# 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, incorporated herein by reference.

from node import *

from i18n import _

import revlog

def verify(repo):

    lock = repo.lock()

    try:

        return _verify(repo)

    finally:

        del lock

def _verify(repo):

    filelinkrevs = {}

    filenodes = {}

    changesets = revisions = files = 0

    firstbad = [None]

    errors = [0]

    warnings = [0]

    neededmanifests = {}

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

        if linkrev != None:

            if firstbad[0] != None:

                firstbad[0] = min(firstbad[0], linkrev)

            else:

                firstbad[0] = linkrev

        else:

            linkrev = "?"

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

        if filename:

            msg = "%s@%s" % (filename, 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(None, _("data length off by %d bytes") % d[0], name)

        if d[1]:

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

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

        if n in seen:

            err(i, _("duplicates changeset at revision %d") % seen[n])

        seen[n] = i

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

            if p not in repo.changelog.nodemap:

                err(i, _("changeset has unknown parent %s") % short(p))

        try:

            changes = repo.changelog.read(n)

        except KeyboardInterrupt:

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

            raise

        except Exception, inst:

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

            continue

        if changes[0] not in neededmanifests:

            neededmanifests[changes[0]] = i

        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(None, _("bad link (%d) at manifest revision %d") % (l, i))

        if n in neededmanifests:

            del neededmanifests[n]

        if n in seen:

            err(l, _("duplicates manifest from %d") % seen[n])

        seen[n] = l

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

            if p not in repo.manifest.nodemap:

                err(l, _("manifest has unknown parent %s") % short(p))

        try:

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

                fns = filenodes.setdefault(f, {})

                if fn not in fns:

                    fns[fn] = n

        except KeyboardInterrupt:

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

            raise

        except Exception, inst:

            err(l, _("reading manifest delta: %s") % inst)

            continue

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

    nm = neededmanifests.items()

    nm.sort()

    for m, c in nm:

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

    del neededmanifests, nm

    for f in filenodes:

        if f not in filelinkrevs:

            lrs = [repo.manifest.linkrev(n) for n in filenodes[f]]

            lrs.sort()

            err(lrs[0], _("in manifest but not in changeset"), f)

    for f in filelinkrevs:

        if f not in filenodes:

            lr = filelinkrevs[f][0]

            err(lr, _("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:

            lr = repo.manifest.linkrev(filenodes[f][0])

            err(lr, _("file without name in manifest %s") % short(ff[n]))

            continue

        fl = repo.file(f)

        checkversion(fl, f)

        checksize(fl, f)

        seen = {}

        nodes = {nullid: 1}

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

            revisions += 1

            n = fl.node(i)

            flr = fl.linkrev(n)

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

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

                    err(None, _("rev %d point to nonexistent changeset %d")

                        % (i, flr), f)

                else:

                    err(None, _("rev %d points to unexpected changeset %d")

                        % (i, flr), f)

                if f in filelinkrevs:

                    warn(_(" (expected %s)") % filelinkrevs[f][0])

                flr = None # can't be trusted

            else:

                filelinkrevs[f].remove(flr)

            if n in seen:

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

            if n not in filenodes[f]:

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

            else:

                del filenodes[f][n]

            # verify contents

            try:

                t = fl.read(n)

            except KeyboardInterrupt:

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

                raise

            except Exception, inst:

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

            # verify parents

            try:

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

                if p1 not in nodes:

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

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

                if p2 not in nodes:

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

                            (short(p2), short(p1)), f)

            except KeyboardInterrupt:

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

                raise

            except Exception, inst:

                err(flr, _("checking parents of %s: %s") % (short(n), inst), f)

            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(flr, _("checking rename of %s: %s") %

                    (short(n), inst), f)

        # cross-check

        fns = [(repo.manifest.linkrev(filenodes[f][n]), n)

               for n in filenodes[f]]

        fns.sort()

        for lr, node in fns:

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

        if firstbad[0]:

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

                         % firstbad[0])

        return 1