|
|
# branchmap.py - logic to computes, maintain and stores branchmap for local repo
|
|
|
#
|
|
|
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
import struct
|
|
|
|
|
|
from .node import (
|
|
|
bin,
|
|
|
hex,
|
|
|
nullid,
|
|
|
nullrev,
|
|
|
)
|
|
|
from . import (
|
|
|
encoding,
|
|
|
error,
|
|
|
scmutil,
|
|
|
util,
|
|
|
)
|
|
|
|
|
|
calcsize = struct.calcsize
|
|
|
pack_into = struct.pack_into
|
|
|
unpack_from = struct.unpack_from
|
|
|
|
|
|
def _filename(repo):
|
|
|
"""name of a branchcache file for a given repo or repoview"""
|
|
|
filename = "cache/branch2"
|
|
|
if repo.filtername:
|
|
|
filename = '%s-%s' % (filename, repo.filtername)
|
|
|
return filename
|
|
|
|
|
|
def read(repo):
|
|
|
try:
|
|
|
f = repo.vfs(_filename(repo))
|
|
|
lines = f.read().split('\n')
|
|
|
f.close()
|
|
|
except (IOError, OSError):
|
|
|
return None
|
|
|
|
|
|
try:
|
|
|
cachekey = lines.pop(0).split(" ", 2)
|
|
|
last, lrev = cachekey[:2]
|
|
|
last, lrev = bin(last), int(lrev)
|
|
|
filteredhash = None
|
|
|
if len(cachekey) > 2:
|
|
|
filteredhash = bin(cachekey[2])
|
|
|
partial = branchcache(tipnode=last, tiprev=lrev,
|
|
|
filteredhash=filteredhash)
|
|
|
if not partial.validfor(repo):
|
|
|
# invalidate the cache
|
|
|
raise ValueError('tip differs')
|
|
|
cl = repo.changelog
|
|
|
for l in lines:
|
|
|
if not l:
|
|
|
continue
|
|
|
node, state, label = l.split(" ", 2)
|
|
|
if state not in 'oc':
|
|
|
raise ValueError('invalid branch state')
|
|
|
label = encoding.tolocal(label.strip())
|
|
|
node = bin(node)
|
|
|
if not cl.hasnode(node):
|
|
|
raise ValueError('node %s does not exist' % hex(node))
|
|
|
partial.setdefault(label, []).append(node)
|
|
|
if state == 'c':
|
|
|
partial._closednodes.add(node)
|
|
|
except Exception as inst:
|
|
|
if repo.ui.debugflag:
|
|
|
msg = 'invalid branchheads cache'
|
|
|
if repo.filtername is not None:
|
|
|
msg += ' (%s)' % repo.filtername
|
|
|
msg += ': %s\n'
|
|
|
repo.ui.debug(msg % inst)
|
|
|
partial = None
|
|
|
return partial
|
|
|
|
|
|
### Nearest subset relation
|
|
|
# Nearest subset of filter X is a filter Y so that:
|
|
|
# * Y is included in X,
|
|
|
# * X - Y is as small as possible.
|
|
|
# This create and ordering used for branchmap purpose.
|
|
|
# the ordering may be partial
|
|
|
subsettable = {None: 'visible',
|
|
|
'visible': 'served',
|
|
|
'served': 'immutable',
|
|
|
'immutable': 'base'}
|
|
|
|
|
|
def updatecache(repo):
|
|
|
cl = repo.changelog
|
|
|
filtername = repo.filtername
|
|
|
partial = repo._branchcaches.get(filtername)
|
|
|
|
|
|
revs = []
|
|
|
if partial is None or not partial.validfor(repo):
|
|
|
partial = read(repo)
|
|
|
if partial is None:
|
|
|
subsetname = subsettable.get(filtername)
|
|
|
if subsetname is None:
|
|
|
partial = branchcache()
|
|
|
else:
|
|
|
subset = repo.filtered(subsetname)
|
|
|
partial = subset.branchmap().copy()
|
|
|
extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
|
|
|
revs.extend(r for r in extrarevs if r <= partial.tiprev)
|
|
|
revs.extend(cl.revs(start=partial.tiprev + 1))
|
|
|
if revs:
|
|
|
partial.update(repo, revs)
|
|
|
partial.write(repo)
|
|
|
|
|
|
assert partial.validfor(repo), filtername
|
|
|
repo._branchcaches[repo.filtername] = partial
|
|
|
|
|
|
def replacecache(repo, bm):
|
|
|
"""Replace the branchmap cache for a repo with a branch mapping.
|
|
|
|
|
|
This is likely only called during clone with a branch map from a remote.
|
|
|
"""
|
|
|
rbheads = []
|
|
|
closed = []
|
|
|
for bheads in bm.itervalues():
|
|
|
rbheads.extend(bheads)
|
|
|
for h in bheads:
|
|
|
r = repo.changelog.rev(h)
|
|
|
b, c = repo.changelog.branchinfo(r)
|
|
|
if c:
|
|
|
closed.append(h)
|
|
|
|
|
|
if rbheads:
|
|
|
rtiprev = max((int(repo.changelog.rev(node))
|
|
|
for node in rbheads))
|
|
|
cache = branchcache(bm,
|
|
|
repo[rtiprev].node(),
|
|
|
rtiprev,
|
|
|
closednodes=closed)
|
|
|
|
|
|
# Try to stick it as low as possible
|
|
|
# filter above served are unlikely to be fetch from a clone
|
|
|
for candidate in ('base', 'immutable', 'served'):
|
|
|
rview = repo.filtered(candidate)
|
|
|
if cache.validfor(rview):
|
|
|
repo._branchcaches[candidate] = cache
|
|
|
cache.write(rview)
|
|
|
break
|
|
|
|
|
|
class branchcache(dict):
|
|
|
"""A dict like object that hold branches heads cache.
|
|
|
|
|
|
This cache is used to avoid costly computations to determine all the
|
|
|
branch heads of a repo.
|
|
|
|
|
|
The cache is serialized on disk in the following format:
|
|
|
|
|
|
<tip hex node> <tip rev number> [optional filtered repo hex hash]
|
|
|
<branch head hex node> <open/closed state> <branch name>
|
|
|
<branch head hex node> <open/closed state> <branch name>
|
|
|
...
|
|
|
|
|
|
The first line is used to check if the cache is still valid. If the
|
|
|
branch cache is for a filtered repo view, an optional third hash is
|
|
|
included that hashes the hashes of all filtered revisions.
|
|
|
|
|
|
The open/closed state is represented by a single letter 'o' or 'c'.
|
|
|
This field can be used to avoid changelog reads when determining if a
|
|
|
branch head closes a branch or not.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
|
|
|
filteredhash=None, closednodes=None):
|
|
|
super(branchcache, self).__init__(entries)
|
|
|
self.tipnode = tipnode
|
|
|
self.tiprev = tiprev
|
|
|
self.filteredhash = filteredhash
|
|
|
# closednodes is a set of nodes that close their branch. If the branch
|
|
|
# cache has been updated, it may contain nodes that are no longer
|
|
|
# heads.
|
|
|
if closednodes is None:
|
|
|
self._closednodes = set()
|
|
|
else:
|
|
|
self._closednodes = closednodes
|
|
|
|
|
|
def validfor(self, repo):
|
|
|
"""Is the cache content valid regarding a repo
|
|
|
|
|
|
- False when cached tipnode is unknown or if we detect a strip.
|
|
|
- True when cache is up to date or a subset of current repo."""
|
|
|
try:
|
|
|
return ((self.tipnode == repo.changelog.node(self.tiprev))
|
|
|
and (self.filteredhash == \
|
|
|
scmutil.filteredhash(repo, self.tiprev)))
|
|
|
except IndexError:
|
|
|
return False
|
|
|
|
|
|
def _branchtip(self, heads):
|
|
|
'''Return tuple with last open head in heads and false,
|
|
|
otherwise return last closed head and true.'''
|
|
|
tip = heads[-1]
|
|
|
closed = True
|
|
|
for h in reversed(heads):
|
|
|
if h not in self._closednodes:
|
|
|
tip = h
|
|
|
closed = False
|
|
|
break
|
|
|
return tip, closed
|
|
|
|
|
|
def branchtip(self, branch):
|
|
|
'''Return the tipmost open head on branch head, otherwise return the
|
|
|
tipmost closed head on branch.
|
|
|
Raise KeyError for unknown branch.'''
|
|
|
return self._branchtip(self[branch])[0]
|
|
|
|
|
|
def branchheads(self, branch, closed=False):
|
|
|
heads = self[branch]
|
|
|
if not closed:
|
|
|
heads = [h for h in heads if h not in self._closednodes]
|
|
|
return heads
|
|
|
|
|
|
def iterbranches(self):
|
|
|
for bn, heads in self.iteritems():
|
|
|
yield (bn, heads) + self._branchtip(heads)
|
|
|
|
|
|
def copy(self):
|
|
|
"""return an deep copy of the branchcache object"""
|
|
|
return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,
|
|
|
self._closednodes)
|
|
|
|
|
|
def write(self, repo):
|
|
|
try:
|
|
|
f = repo.vfs(_filename(repo), "w", atomictemp=True)
|
|
|
cachekey = [hex(self.tipnode), '%d' % self.tiprev]
|
|
|
if self.filteredhash is not None:
|
|
|
cachekey.append(hex(self.filteredhash))
|
|
|
f.write(" ".join(cachekey) + '\n')
|
|
|
nodecount = 0
|
|
|
for label, nodes in sorted(self.iteritems()):
|
|
|
for node in nodes:
|
|
|
nodecount += 1
|
|
|
if node in self._closednodes:
|
|
|
state = 'c'
|
|
|
else:
|
|
|
state = 'o'
|
|
|
f.write("%s %s %s\n" % (hex(node), state,
|
|
|
encoding.fromlocal(label)))
|
|
|
f.close()
|
|
|
repo.ui.log('branchcache',
|
|
|
'wrote %s branch cache with %d labels and %d nodes\n',
|
|
|
repo.filtername, len(self), nodecount)
|
|
|
except (IOError, OSError, error.Abort) as inst:
|
|
|
repo.ui.debug("couldn't write branch cache: %s\n" % inst)
|
|
|
# Abort may be raise by read only opener
|
|
|
pass
|
|
|
|
|
|
def update(self, repo, revgen):
|
|
|
"""Given a branchhead cache, self, that may have extra nodes or be
|
|
|
missing heads, and a generator of nodes that are strictly a superset of
|
|
|
heads missing, this function updates self to be correct.
|
|
|
"""
|
|
|
starttime = util.timer()
|
|
|
cl = repo.changelog
|
|
|
# collect new branch entries
|
|
|
newbranches = {}
|
|
|
getbranchinfo = repo.revbranchcache().branchinfo
|
|
|
for r in revgen:
|
|
|
branch, closesbranch = getbranchinfo(r)
|
|
|
newbranches.setdefault(branch, []).append(r)
|
|
|
if closesbranch:
|
|
|
self._closednodes.add(cl.node(r))
|
|
|
|
|
|
# fetch current topological heads to speed up filtering
|
|
|
topoheads = set(cl.headrevs())
|
|
|
|
|
|
# if older branchheads are reachable from new ones, they aren't
|
|
|
# really branchheads. Note checking parents is insufficient:
|
|
|
# 1 (branch a) -> 2 (branch b) -> 3 (branch a)
|
|
|
for branch, newheadrevs in newbranches.iteritems():
|
|
|
bheads = self.setdefault(branch, [])
|
|
|
bheadset = set(cl.rev(node) for node in bheads)
|
|
|
|
|
|
# This have been tested True on all internal usage of this function.
|
|
|
# run it again in case of doubt
|
|
|
# assert not (set(bheadrevs) & set(newheadrevs))
|
|
|
newheadrevs.sort()
|
|
|
bheadset.update(newheadrevs)
|
|
|
|
|
|
# This prunes out two kinds of heads - heads that are superseded by
|
|
|
# a head in newheadrevs, and newheadrevs that are not heads because
|
|
|
# an existing head is their descendant.
|
|
|
uncertain = bheadset - topoheads
|
|
|
if uncertain:
|
|
|
floorrev = min(uncertain)
|
|
|
ancestors = set(cl.ancestors(newheadrevs, floorrev))
|
|
|
bheadset -= ancestors
|
|
|
bheadrevs = sorted(bheadset)
|
|
|
self[branch] = [cl.node(rev) for rev in bheadrevs]
|
|
|
tiprev = bheadrevs[-1]
|
|
|
if tiprev > self.tiprev:
|
|
|
self.tipnode = cl.node(tiprev)
|
|
|
self.tiprev = tiprev
|
|
|
|
|
|
if not self.validfor(repo):
|
|
|
# cache key are not valid anymore
|
|
|
self.tipnode = nullid
|
|
|
self.tiprev = nullrev
|
|
|
for heads in self.values():
|
|
|
tiprev = max(cl.rev(node) for node in heads)
|
|
|
if tiprev > self.tiprev:
|
|
|
self.tipnode = cl.node(tiprev)
|
|
|
self.tiprev = tiprev
|
|
|
self.filteredhash = scmutil.filteredhash(repo, self.tiprev)
|
|
|
|
|
|
duration = util.timer() - starttime
|
|
|
repo.ui.log('branchcache', 'updated %s branch cache in %.4f seconds\n',
|
|
|
repo.filtername, duration)
|
|
|
|
|
|
# Revision branch info cache
|
|
|
|
|
|
_rbcversion = '-v1'
|
|
|
_rbcnames = 'cache/rbc-names' + _rbcversion
|
|
|
_rbcrevs = 'cache/rbc-revs' + _rbcversion
|
|
|
# [4 byte hash prefix][4 byte branch name number with sign bit indicating open]
|
|
|
_rbcrecfmt = '>4sI'
|
|
|
_rbcrecsize = calcsize(_rbcrecfmt)
|
|
|
_rbcnodelen = 4
|
|
|
_rbcbranchidxmask = 0x7fffffff
|
|
|
_rbccloseflag = 0x80000000
|
|
|
|
|
|
class revbranchcache(object):
|
|
|
"""Persistent cache, mapping from revision number to branch name and close.
|
|
|
This is a low level cache, independent of filtering.
|
|
|
|
|
|
Branch names are stored in rbc-names in internal encoding separated by 0.
|
|
|
rbc-names is append-only, and each branch name is only stored once and will
|
|
|
thus have a unique index.
|
|
|
|
|
|
The branch info for each revision is stored in rbc-revs as constant size
|
|
|
records. The whole file is read into memory, but it is only 'parsed' on
|
|
|
demand. The file is usually append-only but will be truncated if repo
|
|
|
modification is detected.
|
|
|
The record for each revision contains the first 4 bytes of the
|
|
|
corresponding node hash, and the record is only used if it still matches.
|
|
|
Even a completely trashed rbc-revs fill thus still give the right result
|
|
|
while converging towards full recovery ... assuming no incorrectly matching
|
|
|
node hashes.
|
|
|
The record also contains 4 bytes where 31 bits contains the index of the
|
|
|
branch and the last bit indicate that it is a branch close commit.
|
|
|
The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i
|
|
|
and will grow with it but be 1/8th of its size.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, repo, readonly=True):
|
|
|
assert repo.filtername is None
|
|
|
self._repo = repo
|
|
|
self._names = [] # branch names in local encoding with static index
|
|
|
self._rbcrevs = bytearray()
|
|
|
self._rbcsnameslen = 0 # length of names read at _rbcsnameslen
|
|
|
try:
|
|
|
bndata = repo.vfs.read(_rbcnames)
|
|
|
self._rbcsnameslen = len(bndata) # for verification before writing
|
|
|
if bndata:
|
|
|
self._names = [encoding.tolocal(bn)
|
|
|
for bn in bndata.split('\0')]
|
|
|
except (IOError, OSError):
|
|
|
if readonly:
|
|
|
# don't try to use cache - fall back to the slow path
|
|
|
self.branchinfo = self._branchinfo
|
|
|
|
|
|
if self._names:
|
|
|
try:
|
|
|
data = repo.vfs.read(_rbcrevs)
|
|
|
self._rbcrevs[:] = data
|
|
|
except (IOError, OSError) as inst:
|
|
|
repo.ui.debug("couldn't read revision branch cache: %s\n" %
|
|
|
inst)
|
|
|
# remember number of good records on disk
|
|
|
self._rbcrevslen = min(len(self._rbcrevs) // _rbcrecsize,
|
|
|
len(repo.changelog))
|
|
|
if self._rbcrevslen == 0:
|
|
|
self._names = []
|
|
|
self._rbcnamescount = len(self._names) # number of names read at
|
|
|
# _rbcsnameslen
|
|
|
self._namesreverse = dict((b, r) for r, b in enumerate(self._names))
|
|
|
|
|
|
def _clear(self):
|
|
|
self._rbcsnameslen = 0
|
|
|
del self._names[:]
|
|
|
self._rbcnamescount = 0
|
|
|
self._namesreverse.clear()
|
|
|
self._rbcrevslen = len(self._repo.changelog)
|
|
|
self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize)
|
|
|
|
|
|
def branchinfo(self, rev):
|
|
|
"""Return branch name and close flag for rev, using and updating
|
|
|
persistent cache."""
|
|
|
changelog = self._repo.changelog
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
|
|
|
# avoid negative index, changelog.read(nullrev) is fast without cache
|
|
|
if rev == nullrev:
|
|
|
return changelog.branchinfo(rev)
|
|
|
|
|
|
# if requested rev isn't allocated, grow and cache the rev info
|
|
|
if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
# fast path: extract data from cache, use it if node is matching
|
|
|
reponode = changelog.node(rev)[:_rbcnodelen]
|
|
|
cachenode, branchidx = unpack_from(_rbcrecfmt, self._rbcrevs, rbcrevidx)
|
|
|
close = bool(branchidx & _rbccloseflag)
|
|
|
if close:
|
|
|
branchidx &= _rbcbranchidxmask
|
|
|
if cachenode == '\0\0\0\0':
|
|
|
pass
|
|
|
elif cachenode == reponode:
|
|
|
try:
|
|
|
return self._names[branchidx], close
|
|
|
except IndexError:
|
|
|
# recover from invalid reference to unknown branch
|
|
|
self._repo.ui.debug("referenced branch names not found"
|
|
|
" - rebuilding revision branch cache from scratch\n")
|
|
|
self._clear()
|
|
|
else:
|
|
|
# rev/node map has changed, invalidate the cache from here up
|
|
|
self._repo.ui.debug("history modification detected - truncating "
|
|
|
"revision branch cache to revision %d\n" % rev)
|
|
|
truncate = rbcrevidx + _rbcrecsize
|
|
|
del self._rbcrevs[truncate:]
|
|
|
self._rbcrevslen = min(self._rbcrevslen, truncate)
|
|
|
|
|
|
# fall back to slow path and make sure it will be written to disk
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
def _branchinfo(self, rev):
|
|
|
"""Retrieve branch info from changelog and update _rbcrevs"""
|
|
|
changelog = self._repo.changelog
|
|
|
b, close = changelog.branchinfo(rev)
|
|
|
if b in self._namesreverse:
|
|
|
branchidx = self._namesreverse[b]
|
|
|
else:
|
|
|
branchidx = len(self._names)
|
|
|
self._names.append(b)
|
|
|
self._namesreverse[b] = branchidx
|
|
|
reponode = changelog.node(rev)
|
|
|
if close:
|
|
|
branchidx |= _rbccloseflag
|
|
|
self._setcachedata(rev, reponode, branchidx)
|
|
|
return b, close
|
|
|
|
|
|
def _setcachedata(self, rev, node, branchidx):
|
|
|
"""Writes the node's branch data to the in-memory cache data."""
|
|
|
if rev == nullrev:
|
|
|
return
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
|
|
|
self._rbcrevs.extend('\0' *
|
|
|
(len(self._repo.changelog) * _rbcrecsize -
|
|
|
len(self._rbcrevs)))
|
|
|
pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx)
|
|
|
self._rbcrevslen = min(self._rbcrevslen, rev)
|
|
|
|
|
|
tr = self._repo.currenttransaction()
|
|
|
if tr:
|
|
|
tr.addfinalize('write-revbranchcache', self.write)
|
|
|
|
|
|
def write(self, tr=None):
|
|
|
"""Save branch cache if it is dirty."""
|
|
|
repo = self._repo
|
|
|
wlock = None
|
|
|
step = ''
|
|
|
try:
|
|
|
if self._rbcnamescount < len(self._names):
|
|
|
step = ' names'
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
if self._rbcnamescount != 0:
|
|
|
f = repo.vfs.open(_rbcnames, 'ab')
|
|
|
if f.tell() == self._rbcsnameslen:
|
|
|
f.write('\0')
|
|
|
else:
|
|
|
f.close()
|
|
|
repo.ui.debug("%s changed - rewriting it\n" % _rbcnames)
|
|
|
self._rbcnamescount = 0
|
|
|
self._rbcrevslen = 0
|
|
|
if self._rbcnamescount == 0:
|
|
|
# before rewriting names, make sure references are removed
|
|
|
repo.vfs.unlinkpath(_rbcrevs, ignoremissing=True)
|
|
|
f = repo.vfs.open(_rbcnames, 'wb')
|
|
|
f.write('\0'.join(encoding.fromlocal(b)
|
|
|
for b in self._names[self._rbcnamescount:]))
|
|
|
self._rbcsnameslen = f.tell()
|
|
|
f.close()
|
|
|
self._rbcnamescount = len(self._names)
|
|
|
|
|
|
start = self._rbcrevslen * _rbcrecsize
|
|
|
if start != len(self._rbcrevs):
|
|
|
step = ''
|
|
|
if wlock is None:
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
revs = min(len(repo.changelog),
|
|
|
len(self._rbcrevs) // _rbcrecsize)
|
|
|
f = repo.vfs.open(_rbcrevs, 'ab')
|
|
|
if f.tell() != start:
|
|
|
repo.ui.debug("truncating %s to %d\n" % (_rbcrevs, start))
|
|
|
f.seek(start)
|
|
|
if f.tell() != start:
|
|
|
start = 0
|
|
|
f.seek(start)
|
|
|
f.truncate()
|
|
|
end = revs * _rbcrecsize
|
|
|
f.write(self._rbcrevs[start:end])
|
|
|
f.close()
|
|
|
self._rbcrevslen = revs
|
|
|
except (IOError, OSError, error.Abort, error.LockError) as inst:
|
|
|
repo.ui.debug("couldn't write revision branch cache%s: %s\n"
|
|
|
% (step, inst))
|
|
|
finally:
|
|
|
if wlock is not None:
|
|
|
wlock.release()
|
|
|
|
