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# verify.py - repository integrity checking for Mercurial
#
# Copyright 2006, 2007 Matt Mackall <[e-mail]>
#
# 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 verifier(repo).verify()
    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 _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 verify(self):
        repo = self.repo
        mflinkrevs = {}
        filelinkrevs = {}
        filenodes = {}
        revisions = 0
        badrevs = self.badrevs
        ui = repo.ui
        cl = repo.changelog
        mf = repo.manifest
        lrugetctx = self.lrugetctx

        if not repo.url().startswith('file:'):
            raise error.Abort(_("cannot verify bundle or remote repos"))

        def checklog(obj, name, linkrev):
            if not len(obj) and (havecl or 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 revlogv1:
                    self.warn(_("warning: `%s' uses revlog format 1") % name)
            elif revlogv1:
                self.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")
                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 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

        if os.path.exists(repo.sjoin("journal")):
            ui.warn(_("abandoned transaction found - run hg recover\n"))

        revlogv1 = self.revlogv1
        if ui.verbose or not revlogv1:
            ui.status(_("repository uses revlog format %d\n") %
                           (revlogv1 and 1 or 0))

        havecl = self.havecl
        havemf = self.havemf

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

        ui.status(_("checking manifests\n"))
        seen = {}
        if self.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:
                self.err(lr, _("%s not in changesets") % short(n), "manifest")

            try:
                for f, fn in mf.readdelta(n).iteritems():
                    if not f:
                        self.err(lr, _("file without name in manifest"))
                    elif f != "/dev/null": # ignore this in very old repos
                        if _validpath(repo, f):
                            filenodes.setdefault(
                                _normpath(f), {}).setdefault(fn, lr)
            except Exception as inst:
                self.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)
                self.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]
                    self.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
                    self.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:
                self.err(None, _("cannot decode filename '%s'") % f2)
            elif size > 0 or not revlogv1:
                storefiles.add(_normpath(f))

        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:
                self.err(lr, _("broken revlog! (%s)") % e, f)
                continue

            for ff in fl.files():
                try:
                    storefiles.remove(ff)
                except KeyError:
                    self.warn(_(" warning: revlog '%s' not in fncache!") % ff)
                    self.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]:
                        self.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):
                            self.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":
                        self.err(lr, _("censored file data"), f)
                except Exception as inst:
                    self.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:
                                self.warn(_("warning: copy source of '%s' not"
                                            " in parents of %s") % (f, ctx))
                        fl2 = repo.file(rp[0])
                        if not len(fl2):
                            self.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:
                    self.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):
                    self.err(lr, _("%s in manifests not found") % short(node),
                             f)
        ui.progress(_('checking'), None)

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

        ui.status(_("%d files, %d changesets, %d total revisions\n") %
                       (len(files), len(cl), revisions))
        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 badrevs:
                ui.warn(_("(first damaged changeset appears to be %d)\n")
                        % min(badrevs))
            return 1