releasenotes: fix documentation of similaritycheck()
The function document says that it returns true when the fragment can be merged,
but if you see the function just above it which is similar(), it writes already
exists thing if return value from similaritycheck() is False which is just
opposite of the doc. This patch fixes that.
Differential Revision: https://phab.mercurial-scm.org/D1119
# changegroup.py - Mercurial changegroup manipulation functions
#
# Copyright 2006 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 os
import struct
import tempfile
import weakref
from .i18n import _
from .node import (
hex,
nullrev,
short,
)
from . import (
dagutil,
error,
mdiff,
phases,
pycompat,
util,
)
_CHANGEGROUPV1_DELTA_HEADER = "20s20s20s20s"
_CHANGEGROUPV2_DELTA_HEADER = "20s20s20s20s20s"
_CHANGEGROUPV3_DELTA_HEADER = ">20s20s20s20s20sH"
def readexactly(stream, n):
'''read n bytes from stream.read and abort if less was available'''
s = stream.read(n)
if len(s) < n:
raise error.Abort(_("stream ended unexpectedly"
" (got %d bytes, expected %d)")
% (len(s), n))
return s
def getchunk(stream):
"""return the next chunk from stream as a string"""
d = readexactly(stream, 4)
l = struct.unpack(">l", d)[0]
if l <= 4:
if l:
raise error.Abort(_("invalid chunk length %d") % l)
return ""
return readexactly(stream, l - 4)
def chunkheader(length):
"""return a changegroup chunk header (string)"""
return struct.pack(">l", length + 4)
def closechunk():
"""return a changegroup chunk header (string) for a zero-length chunk"""
return struct.pack(">l", 0)
def writechunks(ui, chunks, filename, vfs=None):
"""Write chunks to a file and return its filename.
The stream is assumed to be a bundle file.
Existing files will not be overwritten.
If no filename is specified, a temporary file is created.
"""
fh = None
cleanup = None
try:
if filename:
if vfs:
fh = vfs.open(filename, "wb")
else:
# Increase default buffer size because default is usually
# small (4k is common on Linux).
fh = open(filename, "wb", 131072)
else:
fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
fh = os.fdopen(fd, pycompat.sysstr("wb"))
cleanup = filename
for c in chunks:
fh.write(c)
cleanup = None
return filename
finally:
if fh is not None:
fh.close()
if cleanup is not None:
if filename and vfs:
vfs.unlink(cleanup)
else:
os.unlink(cleanup)
class cg1unpacker(object):
"""Unpacker for cg1 changegroup streams.
A changegroup unpacker handles the framing of the revision data in
the wire format. Most consumers will want to use the apply()
method to add the changes from the changegroup to a repository.
If you're forwarding a changegroup unmodified to another consumer,
use getchunks(), which returns an iterator of changegroup
chunks. This is mostly useful for cases where you need to know the
data stream has ended by observing the end of the changegroup.
deltachunk() is useful only if you're applying delta data. Most
consumers should prefer apply() instead.
A few other public methods exist. Those are used only for
bundlerepo and some debug commands - their use is discouraged.
"""
deltaheader = _CHANGEGROUPV1_DELTA_HEADER
deltaheadersize = struct.calcsize(deltaheader)
version = '01'
_grouplistcount = 1 # One list of files after the manifests
def __init__(self, fh, alg, extras=None):
if alg is None:
alg = 'UN'
if alg not in util.compengines.supportedbundletypes:
raise error.Abort(_('unknown stream compression type: %s')
% alg)
if alg == 'BZ':
alg = '_truncatedBZ'
compengine = util.compengines.forbundletype(alg)
self._stream = compengine.decompressorreader(fh)
self._type = alg
self.extras = extras or {}
self.callback = None
# These methods (compressed, read, seek, tell) all appear to only
# be used by bundlerepo, but it's a little hard to tell.
def compressed(self):
return self._type is not None and self._type != 'UN'
def read(self, l):
return self._stream.read(l)
def seek(self, pos):
return self._stream.seek(pos)
def tell(self):
return self._stream.tell()
def close(self):
return self._stream.close()
def _chunklength(self):
d = readexactly(self._stream, 4)
l = struct.unpack(">l", d)[0]
if l <= 4:
if l:
raise error.Abort(_("invalid chunk length %d") % l)
return 0
if self.callback:
self.callback()
return l - 4
def changelogheader(self):
"""v10 does not have a changelog header chunk"""
return {}
def manifestheader(self):
"""v10 does not have a manifest header chunk"""
return {}
def filelogheader(self):
"""return the header of the filelogs chunk, v10 only has the filename"""
l = self._chunklength()
if not l:
return {}
fname = readexactly(self._stream, l)
return {'filename': fname}
def _deltaheader(self, headertuple, prevnode):
node, p1, p2, cs = headertuple
if prevnode is None:
deltabase = p1
else:
deltabase = prevnode
flags = 0
return node, p1, p2, deltabase, cs, flags
def deltachunk(self, prevnode):
l = self._chunklength()
if not l:
return {}
headerdata = readexactly(self._stream, self.deltaheadersize)
header = struct.unpack(self.deltaheader, headerdata)
delta = readexactly(self._stream, l - self.deltaheadersize)
node, p1, p2, deltabase, cs, flags = self._deltaheader(header, prevnode)
return (node, p1, p2, cs, deltabase, delta, flags)
def getchunks(self):
"""returns all the chunks contains in the bundle
Used when you need to forward the binary stream to a file or another
network API. To do so, it parse the changegroup data, otherwise it will
block in case of sshrepo because it don't know the end of the stream.
"""
# For changegroup 1 and 2, we expect 3 parts: changelog, manifestlog,
# and a list of filelogs. For changegroup 3, we expect 4 parts:
# changelog, manifestlog, a list of tree manifestlogs, and a list of
# filelogs.
#
# Changelog and manifestlog parts are terminated with empty chunks. The
# tree and file parts are a list of entry sections. Each entry section
# is a series of chunks terminating in an empty chunk. The list of these
# entry sections is terminated in yet another empty chunk, so we know
# we've reached the end of the tree/file list when we reach an empty
# chunk that was proceeded by no non-empty chunks.
parts = 0
while parts < 2 + self._grouplistcount:
noentries = True
while True:
chunk = getchunk(self)
if not chunk:
# The first two empty chunks represent the end of the
# changelog and the manifestlog portions. The remaining
# empty chunks represent either A) the end of individual
# tree or file entries in the file list, or B) the end of
# the entire list. It's the end of the entire list if there
# were no entries (i.e. noentries is True).
if parts < 2:
parts += 1
elif noentries:
parts += 1
break
noentries = False
yield chunkheader(len(chunk))
pos = 0
while pos < len(chunk):
next = pos + 2**20
yield chunk[pos:next]
pos = next
yield closechunk()
def _unpackmanifests(self, repo, revmap, trp, prog, numchanges):
# We know that we'll never have more manifests than we had
# changesets.
self.callback = prog(_('manifests'), numchanges)
# no need to check for empty manifest group here:
# if the result of the merge of 1 and 2 is the same in 3 and 4,
# no new manifest will be created and the manifest group will
# be empty during the pull
self.manifestheader()
deltas = self.deltaiter()
repo.manifestlog._revlog.addgroup(deltas, revmap, trp)
repo.ui.progress(_('manifests'), None)
self.callback = None
def apply(self, repo, tr, srctype, url, targetphase=phases.draft,
expectedtotal=None):
"""Add the changegroup returned by source.read() to this repo.
srctype is a string like 'push', 'pull', or 'unbundle'. url is
the URL of the repo where this changegroup is coming from.
Return an integer summarizing the change to this repo:
- nothing changed or no source: 0
- more heads than before: 1+added heads (2..n)
- fewer heads than before: -1-removed heads (-2..-n)
- number of heads stays the same: 1
"""
repo = repo.unfiltered()
def csmap(x):
repo.ui.debug("add changeset %s\n" % short(x))
return len(cl)
def revmap(x):
return cl.rev(x)
changesets = files = revisions = 0
try:
# The transaction may already carry source information. In this
# case we use the top level data. We overwrite the argument
# because we need to use the top level value (if they exist)
# in this function.
srctype = tr.hookargs.setdefault('source', srctype)
url = tr.hookargs.setdefault('url', url)
repo.hook('prechangegroup',
throw=True, **pycompat.strkwargs(tr.hookargs))
# write changelog data to temp files so concurrent readers
# will not see an inconsistent view
cl = repo.changelog
cl.delayupdate(tr)
oldheads = set(cl.heads())
trp = weakref.proxy(tr)
# pull off the changeset group
repo.ui.status(_("adding changesets\n"))
clstart = len(cl)
class prog(object):
def __init__(self, step, total):
self._step = step
self._total = total
self._count = 1
def __call__(self):
repo.ui.progress(self._step, self._count, unit=_('chunks'),
total=self._total)
self._count += 1
self.callback = prog(_('changesets'), expectedtotal)
efiles = set()
def onchangelog(cl, node):
efiles.update(cl.readfiles(node))
self.changelogheader()
deltas = self.deltaiter()
cgnodes = cl.addgroup(deltas, csmap, trp, addrevisioncb=onchangelog)
efiles = len(efiles)
if not cgnodes:
repo.ui.develwarn('applied empty changegroup',
config='warn-empty-changegroup')
clend = len(cl)
changesets = clend - clstart
repo.ui.progress(_('changesets'), None)
self.callback = None
# pull off the manifest group
repo.ui.status(_("adding manifests\n"))
self._unpackmanifests(repo, revmap, trp, prog, changesets)
needfiles = {}
if repo.ui.configbool('server', 'validate'):
cl = repo.changelog
ml = repo.manifestlog
# validate incoming csets have their manifests
for cset in xrange(clstart, clend):
mfnode = cl.changelogrevision(cset).manifest
mfest = ml[mfnode].readdelta()
# store file cgnodes we must see
for f, n in mfest.iteritems():
needfiles.setdefault(f, set()).add(n)
# process the files
repo.ui.status(_("adding file changes\n"))
newrevs, newfiles = _addchangegroupfiles(
repo, self, revmap, trp, efiles, needfiles)
revisions += newrevs
files += newfiles
deltaheads = 0
if oldheads:
heads = cl.heads()
deltaheads = len(heads) - len(oldheads)
for h in heads:
if h not in oldheads and repo[h].closesbranch():
deltaheads -= 1
htext = ""
if deltaheads:
htext = _(" (%+d heads)") % deltaheads
repo.ui.status(_("added %d changesets"
" with %d changes to %d files%s\n")
% (changesets, revisions, files, htext))
repo.invalidatevolatilesets()
if changesets > 0:
if 'node' not in tr.hookargs:
tr.hookargs['node'] = hex(cl.node(clstart))
tr.hookargs['node_last'] = hex(cl.node(clend - 1))
hookargs = dict(tr.hookargs)
else:
hookargs = dict(tr.hookargs)
hookargs['node'] = hex(cl.node(clstart))
hookargs['node_last'] = hex(cl.node(clend - 1))
repo.hook('pretxnchangegroup',
throw=True, **pycompat.strkwargs(hookargs))
added = [cl.node(r) for r in xrange(clstart, clend)]
phaseall = None
if srctype in ('push', 'serve'):
# Old servers can not push the boundary themselves.
# New servers won't push the boundary if changeset already
# exists locally as secret
#
# We should not use added here but the list of all change in
# the bundle
if repo.publishing():
targetphase = phaseall = phases.public
else:
# closer target phase computation
# Those changesets have been pushed from the
# outside, their phases are going to be pushed
# alongside. Therefor `targetphase` is
# ignored.
targetphase = phaseall = phases.draft
if added:
phases.registernew(repo, tr, targetphase, added)
if phaseall is not None:
phases.advanceboundary(repo, tr, phaseall, cgnodes)
if changesets > 0:
def runhooks():
# These hooks run when the lock releases, not when the
# transaction closes. So it's possible for the changelog
# to have changed since we last saw it.
if clstart >= len(repo):
return
repo.hook("changegroup", **pycompat.strkwargs(hookargs))
for n in added:
args = hookargs.copy()
args['node'] = hex(n)
del args['node_last']
repo.hook("incoming", **pycompat.strkwargs(args))
newheads = [h for h in repo.heads()
if h not in oldheads]
repo.ui.log("incoming",
"%s incoming changes - new heads: %s\n",
len(added),
', '.join([hex(c[:6]) for c in newheads]))
tr.addpostclose('changegroup-runhooks-%020i' % clstart,
lambda tr: repo._afterlock(runhooks))
finally:
repo.ui.flush()
# never return 0 here:
if deltaheads < 0:
ret = deltaheads - 1
else:
ret = deltaheads + 1
return ret
def deltaiter(self):
"""
returns an iterator of the deltas in this changegroup
Useful for passing to the underlying storage system to be stored.
"""
chain = None
for chunkdata in iter(lambda: self.deltachunk(chain), {}):
# Chunkdata: (node, p1, p2, cs, deltabase, delta, flags)
yield chunkdata
chain = chunkdata[0]
class cg2unpacker(cg1unpacker):
"""Unpacker for cg2 streams.
cg2 streams add support for generaldelta, so the delta header
format is slightly different. All other features about the data
remain the same.
"""
deltaheader = _CHANGEGROUPV2_DELTA_HEADER
deltaheadersize = struct.calcsize(deltaheader)
version = '02'
def _deltaheader(self, headertuple, prevnode):
node, p1, p2, deltabase, cs = headertuple
flags = 0
return node, p1, p2, deltabase, cs, flags
class cg3unpacker(cg2unpacker):
"""Unpacker for cg3 streams.
cg3 streams add support for exchanging treemanifests and revlog
flags. It adds the revlog flags to the delta header and an empty chunk
separating manifests and files.
"""
deltaheader = _CHANGEGROUPV3_DELTA_HEADER
deltaheadersize = struct.calcsize(deltaheader)
version = '03'
_grouplistcount = 2 # One list of manifests and one list of files
def _deltaheader(self, headertuple, prevnode):
node, p1, p2, deltabase, cs, flags = headertuple
return node, p1, p2, deltabase, cs, flags
def _unpackmanifests(self, repo, revmap, trp, prog, numchanges):
super(cg3unpacker, self)._unpackmanifests(repo, revmap, trp, prog,
numchanges)
for chunkdata in iter(self.filelogheader, {}):
# If we get here, there are directory manifests in the changegroup
d = chunkdata["filename"]
repo.ui.debug("adding %s revisions\n" % d)
dirlog = repo.manifestlog._revlog.dirlog(d)
deltas = self.deltaiter()
if not dirlog.addgroup(deltas, revmap, trp):
raise error.Abort(_("received dir revlog group is empty"))
class headerlessfixup(object):
def __init__(self, fh, h):
self._h = h
self._fh = fh
def read(self, n):
if self._h:
d, self._h = self._h[:n], self._h[n:]
if len(d) < n:
d += readexactly(self._fh, n - len(d))
return d
return readexactly(self._fh, n)
class cg1packer(object):
deltaheader = _CHANGEGROUPV1_DELTA_HEADER
version = '01'
def __init__(self, repo, bundlecaps=None):
"""Given a source repo, construct a bundler.
bundlecaps is optional and can be used to specify the set of
capabilities which can be used to build the bundle. While bundlecaps is
unused in core Mercurial, extensions rely on this feature to communicate
capabilities to customize the changegroup packer.
"""
# Set of capabilities we can use to build the bundle.
if bundlecaps is None:
bundlecaps = set()
self._bundlecaps = bundlecaps
# experimental config: bundle.reorder
reorder = repo.ui.config('bundle', 'reorder')
if reorder == 'auto':
reorder = None
else:
reorder = util.parsebool(reorder)
self._repo = repo
self._reorder = reorder
self._progress = repo.ui.progress
if self._repo.ui.verbose and not self._repo.ui.debugflag:
self._verbosenote = self._repo.ui.note
else:
self._verbosenote = lambda s: None
def close(self):
return closechunk()
def fileheader(self, fname):
return chunkheader(len(fname)) + fname
# Extracted both for clarity and for overriding in extensions.
def _sortgroup(self, revlog, nodelist, lookup):
"""Sort nodes for change group and turn them into revnums."""
# for generaldelta revlogs, we linearize the revs; this will both be
# much quicker and generate a much smaller bundle
if (revlog._generaldelta and self._reorder is None) or self._reorder:
dag = dagutil.revlogdag(revlog)
return dag.linearize(set(revlog.rev(n) for n in nodelist))
else:
return sorted([revlog.rev(n) for n in nodelist])
def group(self, nodelist, revlog, lookup, units=None):
"""Calculate a delta group, yielding a sequence of changegroup chunks
(strings).
Given a list of changeset revs, return a set of deltas and
metadata corresponding to nodes. The first delta is
first parent(nodelist[0]) -> nodelist[0], the receiver is
guaranteed to have this parent as it has all history before
these changesets. In the case firstparent is nullrev the
changegroup starts with a full revision.
If units is not None, progress detail will be generated, units specifies
the type of revlog that is touched (changelog, manifest, etc.).
"""
# if we don't have any revisions touched by these changesets, bail
if len(nodelist) == 0:
yield self.close()
return
revs = self._sortgroup(revlog, nodelist, lookup)
# add the parent of the first rev
p = revlog.parentrevs(revs[0])[0]
revs.insert(0, p)
# build deltas
total = len(revs) - 1
msgbundling = _('bundling')
for r in xrange(len(revs) - 1):
if units is not None:
self._progress(msgbundling, r + 1, unit=units, total=total)
prev, curr = revs[r], revs[r + 1]
linknode = lookup(revlog.node(curr))
for c in self.revchunk(revlog, curr, prev, linknode):
yield c
if units is not None:
self._progress(msgbundling, None)
yield self.close()
# filter any nodes that claim to be part of the known set
def prune(self, revlog, missing, commonrevs):
rr, rl = revlog.rev, revlog.linkrev
return [n for n in missing if rl(rr(n)) not in commonrevs]
def _packmanifests(self, dir, mfnodes, lookuplinknode):
"""Pack flat manifests into a changegroup stream."""
assert not dir
for chunk in self.group(mfnodes, self._repo.manifestlog._revlog,
lookuplinknode, units=_('manifests')):
yield chunk
def _manifestsdone(self):
return ''
def generate(self, commonrevs, clnodes, fastpathlinkrev, source):
'''yield a sequence of changegroup chunks (strings)'''
repo = self._repo
cl = repo.changelog
clrevorder = {}
mfs = {} # needed manifests
fnodes = {} # needed file nodes
changedfiles = set()
# Callback for the changelog, used to collect changed files and manifest
# nodes.
# Returns the linkrev node (identity in the changelog case).
def lookupcl(x):
c = cl.read(x)
clrevorder[x] = len(clrevorder)
n = c[0]
# record the first changeset introducing this manifest version
mfs.setdefault(n, x)
# Record a complete list of potentially-changed files in
# this manifest.
changedfiles.update(c[3])
return x
self._verbosenote(_('uncompressed size of bundle content:\n'))
size = 0
for chunk in self.group(clnodes, cl, lookupcl, units=_('changesets')):
size += len(chunk)
yield chunk
self._verbosenote(_('%8.i (changelog)\n') % size)
# We need to make sure that the linkrev in the changegroup refers to
# the first changeset that introduced the manifest or file revision.
# The fastpath is usually safer than the slowpath, because the filelogs
# are walked in revlog order.
#
# When taking the slowpath with reorder=None and the manifest revlog
# uses generaldelta, the manifest may be walked in the "wrong" order.
# Without 'clrevorder', we would get an incorrect linkrev (see fix in
# cc0ff93d0c0c).
#
# When taking the fastpath, we are only vulnerable to reordering
# of the changelog itself. The changelog never uses generaldelta, so
# it is only reordered when reorder=True. To handle this case, we
# simply take the slowpath, which already has the 'clrevorder' logic.
# This was also fixed in cc0ff93d0c0c.
fastpathlinkrev = fastpathlinkrev and not self._reorder
# Treemanifests don't work correctly with fastpathlinkrev
# either, because we don't discover which directory nodes to
# send along with files. This could probably be fixed.
fastpathlinkrev = fastpathlinkrev and (
'treemanifest' not in repo.requirements)
for chunk in self.generatemanifests(commonrevs, clrevorder,
fastpathlinkrev, mfs, fnodes, source):
yield chunk
mfs.clear()
clrevs = set(cl.rev(x) for x in clnodes)
if not fastpathlinkrev:
def linknodes(unused, fname):
return fnodes.get(fname, {})
else:
cln = cl.node
def linknodes(filerevlog, fname):
llr = filerevlog.linkrev
fln = filerevlog.node
revs = ((r, llr(r)) for r in filerevlog)
return dict((fln(r), cln(lr)) for r, lr in revs if lr in clrevs)
for chunk in self.generatefiles(changedfiles, linknodes, commonrevs,
source):
yield chunk
yield self.close()
if clnodes:
repo.hook('outgoing', node=hex(clnodes[0]), source=source)
def generatemanifests(self, commonrevs, clrevorder, fastpathlinkrev, mfs,
fnodes, source):
"""Returns an iterator of changegroup chunks containing manifests.
`source` is unused here, but is used by extensions like remotefilelog to
change what is sent based in pulls vs pushes, etc.
"""
repo = self._repo
mfl = repo.manifestlog
dirlog = mfl._revlog.dirlog
tmfnodes = {'': mfs}
# Callback for the manifest, used to collect linkrevs for filelog
# revisions.
# Returns the linkrev node (collected in lookupcl).
def makelookupmflinknode(dir):
if fastpathlinkrev:
assert not dir
return mfs.__getitem__
def lookupmflinknode(x):
"""Callback for looking up the linknode for manifests.
Returns the linkrev node for the specified manifest.
SIDE EFFECT:
1) fclnodes gets populated with the list of relevant
file nodes if we're not using fastpathlinkrev
2) When treemanifests are in use, collects treemanifest nodes
to send
Note that this means manifests must be completely sent to
the client before you can trust the list of files and
treemanifests to send.
"""
clnode = tmfnodes[dir][x]
mdata = mfl.get(dir, x).readfast(shallow=True)
for p, n, fl in mdata.iterentries():
if fl == 't': # subdirectory manifest
subdir = dir + p + '/'
tmfclnodes = tmfnodes.setdefault(subdir, {})
tmfclnode = tmfclnodes.setdefault(n, clnode)
if clrevorder[clnode] < clrevorder[tmfclnode]:
tmfclnodes[n] = clnode
else:
f = dir + p
fclnodes = fnodes.setdefault(f, {})
fclnode = fclnodes.setdefault(n, clnode)
if clrevorder[clnode] < clrevorder[fclnode]:
fclnodes[n] = clnode
return clnode
return lookupmflinknode
size = 0
while tmfnodes:
dir = min(tmfnodes)
nodes = tmfnodes[dir]
prunednodes = self.prune(dirlog(dir), nodes, commonrevs)
if not dir or prunednodes:
for x in self._packmanifests(dir, prunednodes,
makelookupmflinknode(dir)):
size += len(x)
yield x
del tmfnodes[dir]
self._verbosenote(_('%8.i (manifests)\n') % size)
yield self._manifestsdone()
# The 'source' parameter is useful for extensions
def generatefiles(self, changedfiles, linknodes, commonrevs, source):
repo = self._repo
progress = self._progress
msgbundling = _('bundling')
total = len(changedfiles)
# for progress output
msgfiles = _('files')
for i, fname in enumerate(sorted(changedfiles)):
filerevlog = repo.file(fname)
if not filerevlog:
raise error.Abort(_("empty or missing revlog for %s") % fname)
linkrevnodes = linknodes(filerevlog, fname)
# Lookup for filenodes, we collected the linkrev nodes above in the
# fastpath case and with lookupmf in the slowpath case.
def lookupfilelog(x):
return linkrevnodes[x]
filenodes = self.prune(filerevlog, linkrevnodes, commonrevs)
if filenodes:
progress(msgbundling, i + 1, item=fname, unit=msgfiles,
total=total)
h = self.fileheader(fname)
size = len(h)
yield h
for chunk in self.group(filenodes, filerevlog, lookupfilelog):
size += len(chunk)
yield chunk
self._verbosenote(_('%8.i %s\n') % (size, fname))
progress(msgbundling, None)
def deltaparent(self, revlog, rev, p1, p2, prev):
return prev
def revchunk(self, revlog, rev, prev, linknode):
node = revlog.node(rev)
p1, p2 = revlog.parentrevs(rev)
base = self.deltaparent(revlog, rev, p1, p2, prev)
prefix = ''
if revlog.iscensored(base) or revlog.iscensored(rev):
try:
delta = revlog.revision(node, raw=True)
except error.CensoredNodeError as e:
delta = e.tombstone
if base == nullrev:
prefix = mdiff.trivialdiffheader(len(delta))
else:
baselen = revlog.rawsize(base)
prefix = mdiff.replacediffheader(baselen, len(delta))
elif base == nullrev:
delta = revlog.revision(node, raw=True)
prefix = mdiff.trivialdiffheader(len(delta))
else:
delta = revlog.revdiff(base, rev)
p1n, p2n = revlog.parents(node)
basenode = revlog.node(base)
flags = revlog.flags(rev)
meta = self.builddeltaheader(node, p1n, p2n, basenode, linknode, flags)
meta += prefix
l = len(meta) + len(delta)
yield chunkheader(l)
yield meta
yield delta
def builddeltaheader(self, node, p1n, p2n, basenode, linknode, flags):
# do nothing with basenode, it is implicitly the previous one in HG10
# do nothing with flags, it is implicitly 0 for cg1 and cg2
return struct.pack(self.deltaheader, node, p1n, p2n, linknode)
class cg2packer(cg1packer):
version = '02'
deltaheader = _CHANGEGROUPV2_DELTA_HEADER
def __init__(self, repo, bundlecaps=None):
super(cg2packer, self).__init__(repo, bundlecaps)
if self._reorder is None:
# Since generaldelta is directly supported by cg2, reordering
# generally doesn't help, so we disable it by default (treating
# bundle.reorder=auto just like bundle.reorder=False).
self._reorder = False
def deltaparent(self, revlog, rev, p1, p2, prev):
dp = revlog.deltaparent(rev)
if dp == nullrev and revlog.storedeltachains:
# Avoid sending full revisions when delta parent is null. Pick prev
# in that case. It's tempting to pick p1 in this case, as p1 will
# be smaller in the common case. However, computing a delta against
# p1 may require resolving the raw text of p1, which could be
# expensive. The revlog caches should have prev cached, meaning
# less CPU for changegroup generation. There is likely room to add
# a flag and/or config option to control this behavior.
return prev
elif dp == nullrev:
# revlog is configured to use full snapshot for a reason,
# stick to full snapshot.
return nullrev
elif dp not in (p1, p2, prev):
# Pick prev when we can't be sure remote has the base revision.
return prev
else:
return dp
def builddeltaheader(self, node, p1n, p2n, basenode, linknode, flags):
# Do nothing with flags, it is implicitly 0 in cg1 and cg2
return struct.pack(self.deltaheader, node, p1n, p2n, basenode, linknode)
class cg3packer(cg2packer):
version = '03'
deltaheader = _CHANGEGROUPV3_DELTA_HEADER
def _packmanifests(self, dir, mfnodes, lookuplinknode):
if dir:
yield self.fileheader(dir)
dirlog = self._repo.manifestlog._revlog.dirlog(dir)
for chunk in self.group(mfnodes, dirlog, lookuplinknode,
units=_('manifests')):
yield chunk
def _manifestsdone(self):
return self.close()
def builddeltaheader(self, node, p1n, p2n, basenode, linknode, flags):
return struct.pack(
self.deltaheader, node, p1n, p2n, basenode, linknode, flags)
_packermap = {'01': (cg1packer, cg1unpacker),
# cg2 adds support for exchanging generaldelta
'02': (cg2packer, cg2unpacker),
# cg3 adds support for exchanging revlog flags and treemanifests
'03': (cg3packer, cg3unpacker),
}
def allsupportedversions(repo):
versions = set(_packermap.keys())
if not (repo.ui.configbool('experimental', 'changegroup3') or
repo.ui.configbool('experimental', 'treemanifest') or
'treemanifest' in repo.requirements):
versions.discard('03')
return versions
# Changegroup versions that can be applied to the repo
def supportedincomingversions(repo):
return allsupportedversions(repo)
# Changegroup versions that can be created from the repo
def supportedoutgoingversions(repo):
versions = allsupportedversions(repo)
if 'treemanifest' in repo.requirements:
# Versions 01 and 02 support only flat manifests and it's just too
# expensive to convert between the flat manifest and tree manifest on
# the fly. Since tree manifests are hashed differently, all of history
# would have to be converted. Instead, we simply don't even pretend to
# support versions 01 and 02.
versions.discard('01')
versions.discard('02')
return versions
def localversion(repo):
# Finds the best version to use for bundles that are meant to be used
# locally, such as those from strip and shelve, and temporary bundles.
return max(supportedoutgoingversions(repo))
def safeversion(repo):
# Finds the smallest version that it's safe to assume clients of the repo
# will support. For example, all hg versions that support generaldelta also
# support changegroup 02.
versions = supportedoutgoingversions(repo)
if 'generaldelta' in repo.requirements:
versions.discard('01')
assert versions
return min(versions)
def getbundler(version, repo, bundlecaps=None):
assert version in supportedoutgoingversions(repo)
return _packermap[version][0](repo, bundlecaps)
def getunbundler(version, fh, alg, extras=None):
return _packermap[version][1](fh, alg, extras=extras)
def _changegroupinfo(repo, nodes, source):
if repo.ui.verbose or source == 'bundle':
repo.ui.status(_("%d changesets found\n") % len(nodes))
if repo.ui.debugflag:
repo.ui.debug("list of changesets:\n")
for node in nodes:
repo.ui.debug("%s\n" % hex(node))
def makechangegroup(repo, outgoing, version, source, fastpath=False,
bundlecaps=None):
cgstream = makestream(repo, outgoing, version, source,
fastpath=fastpath, bundlecaps=bundlecaps)
return getunbundler(version, util.chunkbuffer(cgstream), None,
{'clcount': len(outgoing.missing) })
def makestream(repo, outgoing, version, source, fastpath=False,
bundlecaps=None):
bundler = getbundler(version, repo, bundlecaps=bundlecaps)
repo = repo.unfiltered()
commonrevs = outgoing.common
csets = outgoing.missing
heads = outgoing.missingheads
# We go through the fast path if we get told to, or if all (unfiltered
# heads have been requested (since we then know there all linkrevs will
# be pulled by the client).
heads.sort()
fastpathlinkrev = fastpath or (
repo.filtername is None and heads == sorted(repo.heads()))
repo.hook('preoutgoing', throw=True, source=source)
_changegroupinfo(repo, csets, source)
return bundler.generate(commonrevs, csets, fastpathlinkrev, source)
def _addchangegroupfiles(repo, source, revmap, trp, expectedfiles, needfiles):
revisions = 0
files = 0
for chunkdata in iter(source.filelogheader, {}):
files += 1
f = chunkdata["filename"]
repo.ui.debug("adding %s revisions\n" % f)
repo.ui.progress(_('files'), files, unit=_('files'),
total=expectedfiles)
fl = repo.file(f)
o = len(fl)
try:
deltas = source.deltaiter()
if not fl.addgroup(deltas, revmap, trp):
raise error.Abort(_("received file revlog group is empty"))
except error.CensoredBaseError as e:
raise error.Abort(_("received delta base is censored: %s") % e)
revisions += len(fl) - o
if f in needfiles:
needs = needfiles[f]
for new in xrange(o, len(fl)):
n = fl.node(new)
if n in needs:
needs.remove(n)
else:
raise error.Abort(
_("received spurious file revlog entry"))
if not needs:
del needfiles[f]
repo.ui.progress(_('files'), None)
for f, needs in needfiles.iteritems():
fl = repo.file(f)
for n in needs:
try:
fl.rev(n)
except error.LookupError:
raise error.Abort(
_('missing file data for %s:%s - run hg verify') %
(f, hex(n)))
return revisions, files