestlog:
return matcher.visitdir(entry.target_id.rstrip(b'/'))
raise error.ProgrammingError(b"cannot process entry %r" % entry)
# This avoids a collision between a file named foo and a dir named
# foo.i or foo.d
def _encodedir(path):
"""
>>> _encodedir(b'data/foo.i')
'data/foo.i'
>>> _encodedir(b'data/foo.i/bla.i')
'data/foo.i.hg/bla.i'
>>> _encodedir(b'data/foo.i.hg/bla.i')
'data/foo.i.hg.hg/bla.i'
>>> _encodedir(b'data/foo.i\\ndata/foo.i/bla.i\\ndata/foo.i.hg/bla.i\\n')
'data/foo.i\\ndata/foo.i.hg/bla.i\\ndata/foo.i.hg.hg/bla.i\\n'
"""
return (
path.replace(b".hg/", b".hg.hg/")
.replace(b".i/", b".i.hg/")
.replace(b".d/", b".d.hg/")
)
encodedir = getattr(parsers, 'encodedir', _encodedir)
def decodedir(path):
"""
>>> decodedir(b'data/foo.i')
'data/foo.i'
>>> decodedir(b'data/foo.i.hg/bla.i')
'data/foo.i/bla.i'
>>> decodedir(b'data/foo.i.hg.hg/bla.i')
'data/foo.i.hg/bla.i'
"""
if b".hg/" not in path:
return path
return (
path.replace(b".d.hg/", b".d/")
.replace(b".i.hg/", b".i/")
.replace(b".hg.hg/", b".hg/")
)
def _reserved():
"""characters that are problematic for filesystems
* ascii escapes (0..31)
* ascii hi (126..255)
* windows specials
these characters will be escaped by encodefunctions
"""
winreserved = [ord(x) for x in u'\\:*?"<>|']
for x in range(32):
yield x
for x in range(126, 256):
yield x
for x in winreserved:
yield x
def _buildencodefun():
"""
>>> enc, dec = _buildencodefun()
>>> enc(b'nothing/special.txt')
'nothing/special.txt'
>>> dec(b'nothing/special.txt')
'nothing/special.txt'
>>> enc(b'HELLO')
'_h_e_l_l_o'
>>> dec(b'_h_e_l_l_o')
'HELLO'
>>> enc(b'hello:world?')
'hello~3aworld~3f'
>>> dec(b'hello~3aworld~3f')
'hello:world?'
>>> enc(b'the\\x07quick\\xADshot')
'the~07quick~adshot'
>>> dec(b'the~07quick~adshot')
'the\\x07quick\\xadshot'
"""
e = b'_'
xchr = pycompat.bytechr
asciistr = list(map(xchr, range(127)))
capitals = list(range(ord(b"A"), ord(b"Z") + 1))
cmap = {x: x for x in asciistr}
for x in _reserved():
cmap[xchr(x)] = b"~%02x" % x
for x in capitals + [ord(e)]:
cmap[xchr(x)] = e + xchr(x).lower()
dmap = {}
for k, v in cmap.items():
dmap[v] = k
def decode(s):
i = 0
while i < len(s):
for l in range(1, 4):
try:
yield dmap[s[i : i + l]]
i += l
break
except KeyError:
pass
else:
raise KeyError
return (
lambda s: b''.join([cmap[s[c : c + 1]] for c in range(len(s))]),
lambda s: b''.join(list(decode(s))),
)
_encodefname, _decodefname = _buildencodefun()
def encodefilename(s):
"""
>>> encodefilename(b'foo.i/bar.d/bla.hg/hi:world?/HELLO')
'foo.i.hg/bar.d.hg/bla.hg.hg/hi~3aworld~3f/_h_e_l_l_o'
"""
return _encodefname(encodedir(s))
def decodefilename(s):
"""
>>> decodefilename(b'foo.i.hg/bar.d.hg/bla.hg.hg/hi~3aworld~3f/_h_e_l_l_o')
'foo.i/bar.d/bla.hg/hi:world?/HELLO'
"""
return decodedir(_decodefname(s))
def _buildlowerencodefun():
"""
>>> f = _buildlowerencodefun()
>>> f(b'nothing/special.txt')
'nothing/special.txt'
>>> f(b'HELLO')
'hello'
>>> f(b'hello:world?')
'hello~3aworld~3f'
>>> f(b'the\\x07quick\\xADshot')
'the~07quick~adshot'
"""
xchr = pycompat.bytechr
cmap = {xchr(x): xchr(x) for x in range(127)}
for x in _reserved():
cmap[xchr(x)] = b"~%02x" % x
for x in range(ord(b"A"), ord(b"Z") + 1):
cmap[xchr(x)] = xchr(x).lower()
def lowerencode(s):
return b"".join([cmap[c] for c in pycompat.iterbytestr(s)])
return lowerencode
lowerencode = getattr(parsers, 'lowerencode', None) or _buildlowerencodefun()
# Windows reserved names: con, prn, aux, nul, com1..com9, lpt1..lpt9
_winres3 = (b'aux', b'con', b'prn', b'nul') # length 3
_winres4 = (b'com', b'lpt') # length 4 (with trailing 1..9)
def _auxencode(path, dotencode):
"""
Encodes filenames containing names reserved by Windows or which end in
period or space. Does not touch other single reserved characters c.
Specifically, c in '\\:*?"<>|' or ord(c) <= 31 are *not* encoded here.
Additionally encodes space or period at the beginning, if dotencode is
True. Parameter path is assumed to be all lowercase.
A segment only needs encoding if a reserved name appears as a
basename (e.g. "aux", "aux.foo"). A directory or file named "foo.aux"
doesn't need encoding.
>>> s = b'.foo/aux.txt/txt.aux/con/prn/nul/foo.'
>>> _auxencode(s.split(b'/'), True)
['~2efoo', 'au~78.txt', 'txt.aux', 'co~6e', 'pr~6e', 'nu~6c', 'foo~2e']
>>> s = b'.com1com2/lpt9.lpt4.lpt1/conprn/com0/lpt0/foo.'
>>> _auxencode(s.split(b'/'), False)
['.com1com2', 'lp~749.lpt4.lpt1', 'conprn', 'com0', 'lpt0', 'foo~2e']
>>> _auxencode([b'foo. '], True)
['foo.~20']
>>> _auxencode([b' .foo'], True)
['~20.foo']
"""
for i, n in enumerate(path):
if not n:
continue
if dotencode and n[0] in b'. ':
n = b"~%02x" % ord(n[0:1]) + n[1:]
path[i] = n
else:
l = n.find(b'.')
if l == -1:
l = len(n)
if (l == 3 and n[:3] in _winres3) or (
l == 4
and n[3:4] <= b'9'
and n[3:4] >= b'1'
and n[:3] in _winres4
):
# encode third letter ('aux' -> 'au~78')
ec = b"~%02x" % ord(n[2:3])
n = n[0:2] + ec + n[3:]
path[i] = n
if n[-1] in b'. ':
# encode last period or space ('foo...' -> 'foo..~2e')
path[i] = n[:-1] + b"~%02x" % ord(n[-1:])
return path
_maxstorepathlen = 120
_dirprefixlen = 8
_maxshortdirslen = 8 * (_dirprefixlen + 1) - 4
def _hashencode(path, dotencode):
digest = hex(hashutil.sha1(path).digest())
le = lowerencode(path[5:]).split(b'/') # skips prefix 'data/' or 'meta/'
parts = _auxencode(le, dotencode)
basename = parts[-1]
_root, ext = os.path.splitext(basename)
sdirs = []
sdirslen = 0
for p in parts[:-1]:
d = p[:_dirprefixlen]
if d[-1] in b'. ':
# Windows can't access dirs ending in period or space
d = d[:-1] + b'_'
if sdirslen == 0:
t = len(d)
else:
t = sdirslen + 1 + len(d)
if t > _maxshortdirslen:
break
sdirs.append(d)
sdirslen = t
dirs = b'/'.join(sdirs)
if len(dirs) > 0:
dirs += b'/'
res = b'dh/' + dirs + digest + ext
spaceleft = _maxstorepathlen - len(res)
if spaceleft > 0:
filler = basename[:spaceleft]
res = b'dh/' + dirs + filler + digest + ext
return res
def _hybridencode(path, dotencode):
"""encodes path with a length limit
Encodes all paths that begin with 'data/', according to the following.
Default encoding (reversible):
Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
characters are encoded as '~xx', where xx is the two digit hex code
of the character (see encodefilename).
Relevant path components consisting of Windows reserved filenames are
masked by encoding the third character ('aux' -> 'au~78', see _auxencode).
Hashed encoding (not reversible):
If the default-encoded path is longer than _maxstorepathlen, a
non-reversible hybrid hashing of the path is done instead.
This encoding uses up to _dirprefixlen characters of all directory
levels of the lowerencoded path, but not more levels than can fit into
_maxshortdirslen.
Then follows the filler followed by the sha digest of the full path.
The filler is the beginning of the basename of the lowerencoded path
(the basename is everything after the last path separator). The filler
is as long as possible, filling in characters from the basename until
the encoded path has _maxstorepathlen characters (or all chars of the
basename have been taken).
The extension (e.g. '.i' or '.d') is preserved.
The string 'data/' at the beginning is replaced with 'dh/', if the hashed
encoding was used.
"""
path = encodedir(path)
ef = _encodefname(path).split(b'/')
res = b'/'.join(_auxencode(ef, dotencode))
if len(res) > _maxstorepathlen:
res = _hashencode(path, dotencode)
return res
def _pathencode(path):
de = encodedir(path)
if len(path) > _maxstorepathlen:
return _hashencode(de, True)
ef = _encodefname(de).split(b'/')
res = b'/'.join(_auxencode(ef, True))
if len(res) > _maxstorepathlen:
return _hashencode(de, True)
return res
_pathencode = getattr(parsers, 'pathencode', _pathencode)
def _plainhybridencode(f):
return _hybridencode(f, False)
def _calcmode(vfs):
try:
# files in .hg/ will be created using this mode
mode = vfs.stat().st_mode
# avoid some useless chmods
if (0o777 & ~util.umask) == (0o777 & mode):
mode = None
except OSError:
mode = None
return mode
_data = [
b'bookmarks',
b'narrowspec',
b'data',
b'meta',
b'00manifest.d',
b'00manifest.i',
b'00changelog.d',
b'00changelog.i',
b'phaseroots',
b'obsstore',
b'requires',
]
REVLOG_FILES_MAIN_EXT = (b'.i',)
REVLOG_FILES_OTHER_EXT = (
b'.idx',
b'.d',
b'.dat',
b'.n',
b'.nd',
b'.sda',
)
# file extension that also use a `-SOMELONGIDHASH.ext` form
REVLOG_FILES_LONG_EXT = (
b'.nd',
b'.idx',
b'.dat',
b'.sda',
)
# files that are "volatile" and might change between listing and streaming
#
# note: the ".nd" file are nodemap data and won't "change" but they might be
# deleted.
REVLOG_FILES_VOLATILE_EXT = (b'.n', b'.nd')
# some exception to the above matching
#
# XXX This is currently not in use because of issue6542
EXCLUDED = re.compile(br'.*undo\.[^/]+\.(nd?|i)$')
def is_revlog(f, kind, st):
if kind != stat.S_IFREG:
return None
return revlog_type(f)
def revlog_type(f):
# XXX we need to filter `undo.` created by the transaction here, however
# being naive about it also filter revlog for `undo.*` files, leading to
# issue6542. So we no longer use EXCLUDED.
if f.endswith(REVLOG_FILES_MAIN_EXT):
return FILEFLAGS_REVLOG_MAIN
elif f.endswith(REVLOG_FILES_OTHER_EXT):
t = FILETYPE_FILELOG_OTHER
if f.endswith(REVLOG_FILES_VOLATILE_EXT):
t |= FILEFLAGS_VOLATILE
return t
return None
# the file is part of changelog data
FILEFLAGS_CHANGELOG = 1 << 13
# the file is part of manifest data
FILEFLAGS_MANIFESTLOG = 1 << 12
# the file is part of filelog data
FILEFLAGS_FILELOG = 1 << 11
# file that are not directly part of a revlog
FILEFLAGS_OTHER = 1 << 10
# the main entry point for a revlog
FILEFLAGS_REVLOG_MAIN = 1 << 1
# a secondary file for a revlog
FILEFLAGS_REVLOG_OTHER = 1 << 0
# files that are "volatile" and might change between listing and streaming
FILEFLAGS_VOLATILE = 1 << 20
FILETYPE_CHANGELOG_MAIN = FILEFLAGS_CHANGELOG | FILEFLAGS_REVLOG_MAIN
FILETYPE_CHANGELOG_OTHER = FILEFLAGS_CHANGELOG | FILEFLAGS_REVLOG_OTHER
FILETYPE_MANIFESTLOG_MAIN = FILEFLAGS_MANIFESTLOG | FILEFLAGS_REVLOG_MAIN
FILETYPE_MANIFESTLOG_OTHER = FILEFLAGS_MANIFESTLOG | FILEFLAGS_REVLOG_OTHER
FILETYPE_FILELOG_MAIN = FILEFLAGS_FILELOG | FILEFLAGS_REVLOG_MAIN
FILETYPE_FILELOG_OTHER = FILEFLAGS_FILELOG | FILEFLAGS_REVLOG_OTHER
FILETYPE_OTHER = FILEFLAGS_OTHER
@attr.s(slots=True)
class StoreFile:
"""a file matching a store entry"""
unencoded_path = attr.ib()
_file_size = attr.ib(default=None)
is_volatile = attr.ib(default=False)
def file_size(self, vfs):
if self._file_size is None:
if vfs is None:
msg = b"calling vfs-less file_size without prior call: %s"
msg %= self.unencoded_path
raise error.ProgrammingError(msg)
try:
self._file_size = vfs.stat(self.unencoded_path).st_size
except FileNotFoundError:
self._file_size = 0
return self._file_size
def get_stream(self, vfs, copies):
"""return data "stream" information for this file
(unencoded_file_path, content_iterator, content_size)
"""
size = self.file_size(None)
def get_stream():
actual_path = copies[vfs.join(self.unencoded_path)]
with open(actual_path, 'rb') as fp:
yield None # ready to stream
if size <= 65536:
yield fp.read(size)
else:
yield from util.filechunkiter(fp, limit=size)
s = get_stream()
next(s)
return (self.unencoded_path, s, size)
@attr.s(slots=True, init=False)
class BaseStoreEntry:
"""An entry in the store
This is returned by `store.walk` and represent some data in the store."""
def files(self) -> List[StoreFile]:
raise NotImplementedError
def get_streams(
self,
repo=None,
vfs=None,
copies=None,
max_changeset=None,
):
"""return a list of data stream associated to files for this entry
return [(unencoded_file_path, content_iterator, content_size), …]
"""
assert vfs is not None
return [f.get_stream(vfs, copies) for f in self.files()]
@attr.s(slots=True, init=False)
class SimpleStoreEntry(BaseStoreEntry):
"""A generic entry in the store"""
is_revlog = False
_entry_path = attr.ib()
_is_volatile = attr.ib(default=False)
_file_size = attr.ib(default=None)
_files = attr.ib(default=None)
def __init__(
self,
entry_path,
is_volatile=False,
file_size=None,
):
super().__init__()
self._entry_path = entry_path
self._is_volatile = is_volatile
self._file_size = file_size
self._files = None
def files(self) -> List[StoreFile]:
if self._files is None:
self._files = [
StoreFile(
unencoded_path=self._entry_path,
file_size=self._file_size,
is_volatile=self._is_volatile,
)
]
return self._files
@attr.s(slots=True, init=False)
class RevlogStoreEntry(BaseStoreEntry):
"""A revlog entry in the store"""
is_revlog = True
revlog_type = attr.ib(default=None)
target_id = attr.ib(default=None)
_path_prefix = attr.ib(default=None)
_details = attr.ib(default=None)
_files = attr.ib(default=None)
def __init__(
self,
revlog_type,
path_prefix,
target_id,
details,
):
super().__init__()
self.revlog_type = revlog_type
self.target_id = target_id
self._path_prefix = path_prefix
assert b'.i' in details, (path_prefix, details)
self._details = details
self._files = None
@property
def is_changelog(self):
return self.revlog_type & FILEFLAGS_CHANGELOG
@property
def is_manifestlog(self):
return self.revlog_type & FILEFLAGS_MANIFESTLOG
@property
def is_filelog(self):
return self.revlog_type & FILEFLAGS_FILELOG
def main_file_path(self):
"""unencoded path of the main revlog file"""
return self._path_prefix + b'.i'
def files(self) -> List[StoreFile]:
if self._files is None:
self._files = []
for ext in sorted(self._details, key=_ext_key):
path = self._path_prefix + ext
data = self._details[ext]
self._files.append(StoreFile(unencoded_path=path, **data))
return self._files
def get_streams(
self,
repo=None,
vfs=None,
copies=None,
max_changeset=None,
):
if repo is None or max_changeset is None:
return super().get_streams(
repo=repo,
vfs=vfs,
copies=copies,
max_changeset=max_changeset,
)
if any(k.endswith(b'.idx') for k in self._details.keys()):
# This use revlog-v2, ignore for now
return super().get_streams(
repo=repo,
vfs=vfs,
copies=copies,
max_changeset=max_changeset,
)
name_to_ext = {}
for ext in self._details.keys():
name_to_ext[self._path_prefix + ext] = ext
name_to_size = {}
for f in self.files():
name_to_size[f.unencoded_path] = f.file_size(None)
stream = [
f.get_stream(vfs, copies)
for f in self.files()
if name_to_ext[f.unencoded_path] not in (b'.d', b'.i')
]
is_inline = b'.d' not in self._details
rl = self.get_revlog_instance(repo).get_revlog()
rl_stream = rl.get_streams(max_changeset, force_inline=is_inline)
for name, s, size in rl_stream:
if name_to_size.get(name, 0) != size:
msg = _(b"expected %d bytes but %d provided for %s")
msg %= name_to_size.get(name, 0), size, name
raise error.Abort(msg)
stream.extend(rl_stream)
files = self.files()
assert len(stream) == len(files), (
stream,
files,
self._path_prefix,
self.target_id,
)
return stream
def get_revlog_instance(self, repo):
"""Obtain a revlog instance from this store entry
An instance of the appropriate class is returned.
"""
if self.is_changelog:
return changelog.changelog(repo.svfs)
elif self.is_manifestlog:
mandir = self.target_id
return manifest.manifestrevlog(
repo.nodeconstants, repo.svfs, tree=mandir
)
else:
return filelog.filelog(repo.svfs, self.target_id)
def _gather_revlog(files_data):
"""group files per revlog prefix
The returns a two level nested dict. The top level key is the revlog prefix
without extension, the second level is all the file "suffix" that were
seen for this revlog and arbitrary file data as value.
"""
revlogs = collections.defaultdict(dict)
for u, value in files_data:
name, ext = _split_revlog_ext(u)
revlogs[name][ext] = value
return sorted(revlogs.items())
def _split_revlog_ext(filename):
"""split the revlog file prefix from the variable extension"""
if filename.endswith(REVLOG_FILES_LONG_EXT):
char = b'-'
else:
char = b'.'
idx = filename.rfind(char)
return filename[:idx], filename[idx:]
def _ext_key(ext):
"""a key to order revlog suffix
important to issue .i after other entry."""
# the only important part of this order is to keep the `.i` last.
if ext.endswith(b'.n'):
return (0, ext)
elif ext.endswith(b'.nd'):
return (10, ext)
elif ext.endswith(b'.d'):
return (20, ext)
elif ext.endswith(b'.i'):
return (50, ext)
else:
return (40, ext)
class basicstore:
'''base class for local repository stores'''
def __init__(self, path, vfstype):
vfs = vfstype(path)
self.path = vfs.base
self.createmode = _calcmode(vfs)
vfs.createmode = self.createmode
self.rawvfs = vfs
self.vfs = vfsmod.filtervfs(vfs, encodedir)
self.opener = self.vfs
def join(self, f):
return self.path + b'/' + encodedir(f)
def _walk(self, relpath, recurse, undecodable=None):
'''yields (revlog_type, unencoded, size)'''
path = self.path
if relpath:
path += b'/' + relpath
striplen = len(self.path) + 1
l = []
if self.rawvfs.isdir(path):
visit = [path]
readdir = self.rawvfs.readdir
while visit:
p = visit.pop()
for f, kind, st in readdir(p, stat=True):
fp = p + b'/' + f
rl_type = is_revlog(f, kind, st)
if rl_type is not None:
n = util.pconvert(fp[striplen:])
l.append((decodedir(n), (rl_type, st.st_size)))
elif kind == stat.S_IFDIR and recurse:
visit.append(fp)
l.sort()
return l
def changelog(self, trypending, concurrencychecker=None):
return changelog.changelog(
self.vfs,
trypending=trypending,
concurrencychecker=concurrencychecker,
)
def manifestlog(self, repo, storenarrowmatch):
rootstore = manifest.manifestrevlog(repo.nodeconstants, self.vfs)
return manifest.manifestlog(self.vfs, repo, rootstore, storenarrowmatch)
def data_entries(
self, matcher=None, undecodable=None
) -> Generator[BaseStoreEntry, None, None]:
"""Like walk, but excluding the changelog and root manifest.
When [undecodable] is None, revlogs names that can't be
decoded cause an exception. When it is provided, it should
be a list and the filenames that can't be decoded are added
to it instead. This is very rarely needed."""
dirs = [
(b'data', FILEFLAGS_FILELOG, False),
(b'meta', FILEFLAGS_MANIFESTLOG, True),
]
for base_dir, rl_type, strip_filename in dirs:
files = self._walk(base_dir, True, undecodable=undecodable)
files = (f for f in files if f[1][0] is not None)
for revlog, details in _gather_revlog(files):
file_details = {}
revlog_target_id = revlog.split(b'/', 1)[1]
if strip_filename and b'/' in revlog:
revlog_target_id = revlog_target_id.rsplit(b'/', 1)[0]
revlog_target_id += b'/'
for ext, (t, s) in sorted(details.items()):
file_details[ext] = {
'is_volatile': bool(t & FILEFLAGS_VOLATILE),
'file_size': s,
}
yield RevlogStoreEntry(
path_prefix=revlog,
revlog_type=rl_type,
target_id=revlog_target_id,
details=file_details,
)
def top_entries(
self, phase=False, obsolescence=False
) -> Generator[BaseStoreEntry, None, None]:
if phase and self.vfs.exists(b'phaseroots'):
yield SimpleStoreEntry(
entry_path=b'phaseroots',
is_volatile=True,
)
if obsolescence and self.vfs.exists(b'obsstore'):
# XXX if we had the file size it could be non-volatile
yield SimpleStoreEntry(
entry_path=b'obsstore',
is_volatile=True,
)
files = reversed(self._walk(b'', False))
changelogs = collections.defaultdict(dict)
manifestlogs = collections.defaultdict(dict)
for u, (t, s) in files:
if u.startswith(b'00changelog'):
name, ext = _split_revlog_ext(u)
changelogs[name][ext] = (t, s)
elif u.startswith(b'00manifest'):
name, ext = _split_revlog_ext(u)
manifestlogs[name][ext] = (t, s)
else:
yield SimpleStoreEntry(
entry_path=u,
is_volatile=bool(t & FILEFLAGS_VOLATILE),
file_size=s,
)
# yield manifest before changelog
top_rl = [
(manifestlogs, FILEFLAGS_MANIFESTLOG),
(changelogs, FILEFLAGS_CHANGELOG),
]
assert len(manifestlogs) <= 1
assert len(changelogs) <= 1
for data, revlog_type in top_rl:
for revlog, details in sorted(data.items()):
file_details = {}
for ext, (t, s) in details.items():
file_details[ext] = {
'is_volatile': bool(t & FILEFLAGS_VOLATILE),
'file_size': s,
}
yield RevlogStoreEntry(
path_prefix=revlog,
revlog_type=revlog_type,
target_id=b'',
details=file_details,
)
def walk(
self, matcher=None, phase=False, obsolescence=False
) -> Generator[BaseStoreEntry, None, None]:
"""return files related to data storage (ie: revlogs)
yields instance from BaseStoreEntry subclasses
if a matcher is passed, storage files of only those tracked paths
are passed with matches the matcher
"""
# yield data files first
for x in self.data_entries(matcher):
yield x
for x in self.top_entries(phase=phase, obsolescence=obsolescence):
yield x
def copylist(self):
return _data
def write(self, tr):
pass
def invalidatecaches(self):
pass
def markremoved(self, fn):
pass
def __contains__(self, path):
'''Checks if the store contains path'''
path = b"/".join((b"data", path))
# file?
if self.vfs.exists(path + b".i"):
return True
# dir?
if not path.endswith(b"/"):
path = path + b"/"
return self.vfs.exists(path)
class encodedstore(basicstore):
def __init__(self, path, vfstype):
vfs = vfstype(path + b'/store')
self.path = vfs.base
self.createmode = _calcmode(vfs)
vfs.createmode = self.createmode
self.rawvfs = vfs
self.vfs = vfsmod.filtervfs(vfs, encodefilename)
self.opener = self.vfs
def _walk(self, relpath, recurse, undecodable=None):
old = super()._walk(relpath, recurse)
new = []
for f1, value in old:
try:
f2 = decodefilename(f1)
except KeyError:
if undecodable is None:
msg = _(b'undecodable revlog name %s') % f1
raise error.StorageError(msg)
else:
undecodable.append(f1)
continue
new.append((f2, value))
return new
def data_entries(
self, matcher=None, undecodable=None
) -> Generator[BaseStoreEntry, None, None]:
entries = super(encodedstore, self).data_entries(
undecodable=undecodable
)
for entry in entries:
if _match_tracked_entry(entry, matcher):
yield entry
def join(self, f):
return self.path + b'/' + encodefilename(f)
def copylist(self):
return [b'requires', b'00changelog.i'] + [b'store/' + f for f in _data]
class fncache:
# the filename used to be partially encoded
# hence the encodedir/decodedir dance
def __init__(self, vfs):
self.vfs = vfs
self._ignores = set()
self.entries = None
self._dirty = False
# set of new additions to fncache
self.addls = set()
def ensureloaded(self, warn=None):
"""read the fncache file if not already read.
If the file on disk is corrupted, raise. If warn is provided,
warn and keep going instead."""
if self.entries is None:
self._load(warn)
def _load(self, warn=None):
'''fill the entries from the fncache file'''
self._dirty = False
try:
fp = self.vfs(b'fncache', mode=b'rb')
except IOError:
# skip nonexistent file
self.entries = set()
return
self.entries = set()
chunk = b''
for c in iter(functools.partial(fp.read, fncache_chunksize), b''):
chunk += c
try:
p = chunk.rindex(b'\n')
self.entries.update(decodedir(chunk[: p + 1]).splitlines())
chunk = chunk[p + 1 :]
except ValueError:
# substring '\n' not found, maybe the entry is bigger than the
# chunksize, so let's keep iterating
pass
if chunk:
msg = _(b"fncache does not ends with a newline")
if warn:
warn(msg + b'\n')
else:
raise error.Abort(
msg,
hint=_(
b"use 'hg debugrebuildfncache' to "
b"rebuild the fncache"
),
)
self._checkentries(fp, warn)
fp.close()
def _checkentries(self, fp, warn):
"""make sure there is no empty string in entries"""
if b'' in self.entries:
fp.seek(0)
for n, line in enumerate(fp):
if not line.rstrip(b'\n'):
t = _(b'invalid entry in fncache, line %d') % (n + 1)
if warn:
warn(t + b'\n')
else:
raise error.Abort(t)
def write(self, tr):
if self._dirty:
assert self.entries is not None
self.entries = self.entries | self.addls
self.addls = set()
tr.addbackup(b'fncache')
fp = self.vfs(b'fncache', mode=b'wb', atomictemp=True)
if self.entries:
fp.write(encodedir(b'\n'.join(self.entries) + b'\n'))
fp.close()
self._dirty = False
if self.addls:
# if we have just new entries, let's append them to the fncache
tr.addbackup(b'fncache')
fp = self.vfs(b'fncache', mode=b'ab', atomictemp=True)
if self.addls:
fp.write(encodedir(b'\n'.join(self.addls) + b'\n'))
fp.close()
self.entries = None
self.addls = set()
def addignore(self, fn):
self._ignores.add(fn)
def add(self, fn):
if fn in self._ignores:
return
if self.entries is None:
self._load()
if fn not in self.entries:
self.addls.add(fn)
def remove(self, fn):
if self.entries is None:
self._load()
if fn in self.addls:
self.addls.remove(fn)
return
try:
self.entries.remove(fn)
self._dirty = True
except KeyError:
pass
def __contains__(self, fn):
if fn in self.addls:
return True
if self.entries is None:
self._load()
return fn in self.entries
def __iter__(self):
if self.entries is None:
self._load()
return iter(self.entries | self.addls)
class _fncachevfs(vfsmod.proxyvfs):
def __init__(self, vfs, fnc, encode):
vfsmod.proxyvfs.__init__(self, vfs)
self.fncache = fnc
self.encode = encode
def __call__(self, path, mode=b'r', *args, **kw):
encoded = self.encode(path)
if (
mode not in (b'r', b'rb')
and (path.startswith(b'data/') or path.startswith(b'meta/'))
and revlog_type(path) is not None
):
# do not trigger a fncache load when adding a file that already is
# known to exist.
notload = self.fncache.entries is None and self.vfs.exists(encoded)
if notload and b'r+' in mode and not self.vfs.stat(encoded).st_size:
# when appending to an existing file, if the file has size zero,
# it should be considered as missing. Such zero-size files are
# the result of truncation when a transaction is aborted.
notload = False
if not notload:
self.fncache.add(path)
return self.vfs(encoded, mode, *args, **kw)
def join(self, path):
if path:
return self.vfs.join(self.encode(path))
else:
return self.vfs.join(path)
def register_file(self, path):
"""generic hook point to lets fncache steer its stew"""
if path.startswith(b'data/') or path.startswith(b'meta/'):
self.fncache.add(path)
class fncachestore(basicstore):
def __init__(self, path, vfstype, dotencode):
if dotencode:
encode = _pathencode
else:
encode = _plainhybridencode
self.encode = encode
vfs = vfstype(path + b'/store')
self.path = vfs.base
self.pathsep = self.path + b'/'
self.createmode = _calcmode(vfs)
vfs.createmode = self.createmode
self.rawvfs = vfs
fnc = fncache(vfs)
self.fncache = fnc
self.vfs = _fncachevfs(vfs, fnc, encode)
self.opener = self.vfs
def join(self, f):
return self.pathsep + self.encode(f)
def getsize(self, path):
return self.rawvfs.stat(path).st_size
def data_entries(
self, matcher=None, undecodable=None
) -> Generator[BaseStoreEntry, None, None]:
files = ((f, revlog_type(f)) for f in self.fncache)
# Note: all files in fncache should be revlog related, However the
# fncache might contains such file added by previous version of
# Mercurial.
files = (f for f in files if f[1] is not None)
by_revlog = _gather_revlog(files)
for revlog, details in by_revlog:
file_details = {}
if revlog.startswith(b'data/'):
rl_type = FILEFLAGS_FILELOG
revlog_target_id = revlog.split(b'/', 1)[1]
elif revlog.startswith(b'meta/'):
rl_type = FILEFLAGS_MANIFESTLOG
# drop the initial directory and the `00manifest` file part
tmp = revlog.split(b'/', 1)[1]
revlog_target_id = tmp.rsplit(b'/', 1)[0] + b'/'
else:
# unreachable
assert False, revlog
for ext, t in details.items():
file_details[ext] = {
'is_volatile': bool(t & FILEFLAGS_VOLATILE),
}
entry = RevlogStoreEntry(
path_prefix=revlog,
revlog_type=rl_type,
target_id=revlog_target_id,
details=file_details,
)
if _match_tracked_entry(entry, matcher):
yield entry
def copylist(self):
d = (
b'bookmarks',
b'narrowspec',
b'data',
b'meta',
b'dh',
b'fncache',
b'phaseroots',
b'obsstore',
b'00manifest.d',
b'00manifest.i',
b'00changelog.d',
b'00changelog.i',
b'requires',
)
return [b'requires', b'00changelog.i'] + [b'store/' + f for f in d]
def write(self, tr):
self.fncache.write(tr)
def invalidatecaches(self):
self.fncache.entries = None
self.fncache.addls = set()
def markremoved(self, fn):
self.fncache.remove(fn)
def _exists(self, f):
ef = self.encode(f)
try:
self.getsize(ef)
return True
except FileNotFoundError:
return False
def __contains__(self, path):
'''Checks if the store contains path'''
path = b"/".join((b"data", path))
# check for files (exact match)
e = path + b'.i'
if e in self.fncache and self._exists(e):
return True
# now check for directories (prefix match)
if not path.endswith(b'/'):
path += b'/'
for e in self.fncache:
if e.startswith(path) and self._exists(e):
return True
return False