# copies.py - copy detection for Mercurial # # Copyright 2008 Matt Mackall # # 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 collections import multiprocessing import os from .i18n import _ from .revlogutils.flagutil import REVIDX_SIDEDATA from . import ( error, match as matchmod, node, pathutil, pycompat, util, ) from .revlogutils import sidedata as sidedatamod from .utils import stringutil def _filter(src, dst, t): """filters out invalid copies after chaining""" # When _chain()'ing copies in 'a' (from 'src' via some other commit 'mid') # with copies in 'b' (from 'mid' to 'dst'), we can get the different cases # in the following table (not including trivial cases). For example, case 2 # is where a file existed in 'src' and remained under that name in 'mid' and # then was renamed between 'mid' and 'dst'. # # case src mid dst result # 1 x y - - # 2 x y y x->y # 3 x y x - # 4 x y z x->z # 5 - x y - # 6 x x y x->y # # _chain() takes care of chaining the copies in 'a' and 'b', but it # cannot tell the difference between cases 1 and 2, between 3 and 4, or # between 5 and 6, so it includes all cases in its result. # Cases 1, 3, and 5 are then removed by _filter(). for k, v in list(t.items()): # remove copies from files that didn't exist if v not in src: del t[k] # remove criss-crossed copies elif k in src and v in dst: del t[k] # remove copies to files that were then removed elif k not in dst: del t[k] def _chain(prefix, suffix): """chain two sets of copies 'prefix' and 'suffix'""" result = prefix.copy() for key, value in pycompat.iteritems(suffix): result[key] = prefix.get(value, value) return result def _tracefile(fctx, am, basemf): """return file context that is the ancestor of fctx present in ancestor manifest am Note: we used to try and stop after a given limit, however checking if that limit is reached turned out to be very expensive. we are better off disabling that feature.""" for f in fctx.ancestors(): path = f.path() if am.get(path, None) == f.filenode(): return path if basemf and basemf.get(path, None) == f.filenode(): return path def _dirstatecopies(repo, match=None): ds = repo.dirstate c = ds.copies().copy() for k in list(c): if ds[k] not in b'anm' or (match and not match(k)): del c[k] return c def _computeforwardmissing(a, b, match=None): """Computes which files are in b but not a. This is its own function so extensions can easily wrap this call to see what files _forwardcopies is about to process. """ ma = a.manifest() mb = b.manifest() return mb.filesnotin(ma, match=match) def usechangesetcentricalgo(repo): """Checks if we should use changeset-centric copy algorithms""" if repo.filecopiesmode == b'changeset-sidedata': return True readfrom = repo.ui.config(b'experimental', b'copies.read-from') changesetsource = (b'changeset-only', b'compatibility') return readfrom in changesetsource def _committedforwardcopies(a, b, base, match): """Like _forwardcopies(), but b.rev() cannot be None (working copy)""" # files might have to be traced back to the fctx parent of the last # one-side-only changeset, but not further back than that repo = a._repo if usechangesetcentricalgo(repo): return _changesetforwardcopies(a, b, match) debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') dbg = repo.ui.debug if debug: dbg(b'debug.copies: looking into rename from %s to %s\n' % (a, b)) am = a.manifest() basemf = None if base is None else base.manifest() # find where new files came from # we currently don't try to find where old files went, too expensive # this means we can miss a case like 'hg rm b; hg cp a b' cm = {} # Computing the forward missing is quite expensive on large manifests, since # it compares the entire manifests. We can optimize it in the common use # case of computing what copies are in a commit versus its parent (like # during a rebase or histedit). Note, we exclude merge commits from this # optimization, since the ctx.files() for a merge commit is not correct for # this comparison. forwardmissingmatch = match if b.p1() == a and b.p2().node() == node.nullid: filesmatcher = matchmod.exact(b.files()) forwardmissingmatch = matchmod.intersectmatchers(match, filesmatcher) missing = _computeforwardmissing(a, b, match=forwardmissingmatch) ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True) if debug: dbg(b'debug.copies: missing files to search: %d\n' % len(missing)) for f in sorted(missing): if debug: dbg(b'debug.copies: tracing file: %s\n' % f) fctx = b[f] fctx._ancestrycontext = ancestrycontext if debug: start = util.timer() opath = _tracefile(fctx, am, basemf) if opath: if debug: dbg(b'debug.copies: rename of: %s\n' % opath) cm[f] = opath if debug: dbg( b'debug.copies: time: %f seconds\n' % (util.timer() - start) ) return cm def _revinfogetter(repo): """return a function that return multiple data given a "i * p1: revision number of first parent * p2: revision number of first parent * p1copies: mapping of copies from p1 * p2copies: mapping of copies from p2 * removed: a list of removed files """ cl = repo.changelog parents = cl.parentrevs if repo.filecopiesmode == b'changeset-sidedata': changelogrevision = cl.changelogrevision flags = cl.flags # A small cache to avoid doing the work twice for merges # # In the vast majority of cases, if we ask information for a revision # about 1 parent, we'll later ask it for the other. So it make sense to # keep the information around when reaching the first parent of a merge # and dropping it after it was provided for the second parents. # # It exists cases were only one parent of the merge will be walked. It # happens when the "destination" the copy tracing is descendant from a # new root, not common with the "source". In that case, we will only walk # through merge parents that are descendant of changesets common # between "source" and "destination". # # With the current case implementation if such changesets have a copy # information, we'll keep them in memory until the end of # _changesetforwardcopies. We don't expect the case to be frequent # enough to matters. # # In addition, it would be possible to reach pathological case, were # many first parent are met before any second parent is reached. In # that case the cache could grow. If this even become an issue one can # safely introduce a maximum cache size. This would trade extra CPU/IO # time to save memory. merge_caches = {} def revinfo(rev): p1, p2 = parents(rev) if flags(rev) & REVIDX_SIDEDATA: e = merge_caches.pop(rev, None) if e is not None: return e c = changelogrevision(rev) p1copies = c.p1copies p2copies = c.p2copies removed = c.filesremoved if p1 != node.nullrev and p2 != node.nullrev: # XXX some case we over cache, IGNORE merge_caches[rev] = (p1, p2, p1copies, p2copies, removed) else: p1copies = {} p2copies = {} removed = [] return p1, p2, p1copies, p2copies, removed else: def revinfo(rev): p1, p2 = parents(rev) ctx = repo[rev] p1copies, p2copies = ctx._copies removed = ctx.filesremoved() return p1, p2, p1copies, p2copies, removed return revinfo def _changesetforwardcopies(a, b, match): if a.rev() in (node.nullrev, b.rev()): return {} repo = a.repo().unfiltered() children = {} revinfo = _revinfogetter(repo) cl = repo.changelog missingrevs = cl.findmissingrevs(common=[a.rev()], heads=[b.rev()]) mrset = set(missingrevs) roots = set() for r in missingrevs: for p in cl.parentrevs(r): if p == node.nullrev: continue if p not in children: children[p] = [r] else: children[p].append(r) if p not in mrset: roots.add(p) if not roots: # no common revision to track copies from return {} min_root = min(roots) from_head = set( cl.reachableroots(min_root, [b.rev()], list(roots), includepath=True) ) iterrevs = set(from_head) iterrevs &= mrset iterrevs.update(roots) iterrevs.remove(b.rev()) revs = sorted(iterrevs) return _combinechangesetcopies(revs, children, b.rev(), revinfo, match) def _combinechangesetcopies(revs, children, targetrev, revinfo, match): """combine the copies information for each item of iterrevs revs: sorted iterable of revision to visit children: a {parent: [children]} mapping. targetrev: the final copies destination revision (not in iterrevs) revinfo(rev): a function that return (p1, p2, p1copies, p2copies, removed) match: a matcher It returns the aggregated copies information for `targetrev`. """ all_copies = {} alwaysmatch = match.always() for r in revs: copies = all_copies.pop(r, None) if copies is None: # this is a root copies = {} for i, c in enumerate(children[r]): p1, p2, p1copies, p2copies, removed = revinfo(c) if r == p1: parent = 1 childcopies = p1copies else: assert r == p2 parent = 2 childcopies = p2copies if not alwaysmatch: childcopies = { dst: src for dst, src in childcopies.items() if match(dst) } newcopies = copies if childcopies: newcopies = _chain(newcopies, childcopies) # _chain makes a copies, we can avoid doing so in some # simple/linear cases. assert newcopies is not copies for f in removed: if f in newcopies: if newcopies is copies: # copy on write to avoid affecting potential other # branches. when there are no other branches, this # could be avoided. newcopies = copies.copy() del newcopies[f] othercopies = all_copies.get(c) if othercopies is None: all_copies[c] = newcopies else: # we are the second parent to work on c, we need to merge our # work with the other. # # Unlike when copies are stored in the filelog, we consider # it a copy even if the destination already existed on the # other branch. It's simply too expensive to check if the # file existed in the manifest. # # In case of conflict, parent 1 take precedence over parent 2. # This is an arbitrary choice made anew when implementing # changeset based copies. It was made without regards with # potential filelog related behavior. if parent == 1: othercopies.update(newcopies) else: newcopies.update(othercopies) all_copies[c] = newcopies return all_copies[targetrev] def _forwardcopies(a, b, base=None, match=None): """find {dst@b: src@a} copy mapping where a is an ancestor of b""" if base is None: base = a match = a.repo().narrowmatch(match) # check for working copy if b.rev() is None: cm = _committedforwardcopies(a, b.p1(), base, match) # combine copies from dirstate if necessary copies = _chain(cm, _dirstatecopies(b._repo, match)) else: copies = _committedforwardcopies(a, b, base, match) return copies def _backwardrenames(a, b, match): if a._repo.ui.config(b'experimental', b'copytrace') == b'off': return {} # Even though we're not taking copies into account, 1:n rename situations # can still exist (e.g. hg cp a b; hg mv a c). In those cases we # arbitrarily pick one of the renames. # We don't want to pass in "match" here, since that would filter # the destination by it. Since we're reversing the copies, we want # to filter the source instead. f = _forwardcopies(b, a) r = {} for k, v in sorted(pycompat.iteritems(f)): if match and not match(v): continue # remove copies if v in a: continue r[v] = k return r def pathcopies(x, y, match=None): """find {dst@y: src@x} copy mapping for directed compare""" repo = x._repo debug = repo.ui.debugflag and repo.ui.configbool(b'devel', b'debug.copies') if debug: repo.ui.debug( b'debug.copies: searching copies from %s to %s\n' % (x, y) ) if x == y or not x or not y: return {} a = y.ancestor(x) if a == x: if debug: repo.ui.debug(b'debug.copies: search mode: forward\n') if y.rev() is None and x == y.p1(): # short-circuit to avoid issues with merge states return _dirstatecopies(repo, match) copies = _forwardcopies(x, y, match=match) elif a == y: if debug: repo.ui.debug(b'debug.copies: search mode: backward\n') copies = _backwardrenames(x, y, match=match) else: if debug: repo.ui.debug(b'debug.copies: search mode: combined\n') base = None if a.rev() != node.nullrev: base = x copies = _chain( _backwardrenames(x, a, match=match), _forwardcopies(a, y, base, match=match), ) _filter(x, y, copies) return copies def mergecopies(repo, c1, c2, base): """ Finds moves and copies between context c1 and c2 that are relevant for merging. 'base' will be used as the merge base. Copytracing is used in commands like rebase, merge, unshelve, etc to merge files that were moved/ copied in one merge parent and modified in another. For example: o ---> 4 another commit | | o ---> 3 commit that modifies a.txt | / o / ---> 2 commit that moves a.txt to b.txt |/ o ---> 1 merge base If we try to rebase revision 3 on revision 4, since there is no a.txt in revision 4, and if user have copytrace disabled, we prints the following message: ```other changed which local deleted``` Returns five dicts: "copy", "movewithdir", "diverge", "renamedelete" and "dirmove". "copy" is a mapping from destination name -> source name, where source is in c1 and destination is in c2 or vice-versa. "movewithdir" is a mapping from source name -> destination name, where the file at source present in one context but not the other needs to be moved to destination by the merge process, because the other context moved the directory it is in. "diverge" is a mapping of source name -> list of destination names for divergent renames. "renamedelete" is a mapping of source name -> list of destination names for files deleted in c1 that were renamed in c2 or vice-versa. "dirmove" is a mapping of detected source dir -> destination dir renames. This is needed for handling changes to new files previously grafted into renamed directories. This function calls different copytracing algorithms based on config. """ # avoid silly behavior for update from empty dir if not c1 or not c2 or c1 == c2: return {}, {}, {}, {}, {} narrowmatch = c1.repo().narrowmatch() # avoid silly behavior for parent -> working dir if c2.node() is None and c1.node() == repo.dirstate.p1(): return _dirstatecopies(repo, narrowmatch), {}, {}, {}, {} copytracing = repo.ui.config(b'experimental', b'copytrace') if stringutil.parsebool(copytracing) is False: # stringutil.parsebool() returns None when it is unable to parse the # value, so we should rely on making sure copytracing is on such cases return {}, {}, {}, {}, {} if usechangesetcentricalgo(repo): # The heuristics don't make sense when we need changeset-centric algos return _fullcopytracing(repo, c1, c2, base) # Copy trace disabling is explicitly below the node == p1 logic above # because the logic above is required for a simple copy to be kept across a # rebase. if copytracing == b'heuristics': # Do full copytracing if only non-public revisions are involved as # that will be fast enough and will also cover the copies which could # be missed by heuristics if _isfullcopytraceable(repo, c1, base): return _fullcopytracing(repo, c1, c2, base) return _heuristicscopytracing(repo, c1, c2, base) else: return _fullcopytracing(repo, c1, c2, base) def _isfullcopytraceable(repo, c1, base): """ Checks that if base, source and destination are all no-public branches, if yes let's use the full copytrace algorithm for increased capabilities since it will be fast enough. `experimental.copytrace.sourcecommitlimit` can be used to set a limit for number of changesets from c1 to base such that if number of changesets are more than the limit, full copytracing algorithm won't be used. """ if c1.rev() is None: c1 = c1.p1() if c1.mutable() and base.mutable(): sourcecommitlimit = repo.ui.configint( b'experimental', b'copytrace.sourcecommitlimit' ) commits = len(repo.revs(b'%d::%d', base.rev(), c1.rev())) return commits < sourcecommitlimit return False def _checksinglesidecopies( src, dsts1, m1, m2, mb, c2, base, copy, renamedelete ): if src not in m2: # deleted on side 2 if src not in m1: # renamed on side 1, deleted on side 2 renamedelete[src] = dsts1 elif m2[src] != mb[src]: if not _related(c2[src], base[src]): return # modified on side 2 for dst in dsts1: if dst not in m2: # dst not added on side 2 (handle as regular # "both created" case in manifestmerge otherwise) copy[dst] = src def _fullcopytracing(repo, c1, c2, base): """ The full copytracing algorithm which finds all the new files that were added from merge base up to the top commit and for each file it checks if this file was copied from another file. This is pretty slow when a lot of changesets are involved but will track all the copies. """ m1 = c1.manifest() m2 = c2.manifest() mb = base.manifest() copies1 = pathcopies(base, c1) copies2 = pathcopies(base, c2) if not (copies1 or copies2): return {}, {}, {}, {}, {} inversecopies1 = {} inversecopies2 = {} for dst, src in copies1.items(): inversecopies1.setdefault(src, []).append(dst) for dst, src in copies2.items(): inversecopies2.setdefault(src, []).append(dst) copy = {} diverge = {} renamedelete = {} allsources = set(inversecopies1) | set(inversecopies2) for src in allsources: dsts1 = inversecopies1.get(src) dsts2 = inversecopies2.get(src) if dsts1 and dsts2: # copied/renamed on both sides if src not in m1 and src not in m2: # renamed on both sides dsts1 = set(dsts1) dsts2 = set(dsts2) # If there's some overlap in the rename destinations, we # consider it not divergent. For example, if side 1 copies 'a' # to 'b' and 'c' and deletes 'a', and side 2 copies 'a' to 'c' # and 'd' and deletes 'a'. if dsts1 & dsts2: for dst in dsts1 & dsts2: copy[dst] = src else: diverge[src] = sorted(dsts1 | dsts2) elif src in m1 and src in m2: # copied on both sides dsts1 = set(dsts1) dsts2 = set(dsts2) for dst in dsts1 & dsts2: copy[dst] = src # TODO: Handle cases where it was renamed on one side and copied # on the other side elif dsts1: # copied/renamed only on side 1 _checksinglesidecopies( src, dsts1, m1, m2, mb, c2, base, copy, renamedelete ) elif dsts2: # copied/renamed only on side 2 _checksinglesidecopies( src, dsts2, m2, m1, mb, c1, base, copy, renamedelete ) # find interesting file sets from manifests addedinm1 = m1.filesnotin(mb, repo.narrowmatch()) addedinm2 = m2.filesnotin(mb, repo.narrowmatch()) u1 = sorted(addedinm1 - addedinm2) u2 = sorted(addedinm2 - addedinm1) header = b" unmatched files in %s" if u1: repo.ui.debug(b"%s:\n %s\n" % (header % b'local', b"\n ".join(u1))) if u2: repo.ui.debug(b"%s:\n %s\n" % (header % b'other', b"\n ".join(u2))) fullcopy = copies1.copy() fullcopy.update(copies2) if repo.ui.debugflag: renamedeleteset = set() divergeset = set() for dsts in diverge.values(): divergeset.update(dsts) for dsts in renamedelete.values(): renamedeleteset.update(dsts) repo.ui.debug( b" all copies found (* = to merge, ! = divergent, " b"% = renamed and deleted):\n" ) for f in sorted(fullcopy): note = b"" if f in copy: note += b"*" if f in divergeset: note += b"!" if f in renamedeleteset: note += b"%" repo.ui.debug( b" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f, note) ) del renamedeleteset del divergeset repo.ui.debug(b" checking for directory renames\n") # generate a directory move map d1, d2 = c1.dirs(), c2.dirs() invalid = set() dirmove = {} # examine each file copy for a potential directory move, which is # when all the files in a directory are moved to a new directory for dst, src in pycompat.iteritems(fullcopy): dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst) if dsrc in invalid: # already seen to be uninteresting continue elif dsrc in d1 and ddst in d1: # directory wasn't entirely moved locally invalid.add(dsrc) elif dsrc in d2 and ddst in d2: # directory wasn't entirely moved remotely invalid.add(dsrc) elif dsrc in dirmove and dirmove[dsrc] != ddst: # files from the same directory moved to two different places invalid.add(dsrc) else: # looks good so far dirmove[dsrc] = ddst for i in invalid: if i in dirmove: del dirmove[i] del d1, d2, invalid if not dirmove: return copy, {}, diverge, renamedelete, {} dirmove = {k + b"/": v + b"/" for k, v in pycompat.iteritems(dirmove)} for d in dirmove: repo.ui.debug( b" discovered dir src: '%s' -> dst: '%s'\n" % (d, dirmove[d]) ) movewithdir = {} # check unaccounted nonoverlapping files against directory moves for f in u1 + u2: if f not in fullcopy: for d in dirmove: if f.startswith(d): # new file added in a directory that was moved, move it df = dirmove[d] + f[len(d) :] if df not in copy: movewithdir[f] = df repo.ui.debug( b" pending file src: '%s' -> dst: '%s'\n" % (f, df) ) break return copy, movewithdir, diverge, renamedelete, dirmove def _heuristicscopytracing(repo, c1, c2, base): """ Fast copytracing using filename heuristics Assumes that moves or renames are of following two types: 1) Inside a directory only (same directory name but different filenames) 2) Move from one directory to another (same filenames but different directory names) Works only when there are no merge commits in the "source branch". Source branch is commits from base up to c2 not including base. If merge is involved it fallbacks to _fullcopytracing(). Can be used by setting the following config: [experimental] copytrace = heuristics In some cases the copy/move candidates found by heuristics can be very large in number and that will make the algorithm slow. The number of possible candidates to check can be limited by using the config `experimental.copytrace.movecandidateslimit` which defaults to 100. """ if c1.rev() is None: c1 = c1.p1() if c2.rev() is None: c2 = c2.p1() copies = {} changedfiles = set() m1 = c1.manifest() if not repo.revs(b'%d::%d', base.rev(), c2.rev()): # If base is not in c2 branch, we switch to fullcopytracing repo.ui.debug( b"switching to full copytracing as base is not " b"an ancestor of c2\n" ) return _fullcopytracing(repo, c1, c2, base) ctx = c2 while ctx != base: if len(ctx.parents()) == 2: # To keep things simple let's not handle merges repo.ui.debug(b"switching to full copytracing because of merges\n") return _fullcopytracing(repo, c1, c2, base) changedfiles.update(ctx.files()) ctx = ctx.p1() cp = _forwardcopies(base, c2) for dst, src in pycompat.iteritems(cp): if src in m1: copies[dst] = src # file is missing if it isn't present in the destination, but is present in # the base and present in the source. # Presence in the base is important to exclude added files, presence in the # source is important to exclude removed files. filt = lambda f: f not in m1 and f in base and f in c2 missingfiles = [f for f in changedfiles if filt(f)] if missingfiles: basenametofilename = collections.defaultdict(list) dirnametofilename = collections.defaultdict(list) for f in m1.filesnotin(base.manifest()): basename = os.path.basename(f) dirname = os.path.dirname(f) basenametofilename[basename].append(f) dirnametofilename[dirname].append(f) for f in missingfiles: basename = os.path.basename(f) dirname = os.path.dirname(f) samebasename = basenametofilename[basename] samedirname = dirnametofilename[dirname] movecandidates = samebasename + samedirname # f is guaranteed to be present in c2, that's why # c2.filectx(f) won't fail f2 = c2.filectx(f) # we can have a lot of candidates which can slow down the heuristics # config value to limit the number of candidates moves to check maxcandidates = repo.ui.configint( b'experimental', b'copytrace.movecandidateslimit' ) if len(movecandidates) > maxcandidates: repo.ui.status( _( b"skipping copytracing for '%s', more " b"candidates than the limit: %d\n" ) % (f, len(movecandidates)) ) continue for candidate in movecandidates: f1 = c1.filectx(candidate) if _related(f1, f2): # if there are a few related copies then we'll merge # changes into all of them. This matches the behaviour # of upstream copytracing copies[candidate] = f return copies, {}, {}, {}, {} def _related(f1, f2): """return True if f1 and f2 filectx have a common ancestor Walk back to common ancestor to see if the two files originate from the same file. Since workingfilectx's rev() is None it messes up the integer comparison logic, hence the pre-step check for None (f1 and f2 can only be workingfilectx's initially). """ if f1 == f2: return True # a match g1, g2 = f1.ancestors(), f2.ancestors() try: f1r, f2r = f1.linkrev(), f2.linkrev() if f1r is None: f1 = next(g1) if f2r is None: f2 = next(g2) while True: f1r, f2r = f1.linkrev(), f2.linkrev() if f1r > f2r: f1 = next(g1) elif f2r > f1r: f2 = next(g2) else: # f1 and f2 point to files in the same linkrev return f1 == f2 # true if they point to the same file except StopIteration: return False def graftcopies(wctx, ctx, base): """reproduce copies between base and ctx in the wctx Unlike mergecopies(), this function will only consider copies between base and ctx; it will ignore copies between base and wctx. Also unlike mergecopies(), this function will apply copies to the working copy (instead of just returning information about the copies). That makes it cheaper (especially in the common case of base==ctx.p1()) and useful also when experimental.copytrace=off. merge.update() will have already marked most copies, but it will only mark copies if it thinks the source files are related (see merge._related()). It will also not mark copies if the file wasn't modified on the local side. This function adds the copies that were "missed" by merge.update(). """ new_copies = pathcopies(base, ctx) _filter(wctx.p1(), wctx, new_copies) for dst, src in pycompat.iteritems(new_copies): wctx[dst].markcopied(src) def computechangesetfilesadded(ctx): """return the list of files added in a changeset """ added = [] for f in ctx.files(): if not any(f in p for p in ctx.parents()): added.append(f) return added def computechangesetfilesremoved(ctx): """return the list of files removed in a changeset """ removed = [] for f in ctx.files(): if f not in ctx: removed.append(f) return removed def computechangesetcopies(ctx): """return the copies data for a changeset The copies data are returned as a pair of dictionnary (p1copies, p2copies). Each dictionnary are in the form: `{newname: oldname}` """ p1copies = {} p2copies = {} p1 = ctx.p1() p2 = ctx.p2() narrowmatch = ctx._repo.narrowmatch() for dst in ctx.files(): if not narrowmatch(dst) or dst not in ctx: continue copied = ctx[dst].renamed() if not copied: continue src, srcnode = copied if src in p1 and p1[src].filenode() == srcnode: p1copies[dst] = src elif src in p2 and p2[src].filenode() == srcnode: p2copies[dst] = src return p1copies, p2copies def encodecopies(files, copies): items = [] for i, dst in enumerate(files): if dst in copies: items.append(b'%d\0%s' % (i, copies[dst])) if len(items) != len(copies): raise error.ProgrammingError( b'some copy targets missing from file list' ) return b"\n".join(items) def decodecopies(files, data): try: copies = {} if not data: return copies for l in data.split(b'\n'): strindex, src = l.split(b'\0') i = int(strindex) dst = files[i] copies[dst] = src return copies except (ValueError, IndexError): # Perhaps someone had chosen the same key name (e.g. "p1copies") and # used different syntax for the value. return None def encodefileindices(files, subset): subset = set(subset) indices = [] for i, f in enumerate(files): if f in subset: indices.append(b'%d' % i) return b'\n'.join(indices) def decodefileindices(files, data): try: subset = [] if not data: return subset for strindex in data.split(b'\n'): i = int(strindex) if i < 0 or i >= len(files): return None subset.append(files[i]) return subset except (ValueError, IndexError): # Perhaps someone had chosen the same key name (e.g. "added") and # used different syntax for the value. return None def _getsidedata(srcrepo, rev): ctx = srcrepo[rev] filescopies = computechangesetcopies(ctx) filesadded = computechangesetfilesadded(ctx) filesremoved = computechangesetfilesremoved(ctx) sidedata = {} if any([filescopies, filesadded, filesremoved]): sortedfiles = sorted(ctx.files()) p1copies, p2copies = filescopies p1copies = encodecopies(sortedfiles, p1copies) p2copies = encodecopies(sortedfiles, p2copies) filesadded = encodefileindices(sortedfiles, filesadded) filesremoved = encodefileindices(sortedfiles, filesremoved) if p1copies: sidedata[sidedatamod.SD_P1COPIES] = p1copies if p2copies: sidedata[sidedatamod.SD_P2COPIES] = p2copies if filesadded: sidedata[sidedatamod.SD_FILESADDED] = filesadded if filesremoved: sidedata[sidedatamod.SD_FILESREMOVED] = filesremoved return sidedata def getsidedataadder(srcrepo, destrepo): use_w = srcrepo.ui.configbool(b'experimental', b'worker.repository-upgrade') if pycompat.iswindows or not use_w: return _get_simple_sidedata_adder(srcrepo, destrepo) else: return _get_worker_sidedata_adder(srcrepo, destrepo) def _sidedata_worker(srcrepo, revs_queue, sidedata_queue, tokens): """The function used by worker precomputing sidedata It read an input queue containing revision numbers It write in an output queue containing (rev, ) The `None` input value is used as a stop signal. The `tokens` semaphore is user to avoid having too many unprocessed entries. The workers needs to acquire one token before fetching a task. They will be released by the consumer of the produced data. """ tokens.acquire() rev = revs_queue.get() while rev is not None: data = _getsidedata(srcrepo, rev) sidedata_queue.put((rev, data)) tokens.acquire() rev = revs_queue.get() # processing of `None` is completed, release the token. tokens.release() BUFF_PER_WORKER = 50 def _get_worker_sidedata_adder(srcrepo, destrepo): """The parallel version of the sidedata computation This code spawn a pool of worker that precompute a buffer of sidedata before we actually need them""" # avoid circular import copies -> scmutil -> worker -> copies from . import worker nbworkers = worker._numworkers(srcrepo.ui) tokens = multiprocessing.BoundedSemaphore(nbworkers * BUFF_PER_WORKER) revsq = multiprocessing.Queue() sidedataq = multiprocessing.Queue() assert srcrepo.filtername is None # queue all tasks beforehand, revision numbers are small and it make # synchronisation simpler # # Since the computation for each node can be quite expensive, the overhead # of using a single queue is not revelant. In practice, most computation # are fast but some are very expensive and dominate all the other smaller # cost. for r in srcrepo.changelog.revs(): revsq.put(r) # queue the "no more tasks" markers for i in range(nbworkers): revsq.put(None) allworkers = [] for i in range(nbworkers): args = (srcrepo, revsq, sidedataq, tokens) w = multiprocessing.Process(target=_sidedata_worker, args=args) allworkers.append(w) w.start() # dictionnary to store results for revision higher than we one we are # looking for. For example, if we need the sidedatamap for 42, and 43 is # received, when shelve 43 for later use. staging = {} def sidedata_companion(revlog, rev): sidedata = {} if util.safehasattr(revlog, b'filteredrevs'): # this is a changelog # Is the data previously shelved ? sidedata = staging.pop(rev, None) if sidedata is None: # look at the queued result until we find the one we are lookig # for (shelve the other ones) r, sidedata = sidedataq.get() while r != rev: staging[r] = sidedata r, sidedata = sidedataq.get() tokens.release() return False, (), sidedata return sidedata_companion def _get_simple_sidedata_adder(srcrepo, destrepo): """The simple version of the sidedata computation It just compute it in the same thread on request""" def sidedatacompanion(revlog, rev): sidedata = {} if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog sidedata = _getsidedata(srcrepo, rev) return False, (), sidedata return sidedatacompanion def getsidedataremover(srcrepo, destrepo): def sidedatacompanion(revlog, rev): f = () if util.safehasattr(revlog, 'filteredrevs'): # this is a changelog if revlog.flags(rev) & REVIDX_SIDEDATA: f = ( sidedatamod.SD_P1COPIES, sidedatamod.SD_P2COPIES, sidedatamod.SD_FILESADDED, sidedatamod.SD_FILESREMOVED, ) return False, f, {} return sidedatacompanion