# verify.py - repository integrity checking for Mercurial

#

# Copyright 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from node import *

from i18n import _

import revlog, mdiff

def verify(repo):

    filelinkrevs = {}

    filenodes = {}

    changesets = revisions = files = 0

    errors = [0]

    warnings = [0]

    neededmanifests = {}

    lock = repo.lock()

    def err(msg):

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

        errors[0] += 1

    def warn(msg):

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

        warnings[0] += 1

    def checksize(obj, name):

        d = obj.checksize()

        if d[0]:

            err(_("%s data length off by %d bytes") % (name, d[0]))

        if d[1]:

            err(_("%s index contains %d extra bytes") % (name, d[1]))

    def checkversion(obj, 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)

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

    if repo.ui.verbose or not revlogv1:

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

                       (revlogv1 and 1 or 0))

    seen = {}

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

    checksize(repo.changelog, "changelog")

    for i in xrange(repo.changelog.count()):

        changesets += 1

        n = repo.changelog.node(i)

        l = repo.changelog.linkrev(n)

        if l != i:

            err(_("incorrect link (%d) for changeset revision %d") %(l, i))

        if n in seen:

            err(_("duplicate changeset at revision %d") % i)

        seen[n] = 1

        for p in repo.changelog.parents(n):

            if p not in repo.changelog.nodemap:

                err(_("changeset %s has unknown parent %s") %

                             (short(n), short(p)))

        try:

            changes = repo.changelog.read(n)

        except KeyboardInterrupt:

            repo.ui.warn(_("interrupted"))

            raise

        except Exception, inst:

            err(_("unpacking changeset %s: %s") % (short(n), inst))

            continue

        neededmanifests[changes[0]] = n

        for f in changes[3]:

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

    seen = {}

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

    checkversion(repo.manifest, "manifest")

    checksize(repo.manifest, "manifest")

    for i in xrange(repo.manifest.count()):

        n = repo.manifest.node(i)

        l = repo.manifest.linkrev(n)

        if l < 0 or l >= repo.changelog.count():

            err(_("bad manifest link (%d) at revision %d") % (l, i))

        if n in neededmanifests:

            del neededmanifests[n]

        if n in seen:

            err(_("duplicate manifest at revision %d") % i)

        seen[n] = 1

        for p in repo.manifest.parents(n):

            if p not in repo.manifest.nodemap:

                err(_("manifest %s has unknown parent %s") %

                    (short(n), short(p)))

        try:

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

                filenodes.setdefault(f, {})[fn] = 1

        except KeyboardInterrupt:

            repo.ui.warn(_("interrupted"))

            raise

        except Exception, inst:

            err(_("reading delta for manifest %s: %s") % (short(n), inst))

            continue

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

    for m, c in neededmanifests.items():

        err(_("Changeset %s refers to unknown manifest %s") %

            (short(m), short(c)))

    del neededmanifests

    for f in filenodes:

        if f not in filelinkrevs:

            err(_("file %s in manifest but not in changesets") % f)

    for f in filelinkrevs:

        if f not in filenodes:

            err(_("file %s in changeset but not in manifest") % f)

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

    ff = filenodes.keys()

    ff.sort()

    for f in ff:

        if f == "/dev/null":

            continue

        files += 1

        if not f:

            err(_("file without name in manifest %s") % short(n))

            continue

        fl = repo.file(f)

        checkversion(fl, f)

        checksize(fl, f)

        nodes = {nullid: 1}

        seen = {}

        for i in xrange(fl.count()):

            revisions += 1

            n = fl.node(i)

            if n in seen:

                err(_("%s: duplicate revision %d") % (f, i))

            if n not in filenodes[f]:

                err(_("%s: %d:%s not in manifests") % (f, i, short(n)))

            else:

                del filenodes[f][n]

            flr = fl.linkrev(n)

            if flr not in filelinkrevs.get(f, []):

                err(_("%s:%s points to unexpected changeset %d")

                        % (f, short(n), flr))

            else:

                filelinkrevs[f].remove(flr)

            # verify contents

            try:

                t = fl.read(n)

            except KeyboardInterrupt:

                repo.ui.warn(_("interrupted"))

                raise

            except Exception, inst:

                err(_("unpacking file %s %s: %s") % (f, short(n), inst))

            # verify parents

            (p1, p2) = fl.parents(n)

            if p1 not in nodes:

                err(_("file %s:%s unknown parent 1 %s") %

                    (f, short(n), short(p1)))

            if p2 not in nodes:

                err(_("file %s:%s unknown parent 2 %s") %

                        (f, short(n), short(p1)))

            nodes[n] = 1

            # check renames

            try:

                rp = fl.renamed(n)

                if rp:

                    fl2 = repo.file(rp[0])

                    rev = fl2.rev(rp[1])

            except KeyboardInterrupt:

                repo.ui.warn(_("interrupted"))

                raise

            except Exception, inst:

                err(_("checking rename on file %s %s: %s") % (f, short(n), inst))

        # cross-check

        for node in filenodes[f]:

            err(_("node %s in manifests not in %s") % (hex(node), f))

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

                   (files, changesets, revisions))

    if warnings[0]:

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

    if errors[0]:

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

        return 1