# 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 nullid, short

from i18n import _

import revlog, util, error

def verify(repo):

    lock = repo.lock()

    try:

        return _verify(repo)

    finally:

        lock.release()

def _verify(repo):

    mflinkrevs = {}

    filelinkrevs = {}

    filenodes = {}

    revisions = 0

    badrevs = {}

    errors = [0]

    warnings = [0]

    ui = repo.ui

    cl = repo.changelog

    mf = repo.manifest

    if not repo.cancopy():

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

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

        if linkrev != None:

            badrevs[linkrev] = True

        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

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

    def warn(msg):

        ui.warn(msg + "\n")

        warnings[0] += 1

    def checklog(obj, name):

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

            err(0, _("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:

                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(n)), f)

            if p2 not in seen and p2 != nullid:

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

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

        except Exception, inst:

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

        if node in seen:

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

        seen[n] = i

        return lr

    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"))

    seen = {}

    checklog(cl, "changelog")

    for i in repo:

        n = cl.node(i)

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

        try:

            changes = cl.read(n)

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

            for f in changes[3]:

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

        except Exception, inst:

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

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

    seen = {}

    checklog(mf, "manifest")

    for i in mf:

        n = mf.node(i)

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

        if n in mflinkrevs:

            del mflinkrevs[n]

        try:

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

                if not f:

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

                elif f != "/dev/null":

                    fns = filenodes.setdefault(f, {})

                    if fn not in fns:

                        fns[fn] = i

        except Exception, inst:

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

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

    if havemf:

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

        del mflinkrevs

            if f not in filenodes:

                lr = filelinkrevs[f][0]

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

    if havecl:

            if f not in filelinkrevs:

                try:

                    fl = repo.file(f)

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

                except:

                    lr = None

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

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

    storefiles = {}

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

        if not f:

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

        elif size > 0:

            storefiles[f] = True

    for f in files:

        lr = filelinkrevs[f][0]

        try:

            fl = repo.file(f)

        except error.RevlogError, e:

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

            continue

        for ff in fl.files():

            try:

                del storefiles[ff]

            except KeyError:

                err(lr, _("missing revlog!"), ff)

        checklog(fl, f)

        seen = {}

        for i in fl:

            revisions += 1

            n = fl.node(i)

            lr = checkentry(fl, i, n, seen, filelinkrevs.get(f, []), 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:

                t = fl.read(n)

                rp = fl.renamed(n)

                if len(t) != fl.size(i):

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

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

                            (len(t), fl.size(i)), f)

            except Exception, inst:

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

            # check renames

            try:

                if rp:

                    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:

                        warn(_("warning: %s@%s: copy source revision is nullid %s:%s")

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

                    else:

                        fl2.rev(rp[1])

            except Exception, inst:

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

        # cross-check

        if f in filenodes:

            fns = [(mf.linkrev(l), n) for n,l in filenodes[f].iteritems()]

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

    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 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