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# narrowbundle2.py - bundle2 extensions for narrow repository support
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#
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# Copyright 2017 Google, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import collections
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import errno
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import struct
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from mercurial.i18n import _
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from mercurial.node import (
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bin,
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nullid,
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nullrev,
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)
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from mercurial import (
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bundle2,
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changegroup,
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dagutil,
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error,
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exchange,
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extensions,
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narrowspec,
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repair,
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util,
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wireprototypes,
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)
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from mercurial.utils import (
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stringutil,
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)
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NARROWCAP = 'narrow'
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_NARROWACL_SECTION = 'narrowhgacl'
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_CHANGESPECPART = NARROWCAP + ':changespec'
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_SPECPART = NARROWCAP + ':spec'
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_SPECPART_INCLUDE = 'include'
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_SPECPART_EXCLUDE = 'exclude'
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_KILLNODESIGNAL = 'KILL'
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_DONESIGNAL = 'DONE'
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_ELIDEDCSHEADER = '>20s20s20sl' # cset id, p1, p2, len(text)
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_ELIDEDMFHEADER = '>20s20s20s20sl' # manifest id, p1, p2, link id, len(text)
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_CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER)
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_MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER)
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# When advertising capabilities, always include narrow clone support.
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def getrepocaps_narrow(orig, repo, **kwargs):
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caps = orig(repo, **kwargs)
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caps[NARROWCAP] = ['v0']
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return caps
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def _computeellipsis(repo, common, heads, known, match, depth=None):
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"""Compute the shape of a narrowed DAG.
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Args:
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repo: The repository we're transferring.
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common: The roots of the DAG range we're transferring.
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May be just [nullid], which means all ancestors of heads.
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heads: The heads of the DAG range we're transferring.
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match: The narrowmatcher that allows us to identify relevant changes.
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depth: If not None, only consider nodes to be full nodes if they are at
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most depth changesets away from one of heads.
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Returns:
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A tuple of (visitnodes, relevant_nodes, ellipsisroots) where:
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visitnodes: The list of nodes (either full or ellipsis) which
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need to be sent to the client.
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relevant_nodes: The set of changelog nodes which change a file inside
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the narrowspec. The client needs these as non-ellipsis nodes.
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ellipsisroots: A dict of {rev: parents} that is used in
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narrowchangegroup to produce ellipsis nodes with the
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correct parents.
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"""
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cl = repo.changelog
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mfl = repo.manifestlog
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cldag = dagutil.revlogdag(cl)
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# dagutil does not like nullid/nullrev
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commonrevs = cldag.internalizeall(common - set([nullid])) | set([nullrev])
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headsrevs = cldag.internalizeall(heads)
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if depth:
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revdepth = {h: 0 for h in headsrevs}
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ellipsisheads = collections.defaultdict(set)
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ellipsisroots = collections.defaultdict(set)
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def addroot(head, curchange):
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"""Add a root to an ellipsis head, splitting heads with 3 roots."""
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ellipsisroots[head].add(curchange)
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# Recursively split ellipsis heads with 3 roots by finding the
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# roots' youngest common descendant which is an elided merge commit.
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# That descendant takes 2 of the 3 roots as its own, and becomes a
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# root of the head.
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while len(ellipsisroots[head]) > 2:
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child, roots = splithead(head)
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splitroots(head, child, roots)
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head = child # Recurse in case we just added a 3rd root
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def splitroots(head, child, roots):
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ellipsisroots[head].difference_update(roots)
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ellipsisroots[head].add(child)
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ellipsisroots[child].update(roots)
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ellipsisroots[child].discard(child)
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def splithead(head):
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r1, r2, r3 = sorted(ellipsisroots[head])
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for nr1, nr2 in ((r2, r3), (r1, r3), (r1, r2)):
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mid = repo.revs('sort(merge() & %d::%d & %d::%d, -rev)',
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nr1, head, nr2, head)
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for j in mid:
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if j == nr2:
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return nr2, (nr1, nr2)
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if j not in ellipsisroots or len(ellipsisroots[j]) < 2:
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return j, (nr1, nr2)
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raise error.Abort('Failed to split up ellipsis node! head: %d, '
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'roots: %d %d %d' % (head, r1, r2, r3))
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missing = list(cl.findmissingrevs(common=commonrevs, heads=headsrevs))
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visit = reversed(missing)
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relevant_nodes = set()
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visitnodes = [cl.node(m) for m in missing]
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required = set(headsrevs) | known
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for rev in visit:
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clrev = cl.changelogrevision(rev)
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ps = cldag.parents(rev)
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if depth is not None:
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curdepth = revdepth[rev]
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for p in ps:
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revdepth[p] = min(curdepth + 1, revdepth.get(p, depth + 1))
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needed = False
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shallow_enough = depth is None or revdepth[rev] <= depth
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if shallow_enough:
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curmf = mfl[clrev.manifest].read()
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if ps:
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# We choose to not trust the changed files list in
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# changesets because it's not always correct. TODO: could
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# we trust it for the non-merge case?
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p1mf = mfl[cl.changelogrevision(ps[0]).manifest].read()
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needed = bool(curmf.diff(p1mf, match))
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if not needed and len(ps) > 1:
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# For merge changes, the list of changed files is not
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# helpful, since we need to emit the merge if a file
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# in the narrow spec has changed on either side of the
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# merge. As a result, we do a manifest diff to check.
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p2mf = mfl[cl.changelogrevision(ps[1]).manifest].read()
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needed = bool(curmf.diff(p2mf, match))
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else:
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# For a root node, we need to include the node if any
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# files in the node match the narrowspec.
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needed = any(curmf.walk(match))
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if needed:
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for head in ellipsisheads[rev]:
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addroot(head, rev)
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for p in ps:
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required.add(p)
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relevant_nodes.add(cl.node(rev))
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else:
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if not ps:
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ps = [nullrev]
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if rev in required:
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for head in ellipsisheads[rev]:
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addroot(head, rev)
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for p in ps:
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ellipsisheads[p].add(rev)
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else:
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for p in ps:
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ellipsisheads[p] |= ellipsisheads[rev]
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# add common changesets as roots of their reachable ellipsis heads
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for c in commonrevs:
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for head in ellipsisheads[c]:
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addroot(head, c)
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return visitnodes, relevant_nodes, ellipsisroots
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def _packellipsischangegroup(repo, common, match, relevant_nodes,
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ellipsisroots, visitnodes, depth, source, version):
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if version in ('01', '02'):
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raise error.Abort(
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'ellipsis nodes require at least cg3 on client and server, '
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'but negotiated version %s' % version)
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# We wrap cg1packer.revchunk, using a side channel to pass
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# relevant_nodes into that area. Then if linknode isn't in the
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# set, we know we have an ellipsis node and we should defer
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# sending that node's data. We override close() to detect
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# pending ellipsis nodes and flush them.
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packer = changegroup.getbundler(version, repo)
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# Let the packer have access to the narrow matcher so it can
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# omit filelogs and dirlogs as needed
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packer._narrow_matcher = lambda : match
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# Give the packer the list of nodes which should not be
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# ellipsis nodes. We store this rather than the set of nodes
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# that should be an ellipsis because for very large histories
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# we expect this to be significantly smaller.
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packer.full_nodes = relevant_nodes
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# Maps ellipsis revs to their roots at the changelog level.
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packer.precomputed_ellipsis = ellipsisroots
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# Maps CL revs to per-revlog revisions. Cleared in close() at
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# the end of each group.
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packer.clrev_to_localrev = {}
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packer.next_clrev_to_localrev = {}
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# Maps changelog nodes to changelog revs. Filled in once
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# during changelog stage and then left unmodified.
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packer.clnode_to_rev = {}
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packer.changelog_done = False
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# If true, informs the packer that it is serving shallow content and might
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# need to pack file contents not introduced by the changes being packed.
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packer.is_shallow = depth is not None
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return packer.generate(common, visitnodes, False, source)
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# Serve a changegroup for a client with a narrow clone.
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def getbundlechangegrouppart_narrow(bundler, repo, source,
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bundlecaps=None, b2caps=None, heads=None,
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common=None, **kwargs):
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cgversions = b2caps.get('changegroup')
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if cgversions: # 3.1 and 3.2 ship with an empty value
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cgversions = [v for v in cgversions
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if v in changegroup.supportedoutgoingversions(repo)]
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if not cgversions:
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raise ValueError(_('no common changegroup version'))
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version = max(cgversions)
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else:
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raise ValueError(_("server does not advertise changegroup version,"
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" can't negotiate support for ellipsis nodes"))
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include = sorted(filter(bool, kwargs.get(r'includepats', [])))
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exclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
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newmatch = narrowspec.match(repo.root, include=include, exclude=exclude)
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if not repo.ui.configbool("experimental", "narrowservebrokenellipses"):
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outgoing = exchange._computeoutgoing(repo, heads, common)
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if not outgoing.missing:
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return
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def wrappedgetbundler(orig, *args, **kwargs):
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bundler = orig(*args, **kwargs)
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bundler._narrow_matcher = lambda : newmatch
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return bundler
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with extensions.wrappedfunction(changegroup, 'getbundler',
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wrappedgetbundler):
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cg = changegroup.makestream(repo, outgoing, version, source)
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part = bundler.newpart('changegroup', data=cg)
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part.addparam('version', version)
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if 'treemanifest' in repo.requirements:
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part.addparam('treemanifest', '1')
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if include or exclude:
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narrowspecpart = bundler.newpart(_SPECPART)
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if include:
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narrowspecpart.addparam(
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_SPECPART_INCLUDE, '\n'.join(include), mandatory=True)
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if exclude:
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narrowspecpart.addparam(
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_SPECPART_EXCLUDE, '\n'.join(exclude), mandatory=True)
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return
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depth = kwargs.get(r'depth', None)
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if depth is not None:
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depth = int(depth)
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if depth < 1:
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raise error.Abort(_('depth must be positive, got %d') % depth)
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heads = set(heads or repo.heads())
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common = set(common or [nullid])
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oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
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oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
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known = {bin(n) for n in kwargs.get(r'known', [])}
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if known and (oldinclude != include or oldexclude != exclude):
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# Steps:
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# 1. Send kill for "$known & ::common"
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#
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# 2. Send changegroup for ::common
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#
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# 3. Proceed.
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#
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# In the future, we can send kills for only the specific
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# nodes we know should go away or change shape, and then
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# send a data stream that tells the client something like this:
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#
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# a) apply this changegroup
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# b) apply nodes XXX, YYY, ZZZ that you already have
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# c) goto a
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#
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# until they've built up the full new state.
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# Convert to revnums and intersect with "common". The client should
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# have made it a subset of "common" already, but let's be safe.
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known = set(repo.revs("%ln & ::%ln", known, common))
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# TODO: we could send only roots() of this set, and the
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# list of nodes in common, and the client could work out
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# what to strip, instead of us explicitly sending every
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# single node.
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deadrevs = known
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def genkills():
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for r in deadrevs:
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yield _KILLNODESIGNAL
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yield repo.changelog.node(r)
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yield _DONESIGNAL
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bundler.newpart(_CHANGESPECPART, data=genkills())
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newvisit, newfull, newellipsis = _computeellipsis(
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repo, set(), common, known, newmatch)
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if newvisit:
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cg = _packellipsischangegroup(
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repo, common, newmatch, newfull, newellipsis,
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newvisit, depth, source, version)
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part = bundler.newpart('changegroup', data=cg)
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part.addparam('version', version)
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if 'treemanifest' in repo.requirements:
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part.addparam('treemanifest', '1')
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visitnodes, relevant_nodes, ellipsisroots = _computeellipsis(
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repo, common, heads, set(), newmatch, depth=depth)
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repo.ui.debug('Found %d relevant revs\n' % len(relevant_nodes))
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if visitnodes:
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cg = _packellipsischangegroup(
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repo, common, newmatch, relevant_nodes, ellipsisroots,
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visitnodes, depth, source, version)
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part = bundler.newpart('changegroup', data=cg)
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part.addparam('version', version)
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if 'treemanifest' in repo.requirements:
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part.addparam('treemanifest', '1')
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def applyacl_narrow(repo, kwargs):
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ui = repo.ui
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username = ui.shortuser(ui.environ.get('REMOTE_USER') or ui.username())
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user_includes = ui.configlist(
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_NARROWACL_SECTION, username + '.includes',
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ui.configlist(_NARROWACL_SECTION, 'default.includes'))
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user_excludes = ui.configlist(
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_NARROWACL_SECTION, username + '.excludes',
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ui.configlist(_NARROWACL_SECTION, 'default.excludes'))
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if not user_includes:
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raise error.Abort(_("{} configuration for user {} is empty")
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.format(_NARROWACL_SECTION, username))
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user_includes = [
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'path:.' if p == '*' else 'path:' + p for p in user_includes]
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user_excludes = [
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'path:.' if p == '*' else 'path:' + p for p in user_excludes]
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req_includes = set(kwargs.get(r'includepats', []))
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req_excludes = set(kwargs.get(r'excludepats', []))
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req_includes, req_excludes, invalid_includes = narrowspec.restrictpatterns(
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req_includes, req_excludes, user_includes, user_excludes)
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if invalid_includes:
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raise error.Abort(
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_("The following includes are not accessible for {}: {}")
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.format(username, invalid_includes))
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new_args = {}
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new_args.update(kwargs)
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new_args['includepats'] = req_includes
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if req_excludes:
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new_args['excludepats'] = req_excludes
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return new_args
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@bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE))
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def _handlechangespec_2(op, inpart):
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includepats = set(inpart.params.get(_SPECPART_INCLUDE, '').splitlines())
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excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, '').splitlines())
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if not changegroup.NARROW_REQUIREMENT in op.repo.requirements:
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op.repo.requirements.add(changegroup.NARROW_REQUIREMENT)
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op.repo._writerequirements()
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op.repo.setnarrowpats(includepats, excludepats)
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@bundle2.parthandler(_CHANGESPECPART)
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def _handlechangespec(op, inpart):
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repo = op.repo
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cl = repo.changelog
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# changesets which need to be stripped entirely. either they're no longer
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# needed in the new narrow spec, or the server is sending a replacement
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# in the changegroup part.
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clkills = set()
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# A changespec part contains all the updates to ellipsis nodes
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# that will happen as a result of widening or narrowing a
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# repo. All the changes that this block encounters are ellipsis
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# nodes or flags to kill an existing ellipsis.
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chunksignal = changegroup.readexactly(inpart, 4)
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while chunksignal != _DONESIGNAL:
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if chunksignal == _KILLNODESIGNAL:
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# a node used to be an ellipsis but isn't anymore
|
|
|
ck = changegroup.readexactly(inpart, 20)
|
|
|
if cl.hasnode(ck):
|
|
|
clkills.add(ck)
|
|
|
else:
|
|
|
raise error.Abort(
|
|
|
_('unexpected changespec node chunk type: %s') % chunksignal)
|
|
|
chunksignal = changegroup.readexactly(inpart, 4)
|
|
|
|
|
|
if clkills:
|
|
|
# preserve bookmarks that repair.strip() would otherwise strip
|
|
|
bmstore = repo._bookmarks
|
|
|
class dummybmstore(dict):
|
|
|
def applychanges(self, repo, tr, changes):
|
|
|
pass
|
|
|
def recordchange(self, tr): # legacy version
|
|
|
pass
|
|
|
repo._bookmarks = dummybmstore()
|
|
|
chgrpfile = repair.strip(op.ui, repo, list(clkills), backup=True,
|
|
|
topic='widen')
|
|
|
repo._bookmarks = bmstore
|
|
|
if chgrpfile:
|
|
|
# presence of _widen_bundle attribute activates widen handler later
|
|
|
op._widen_bundle = chgrpfile
|
|
|
# Set the new narrowspec if we're widening. The setnewnarrowpats() method
|
|
|
# will currently always be there when using the core+narrowhg server, but
|
|
|
# other servers may include a changespec part even when not widening (e.g.
|
|
|
# because we're deepening a shallow repo).
|
|
|
if util.safehasattr(repo, 'setnewnarrowpats'):
|
|
|
repo.setnewnarrowpats()
|
|
|
|
|
|
def handlechangegroup_widen(op, inpart):
|
|
|
"""Changegroup exchange handler which restores temporarily-stripped nodes"""
|
|
|
# We saved a bundle with stripped node data we must now restore.
|
|
|
# This approach is based on mercurial/repair.py@6ee26a53c111.
|
|
|
repo = op.repo
|
|
|
ui = op.ui
|
|
|
|
|
|
chgrpfile = op._widen_bundle
|
|
|
del op._widen_bundle
|
|
|
vfs = repo.vfs
|
|
|
|
|
|
ui.note(_("adding branch\n"))
|
|
|
f = vfs.open(chgrpfile, "rb")
|
|
|
try:
|
|
|
gen = exchange.readbundle(ui, f, chgrpfile, vfs)
|
|
|
if not ui.verbose:
|
|
|
# silence internal shuffling chatter
|
|
|
ui.pushbuffer()
|
|
|
if isinstance(gen, bundle2.unbundle20):
|
|
|
with repo.transaction('strip') as tr:
|
|
|
bundle2.processbundle(repo, gen, lambda: tr)
|
|
|
else:
|
|
|
gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True)
|
|
|
if not ui.verbose:
|
|
|
ui.popbuffer()
|
|
|
finally:
|
|
|
f.close()
|
|
|
|
|
|
# remove undo files
|
|
|
for undovfs, undofile in repo.undofiles():
|
|
|
try:
|
|
|
undovfs.unlink(undofile)
|
|
|
except OSError as e:
|
|
|
if e.errno != errno.ENOENT:
|
|
|
ui.warn(_('error removing %s: %s\n') %
|
|
|
(undovfs.join(undofile), stringutil.forcebytestr(e)))
|
|
|
|
|
|
# Remove partial backup only if there were no exceptions
|
|
|
vfs.unlink(chgrpfile)
|
|
|
|
|
|
def setup():
|
|
|
"""Enable narrow repo support in bundle2-related extension points."""
|
|
|
extensions.wrapfunction(bundle2, 'getrepocaps', getrepocaps_narrow)
|
|
|
|
|
|
getbundleargs = wireprototypes.GETBUNDLE_ARGUMENTS
|
|
|
|
|
|
getbundleargs['narrow'] = 'boolean'
|
|
|
getbundleargs['depth'] = 'plain'
|
|
|
getbundleargs['oldincludepats'] = 'csv'
|
|
|
getbundleargs['oldexcludepats'] = 'csv'
|
|
|
getbundleargs['includepats'] = 'csv'
|
|
|
getbundleargs['excludepats'] = 'csv'
|
|
|
getbundleargs['known'] = 'csv'
|
|
|
|
|
|
# Extend changegroup serving to handle requests from narrow clients.
|
|
|
origcgfn = exchange.getbundle2partsmapping['changegroup']
|
|
|
def wrappedcgfn(*args, **kwargs):
|
|
|
repo = args[1]
|
|
|
if repo.ui.has_section(_NARROWACL_SECTION):
|
|
|
getbundlechangegrouppart_narrow(
|
|
|
*args, **applyacl_narrow(repo, kwargs))
|
|
|
elif kwargs.get(r'narrow', False):
|
|
|
getbundlechangegrouppart_narrow(*args, **kwargs)
|
|
|
else:
|
|
|
origcgfn(*args, **kwargs)
|
|
|
exchange.getbundle2partsmapping['changegroup'] = wrappedcgfn
|
|
|
|
|
|
# disable rev branch cache exchange when serving a narrow bundle
|
|
|
# (currently incompatible with that part)
|
|
|
origrbcfn = exchange.getbundle2partsmapping['cache:rev-branch-cache']
|
|
|
def wrappedcgfn(*args, **kwargs):
|
|
|
repo = args[1]
|
|
|
if repo.ui.has_section(_NARROWACL_SECTION):
|
|
|
return
|
|
|
elif kwargs.get(r'narrow', False):
|
|
|
return
|
|
|
else:
|
|
|
origrbcfn(*args, **kwargs)
|
|
|
exchange.getbundle2partsmapping['cache:rev-branch-cache'] = wrappedcgfn
|
|
|
|
|
|
# Extend changegroup receiver so client can fixup after widen requests.
|
|
|
origcghandler = bundle2.parthandlermapping['changegroup']
|
|
|
def wrappedcghandler(op, inpart):
|
|
|
origcghandler(op, inpart)
|
|
|
if util.safehasattr(op, '_widen_bundle'):
|
|
|
handlechangegroup_widen(op, inpart)
|
|
|
wrappedcghandler.params = origcghandler.params
|
|
|
bundle2.parthandlermapping['changegroup'] = wrappedcghandler
|
|
|
|
