supervisor / CHANGES.txt

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
Next release

  - Import iterparse from xml.etree when available (eg: Python 2.6).  Patch
    by Sidnei da Silva.

  - Fixed the url to the supervisor-users mailing list.  Patch by
    Sidnei da Silva

  - When parsing "environment=" in the config file, changes introduced in
    3.0a8 prevented Supervisor from parsing some characters commonly
    found in paths unless quoting was used as in this example:
    
      environment=HOME='/home/auser'
    
    Supervisor once again allows the above line to be written as:
    
      environment=HOME=/home/auser

    Alphanumeric characters, "_", "/", ".", "+", "-", "(", ")", and ":" can all 
    be used as a value without quoting. If any other characters are needed in 
    the value, please quote it as in the first example above.  Thanks to Paul 
    Heideman for reporting this issue.

  - Supervisor will now look for its config file in locations relative to the
    executable path, allowing it to be used more easily in virtual 
    environments.  If sys.argv[0] is '/path/to/venv/bin/supervisorctl', 
    supervisor will now look for it's config file in 
    '/path/to/venv/etc/supervisord.conf' and '/path/to/venv/supervisord.conf'
    in addition to the other standard locations.  Patch by Chris Rossi.

3.0a8 (2010-01-20)

  - Don't cleanup file descriptors on first supervisord invocation:
    this is a lame workaround for Snow Leopard systems that use
    libdispatch and are receiving "Illegal instruction" messages at
    supervisord startup time.  Restarting supervisord via
    "supervisorctl restart" may still cause a crash on these systems.

  - Got rid of Medusa hashbang headers in various files to ease RPM
    packaging.

  - Allow umask to be 000 (patch contributed by Rowan Nairn).

  - Fixed a bug introduced in 3.0a7 where supervisorctl wouldn't ask
    for a username/password combination properly from a
    password-protected supervisord if it wasn't filled in within the
    "[supervisorctl]" section username/password values.  It now
    properly asks for a username and password.

  - Fixed a bug introduced in 3.0a7 where setup.py would not detect the
    Python version correctly.  Patch by Daniele Paolella.

  - Fixed a bug introduced in 3.0a7 where parsing a string of key/value
    pairs failed on Python 2.3 due to use of regular expression syntax
    introduced in Python 2.4.

  - Removed the test suite for the ``memmon`` console script, which was 
    moved to the Superlance package in 3.0a7.

  - Added release dates to CHANGES.txt.

  - Reloading the config for an fcgi process group did not close the fcgi
    socket - now, the socket is closed whenever the group is stopped as a unit
    (including during config update). However, if you stop all the processes
    in a group individually, the socket will remain open to allow for graceful
    restarts of FCGI daemons.  (Roger Hoover)

  - Rereading the config did not pick up changes to the socket parameter in a
    fcgi-program section.  (Roger Hoover)

  - Made a more friendly exception message when a FCGI socket cannot be
    created.  (Roger Hoover)

  - Fixed a bug where the --serverurl option of supervisorctl would not
    accept a URL with a "unix" scheme.  (Jason Kirtland)

  - Running the tests now requires the "mock" package.  This dependency has 
    been added to "tests_require" in setup.py.  (Roger Hoover)

  - Added support for setting the ownership and permissions for an FCGI socket.
    This is done using new "socket_owner" and "socket_mode" options in an
    [fcgi-program:x] section.  See the manual for details.  (Roger Hoover)
    
  - Fixed a bug where the FCGI socket reference count was not getting 
    decremented on spawn error.  (Roger Hoover)

  - Fixed a Python 2.6 deprecation warning on use of the "sha" module.

  - Updated ez_setup.py to one that knows about setuptools 0.6c11.

  - Running "supervisorctl shutdown" no longer dumps a Python backtrace
    when it can't connect to supervisord on the expected socket.  Thanks
    to Benjamin Smith for reporting this.

  - Removed use of collections.deque in our bundled version of asynchat
    because it broke compatibility with Python 2.3.

  - The sample configuration output by "echo_supervisord_conf" now correctly
    shows the default for "autorestart" as "unexpected".  Thanks to
    William Dode for noticing it showed the wrong value.

3.0a7 (2009-05-24)
 
  - We now bundle our own patched version of Medusa contributed by Jason
    Kirtland to allow Supervisor to run on Python 2.6.  This was done 
    because Python 2.6 introduced backwards incompatible changes to 
    asyncore and asynchat in the stdlib.
  
  - The console script ``memmon``, introduced in Supervisor 3.0a4, has
    been moved to Superlance (http://pypi.python.org/pypi/superlance).  
    The Superlance package contains other useful monitoring tools designed
    to run under Supervisor.    

  - Supervisorctl now correctly interprets all of the error codes that can
    be returned when starting a process.  Patch by Francesc Alted.

  - New 'stdout_events_enabled' and 'stderr_events_enabled' config options
    have been added to the '[program:x]', '[fcgi-program:x]', and 
    '[eventlistener:x]' sections.  These enable the emitting of new 
    PROCESS_LOG events for a program.  If unspecified, the default is False.

    If enabled for a subprocess, and data is received from the stdout or
    stderr of the subprocess while not in the special capture mode used by 
    PROCESS_COMMUNICATION, an event will be emitted.

    Event listeners can subscribe to either PROCESS_LOG_STDOUT or 
    PROCESS_LOG_STDERR individually, or PROCESS_LOG for both.

  - Values for subprocess environment variables specified with environment=
    in supervisord.conf can now be optionally quoted, allowing them to 
    contain commas.  Patch by Tim Godfrey.

  - Added a new event type, REMOTE_COMMUNICATION, that is emitted by a new
    RPC method, supervisor.sendRemoteCommEvent().

  - Patch for bug #268 (KeyError on 'here' expansion for stdout/stderr_logfile)
    from David E. Kindred.

  - Add ``reread``, ``update``, and ``avail`` commands based on Anders
    Quist's ``online_config_reload.diff`` patch.  This patch extends
    the "add" and "drop" commands with automagical behavior::

      In supervisorctl:

        supervisor> status
        bar                              RUNNING    pid 14864, uptime 18:03:42
        baz                              RUNNING    pid 23260, uptime 0:10:16
        foo                              RUNNING    pid 14866, uptime 18:03:42
        gazonk                           RUNNING    pid 23261, uptime 0:10:16
        supervisor> avail
        bar                              in use    auto      999:999
        baz                              in use    auto      999:999
        foo                              in use    auto      999:999
        gazonk                           in use    auto      999:999
        quux                             avail     auto      999:999

      Now we add this to our conf:

        [group:zegroup]
        programs=baz,gazonk

      Then we reread conf:

        supervisor> reread
        baz: disappeared
        gazonk: disappeared
        quux: available
        zegroup: available
        supervisor> avail
        bar                              in use    auto      999:999
        foo                              in use    auto      999:999
        quux                             avail     auto      999:999
        zegroup:baz                      avail     auto      999:999
        zegroup:gazonk                   avail     auto      999:999
        supervisor> status
        bar                              RUNNING    pid 14864, uptime 18:04:18
        baz                              RUNNING    pid 23260, uptime 0:10:52
        foo                              RUNNING    pid 14866, uptime 18:04:18
        gazonk                           RUNNING    pid 23261, uptime 0:10:52

      The magic make-it-so command:

        supervisor> update
        baz: stopped
        baz: removed process group
        gazonk: stopped
        gazonk: removed process group
        zegroup: added process group
        quux: added process group
        supervisor> status
        bar                              RUNNING    pid 14864, uptime 18:04:43
        foo                              RUNNING    pid 14866, uptime 18:04:43
        quux                             RUNNING    pid 23561, uptime 0:00:02
        zegroup:baz                      RUNNING    pid 23559, uptime 0:00:02
        zegroup:gazonk                   RUNNING    pid 23560, uptime 0:00:02
        supervisor> avail
        bar                              in use    auto      999:999
        foo                              in use    auto      999:999
        quux                             in use    auto      999:999
        zegroup:baz                      in use    auto      999:999
        zegroup:gazonk                   in use    auto      999:999

  - Fix bug with symptom "KeyError: 'process_name'" when using a logfile name 
    including documented 'process_name' Python string expansions.

  - Tab completions in the supervisorctl shell, and a foreground mode
    for Supervisor, implemented as a part of GSoC.
    The supervisorctl program now has a 'fg' command, which makes it
    possible to supply inputs to a process, and see its output/error
    stream in real time.

  - Process config reloading implemented by Anders Quist.  The
    supervisorctl program now has the commands "add" and "drop".
    "add <programname>" adds the process group implied by <programname>
    in the config file.  "drop <programname>" removes the process
    group from the running configuration (it must already be stopped).
    This makes it possible to add processes to and remove processes from
    a running supervisord without restarting the supervisord process.

  - Fixed a bug where opening the HTTP servers would fail silently
    for socket errors other than errno.EADDRINUSE.

  - Thanks to Dave Peticolas, using "reload" against a supervisord
    that is running in the background no longer causes supervisord
    to crash.

  - Configuration options for logfiles now accept mixed case reserved 
    words (e.g. "AUTO" or "auto") for consistency with other options.

  - childutils.eventdata was buggy, it could not deal with carriage returns
    in data.  See http://www.plope.com/software/collector/257.  Thanks
    to Ian Bicking.

  - Per-process exitcodes= configuration now will not accept exit
    codes that are not 8-bit unsigned integers (supervisord will not 
    start when one of the exit codes is outside the range of 0 - 255).

  - Per-process 'directory' value can now contain expandable values
    like %(here)s. (See http://www.plope.com/software/collector/262).

  - Accepted patch from Roger Hoover to allow for a new sort of
    process group: "fcgi-program".  Adding one of these to your
    supervisord.conf allows you to control fastcgi programs.  FastCGI
    programs cannot belong to heterogenous groups.

    The configuration for FastCGI programs is the same as regular
    programs except an additional "socket" parameter.  Substitution
    happens on the socket parameter with the 'here' and 'program_name'
    variables::

     [fcgi-program:fcgi_test]
     ;socket=tcp://localhost:8002
     socket=unix:///path/to/fcgi/socket

  - Supervisorctl now supports a plugin model for supervisorctl
    commands.

  - Added the ability to retrieve supervisord's own pid through
    supervisor.getPID() on the XML-RPC interface or a new
    "pid" command on supervisorctl.

3.0a6 (2008-04-07)

  - The RotatingFileLogger had a race condition in its doRollover
    method whereby a file might not actually exist despite a call to
    os.path.exists on the line above a place where we try to remove
    it.  We catch the exception now and ignore the missing file.

3.0a5 (2008-03-13)

  - Supervisorctl now supports persistent readline history.  To
    enable, add "history_file = <pathname>" to the '[supervisorctl']
    section in your supervisord.conf file.

  - Multiple commands may now be issued on one supervisorctl command
    line, e.g. "restart prog; tail -f prog".  Separate commands with a
    single semicolon; they will be executed in order as you would
    expect.

3.0a4 (2008-01-30)

  - 3.0a3 broke Python 2.3 backwards compatibility.

  - On Debian Sarge, one user reported that a call to
    options.mktempfile would fail with an "[Errno 9] Bad file
    descriptor" at supervisord startup time.  I was unable to
    reproduce this, but we found a workaround that seemed to work for
    him and it's included in this release.  See
    http://www.plope.com/software/collector/252 for more information.
    Thanks to William Dode.

  - The fault ALREADY_TERMINATED has been removed.  It was only 
    raised by supervisor.sendProcessStdin().  That method now returns 
    NOT_RUNNING for parity with the other methods. (Mike Naberezny)

  - The fault TIMED_OUT has been removed.  It was not used.

  - Supervisor now depends on meld3 0.6.4, which does not compile its
    C extensions by default, so there is no more need to faff around
    with NO_MELD3_EXTENSION_MODULES during installation if you don't
    have a C compiler or the Python development libraries on your
    system.

  - Instead of making a user root around for the sample.conf file,
    provide a convenience command "echo_supervisord_conf", which he can
    use to echo the sample.conf to his terminal (and redirect to a file 
    appropriately).  This is a new user convenience (especially one who
    has no Python experience).

  - Added 'numprocs_start' config option to '[program:x]' and
    '[eventlistener:x]' sections.  This is an offset used to compute
    the first integer that 'numprocs' will begin to start from.
    Contributed by Antonio Beamud Montero.

  - Added capability for '[include]' config section to config format.
    This section must contain a single key "files", which must name a
    space-separated list of file globs that will be included in
    supervisor's configuration.  Contributed by Ian Bicking.

  - Invoking the 'reload' supervisorctl command could trigger a bug in
    supervisord which caused it to crash.  See
    http://www.plope.com/software/collector/253 .  Thanks to William
    Dode for a bug report.

  - The 'pidproxy' script was made into a console script.

  - The 'password' value in both the '[inet_http_server]' and
    '[unix_http_server]' sections can now optionally be specified as a
    SHA hexdigest instead of as cleartext.  Values prefixed with
    '{SHA}' will be considered SHA hex digests.  To encrypt a password
    to a form suitable for pasting into the configuration file using
    Python, do, e.g.:

       >>> import sha
       >>> '{SHA}' + sha.new('thepassword').hexdigest()
       '{SHA}82ab876d1387bfafe46cc1c8a2ef074eae50cb1d'

  - The subtypes of the events PROCESS_STATE_CHANGE (and
    PROCESS_STATE_CHANGE itself) have been removed, replaced with a
    simpler set of PROCESS_STATE subscribable event types.

    The new event types are:

      PROCESS_STATE_STOPPED
      PROCESS_STATE_EXITED
      PROCESS_STATE_STARTING
      PROCESS_STATE_STOPPING
      PROCESS_STATE_BACKOFF
      PROCESS_STATE_FATAL
      PROCESS_STATE_RUNNING
      PROCESS_STATE_UNKNOWN
      PROCESS_STATE # abstract

    PROCESS_STATE_STARTING replaces:

      PROCESS_STATE_CHANGE_STARTING_FROM_STOPPED
      PROCESS_STATE_CHANGE_STARTING_FROM_BACKOFF
      PROCESS_STATE_CHANGE_STARTING_FROM_EXITED
      PROCESS_STATE_CHANGE_STARTING_FROM_FATAL

    PROCESS_STATE_RUNNING replaces
    PROCESS_STATE_CHANGE_RUNNING_FROM_STARTED

    PROCESS_STATE_BACKOFF replaces
    PROCESS_STATE_CHANGE_BACKOFF_FROM_STARTING

    PROCESS_STATE_STOPPING replaces:

      PROCESS_STATE_CHANGE_STOPPING_FROM_RUNNING
      PROCESS_STATE_CHANGE_STOPPING_FROM_STARTING

    PROCESS_STATE_EXITED replaces
    PROCESS_STATE_CHANGE_EXITED_FROM_RUNNING

    PROCESS_STATE_STOPPED replaces
    PROCESS_STATE_CHANGE_STOPPED_FROM_STOPPING

    PROCESS_STATE_FATAL replaces
    PROCESS_STATE_CHANGE_FATAL_FROM_BACKOFF

    PROCESS_STATE_UNKNOWN replaces PROCESS_STATE_CHANGE_TO_UNKNOWN

    PROCESS_STATE replaces PROCESS_STATE_CHANGE

    The PROCESS_STATE_CHANGE_EXITED_OR_STOPPED abstract event is gone.

    All process state changes have at least "processname",
    "groupname", and "from_state" (the name of the previous state) in
    their serializations.

    PROCESS_STATE_EXITED additionaly has "expected" (1 or 0) and "pid"
    (the process id) in its serialization.

    PROCESS_STATE_RUNNING, PROCESS_STATE_STOPPING,
    PROCESS_STATE_STOPPED additionally have "pid" in their
    serializations.

    PROCESS_STATE_STARTING and PROCESS_STATE_BACKOFF have "tries" in
    their serialization (initially "0", bumped +1 each time a start
    retry happens).

  - Remove documentation from README.txt, point people to
    http://supervisord.org/manual/ .

  - The eventlistener request/response protocol has changed.  OK/FAIL
    must now be wrapped in a RESULT envelope so we can use it for more
    specialized communications.

    Previously, to signify success, an event listener would write the
    string 'OK\n' to its stdout.  To signify that the event was seen
    but couldn't be handled by the listener and should be rebuffered,
    an event listener would write the string 'FAIL\n' to its stdout.

    In the new protocol, the listener must write the string:

      RESULT {resultlen}\n{result}

    For example, to signify OK:

      RESULT 2\nOK

    To signify FAIL:

      RESULT 4\nFAIL

    See the scripts/sample_eventlistener.py script for an example.

  - To provide a hook point for custom results returned from event
    handlers (see above) the [eventlistener:x] configuration sections
    now accept a "result_handler=" parameter,
    e.g. "result_handler=supervisor.dispatchers:default_handler" (the
    default) or "handler=mypackage:myhandler".  The keys are pkgutil
    "entry point" specifications (importable Python function names).
    Result handlers must be callables which accept two arguments: one
    named "event" which represents the event, and the other named
    "result", which represents the listener's result.  A result
    handler either executes successfully or raises an exception.  If
    it raises a supervisor.dispatchers.RejectEvent exception, the
    event will be rebuffered, and the eventhandler will be placed back
    into the ACKNOWLEDGED state.  If it raises any other exception,
    the event handler will be placed in the UNKNOWN state.  If it does
    not raise any exception, the event is considered successfully
    processed.  A result handler's return value is ignored.  Writing a
    result handler is a "in case of emergency break glass" sort of
    thing, it is not something to be used for arbitrary business code.
    In particular, handlers *must not block* for any appreciable
    amount of time.

    The 'standard' eventlistener result handler
    (supervisor.dispatchers:default_handler) does nothing if it
    receives an "OK" and will raise a
    supervisor.dispatchers.RejectEvent exception if it receives any
    other value.

  - Supervisord now emits TICK events, which happen every N seconds.
    Three types of TICK events are available: TICK_5 (every five
    seconds), TICK_60 (every minute), TICK_3600 (every hour).  Event
    listeners may subscribe to one of these types of events to perform
    every-so-often processing.  TICK events are subtypes of the EVENT
    type.

 - Get rid of OSX platform-specific memory monitor and replace with
   memmon.py, which works on both Linux and Mac OS.  This script is
   now a console script named "memmon".

 - Allow "web handler" (the handler which receives http requests from 
   browsers visiting the web UI of supervisor) to deal with POST requests.

 - RPC interface methods stopProcess(), stopProcessGroup(), and
   stopAllProcesses() now take an optional "wait" argument that defaults
   to True for parity with the start methods.  

3.0a3 (2007-10-02)

  - Supervisorctl now reports a better error message when the main
    supervisor XML-RPC namespace is not registered.  Thanks to
    Mike Orr for reporting this. (Mike Naberezny)

  - Create 'scripts' directory within supervisor package, move
    'pidproxy.py' there, and place sample event listener and comm
    event programs within the directory.

  - When an event notification is buffered (either because a listener
    rejected it or because all listeners were busy when we attempted
    to send it originally), we now rebuffer it in a way that will
    result in it being retried earlier than it used to be.

  - When a listener process exits (unexpectedly) before transitioning
    from the BUSY state, rebuffer the event that was being processed.

  - supervisorctl 'tail' command now accepts a trailing specifier:
    'stderr' or 'stdout', which respectively, allow a user to tail the
    stderr or stdout of the named process.  When this specifier is not
    provided, tail defaults to stdout.

  - supervisor 'clear' command now clears both stderr and stdout logs
    for the given process.

  - When a process encounters a spawn error as a result of a failed
    execve or when it cannot setuid to a given uid, it now puts this
    info into the process' stderr log rather than its stdout log.

  - The event listener protocol header now contains the 'server'
    identifier, the 'pool' that the event emanated from, and the
    'poolserial' as well as the values it previously contained
    (version, event name, serial, and length).  The server identifier
    is taken from the config file options value 'identifier', the
    'pool' value is the name of the listener pool that this event
    emanates from, and the 'poolserial' is a serial number assigned to
    the event local to the pool that is processing it.

  - The event listener protocol header is now a sequence of key-value
    pairs rather than a list of positional values.  Previously, a
    representative header looked like:

      SUPERVISOR3.0 PROCESS_COMMUNICATION_STDOUT 30 22\n

    Now it looks like:

      ver:3.0 server:supervisor serial:21 ... 

  - Specific event payload serializations have changed.  All event
    types that deal with processes now include the pid of the process
    that the event is describing.  In event serialization "header"
    values, we've removed the space between the header name and the
    value and headers are now separated by a space instead of a line
    feed.  The names of keys in all event types have had underscores
    removed.

  - Abandon the use of the Python stdlib 'logging' module for speed
    and cleanliness purposes.  We've rolled our own.

  - Fix crash on start if AUTO logging is used with a max_bytes of
    zero for a process.

  - Improve process communication event performance.

  - The process config parameters 'stdout_capturefile' and
    'stderr_capturefile' are no longer valid.  They have been replaced
    with the 'stdout_capture_maxbytes' and 'stderr_capture_maxbytes'
    parameters, which are meant to be suffix-multiplied integers.
    They both default to zero.  When they are zero, process
    communication event capturing is not performed.  When either is
    nonzero, the value represents the maximum number of bytes that
    will be captured between process event start and end tags.  This
    change was to support the fact that we no longer keep capture data
    in a separate file, we just use a FIFO in RAM to maintain capture
    info.  For users whom don't care about process communication
    events, or whom haven't changed the defaults for
    'stdout_capturefile' or 'stderr_capturefile', they needn't do
    anything to their configurations to deal with this change.

  - Log message levels have been normalized.  In particular, process
    stdin/stdout is now logged at 'debug' level rather than at 'trace'
    level ('trace' level is now reserved for output useful typically
    for debugging supervisor itself).  See 'Supervisor Log Levels' in
    README.txt for more info.

  - When an event is rebuffered (because all listeners are busy or a
    listener rejected the event), the rebuffered event is now inserted
    in the head of the listener event queue.  This doesn't guarantee
    event emission in natural ordering, because if a listener rejects
    an event or dies while it's processing an event, it can take an
    arbitrary amount of time for the event to be rebuffered, and other
    events may be processed in the meantime.  But if pool listeners
    never reject an event or don't die while processing an event, this
    guarantees that events will be emitted in the order that they were
    received because if all listeners are busy, the rebuffered event
    will be tried again "first" on the next go-around.

  - Removed EVENT_BUFFER_OVERFLOW event type.

  - The supervisorctl xmlrpc proxy can now communicate with
    supervisord using a persistent HTTP connection.

  - A new module "supervisor.childutils" was added.  This module
    provides utilities for Python scripts which act as children of
    supervisord.  Most notably, it contains an API method
    "getRPCInterface" allows you to obtain an xmlrpxlib ServerProxy
    that is willing to communicate with the parent supervisor.  It
    also contains utility functions that allow for parsing of
    supervisor event listener protocol headers.  A pair of scripts
    (loop_eventgen.py and loop_listener.py) were added to the script
    directory that serve as examples about how to use the childutils
    module.

  - A new envvar is added to child process environments:
    SUPERVISOR_SERVER_URL.  This contains the server URL for the
    supervisord running the child.

  - An 'OK' URL was added at /ok.html which just returns the string
    'OK' (can be used for up checks or speed checks via
    plain-old-HTTP).

  - An additional command-line option '--profile_options' is accepted
    by the supervisord script for developer use.

      supervisord -n -c sample.conf --profile_options=cumulative,calls

    The values are sort_stats options that can be passed to the
    standard Python profiler's PStats sort_stats method.

    When you exit supervisor, it will print Python profiling output to
    stdout.

  - If cElementTree is installed in the Python used to invoke
    supervisor, an alternate (faster, by about 2X) XML parser will be
    used to parse XML-RPC request bodies.  cElementTree was added as
    an "extras_require" option in setup.py.

  - Added the ability to start, stop, and restart process groups to
    supervisorctl.  To start a group, use "start groupname:*".  To
    start multiple groups, use "start groupname1:* groupname2:*".
    Equivalent commands work for "stop" and "restart". You can mix and
    match short processnames, fullly-specified group:process names,
    and groupsplats on the same line for any of these commands.

  - Added 'directory' option to process config.  If you set this
    option, supervisor will chdir to this directory before executing
    the child program (and thus it will be the child's cwd).

  - Added 'umask' option to process config.  If you set this option,
    supervisor will set the umask of the child program.  (Thanks to
    Ian Bicking for the suggestion).

  - A pair of scripts "osx_memmon_eventgen.py" and
    "osx_memmon_listener.py" have been added to the scripts directory.
    If they are used together as described in their comments,
    processes which are consuming "too much" memory will be restarted.
    The 'eventgen' script only works on OSX (my main development
    platform) but it should be trivially generalizable to other
    operating systems.

  - The long form "--configuration" (-c) command line option for
    supervisord was broken.  Reported by Mike Orr.  (Mike Naberezny)

  - New log level: BLAT (blather).  We log all
    supervisor-internal-related debugging info here.  Thanks to Mike
    Orr for the suggestion.

  - We now allow supervisor to listen on both a UNIX domain socket and
    an inet socket instead of making them mutually exclusive.  As a
    result, the options "http_port", "http_username", "http_password",
    "sockchmod" and "sockchown" are no longer part of the
    '[supervisord]' section configuration. These have been supplanted
    by two other sections: '[unix_http_server]' and
    '[inet_http_server'].  You'll need to insert one or the other
    (depending on whether you want to listen on a UNIX domain socket
    or a TCP socket respectively) or both into your supervisord.conf
    file.  These sections have their own options (where applicable)
    for port, username, password, chmod, and chown.  See README.txt
    for more information about these sections.

  - All supervisord command-line options related to "http_port",
    "http_username", "http_password", "sockchmod" and "sockchown" have
    been removed (see above point for rationale).

  - The option that *used* to be 'sockchown' within the
    '[supervisord]' section (and is now named 'chown' within the
    '[unix_http_server]' section) used to accept a dot-separated
    user.group value.  The separator now must be a colon ":",
    e.g. "user:group".  Unices allow for dots in usernames, so this
    change is a bugfix.  Thanks to Ian Bicking for the bug report.

  - If a '-c' option is not specified on the command line, both
    supervisord and supervisorctl will search for one in the paths
    './supervisord.conf' , './etc/supervisord.conf' (relative to the
    current working dir when supervisord or supervisorctl is invoked)
    or in '/etc/supervisord.conf' (the old default path).  These paths
    are searched in order, and supervisord and supervisorctl will use
    the first one found.  If none are found, supervisor will fail to
    start.

  - The Python string expression '%(here)s' (referring to the
    directory in which the the configuration file was found) can be
    used within the following sections/options within the config file:

        unix_http_server:file
        supervisor:directory
        supervisor:logfile
        supervisor:pidfile
        supervisor:childlogdir
        supervisor:environment
        program:environment
        program:stdout_logfile
        program:stderr_logfile
        program:process_name
        program:command

  - The '--environment' aka '-b' option was removed from the list of
    available command-line switches to supervisord (use "A=1 B=2
    bin/supervisord" instead).

  - If the socket filename (the tail-end of the unix:// URL) was
    longer than 64 characters, supervisorctl would fail with an
    encoding error at startup.

  - The 'identifier' command-line argument was not functional.

  - Fixed http://www.plope.com/software/collector/215 (bad error
    message in supervisorctl when program command not found on PATH).

  - Some child processes may not have been shut down properly at
    supervisor shutdown time.

  - Move to ZPL-derived (but not ZPL) license availble from
    http://www.repoze.org/LICENSE.txt; it's slightly less restrictive
    than the ZPL (no servicemark clause).

  - Spurious errors related to unclosed files ("bad file descriptor",
    typically) were evident at supervisord "reload" time (when using
    the "reload" command from supervisorctl).

  - We no longer bundle ez_setup to bootstrap setuptools installation.

3.0a2 (2007-08-24)

  - Fixed the README.txt example for defining the supervisor RPC
    interface in the configuration file.  Thanks to Drew Perttula.

  - Fixed a bug where process communication events would not have the
    proper payload if the payload data was very short.

  - when supervisord attempted to kill a process with SIGKILL after
    the process was not killed within "stopwaitsecs" using a "normal"
    kill signal, supervisord would crash with an improper
    AssertionError.  Thanks to Calvin Hendryx-Parker.

  - On Linux, Supervisor would consume too much CPU in an effective
    "busywait" between the time a subprocess exited and the time at
    which supervisor was notified of its exit status.  Thanks to Drew
    Perttula.

  - RPC interface behavior change: if the RPC method
    "sendProcessStdin" is called against a process that has closed its
    stdin file descriptor (e.g. it has done the equivalent of
    "sys.stdin.close(); os.close(0)"), we return a NO_FILE fault
    instead of accepting the data.

  - Changed the semantics of the process configuration 'autorestart'
    parameter with respect to processes which move between the RUNNING
    and EXITED state.  'autorestart' was previously a boolean.  Now
    it's a trinary, accepting one of 'false', 'unexpected', or 'true'.
    If it's 'false', a process will never be automatically restarted
    from the EXITED state.  If it's 'unexpected', a process that
    enters the EXITED state will be automatically restarted if it
    exited with an exit code that was not named in the process
    config's 'exitcodes' list.  If it's 'true', a process that enters
    the EXITED state will be automatically restarted unconditionally.
    The default is now 'unexpected' (it was previously 'true').  The
    readdition of this feature is a reversion of the behavior change
    note in the changelog notes for 3.0a1 that asserted we never cared
    about the process' exit status when determining whether to restart
    it or not.

  - setup.py develop (and presumably setup.py install) would fail
    under Python 2.3.3, because setuptools attempted to import
    'splituser' from urllib2, and it didn't exist.

  - It's now possible to use 'setup.py install' and 'setup.py develop'
    on systems which do not have a C compiler if you set the
    environment variable "NO_MELD3_EXTENSION_MODULES=1" in the shell
    in which you invoke these commands (versions of meld3 > 0.6.1
    respect this envvar and do not try to compile optional C
    extensions when it's set).

  - The test suite would fail on Python versions <= 2.3.3 because
    the "assertTrue" and "assertFalse" methods of unittest.TestCase
    didn't exist in those versions.

  - The 'supervisorctl' and 'supervisord' wrapper scripts were disused
    in favor of using setuptools' 'console_scripts' entry point settings.

  - Documentation files and the sample configuration file are put into
    the generated supervisor egg's 'doc' directory.

  _ Using the web interface would cause fairly dramatic memory
    leakage.  We now require a version of meld3 that does not appear
    to leak memory from its C extensions (0.6.3).

3.0a1 (2007-08-16)

  - Default config file comment documented 10 secs as default for
    'startsecs' value in process config, in reality it was 1 sec.
    Thanks to Christoph Zwerschke.

  - Make note of subprocess environment behavior in README.txt.
    Thanks to Christoph Zwerschke.

  - New "strip_ansi" config file option attempts to strip ANSI escape
    sequences from logs for smaller/more readable logs (submitted by
    Mike Naberezny).

  - The XML-RPC method supervisor.getVersion() has been renamed for 
    clarity to supervisor.getAPIVersion().  The old name is aliased 
    for compatibility but is deprecated and will be removed in a
    future version (Mike Naberezny).

  - Improved web interface styling (Mike Naberezny, Derek DeVries)

  - The XML-RPC method supervisor.startProcess() now checks that
    the file exists and is executable (Mike Naberezny).

  - Two environment variables, "SUPERVISOR_PROCESS_NAME" and
    "SUPERVISOR_PROCESS_GROUP" are set in the environment of child
    processes, representing the name of the process and group in
    supervisor's configuration.

  - Process state map change: a process may now move directly from the
    STARTING state to the STOPPING state (as a result of a stop
    request).

  - Behavior change: if 'autorestart' is true, even if a process exits
    with an "expected" exit code, it will still be restarted.  In the
    immediately prior release of supervisor, this was true anyway, and
    no one complained, so we're going to consider that the "officially
    correct" behavior from now on.

  - Supervisor now logs subprocess stdout and stderr independently.
    The old program config keys "logfile", "logfile_backups" and
    "logfile_maxbytes" are superseded by "stdout_logfile",
    "stdout_logfile_backups", and "stdout_logfile_maxbytes".  Added
    keys include "stderr_logfile", "stderr_logfile_backups", and
    "stderr_logfile_maxbytes".  An additional "redirect_stderr" key is
    used to cause program stderr output to be sent to its stdin
    channel.  The keys "log_stderr" and "log_stdout" have been
    removed.

  - '[program:x]' config file sections now represent "homgeneous
    process groups" instead of single processes.  A "numprocs" key in
    the section represents the number of processes that are in the
    group.  A "process_name" key in the section allows composition of
    the each process' name within the homogeneous group.

  - A new kind of config file section, '[group:x]' now exists,
    allowing users to group heterogeneous processes together into a
    process group that can be controlled as a unit from a client.

  - Supervisord now emits "events" at certain points in its normal
    operation.  These events include supervisor state change events,
    process state change events, and "process communication events".

  - A new kind of config file section '[eventlistener:x]' now exists.
    Each section represents an "event listener pool", which is a
    special kind of homogeneous process group.  Each process in the
    pool is meant to receive supervisor "events" via its stdin and
    perform some notification (e.g. send a mail, log, make an http
    request, etc.)

  - Supervisord can now capture data between special tokens in
    subprocess stdout/stderr output and emit a "process communications
    event" as a result.

  - Supervisor's XML-RPC interface may be extended arbitrarily by
    programmers.  Additional top-level namespace XML-RPC interfaces
    can be added using the '[rpcinterface:foo]' declaration in the
    configuration file.

  - New 'supervisor'-namespace XML-RPC methods have been added:
    getAPIVersion (returns the XML-RPC API version, the older
    "getVersion" is now deprecated), "startProcessGroup" (starts all
    processes in a supervisor process group), "stopProcessGroup"
    (stops all processes in a supervisor process group), and
    "sendProcessStdin" (sends data to a process' stdin file
    descriptor).

  - 'supervisor'-namespace XML-RPC methods which previously accepted
    ony a process name as "name" (startProcess, stopProcess,
    getProcessInfo, readProcessLog, tailProcessLog, and
    clearProcessLog) now accept a "name" which may contain both the
    process name and the process group name in the form
    'groupname:procname'.  For backwards compatibility purposes,
    "simple" names will also be accepted but will be expanded
    internally (e.g. if "foo" is sent as a name, it will be expanded
    to "foo:foo", representing the foo process within the foo process
    group).

  - 2.X versions of supervisorctl will work against supervisor 3.0
    servers in a degraded fashion, but 3.X versions of supervisorctl
    will not work at all against supervisor 2.X servers.

  Known issues:

    - supervisorctl and the web interface do not yet allow you to stop
      / start / restart a process group as a unit.

    - supervisorctl and the web interface do not allow you to tail or
      otherwise examine stderr log files of processes.

    - buffered event notifications may be lost at supervisor shutdown
      or restart time.

  Acknowledgements:

    Maintainable Software (http://www.maintainable.com) contracted
    Agendless Consulting to add the event notification features and
    extensible XML-RPC namespaces feature to supervisor.

2.2b1 (2007-03-31)

  - Individual program configuration sections can now specify an
    environment.

  - Added a 'version' command to supervisorctl.  This returns the
    version of the supervisor2 package which the remote supervisord
    process is using.

2.1 (2007-03-17)

  - When supervisord was invoked more than once, and its configuration
    was set up to use a UNIX domain socket as the HTTP server, the
    socket file would be erased in error.  The symptom of this was
    that a subsequent invocation of supervisorctl could not find the
    socket file, so the process could not be controlled (it and all of
    its subprocesses would need to be killed by hand).

  - Close subprocess file descriptors properly when a subprocess exits
    or otherwise dies.  This should result in fewer "too many open
    files to spawn foo" messages when supervisor is left up for long
    periods of time.

  - When a process was not killable with a "normal" signal at shutdown
    time, too many "INFO: waiting for x to die" messages would be sent
    to the log until we ended up killing the process with a SIGKILL.
    Now a maximum of one every three seconds is sent up until SIGKILL
    time.  Thanks to Ian Bicking.

  - Add an assertion: we never want to try to marshal None to XML-RPC
    callers.  Issue 223 in the collector from vgatto indicates that
    somehow a supervisor XML-RPC method is returning None (which
    should never happen), but I cannot identify how.  Maybe the
    assertion will give us more clues if it happens again.

  - Supervisor would crash when run under Python 2.5 because the
    xmlrpclib.Transport class in Python 2.5 changed in a
    backward-incompatible way.  Thanks to Eric Westra for the bug
    report and a fix.

  - Tests now pass under Python 2.5.

  - Better supervisorctl reporting on stop requests that have a FAILED
    status.

  - Removed duplicated code (readLog/readMainLog), thanks to Mike
    Naberezny.

  - Added tailProcessLog command to the XML-RPC API.  It provides a
    more efficient way to tail logs than readProcessLog().  Use
    readProcessLog() to read chunks and tailProcessLog() to tail.
    (thanks to Mike Naberezny).

2.1b1 (2006-08-30)

  - "supervisord -h" and "supervisorctl -h" did not work (traceback
    instead of showing help view (thanks to Damjan from Macedonia for
    the bug report).

  - Processes which started successfully after failing to start
    initially are no longer reported in BACKOFF state once they are
    started successfully (thanks to Damjan from Macdonia for the bug
    report).

  - Add new 'maintail' command to supervisorctl shell, which allows
    you to tail the 'main' supervisor log.  This uses a new
    readMainLog xmlrpc API.

  - Various process-state-transition related changes, all internal.
    README.txt updated with new state transition map.

  - startProcess and startAllProcesses xmlrpc APIs changed: instead of
    accepting a timeout integer, these accept a wait boolean (timeout
    is implied by process' "startsecs" configuration).  If wait is
    False, do not wait for startsecs.

  Known issues:

    Code does not match state transition map.  Processes which are
    configured as autorestarting which start "successfully" but
    subsequently die after 'startsecs' go through the transitions
    RUNNING -> BACKOFF -> STARTING instead of the correct transitions
    RUNNING -> EXITED -> STARTING.  This has no real negative effect,
    but should be fixed for correctness.

2.0 (2006-08-30)

  - pidfile written in daemon mode had incorrect pid.

  - supervisorctl: tail (non -f) did not pass through proper error
    messages when supplied by the server.

  - Log signal name used to kill processes at debug level.

  - supervisorctl "tail -f" didn't work with supervisorctl sections
    configured with an absolute unix:// URL

  - New "environment" config file option allows you to add environment
    variable values to supervisord environment from config file.

2.0b1 (2006-07-12)

  - fundamental rewrite based on 1.0.6, use distutils (only) for
    installation, use ConfigParser rather than ZConfig, use HTTP for
    wire protocol, web interface, less lies in supervisorctl.
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.