# 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):

    lock = repo.lock()

    try:

        return _verify(repo)

    finally:

        lock.release()

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 _verify(repo):

    repo = repo.unfiltered()

    mflinkrevs = {}

    filelinkrevs = {}

    filenodes = {}

    revisions = 0

    badrevs = set()

    errors = [0]

    warnings = [0]

    ui = repo.ui

    cl = repo.changelog

    mf = repo.manifest

    lrugetctx = util.lrucachefunc(repo.changectx)

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

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

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

        if linkrev is not None:

            badrevs.add(linkrev)

        else:

            linkrev = '?'

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

        if filename:

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

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

        errors[0] += 1

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

        if isinstance(inst, KeyboardInterrupt):

            ui.warn(_("interrupted"))

            raise

        if not str(inst):

            inst = repr(inst)

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

    def warn(msg):

        ui.warn(msg + "\n")

        warnings[0] += 1

    def checklog(obj, name, linkrev):

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

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

            return

        d = obj.checksize()

        if d[0]:

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

        if d[1]:

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

        if obj.version != revlog.REVLOGV0:

            if not revlogv1:

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

        elif revlogv1:

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

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

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

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

            if lr < 0 or lr >= len(cl):

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

            else:

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

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

                    except Exception:

                        pass

                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:

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

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

            if p2 not in seen and p2 != nullid:

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

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

        except Exception as inst:

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

        if node in seen:

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

        seen[node] = i

        return lr

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

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

    revlogv1 = cl.version != revlog.REVLOGV0

    if ui.verbose or not revlogv1:

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

                       (revlogv1 and 1 or 0))

    havecl = len(cl) > 0

    havemf = len(mf) > 0

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

    refersmf = False

    seen = {}

    checklog(cl, "changelog", 0)

    total = len(repo)

    for i in repo:

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

        n = cl.node(i)

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

        try:

            changes = cl.read(n)

            if changes[0] != nullid:

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

                refersmf = True

            for f in changes[3]:

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

        except Exception as inst:

            refersmf = True

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

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

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

    seen = {}

    if refersmf:

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

        # null manifests.

        checklog(mf, "manifest", 0)

    total = len(mf)

    for i in mf:

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

        n = mf.node(i)

        lr = checkentry(mf, i, n, seen, mflinkrevs.get(n, []), "manifest")

        if n in mflinkrevs:

            del mflinkrevs[n]

        else:

            err(lr, _("%s not in changesets") % short(n), "manifest")

        try:

            for f, fn in mf.readdelta(n).iteritems():

                if not f:

                    err(lr, _("file without name in manifest"))

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

                    filenodes.setdefault(_normpath(f), {}).setdefault(fn, lr)

        except Exception as inst:

            exc(lr, _("reading manifest delta %s") % short(n), inst)

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

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

    total = len(mflinkrevs) + len(filelinkrevs) + len(filenodes)

    count = 0

    if havemf:

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

                            for c in mflinkrevs[m]]):

            count += 1

            if m == nullid:

                continue

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

            err(c, _("changeset refers to unknown manifest %s") % short(m))

        mflinkrevs = None # del is bad here due to scope issues

        for f in sorted(filelinkrevs):

            count += 1

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

            if f not in filenodes:

                lr = filelinkrevs[f][0]

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

    if 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

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

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

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

    storefiles = set()

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

        if not f:

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

        elif size > 0 or not revlogv1:

            storefiles.add(_normpath(f))

    fncachewarned = False

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

    total = len(files)

    for i, f in enumerate(files):

        ui.progress(_('checking'), i, item=f, total=total)

        try:

            linkrevs = filelinkrevs[f]

        except KeyError:

            # in manifest but not in changelog

            linkrevs = []

        if linkrevs:

            lr = linkrevs[0]

        else:

            lr = None

        try:

            fl = repo.file(f)

        except error.RevlogError as e:

            err(lr, _("broken revlog! (%s)") % e, f)

            continue

        for ff in fl.files():

            try:

                storefiles.remove(ff)

            except KeyError:

                warn(_(" warning: revlog '%s' not in fncache!") % ff)

                fncachewarned = True

        checklog(fl, f, lr)

        seen = {}

        rp = None

        for i in fl:

            revisions += 1

            n = fl.node(i)

            lr = checkentry(fl, i, n, seen, linkrevs, f)

            if f in filenodes:

                if havemf and n not in filenodes[f]:

                    err(lr, _("%s not in manifests") % (short(n)), f)

                else:

                    del filenodes[f][n]

            # verify contents

            try:

                l = len(fl.read(n))

                rp = fl.renamed(n)

                if l != fl.size(i):

                    if len(fl.revision(n)) != fl.size(i):

                        err(lr, _("unpacked size is %s, %s expected") %

                            (l, fl.size(i)), f)

            except error.CensoredNodeError:

                # experimental config: censor.policy

                if ui.config("censor", "policy", "abort") == "abort":

                    err(lr, _("censored file data"), f)

            except Exception as inst:

                exc(lr, _("unpacking %s") % short(n), inst, f)

            # check renames

            try:

                if rp:

                    if lr is not None and ui.verbose:

                        ctx = lrugetctx(lr)

                        found = False

                        for pctx in ctx.parents():

                            if rp[0] in pctx:

                                found = True

                                break

                        if not found:

                            warn(_("warning: copy source of '%s' not"

                                   " in parents of %s") % (f, ctx))

                    fl2 = repo.file(rp[0])

                    if not len(fl2):

                        err(lr, _("empty or missing copy source revlog %s:%s")

                            % (rp[0], short(rp[1])), f)

                    elif rp[1] == nullid:

                        ui.note(_("warning: %s@%s: copy source"

                                  " revision is nullid %s:%s\n")

                            % (f, lr, rp[0], short(rp[1])))

                    else:

                        fl2.rev(rp[1])

            except Exception as inst:

                exc(lr, _("checking rename of %s") % short(n), inst, f)

        # cross-check

        if f in filenodes:

            fns = [(lr, n) for n, lr in filenodes[f].iteritems()]

            for lr, node in sorted(fns):

                err(lr, _("%s in manifests not found") % short(node), f)

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

    for f in storefiles:

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

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

                   (len(files), len(cl), revisions))

    if warnings[0]:

        ui.warn(_("%d warnings encountered!\n") % warnings[0])

    if fncachewarned:

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

                  'corrupt fncache\n'))

    if errors[0]:

        ui.warn(_("%d integrity errors encountered!\n") % errors[0])

        if badrevs:

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

                    % min(badrevs))

        return 1