comparison mercurial/wireprotov1server.py @ 43076:2372284d9457

formatting: blacken the codebase

This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.

Done with:

  hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S

# skip-blame mass-reformatting only

# no-check-commit reformats foo_bar functions

Differential Revision: https://phab.mercurial-scm.org/D6971

43075:57875cf423c9

urlerr = util.urlerr
urlreq = util.urlreq

bundle2requiredmain = _('incompatible Mercurial client; bundle2 required')
bundle2requiredhint = _('see https://www.mercurial-scm.org/wiki/'
                        'IncompatibleClient')
bundle2required = '%s\n(%s)\n' % (bundle2requiredmain, bundle2requiredhint)

def clientcompressionsupport(proto):
    """Returns a list of compression methods supported by the client.

    Returns a list of the compression methods supported by the client

    for cap in proto.getprotocaps():
        if cap.startswith('comp='):
            return cap[5:].split(',')
    return ['zlib', 'none']

# wire protocol command can either return a string or one of these classes.

def getdispatchrepo(repo, proto, command):
    """Obtain the repo used for processing wire protocol commands.

    The intent of this function is to serve as a monkeypatch point for

    specialized circumstances.
    """
    viewconfig = repo.ui.config('server', 'view')
    return repo.filtered(viewconfig)

def dispatch(repo, proto, command):
    repo = getdispatchrepo(repo, proto, command)

    func, spec = commands[command]
    args = proto.getargs(spec)

    return func(repo, proto, *args)

def options(cmd, keys, others):
    opts = {}
    for k in keys:
        if k in others:
            opts[k] = others[k]
            del others[k]
    if others:
        procutil.stderr.write("warning: %s ignored unexpected arguments %s\n"
                              % (cmd, ",".join(others)))
    return opts

def bundle1allowed(repo, action):
    """Whether a bundle1 operation is allowed from the server.

    Priority is:

        if v is not None:
            return v

    return ui.configbool('server', 'bundle1')

commands = wireprototypes.commanddict()

def wireprotocommand(name, args=None, permission='push'):
    """Decorator to declare a wire protocol command.

    ``name`` is the name of the wire protocol command being provided.

    Can be ``push`` or ``pull``. These roughly map to read-write and read-only,
    respectively. Default is to assume command requires ``push`` permissions
    because otherwise commands not declaring their permissions could modify
    a repository that is supposed to be read-only.
    """
    transports = {k for k, v in wireprototypes.TRANSPORTS.items()
                  if v['version'] == 1}

    # Because SSHv2 is a mirror of SSHv1, we allow "batch" commands through to
    # SSHv2.
    # TODO undo this hack when SSH is using the unified frame protocol.
    if name == b'batch':
        transports.add(wireprototypes.SSHV2)

    if permission not in ('push', 'pull'):
        raise error.ProgrammingError('invalid wire protocol permission; '
                                     'got %s; expected "push" or "pull"' %
                                     permission)

    if args is None:
        args = ''

    if not isinstance(args, bytes):
        raise error.ProgrammingError('arguments for version 1 commands '
                                     'must be declared as bytes')

    def register(func):
        if name in commands:
            raise error.ProgrammingError('%s command already registered '
                                         'for version 1' % name)
        commands[name] = wireprototypes.commandentry(
            func, args=args, transports=transports, permission=permission)

        return func
    return register

# TODO define a more appropriate permissions type to use for this.
@wireprotocommand('batch', 'cmds *', permission='pull')
def batch(repo, proto, cmds, others):
    unescapearg = wireprototypes.unescapebatcharg

            result = result.data
        res.append(wireprototypes.escapebatcharg(result))

    return wireprototypes.bytesresponse(';'.join(res))

@wireprotocommand('between', 'pairs', permission='pull')
def between(repo, proto, pairs):
    pairs = [wireprototypes.decodelist(p, '-') for p in pairs.split(" ")]
    r = []
    for b in repo.between(pairs):
        r.append(wireprototypes.encodelist(b) + "\n")

    return wireprototypes.bytesresponse(''.join(r))

@wireprotocommand('branchmap', permission='pull')
def branchmap(repo, proto):
    branchmap = repo.branchmap()
    heads = []

        branchnodes = wireprototypes.encodelist(nodes)
        heads.append('%s %s' % (branchname, branchnodes))

    return wireprototypes.bytesresponse('\n'.join(heads))

@wireprotocommand('branches', 'nodes', permission='pull')
def branches(repo, proto, nodes):
    nodes = wireprototypes.decodelist(nodes)
    r = []
    for b in repo.branches(nodes):
        r.append(wireprototypes.encodelist(b) + "\n")

    return wireprototypes.bytesresponse(''.join(r))

@wireprotocommand('clonebundles', '', permission='pull')
def clonebundles(repo, proto):
    """Server command for returning info for available bundles to seed clones.

    Clients will parse this response and determine what bundle to fetch.

    Extensions may wrap this command to filter or dynamically emit data
    depending on the request. e.g. you could advertise URLs for the closest
    data center given the client's IP address.
    """
    return wireprototypes.bytesresponse(
        repo.vfs.tryread('clonebundles.manifest'))

wireprotocaps = ['lookup', 'branchmap', 'pushkey',
                 'known', 'getbundle', 'unbundlehash']

def _capabilities(repo, proto):
    """return a list of capabilities for a repo

    This function exists to allow extensions to easily wrap capabilities

        if repo.ui.configbool('experimental', 'narrowservebrokenellipses'):
            caps.append(wireprototypes.ELLIPSESCAP)

    return proto.addcapabilities(repo, caps)

# If you are writing an extension and consider wrapping this function. Wrap
# `_capabilities` instead.
@wireprotocommand('capabilities', permission='pull')
def capabilities(repo, proto):
    caps = _capabilities(repo, proto)
    return wireprototypes.bytesresponse(' '.join(sorted(caps)))

@wireprotocommand('changegroup', 'roots', permission='pull')
def changegroup(repo, proto, roots):
    nodes = wireprototypes.decodelist(roots)
    outgoing = discovery.outgoing(repo, missingroots=nodes,
                                  missingheads=repo.heads())
    cg = changegroupmod.makechangegroup(repo, outgoing, '01', 'serve')
    gen = iter(lambda: cg.read(32768), '')
    return wireprototypes.streamres(gen=gen)

@wireprotocommand('changegroupsubset', 'bases heads',
                  permission='pull')
def changegroupsubset(repo, proto, bases, heads):
    bases = wireprototypes.decodelist(bases)
    heads = wireprototypes.decodelist(heads)
    outgoing = discovery.outgoing(repo, missingroots=bases,
                                  missingheads=heads)
    cg = changegroupmod.makechangegroup(repo, outgoing, '01', 'serve')
    gen = iter(lambda: cg.read(32768), '')
    return wireprototypes.streamres(gen=gen)

@wireprotocommand('debugwireargs', 'one two *',
                  permission='pull')
def debugwireargs(repo, proto, one, two, others):
    # only accept optional args from the known set
    opts = options('debugwireargs', ['three', 'four'], others)
    return wireprototypes.bytesresponse(repo.debugwireargs(
        one, two, **pycompat.strkwargs(opts)))

def find_pullbundle(repo, proto, opts, clheads, heads, common):
    """Return a file object for the first matching pullbundle.

    Pullbundles are specified in .hg/pullbundles.manifest similar to

    - At least one leaf of the bundle's DAG is missing on the client.
    - Every leaf of the bundle's DAG is part of node set the client wants.
      E.g. do not send a bundle of all changes if the client wants only
      one specific branch of many.
    """
    def decodehexstring(s):
        return {binascii.unhexlify(h) for h in s.split(';')}

    manifest = repo.vfs.tryread('pullbundles.manifest')
    if not manifest:

                bundle_heads = decodehexstring(entry['heads'])
            except TypeError:
                # Bad heads entry
                continue
            if bundle_heads.issubset(common):
                continue # Nothing new
            if all(cl.rev(rev) in common_anc for rev in bundle_heads):
                continue # Still nothing new
            if any(cl.rev(rev) not in heads_anc and
                   cl.rev(rev) not in common_anc for rev in bundle_heads):
                continue
        if 'bases' in entry:
            try:
                bundle_bases = decodehexstring(entry['bases'])
            except TypeError:

        except IOError:
            repo.ui.debug('pullbundle "%s" not accessible\n' % path)
            continue
    return None

@wireprotocommand('getbundle', '*', permission='pull')
def getbundle(repo, proto, others):
    opts = options('getbundle', wireprototypes.GETBUNDLE_ARGUMENTS.keys(),
                   others)
    for k, v in opts.iteritems():
        keytype = wireprototypes.GETBUNDLE_ARGUMENTS[k]
        if keytype == 'nodes':
            opts[k] = wireprototypes.decodelist(v)
        elif keytype == 'csv':

            if v == '0':
                opts[k] = False
            else:
                opts[k] = bool(v)
        elif keytype != 'plain':
            raise KeyError('unknown getbundle option type %s'
                           % keytype)

    if not bundle1allowed(repo, 'pull'):
        if not exchange.bundle2requested(opts.get('bundlecaps')):
            if proto.name == 'http-v1':
                return wireprototypes.ooberror(bundle2required)
            raise error.Abort(bundle2requiredmain,
                              hint=bundle2requiredhint)

    try:
        clheads = set(repo.changelog.heads())
        heads = set(opts.get('heads', set()))
        common = set(opts.get('common', set()))
        common.discard(nullid)
        if (repo.ui.configbool('server', 'pullbundle') and
            'partial-pull' in proto.getprotocaps()):
            # Check if a pre-built bundle covers this request.
            bundle = find_pullbundle(repo, proto, opts, clheads, heads, common)
            if bundle:
                return wireprototypes.streamres(gen=util.filechunkiter(bundle),
                                                prefer_uncompressed=True)

        if repo.ui.configbool('server', 'disablefullbundle'):
            # Check to see if this is a full clone.
            changegroup = opts.get('cg', True)
            if changegroup and not common and clheads == heads:
                raise error.Abort(
                    _('server has pull-based clones disabled'),
                    hint=_('remove --pull if specified or upgrade Mercurial'))

        info, chunks = exchange.getbundlechunks(repo, 'serve',
                                                **pycompat.strkwargs(opts))
        prefercompressed = info.get('prefercompressed', True)
    except error.Abort as exc:
        # cleanly forward Abort error to the client
        if not exchange.bundle2requested(opts.get('bundlecaps')):
            if proto.name == 'http-v1':
                return wireprototypes.ooberror(pycompat.bytestr(exc) + '\n')
            raise # cannot do better for bundle1 + ssh
        # bundle2 request expect a bundle2 reply
        bundler = bundle2.bundle20(repo.ui)
        manargs = [('message', pycompat.bytestr(exc))]
        advargs = []
        if exc.hint is not None:
            advargs.append(('hint', exc.hint))
        bundler.addpart(bundle2.bundlepart('error:abort',
                                           manargs, advargs))
        chunks = bundler.getchunks()
        prefercompressed = False

    return wireprototypes.streamres(
        gen=chunks, prefer_uncompressed=not prefercompressed)

@wireprotocommand('heads', permission='pull')
def heads(repo, proto):
    h = repo.heads()
    return wireprototypes.bytesresponse(wireprototypes.encodelist(h) + '\n')

@wireprotocommand('hello', permission='pull')
def hello(repo, proto):
    """Called as part of SSH handshake to obtain server info.

    Returns a list of lines describing interesting things about the

        capabilities: <token0> <token1> <token2>
    """
    caps = capabilities(repo, proto).data
    return wireprototypes.bytesresponse('capabilities: %s\n' % caps)

@wireprotocommand('listkeys', 'namespace', permission='pull')
def listkeys(repo, proto, namespace):
    d = sorted(repo.listkeys(encoding.tolocal(namespace)).items())
    return wireprototypes.bytesresponse(pushkeymod.encodekeys(d))

@wireprotocommand('lookup', 'key', permission='pull')
def lookup(repo, proto, key):
    try:
        k = encoding.tolocal(key)

    except Exception as inst:
        r = stringutil.forcebytestr(inst)
        success = 0
    return wireprototypes.bytesresponse('%d %s\n' % (success, r))

@wireprotocommand('known', 'nodes *', permission='pull')
def known(repo, proto, nodes, others):
    v = ''.join(b and '1' or '0'
                for b in repo.known(wireprototypes.decodelist(nodes)))
    return wireprototypes.bytesresponse(v)

@wireprotocommand('protocaps', 'caps', permission='pull')
def protocaps(repo, proto, caps):
    if proto.name == wireprototypes.SSHV1:
        proto._protocaps = set(caps.split(' '))
    return wireprototypes.bytesresponse('OK')

@wireprotocommand('pushkey', 'namespace key old new', permission='push')
def pushkey(repo, proto, namespace, key, old, new):
    # compatibility with pre-1.8 clients which were accidentally
    # sending raw binary nodes rather than utf-8-encoded hex
    if len(new) == 20 and stringutil.escapestr(new) != new:
        # looks like it could be a binary node
        try:
            new.decode('utf-8')
            new = encoding.tolocal(new) # but cleanly decodes as UTF-8
        except UnicodeDecodeError:
            pass # binary, leave unmodified
    else:
        new = encoding.tolocal(new) # normal path

    with proto.mayberedirectstdio() as output:
        r = repo.pushkey(encoding.tolocal(namespace), encoding.tolocal(key),
                         encoding.tolocal(old), new) or False

    output = output.getvalue() if output else ''
    return wireprototypes.bytesresponse('%d\n%s' % (int(r), output))

@wireprotocommand('stream_out', permission='pull')
def stream(repo, proto):
    '''If the server supports streaming clone, it advertises the "stream"
    capability with a value representing the version and flags of the repo
    it is serving. Client checks to see if it understands the format.
    '''
    return wireprototypes.streamreslegacy(
        streamclone.generatev1wireproto(repo))

@wireprotocommand('unbundle', 'heads', permission='push')
def unbundle(repo, proto, heads):
    their_heads = wireprototypes.decodelist(heads)

            exchange.check_heads(repo, their_heads, 'preparing changes')
            cleanup = lambda: None
            try:
                payload = proto.getpayload()
                if repo.ui.configbool('server', 'streamunbundle'):
                    def cleanup():
                        # Ensure that the full payload is consumed, so
                        # that the connection doesn't contain trailing garbage.
                        for p in payload:
                            pass
                    fp = util.chunkbuffer(payload)
                else:
                    # write bundle data to temporary file as it can be big
                    fp, tempname = None, None
                    def cleanup():
                        if fp:
                            fp.close()
                        if tempname:
                            os.unlink(tempname)
                    fd, tempname = pycompat.mkstemp(prefix='hg-unbundle-')
                    repo.ui.debug('redirecting incoming bundle to %s\n' %
                        tempname)
                    fp = os.fdopen(fd, pycompat.sysstr('wb+'))
                    for p in payload:
                        fp.write(p)
                    fp.seek(0)

                gen = exchange.readbundle(repo.ui, fp, None)
                if (isinstance(gen, changegroupmod.cg1unpacker)
                    and not bundle1allowed(repo, 'push')):
                    if proto.name == 'http-v1':
                        # need to special case http because stderr do not get to
                        # the http client on failed push so we need to abuse
                        # some other error type to make sure the message get to
                        # the user.
                        return wireprototypes.ooberror(bundle2required)
                    raise error.Abort(bundle2requiredmain,
                                      hint=bundle2requiredhint)

                r = exchange.unbundle(repo, gen, their_heads, 'serve',
                                      proto.client())
                if util.safehasattr(r, 'addpart'):
                    # The return looks streamable, we are in the bundle2 case
                    # and should return a stream.
                    return wireprototypes.streamreslegacy(gen=r.getchunks())
                return wireprototypes.pushres(
                    r, output.getvalue() if output else '')

            finally:
                cleanup()

        except (error.BundleValueError, error.Abort, error.PushRaced) as exc:

                    procutil.stderr.write("abort: %s\n" % exc)
                    if exc.hint is not None:
                        procutil.stderr.write("(%s)\n" % exc.hint)
                    procutil.stderr.flush()
                    return wireprototypes.pushres(
                        0, output.getvalue() if output else '')
                except error.PushRaced:
                    return wireprototypes.pusherr(
                        pycompat.bytestr(exc),
                        output.getvalue() if output else '')

            bundler = bundle2.bundle20(repo.ui)
            for out in getattr(exc, '_bundle2salvagedoutput', ()):
                bundler.addpart(out)
            try:
                try:
                    raise
                except error.PushkeyFailed as exc:
                    # check client caps
                    remotecaps = getattr(exc, '_replycaps', None)
                    if (remotecaps is not None
                            and 'pushkey' not in remotecaps.get('error', ())):
                        # no support remote side, fallback to Abort handler.
                        raise
                    part = bundler.newpart('error:pushkey')
                    part.addparam('in-reply-to', exc.partid)
                    if exc.namespace is not None:
                        part.addparam('namespace', exc.namespace,
                                      mandatory=False)
                    if exc.key is not None:
                        part.addparam('key', exc.key, mandatory=False)
                    if exc.new is not None:
                        part.addparam('new', exc.new, mandatory=False)
                    if exc.old is not None:

            except error.Abort as exc:
                manargs = [('message', stringutil.forcebytestr(exc))]
                advargs = []
                if exc.hint is not None:
                    advargs.append(('hint', exc.hint))
                bundler.addpart(bundle2.bundlepart('error:abort',
                                                   manargs, advargs))
            except error.PushRaced as exc:
                bundler.newpart('error:pushraced',
                                [('message', stringutil.forcebytestr(exc))])
            return wireprototypes.streamreslegacy(gen=bundler.getchunks())

43076:2372284d9457

urlerr = util.urlerr
urlreq = util.urlreq

bundle2requiredmain = _('incompatible Mercurial client; bundle2 required')
bundle2requiredhint = _(
    'see https://www.mercurial-scm.org/wiki/' 'IncompatibleClient'
)
bundle2required = '%s\n(%s)\n' % (bundle2requiredmain, bundle2requiredhint)


def clientcompressionsupport(proto):
    """Returns a list of compression methods supported by the client.

    Returns a list of the compression methods supported by the client

    for cap in proto.getprotocaps():
        if cap.startswith('comp='):
            return cap[5:].split(',')
    return ['zlib', 'none']


# wire protocol command can either return a string or one of these classes.


def getdispatchrepo(repo, proto, command):
    """Obtain the repo used for processing wire protocol commands.

    The intent of this function is to serve as a monkeypatch point for

    specialized circumstances.
    """
    viewconfig = repo.ui.config('server', 'view')
    return repo.filtered(viewconfig)


def dispatch(repo, proto, command):
    repo = getdispatchrepo(repo, proto, command)

    func, spec = commands[command]
    args = proto.getargs(spec)

    return func(repo, proto, *args)


def options(cmd, keys, others):
    opts = {}
    for k in keys:
        if k in others:
            opts[k] = others[k]
            del others[k]
    if others:
        procutil.stderr.write(
            "warning: %s ignored unexpected arguments %s\n"
            % (cmd, ",".join(others))
        )
    return opts


def bundle1allowed(repo, action):
    """Whether a bundle1 operation is allowed from the server.

    Priority is:

        if v is not None:
            return v

    return ui.configbool('server', 'bundle1')


commands = wireprototypes.commanddict()


def wireprotocommand(name, args=None, permission='push'):
    """Decorator to declare a wire protocol command.

    ``name`` is the name of the wire protocol command being provided.

    Can be ``push`` or ``pull``. These roughly map to read-write and read-only,
    respectively. Default is to assume command requires ``push`` permissions
    because otherwise commands not declaring their permissions could modify
    a repository that is supposed to be read-only.
    """
    transports = {
        k for k, v in wireprototypes.TRANSPORTS.items() if v['version'] == 1
    }

    # Because SSHv2 is a mirror of SSHv1, we allow "batch" commands through to
    # SSHv2.
    # TODO undo this hack when SSH is using the unified frame protocol.
    if name == b'batch':
        transports.add(wireprototypes.SSHV2)

    if permission not in ('push', 'pull'):
        raise error.ProgrammingError(
            'invalid wire protocol permission; '
            'got %s; expected "push" or "pull"' % permission
        )

    if args is None:
        args = ''

    if not isinstance(args, bytes):
        raise error.ProgrammingError(
            'arguments for version 1 commands ' 'must be declared as bytes'
        )

    def register(func):
        if name in commands:
            raise error.ProgrammingError(
                '%s command already registered ' 'for version 1' % name
            )
        commands[name] = wireprototypes.commandentry(
            func, args=args, transports=transports, permission=permission
        )

        return func

    return register


# TODO define a more appropriate permissions type to use for this.
@wireprotocommand('batch', 'cmds *', permission='pull')
def batch(repo, proto, cmds, others):
    unescapearg = wireprototypes.unescapebatcharg

            result = result.data
        res.append(wireprototypes.escapebatcharg(result))

    return wireprototypes.bytesresponse(';'.join(res))


@wireprotocommand('between', 'pairs', permission='pull')
def between(repo, proto, pairs):
    pairs = [wireprototypes.decodelist(p, '-') for p in pairs.split(" ")]
    r = []
    for b in repo.between(pairs):
        r.append(wireprototypes.encodelist(b) + "\n")

    return wireprototypes.bytesresponse(''.join(r))


@wireprotocommand('branchmap', permission='pull')
def branchmap(repo, proto):
    branchmap = repo.branchmap()
    heads = []

        branchnodes = wireprototypes.encodelist(nodes)
        heads.append('%s %s' % (branchname, branchnodes))

    return wireprototypes.bytesresponse('\n'.join(heads))


@wireprotocommand('branches', 'nodes', permission='pull')
def branches(repo, proto, nodes):
    nodes = wireprototypes.decodelist(nodes)
    r = []
    for b in repo.branches(nodes):
        r.append(wireprototypes.encodelist(b) + "\n")

    return wireprototypes.bytesresponse(''.join(r))


@wireprotocommand('clonebundles', '', permission='pull')
def clonebundles(repo, proto):
    """Server command for returning info for available bundles to seed clones.

    Clients will parse this response and determine what bundle to fetch.

    Extensions may wrap this command to filter or dynamically emit data
    depending on the request. e.g. you could advertise URLs for the closest
    data center given the client's IP address.
    """
    return wireprototypes.bytesresponse(
        repo.vfs.tryread('clonebundles.manifest')
    )


wireprotocaps = [
    'lookup',
    'branchmap',
    'pushkey',
    'known',
    'getbundle',
    'unbundlehash',
]


def _capabilities(repo, proto):
    """return a list of capabilities for a repo

    This function exists to allow extensions to easily wrap capabilities

        if repo.ui.configbool('experimental', 'narrowservebrokenellipses'):
            caps.append(wireprototypes.ELLIPSESCAP)

    return proto.addcapabilities(repo, caps)


# If you are writing an extension and consider wrapping this function. Wrap
# `_capabilities` instead.
@wireprotocommand('capabilities', permission='pull')
def capabilities(repo, proto):
    caps = _capabilities(repo, proto)
    return wireprototypes.bytesresponse(' '.join(sorted(caps)))


@wireprotocommand('changegroup', 'roots', permission='pull')
def changegroup(repo, proto, roots):
    nodes = wireprototypes.decodelist(roots)
    outgoing = discovery.outgoing(
        repo, missingroots=nodes, missingheads=repo.heads()
    )
    cg = changegroupmod.makechangegroup(repo, outgoing, '01', 'serve')
    gen = iter(lambda: cg.read(32768), '')
    return wireprototypes.streamres(gen=gen)


@wireprotocommand('changegroupsubset', 'bases heads', permission='pull')
def changegroupsubset(repo, proto, bases, heads):
    bases = wireprototypes.decodelist(bases)
    heads = wireprototypes.decodelist(heads)
    outgoing = discovery.outgoing(repo, missingroots=bases, missingheads=heads)
    cg = changegroupmod.makechangegroup(repo, outgoing, '01', 'serve')
    gen = iter(lambda: cg.read(32768), '')
    return wireprototypes.streamres(gen=gen)


@wireprotocommand('debugwireargs', 'one two *', permission='pull')
def debugwireargs(repo, proto, one, two, others):
    # only accept optional args from the known set
    opts = options('debugwireargs', ['three', 'four'], others)
    return wireprototypes.bytesresponse(
        repo.debugwireargs(one, two, **pycompat.strkwargs(opts))
    )


def find_pullbundle(repo, proto, opts, clheads, heads, common):
    """Return a file object for the first matching pullbundle.

    Pullbundles are specified in .hg/pullbundles.manifest similar to

    - At least one leaf of the bundle's DAG is missing on the client.
    - Every leaf of the bundle's DAG is part of node set the client wants.
      E.g. do not send a bundle of all changes if the client wants only
      one specific branch of many.
    """

    def decodehexstring(s):
        return {binascii.unhexlify(h) for h in s.split(';')}

    manifest = repo.vfs.tryread('pullbundles.manifest')
    if not manifest:

                bundle_heads = decodehexstring(entry['heads'])
            except TypeError:
                # Bad heads entry
                continue
            if bundle_heads.issubset(common):
                continue  # Nothing new
            if all(cl.rev(rev) in common_anc for rev in bundle_heads):
                continue  # Still nothing new
            if any(
                cl.rev(rev) not in heads_anc and cl.rev(rev) not in common_anc
                for rev in bundle_heads
            ):
                continue
        if 'bases' in entry:
            try:
                bundle_bases = decodehexstring(entry['bases'])
            except TypeError:

        except IOError:
            repo.ui.debug('pullbundle "%s" not accessible\n' % path)
            continue
    return None


@wireprotocommand('getbundle', '*', permission='pull')
def getbundle(repo, proto, others):
    opts = options(
        'getbundle', wireprototypes.GETBUNDLE_ARGUMENTS.keys(), others
    )
    for k, v in opts.iteritems():
        keytype = wireprototypes.GETBUNDLE_ARGUMENTS[k]
        if keytype == 'nodes':
            opts[k] = wireprototypes.decodelist(v)
        elif keytype == 'csv':

            if v == '0':
                opts[k] = False
            else:
                opts[k] = bool(v)
        elif keytype != 'plain':
            raise KeyError('unknown getbundle option type %s' % keytype)

    if not bundle1allowed(repo, 'pull'):
        if not exchange.bundle2requested(opts.get('bundlecaps')):
            if proto.name == 'http-v1':
                return wireprototypes.ooberror(bundle2required)
            raise error.Abort(bundle2requiredmain, hint=bundle2requiredhint)

    try:
        clheads = set(repo.changelog.heads())
        heads = set(opts.get('heads', set()))
        common = set(opts.get('common', set()))
        common.discard(nullid)
        if (
            repo.ui.configbool('server', 'pullbundle')
            and 'partial-pull' in proto.getprotocaps()
        ):
            # Check if a pre-built bundle covers this request.
            bundle = find_pullbundle(repo, proto, opts, clheads, heads, common)
            if bundle:
                return wireprototypes.streamres(
                    gen=util.filechunkiter(bundle), prefer_uncompressed=True
                )

        if repo.ui.configbool('server', 'disablefullbundle'):
            # Check to see if this is a full clone.
            changegroup = opts.get('cg', True)
            if changegroup and not common and clheads == heads:
                raise error.Abort(
                    _('server has pull-based clones disabled'),
                    hint=_('remove --pull if specified or upgrade Mercurial'),
                )

        info, chunks = exchange.getbundlechunks(
            repo, 'serve', **pycompat.strkwargs(opts)
        )
        prefercompressed = info.get('prefercompressed', True)
    except error.Abort as exc:
        # cleanly forward Abort error to the client
        if not exchange.bundle2requested(opts.get('bundlecaps')):
            if proto.name == 'http-v1':
                return wireprototypes.ooberror(pycompat.bytestr(exc) + '\n')
            raise  # cannot do better for bundle1 + ssh
        # bundle2 request expect a bundle2 reply
        bundler = bundle2.bundle20(repo.ui)
        manargs = [('message', pycompat.bytestr(exc))]
        advargs = []
        if exc.hint is not None:
            advargs.append(('hint', exc.hint))
        bundler.addpart(bundle2.bundlepart('error:abort', manargs, advargs))
        chunks = bundler.getchunks()
        prefercompressed = False

    return wireprototypes.streamres(
        gen=chunks, prefer_uncompressed=not prefercompressed
    )


@wireprotocommand('heads', permission='pull')
def heads(repo, proto):
    h = repo.heads()
    return wireprototypes.bytesresponse(wireprototypes.encodelist(h) + '\n')


@wireprotocommand('hello', permission='pull')
def hello(repo, proto):
    """Called as part of SSH handshake to obtain server info.

    Returns a list of lines describing interesting things about the

        capabilities: <token0> <token1> <token2>
    """
    caps = capabilities(repo, proto).data
    return wireprototypes.bytesresponse('capabilities: %s\n' % caps)


@wireprotocommand('listkeys', 'namespace', permission='pull')
def listkeys(repo, proto, namespace):
    d = sorted(repo.listkeys(encoding.tolocal(namespace)).items())
    return wireprototypes.bytesresponse(pushkeymod.encodekeys(d))


@wireprotocommand('lookup', 'key', permission='pull')
def lookup(repo, proto, key):
    try:
        k = encoding.tolocal(key)

    except Exception as inst:
        r = stringutil.forcebytestr(inst)
        success = 0
    return wireprototypes.bytesresponse('%d %s\n' % (success, r))


@wireprotocommand('known', 'nodes *', permission='pull')
def known(repo, proto, nodes, others):
    v = ''.join(
        b and '1' or '0' for b in repo.known(wireprototypes.decodelist(nodes))
    )
    return wireprototypes.bytesresponse(v)


@wireprotocommand('protocaps', 'caps', permission='pull')
def protocaps(repo, proto, caps):
    if proto.name == wireprototypes.SSHV1:
        proto._protocaps = set(caps.split(' '))
    return wireprototypes.bytesresponse('OK')


@wireprotocommand('pushkey', 'namespace key old new', permission='push')
def pushkey(repo, proto, namespace, key, old, new):
    # compatibility with pre-1.8 clients which were accidentally
    # sending raw binary nodes rather than utf-8-encoded hex
    if len(new) == 20 and stringutil.escapestr(new) != new:
        # looks like it could be a binary node
        try:
            new.decode('utf-8')
            new = encoding.tolocal(new)  # but cleanly decodes as UTF-8
        except UnicodeDecodeError:
            pass  # binary, leave unmodified
    else:
        new = encoding.tolocal(new)  # normal path

    with proto.mayberedirectstdio() as output:
        r = (
            repo.pushkey(
                encoding.tolocal(namespace),
                encoding.tolocal(key),
                encoding.tolocal(old),
                new,
            )
            or False
        )

    output = output.getvalue() if output else ''
    return wireprototypes.bytesresponse('%d\n%s' % (int(r), output))


@wireprotocommand('stream_out', permission='pull')
def stream(repo, proto):
    '''If the server supports streaming clone, it advertises the "stream"
    capability with a value representing the version and flags of the repo
    it is serving. Client checks to see if it understands the format.
    '''
    return wireprototypes.streamreslegacy(streamclone.generatev1wireproto(repo))


@wireprotocommand('unbundle', 'heads', permission='push')
def unbundle(repo, proto, heads):
    their_heads = wireprototypes.decodelist(heads)

            exchange.check_heads(repo, their_heads, 'preparing changes')
            cleanup = lambda: None
            try:
                payload = proto.getpayload()
                if repo.ui.configbool('server', 'streamunbundle'):

                    def cleanup():
                        # Ensure that the full payload is consumed, so
                        # that the connection doesn't contain trailing garbage.
                        for p in payload:
                            pass

                    fp = util.chunkbuffer(payload)
                else:
                    # write bundle data to temporary file as it can be big
                    fp, tempname = None, None

                    def cleanup():
                        if fp:
                            fp.close()
                        if tempname:
                            os.unlink(tempname)

                    fd, tempname = pycompat.mkstemp(prefix='hg-unbundle-')
                    repo.ui.debug(
                        'redirecting incoming bundle to %s\n' % tempname
                    )
                    fp = os.fdopen(fd, pycompat.sysstr('wb+'))
                    for p in payload:
                        fp.write(p)
                    fp.seek(0)

                gen = exchange.readbundle(repo.ui, fp, None)
                if isinstance(
                    gen, changegroupmod.cg1unpacker
                ) and not bundle1allowed(repo, 'push'):
                    if proto.name == 'http-v1':
                        # need to special case http because stderr do not get to
                        # the http client on failed push so we need to abuse
                        # some other error type to make sure the message get to
                        # the user.
                        return wireprototypes.ooberror(bundle2required)
                    raise error.Abort(
                        bundle2requiredmain, hint=bundle2requiredhint
                    )

                r = exchange.unbundle(
                    repo, gen, their_heads, 'serve', proto.client()
                )
                if util.safehasattr(r, 'addpart'):
                    # The return looks streamable, we are in the bundle2 case
                    # and should return a stream.
                    return wireprototypes.streamreslegacy(gen=r.getchunks())
                return wireprototypes.pushres(
                    r, output.getvalue() if output else ''
                )

            finally:
                cleanup()

        except (error.BundleValueError, error.Abort, error.PushRaced) as exc:

                    procutil.stderr.write("abort: %s\n" % exc)
                    if exc.hint is not None:
                        procutil.stderr.write("(%s)\n" % exc.hint)
                    procutil.stderr.flush()
                    return wireprototypes.pushres(
                        0, output.getvalue() if output else ''
                    )
                except error.PushRaced:
                    return wireprototypes.pusherr(
                        pycompat.bytestr(exc),
                        output.getvalue() if output else '',
                    )

            bundler = bundle2.bundle20(repo.ui)
            for out in getattr(exc, '_bundle2salvagedoutput', ()):
                bundler.addpart(out)
            try:
                try:
                    raise
                except error.PushkeyFailed as exc:
                    # check client caps
                    remotecaps = getattr(exc, '_replycaps', None)
                    if (
                        remotecaps is not None
                        and 'pushkey' not in remotecaps.get('error', ())
                    ):
                        # no support remote side, fallback to Abort handler.
                        raise
                    part = bundler.newpart('error:pushkey')
                    part.addparam('in-reply-to', exc.partid)
                    if exc.namespace is not None:
                        part.addparam(
                            'namespace', exc.namespace, mandatory=False
                        )
                    if exc.key is not None:
                        part.addparam('key', exc.key, mandatory=False)
                    if exc.new is not None:
                        part.addparam('new', exc.new, mandatory=False)
                    if exc.old is not None:

            except error.Abort as exc:
                manargs = [('message', stringutil.forcebytestr(exc))]
                advargs = []
                if exc.hint is not None:
                    advargs.append(('hint', exc.hint))
                bundler.addpart(
                    bundle2.bundlepart('error:abort', manargs, advargs)
                )
            except error.PushRaced as exc:
                bundler.newpart(
                    'error:pushraced',
                    [('message', stringutil.forcebytestr(exc))],
                )
            return wireprototypes.streamreslegacy(gen=bundler.getchunks())