# verify.py - repository integrity checking for Mercurial

#

# Copyright 2006, 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 os

from .i18n import _

from .node import (

    nullid,

    short,

)

from . import (

    error,

    revlog,

    util,

)

def verify(repo):

    with repo.lock():

        return verifier(repo).verify()

def _normpath(f):

    # under hg < 2.4, convert didn't sanitize paths properly, so a

    # converted repo may contain repeated slashes

    while '//' in f:

        f = f.replace('//', '/')

    return f

def _validpath(repo, path):

    """Returns False if a path should NOT be treated as part of a repo.

    For all in-core cases, this returns True, as we have no way for a

    path to be mentioned in the history but not actually be

    relevant. For narrow clones, this is important because many

    filelogs will be missing, and changelog entries may mention

    modified files that are outside the narrow scope.

    """

    return True

class verifier(object):

    def __init__(self, repo):

        self.repo = repo.unfiltered()

        self.ui = repo.ui

        self.badrevs = set()

        self.errors = 0

        self.warnings = 0

        self.havecl = len(repo.changelog) > 0

        self.havemf = len(repo.manifest) > 0

        self.revlogv1 = repo.changelog.version != revlog.REVLOGV0

        self.lrugetctx = util.lrucachefunc(repo.changectx)

        self.refersmf = False

        self.fncachewarned = False

    def warn(self, msg):

        self.ui.warn(msg + "\n")

        self.warnings += 1

    def err(self, linkrev, msg, filename=None):

        if linkrev is not None:

            self.badrevs.add(linkrev)

        else:

            linkrev = '?'

        msg = "%s: %s" % (linkrev, msg)

        if filename:

            msg = "%s@%s" % (filename, msg)

        self.ui.warn(" " + msg + "\n")

        self.errors += 1

    def exc(self, linkrev, msg, inst, filename=None):

        if not str(inst):

            inst = repr(inst)

        self.err(linkrev, "%s: %s" % (msg, inst), filename)

    def checklog(self, obj, name, linkrev):

        if not len(obj) and (self.havecl or self.havemf):

            self.err(linkrev, _("empty or missing %s") % name)

            return

        d = obj.checksize()

        if d[0]:

            self.err(None, _("data length off by %d bytes") % d[0], name)

        if d[1]:

            self.err(None, _("index contains %d extra bytes") % d[1], name)

        if obj.version != revlog.REVLOGV0:

            if not self.revlogv1:

                self.warn(_("warning: `%s' uses revlog format 1") % name)

        elif self.revlogv1:

            self.warn(_("warning: `%s' uses revlog format 0") % name)

    def checkentry(self, obj, i, node, seen, linkrevs, f):

        lr = obj.linkrev(obj.rev(node))

        if lr < 0 or (self.havecl and lr not in linkrevs):

            if lr < 0 or lr >= len(self.repo.changelog):

                msg = _("rev %d points to nonexistent changeset %d")

            else:

                msg = _("rev %d points to unexpected changeset %d")

            self.err(None, msg % (i, lr), f)

            if linkrevs:

                if f and len(linkrevs) > 1:

                    try:

                        # attempt to filter down to real linkrevs

                        linkrevs = [l for l in linkrevs

                                    if self.lrugetctx(l)[f].filenode() == node]

                    except Exception:

                        pass

                self.warn(_(" (expected %s)") % " ".join(map(str, linkrevs)))

            lr = None # can't be trusted

        try:

            p1, p2 = obj.parents(node)

            if p1 not in seen and p1 != nullid:

                self.err(lr, _("unknown parent 1 %s of %s") %

                    (short(p1), short(node)), f)

            if p2 not in seen and p2 != nullid:

                self.err(lr, _("unknown parent 2 %s of %s") %

                    (short(p2), short(node)), f)

        except Exception as inst:

            self.exc(lr, _("checking parents of %s") % short(node), inst, f)

        if node in seen:

            self.err(lr, _("duplicate revision %d (%d)") % (i, seen[node]), f)

        seen[node] = i

        return lr

    def verify(self):

        repo = self.repo

        ui = repo.ui

        if not repo.url().startswith('file:'):

            raise error.Abort(_("cannot verify bundle or remote repos"))

        if os.path.exists(repo.sjoin("journal")):

            ui.warn(_("abandoned transaction found - run hg recover\n"))

        if ui.verbose or not self.revlogv1:

            ui.status(_("repository uses revlog format %d\n") %

                           (self.revlogv1 and 1 or 0))

        mflinkrevs, filelinkrevs = self._verifychangelog()

        filenodes = self._verifymanifest(mflinkrevs)

        del mflinkrevs

        self._crosscheckfiles(filelinkrevs, filenodes)

        totalfiles, filerevisions = self._verifyfiles(filenodes, filelinkrevs)

        ui.status(_("%d files, %d changesets, %d total revisions\n") %

                       (totalfiles, len(repo.changelog), filerevisions))

        if self.warnings:

            ui.warn(_("%d warnings encountered!\n") % self.warnings)

        if self.fncachewarned:

            ui.warn(_('hint: run "hg debugrebuildfncache" to recover from '

                      'corrupt fncache\n'))

        if self.errors:

            ui.warn(_("%d integrity errors encountered!\n") % self.errors)

            if self.badrevs:

                ui.warn(_("(first damaged changeset appears to be %d)\n")

                        % min(self.badrevs))

            return 1

    def _verifychangelog(self):

        ui = self.ui

        repo = self.repo

        cl = repo.changelog

        ui.status(_("checking changesets\n"))

        mflinkrevs = {}

        filelinkrevs = {}

        seen = {}

        self.checklog(cl, "changelog", 0)

        total = len(repo)

        for i in repo:

            ui.progress(_('checking'), i, total=total, unit=_('changesets'))

            n = cl.node(i)

            self.checkentry(cl, i, n, seen, [i], "changelog")

            try:

                changes = cl.read(n)

                if changes[0] != nullid:

                    mflinkrevs.setdefault(changes[0], []).append(i)

                    self.refersmf = True

                for f in changes[3]:

                    if _validpath(repo, f):

                        filelinkrevs.setdefault(_normpath(f), []).append(i)

            except Exception as inst:

                self.refersmf = True

                self.exc(i, _("unpacking changeset %s") % short(n), inst)

        ui.progress(_('checking'), None)

        return mflinkrevs, filelinkrevs

    def _verifymanifest(self, mflinkrevs, dir="", storefiles=None,

                        progress=None):

        repo = self.repo

        ui = self.ui

        mf = self.repo.manifest.dirlog(dir)

        if not dir:

            self.ui.status(_("checking manifests\n"))

        filenodes = {}

        subdirnodes = {}

        seen = {}

        label = "manifest"

        if dir:

            label = dir

            revlogfiles = mf.files()

            storefiles.difference_update(revlogfiles)

            if progress: # should be true since we're in a subdirectory

                progress()

        if self.refersmf:

            # Do not check manifest if there are only changelog entries with

            # null manifests.

            self.checklog(mf, label, 0)

        total = len(mf)

        for i in mf:

            if not dir:

                ui.progress(_('checking'), i, total=total, unit=_('manifests'))

            n = mf.node(i)

            lr = self.checkentry(mf, i, n, seen, mflinkrevs.get(n, []), label)

            if n in mflinkrevs:

                del mflinkrevs[n]

            elif dir:

                self.err(lr, _("%s not in parent-directory manifest") %

                         short(n), label)

            else:

                self.err(lr, _("%s not in changesets") % short(n), label)

            try:

                for f, fn, fl in mf.readshallowdelta(n).iterentries():

                    if not f:

                        self.err(lr, _("entry without name in manifest"))

                    elif f == "/dev/null":  # ignore this in very old repos

                        continue

                    fullpath = dir + _normpath(f)

                    if not _validpath(repo, fullpath):

                        continue

                    if fl == 't':

                        subdirnodes.setdefault(fullpath + '/', {}).setdefault(

                            fn, []).append(lr)

                    else:

                        filenodes.setdefault(fullpath, {}).setdefault(fn, lr)

            except Exception as inst:

                self.exc(lr, _("reading delta %s") % short(n), inst, label)

        if not dir:

            ui.progress(_('checking'), None)

        if self.havemf:

            for c, m in sorted([(c, m) for m in mflinkrevs

                        for c in mflinkrevs[m]]):

                if dir:

                    self.err(c, _("parent-directory manifest refers to unknown "

                                  "revision %s") % short(m), label)

                else:

                    self.err(c, _("changeset refers to unknown revision %s") %

                             short(m), label)

        if not dir and subdirnodes:

            self.ui.status(_("checking directory manifests\n"))

            storefiles = set()

            subdirs = set()

            revlogv1 = self.revlogv1

            for f, f2, size in repo.store.datafiles():

                if not f:

                    self.err(None, _("cannot decode filename '%s'") % f2)

                elif (size > 0 or not revlogv1) and f.startswith('meta/'):

                    storefiles.add(_normpath(f))

                    subdirs.add(os.path.dirname(f))

            subdircount = len(subdirs)

            currentsubdir = [0]

            def progress():

                currentsubdir[0] += 1

                ui.progress(_('checking'), currentsubdir[0], total=subdircount,

                            unit=_('manifests'))

        for subdir, linkrevs in subdirnodes.iteritems():

            subdirfilenodes = self._verifymanifest(linkrevs, subdir, storefiles,

                                                   progress)

            for f, onefilenodes in subdirfilenodes.iteritems():

                filenodes.setdefault(f, {}).update(onefilenodes)

        if not dir and subdirnodes:

            ui.progress(_('checking'), None)

            for f in sorted(storefiles):

                self.warn(_("warning: orphan revlog '%s'") % f)

        return filenodes

    def _crosscheckfiles(self, filelinkrevs, filenodes):

        repo = self.repo

        ui = self.ui

        ui.status(_("crosschecking files in changesets and manifests\n"))

        total = len(filelinkrevs) + len(filenodes)

        count = 0

        if self.havemf:

            for f in sorted(filelinkrevs):

                count += 1

                ui.progress(_('crosschecking'), count, total=total)

                if f not in filenodes:

                    lr = filelinkrevs[f][0]

                    self.err(lr, _("in changeset but not in manifest"), f)

        if self.havecl:

            for f in sorted(filenodes):

                count += 1

                ui.progress(_('crosschecking'), count, total=total)

                if f not in filelinkrevs:

                    try:

                        fl = repo.file(f)

                        lr = min([fl.linkrev(fl.rev(n)) for n in filenodes[f]])

                    except Exception:

                        lr = None

                    self.err(lr, _("in manifest but not in changeset"), f)

        ui.progress(_('crosschecking'), None)

    def _verifyfiles(self, filenodes, filelinkrevs):

        repo = self.repo

        ui = self.ui

        lrugetctx = self.lrugetctx

        revlogv1 = self.revlogv1

        havemf = self.havemf

        ui.status(_("checking files\n"))

        storefiles = set()

        for f, f2, size in repo.store.datafiles():

            if not f:

                self.err(None, _("cannot decode filename '%s'") % f2)

            elif (size > 0 or not revlogv1) and f.startswith('data/'):

                storefiles.add(_normpath(f))

        files = sorted(set(filenodes) | set(filelinkrevs))

        total = len(files)

        revisions = 0

        for i, f in enumerate(files):