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""" Mercurial phases support code
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---
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Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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Logilab SA <contact@logilab.fr>
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Augie Fackler <durin42@gmail.com>
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This software may be used and distributed according to the terms
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of the GNU General Public License version 2 or any later version.
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---
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This module implements most phase logic in mercurial.
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Basic Concept
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=============
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A 'changeset phase' is an indicator that tells us how a changeset is
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manipulated and communicated. The details of each phase is described
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below, here we describe the properties they have in common.
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Like bookmarks, phases are not stored in history and thus are not
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permanent and leave no audit trail.
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First, no changeset can be in two phases at once. Phases are ordered,
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so they can be considered from lowest to highest. The default, lowest
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phase is 'public' - this is the normal phase of existing changesets. A
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child changeset can not be in a lower phase than its parents.
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These phases share a hierarchy of traits:
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immutable shared
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public: X X
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draft: X
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secret:
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Local commits are draft by default.
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Phase Movement and Exchange
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===========================
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Phase data is exchanged by pushkey on pull and push. Some servers have
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a publish option set, we call such a server a "publishing server".
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Pushing a draft changeset to a publishing server changes the phase to
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public.
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A small list of fact/rules define the exchange of phase:
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* old client never changes server states
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* pull never changes server states
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* publish and old server changesets are seen as public by client
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* any secret changeset seen in another repository is lowered to at
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least draft
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Here is the final table summing up the 49 possible use cases of phase
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exchange:
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server
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old publish non-publish
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N X N D P N D P
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old client
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pull
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N - X/X - X/D X/P - X/D X/P
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X - X/X - X/D X/P - X/D X/P
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push
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X X/X X/X X/P X/P X/P X/D X/D X/P
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new client
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pull
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N - P/X - P/D P/P - D/D P/P
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D - P/X - P/D P/P - D/D P/P
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P - P/X - P/D P/P - P/D P/P
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push
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D P/X P/X P/P P/P P/P D/D D/D P/P
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P P/X P/X P/P P/P P/P P/P P/P P/P
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Legend:
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A/B = final state on client / state on server
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* N = new/not present,
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* P = public,
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* D = draft,
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* X = not tracked (i.e., the old client or server has no internal
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way of recording the phase.)
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passive = only pushes
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A cell here can be read like this:
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"When a new client pushes a draft changeset (D) to a publishing
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server where it's not present (N), it's marked public on both
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sides (P/P)."
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Note: old client behave as a publishing server with draft only content
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- other people see it as public
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- content is pushed as draft
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"""
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from __future__ import absolute_import
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import errno
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import struct
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from .i18n import _
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from .node import (
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bin,
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hex,
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nullid,
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nullrev,
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short,
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)
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from . import (
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error,
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smartset,
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txnutil,
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util,
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)
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_fphasesentry = struct.Struct('>i20s')
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allphases = public, draft, secret = range(3)
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trackedphases = allphases[1:]
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phasenames = ['public', 'draft', 'secret']
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def _readroots(repo, phasedefaults=None):
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"""Read phase roots from disk
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phasedefaults is a list of fn(repo, roots) callable, which are
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executed if the phase roots file does not exist. When phases are
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being initialized on an existing repository, this could be used to
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set selected changesets phase to something else than public.
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Return (roots, dirty) where dirty is true if roots differ from
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what is being stored.
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"""
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repo = repo.unfiltered()
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dirty = False
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roots = [set() for i in allphases]
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try:
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f, pending = txnutil.trypending(repo.root, repo.svfs, 'phaseroots')
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try:
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for line in f:
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phase, nh = line.split()
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roots[int(phase)].add(bin(nh))
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finally:
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f.close()
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except IOError as inst:
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if inst.errno != errno.ENOENT:
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raise
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if phasedefaults:
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for f in phasedefaults:
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roots = f(repo, roots)
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dirty = True
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return roots, dirty
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def binaryencode(phasemapping):
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"""encode a 'phase -> nodes' mapping into a binary stream
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Since phases are integer the mapping is actually a python list:
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[[PUBLIC_HEADS], [DRAFTS_HEADS], [SECRET_HEADS]]
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"""
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binarydata = []
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for phase, nodes in enumerate(phasemapping):
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for head in nodes:
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binarydata.append(_fphasesentry.pack(phase, head))
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return ''.join(binarydata)
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def binarydecode(stream):
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"""decode a binary stream into a 'phase -> nodes' mapping
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Since phases are integer the mapping is actually a python list."""
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headsbyphase = [[] for i in allphases]
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entrysize = _fphasesentry.size
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while True:
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entry = stream.read(entrysize)
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if len(entry) < entrysize:
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if entry:
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raise error.Abort(_('bad phase-heads stream'))
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break
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phase, node = _fphasesentry.unpack(entry)
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headsbyphase[phase].append(node)
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return headsbyphase
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def _trackphasechange(data, rev, old, new):
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"""add a phase move the <data> dictionnary
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If data is None, nothing happens.
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"""
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if data is None:
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return
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existing = data.get(rev)
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if existing is not None:
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old = existing[0]
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data[rev] = (old, new)
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class phasecache(object):
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def __init__(self, repo, phasedefaults, _load=True):
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if _load:
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# Cheap trick to allow shallow-copy without copy module
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self.phaseroots, self.dirty = _readroots(repo, phasedefaults)
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self._phaserevs = None
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self._phasesets = None
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self.filterunknown(repo)
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self.opener = repo.svfs
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def getrevset(self, repo, phases):
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"""return a smartset for the given phases"""
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self.loadphaserevs(repo) # ensure phase's sets are loaded
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if self._phasesets and all(self._phasesets[p] is not None
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for p in phases):
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# fast path - use _phasesets
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revs = self._phasesets[phases[0]]
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if len(phases) > 1:
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revs = revs.copy() # only copy when needed
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for p in phases[1:]:
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revs.update(self._phasesets[p])
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if repo.changelog.filteredrevs:
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revs = revs - repo.changelog.filteredrevs
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return smartset.baseset(revs)
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else:
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# slow path - enumerate all revisions
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phase = self.phase
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revs = (r for r in repo if phase(repo, r) in phases)
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return smartset.generatorset(revs, iterasc=True)
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def copy(self):
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# Shallow copy meant to ensure isolation in
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# advance/retractboundary(), nothing more.
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ph = self.__class__(None, None, _load=False)
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ph.phaseroots = self.phaseroots[:]
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ph.dirty = self.dirty
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ph.opener = self.opener
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ph._phaserevs = self._phaserevs
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ph._phasesets = self._phasesets
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return ph
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def replace(self, phcache):
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"""replace all values in 'self' with content of phcache"""
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for a in ('phaseroots', 'dirty', 'opener', '_phaserevs', '_phasesets'):
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setattr(self, a, getattr(phcache, a))
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def _getphaserevsnative(self, repo):
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repo = repo.unfiltered()
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nativeroots = []
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for phase in trackedphases:
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nativeroots.append(map(repo.changelog.rev, self.phaseroots[phase]))
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return repo.changelog.computephases(nativeroots)
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def _computephaserevspure(self, repo):
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repo = repo.unfiltered()
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revs = [public] * len(repo.changelog)
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self._phaserevs = revs
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self._populatephaseroots(repo)
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for phase in trackedphases:
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roots = list(map(repo.changelog.rev, self.phaseroots[phase]))
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if roots:
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for rev in roots:
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revs[rev] = phase
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for rev in repo.changelog.descendants(roots):
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revs[rev] = phase
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def loadphaserevs(self, repo):
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"""ensure phase information is loaded in the object"""
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if self._phaserevs is None:
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try:
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res = self._getphaserevsnative(repo)
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self._phaserevs, self._phasesets = res
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except AttributeError:
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self._computephaserevspure(repo)
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def invalidate(self):
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self._phaserevs = None
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self._phasesets = None
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def _populatephaseroots(self, repo):
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"""Fills the _phaserevs cache with phases for the roots.
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"""
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cl = repo.changelog
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phaserevs = self._phaserevs
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for phase in trackedphases:
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roots = map(cl.rev, self.phaseroots[phase])
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for root in roots:
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phaserevs[root] = phase
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def phase(self, repo, rev):
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# We need a repo argument here to be able to build _phaserevs
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# if necessary. The repository instance is not stored in
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# phasecache to avoid reference cycles. The changelog instance
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# is not stored because it is a filecache() property and can
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# be replaced without us being notified.
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if rev == nullrev:
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return public
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if rev < nullrev:
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raise ValueError(_('cannot lookup negative revision'))
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if self._phaserevs is None or rev >= len(self._phaserevs):
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self.invalidate()
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self.loadphaserevs(repo)
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return self._phaserevs[rev]
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def write(self):
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if not self.dirty:
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return
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f = self.opener('phaseroots', 'w', atomictemp=True, checkambig=True)
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try:
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self._write(f)
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finally:
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f.close()
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def _write(self, fp):
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for phase, roots in enumerate(self.phaseroots):
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for h in roots:
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fp.write('%i %s\n' % (phase, hex(h)))
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self.dirty = False
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def _updateroots(self, phase, newroots, tr):
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self.phaseroots[phase] = newroots
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self.invalidate()
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self.dirty = True
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tr.addfilegenerator('phase', ('phaseroots',), self._write)
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tr.hookargs['phases_moved'] = '1'
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def registernew(self, repo, tr, targetphase, nodes):
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repo = repo.unfiltered()
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self._retractboundary(repo, tr, targetphase, nodes)
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if tr is not None and 'phases' in tr.changes:
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phasetracking = tr.changes['phases']
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torev = repo.changelog.rev
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phase = self.phase
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for n in nodes:
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rev = torev(n)
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revphase = phase(repo, rev)
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_trackphasechange(phasetracking, rev, None, revphase)
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repo.invalidatevolatilesets()
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def advanceboundary(self, repo, tr, targetphase, nodes):
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"""Set all 'nodes' to phase 'targetphase'
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Nodes with a phase lower than 'targetphase' are not affected.
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"""
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# Be careful to preserve shallow-copied values: do not update
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# phaseroots values, replace them.
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if tr is None:
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phasetracking = None
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else:
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phasetracking = tr.changes.get('phases')
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repo = repo.unfiltered()
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delroots = [] # set of root deleted by this path
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for phase in xrange(targetphase + 1, len(allphases)):
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# filter nodes that are not in a compatible phase already
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nodes = [n for n in nodes
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if self.phase(repo, repo[n].rev()) >= phase]
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if not nodes:
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break # no roots to move anymore
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olds = self.phaseroots[phase]
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affected = repo.revs('%ln::%ln', olds, nodes)
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for r in affected:
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_trackphasechange(phasetracking, r, self.phase(repo, r),
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targetphase)
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roots = set(ctx.node() for ctx in repo.set(
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'roots((%ln::) - %ld)', olds, affected))
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if olds != roots:
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self._updateroots(phase, roots, tr)
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# some roots may need to be declared for lower phases
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delroots.extend(olds - roots)
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# declare deleted root in the target phase
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if targetphase != 0:
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self._retractboundary(repo, tr, targetphase, delroots)
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repo.invalidatevolatilesets()
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def retractboundary(self, repo, tr, targetphase, nodes):
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oldroots = self.phaseroots[:targetphase + 1]
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if tr is None:
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phasetracking = None
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else:
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phasetracking = tr.changes.get('phases')
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repo = repo.unfiltered()
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if (self._retractboundary(repo, tr, targetphase, nodes)
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and phasetracking is not None):
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# find the affected revisions
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new = self.phaseroots[targetphase]
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old = oldroots[targetphase]
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affected = set(repo.revs('(%ln::) - (%ln::)', new, old))
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# find the phase of the affected revision
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for phase in xrange(targetphase, -1, -1):
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if phase:
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roots = oldroots[phase]
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revs = set(repo.revs('%ln::%ld', roots, affected))
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affected -= revs
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else: # public phase
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revs = affected
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for r in revs:
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_trackphasechange(phasetracking, r, phase, targetphase)
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repo.invalidatevolatilesets()
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def _retractboundary(self, repo, tr, targetphase, nodes):
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# Be careful to preserve shallow-copied values: do not update
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# phaseroots values, replace them.
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repo = repo.unfiltered()
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currentroots = self.phaseroots[targetphase]
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finalroots = oldroots = set(currentroots)
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newroots = [n for n in nodes
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if self.phase(repo, repo[n].rev()) < targetphase]
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if newroots:
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if nullid in newroots:
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raise error.Abort(_('cannot change null revision phase'))
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currentroots = currentroots.copy()
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currentroots.update(newroots)
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# Only compute new roots for revs above the roots that are being
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# retracted.
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minnewroot = min(repo[n].rev() for n in newroots)
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aboveroots = [n for n in currentroots
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if repo[n].rev() >= minnewroot]
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updatedroots = repo.set('roots(%ln::)', aboveroots)
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finalroots = set(n for n in currentroots if repo[n].rev() <
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minnewroot)
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finalroots.update(ctx.node() for ctx in updatedroots)
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if finalroots != oldroots:
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self._updateroots(targetphase, finalroots, tr)
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return True
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return False
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def filterunknown(self, repo):
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"""remove unknown nodes from the phase boundary
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|
Nothing is lost as unknown nodes only hold data for their descendants.
|
|
|
"""
|
|
|
filtered = False
|
|
|
nodemap = repo.changelog.nodemap # to filter unknown nodes
|
|
|
for phase, nodes in enumerate(self.phaseroots):
|
|
|
missing = sorted(node for node in nodes if node not in nodemap)
|
|
|
if missing:
|
|
|
for mnode in missing:
|
|
|
repo.ui.debug(
|
|
|
'removing unknown node %s from %i-phase boundary\n'
|
|
|
% (short(mnode), phase))
|
|
|
nodes.symmetric_difference_update(missing)
|
|
|
filtered = True
|
|
|
if filtered:
|
|
|
self.dirty = True
|
|
|
# filterunknown is called by repo.destroyed, we may have no changes in
|
|
|
# root but phaserevs contents is certainly invalid (or at least we
|
|
|
# have not proper way to check that). related to issue 3858.
|
|
|
#
|
|
|
# The other caller is __init__ that have no _phaserevs initialized
|
|
|
# anyway. If this change we should consider adding a dedicated
|
|
|
# "destroyed" function to phasecache or a proper cache key mechanism
|
|
|
# (see branchmap one)
|
|
|
self.invalidate()
|
|
|
|
|
|
def advanceboundary(repo, tr, targetphase, nodes):
|
|
|
"""Add nodes to a phase changing other nodes phases if necessary.
|
|
|
|
|
|
This function move boundary *forward* this means that all nodes
|
|
|
are set in the target phase or kept in a *lower* phase.
|
|
|
|
|
|
Simplify boundary to contains phase roots only."""
|
|
|
phcache = repo._phasecache.copy()
|
|
|
phcache.advanceboundary(repo, tr, targetphase, nodes)
|
|
|
repo._phasecache.replace(phcache)
|
|
|
|
|
|
def retractboundary(repo, tr, targetphase, nodes):
|
|
|
"""Set nodes back to a phase changing other nodes phases if
|
|
|
necessary.
|
|
|
|
|
|
This function move boundary *backward* this means that all nodes
|
|
|
are set in the target phase or kept in a *higher* phase.
|
|
|
|
|
|
Simplify boundary to contains phase roots only."""
|
|
|
phcache = repo._phasecache.copy()
|
|
|
phcache.retractboundary(repo, tr, targetphase, nodes)
|
|
|
repo._phasecache.replace(phcache)
|
|
|
|
|
|
def registernew(repo, tr, targetphase, nodes):
|
|
|
"""register a new revision and its phase
|
|
|
|
|
|
Code adding revisions to the repository should use this function to
|
|
|
set new changeset in their target phase (or higher).
|
|
|
"""
|
|
|
phcache = repo._phasecache.copy()
|
|
|
phcache.registernew(repo, tr, targetphase, nodes)
|
|
|
repo._phasecache.replace(phcache)
|
|
|
|
|
|
def listphases(repo):
|
|
|
"""List phases root for serialization over pushkey"""
|
|
|
# Use ordered dictionary so behavior is deterministic.
|
|
|
keys = util.sortdict()
|
|
|
value = '%i' % draft
|
|
|
for root in repo._phasecache.phaseroots[draft]:
|
|
|
keys[hex(root)] = value
|
|
|
|
|
|
if repo.publishing():
|
|
|
# Add an extra data to let remote know we are a publishing
|
|
|
# repo. Publishing repo can't just pretend they are old repo.
|
|
|
# When pushing to a publishing repo, the client still need to
|
|
|
# push phase boundary
|
|
|
#
|
|
|
# Push do not only push changeset. It also push phase data.
|
|
|
# New phase data may apply to common changeset which won't be
|
|
|
# push (as they are common). Here is a very simple example:
|
|
|
#
|
|
|
# 1) repo A push changeset X as draft to repo B
|
|
|
# 2) repo B make changeset X public
|
|
|
# 3) repo B push to repo A. X is not pushed but the data that
|
|
|
# X as now public should
|
|
|
#
|
|
|
# The server can't handle it on it's own as it has no idea of
|
|
|
# client phase data.
|
|
|
keys['publishing'] = 'True'
|
|
|
return keys
|
|
|
|
|
|
def pushphase(repo, nhex, oldphasestr, newphasestr):
|
|
|
"""List phases root for serialization over pushkey"""
|
|
|
repo = repo.unfiltered()
|
|
|
with repo.lock():
|
|
|
currentphase = repo[nhex].phase()
|
|
|
newphase = abs(int(newphasestr)) # let's avoid negative index surprise
|
|
|
oldphase = abs(int(oldphasestr)) # let's avoid negative index surprise
|
|
|
if currentphase == oldphase and newphase < oldphase:
|
|
|
with repo.transaction('pushkey-phase') as tr:
|
|
|
advanceboundary(repo, tr, newphase, [bin(nhex)])
|
|
|
return True
|
|
|
elif currentphase == newphase:
|
|
|
# raced, but got correct result
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
|
|
|
def subsetphaseheads(repo, subset):
|
|
|
"""Finds the phase heads for a subset of a history
|
|
|
|
|
|
Returns a list indexed by phase number where each item is a list of phase
|
|
|
head nodes.
|
|
|
"""
|
|
|
cl = repo.changelog
|
|
|
|
|
|
headsbyphase = [[] for i in allphases]
|
|
|
# No need to keep track of secret phase; any heads in the subset that
|
|
|
# are not mentioned are implicitly secret.
|
|
|
for phase in allphases[:-1]:
|
|
|
revset = "heads(%%ln & %s())" % phasenames[phase]
|
|
|
headsbyphase[phase] = [cl.node(r) for r in repo.revs(revset, subset)]
|
|
|
return headsbyphase
|
|
|
|
|
|
def updatephases(repo, trgetter, headsbyphase):
|
|
|
"""Updates the repo with the given phase heads"""
|
|
|
# Now advance phase boundaries of all but secret phase
|
|
|
#
|
|
|
# run the update (and fetch transaction) only if there are actually things
|
|
|
# to update. This avoid creating empty transaction during no-op operation.
|
|
|
|
|
|
for phase in allphases[:-1]:
|
|
|
revset = '%%ln - %s()' % phasenames[phase]
|
|
|
heads = [c.node() for c in repo.set(revset, headsbyphase[phase])]
|
|
|
if heads:
|
|
|
advanceboundary(repo, trgetter(), phase, heads)
|
|
|
|
|
|
def analyzeremotephases(repo, subset, roots):
|
|
|
"""Compute phases heads and root in a subset of node from root dict
|
|
|
|
|
|
* subset is heads of the subset
|
|
|
* roots is {<nodeid> => phase} mapping. key and value are string.
|
|
|
|
|
|
Accept unknown element input
|
|
|
"""
|
|
|
repo = repo.unfiltered()
|
|
|
# build list from dictionary
|
|
|
draftroots = []
|
|
|
nodemap = repo.changelog.nodemap # to filter unknown nodes
|
|
|
for nhex, phase in roots.iteritems():
|
|
|
if nhex == 'publishing': # ignore data related to publish option
|
|
|
continue
|
|
|
node = bin(nhex)
|
|
|
phase = int(phase)
|
|
|
if phase == public:
|
|
|
if node != nullid:
|
|
|
repo.ui.warn(_('ignoring inconsistent public root'
|
|
|
' from remote: %s\n') % nhex)
|
|
|
elif phase == draft:
|
|
|
if node in nodemap:
|
|
|
draftroots.append(node)
|
|
|
else:
|
|
|
repo.ui.warn(_('ignoring unexpected root from remote: %i %s\n')
|
|
|
% (phase, nhex))
|
|
|
# compute heads
|
|
|
publicheads = newheads(repo, subset, draftroots)
|
|
|
return publicheads, draftroots
|
|
|
|
|
|
def newheads(repo, heads, roots):
|
|
|
"""compute new head of a subset minus another
|
|
|
|
|
|
* `heads`: define the first subset
|
|
|
* `roots`: define the second we subtract from the first"""
|
|
|
repo = repo.unfiltered()
|
|
|
revset = repo.set('heads((%ln + parents(%ln)) - (%ln::%ln))',
|
|
|
heads, roots, roots, heads)
|
|
|
return [c.node() for c in revset]
|
|
|
|
|
|
|
|
|
def newcommitphase(ui):
|
|
|
"""helper to get the target phase of new commit
|
|
|
|
|
|
Handle all possible values for the phases.new-commit options.
|
|
|
|
|
|
"""
|
|
|
v = ui.config('phases', 'new-commit', draft)
|
|
|
try:
|
|
|
return phasenames.index(v)
|
|
|
except ValueError:
|
|
|
try:
|
|
|
return int(v)
|
|
|
except ValueError:
|
|
|
msg = _("phases.new-commit: not a valid phase name ('%s')")
|
|
|
raise error.ConfigError(msg % v)
|
|
|
|
|
|
def hassecret(repo):
|
|
|
"""utility function that check if a repo have any secret changeset."""
|
|
|
return bool(repo._phasecache.phaseroots[2])
|
|
|
|
