view hgext/largefiles/reposetup.py @ 15793:3ef07ecdb0d5

largefiles: correctly handle dirstate status when rebasing

When rebasing, we need to trust that the standins are always correct. The
rebase operation updates the standins according to the changeset it is
rebasing. We need to make the largefiles in the working copy match.  If we
don't make them match, then they get accidentally reverted, either during
the rebase or during the next commit after the rebase.

This worked previously only becuase we were relying on the behavior that
largefiles with a changed standin, but unchanged contents, never showed up in
the list of modified largefiles.  Unfortunately, pre-commit hooks can get
an incorrect status this way, and it also results in extra execution of code.

The solution is to simply trust the standins when we are about to commit a
rebased changeset, and politely ask updatelfiles() to pull the new contents
down.  In this case, updatelfiles() will also mark any files it has pulled
down as dirty in the lfdirstate so that pre-commit hooks will get correct
status output.

# Copyright 2009-2010 Gregory P. Ward
# Copyright 2009-2010 Intelerad Medical Systems Incorporated
# Copyright 2010-2011 Fog Creek Software
# Copyright 2010-2011 Unity Technologies
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''setup for largefiles repositories: reposetup'''
import copy
import types
import os

from mercurial import context, error, manifest, match as match_, util
from mercurial import node as node_
from mercurial.i18n import _

import lfcommands
import proto
import lfutil

def reposetup(ui, repo):
    # wire repositories should be given new wireproto functions but not the
    # other largefiles modifications
    if not repo.local():
        return proto.wirereposetup(ui, repo)

    for name in ('status', 'commitctx', 'commit', 'push'):
        method = getattr(repo, name)
        if (isinstance(method, types.FunctionType) and
            method.func_name == 'wrap'):
            ui.warn(_('largefiles: repo method %r appears to have already been'
                    ' wrapped by another extension: '
                    'largefiles may behave incorrectly\n')
                    % name)

    class lfiles_repo(repo.__class__):
        lfstatus = False
        def status_nolfiles(self, *args, **kwargs):
            return super(lfiles_repo, self).status(*args, **kwargs)

        # When lfstatus is set, return a context that gives the names
        # of largefiles instead of their corresponding standins and
        # identifies the largefiles as always binary, regardless of
        # their actual contents.
        def __getitem__(self, changeid):
            ctx = super(lfiles_repo, self).__getitem__(changeid)
            if self.lfstatus:
                class lfiles_manifestdict(manifest.manifestdict):
                    def __contains__(self, filename):
                        if super(lfiles_manifestdict,
                                self).__contains__(filename):
                            return True
                        return super(lfiles_manifestdict,
                            self).__contains__(lfutil.standin(filename))
                class lfiles_ctx(ctx.__class__):
                    def files(self):
                        filenames = super(lfiles_ctx, self).files()
                        return [lfutil.splitstandin(f) or f for f in filenames]
                    def manifest(self):
                        man1 = super(lfiles_ctx, self).manifest()
                        man1.__class__ = lfiles_manifestdict
                        return man1
                    def filectx(self, path, fileid=None, filelog=None):
                        try:
                            result = super(lfiles_ctx, self).filectx(path,
                                fileid, filelog)
                        except error.LookupError:
                            # Adding a null character will cause Mercurial to
                            # identify this as a binary file.
                            result = super(lfiles_ctx, self).filectx(
                                lfutil.standin(path), fileid, filelog)
                            olddata = result.data
                            result.data = lambda: olddata() + '\0'
                        return result
                ctx.__class__ = lfiles_ctx
            return ctx

        # Figure out the status of big files and insert them into the
        # appropriate list in the result. Also removes standin files
        # from the listing. Revert to the original status if
        # self.lfstatus is False.
        def status(self, node1='.', node2=None, match=None, ignored=False,
                clean=False, unknown=False, listsubrepos=False):
            listignored, listclean, listunknown = ignored, clean, unknown
            if not self.lfstatus:
                return super(lfiles_repo, self).status(node1, node2, match,
                    listignored, listclean, listunknown, listsubrepos)
            else:
                # some calls in this function rely on the old version of status
                self.lfstatus = False
                if isinstance(node1, context.changectx):
                    ctx1 = node1
                else:
                    ctx1 = repo[node1]
                if isinstance(node2, context.changectx):
                    ctx2 = node2
                else:
                    ctx2 = repo[node2]
                working = ctx2.rev() is None
                parentworking = working and ctx1 == self['.']

                def inctx(file, ctx):
                    try:
                        if ctx.rev() is None:
                            return file in ctx.manifest()
                        ctx[file]
                        return True
                    except KeyError:
                        return False

                if match is None:
                    match = match_.always(self.root, self.getcwd())

                # First check if there were files specified on the
                # command line.  If there were, and none of them were
                # largefiles, we should just bail here and let super
                # handle it -- thus gaining a big performance boost.
                lfdirstate = lfutil.openlfdirstate(ui, self)
                if match.files() and not match.anypats():
                    matchedfiles = [f for f in match.files() if f in lfdirstate]
                    if not matchedfiles:
                        return super(lfiles_repo, self).status(node1, node2,
                                match, listignored, listclean,
                                listunknown, listsubrepos)

                # Create a copy of match that matches standins instead
                # of largefiles.
                def tostandin(file):
                    if inctx(lfutil.standin(file), ctx2):
                        return lfutil.standin(file)
                    return file

                # Create a function that we can use to override what is
                # normally the ignore matcher.  We've already checked
                # for ignored files on the first dirstate walk, and
                # unecessarily re-checking here causes a huge performance
                # hit because lfdirstate only knows about largefiles
                def _ignoreoverride(self):
                    return False

                m = copy.copy(match)
                m._files = [tostandin(f) for f in m._files]

                # Get ignored files here even if we weren't asked for them; we
                # must use the result here for filtering later
                result = super(lfiles_repo, self).status(node1, node2, m,
                    True, clean, unknown, listsubrepos)
                if working:
                    # hold the wlock while we read largefiles and
                    # update the lfdirstate
                    wlock = repo.wlock()
                    try:
                        # Any non-largefiles that were explicitly listed must be
                        # taken out or lfdirstate.status will report an error.
                        # The status of these files was already computed using
                        # super's status.
                        # Override lfdirstate's ignore matcher to not do
                        # anything
                        orig_ignore = lfdirstate._ignore
                        lfdirstate._ignore = _ignoreoverride

                        match._files = [f for f in match._files if f in
                            lfdirstate]
                        # Don't waste time getting the ignored and unknown
                        # files again; we already have them
                        s = lfdirstate.status(match, [], False,
                                listclean, False)
                        (unsure, modified, added, removed, missing, unknown,
                                ignored, clean) = s
                        # Replace the list of ignored and unknown files with
                        # the previously caclulated lists, and strip out the
                        # largefiles
                        lfiles = set(lfdirstate._map)
                        ignored = set(result[5]).difference(lfiles)
                        unknown = set(result[4]).difference(lfiles)
                        if parentworking:
                            for lfile in unsure:
                                standin = lfutil.standin(lfile)
                                if standin not in ctx1:
                                    # from second parent
                                    modified.append(lfile)
                                elif ctx1[standin].data().strip() \
                                        != lfutil.hashfile(self.wjoin(lfile)):
                                    modified.append(lfile)
                                else:
                                    clean.append(lfile)
                                    lfdirstate.normal(lfile)
                            lfdirstate.write()
                        else:
                            tocheck = unsure + modified + added + clean
                            modified, added, clean = [], [], []

                            for lfile in tocheck:
                                standin = lfutil.standin(lfile)
                                if inctx(standin, ctx1):
                                    if ctx1[standin].data().strip() != \
                                            lfutil.hashfile(self.wjoin(lfile)):
                                        modified.append(lfile)
                                    else:
                                        clean.append(lfile)
                                else:
                                    added.append(lfile)
                        # Replace the original ignore function
                        lfdirstate._ignore = orig_ignore
                    finally:
                        wlock.release()

                    for standin in ctx1.manifest():
                        if not lfutil.isstandin(standin):
                            continue
                        lfile = lfutil.splitstandin(standin)
                        if not match(lfile):
                            continue
                        if lfile not in lfdirstate:
                            removed.append(lfile)

                    # Filter result lists
                    result = list(result)

                    # Largefiles are not really removed when they're
                    # still in the normal dirstate. Likewise, normal
                    # files are not really removed if it's still in
                    # lfdirstate. This happens in merges where files
                    # change type.
                    removed = [f for f in removed if f not in repo.dirstate]
                    result[2] = [f for f in result[2] if f not in lfdirstate]

                    # Unknown files
                    unknown = set(unknown).difference(ignored)
                    result[4] = [f for f in unknown
                                 if (repo.dirstate[f] == '?' and
                                     not lfutil.isstandin(f))]
                    # Ignored files were calculated earlier by the dirstate,
                    # and we already stripped out the largefiles from the list
                    result[5] = ignored
                    # combine normal files and largefiles
                    normals = [[fn for fn in filelist
                                if not lfutil.isstandin(fn)]
                               for filelist in result]
                    lfiles = (modified, added, removed, missing, [], [], clean)
                    result = [sorted(list1 + list2)
                              for (list1, list2) in zip(normals, lfiles)]
                else:
                    def toname(f):
                        if lfutil.isstandin(f):
                            return lfutil.splitstandin(f)
                        return f
                    result = [[toname(f) for f in items] for items in result]

                if not listunknown:
                    result[4] = []
                if not listignored:
                    result[5] = []
                if not listclean:
                    result[6] = []
                self.lfstatus = True
                return result

        # As part of committing, copy all of the largefiles into the
        # cache.
        def commitctx(self, *args, **kwargs):
            node = super(lfiles_repo, self).commitctx(*args, **kwargs)
            ctx = self[node]
            for filename in ctx.files():
                if lfutil.isstandin(filename) and filename in ctx.manifest():
                    realfile = lfutil.splitstandin(filename)
                    lfutil.copytostore(self, ctx.node(), realfile)

            return node

        # Before commit, largefile standins have not had their
        # contents updated to reflect the hash of their largefile.
        # Do that here.
        def commit(self, text="", user=None, date=None, match=None,
                force=False, editor=False, extra={}):
            orig = super(lfiles_repo, self).commit

            wlock = repo.wlock()
            try:
                # Case 0: Rebase
                # We have to take the time to pull down the new largefiles now.
                # Otherwise if we are rebasing, any largefiles that were
                # modified in the destination changesets get overwritten, either
                # by the rebase or in the first commit after the rebase.
                # updatelfiles will update the dirstate to mark any pulled
                # largefiles as modified
                if getattr(repo, "_isrebasing", False):
                    lfcommands.updatelfiles(repo.ui, repo)
                    result = orig(text=text, user=user, date=date, match=match,
                                    force=force, editor=editor, extra=extra)
                    return result
                # Case 1: user calls commit with no specific files or
                # include/exclude patterns: refresh and commit all files that
                # are "dirty".
                if ((match is None) or
                    (not match.anypats() and not match.files())):
                    # Spend a bit of time here to get a list of files we know
                    # are modified so we can compare only against those.
                    # It can cost a lot of time (several seconds)
                    # otherwise to update all standins if the largefiles are
                    # large.
                    lfdirstate = lfutil.openlfdirstate(ui, self)
                    dirtymatch = match_.always(repo.root, repo.getcwd())
                    s = lfdirstate.status(dirtymatch, [], False, False, False)
                    modifiedfiles = []
                    for i in s:
                        modifiedfiles.extend(i)
                    lfiles = lfutil.listlfiles(self)
                    # this only loops through largefiles that exist (not
                    # removed/renamed)
                    for lfile in lfiles:
                        if lfile in modifiedfiles:
                            if os.path.exists(self.wjoin(lfutil.standin(lfile))):
                                # this handles the case where a rebase is being
                                # performed and the working copy is not updated
                                # yet.
                                if os.path.exists(self.wjoin(lfile)):
                                    lfutil.updatestandin(self,
                                        lfutil.standin(lfile))
                                    lfdirstate.normal(lfile)
                    for lfile in lfdirstate:
                        if lfile in modifiedfiles:
                            if not os.path.exists(
                                    repo.wjoin(lfutil.standin(lfile))):
                                lfdirstate.drop(lfile)
                    lfdirstate.write()

                    return orig(text=text, user=user, date=date, match=match,
                                    force=force, editor=editor, extra=extra)

                for f in match.files():
                    if lfutil.isstandin(f):
                        raise util.Abort(
                            _('file "%s" is a largefile standin') % f,
                            hint=('commit the largefile itself instead'))

                # Case 2: user calls commit with specified patterns: refresh
                # any matching big files.
                smatcher = lfutil.composestandinmatcher(self, match)
                standins = lfutil.dirstate_walk(self.dirstate, smatcher)

                # No matching big files: get out of the way and pass control to
                # the usual commit() method.
                if not standins:
                    return orig(text=text, user=user, date=date, match=match,
                                    force=force, editor=editor, extra=extra)

                # Refresh all matching big files.  It's possible that the
                # commit will end up failing, in which case the big files will
                # stay refreshed.  No harm done: the user modified them and
                # asked to commit them, so sooner or later we're going to
                # refresh the standins.  Might as well leave them refreshed.
                lfdirstate = lfutil.openlfdirstate(ui, self)
                for standin in standins:
                    lfile = lfutil.splitstandin(standin)
                    if lfdirstate[lfile] <> 'r':
                        lfutil.updatestandin(self, standin)
                        lfdirstate.normal(lfile)
                    else:
                        lfdirstate.drop(lfile)
                lfdirstate.write()

                # Cook up a new matcher that only matches regular files or
                # standins corresponding to the big files requested by the
                # user.  Have to modify _files to prevent commit() from
                # complaining "not tracked" for big files.
                lfiles = lfutil.listlfiles(repo)
                match = copy.copy(match)
                orig_matchfn = match.matchfn

                # Check both the list of largefiles and the list of
                # standins because if a largefile was removed, it
                # won't be in the list of largefiles at this point
                match._files += sorted(standins)

                actualfiles = []
                for f in match._files:
                    fstandin = lfutil.standin(f)

                    # ignore known largefiles and standins
                    if f in lfiles or fstandin in standins:
                        continue

                    # append directory separator to avoid collisions
                    if not fstandin.endswith(os.sep):
                        fstandin += os.sep

                    # prevalidate matching standin directories
                    if util.any(st for st in match._files
                                   if st.startswith(fstandin)):
                        continue
                    actualfiles.append(f)
                match._files = actualfiles

                def matchfn(f):
                    if orig_matchfn(f):
                        return f not in lfiles
                    else:
                        return f in standins

                match.matchfn = matchfn
                return orig(text=text, user=user, date=date, match=match,
                                force=force, editor=editor, extra=extra)
            finally:
                wlock.release()

        def push(self, remote, force=False, revs=None, newbranch=False):
            o = lfutil.findoutgoing(repo, remote, force)
            if o:
                toupload = set()
                o = repo.changelog.nodesbetween(o, revs)[0]
                for n in o:
                    parents = [p for p in repo.changelog.parents(n)
                               if p != node_.nullid]
                    ctx = repo[n]
                    files = set(ctx.files())
                    if len(parents) == 2:
                        mc = ctx.manifest()
                        mp1 = ctx.parents()[0].manifest()
                        mp2 = ctx.parents()[1].manifest()
                        for f in mp1:
                            if f not in mc:
                                files.add(f)
                        for f in mp2:
                            if f not in mc:
                                files.add(f)
                        for f in mc:
                            if mc[f] != mp1.get(f, None) or mc[f] != mp2.get(f,
                                    None):
                                files.add(f)

                    toupload = toupload.union(
                        set([ctx[f].data().strip()
                             for f in files
                             if lfutil.isstandin(f) and f in ctx]))
                lfcommands.uploadlfiles(ui, self, remote, toupload)
            return super(lfiles_repo, self).push(remote, force, revs,
                newbranch)

    repo.__class__ = lfiles_repo

    def checkrequireslfiles(ui, repo, **kwargs):
        if 'largefiles' not in repo.requirements and util.any(
                lfutil.shortname+'/' in f[0] for f in repo.store.datafiles()):
            repo.requirements.add('largefiles')
            repo._writerequirements()

    ui.setconfig('hooks', 'changegroup.lfiles', checkrequireslfiles)
    ui.setconfig('hooks', 'commit.lfiles', checkrequireslfiles)