[ceph.git] / ceph / src / ceph.in

#!@Python3_EXECUTABLE@
# -*- mode:python -*-
# vim: ts=4 sw=4 smarttab expandtab
#
# Processed in Makefile to add python #! line and version variable
#
#


"""
ceph.in becomes ceph, the command-line management tool for Ceph clusters.
This is a replacement for tools/ceph.cc and tools/common.cc.

Copyright (C) 2013 Inktank Storage, Inc.

This is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License version 2, as published by the Free Software
Foundation.  See file COPYING.
"""

from time import sleep
import grp
import os
import pwd
import re
import shutil
import stat
import sys
import time
import platform

from typing import Dict, List, Sequence, Tuple

try:
    input = raw_input
except NameError:
    pass

CEPH_GIT_VER = "@CEPH_GIT_VER@"
CEPH_GIT_NICE_VER = "@CEPH_GIT_NICE_VER@"
CEPH_RELEASE = "@CEPH_RELEASE@"
CEPH_RELEASE_NAME = "@CEPH_RELEASE_NAME@"
CEPH_RELEASE_TYPE = "@CEPH_RELEASE_TYPE@"

# priorities from src/common/perf_counters.h
PRIO_CRITICAL = 10
PRIO_INTERESTING = 8
PRIO_USEFUL = 5
PRIO_UNINTERESTING = 2
PRIO_DEBUGONLY = 0

PRIO_DEFAULT = PRIO_INTERESTING

# Make life easier on developers:
# If our parent dir contains CMakeCache.txt and bin/init-ceph,
# assume we're running from a build dir (i.e. src/build/bin/ceph)
# and tweak sys.path and LD_LIBRARY_PATH to use built files.
# Since this involves re-execing, if CEPH_DBG is set in the environment
# re-exec with -mpdb.  Also, if CEPH_DEV is in the env, suppress
# the warning message about the DEVELOPER MODE.

MYPATH = os.path.abspath(__file__)
MYDIR = os.path.dirname(MYPATH)
MYPDIR = os.path.dirname(MYDIR)
DEVMODEMSG = '*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***'


def add_to_ld_path(path_name, path):
    paths = re.split('[ :]', os.environ.get(path_name, ''))
    if path in paths:
        return 0
    else:
        paths.insert(0, path)
        os.environ[path_name] = ':'.join(paths)
        return 1


def respawn_in_path(lib_path, pybind_path, pythonlib_path, asan_lib_path):
    if platform.system() == "Darwin":
        lib_path_var = "DYLD_LIBRARY_PATH"
    else:
        lib_path_var = "LD_LIBRARY_PATH"

    ld_paths_changed = 0
    preload_libcxx = os.environ.get('CEPH_PRELOAD_LIBCXX')
    if preload_libcxx:
        ld_paths_changed += add_to_ld_path('LD_PRELOAD', preload_libcxx)
    if asan_lib_path:
        ld_paths_changed += add_to_ld_path('LD_PRELOAD', asan_lib_path)
    ld_paths_changed += add_to_ld_path(lib_path_var, lib_path)
    if ld_paths_changed > 0:
        if "CEPH_DEV" not in os.environ:
            print(DEVMODEMSG, file=sys.stderr)
        execv_cmd = []
        if 'CEPH_DBG' in os.environ:
            execv_cmd += ['@Python3_EXECUTABLE@', '-mpdb']
        execv_cmd += sys.argv
        os.execvp(execv_cmd[0], execv_cmd)
    else:
        sys.path.insert(0, pybind_path)
        sys.path.insert(0, pythonlib_path)


def get_pythonlib_dir():
    """Returns the name of a distutils build directory"""
    return "lib.{version[0]}".format(version=sys.version_info)


def get_cmake_variables(*names):
    vars = dict((name, None) for name in names)
    for line in open(os.path.join(MYPDIR, "CMakeCache.txt")):
        # parse lines like "WITH_ASAN:BOOL=ON"
        for name in names:
            if line.startswith("{}:".format(name)):
                type_value = line.split(":")[1].strip()
                t, v = type_value.split("=")
                if t == 'BOOL':
                    v = v.upper() in ('TRUE', '1', 'Y', 'YES', 'ON')
                vars[name] = v
                break
        if all(vars.values()):
            break
    return [vars[name] for name in names]


if os.path.exists(os.path.join(MYPDIR, "CMakeCache.txt")) \
     and os.path.exists(os.path.join(MYPDIR, "bin/init-ceph")):
    src_path, with_asan, asan_lib_path = \
        get_cmake_variables("ceph_SOURCE_DIR", "WITH_ASAN", "ASAN_LIBRARY")
    if src_path is None:
        # Huh, maybe we're not really in a cmake environment?
        pass
    else:
        # Developer mode, but in a cmake build dir instead of the src dir
        lib_path = os.path.join(MYPDIR, "lib")
        bin_path = os.path.join(MYPDIR, "bin")
        pybind_path = os.path.join(src_path, "src", "pybind")
        pythonlib_path = os.path.join(lib_path,
                                      "cython_modules",
                                      get_pythonlib_dir())
        respawn_in_path(lib_path, pybind_path, pythonlib_path,
                        asan_lib_path if with_asan else None)

        if 'PATH' in os.environ and bin_path not in os.environ['PATH']:
            os.environ['PATH'] = os.pathsep.join([bin_path, os.environ['PATH']])

import argparse
import errno
import json
import rados
import shlex
import signal
import string
import subprocess

from ceph_argparse import \
    concise_sig, descsort_key, parse_json_funcsigs, \
    validate_command, find_cmd_target, \
    json_command, run_in_thread, Flag

from ceph_daemon import admin_socket, DaemonWatcher, Termsize

# just a couple of globals

verbose = False
cluster_handle = None


def raw_write(buf):
    sys.stdout.flush()
    sys.stdout.buffer.write(buf)


def osdids():
    ret, outbuf, outs = json_command(cluster_handle, prefix='osd ls')
    if ret:
        raise RuntimeError('Can\'t contact mon for osd list')
    return [line.decode('utf-8') for line in outbuf.split(b'\n') if line]


def monids():
    ret, outbuf, outs = json_command(cluster_handle, prefix='mon dump',
                                     argdict={'format': 'json'})
    if ret:
        raise RuntimeError('Can\'t contact mon for mon list')
    d = json.loads(outbuf.decode('utf-8'))
    return [m['name'] for m in d['mons']]


def mdsids():
    ret, outbuf, outs = json_command(cluster_handle, prefix='fs dump',
                                     argdict={'format': 'json'})
    if ret:
        raise RuntimeError('Can\'t contact mon for mds list')
    d = json.loads(outbuf.decode('utf-8'))
    l = []
    for info in d['standbys']:
        l.append(info['name'])
    for fs in d['filesystems']:
        for info in fs['mdsmap']['info'].values():
            l.append(info['name'])
    return l


def mgrids():
    ret, outbuf, outs = json_command(cluster_handle, prefix='mgr dump',
                                     argdict={'format': 'json'})
    if ret:
        raise RuntimeError('Can\'t contact mon for mgr list')

    d = json.loads(outbuf.decode('utf-8'))
    l = []
    l.append(d['active_name'])
    # we can only send tell commands to the active mgr
    #for i in d['standbys']:
    #    l.append(i['name'])
    return l


def ids_by_service(service):
    ids = {"mon": monids,
           "osd": osdids,
           "mds": mdsids,
           "mgr": mgrids}
    return ids[service]()


def validate_target(target):
    """
      this function will return true iff target is a correct
      target, such as mon.a/osd.2/mds.a/mgr.

      target: array, likes ['osd', '2']
      return: bool, or raise RuntimeError
    """

    if len(target) == 2:
        # for case "service.id"
        service_name, service_id = target[0], target[1]
        try:
            exist_ids = ids_by_service(service_name)
        except KeyError:
            print('WARN: {0} is not a legal service name, should be one of mon/osd/mds/mgr'.format(service_name),
                  file=sys.stderr)
            return False

        if service_id in exist_ids or len(exist_ids) > 0 and service_id == '*':
            return True
        else:
            print('WARN: the service id you provided does not exist. service id should '
                  'be one of {0}.'.format('/'.join(exist_ids)), file=sys.stderr)
            return False

    elif len(target) == 1 and target[0] in ['mgr', 'mon']:
        return True
    else:
        print('WARN: \"{0}\" is not a legal target. it should be one of mon.<id>/osd.<int>/mds.<id>/mgr'.format('.'.join(target)), file=sys.stderr)
        return False


# these args must be passed to all child programs
GLOBAL_ARGS = {
    'client_id': '--id',
    'client_name': '--name',
    'cluster': '--cluster',
    'cephconf': '--conf',
}


def parse_cmdargs(args=None, target='') -> Tuple[argparse.ArgumentParser,
                                                 argparse.Namespace,
                                                 List[str]]:
    """
    Consume generic arguments from the start of the ``args``
    list.  Call this first to handle arguments that are not
    handled by a command description provided by the server.

    :returns: three tuple of ArgumentParser instance, Namespace instance
              containing parsed values, and list of un-handled arguments
    """
    # alias: let the line-wrapping be sane
    AP = argparse.ArgumentParser

    # format our own help
    parser = AP(description='Ceph administration tool', add_help=False)

    parser.add_argument('--completion', action='store_true',
                        help=argparse.SUPPRESS)

    parser.add_argument('-h', '--help', help='request mon help',
                        action='store_true')

    parser.add_argument('-c', '--conf', dest='cephconf',
                        help='ceph configuration file')
    parser.add_argument('-i', '--in-file', dest='input_file',
                        help='input file, or "-" for stdin')
    parser.add_argument('-o', '--out-file', dest='output_file',
                        help='output file, or "-" for stdout')
    parser.add_argument('--setuser', dest='setuser',
                        help='set user file permission')
    parser.add_argument('--setgroup', dest='setgroup',
                        help='set group file permission')
    parser.add_argument('--id', '--user', dest='client_id',
                        help='client id for authentication')
    parser.add_argument('--name', '-n', dest='client_name',
                        help='client name for authentication')
    parser.add_argument('--cluster', help='cluster name')

    parser.add_argument('--admin-daemon', dest='admin_socket',
                        help='submit admin-socket commands (\"help\" for help)')

    parser.add_argument('-s', '--status', action='store_true',
                        help='show cluster status')

    parser.add_argument('-w', '--watch', action='store_true',
                        help='watch live cluster changes')
    parser.add_argument('--watch-debug', action='store_true',
                        help='watch debug events')
    parser.add_argument('--watch-info', action='store_true',
                        help='watch info events')
    parser.add_argument('--watch-sec', action='store_true',
                        help='watch security events')
    parser.add_argument('--watch-warn', action='store_true',
                        help='watch warn events')
    parser.add_argument('--watch-error', action='store_true',
                        help='watch error events')

    parser.add_argument('-W', '--watch-channel', dest="watch_channel",
                        help="watch live cluster changes on a specific channel "
                        "(e.g., cluster, audit, cephadm, or '*' for all)")

    parser.add_argument('--version', '-v', action="store_true", help="display version")
    parser.add_argument('--verbose', action="store_true", help="make verbose")
    parser.add_argument('--concise', dest='verbose', action="store_false",
                        help="make less verbose")

    parser.add_argument('-f', '--format', choices=['json', 'json-pretty',
                        'xml', 'xml-pretty', 'plain', 'yaml'], dest='output_format')

    parser.add_argument('--connect-timeout', dest='cluster_timeout',
                        type=int,
                        help='set a timeout for connecting to the cluster')

    parser.add_argument('--block', action='store_true',
                        help='block until completion (scrub and deep-scrub only)')
    parser.add_argument('--period', '-p', default=1, type=float,
                        help='polling period, default 1.0 second (for ' \
                        'polling commands only)')

    # returns a Namespace with the parsed args, and a list of all extras
    parsed_args, extras = parser.parse_known_args(args)

    return parser, parsed_args, extras


def hdr(s):
    print('\n', s, '\n', '=' * len(s))


def do_basic_help(parser, args):
    """
    Print basic parser help
    If the cluster is available, get and print monitor help
    """
    hdr('General usage:')
    parser.print_help()
    print_locally_handled_command_help()


def print_locally_handled_command_help():
    hdr("Local commands:")
    print("""
ping <mon.id>           Send simple presence/life test to a mon
                        <mon.id> may be 'mon.*' for all mons
daemon {type.id|path} <cmd>
                        Same as --admin-daemon, but auto-find admin socket
daemonperf {type.id | path} [stat-pats] [priority] [<interval>] [<count>]
daemonperf {type.id | path} list|ls [stat-pats] [priority]
                        Get selected perf stats from daemon/admin socket
                        Optional shell-glob comma-delim match string stat-pats
                        Optional selection priority (can abbreviate name):
                         critical, interesting, useful, noninteresting, debug
                        List shows a table of all available stats
                        Run <count> times (default forever),
                         once per <interval> seconds (default 1)
    """, file=sys.stdout)


def do_extended_help(parser, args, target, partial) -> int:
    def help_for_sigs(sigs, partial=None):
        try:
            while True:
                out = format_help(parse_json_funcsigs(sigs, 'cli'),
                                  partial=partial)
                if not out and partial:
                    # shorten partial until we get at least one matching command prefix
                    partial = ' '.join(partial.split()[:-1])
                    continue
                sys.stdout.write(out)
                break
        except BrokenPipeError:
            pass

    def help_for_target(target, partial=None):
        # wait for osdmap because we know this is sent after the mgrmap
        # and monmap (it's alphabetical).
        cluster_handle.wait_for_latest_osdmap()
        ret, outbuf, outs = json_command(cluster_handle, target=target,
                                         prefix='get_command_descriptions',
                                         timeout=10)
        if ret:
            if (ret == -errno.EPERM or ret == -errno.EACCES) and target[0] in ('osd', 'mds'):
                print("Permission denied.  Check that your user has 'allow *' "
                      "capabilities for the target daemon type.", file=sys.stderr)
            elif ret == -errno.EPERM:
                print("Permission denied.  Check your user has proper "
                      "capabilities configured", file=sys.stderr)
            else:
                print("couldn't get command descriptions for {0}: {1} ({2})".
                      format(target, outs, ret), file=sys.stderr)
            return ret
        else:
            return help_for_sigs(outbuf.decode('utf-8'), partial)

    assert(cluster_handle.state == "connected")
    return help_for_target(target, partial)

DONTSPLIT = string.ascii_letters + '{[<>]}'


def wrap(s, width, indent):
    """
    generator to transform s into a sequence of strings width or shorter,
    for wrapping text to a specific column width.
    Attempt to break on anything but DONTSPLIT characters.
    indent is amount to indent 2nd-through-nth lines.

    so "long string long string long string" width=11 indent=1 becomes
    'long string', ' long string', ' long string' so that it can be printed
    as
    long string
     long string
     long string

    Consumes s.
    """
    result = ''
    leader = ''
    while len(s):

        if len(s) <= width:
            # no splitting; just possibly indent
            result = leader + s
            s = ''
            yield result

        else:
            splitpos = width
            while (splitpos > 0) and (s[splitpos-1] in DONTSPLIT):
                splitpos -= 1

            if splitpos == 0:
                splitpos = width

            if result:
                # prior result means we're mid-iteration, indent
                result = leader
            else:
                # first time, set leader and width for next
                leader = ' ' * indent
                width -= 1      # for subsequent space additions

            # remove any leading spaces in this chunk of s
            result += s[:splitpos].lstrip()
            s = s[splitpos:]

            yield result


def format_help(cmddict, partial=None) -> str:
    """
    Formats all the cmdsigs and helptexts from cmddict into a sorted-by-
    cmdsig 2-column display, with each column wrapped and indented to
    fit into (terminal_width / 2) characters.
    """

    fullusage = ''
    for cmd in sorted(cmddict.values(), key=descsort_key):

        if not cmd['help']:
            continue
        flags = cmd.get('flags', 0)
        if flags & (Flag.OBSOLETE | Flag.DEPRECATED | Flag.HIDDEN):
            continue
        concise = concise_sig(cmd['sig'])
        if partial and not concise.startswith(partial):
            continue
        width = Termsize().cols - 1  # 1 for the line between sig and help
        sig_width = int(width / 2)
        # make sure width == sig_width + help_width, even (width % 2 > 0)
        help_width = int(width / 2) + (width % 2)
        siglines = [l for l in wrap(concise, sig_width, 1)]
        helplines = [l for l in wrap(cmd['help'], help_width, 1)]

        # make lists the same length
        maxlen = max(len(siglines), len(helplines))
        siglines.extend([''] * (maxlen - len(siglines)))
        helplines.extend([''] * (maxlen - len(helplines)))

        # so we can zip them for output
        for s, h in zip(siglines, helplines):
            fullusage += '{s:{w}s} {h}\n'.format(s=s, h=h, w=sig_width)

    return fullusage


def ceph_conf(parsed_args, field, name, pid=None):
    cmd = 'ceph-conf'
    bindir = os.path.dirname(__file__)
    if shutil.which(cmd):
        args = [cmd]
    elif shutil.which(cmd, path=bindir):
        args = [os.path.join(bindir, cmd)]
    else:
        raise RuntimeError('"ceph-conf" not found')

    if name:
        args.extend(['--name', name])
    if pid:
        args.extend(['--pid', pid])

    # add any args in GLOBAL_ARGS
    for key, val in GLOBAL_ARGS.items():
        # ignore name in favor of argument name, if any
        if name and key == 'client_name':
            continue
        if getattr(parsed_args, key):
            args.extend([val, getattr(parsed_args, key)])

    args.extend(['--show-config-value', field])
    p = subprocess.Popen(
        args,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE)
    outdata, errdata = p.communicate()
    if p.returncode != 0:
        raise RuntimeError('unable to get conf option %s for %s: %s' % (field, name, errdata))
    return outdata.rstrip()


PROMPT = 'ceph> '

if sys.stdin.isatty():
    def read_input():
        while True:
            line = input(PROMPT).rstrip()
            if line in ['q', 'quit', 'Q', 'exit']:
                return None
            if line:
                return line
else:
    def read_input():
        while True:
            line = sys.stdin.readline()
            if not line:
                return None
            line = line.rstrip()
            if line:
                return line


def do_command(parsed_args, target, cmdargs, sigdict, inbuf, verbose):
    ''' Validate a command, and handle the polling flag '''

    valid_dict = validate_command(sigdict, cmdargs, verbose)
    # Validate input args against list of sigs
    if valid_dict:
        if parsed_args.output_format:
            valid_dict['format'] = parsed_args.output_format
        if verbose:
            print("Submitting command: ", valid_dict, file=sys.stderr)
    else:
        return -errno.EINVAL, '', 'invalid command'

    next_header_print = 0
    # Set extra options for polling commands only:
    if valid_dict.get('poll', False):
        valid_dict['width'] = Termsize().cols
    while True:
        try:
            # Only print the header for polling commands
            if next_header_print == 0 and valid_dict.get('poll', False):
                valid_dict['print_header'] = True
                next_header_print = Termsize().rows - 3
            next_header_print -= 1
            ret, outbuf, outs = json_command(cluster_handle, target=target,
                argdict=valid_dict, inbuf=inbuf, verbose=verbose)
            if valid_dict.get('poll', False):
                valid_dict['print_header'] = False
            if not valid_dict.get('poll', False):
                # Don't print here if it's not a polling command
                break
            if ret:
                ret = abs(ret)
                print('Error: {0} {1}'.format(ret, errno.errorcode.get(ret, 'Unknown')),
                        file=sys.stderr)
                break
            if outbuf:
                print(outbuf.decode('utf-8'))
            if outs:
                print(outs, file=sys.stderr)
            if parsed_args.period <= 0:
                break
            sleep(parsed_args.period)
        except KeyboardInterrupt:
            print('Interrupted')
            return errno.EINTR, '', ''
    if ret == errno.ETIMEDOUT:
        ret = -ret
        if not outs:
            outs = ("Connection timed out. Please check the client's " +
                    "permission and connection.")
    return ret, outbuf, outs


def new_style_command(parsed_args,
                      cmdargs,
                      target,
                      sigdict,
                      inbuf, verbose) -> Tuple[int, bytes, str]:
    """
    Do new-style command dance.
    target: daemon to receive command: mon (any) or osd.N
    sigdict - the parsed output from the new monitor describing commands
    inbuf - any -i input file data
    verbose - bool
    """
    if verbose:
        for cmdtag in sorted(sigdict.keys()):
            cmd = sigdict[cmdtag]
            sig = cmd['sig']
            print('{0}: {1}'.format(cmdtag, concise_sig(sig)))

    if cmdargs:
        # Non interactive mode
        ret, outbuf, outs = do_command(parsed_args, target, cmdargs, sigdict, inbuf, verbose)
    else:
        # Interactive mode (ceph cli)
        if sys.stdin.isatty():
            # do the command-interpreter looping
            # for input to do readline cmd editing
            import readline  # noqa

        while True:
            try:
                interactive_input = read_input()
            except EOFError:
                # leave user an uncluttered prompt
                return 0, b'\n', ''
            if interactive_input is None:
                return 0, b'', ''
            cmdargs = parse_cmdargs(shlex.split(interactive_input))[2]
            try:
                target = find_cmd_target(cmdargs)
            except Exception as e:
                print('error handling command target: {0}'.format(e),
                      file=sys.stderr)
                continue
            if len(cmdargs) and cmdargs[0] == 'tell':
                print('Can not use \'tell\' in interactive mode.',
                      file=sys.stderr)
                continue
            ret, outbuf, outs = do_command(parsed_args, target, cmdargs,
                                           sigdict, inbuf, verbose)
            if ret < 0:
                ret = -ret
                errstr = errno.errorcode.get(ret, 'Unknown')
                print('Error {0}: {1}'.format(errstr, outs), file=sys.stderr)
            else:
                if outs:
                    print(outs, file=sys.stderr)
                if outbuf:
                    print(outbuf.decode('utf-8'))

    return ret, outbuf, outs


def complete(sigdict, args, target):
    """
    Command completion.  Match as much of [args] as possible,
    and print every possible match separated by newlines.
    Return exitcode.
    """
    # XXX this looks a lot like the front of validate_command().  Refactor?

    # Repulsive hack to handle tell: lop off 'tell' and target
    # and validate the rest of the command.  'target' is already
    # determined in our callers, so it's ok to remove it here.
    if len(args) and args[0] == 'tell':
        args = args[2:]
    # look for best match, accumulate possibles in bestcmds
    # (so we can maybe give a more-useful error message)

    match_count = 0
    comps = []
    for cmdtag, cmd in sigdict.items():
        flags = cmd.get('flags', 0)
        if flags & (Flag.OBSOLETE | Flag.HIDDEN):
            continue
        sig = cmd['sig']
        j = 0
        # iterate over all arguments, except last one
        for arg in args[0:-1]:
            if j > len(sig)-1:
                # an out of argument definitions
                break
            found_match = arg in sig[j].complete(arg)
            if not found_match and sig[j].req:
                # no elements that match
                break
            if not sig[j].N:
                j += 1
        else:
            # successfully matched all - except last one - arguments
            if j < len(sig) and len(args) > 0:
                comps += sig[j].complete(args[-1])

            match_count += 1
            match_cmd = cmd

    if match_count == 1 and len(comps) == 0:
        # only one command matched and no hints yet => add help
        comps = comps + [' ', '#'+match_cmd['help']]
    print('\n'.join(sorted(set(comps))))
    return 0


def ping_monitor(cluster_handle, name, timeout):
    if 'mon.' not in name:
        print('"ping" expects a monitor to ping; try "ping mon.<id>"', file=sys.stderr)
        return 1

    mon_id = name[len('mon.'):]
    if mon_id == '*':
        run_in_thread(cluster_handle.connect, timeout=timeout)
        for m in monids():
            s = run_in_thread(cluster_handle.ping_monitor, m)
            if s is None:
                print("mon.{0}".format(m) + '\n' + "Error connecting to monitor.")
            else:
                print("mon.{0}".format(m) + '\n' + s)
    else:
            s = run_in_thread(cluster_handle.ping_monitor, mon_id)
            print(s)
    return 0


def get_admin_socket(parsed_args, name):
    path = ceph_conf(parsed_args, 'admin_socket', name)
    try:
        if stat.S_ISSOCK(os.stat(path).st_mode):
            return path
    except OSError:
        pass
    # try harder, probably the "name" option is in the form of
    # "${name}.${pid}"?
    parts = name.rsplit('.', 1)
    if len(parts) > 1 and parts[-1].isnumeric():
        name, pid = parts
        return ceph_conf(parsed_args, 'admin_socket', name, pid)
    else:
        return path


def maybe_daemon_command(parsed_args, childargs):
    """
    Check if --admin-socket, daemon, or daemonperf command
    if it is, returns (boolean handled, return code if handled == True)
    """

    daemon_perf = False
    sockpath = None
    if parsed_args.admin_socket:
        sockpath = parsed_args.admin_socket
    elif len(childargs) > 0 and childargs[0] in ["daemon", "daemonperf"]:
        daemon_perf = (childargs[0] == "daemonperf")
        # Treat "daemon <path>" or "daemon <name>" like --admin_daemon <path>
        # Handle "daemonperf <path>" the same but requires no trailing args
        require_args = 2 if daemon_perf else 3
        if len(childargs) >= require_args:
            if childargs[1].find('/') >= 0:
                sockpath = childargs[1]
            else:
                # try resolve daemon name
                try:
                    sockpath = get_admin_socket(parsed_args, childargs[1])
                except Exception as e:
                    print('Can\'t get admin socket path: ' + str(e), file=sys.stderr)
                    return True, errno.EINVAL
            # for both:
            childargs = childargs[2:]
        else:
            print('{0} requires at least {1} arguments'.format(childargs[0], require_args),
                  file=sys.stderr)
            return True, errno.EINVAL

    if sockpath and daemon_perf:
        return True, daemonperf(childargs, sockpath)
    elif sockpath:
        try:
            raw_write(admin_socket(sockpath, childargs, parsed_args.output_format))
        except Exception as e:
            print('admin_socket: {0}'.format(e), file=sys.stderr)
            return True, errno.EINVAL
        return True, 0

    return False, 0


def isnum(s):
    try:
        float(s)
        return True
    except ValueError:
        return False


def daemonperf(childargs: Sequence[str], sockpath: str):
    """
    Handle daemonperf command; returns errno or 0

    daemonperf <daemon> [priority string] [statpats] [interval] [count]
    daemonperf <daemon> list|ls [statpats]
    """

    interval = 1
    count = None
    statpats = None
    priority = None
    do_list = False

    def prio_from_name(arg):

        PRIOMAP = {
            'critical': PRIO_CRITICAL,
            'interesting': PRIO_INTERESTING,
            'useful': PRIO_USEFUL,
            'uninteresting': PRIO_UNINTERESTING,
            'debugonly': PRIO_DEBUGONLY,
        }

        if arg in PRIOMAP:
            return PRIOMAP[arg]
        # allow abbreviation
        for name, val in PRIOMAP.items():
            if name.startswith(arg):
                return val
        return None

    # consume and analyze non-numeric args
    while len(childargs) and not isnum(childargs[0]):
        arg = childargs.pop(0)
        # 'list'?
        if arg in ['list', 'ls']:
            do_list = True
            continue
        # prio?
        prio = prio_from_name(arg)
        if prio is not None:
            priority = prio
            continue
        # statpats
        statpats = arg.split(',')

    if priority is None:
        priority = PRIO_DEFAULT

    if len(childargs) > 0:
        try:
            interval = float(childargs.pop(0))
            if interval < 0:
                raise ValueError
        except ValueError:
            print('daemonperf: interval should be a positive number', file=sys.stderr)
            return errno.EINVAL

    if len(childargs) > 0:
        arg = childargs.pop(0)
        if (not isnum(arg)) or (int(arg) < 0):
            print('daemonperf: count should be a positive integer', file=sys.stderr)
            return errno.EINVAL
        count = int(arg)

    watcher = DaemonWatcher(sockpath, statpats, priority)
    if do_list:
        watcher.list()
    else:
        watcher.run(interval, count)

    return 0


def get_scrub_timestamps(childargs: Sequence[str]) -> Dict[str,
                                                           Tuple[str, str]]:
    last_scrub_stamp = "last_" + childargs[1].replace('-', '_') + "_stamp"
    results = dict()
    scruball = False
    if childargs[2] in ['all', 'any', '*']:
        scruball = True
    devnull = open(os.devnull, 'w')
    out = subprocess.check_output(['ceph', 'pg', 'dump', '--format=json-pretty'],
                                  stderr=devnull)
    try:
        pgstats = json.loads(out)['pg_map']['pg_stats']
    except KeyError:
        pgstats = json.loads(out)['pg_stats']
    for stat in pgstats:
        if scruball or stat['up_primary'] == int(childargs[2]):
            scrub_tuple = (stat['up_primary'], stat[last_scrub_stamp])
            results[stat['pgid']] = scrub_tuple
    return results


def check_scrub_stamps(waitdata, currdata):
    for pg in waitdata.keys():
       # Try to handle the case where a pg may not exist in current results
       if pg in currdata and waitdata[pg][1] == currdata[pg][1]:
           return False
    return True


def waitscrub(childargs, waitdata):
    print('Waiting for {0} to complete...'.format(childargs[1]), file=sys.stdout)
    currdata = get_scrub_timestamps(childargs)
    while not check_scrub_stamps(waitdata, currdata):
        time.sleep(3)
        currdata = get_scrub_timestamps(childargs)
    print('{0} completed'.format(childargs[1]), file=sys.stdout)


def wait(childargs: Sequence[str], waitdata):
    if childargs[1] in ['scrub', 'deep-scrub']:
        waitscrub(childargs, waitdata)


def main():
    ceph_args = os.environ.get('CEPH_ARGS')
    if ceph_args:
        if "injectargs" in sys.argv:
            i = sys.argv.index("injectargs")
            sys.argv = sys.argv[:i] + ceph_args.split() + sys.argv[i:]
        else:
            sys.argv.extend([arg for arg in ceph_args.split()
                             if '--admin-socket' not in arg])
    parser, parsed_args, childargs = parse_cmdargs()

    if parsed_args.version:
        print('ceph version {0} ({1}) {2} ({3})'.format(
            CEPH_GIT_NICE_VER,
            CEPH_GIT_VER,
            CEPH_RELEASE_NAME,
            CEPH_RELEASE_TYPE))  # noqa
        return 0

    # --watch-channel|-W implies -w
    if parsed_args.watch_channel:
        parsed_args.watch = True
    elif parsed_args.watch and not parsed_args.watch_channel:
        parsed_args.watch_channel = 'cluster'

    global verbose
    verbose = parsed_args.verbose

    if verbose:
        print("parsed_args: {0}, childargs: {1}".format(parsed_args, childargs), file=sys.stderr)

    # pass on --id, --name, --conf
    name = 'client.admin'
    if parsed_args.client_id:
        name = 'client.' + parsed_args.client_id
    if parsed_args.client_name:
        name = parsed_args.client_name

    conffile = rados.Rados.DEFAULT_CONF_FILES
    if parsed_args.cephconf:
        conffile = parsed_args.cephconf
    # For now, --admin-daemon is handled as usual.  Try it
    # first in case we can't connect() to the cluster

    done, ret = maybe_daemon_command(parsed_args, childargs)
    if done:
        return ret

    timeout = None
    if parsed_args.cluster_timeout:
        timeout = parsed_args.cluster_timeout

    # basic help
    if parsed_args.help:
        do_basic_help(parser, childargs)

    # handle any 'generic' ceph arguments that we didn't parse here
    global cluster_handle

    # rados.Rados() will call rados_create2, and then read the conf file,
    # and then set the keys from the dict.  So we must do these
    # "pre-file defaults" first (see common_preinit in librados)
    conf_defaults = {
        'log_to_stderr': 'true',
        'err_to_stderr': 'true',
        'log_flush_on_exit': 'true',
    }

    if 'injectargs' in childargs:
        position = childargs.index('injectargs')
        injectargs = childargs[position:]
        childargs = childargs[:position]
        if verbose:
            print('Separate childargs {0} from injectargs {1}'.format(childargs, injectargs),
                  file=sys.stderr)
    else:
        injectargs = None

    clustername = None
    if parsed_args.cluster:
        clustername = parsed_args.cluster

    try:
        cluster_handle = run_in_thread(rados.Rados,
                                       name=name, clustername=clustername,
                                       conf_defaults=conf_defaults,
                                       conffile=conffile)
        retargs = run_in_thread(cluster_handle.conf_parse_argv, childargs)
    except rados.Error as e:
        print('Error initializing cluster client: {0!r}'.format(e), file=sys.stderr)
        return 1

    childargs = retargs
    if not childargs:
        childargs = []

    # -- means "stop parsing args", but we don't want to see it either
    if '--' in childargs:
        childargs.remove('--')
    if injectargs and '--' in injectargs:
        injectargs.remove('--')

    block = False
    waitdata = dict()
    if parsed_args.block:
        if (len(childargs) >= 2 and
                childargs[0] == 'osd' and
                childargs[1] in ['deep-scrub', 'scrub']):
            block = True
            waitdata = get_scrub_timestamps(childargs)

    if parsed_args.help:
        # short default timeout for -h
        if not timeout:
            timeout = 5

    if childargs and childargs[0] == 'ping' and not parsed_args.help:
        if len(childargs) < 2:
            print('"ping" requires a monitor name as argument: "ping mon.<id>"', file=sys.stderr)
            return 1
    if parsed_args.completion:
        # for completion let timeout be really small
        timeout = 3
    try:
        if childargs and childargs[0] == 'ping' and not parsed_args.help:
            return ping_monitor(cluster_handle, childargs[1], timeout)
        result = run_in_thread(cluster_handle.connect, timeout=timeout)
        if type(result) is tuple and result[0] == -errno.EINTR:
            print('Cluster connection interrupted or timed out', file=sys.stderr)
            return 1
    except KeyboardInterrupt:
        print('Cluster connection aborted', file=sys.stderr)
        return 1
    except rados.PermissionDeniedError as e:
        print(str(e), file=sys.stderr)
        return errno.EACCES
    except Exception as e:
        print(str(e), file=sys.stderr)
        return 1

    if parsed_args.help:
        target = None
        if len(childargs) >= 2 and childargs[0] == 'tell':
            target = childargs[1].split('.', 1)
            if not validate_target(target):
                print('target {0} doesn\'t exist; please pass correct target to tell command (e.g., mon.a, osd.1, mds.a, mgr)'.format(childargs[1]), file=sys.stderr)
                return 1
            childargs = childargs[2:]
            hdr('Tell %s commands:' % target[0])
        else:
            hdr('Monitor commands:')
            target = ('mon', '')
        if verbose:
            print('[Contacting monitor, timeout after %d seconds]' % timeout)

        return do_extended_help(parser, childargs, target, ' '.join(childargs))

    # implement "tell service.id help"
    if len(childargs) >= 3 and childargs[0] == 'tell' and childargs[2] == 'help':
        target = childargs[1].split('.', 1)
        if validate_target(target):
            hdr('Tell %s commands' % target[0])
            return do_extended_help(parser, childargs, target, None)
        else:
            print('target {0} doesn\'t exists, please pass correct target to tell command, such as mon.a/'
                  'osd.1/mds.a/mgr'.format(childargs[1]), file=sys.stderr)
            return 1

    # implement -w/--watch_*
    # This is ugly, but Namespace() isn't quite rich enough.
    level = ''
    for k, v in parsed_args._get_kwargs():
        if k.startswith('watch') and v:
            if k == 'watch':
                level = 'info'
            elif k != "watch_channel":
                level = k.replace('watch_', '')
    if level:
        # an awfully simple callback
        def watch_cb(arg, line, channel, name, who, stamp_sec, stamp_nsec, seq, level, msg):
            # Filter on channel
            channel = channel.decode('utf-8')
            if parsed_args.watch_channel in (channel, '*'):
                print(line.decode('utf-8'))
                sys.stdout.flush()

        # first do a ceph status
        ret, outbuf, outs = json_command(cluster_handle, prefix='status')
        if ret:
            print("status query failed: ", outs, file=sys.stderr)
            return ret
        print(outbuf.decode('utf-8'))

        # this instance keeps the watch connection alive, but is
        # otherwise unused
        run_in_thread(cluster_handle.monitor_log2, level, watch_cb, 0)

        # loop forever letting watch_cb print lines
        try:
            signal.pause()
        except KeyboardInterrupt:
            # or until ^C, at least
            return 0

    # read input file, if any
    inbuf = b''
    if parsed_args.input_file:
        try:
            if parsed_args.input_file == '-':
                inbuf = sys.stdin.buffer.read()
            else:
                with open(parsed_args.input_file, 'rb') as f:
                    inbuf = f.read()
        except Exception as e:
            print('Can\'t open input file {0}: {1}'.format(parsed_args.input_file, e), file=sys.stderr)
            return 1

    # prepare output file, if any
    if parsed_args.output_file:
        try:
            if parsed_args.output_file == '-':
                outf = sys.stdout.buffer
            else:
                outf = open(parsed_args.output_file, 'wb')
        except Exception as e:
            print('Can\'t open output file {0}: {1}'.format(parsed_args.output_file, e), file=sys.stderr)
            return 1
        if parsed_args.setuser:
            try:
                ownerid = pwd.getpwnam(parsed_args.setuser).pw_uid
                os.fchown(outf.fileno(), ownerid, -1)
            except OSError as e:
                print('Failed to change user ownership of {0} to {1}: {2}'.format(outf, parsed_args.setuser, e))
                return 1
        if parsed_args.setgroup:
            try:
                groupid = grp.getgrnam(parsed_args.setgroup).gr_gid
                os.fchown(outf.fileno(), -1, groupid)
            except OSError as e:
                print('Failed to change group ownership of {0} to {1}: {2}'.format(outf, parsed_args.setgroup, e))
                return 1

    # -s behaves like a command (ceph status).
    if parsed_args.status:
        childargs.insert(0, 'status')

    try:
        target = find_cmd_target(childargs)
    except Exception as e:
        print('error handling command target: {0}'.format(e), file=sys.stderr)
        return 1

    # Repulsive hack to handle tell: lop off 'tell' and target
    # and validate the rest of the command.  'target' is already
    # determined in our callers, so it's ok to remove it here.
    is_tell = False
    if len(childargs) and childargs[0] == 'tell':
        childargs = childargs[2:]
        is_tell = True

    if is_tell:
        if injectargs:
            childargs = injectargs
        if not len(childargs):
            print('"{0} tell" requires additional arguments.'.format(sys.argv[0]),
                  'Try "{0} tell <name> <command> [options...]" instead.'.format(sys.argv[0]),
                  file=sys.stderr)
            return errno.EINVAL

    # fetch JSON sigs from command
    # each line contains one command signature (a placeholder name
    # of the form 'cmdNNN' followed by an array of argument descriptors)
    # as part of the validated argument JSON object

    if target[1] == '*':
        service = target[0]
        targets = [(service, o) for o in ids_by_service(service)]
    else:
        targets = [target]

    final_ret = 0
    for target in targets:
        # prettify?  prefix output with target, if there was a wildcard used
        prefix = ''
        suffix = ''
        if not parsed_args.output_file and len(targets) > 1:
            prefix = '{0}.{1}: '.format(*target)
            suffix = '\n'

        ret, outbuf, outs = json_command(cluster_handle, target=target,
                                         prefix='get_command_descriptions')
        if ret:
            where = '{0}.{1}'.format(*target)
            if ret > 0:
                raise RuntimeError('Unexpected return code from {0}: {1}'.
                                   format(where, ret))
            outs = 'problem getting command descriptions from {0}'.format(where)
        else:
            sigdict = parse_json_funcsigs(outbuf.decode('utf-8'), 'cli')

            if parsed_args.completion:
                return complete(sigdict, childargs, target)

            ret, outbuf, outs = new_style_command(parsed_args, childargs,
                                                  target, sigdict, inbuf,
                                                  verbose)

            # debug tool: send any successful command *again* to
            # verify that it is idempotent.
            if not ret and 'CEPH_CLI_TEST_DUP_COMMAND' in os.environ:
                ret, outbuf, outs = new_style_command(parsed_args, childargs,
                                                      target, sigdict, inbuf,
                                                      verbose)
                if ret < 0:
                    ret = -ret
                    print(prefix +
                          'Second attempt of previously successful command '
                          'failed with {0}: {1}'.format(
                              errno.errorcode.get(ret, 'Unknown'), outs),
                          file=sys.stderr)

        sys.stdout.flush()

        if parsed_args.output_file:
            outf.write(outbuf)
        else:
            # hack: old code printed status line before many json outputs
            # (osd dump, etc.) that consumers know to ignore.  Add blank line
            # to satisfy consumers that skip the first line, but not annoy
            # consumers that don't.
            if parsed_args.output_format and \
               parsed_args.output_format.startswith('json'):
                print()

            # if we are prettifying things, normalize newlines.  sigh.
            if suffix:
                outbuf = outbuf.rstrip()
            if outbuf:
                try:
                    print(prefix, end='')
                    # Write directly to binary stdout
                    raw_write(outbuf)
                    print(suffix, end='')
                except IOError as e:
                    if e.errno != errno.EPIPE:
                        raise e
        final_e = None
        try:
            sys.stdout.flush()
        except IOError as e:
            if e.errno != errno.EPIPE:
                final_e = e

        if ret < 0:
            ret = -ret
            errstr = errno.errorcode.get(ret, 'Unknown')
            print('Error {0}: {1}'.format(errstr, outs), file=sys.stderr)
            final_ret = ret
        elif outs:
            print(prefix + outs, file=sys.stderr)

        if final_e:
            raise final_e

    # Block until command completion (currently scrub and deep_scrub only)
    if block:
        wait(childargs, waitdata)

    if parsed_args.output_file and parsed_args.output_file != '-':
        outf.close()

    if final_ret:
        return final_ret

    return 0

if __name__ == '__main__':
    try:
        retval = main()
        # shutdown explicitly; Rados() does not
        if retval == 0 and cluster_handle:
            run_in_thread(cluster_handle.shutdown)
    except KeyboardInterrupt:
        print('Interrupted')
        retval = errno.EINTR

    if retval:
        # flush explicitly because we aren't exiting in the usual way
        sys.stdout.flush()
        sys.stderr.flush()
        os._exit(retval)
    else:
        sys.exit(retval)