|
|
# 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 i18n import _
|
|
|
from node import nullrev, hex
|
|
|
import mdiff, util, dagutil
|
|
|
import struct, os, bz2, zlib, tempfile
|
|
|
|
|
|
_BUNDLE10_DELTA_HEADER = "20s20s20s20s"
|
|
|
|
|
|
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 util.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 util.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)
|
|
|
|
|
|
class nocompress(object):
|
|
|
def compress(self, x):
|
|
|
return x
|
|
|
def flush(self):
|
|
|
return ""
|
|
|
|
|
|
bundletypes = {
|
|
|
"": ("", nocompress), # only when using unbundle on ssh and old http servers
|
|
|
# since the unification ssh accepts a header but there
|
|
|
# is no capability signaling it.
|
|
|
"HG10UN": ("HG10UN", nocompress),
|
|
|
"HG10BZ": ("HG10", lambda: bz2.BZ2Compressor()),
|
|
|
"HG10GZ": ("HG10GZ", lambda: zlib.compressobj()),
|
|
|
}
|
|
|
|
|
|
# hgweb uses this list to communicate its preferred type
|
|
|
bundlepriority = ['HG10GZ', 'HG10BZ', 'HG10UN']
|
|
|
|
|
|
def writebundle(cg, filename, bundletype):
|
|
|
"""Write a bundle file and return its filename.
|
|
|
|
|
|
Existing files will not be overwritten.
|
|
|
If no filename is specified, a temporary file is created.
|
|
|
bz2 compression can be turned off.
|
|
|
The bundle file will be deleted in case of errors.
|
|
|
"""
|
|
|
|
|
|
fh = None
|
|
|
cleanup = None
|
|
|
try:
|
|
|
if filename:
|
|
|
fh = open(filename, "wb")
|
|
|
else:
|
|
|
fd, filename = tempfile.mkstemp(prefix="hg-bundle-", suffix=".hg")
|
|
|
fh = os.fdopen(fd, "wb")
|
|
|
cleanup = filename
|
|
|
|
|
|
header, compressor = bundletypes[bundletype]
|
|
|
fh.write(header)
|
|
|
z = compressor()
|
|
|
|
|
|
# parse the changegroup data, otherwise we will block
|
|
|
# in case of sshrepo because we don't know the end of the stream
|
|
|
|
|
|
# an empty chunkgroup is the end of the changegroup
|
|
|
# a changegroup has at least 2 chunkgroups (changelog and manifest).
|
|
|
# after that, an empty chunkgroup is the end of the changegroup
|
|
|
empty = False
|
|
|
count = 0
|
|
|
while not empty or count <= 2:
|
|
|
empty = True
|
|
|
count += 1
|
|
|
while True:
|
|
|
chunk = getchunk(cg)
|
|
|
if not chunk:
|
|
|
break
|
|
|
empty = False
|
|
|
fh.write(z.compress(chunkheader(len(chunk))))
|
|
|
pos = 0
|
|
|
while pos < len(chunk):
|
|
|
next = pos + 2**20
|
|
|
fh.write(z.compress(chunk[pos:next]))
|
|
|
pos = next
|
|
|
fh.write(z.compress(closechunk()))
|
|
|
fh.write(z.flush())
|
|
|
cleanup = None
|
|
|
return filename
|
|
|
finally:
|
|
|
if fh is not None:
|
|
|
fh.close()
|
|
|
if cleanup is not None:
|
|
|
os.unlink(cleanup)
|
|
|
|
|
|
def decompressor(fh, alg):
|
|
|
if alg == 'UN':
|
|
|
return fh
|
|
|
elif alg == 'GZ':
|
|
|
def generator(f):
|
|
|
zd = zlib.decompressobj()
|
|
|
for chunk in util.filechunkiter(f):
|
|
|
yield zd.decompress(chunk)
|
|
|
elif alg == 'BZ':
|
|
|
def generator(f):
|
|
|
zd = bz2.BZ2Decompressor()
|
|
|
zd.decompress("BZ")
|
|
|
for chunk in util.filechunkiter(f, 4096):
|
|
|
yield zd.decompress(chunk)
|
|
|
else:
|
|
|
raise util.Abort("unknown bundle compression '%s'" % alg)
|
|
|
return util.chunkbuffer(generator(fh))
|
|
|
|
|
|
class unbundle10(object):
|
|
|
deltaheader = _BUNDLE10_DELTA_HEADER
|
|
|
deltaheadersize = struct.calcsize(deltaheader)
|
|
|
def __init__(self, fh, alg):
|
|
|
self._stream = decompressor(fh, alg)
|
|
|
self._type = alg
|
|
|
self.callback = None
|
|
|
def compressed(self):
|
|
|
return 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 util.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 dict(filename=fname)
|
|
|
|
|
|
def _deltaheader(self, headertuple, prevnode):
|
|
|
node, p1, p2, cs = headertuple
|
|
|
if prevnode is None:
|
|
|
deltabase = p1
|
|
|
else:
|
|
|
deltabase = prevnode
|
|
|
return node, p1, p2, deltabase, cs
|
|
|
|
|
|
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 = self._deltaheader(header, prevnode)
|
|
|
return dict(node=node, p1=p1, p2=p2, cs=cs,
|
|
|
deltabase=deltabase, delta=delta)
|
|
|
|
|
|
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)
|
|
|
|
|
|
def readbundle(fh, fname):
|
|
|
header = readexactly(fh, 6)
|
|
|
|
|
|
if not fname:
|
|
|
fname = "stream"
|
|
|
if not header.startswith('HG') and header.startswith('\0'):
|
|
|
fh = headerlessfixup(fh, header)
|
|
|
header = "HG10UN"
|
|
|
|
|
|
magic, version, alg = header[0:2], header[2:4], header[4:6]
|
|
|
|
|
|
if magic != 'HG':
|
|
|
raise util.Abort(_('%s: not a Mercurial bundle') % fname)
|
|
|
if version != '10':
|
|
|
raise util.Abort(_('%s: unknown bundle version %s') % (fname, version))
|
|
|
return unbundle10(fh, alg)
|
|
|
|
|
|
class bundle10(object):
|
|
|
deltaheader = _BUNDLE10_DELTA_HEADER
|
|
|
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.
|
|
|
"""
|
|
|
# Set of capabilities we can use to build the bundle.
|
|
|
if bundlecaps is None:
|
|
|
bundlecaps = set()
|
|
|
self._bundlecaps = bundlecaps
|
|
|
self._changelog = repo.changelog
|
|
|
self._manifest = repo.manifest
|
|
|
reorder = repo.ui.config('bundle', 'reorder', 'auto')
|
|
|
if reorder == 'auto':
|
|
|
reorder = None
|
|
|
else:
|
|
|
reorder = util.parsebool(reorder)
|
|
|
self._repo = repo
|
|
|
self._reorder = reorder
|
|
|
self._progress = repo.ui.progress
|
|
|
def close(self):
|
|
|
return closechunk()
|
|
|
|
|
|
def fileheader(self, fname):
|
|
|
return chunkheader(len(fname)) + fname
|
|
|
|
|
|
def group(self, nodelist, revlog, lookup, units=None, reorder=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
|
|
|
|
|
|
# for generaldelta revlogs, we linearize the revs; this will both be
|
|
|
# much quicker and generate a much smaller bundle
|
|
|
if (revlog._generaldelta and reorder is not False) or reorder:
|
|
|
dag = dagutil.revlogdag(revlog)
|
|
|
revs = set(revlog.rev(n) for n in nodelist)
|
|
|
revs = dag.linearize(revs)
|
|
|
else:
|
|
|
revs = sorted([revlog.rev(n) for n in nodelist])
|
|
|
|
|
|
# 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
|
|
|
|
|
|
yield self.close()
|
|
|
|
|
|
# filter any nodes that claim to be part of the known set
|
|
|
def prune(self, revlog, missing, commonrevs, source):
|
|
|
rr, rl = revlog.rev, revlog.linkrev
|
|
|
return [n for n in missing if rl(rr(n)) not in commonrevs]
|
|
|
|
|
|
def generate(self, commonrevs, clnodes, fastpathlinkrev, source):
|
|
|
'''yield a sequence of changegroup chunks (strings)'''
|
|
|
repo = self._repo
|
|
|
cl = self._changelog
|
|
|
mf = self._manifest
|
|
|
reorder = self._reorder
|
|
|
progress = self._progress
|
|
|
|
|
|
# for progress output
|
|
|
msgbundling = _('bundling')
|
|
|
|
|
|
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)
|
|
|
changedfiles.update(c[3])
|
|
|
# record the first changeset introducing this manifest version
|
|
|
mfs.setdefault(c[0], x)
|
|
|
return x
|
|
|
|
|
|
# Callback for the manifest, used to collect linkrevs for filelog
|
|
|
# revisions.
|
|
|
# Returns the linkrev node (collected in lookupcl).
|
|
|
def lookupmf(x):
|
|
|
clnode = mfs[x]
|
|
|
if not fastpathlinkrev:
|
|
|
mdata = mf.readfast(x)
|
|
|
for f, n in mdata.iteritems():
|
|
|
if f in changedfiles:
|
|
|
# record the first changeset introducing this filelog
|
|
|
# version
|
|
|
fnodes[f].setdefault(n, clnode)
|
|
|
return clnode
|
|
|
|
|
|
for chunk in self.group(clnodes, cl, lookupcl, units=_('changesets'),
|
|
|
reorder=reorder):
|
|
|
yield chunk
|
|
|
progress(msgbundling, None)
|
|
|
|
|
|
for f in changedfiles:
|
|
|
fnodes[f] = {}
|
|
|
mfnodes = self.prune(mf, mfs, commonrevs, source)
|
|
|
for chunk in self.group(mfnodes, mf, lookupmf, units=_('manifests'),
|
|
|
reorder=reorder):
|
|
|
yield chunk
|
|
|
progress(msgbundling, None)
|
|
|
|
|
|
mfs.clear()
|
|
|
|
|
|
def linknodes(filerevlog, fname):
|
|
|
if fastpathlinkrev:
|
|
|
ln, llr = filerevlog.node, filerevlog.linkrev
|
|
|
needed = set(cl.rev(x) for x in clnodes)
|
|
|
def genfilenodes():
|
|
|
for r in filerevlog:
|
|
|
linkrev = llr(r)
|
|
|
if linkrev in needed:
|
|
|
yield filerevlog.node(r), cl.node(linkrev)
|
|
|
fnodes[fname] = dict(genfilenodes())
|
|
|
return fnodes.get(fname, {})
|
|
|
|
|
|
for chunk in self.generatefiles(changedfiles, linknodes, commonrevs,
|
|
|
source):
|
|
|
yield chunk
|
|
|
|
|
|
yield self.close()
|
|
|
progress(msgbundling, None)
|
|
|
|
|
|
if clnodes:
|
|
|
repo.hook('outgoing', node=hex(clnodes[0]), source=source)
|
|
|
|
|
|
def generatefiles(self, changedfiles, linknodes, commonrevs, source):
|
|
|
repo = self._repo
|
|
|
progress = self._progress
|
|
|
reorder = self._reorder
|
|
|
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 util.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, source)
|
|
|
if filenodes:
|
|
|
progress(msgbundling, i + 1, item=fname, unit=msgfiles,
|
|
|
total=total)
|
|
|
yield self.fileheader(fname)
|
|
|
for chunk in self.group(filenodes, filerevlog, lookupfilelog,
|
|
|
reorder=reorder):
|
|
|
yield chunk
|
|
|
|
|
|
def revchunk(self, revlog, rev, prev, linknode):
|
|
|
node = revlog.node(rev)
|
|
|
p1, p2 = revlog.parentrevs(rev)
|
|
|
base = prev
|
|
|
|
|
|
prefix = ''
|
|
|
if base == nullrev:
|
|
|
delta = revlog.revision(node)
|
|
|
prefix = mdiff.trivialdiffheader(len(delta))
|
|
|
else:
|
|
|
delta = revlog.revdiff(base, rev)
|
|
|
p1n, p2n = revlog.parents(node)
|
|
|
basenode = revlog.node(base)
|
|
|
meta = self.builddeltaheader(node, p1n, p2n, basenode, linknode)
|
|
|
meta += prefix
|
|
|
l = len(meta) + len(delta)
|
|
|
yield chunkheader(l)
|
|
|
yield meta
|
|
|
yield delta
|
|
|
def builddeltaheader(self, node, p1n, p2n, basenode, linknode):
|
|
|
# do nothing with basenode, it is implicitly the previous one in HG10
|
|
|
return struct.pack(self.deltaheader, node, p1n, p2n, linknode)
|
|
|
|
