changing-files: retrieve changelogrevision.files from the sidedata block
The `files` field is know to have issue, using a list with fixed, and fixable,
computation can only help. For example, using a fixes `files` field would be
enough to fix issue6219 once this feature get usable in production.
We focus on having thing working for now, we will deal with performance later.
Right now we have a ironic situation were we parse sorted value from disk to
turn them into a set and then having to sort it again.
Differential Revision: https://phab.mercurial-scm.org/D9092
# changelog.py - changelog 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
from .i18n import _
from .node import (
bin,
hex,
nullid,
)
from .thirdparty import attr
from . import (
encoding,
error,
metadata,
pycompat,
revlog,
)
from .utils import (
dateutil,
stringutil,
)
_defaultextra = {b'branch': b'default'}
def _string_escape(text):
"""
>>> from .pycompat import bytechr as chr
>>> d = {b'nl': chr(10), b'bs': chr(92), b'cr': chr(13), b'nul': chr(0)}
>>> s = b"ab%(nl)scd%(bs)s%(bs)sn%(nul)s12ab%(cr)scd%(bs)s%(nl)s" % d
>>> s
'ab\\ncd\\\\\\\\n\\x0012ab\\rcd\\\\\\n'
>>> res = _string_escape(s)
>>> s == _string_unescape(res)
True
"""
# subset of the string_escape codec
text = (
text.replace(b'\\', b'\\\\')
.replace(b'\n', b'\\n')
.replace(b'\r', b'\\r')
)
return text.replace(b'\0', b'\\0')
def _string_unescape(text):
if b'\\0' in text:
# fix up \0 without getting into trouble with \\0
text = text.replace(b'\\\\', b'\\\\\n')
text = text.replace(b'\\0', b'\0')
text = text.replace(b'\n', b'')
return stringutil.unescapestr(text)
def decodeextra(text):
"""
>>> from .pycompat import bytechr as chr
>>> sorted(decodeextra(encodeextra({b'foo': b'bar', b'baz': chr(0) + b'2'})
... ).items())
[('baz', '\\x002'), ('branch', 'default'), ('foo', 'bar')]
>>> sorted(decodeextra(encodeextra({b'foo': b'bar',
... b'baz': chr(92) + chr(0) + b'2'})
... ).items())
[('baz', '\\\\\\x002'), ('branch', 'default'), ('foo', 'bar')]
"""
extra = _defaultextra.copy()
for l in text.split(b'\0'):
if l:
k, v = _string_unescape(l).split(b':', 1)
extra[k] = v
return extra
def encodeextra(d):
# keys must be sorted to produce a deterministic changelog entry
items = [_string_escape(b'%s:%s' % (k, d[k])) for k in sorted(d)]
return b"\0".join(items)
def stripdesc(desc):
"""strip trailing whitespace and leading and trailing empty lines"""
return b'\n'.join([l.rstrip() for l in desc.splitlines()]).strip(b'\n')
class appender(object):
'''the changelog index must be updated last on disk, so we use this class
to delay writes to it'''
def __init__(self, vfs, name, mode, buf):
self.data = buf
fp = vfs(name, mode)
self.fp = fp
self.offset = fp.tell()
self.size = vfs.fstat(fp).st_size
self._end = self.size
def end(self):
return self._end
def tell(self):
return self.offset
def flush(self):
pass
@property
def closed(self):
return self.fp.closed
def close(self):
self.fp.close()
def seek(self, offset, whence=0):
'''virtual file offset spans real file and data'''
if whence == 0:
self.offset = offset
elif whence == 1:
self.offset += offset
elif whence == 2:
self.offset = self.end() + offset
if self.offset < self.size:
self.fp.seek(self.offset)
def read(self, count=-1):
'''only trick here is reads that span real file and data'''
ret = b""
if self.offset < self.size:
s = self.fp.read(count)
ret = s
self.offset += len(s)
if count > 0:
count -= len(s)
if count != 0:
doff = self.offset - self.size
self.data.insert(0, b"".join(self.data))
del self.data[1:]
s = self.data[0][doff : doff + count]
self.offset += len(s)
ret += s
return ret
def write(self, s):
self.data.append(bytes(s))
self.offset += len(s)
self._end += len(s)
def __enter__(self):
self.fp.__enter__()
return self
def __exit__(self, *args):
return self.fp.__exit__(*args)
class _divertopener(object):
def __init__(self, opener, target):
self._opener = opener
self._target = target
def __call__(self, name, mode=b'r', checkambig=False, **kwargs):
if name != self._target:
return self._opener(name, mode, **kwargs)
return self._opener(name + b".a", mode, **kwargs)
def __getattr__(self, attr):
return getattr(self._opener, attr)
def _delayopener(opener, target, buf):
"""build an opener that stores chunks in 'buf' instead of 'target'"""
def _delay(name, mode=b'r', checkambig=False, **kwargs):
if name != target:
return opener(name, mode, **kwargs)
assert not kwargs
return appender(opener, name, mode, buf)
return _delay
@attr.s
class _changelogrevision(object):
# Extensions might modify _defaultextra, so let the constructor below pass
# it in
extra = attr.ib()
manifest = attr.ib(default=nullid)
user = attr.ib(default=b'')
date = attr.ib(default=(0, 0))
files = attr.ib(default=attr.Factory(list))
filesadded = attr.ib(default=None)
filesremoved = attr.ib(default=None)
p1copies = attr.ib(default=None)
p2copies = attr.ib(default=None)
description = attr.ib(default=b'')
class changelogrevision(object):
"""Holds results of a parsed changelog revision.
Changelog revisions consist of multiple pieces of data, including
the manifest node, user, and date. This object exposes a view into
the parsed object.
"""
__slots__ = (
'_offsets',
'_text',
'_sidedata',
'_cpsd',
'_changes',
)
def __new__(cls, text, sidedata, cpsd):
if not text:
return _changelogrevision(extra=_defaultextra)
self = super(changelogrevision, cls).__new__(cls)
# We could return here and implement the following as an __init__.
# But doing it here is equivalent and saves an extra function call.
# format used:
# nodeid\n : manifest node in ascii
# user\n : user, no \n or \r allowed
# time tz extra\n : date (time is int or float, timezone is int)
# : extra is metadata, encoded and separated by '\0'
# : older versions ignore it
# files\n\n : files modified by the cset, no \n or \r allowed
# (.*) : comment (free text, ideally utf-8)
#
# changelog v0 doesn't use extra
nl1 = text.index(b'\n')
nl2 = text.index(b'\n', nl1 + 1)
nl3 = text.index(b'\n', nl2 + 1)
# The list of files may be empty. Which means nl3 is the first of the
# double newline that precedes the description.
if text[nl3 + 1 : nl3 + 2] == b'\n':
doublenl = nl3
else:
doublenl = text.index(b'\n\n', nl3 + 1)
self._offsets = (nl1, nl2, nl3, doublenl)
self._text = text
self._sidedata = sidedata
self._cpsd = cpsd
self._changes = None
return self
@property
def manifest(self):
return bin(self._text[0 : self._offsets[0]])
@property
def user(self):
off = self._offsets
return encoding.tolocal(self._text[off[0] + 1 : off[1]])
@property
def _rawdate(self):
off = self._offsets
dateextra = self._text[off[1] + 1 : off[2]]
return dateextra.split(b' ', 2)[0:2]
@property
def _rawextra(self):
off = self._offsets
dateextra = self._text[off[1] + 1 : off[2]]
fields = dateextra.split(b' ', 2)
if len(fields) != 3:
return None
return fields[2]
@property
def date(self):
raw = self._rawdate
time = float(raw[0])
# Various tools did silly things with the timezone.
try:
timezone = int(raw[1])
except ValueError:
timezone = 0
return time, timezone
@property
def extra(self):
raw = self._rawextra
if raw is None:
return _defaultextra
return decodeextra(raw)
@property
def changes(self):
if self._changes is not None:
return self._changes
if self._cpsd:
changes = metadata.decode_files_sidedata(self._sidedata)
else:
changes = metadata.ChangingFiles(
touched=self.files or (),
added=self.filesadded or (),
removed=self.filesremoved or (),
p1_copies=self.p1copies or {},
p2_copies=self.p2copies or {},
)
self._changes = changes
return changes
@property
def files(self):
if self._cpsd:
return sorted(self.changes.touched)
off = self._offsets
if off[2] == off[3]:
return []
return self._text[off[2] + 1 : off[3]].split(b'\n')
@property
def filesadded(self):
if self._cpsd:
return self.changes.added
else:
rawindices = self.extra.get(b'filesadded')
if rawindices is None:
return None
return metadata.decodefileindices(self.files, rawindices)
@property
def filesremoved(self):
if self._cpsd:
return self.changes.removed
else:
rawindices = self.extra.get(b'filesremoved')
if rawindices is None:
return None
return metadata.decodefileindices(self.files, rawindices)
@property
def p1copies(self):
if self._cpsd:
return self.changes.copied_from_p1
else:
rawcopies = self.extra.get(b'p1copies')
if rawcopies is None:
return None
return metadata.decodecopies(self.files, rawcopies)
@property
def p2copies(self):
if self._cpsd:
return self.changes.copied_from_p2
else:
rawcopies = self.extra.get(b'p2copies')
if rawcopies is None:
return None
return metadata.decodecopies(self.files, rawcopies)
@property
def description(self):
return encoding.tolocal(self._text[self._offsets[3] + 2 :])
class changelog(revlog.revlog):
def __init__(self, opener, trypending=False):
"""Load a changelog revlog using an opener.
If ``trypending`` is true, we attempt to load the index from a
``00changelog.i.a`` file instead of the default ``00changelog.i``.
The ``00changelog.i.a`` file contains index (and possibly inline
revision) data for a transaction that hasn't been finalized yet.
It exists in a separate file to facilitate readers (such as
hooks processes) accessing data before a transaction is finalized.
"""
if trypending and opener.exists(b'00changelog.i.a'):
indexfile = b'00changelog.i.a'
else:
indexfile = b'00changelog.i'
datafile = b'00changelog.d'
revlog.revlog.__init__(
self,
opener,
indexfile,
datafile=datafile,
checkambig=True,
mmaplargeindex=True,
persistentnodemap=opener.options.get(b'persistent-nodemap', False),
)
if self._initempty and (self.version & 0xFFFF == revlog.REVLOGV1):
# changelogs don't benefit from generaldelta.
self.version &= ~revlog.FLAG_GENERALDELTA
self._generaldelta = False
# Delta chains for changelogs tend to be very small because entries
# tend to be small and don't delta well with each. So disable delta
# chains.
self._storedeltachains = False
self._realopener = opener
self._delayed = False
self._delaybuf = None
self._divert = False
self._filteredrevs = frozenset()
self._filteredrevs_hashcache = {}
self._copiesstorage = opener.options.get(b'copies-storage')
@property
def filteredrevs(self):
return self._filteredrevs
@filteredrevs.setter
def filteredrevs(self, val):
# Ensure all updates go through this function
assert isinstance(val, frozenset)
self._filteredrevs = val
self._filteredrevs_hashcache = {}
def delayupdate(self, tr):
"""delay visibility of index updates to other readers"""
if not self._delayed:
if len(self) == 0:
self._divert = True
if self._realopener.exists(self.indexfile + b'.a'):
self._realopener.unlink(self.indexfile + b'.a')
self.opener = _divertopener(self._realopener, self.indexfile)
else:
self._delaybuf = []
self.opener = _delayopener(
self._realopener, self.indexfile, self._delaybuf
)
self._delayed = True
tr.addpending(b'cl-%i' % id(self), self._writepending)
tr.addfinalize(b'cl-%i' % id(self), self._finalize)
def _finalize(self, tr):
"""finalize index updates"""
self._delayed = False
self.opener = self._realopener
# move redirected index data back into place
if self._divert:
assert not self._delaybuf
tmpname = self.indexfile + b".a"
nfile = self.opener.open(tmpname)
nfile.close()
self.opener.rename(tmpname, self.indexfile, checkambig=True)
elif self._delaybuf:
fp = self.opener(self.indexfile, b'a', checkambig=True)
fp.write(b"".join(self._delaybuf))
fp.close()
self._delaybuf = None
self._divert = False
# split when we're done
self._enforceinlinesize(tr)
def _writepending(self, tr):
"""create a file containing the unfinalized state for
pretxnchangegroup"""
if self._delaybuf:
# make a temporary copy of the index
fp1 = self._realopener(self.indexfile)
pendingfilename = self.indexfile + b".a"
# register as a temp file to ensure cleanup on failure
tr.registertmp(pendingfilename)
# write existing data
fp2 = self._realopener(pendingfilename, b"w")
fp2.write(fp1.read())
# add pending data
fp2.write(b"".join(self._delaybuf))
fp2.close()
# switch modes so finalize can simply rename
self._delaybuf = None
self._divert = True
self.opener = _divertopener(self._realopener, self.indexfile)
if self._divert:
return True
return False
def _enforceinlinesize(self, tr, fp=None):
if not self._delayed:
revlog.revlog._enforceinlinesize(self, tr, fp)
def read(self, node):
"""Obtain data from a parsed changelog revision.
Returns a 6-tuple of:
- manifest node in binary
- author/user as a localstr
- date as a 2-tuple of (time, timezone)
- list of files
- commit message as a localstr
- dict of extra metadata
Unless you need to access all fields, consider calling
``changelogrevision`` instead, as it is faster for partial object
access.
"""
d, s = self._revisiondata(node)
c = changelogrevision(
d, s, self._copiesstorage == b'changeset-sidedata'
)
return (c.manifest, c.user, c.date, c.files, c.description, c.extra)
def changelogrevision(self, nodeorrev):
"""Obtain a ``changelogrevision`` for a node or revision."""
text, sidedata = self._revisiondata(nodeorrev)
return changelogrevision(
text, sidedata, self._copiesstorage == b'changeset-sidedata'
)
def readfiles(self, node):
"""
short version of read that only returns the files modified by the cset
"""
text = self.revision(node)
if not text:
return []
last = text.index(b"\n\n")
l = text[:last].split(b'\n')
return l[3:]
def add(
self,
manifest,
files,
desc,
transaction,
p1,
p2,
user,
date=None,
extra=None,
):
# Convert to UTF-8 encoded bytestrings as the very first
# thing: calling any method on a localstr object will turn it
# into a str object and the cached UTF-8 string is thus lost.
user, desc = encoding.fromlocal(user), encoding.fromlocal(desc)
user = user.strip()
# An empty username or a username with a "\n" will make the
# revision text contain two "\n\n" sequences -> corrupt
# repository since read cannot unpack the revision.
if not user:
raise error.StorageError(_(b"empty username"))
if b"\n" in user:
raise error.StorageError(
_(b"username %r contains a newline") % pycompat.bytestr(user)
)
desc = stripdesc(desc)
if date:
parseddate = b"%d %d" % dateutil.parsedate(date)
else:
parseddate = b"%d %d" % dateutil.makedate()
if extra:
branch = extra.get(b"branch")
if branch in (b"default", b""):
del extra[b"branch"]
elif branch in (b".", b"null", b"tip"):
raise error.StorageError(
_(b'the name \'%s\' is reserved') % branch
)
sortedfiles = sorted(files.touched)
sidedata = None
if self._copiesstorage == b'changeset-sidedata':
sidedata = metadata.encode_files_sidedata(files)
if extra:
extra = encodeextra(extra)
parseddate = b"%s %s" % (parseddate, extra)
l = [hex(manifest), user, parseddate] + sortedfiles + [b"", desc]
text = b"\n".join(l)
return self.addrevision(
text, transaction, len(self), p1, p2, sidedata=sidedata
)
def branchinfo(self, rev):
"""return the branch name and open/close state of a revision
This function exists because creating a changectx object
just to access this is costly."""
extra = self.read(rev)[5]
return encoding.tolocal(extra.get(b"branch")), b'close' in extra
def _nodeduplicatecallback(self, transaction, node):
# keep track of revisions that got "re-added", eg: unbunde of know rev.
#
# We track them in a list to preserve their order from the source bundle
duplicates = transaction.changes.setdefault(b'revduplicates', [])
duplicates.append(self.rev(node))