sapling/eden/scm/edenscm/mercurial/phases.py
Jun Wu c6fc753ad7 smartset: rename spansset to idset
Summary: Match the Rust `IdSet` name and be more different from `spanset`.

Reviewed By: kulshrax

Differential Revision: D22519590

fbshipit-source-id: 5be7990c2157dc09a37067ea7402a49da2a3127c
2020-07-20 17:27:54 -07:00

778 lines
27 KiB
Python

# Portions Copyright (c) Facebook, Inc. and its affiliates.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2.
# Copyright Matt Mackall <mpm@selenic.com> and others
""" Mercurial phases support code
---
Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Logilab SA <contact@logilab.fr>
Augie Fackler <durin42@gmail.com>
This software may be used and distributed according to the terms
of the GNU General Public License version 2 or any later version.
---
This module implements most phase logic in mercurial.
Basic Concept
=============
A 'changeset phase' is an indicator that tells us how a changeset is
manipulated and communicated. The details of each phase is described
below, here we describe the properties they have in common.
Like bookmarks, phases are not stored in history and thus are not
permanent and leave no audit trail.
First, no changeset can be in two phases at once. Phases are ordered,
so they can be considered from lowest to highest. The default, lowest
phase is 'public' - this is the normal phase of existing changesets. A
child changeset can not be in a lower phase than its parents.
These phases share a hierarchy of traits:
immutable shared
public: X X
draft: X
secret:
Local commits are draft by default.
Phase Movement and Exchange
===========================
Phase data is exchanged by pushkey on pull and push. Some servers have
a publish option set, we call such a server a "publishing server".
Pushing a draft changeset to a publishing server changes the phase to
public.
A small list of fact/rules define the exchange of phase:
* old client never changes server states
* pull never changes server states
* publish and old server changesets are seen as public by client
* any secret changeset seen in another repository is lowered to at
least draft
Here is the final table summing up the 49 possible use cases of phase
exchange:
server
old publish non-publish
N X N D P N D P
old client
pull
N - X/X - X/D X/P - X/D X/P
X - X/X - X/D X/P - X/D X/P
push
X X/X X/X X/P X/P X/P X/D X/D X/P
new client
pull
N - P/X - P/D P/P - D/D P/P
D - P/X - P/D P/P - D/D P/P
P - P/X - P/D P/P - P/D P/P
push
D P/X P/X P/P P/P P/P D/D D/D P/P
P P/X P/X P/P P/P P/P P/P P/P P/P
Legend:
A/B = final state on client / state on server
* N = new/not present,
* P = public,
* D = draft,
* X = not tracked (i.e., the old client or server has no internal
way of recording the phase.)
passive = only pushes
A cell here can be read like this:
"When a new client pushes a draft changeset (D) to a publishing
server where it's not present (N), it's marked public on both
sides (P/P)."
Note: old client behave as a publishing server with draft only content
- other people see it as public
- content is pushed as draft
"""
from __future__ import absolute_import
import errno
import struct
import bindings
from . import error, perftrace, pycompat, smartset, txnutil, util, visibility
from .i18n import _
from .node import bbin, bin, hex, nullid, nullrev, short
from .pycompat import encodeutf8, range
_fphasesentry = struct.Struct(">i20s")
allphases = public, draft, secret = list(range(3))
trackedphases = allphases[1:]
phasenames = ["public", "draft", "secret"]
def _readroots(repo, phasedefaults=None):
"""Read phase roots from disk
phasedefaults is a list of fn(repo, roots) callable, which are
executed if the phase roots file does not exist. When phases are
being initialized on an existing repository, this could be used to
set selected changesets phase to something else than public.
Return (roots, dirty) where dirty is true if roots differ from
what is being stored.
"""
dirty = False
roots = [set() for i in allphases]
try:
f, pending = txnutil.trysharedpending(
repo.root, repo.sharedroot, repo.svfs, "phaseroots"
)
try:
for line in f:
phase, nh = line.split()
roots[int(phase)].add(bbin(nh))
finally:
f.close()
except IOError as inst:
if inst.errno != errno.ENOENT:
raise
if phasedefaults:
for f in phasedefaults:
roots = f(repo, roots)
dirty = True
return roots, dirty
def binaryencode(phasemapping):
"""encode a 'phase -> nodes' mapping into a binary stream
Since phases are integer the mapping is actually a python list:
[[PUBLIC_HEADS], [DRAFTS_HEADS], [SECRET_HEADS]]
"""
binarydata = []
for phase, nodes in enumerate(phasemapping):
for head in nodes:
binarydata.append(_fphasesentry.pack(phase, head))
return b"".join(binarydata)
def binarydecode(stream):
"""decode a binary stream into a 'phase -> nodes' mapping
Since phases are integer the mapping is actually a python list."""
headsbyphase = [[] for i in allphases]
entrysize = _fphasesentry.size
while True:
entry = stream.read(entrysize)
if len(entry) < entrysize:
if entry:
raise error.Abort(_("bad phase-heads stream"))
break
phase, node = _fphasesentry.unpack(entry)
headsbyphase[phase].append(node)
return headsbyphase
def _trackphasechange(data, rev, old, new):
"""add a phase move the <data> dictionnary
If data is None, nothing happens.
"""
if data is None:
return
existing = data.get(rev)
if existing is not None:
old = existing[0]
data[rev] = (old, new)
class phasecache(object):
def __init__(self, repo, phasedefaults, _load=True):
self._headbased = repo and repo.ui.configbool("experimental", "narrow-heads")
if self._headbased:
self._draftrevs = None
self._publicrevs = None
if _load:
self.loadphaserevs(repo) # ensure phase's sets are loaded
else:
if _load:
# Cheap trick to allow shallow-copy without copy module
self.phaseroots, self.dirty = _readroots(repo, phasedefaults)
self._loadedrevslen = 0
self._phasesets = None
self.filterunknown(repo)
self.opener = repo.svfs
def getrevset(self, repo, phases, subset=None):
"""return a smartset for the given phases"""
self.loadphaserevs(repo) # ensure phase's sets are loaded
if self._headbased:
revs = bindings.dag.spans([])
if public in phases:
revs += self._publicrevs
if draft in phases:
revs += self._draftrevs
# XXX: 'secret' is treated as an ampty set.
revs = smartset.idset(revs)
if subset is not None:
revs = subset & revs
return revs
phases = set(phases)
if public not in phases:
# fast path: _phasesets contains the interesting sets,
# might only need a union and post-filtering.
if len(phases) == 1:
[p] = phases
revs = self._phasesets[p]
else:
revs = set.union(*[self._phasesets[p] for p in phases])
if subset is None:
return smartset.baseset(revs)
else:
return subset & smartset.baseset(revs)
else:
phases = set(allphases).difference(phases)
if not phases:
return smartset.fullreposet(repo)
if len(phases) == 1:
[p] = phases
revs = self._phasesets[p]
else:
revs = set.union(*[self._phasesets[p] for p in phases])
if subset is None:
subset = smartset.fullreposet(repo)
if not revs:
return subset
return subset.filter(lambda r: r not in revs)
def copy(self):
if self._headbased:
return self
# Shallow copy meant to ensure isolation in
# advance/retractboundary(), nothing more.
ph = self.__class__(None, None, _load=False)
ph.phaseroots = self.phaseroots[:]
ph.dirty = self.dirty
ph.opener = self.opener
ph._loadedrevslen = self._loadedrevslen
ph._phasesets = self._phasesets
return ph
def replace(self, phcache):
"""replace all values in 'self' with content of phcache"""
if self._headbased:
return
for a in ("phaseroots", "dirty", "opener", "_loadedrevslen", "_phasesets"):
setattr(self, a, getattr(phcache, a))
def _getphaserevsnative(self, repo):
assert not self._headbased
nativeroots = []
for phase in trackedphases:
nativeroots.append(list(map(repo.changelog.rev, self.phaseroots[phase])))
return repo.changelog.computephases(nativeroots)
def _computephaserevspure(self, repo):
assert not self._headbased
cl = repo.changelog
self._phasesets = [set() for phase in allphases]
roots = pycompat.maplist(cl.rev, self.phaseroots[secret])
if roots:
ps = set(cl.descendants(roots))
for root in roots:
ps.add(root)
self._phasesets[secret] = ps
roots = pycompat.maplist(cl.rev, self.phaseroots[draft])
if roots:
ps = set(cl.descendants(roots))
for root in roots:
ps.add(root)
ps.difference_update(self._phasesets[secret])
self._phasesets[draft] = ps
self._loadedrevslen = len(cl)
def loadphaserevs(self, repo):
"""ensure phase information is loaded in the object"""
if self._headbased:
if self._draftrevs is None:
cl = repo.changelog
if cl.userust("index2"):
publicheadnodes = repo.heads(includepublic=True, includedraft=False)
draftheadnodes = repo.heads(includepublic=False, includedraft=True)
draftnodes, publicnodes = cl.dag.onlyboth(
draftheadnodes, publicheadnodes
)
torevs = cl.torevs
self._publicrevs = torevs(publicnodes)
self._draftrevs = torevs(draftnodes)
else:
publicheadrevs = repo.headrevs(
includepublic=True, includedraft=False
)
draftheadrevs = repo.headrevs(
includepublic=False, includedraft=True
)
self._publicrevs, self._draftrevs = cl.index2.phasesets(
publicheadrevs, draftheadrevs
)
return
if self._phasesets is None:
try:
res = self._getphaserevsnative(repo)
self._loadedrevslen, self._phasesets = res
except AttributeError:
self._computephaserevspure(repo)
def invalidate(self):
if self._headbased:
self._draftrevs = None
self._publicrevs = None
return
self._loadedrevslen = 0
self._phasesets = None
def phase(self, repo, rev):
if self._headbased:
self.loadphaserevs(repo) # ensure phase's sets are loaded
# We need a repo argument here to be able to build _phasesets
# if necessary. The repository instance is not stored in
# phasecache to avoid reference cycles. The changelog instance
# is not stored because it is a filecache() property and can
# be replaced without us being notified.
if rev == nullrev:
return public
if rev < nullrev:
raise ValueError(_("cannot lookup negative revision"))
if self._headbased:
if rev in self._draftrevs:
return draft
if rev in self._publicrevs:
return public
else:
# 'secret' is repurposed as 'normally invisible' commits.
return secret
if rev >= self._loadedrevslen:
self.invalidate()
self.loadphaserevs(repo)
for phase in trackedphases:
if rev in self._phasesets[phase]:
return phase
return public
def write(self):
if self._headbased:
# head-based phases are tracked by visible heads, and remotenames
return
if not self.dirty:
return
f = self.opener("phaseroots", "w", atomictemp=True, checkambig=True)
try:
self._write(f)
finally:
f.close()
def _write(self, fp):
assert not self._headbased
for phase, roots in enumerate(self.phaseroots):
for h in roots:
fp.write(encodeutf8("%i %s\n" % (phase, hex(h))))
self.dirty = False
def _updateroots(self, phase, newroots, tr):
assert not self._headbased
self.phaseroots[phase] = newroots
self.invalidate()
self.dirty = True
tr.addfilegenerator("phase", ("phaseroots",), self._write)
tr.hookargs["phases_moved"] = "1"
def registernew(self, repo, tr, targetphase, nodes):
if self._headbased:
# head-based phases do not need to track phase of new commits
# explcitly. visible heads and remotenames track them implicitly.
return
self._retractboundary(repo, tr, targetphase, nodes)
if tr is not None and "phases" in tr.changes:
phasetracking = tr.changes["phases"]
torev = repo.changelog.rev
phase = self.phase
for n in nodes:
rev = torev(n)
revphase = phase(repo, rev)
_trackphasechange(phasetracking, rev, None, revphase)
repo.invalidatevolatilesets()
def advanceboundary(self, repo, tr, targetphase, nodes):
"""Set all 'nodes' to phase 'targetphase'
Nodes with a phase lower than 'targetphase' are not affected.
"""
if self._headbased:
# head-based phases do not support editing phases directly
return
# Be careful to preserve shallow-copied values: do not update
# phaseroots values, replace them.
if tr is None:
phasetracking = None
else:
phasetracking = tr.changes.get("phases")
delroots = [] # set of root deleted by this path
for phase in range(targetphase + 1, len(allphases)):
# filter nodes that are not in a compatible phase already
nodes = [n for n in nodes if self.phase(repo, repo[n].rev()) >= phase]
if not nodes:
break # no roots to move anymore
olds = self.phaseroots[phase]
affected = repo.revs("%ln::%ln", olds, nodes)
for r in affected:
_trackphasechange(phasetracking, r, self.phase(repo, r), targetphase)
roots = set(
ctx.node() for ctx in repo.set("roots((%ln::) - %ld)", olds, affected)
)
if olds != roots:
self._updateroots(phase, roots, tr)
if targetphase == public:
visibility.phaseadjust(
repo, tr, newpublic=set(repo[r].node() for r in affected)
)
# some roots may need to be declared for lower phases
delroots.extend(olds - roots)
# declare deleted root in the target phase
if targetphase != 0:
self._retractboundary(repo, tr, targetphase, delroots)
repo.invalidatevolatilesets()
def retractboundary(self, repo, tr, targetphase, nodes):
if self._headbased:
# head-based phases do not support editing phases directly
return
oldroots = self.phaseroots[: targetphase + 1]
if tr is None:
phasetracking = None
else:
phasetracking = tr.changes.get("phases")
if (
self._retractboundary(repo, tr, targetphase, nodes)
and phasetracking is not None
):
# find the affected revisions
new = self.phaseroots[targetphase]
old = oldroots[targetphase]
affected = set(repo.revs("(%ln::) - (%ln::)", new, old))
# find the phase of the affected revision
for phase in range(targetphase, -1, -1):
if phase:
roots = oldroots[phase]
revs = set(repo.revs("%ln::%ld", roots, affected))
affected -= revs
else: # public phase
revs = affected
for r in revs:
_trackphasechange(phasetracking, r, phase, targetphase)
visibility.phaseadjust(
repo, tr, newdraft=set(repo[r].node() for r in affected)
)
repo.invalidatevolatilesets()
def _retractboundary(self, repo, tr, targetphase, nodes):
assert not self._headbased
# Be careful to preserve shallow-copied values: do not update
# phaseroots values, replace them.
currentroots = self.phaseroots[targetphase]
finalroots = oldroots = set(currentroots)
newroots = [n for n in nodes if self.phase(repo, repo[n].rev()) < targetphase]
if newroots:
if nullid in newroots:
raise error.Abort(_("cannot change null revision phase"))
currentroots = currentroots.copy()
currentroots.update(newroots)
# Only compute new roots for revs above the roots that are being
# retracted.
minnewroot = min(repo[n].rev() for n in newroots)
aboveroots = [n for n in currentroots if repo[n].rev() >= minnewroot]
updatedroots = repo.set("roots(%ln::)", aboveroots)
finalroots = set(n for n in currentroots if repo[n].rev() < minnewroot)
finalroots.update(ctx.node() for ctx in updatedroots)
if finalroots != oldroots:
self._updateroots(targetphase, finalroots, tr)
return True
return False
def filterunknown(self, repo):
"""remove unknown nodes from the phase boundary
Nothing is lost as unknown nodes only hold data for their descendants.
"""
if self._headbased:
return
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 _phasesets 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 _phasesets 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()
if not repo._phasecache._headbased:
value = "%i" % draft
cl = repo.changelog
for root in repo._phasecache.phaseroots[draft]:
if repo._phasecache.phase(repo, cl.rev(root)) <= 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"""
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
@perftrace.tracefunc("Update Phases")
def updatephases(repo, trgetter, headsbyphase):
"""Updates the repo with the given phase heads"""
# Head-bases phases do not need update.
if repo._phasecache._headbased:
return
# 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
"""
# build list from dictionary
draftroots = []
nodemap = repo.changelog.nodemap # to filter unknown nodes
for nhex, phase in pycompat.iteritems(roots):
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
class remotephasessummary(object):
"""summarize phase information on the remote side
:publishing: True is the remote is publishing
:publicheads: list of remote public phase heads (nodes)
:draftheads: list of remote draft phase heads (nodes)
:draftroots: list of remote draft phase root (nodes)
"""
def __init__(self, repo, remotesubset, remoteroots):
self._allremoteroots = remoteroots
self.publishing = remoteroots.get("publishing", False)
ana = analyzeremotephases(repo, remotesubset, remoteroots)
self.publicheads, self.draftroots = ana
# Get the list of all "heads" revs draft on remote
dheads = repo.set("heads(%ln::%ln)", self.draftroots, remotesubset)
self.draftheads = [c.node() for c in dheads]
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"""
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")
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."""
if repo.ui.configbool("experimental", "narrow-heads"):
return False
return bool(repo._phasecache.phaseroots[2])
def preparehookargs(node, old, new):
if old is None:
old = ""
else:
old = phasenames[old]
return {"node": node, "oldphase": old, "phase": phasenames[new]}