sapling/mercurial/dispatch.py

# dispatch.py - command dispatching for mercurial
#
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
#
# 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 difflib
import errno
import getopt
import os
import pdb
import re
import signal
import sys
import time
import traceback

from . import (
    cmdutil,
    color,
    commands,
    demandimport,
    encoding,
    error,
    extensions,
    fancyopts,
    help,
    hg,
    hintutil,
    hook,
    i18n,
    profiling,
    pycompat,
    registrar,
    scmutil,
    ui as uimod,
    util,
)
from .i18n import _


unrecoverablewrite = registrar.command.unrecoverablewrite
_entrypoint = None  # record who calls "run"


class request(object):
    def __init__(
        self,
        args,
        ui=None,
        repo=None,
        fin=None,
        fout=None,
        ferr=None,
        prereposetups=None,
    ):
        self.args = args
        self.ui = ui
        self.repo = repo

        # input/output/error streams
        self.fin = fin
        self.fout = fout
        self.ferr = ferr

        # remember options pre-parsed by _earlyparseopts()
        self.earlyoptions = {}

        # reposetups which run before extensions, useful for chg to pre-fill
        # low-level repo state (for example, changelog) before extensions.
        self.prereposetups = prereposetups or []

    def _runexithandlers(self):
        exc = None
        handlers = self.ui._exithandlers
        try:
            while handlers:
                func, args, kwargs = handlers.pop()
                try:
                    func(*args, **kwargs)
                except:  # re-raises below
                    if exc is None:
                        exc = sys.exc_info()[1]
                    self.ui.warn(("error in exit handlers:\n"))
                    self.ui.traceback(force=True)
        finally:
            if exc is not None:
                raise exc


def run(entrypoint="hg"):
    "run the command in sys.argv"
    global _entrypoint
    _entrypoint = entrypoint
    _initstdio()
    req = request(pycompat.sysargv[1:])
    err = None
    try:
        status = (dispatch(req) or 0) & 255
    except error.StdioError as e:
        err = e
        status = -1
    if util.safehasattr(req.ui, "fout"):
        try:
            req.ui.fout.flush()
        except IOError as e:
            err = e
            status = -1
    if util.safehasattr(req.ui, "ferr"):
        if err is not None and err.errno != errno.EPIPE:
            req.ui.ferr.write("abort: %s\n" % encoding.strtolocal(err.strerror))
        req.ui.ferr.flush()
    sys.exit(status & 255)


def _preimportmodules():
    """pre-import modules that are side-effect free (used by chg server)"""
    coremods = [
        "ancestor",
        "archival",
        "bookmarks",
        "branchmap",
        "bundle2",
        "bundlerepo",
        "byterange",
        "changegroup",
        "changelog",
        "color",
        "config",
        "configitems",
        "connectionpool",
        "context",
        "copies",
        "crecord",
        "dagop",
        "dagparser",
        "dagutil",
        "debugcommands",
        "destutil",
        "dirstate",
        "dirstateguard",
        "discovery",
        "exchange",
        "filelog",
        "filemerge",
        "fileset",
        "formatter",
        "graphmod",
        "hbisect",
        "httpclient",
        "httpconnection",
        "httppeer",
        "localrepo",
        "lock",
        "logexchange",
        "mail",
        "manifest",
        "match",
        "mdiff",
        "merge",
        "mergeutil",
        "minirst",
        "namespaces",
        "node",
        "obsolete",
        "obsutil",
        "parser",
        "patch",
        "pathutil",
        "peer",
        "phases",
        "policy",
        "progress",
        "pushkey",
        "rcutil",
        "repository",
        "repoview",
        "revlog",
        "revset",
        "revsetlang",
        "rewriteutil",
        "rust",
        "scmposix",
        "scmutil",
        "server",
        "setdiscovery",
        "similar",
        "simplemerge",
        "smartset",
        "sshpeer",
        "sshserver",
        "sslutil",
        "store",
        "streamclone",
        "subrepo",
        "tags",
        "templatefilters",
        "templatekw",
        "templater",
        "transaction",
        "treediscovery",
        "txnutil",
        "url",
        "urllibcompat",
        "vfs",
        "wireproto",
        "worker",
        "__version__",
    ]
    extmods = [
        "absorb",
        "age",
        "arcdiff",
        "automv",
        "blackbox",
        "checkmessagehook",
        "chistedit",
        "clienttelemetry",
        "clindex",
        "configwarn",
        "conflictinfo",
        "convert",
        "copytrace",
        "crdump",
        "debugcommitmessage",
        "debugshell",
        "dialect",
        "directaccess",
        "dirsync",
        "extlib",
        "extorder",
        "extutil",
        "fastannotate",
        "fastlog",
        "fastmanifest",
        "fbamend",
        "fbconduit",
        "fbhistedit",
        "fbshow",
        "fbsparse",
        "fixcorrupt",
        "fsmonitor",
        "githelp",
        "gitlookup",
        "grpcheck",
        "hgevents",
        "hgsubversion",
        "hiddenerror",
        "histedit",
        "infinitepush",
        "inhibit",
        "journal",
        "lfs",
        "logginghelper",
        "lz4revlog",
        "mergedriver",
        "morecolors",
        "morestatus",
        "obsshelve",
        "pager",
        "patchbomb",
        "patchrmdir",
        "perftweaks",
        "phabdiff",
        "phabstatus",
        "phrevset",
        "progressfile",
        "pullcreatemarkers",
        "purge",
        "pushrebase",
        "rage",
        "rebase",
        "record",
        "remotefilelog",
        "remotenames",
        "reset",
        "sampling",
        "schemes",
        "share",
        "shareutil",
        "sigtrace",
        "simplecache",
        "smartlog",
        "sshaskpass",
        "stat",
        "strip",
        "traceprof",
        "treedirstate",
        "treemanifest",
        "tweakdefaults",
        "undo",
    ]
    for name in coremods:
        __import__("mercurial.%s" % name)
    for extname in extmods:
        extensions.preimport(extname)


def runchgserver():
    """start the chg server, pre-import bundled extensions"""
    # Clean server - do not load any config files or repos.
    _initstdio()
    ui = uimod.ui()
    repo = None
    args = sys.argv[1:]
    cmd, func, args, globalopts, cmdopts = _parse(ui, args)
    if not (cmd == "serve" and cmdopts["cmdserver"] == "chgunix"):
        raise error.ProgrammingError("runchgserver called without chg command")
    from . import chgserver, server

    _preimportmodules()
    service = chgserver.chgunixservice(ui, repo, cmdopts)
    server.runservice(cmdopts, initfn=service.init, runfn=service.run)


def getentrypoint():
    global _entrypoint
    return _entrypoint


def _initstdio():
    for fp in (sys.stdin, sys.stdout, sys.stderr):
        util.setbinary(fp)


def _getsimilar(symbols, value):
    sim = lambda x: difflib.SequenceMatcher(None, value, x).ratio()
    # The cutoff for similarity here is pretty arbitrary. It should
    # probably be investigated and tweaked.
    return [s for s in symbols if sim(s) > 0.6]


def _reportsimilar(write, similar):
    if len(similar) == 1:
        write(_("(did you mean %s?)\n") % similar[0])
    elif similar:
        ss = ", ".join(sorted(similar))
        write(_("(did you mean one of %s?)\n") % ss)


def _formatparse(write, inst):
    similar = []
    if isinstance(inst, error.UnknownIdentifier):
        # make sure to check fileset first, as revset can invoke fileset
        similar = _getsimilar(inst.symbols, inst.function)
    if len(inst.args) > 1:
        write(_("hg: parse error at %s: %s\n") % (inst.args[1], inst.args[0]))
        if inst.args[0][0] == " ":
            write(_("unexpected leading whitespace\n"))
    else:
        write(_("hg: parse error: %s\n") % inst.args[0])
        _reportsimilar(write, similar)
    if inst.hint:
        write(_("(%s)\n") % inst.hint)


def _formatargs(args):
    return " ".join(util.shellquote(a) for a in args)


def dispatch(req):
    "run the command specified in req.args"
    if req.ferr:
        ferr = req.ferr
    elif req.ui:
        ferr = req.ui.ferr
    else:
        ferr = util.stderr

    try:
        if not req.ui:
            req.ui = uimod.ui.load()
        req.earlyoptions.update(_earlyparseopts(req.ui, req.args))
        if req.earlyoptions["traceback"]:
            req.ui.setconfig("ui", "traceback", "on", "--traceback")

        # set ui streams from the request
        if req.fin:
            req.ui.fin = req.fin
        if req.fout:
            req.ui.fout = req.fout
        if req.ferr:
            req.ui.ferr = req.ferr
    except error.Abort as inst:
        ferr.write(_("abort: %s\n") % inst)
        if inst.hint:
            ferr.write(_("(%s)\n") % inst.hint)
        return -1
    except error.ParseError as inst:
        _formatparse(ferr.write, inst)
        return -1

    msg = _formatargs(req.args)
    starttime = util.timer()
    ret = None
    try:

        def measuredtimeslogger():
            req.ui.log(
                "measuredtimes",
                "measured times",
                **pycompat.strkwargs(req.ui._measuredtimes)
            )

        if req.ui.logmeasuredtimes:
            # by registering this exit handler here, we guarantee that it runs
            # after other exithandlers, like the killpager one
            req.ui.atexit(measuredtimeslogger)

        ret = _runcatch(req)
    except error.ProgrammingError as inst:
        req.ui.warn(_("** ProgrammingError: %s\n") % inst)
        if inst.hint:
            req.ui.warn(_("** (%s)\n") % inst.hint)
        raise
    except KeyboardInterrupt as inst:
        try:
            if isinstance(inst, error.SignalInterrupt):
                msg = _("killed!\n")
            else:
                msg = _("interrupted!\n")
            req.ui.warn(msg)
        except error.SignalInterrupt:
            # maybe pager would quit without consuming all the output, and
            # SIGPIPE was raised. we cannot print anything in this case.
            pass
        except IOError as inst:
            if inst.errno != errno.EPIPE:
                raise
        ret = -1
    finally:
        duration = util.timer() - starttime
        req.ui.flush()
        req.ui.log(
            "commandfinish",
            "%s exited %d after %0.2f seconds\n",
            msg,
            ret or 0,
            duration,
        )
        req.ui._measuredtimes["command_duration"] = duration * 1000

        try:
            req._runexithandlers()
        except:  # exiting, so no re-raises
            ret = ret or -1
    return ret


def _runcatch(req):
    def catchterm(*args):
        raise error.SignalInterrupt

    ui = req.ui
    try:
        for name in "SIGBREAK", "SIGHUP", "SIGTERM":
            num = getattr(signal, name, None)
            if num:
                signal.signal(num, catchterm)
    except ValueError:
        pass  # happens if called in a thread

    def _runcatchfunc():
        realcmd = None
        try:
            cmdargs = fancyopts.fancyopts(req.args[:], commands.globalopts, {})
            cmd = cmdargs[0]
            aliases, entry = cmdutil.findcmd(cmd, commands.table, False)
            realcmd = aliases[0]
        except (
            error.UnknownCommand,
            error.AmbiguousCommand,
            IndexError,
            getopt.GetoptError,
        ):
            # Don't handle this here. We know the command is
            # invalid, but all we're worried about for now is that
            # it's not a command that server operators expect to
            # be safe to offer to users in a sandbox.
            pass

        if realcmd == "serve" and "--read-only" in req.args:
            req.args.remove("--read-only")

            if not req.ui:
                req.ui = uimod.ui.load()
            req.ui.setconfig(
                "hooks", "pretxnopen.readonlyrejectpush", rejectpush, "dispatch"
            )
            req.ui.setconfig(
                "hooks", "prepushkey.readonlyrejectpush", rejectpush, "dispatch"
            )

        if realcmd == "serve" and "--stdio" in cmdargs:
            # We want to constrain 'hg serve --stdio' instances pretty
            # closely, as many shared-ssh access tools want to grant
            # access to run *only* 'hg -R $repo serve --stdio'. We
            # restrict to exactly that set of arguments, and prohibit
            # any repo name that starts with '--' to prevent
            # shenanigans wherein a user does something like pass
            # --debugger or --config=ui.debugger=1 as a repo
            # name. This used to actually run the debugger.
            if (
                len(req.args) != 4
                or req.args[0] != "-R"
                or req.args[1].startswith("--")
                or req.args[2] != "serve"
                or req.args[3] != "--stdio"
            ):
                raise error.Abort(
                    _("potentially unsafe serve --stdio invocation: %r") % (req.args,)
                )

        try:
            debugger = "pdb"
            debugtrace = {"pdb": pdb.set_trace}
            debugmortem = {"pdb": pdb.post_mortem}

            # --config takes prescendence over --configfile, so process
            # --configfile first --config second.
            for configfile in req.earlyoptions["configfile"]:
                req.ui.readconfig(configfile)

            # read --config before doing anything else
            # (e.g. to change trust settings for reading .hg/hgrc)
            cfgs = _parseconfig(req.ui, req.earlyoptions["config"])

            if req.repo:
                for configfile in req.earlyoptions["configfile"]:
                    req.repo.ui.readconfig(configfile)
                # copy configs that were passed on the cmdline (--config) to
                # the repo ui
                for sec, name, val in cfgs:
                    req.repo.ui.setconfig(sec, name, val, source="--config")

            # developer config: ui.debugger
            debugger = ui.config("ui", "debugger")
            debugmod = pdb
            if not debugger or ui.plain():
                # if we are in HGPLAIN mode, then disable custom debugging
                debugger = "pdb"
            elif req.earlyoptions["debugger"]:
                # This import can be slow for fancy debuggers, so only
                # do it when absolutely necessary, i.e. when actual
                # debugging has been requested
                with demandimport.deactivated():
                    try:
                        debugmod = __import__(debugger)
                    except ImportError:
                        pass  # Leave debugmod = pdb

            debugtrace[debugger] = debugmod.set_trace
            debugmortem[debugger] = debugmod.post_mortem

            # enter the debugger before command execution
            if req.earlyoptions["debugger"]:
                ui.warn(
                    _(
                        "entering debugger - "
                        "type c to continue starting hg or h for help\n"
                    )
                )

                if debugger != "pdb" and debugtrace[debugger] == debugtrace["pdb"]:
                    ui.warn(
                        _("%s debugger specified " "but its module was not found\n")
                        % debugger
                    )
                with demandimport.deactivated():
                    debugtrace[debugger]()
            try:
                return _dispatch(req)
            finally:
                ui.flush()
        except:  # re-raises
            # enter the debugger when we hit an exception
            if req.earlyoptions["debugger"]:
                traceback.print_exc()
                debugmortem[debugger](sys.exc_info()[2])
            raise

    return _callcatch(ui, _runcatchfunc)


def _callcatch(ui, func):
    """like scmutil.callcatch but handles more high-level exceptions about
    config parsing and commands. besides, use handlecommandexception to handle
    uncaught exceptions.
    """
    try:
        return scmutil.callcatch(ui, func)
    except error.AmbiguousCommand as inst:
        ui.warn(
            _("hg: command '%s' is ambiguous:\n    %s\n")
            % (inst.args[0], " ".join(inst.args[1]))
        )
    except error.CommandError as inst:
        if inst.args[0]:
            ui.pager("help")
            msgbytes = pycompat.bytestr(inst.args[1])
            ui.warn(_("hg %s: %s\n") % (inst.args[0], msgbytes))
            commands.help_(ui, inst.args[0], full=False, command=True)
        else:
            ui.pager("help")
            ui.warn(_("hg: %s\n") % inst.args[1])
            commands.help_(ui, "shortlist")
    except error.ParseError as inst:
        _formatparse(ui.warn, inst)
        return -1
    except error.UnknownCommand as inst:
        nocmdmsg = _("hg: unknown command '%s'\n") % inst.args[0]
        try:
            # check if the command is in a disabled extension
            # (but don't check for extensions themselves)
            formatted = help.formattedhelp(ui, commands, inst.args[0], unknowncmd=True)
            ui.warn(nocmdmsg)
            ui.write(formatted)
        except (error.UnknownCommand, error.Abort):
            suggested = False
            if len(inst.args) == 2:
                sim = _getsimilar(inst.args[1], inst.args[0])
                if sim:
                    ui.warn(nocmdmsg)
                    _reportsimilar(ui.warn, sim)
                    suggested = True
            if not suggested:
                ui.pager("help")
                ui.warn(nocmdmsg)
                commands.help_(ui, "shortlist")
    except error.UnknownSubcommand as inst:
        cmd, subcmd, allsubcmds = inst.args
        suggested = False
        if subcmd is not None:
            nosubcmdmsg = _("hg %s: unknown subcommand '%s'\n") % (cmd, subcmd)
            sim = _getsimilar(allsubcmds, subcmd)
            if sim:
                ui.warn(nosubcmdmsg)
                _reportsimilar(ui.warn, sim)
                suggested = True
        else:
            nosubcmdmsg = _("hg %s: subcommand required\n") % cmd
        if not suggested:
            ui.pager("help")
            ui.warn(nosubcmdmsg)
            commands.help_(ui, cmd)
    except IOError:
        raise
    except KeyboardInterrupt:
        raise
    except:  # probably re-raises
        if not handlecommandexception(ui):
            raise

    return -1


def aliasargs(fn, givenargs):
    args = []
    # only care about alias 'args', ignore 'args' set by extensions.wrapfunction
    if not util.safehasattr(fn, "_origfunc"):
        args = getattr(fn, "args", args)
    if args:
        cmd = " ".join(map(util.shellquote, args))

        nums = []

        def replacer(m):
            num = int(m.group(1)) - 1
            nums.append(num)
            if num < len(givenargs):
                return givenargs[num]
            raise error.Abort(_("too few arguments for command alias"))

        cmd = re.sub(br"\$(\d+|\$)", replacer, cmd)
        givenargs = [x for i, x in enumerate(givenargs) if i not in nums]
        args = pycompat.shlexsplit(cmd)
    return args + givenargs


def aliasinterpolate(name, args, cmd):
    """interpolate args into cmd for shell aliases

    This also handles $0, $@ and "$@".
    """
    # util.interpolate can't deal with "$@" (with quotes) because it's only
    # built to match prefix + patterns.
    replacemap = dict(("$%d" % (i + 1), arg) for i, arg in enumerate(args))
    replacemap["$0"] = name
    replacemap["$$"] = "$"
    replacemap["$@"] = " ".join(args)
    # Typical Unix shells interpolate "$@" (with quotes) as all the positional
    # parameters, separated out into words. Emulate the same behavior here by
    # quoting the arguments individually. POSIX shells will then typically
    # tokenize each argument into exactly one word.
    replacemap['"$@"'] = " ".join(util.shellquote(arg) for arg in args)
    # escape '\$' for regex
    regex = "|".join(replacemap.keys()).replace("$", br"\$")
    r = re.compile(regex)
    return r.sub(lambda x: replacemap[x.group()], cmd)


class cmdalias(object):
    def __init__(self, name, definition, cmdtable, source):
        self.name = self.cmd = name
        self.cmdname = ""
        self.definition = definition
        self.fn = None
        self.givenargs = []
        self.opts = []
        self.help = ""
        self.badalias = None
        self.unknowncmd = False
        self.source = source

        try:
            aliases, entry = cmdutil.findcmd(self.name, cmdtable)
            for alias, e in cmdtable.iteritems():
                if e is entry:
                    self.cmd = alias
                    break
            self.shadows = True
        except error.UnknownCommand:
            self.shadows = False

        if not self.definition:
            self.badalias = _("no definition for alias '%s'") % self.name
            return

        if self.definition.startswith("!"):
            self.shell = True

            def fn(ui, *args):
                env = {"HG_ARGS": " ".join((self.name,) + args)}

                def _checkvar(m):
                    if m.groups()[0] == "$":
                        return m.group()
                    elif int(m.groups()[0]) <= len(args):
                        return m.group()
                    else:
                        ui.debug(
                            "No argument found for substitution "
                            "of %i variable in alias '%s' definition."
                            % (int(m.groups()[0]), self.name)
                        )
                        return ""

                cmd = re.sub(br"\$(\d+|\$)", _checkvar, self.definition[1:])
                cmd = aliasinterpolate(self.name, args, cmd)
                return ui.system(cmd, environ=env, blockedtag="alias_%s" % self.name)

            self.fn = fn
            return

        try:
            args = pycompat.shlexsplit(self.definition)
        except ValueError as inst:
            self.badalias = _("error in definition for alias '%s': %s") % (
                self.name,
                inst,
            )
            return
        earlyopts, args = _earlysplitopts(args)
        if earlyopts:
            self.badalias = _(
                "error in definition for alias '%s': %s may "
                "only be given on the command line"
            ) % (self.name, "/".join(zip(*earlyopts)[0]))
            return

        self.cmdname = cmd = args[0]
        try:
            cmd, args, aliases, entry = cmdutil.findsubcmd(
                args, cmdtable, strict=False, partial=True
            )
            self.cmdname = cmd
            self.givenargs = args
            if len(entry) > 2:
                self.fn, self.opts, self.help = entry
            else:
                self.fn, self.opts = entry

            if self.help.startswith("hg " + cmd):
                # drop prefix in old-style help lines so hg shows the alias
                self.help = self.help[4 + len(cmd) :]
            self.norepo = self.fn.norepo
            self.__doc__ = self.fn.__doc__

        except error.UnknownCommand:
            self.badalias = _("alias '%s' resolves to unknown command '%s'") % (
                self.name,
                cmd,
            )
            self.unknowncmd = True
        except error.AmbiguousCommand:
            self.badalias = _("alias '%s' resolves to ambiguous command '%s'") % (
                self.name,
                cmd,
            )
        except error.UnknownSubcommand as e:
            cmd, subcmd, __ = e.args
            self.badalias = _(
                "alias '%s' resolves to unknown subcommand " "'%s %s'"
            ) % (self.name, cmd, subcmd)

    @property
    def args(self):
        args = pycompat.maplist(util.expandpath, self.givenargs)
        return aliasargs(self.fn, args)

    def __getattr__(self, name):
        adefaults = {
            r"norepo": True,
            r"cmdtype": unrecoverablewrite,
            r"optionalrepo": False,
            r"inferrepo": False,
            r"subcommands": {},
            r"subonly": False,
        }
        if name not in adefaults:
            raise AttributeError(name)
        if self.badalias or util.safehasattr(self, "shell"):
            return adefaults[name]
        return getattr(self.fn, name)

    def __call__(self, ui, *args, **opts):
        if self.badalias:
            hint = None
            if self.unknowncmd:
                try:
                    # check if the command is in a disabled extension
                    cmd, ext = extensions.disabledcmd(ui, self.cmdname)[:2]
                    hint = _("'%s' is provided by '%s' extension") % (cmd, ext)
                except error.UnknownCommand:
                    pass
            raise error.Abort(self.badalias, hint=hint)
        if self.shadows:
            ui.debug("alias '%s' shadows command '%s'\n" % (self.name, self.cmdname))

        ui.log(
            "commandalias", "alias '%s' expands to '%s'\n", self.name, self.definition
        )
        if util.safehasattr(self, "shell"):
            return self.fn(ui, *args, **opts)
        else:
            try:
                return util.checksignature(self.fn)(ui, *args, **opts)
            except error.SignatureError:
                args = " ".join([self.cmdname] + self.args)
                ui.debug("alias '%s' expands to '%s'\n" % (self.name, args))
                raise


class lazyaliasentry(object):
    """like a typical command entry (func, opts, help), but is lazy"""

    def __init__(self, name, definition, cmdtable, source):
        self.name = name
        self.definition = definition
        self.cmdtable = cmdtable.copy()
        self.source = source

    @util.propertycache
    def _aliasdef(self):
        return cmdalias(self.name, self.definition, self.cmdtable, self.source)

    def __getitem__(self, n):
        aliasdef = self._aliasdef
        l = [aliasdef, aliasdef.opts, aliasdef.help]
        return l[n]

    def __iter__(self):
        for i in range(3):
            yield self[i]

    def __len__(self):
        return 3


def addaliases(ui, cmdtable):
    # aliases are processed after extensions have been loaded, so they
    # may use extension commands. Aliases can also use other alias definitions,
    # but only if they have been defined prior to the current definition.
    for alias, definition in ui.configitems("alias"):
        try:
            if cmdtable[alias].definition == definition:
                continue
        except (KeyError, AttributeError):
            # definition might not exist or it might not be a cmdalias
            pass

        source = ui.configsource("alias", alias)
        entry = lazyaliasentry(alias, definition, cmdtable, source)
        cmdtable[alias] = entry


def _parse(ui, args):
    options = {}
    cmdoptions = {}

    try:
        args = fancyopts.fancyopts(args, commands.globalopts, options)
    except getopt.GetoptError as inst:
        raise error.CommandError(None, inst)

    if args:
        strict = ui.configbool("ui", "strict")
        cmd, args, aliases, entry = cmdutil.findsubcmd(args, commands.table, strict)
        args = aliasargs(entry[0], args)
        defaults = ui.config("defaults", cmd)
        if defaults:
            args = (
                pycompat.maplist(util.expandpath, pycompat.shlexsplit(defaults)) + args
            )
        c = list(entry[1])
    else:
        cmd = None
        c = []

    # combine global options into local
    for o in commands.globalopts:
        c.append((o[0], o[1], options[o[1]], o[3]))

    try:
        args = fancyopts.fancyopts(args, c, cmdoptions, gnu=True)
    except getopt.GetoptError as inst:
        raise error.CommandError(cmd, inst)

    # separate global options back out
    for o in commands.globalopts:
        n = o[1]
        options[n] = cmdoptions[n]
        del cmdoptions[n]

    return (cmd, cmd and entry[0] or None, args, options, cmdoptions)


def _parseconfig(ui, config):
    """parse the --config options from the command line"""
    configs = []

    for cfg in config:
        try:
            name, value = [cfgelem.strip() for cfgelem in cfg.split("=", 1)]
            section, name = name.split(".", 1)
            if not section or not name:
                raise IndexError
            ui.setconfig(section, name, value, "--config")
            configs.append((section, name, value))
        except (IndexError, ValueError):
            raise error.Abort(
                _("malformed --config option: %r " "(use --config section.name=value)")
                % cfg
            )

    return configs


def _earlyparseopts(ui, args):
    options = {}
    fancyopts.fancyopts(
        args,
        commands.globalopts,
        options,
        gnu=not ui.plain("strictflags"),
        early=True,
        optaliases={"repository": ["repo"]},
    )
    return options


def _earlysplitopts(args):
    """Split args into a list of possible early options and remainder args"""
    shortoptions = "R:"
    # TODO: perhaps 'debugger' should be included
    longoptions = ["cwd=", "repository=", "repo=", "config="]
    return fancyopts.earlygetopt(
        args, shortoptions, longoptions, gnu=True, keepsep=True
    )


def runcommand(lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions):
    # run pre-hook, and abort if it fails
    hook.hook(
        lui,
        repo,
        "pre-%s" % cmd,
        True,
        args=" ".join(fullargs),
        pats=cmdpats,
        opts=cmdoptions,
    )
    try:
        hintutil.loadhintconfig(lui)
        ui.log("jobid", jobid=encoding.environ.get("HG_JOB_ID", "unknown"))
        ret = _runcommand(ui, options, cmd, d)
        # run post-hook, passing command result
        hook.hook(
            lui,
            repo,
            "post-%s" % cmd,
            False,
            args=" ".join(fullargs),
            result=ret,
            pats=cmdpats,
            opts=cmdoptions,
        )
        hintutil.show(lui)
    except Exception:
        # run failure hook and re-raise
        hook.hook(
            lui,
            repo,
            "fail-%s" % cmd,
            False,
            args=" ".join(fullargs),
            pats=cmdpats,
            opts=cmdoptions,
        )
        raise
    return ret


def _getlocal(ui, rpath, wd=None):
    """Return (path, local ui object) for the given target path.

    Takes paths in [cwd]/.hg/hgrc into account."
    """
    if wd is None:
        try:
            wd = pycompat.getcwd()
        except OSError as e:
            raise error.Abort(
                _("error getting current working directory: %s")
                % encoding.strtolocal(e.strerror)
            )
    path = cmdutil.findrepo(wd) or ""
    if not path:
        lui = ui
    else:
        lui = ui.copy()
        lui.readconfig(os.path.join(path, ".hg", "hgrc"), path)

    if rpath:
        path = lui.expandpath(rpath)
        lui = ui.copy()
        lui.readconfig(os.path.join(path, ".hg", "hgrc"), path)

    return path, lui


def _checkshellalias(lui, ui, args):
    """Return the function to run the shell alias, if it is required"""
    options = {}

    try:
        args = fancyopts.fancyopts(args, commands.globalopts, options)
    except getopt.GetoptError:
        return

    if not args:
        return

    cmdtable = commands.table

    cmd = args[0]
    try:
        strict = ui.configbool("ui", "strict")
        aliases, entry = cmdutil.findcmd(cmd, cmdtable, strict)
    except (error.AmbiguousCommand, error.UnknownCommand):
        return

    cmd = aliases[0]
    fn = entry[0]

    if cmd and util.safehasattr(fn, "shell"):
        # shell alias shouldn't receive early options which are consumed by hg
        _earlyopts, args = _earlysplitopts(args)
        d = lambda: fn(ui, *args[1:])
        return lambda: runcommand(lui, None, cmd, args[:1], ui, options, d, [], {})


def _dispatch(req):
    args = req.args
    ui = req.ui

    # check for cwd
    cwd = req.earlyoptions["cwd"]
    if cwd:
        os.chdir(cwd)

    rpath = req.earlyoptions["repository"]
    path, lui = _getlocal(ui, rpath)

    uis = {ui, lui}

    if req.repo:
        uis.add(req.repo.ui)

    if req.earlyoptions["profile"]:
        for ui_ in uis:
            ui_.setconfig("profiling", "enabled", "true", "--profile")

    profile = lui.configbool("profiling", "enabled")
    with profiling.profile(lui, enabled=profile) as profiler:
        # Configure extensions in phases: uisetup, extsetup, cmdtable, and
        # reposetup
        extensions.loadall(lui)
        # Propagate any changes to lui.__class__ by extensions
        ui.__class__ = lui.__class__

        # (uisetup and extsetup are handled in extensions.loadall)

        # (reposetup is handled in hg.repository)

        addaliases(lui, commands.table)

        # All aliases and commands are completely defined, now.
        # Check abbreviation/ambiguity of shell alias.
        shellaliasfn = _checkshellalias(lui, ui, args)
        if shellaliasfn:
            return shellaliasfn()

        # check for fallback encoding
        fallback = lui.config("ui", "fallbackencoding")
        if fallback:
            encoding.fallbackencoding = fallback

        fullargs = args
        cmd, func, args, options, cmdoptions = _parse(lui, args)

        if options["encoding"]:
            encoding.encoding = options["encoding"]
        if options["encodingmode"]:
            encoding.encodingmode = options["encodingmode"]
        i18n.init()

        if options["config"] != req.earlyoptions["config"]:
            raise error.Abort(_("option --config may not be abbreviated!"))
        if options["configfile"] != req.earlyoptions["configfile"]:
            raise error.Abort(_("option --configfile may not be abbreviated!"))
        if options["cwd"] != req.earlyoptions["cwd"]:
            raise error.Abort(_("option --cwd may not be abbreviated!"))
        if options["repository"] != req.earlyoptions["repository"]:
            raise error.Abort(
                _(
                    "option -R has to be separated from other options (e.g. not "
                    "-qR) and --repository may only be abbreviated as --repo!"
                )
            )
        if options["debugger"] != req.earlyoptions["debugger"]:
            raise error.Abort(_("option --debugger may not be abbreviated!"))
        # don't validate --profile/--traceback, which can be enabled from now

        if options["time"]:

            def get_times():
                t = os.times()
                if t[4] == 0.0:
                    # Windows leaves this as zero, so use time.clock()
                    t = (t[0], t[1], t[2], t[3], time.clock())
                return t

            s = get_times()

            def print_time():
                t = get_times()
                ui.warn(
                    _("time: real %.3f secs (user %.3f+%.3f sys %.3f+%.3f)\n")
                    % (t[4] - s[4], t[0] - s[0], t[2] - s[2], t[1] - s[1], t[3] - s[3])
                )

            ui.atexit(print_time)
        if options["profile"]:
            profiler.start()

        if options["verbose"] or options["debug"] or options["quiet"]:
            for opt in ("verbose", "debug", "quiet"):
                val = str(bool(options[opt]))
                if pycompat.ispy3:
                    val = val.encode("ascii")
                for ui_ in uis:
                    ui_.setconfig("ui", opt, val, "--" + opt)

        if options["traceback"]:
            for ui_ in uis:
                ui_.setconfig("ui", "traceback", "on", "--traceback")

        if options["noninteractive"]:
            for ui_ in uis:
                ui_.setconfig("ui", "interactive", "off", "-y")

        if cmdoptions.get("insecure", False):
            for ui_ in uis:
                ui_.insecureconnections = True

        # setup color handling before pager, because setting up pager
        # might cause incorrect console information
        coloropt = options["color"]
        for ui_ in uis:
            if coloropt:
                ui_.setconfig("ui", "color", coloropt, "--color")
            color.setup(ui_)

        if util.parsebool(options["pager"]):
            # ui.pager() expects 'internal-always-' prefix in this case
            ui.pager("internal-always-" + cmd)
        elif options["pager"] != "auto":
            for ui_ in uis:
                ui_.disablepager()

        if options["version"]:
            return commands.version_(ui)
        if options["help"]:
            return commands.help_(ui, cmd, command=cmd is not None)
        elif not cmd:
            return commands.help_(ui, "shortlist")

        repo = None
        cmdpats = args[:]
        if not func.norepo:
            # use the repo from the request only if we don't have -R
            if not rpath and not cwd:
                repo = req.repo

            if repo:
                # set the descriptors of the repo ui to those of ui
                repo.ui.fin = ui.fin
                repo.ui.fout = ui.fout
                repo.ui.ferr = ui.ferr
            else:
                try:
                    repo = hg.repository(ui, path=path, presetupfuncs=req.prereposetups)
                    if not repo.local():
                        raise error.Abort(_("repository '%s' is not local") % path)
                    repo.ui.setconfig("bundle", "mainreporoot", repo.root, "repo")
                except error.RequirementError:
                    raise
                except error.RepoError:
                    if rpath:  # invalid -R path
                        raise
                    if not func.optionalrepo:
                        if func.inferrepo and args and not path:
                            # try to infer -R from command args
                            repos = pycompat.maplist(cmdutil.findrepo, args)
                            guess = repos[0]
                            if guess and repos.count(guess) == len(repos):
                                req.args = ["--repository", guess] + fullargs
                                req.earlyoptions["repository"] = guess
                                return _dispatch(req)
                        if not path:
                            raise error.RepoError(
                                _("no repository found in" " '%s' (.hg not found)")
                                % pycompat.getcwd()
                            )
                        raise
            if repo:
                ui = repo.ui
                if options["hidden"]:
                    repo = repo.unfiltered()
            args.insert(0, repo)
        elif rpath:
            ui.warn(_("warning: --repository ignored\n"))

        from . import mdiff

        mdiff.init(ui)

        msg = _formatargs(fullargs)
        ui.log("command", "%s\n", msg)
        strcmdopt = pycompat.strkwargs(cmdoptions)
        d = lambda: util.checksignature(func)(ui, *args, **strcmdopt)
        try:
            return runcommand(
                lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions
            )
        finally:
            if repo and repo != req.repo:
                repo.close()


def _runcommand(ui, options, cmd, cmdfunc):
    """Run a command function, possibly with profiling enabled."""
    try:
        return cmdfunc()
    except error.SignatureError:
        raise error.CommandError(cmd, _("invalid arguments"))


def _exceptionwarning(ui):
    """Produce a warning message for the current active exception"""

    # For compatibility checking, we discard the portion of the hg
    # version after the + on the assumption that if a "normal
    # user" is running a build with a + in it the packager
    # probably built from fairly close to a tag and anyone with a
    # 'make local' copy of hg (where the version number can be out
    # of date) will be clueful enough to notice the implausible
    # version number and try updating.
    ct = util.versiontuple(n=2)
    worst = None, ct, ""
    if ui.config("ui", "supportcontact") is None:
        for name, mod in extensions.extensions():
            testedwith = getattr(mod, "testedwith", "")
            if pycompat.ispy3 and isinstance(testedwith, str):
                testedwith = testedwith.encode(u"utf-8")
            report = getattr(mod, "buglink", _("the extension author."))
            if not testedwith.strip():
                # We found an untested extension. It's likely the culprit.
                worst = name, "unknown", report
                break

            # Never blame on extensions bundled with Mercurial.
            if extensions.ismoduleinternal(mod):
                continue

            tested = [util.versiontuple(t, 2) for t in testedwith.split()]
            if ct in tested:
                continue

            lower = [t for t in tested if t < ct]
            nearest = max(lower or tested)
            if worst[0] is None or nearest < worst[1]:
                worst = name, nearest, report
    if worst[0] is not None:
        name, testedwith, report = worst
        if not isinstance(testedwith, (bytes, str)):
            testedwith = ".".join([str(c) for c in testedwith])
        warning = _(
            "** Unknown exception encountered with "
            "possibly-broken third-party extension %s.\n"
            "** Please disable %s and try your action again.\n"
            "** If that fixes the bug please report it to %s\n"
        ) % (name, name, report)
    else:
        bugtracker = ui.config("ui", "supportcontact")
        if bugtracker is None:
            bugtracker = _("https://mercurial-scm.org/wiki/BugTracker")
        warning = (
            _("** unknown exception encountered, " "please report by visiting\n** ")
            + bugtracker
            + "\n"
        )
    if pycompat.ispy3:
        sysversion = sys.version.encode(u"utf-8")
    else:
        sysversion = sys.version
    sysversion = sysversion.replace("\n", "")
    warning += (
        (_("** Python %s\n") % sysversion)
        + (_("** Mercurial Distributed SCM (version %s)\n") % util.version())
        + (
            _("** Extensions loaded: %s\n")
            % ", ".join([x[0] for x in extensions.extensions()])
        )
    )
    return warning


def handlecommandexception(ui):
    """Produce a warning message for broken commands

    Called when handling an exception; the exception is reraised if
    this function returns False, ignored otherwise.
    """
    warning = _exceptionwarning(ui)
    ui.log("commandexception", "%s\n%s\n", warning, traceback.format_exc())
    ui.warn(warning)
    return False  # re-raise the exception


def rejectpush(ui, **kwargs):
    ui.warn(("Permission denied - blocked by readonlyrejectpush hook\n"))
    # mercurial hooks use unix process conventions for hook return values
    # so a truthy return means failure
    return True