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sparse: vendor Facebook-developed extension Facebook has developed an extension to enable "sparse" checkouts - a working directory with a subset of files. This feature is a critical component in enabling repositories to scale to infinite number of files while retaining reasonable performance. It's worth noting that sparse checkout is only one possible solution to this problem: another is virtual filesystems that realize files on first access. But given that virtual filesystems may not be accessible to all users, sparse checkout is necessary as a fallback. Per mailing list discussion at https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/095868.html we want to add sparse checkout to the Mercurial distribution via roughly the following mechanism: 1. Vendor extension as-is with minimal modifications (this patch) 2. Refactor extension so it is more clearly experimental and inline with Mercurial practices 3. Move code from extension into core where possible 4. Drop experimental labeling and/or move feature into core after sign-off from narrow clone feature owners This commit essentially copies the sparse extension and tests from revision 71e0a2aeca92a4078fe1b8c76e32c88ff1929737 of the https://bitbucket.org/facebook/hg-experimental repository. A list of modifications made as part of vendoring is as follows: * "EXPERIMENTAL" added to module docstring * Imports were changed to match Mercurial style conventions * "testedwith" value was updated to core Mercurial special value and comment boilerplate was inserted * A "clone_sparse" function was renamed to "clonesparse" to appease the style checker * Paths to the sparse extension in tests reflect built-in location * test-sparse-extensions.t was renamed to test-sparse-fsmonitor.t and references to "simplecache" were removed. The test always skips because it isn't trivial to run it given the way we currently run fsmonitor tests * A double empty line was removed from test-sparse-profiles.t There are aspects of the added code that are obviously not ideal. The goal is to make a minimal number of modifications as part of the vendoring to make it easier to track changes from the original implementation. Refactoring will occur in subsequent patches.
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 01 Jul 2017 10:43:29 -0700
parents d3177aecac01
children 9bd003052d55
line wrap: on
line source

#require killdaemons serve zstd

Client version is embedded in HTTP request and is effectively dynamic. Pin the
version so behavior is deterministic.

  $ cat > fakeversion.py << EOF
  > from mercurial import util
  > util.version = lambda: '4.2'
  > EOF

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > fakeversion = `pwd`/fakeversion.py
  > EOF

  $ hg init server0
  $ cd server0
  $ touch foo
  $ hg -q commit -A -m initial

Also disable compression because zstd is optional and causes output to vary
and because debugging partial responses is hard when compression is involved

  $ cat > .hg/hgrc << EOF
  > [extensions]
  > badserver = $TESTDIR/badserverext.py
  > [server]
  > compressionengines = none
  > EOF

Failure to accept() socket should result in connection related error message

  $ hg --config badserver.closebeforeaccept=true serve -p $HGPORT -d --pid-file=hg.pid
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: Connection reset by peer (no-windows !)
  abort: error: An existing connection was forcibly closed by the remote host (windows !)
  [255]

(The server exits on its own, but there is a race between that and starting a new server.
So ensure the process is dead.)

  $ killdaemons.py $DAEMON_PIDS

Failure immediately after accept() should yield connection related error message

  $ hg --config badserver.closeafteraccept=true serve -p $HGPORT -d --pid-file=hg.pid
  $ cat hg.pid > $DAEMON_PIDS

TODO: this usually outputs good results, but sometimes emits abort:
error: '' on FreeBSD and OS X.
What we ideally want are:

abort: error: Connection reset by peer (no-windows !)
abort: error: An existing connection was forcibly closed by the remote host (windows !)

The flakiness in this output was observable easily with
--runs-per-test=20 on macOS 10.12 during the freeze for 4.2.
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: * (glob)
  [255]

  $ killdaemons.py $DAEMON_PIDS

Failure to read all bytes in initial HTTP request should yield connection related error message

  $ hg --config badserver.closeafterrecvbytes=1 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO this error message is not very good

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(1 from 65537) -> (1) G
  read limit reached; closing socket

  $ rm -f error.log

Same failure, but server reads full HTTP request line

  $ hg --config badserver.closeafterrecvbytes=40 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(40 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(7 from -1) -> (7) Accept-
  read limit reached; closing socket

  $ rm -f error.log

Failure on subsequent HTTP request on the same socket (cmd?batch)

  $ hg --config badserver.closeafterrecvbytes=210 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(210 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(177 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(150 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(115 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(9? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(4? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 405\r\n
  write(2) -> \r\n
  write(405) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(4? from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n (glob)
  readline(1? from -1) -> (1?) Accept-Encoding* (glob)
  read limit reached; closing socket
  readline(210 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(184 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(157 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(128 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(87 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(39 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(4 from -1) -> (4) host
  read limit reached; closing socket

  $ rm -f error.log

Failure to read getbundle HTTP request

  $ hg --config badserver.closeafterrecvbytes=292 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: error: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(292 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(259 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(232 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(197 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(17? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(12? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 405\r\n
  write(2) -> \r\n
  write(405) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline\(12[34] from 65537\) -> \(2[67]\) GET /\?cmd=batch HTTP/1.1\\r\\n (re)
  readline(9? from -1) -> (27) Accept-Encoding: identity\r\n (glob)
  readline(7? from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n (glob)
  readline(4? from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n (glob)
  readline(1 from -1) -> (1) x (?)
  read limit reached; closing socket
  readline(292 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(266 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(239 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(210 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(169 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(121 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(86 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(6? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(1? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(20) -> Content-Length: 42\r\n
  write(2) -> \r\n
  write(42) -> 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline\(1[23] from 65537\) -> \(1[23]\) GET /\?cmd=ge.? (re)
  read limit reached; closing socket
  readline(292 from 65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(262 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(235 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(206 from -1) -> (206) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Ali
  read limit reached; closing socket

  $ rm -f error.log

Now do a variation using POST to send arguments

  $ hg --config experimental.httppostargs=true --config badserver.closeafterrecvbytes=315 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(315 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(282 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(255 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(220 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(19? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(14? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 418\r\n
  write(2) -> \r\n
  write(418) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httppostargs httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline\(14[67] from 65537\) -> \(2[67]\) POST /\?cmd=batch HTTP/1.1\\r\\n (re)
  readline\(1(19|20) from -1\) -> \(27\) Accept-Encoding: identity\\r\\n (re)
  readline(9? from -1) -> (41) content-type: application/mercurial-0.1\r\n (glob)
  readline(5? from -1) -> (19) vary: X-HgProto-1\r\n (glob)
  readline(3? from -1) -> (19) x-hgargs-post: 28\r\n (glob)
  readline(1? from -1) -> (1?) x-hgproto-1: * (glob)
  read limit reached; closing socket
  readline(315 from 65537) -> (27) POST /?cmd=batch HTTP/1.1\r\n
  readline(288 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(261 from -1) -> (41) content-type: application/mercurial-0.1\r\n
  readline(220 from -1) -> (19) vary: X-HgProto-1\r\n
  readline(201 from -1) -> (19) x-hgargs-post: 28\r\n
  readline(182 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(134 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(99 from -1) -> (20) content-length: 28\r\n
  readline(79 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(5? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(? from -1) -> (2) \r\n (glob)
  read(? from 28) -> (?) cmds=* (glob)
  read limit reached, closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Now move on to partial server responses

Server sends a single character from the HTTP response line

  $ hg --config badserver.closeaftersendbytes=1 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: H
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(1 from 36) -> (0) H
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends an incomplete capabilities response body

  $ hg --config badserver.closeaftersendbytes=180 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: HTTP request error (incomplete response; expected 385 bytes got 20)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (144) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (121) Server: badhttpserver\r\n
  write(37 from 37) -> (84) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (43) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (22) Content-Length: 405\r\n
  write(2 from 2) -> (20) \r\n
  write(20 from 405) -> (0) lookup changegroupsu
  write limit reached; closing socket

  $ rm -f error.log

Server sends incomplete headers for batch request

  $ hg --config badserver.closeaftersendbytes=695 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO this output is horrible

  $ hg clone http://localhost:$HGPORT/ clone
  abort: 'http://localhost:$HGPORT/' does not appear to be an hg repository:
  ---%<--- (application/mercuria)
  
  ---%<---
  !
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (659) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (636) Server: badhttpserver\r\n
  write(37 from 37) -> (599) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (558) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (537) Content-Length: 405\r\n
  write(2 from 2) -> (535) \r\n
  write(405 from 405) -> (130) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (94) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (71) Server: badhttpserver\r\n
  write(37 from 37) -> (34) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(34 from 41) -> (0) Content-Type: application/mercuria
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends an incomplete HTTP response body to batch request

  $ hg --config badserver.closeaftersendbytes=760 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO client spews a stack due to uncaught ValueError in batch.results()
  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
  [1]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (724) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (701) Server: badhttpserver\r\n
  write(37 from 37) -> (664) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (623) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (602) Content-Length: 405\r\n
  write(2 from 2) -> (600) \r\n
  write(405 from 405) -> (195) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (159) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (136) Server: badhttpserver\r\n
  write(37 from 37) -> (99) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (58) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (38) Content-Length: 42\r\n
  write(2 from 2) -> (36) \r\n
  write(36 from 42) -> (0) 96ee1d7354c4ad7372047672c36a1f561e3a
  write limit reached; closing socket

  $ rm -f error.log

Server sends incomplete headers for getbundle response

  $ hg --config badserver.closeaftersendbytes=895 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO this output is terrible

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: 'http://localhost:$HGPORT/' does not appear to be an hg repository:
  ---%<--- (application/mercuri)
  
  ---%<---
  !
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (859) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (836) Server: badhttpserver\r\n
  write(37 from 37) -> (799) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (758) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (737) Content-Length: 405\r\n
  write(2 from 2) -> (735) \r\n
  write(405 from 405) -> (330) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (294) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (271) Server: badhttpserver\r\n
  write(37 from 37) -> (234) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (193) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (173) Content-Length: 42\r\n
  write(2 from 2) -> (171) \r\n
  write(42 from 42) -> (129) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (93) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (70) Server: badhttpserver\r\n
  write(37 from 37) -> (33) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(33 from 41) -> (0) Content-Type: application/mercuri
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends empty HTTP body for getbundle

  $ hg --config badserver.closeaftersendbytes=933 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (897) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (874) Server: badhttpserver\r\n
  write(37 from 37) -> (837) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (796) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (775) Content-Length: 405\r\n
  write(2 from 2) -> (773) \r\n
  write(405 from 405) -> (368) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (332) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (309) Server: badhttpserver\r\n
  write(37 from 37) -> (272) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (231) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (211) Content-Length: 42\r\n
  write(2 from 2) -> (209) \r\n
  write(42 from 42) -> (167) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (131) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (108) Server: badhttpserver\r\n
  write(37 from 37) -> (71) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (30) Content-Type: application/mercurial-0.2\r\n
  write(28 from 28) -> (2) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (0) \r\n
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends partial compression string

  $ hg --config badserver.closeaftersendbytes=945 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response; expected 1 bytes got 3)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (909) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (886) Server: badhttpserver\r\n
  write(37 from 37) -> (849) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (808) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (787) Content-Length: 405\r\n
  write(2 from 2) -> (785) \r\n
  write(405 from 405) -> (380) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (344) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (321) Server: badhttpserver\r\n
  write(37 from 37) -> (284) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (243) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (223) Content-Length: 42\r\n
  write(2 from 2) -> (221) \r\n
  write(42 from 42) -> (179) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (143) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (120) Server: badhttpserver\r\n
  write(37 from 37) -> (83) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
  write(41 from 41) -> (42) Content-Type: application/mercurial-0.2\r\n
  write(28 from 28) -> (14) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (12) \r\n
  write(6 from 6) -> (6) 1\\r\\n\x04\\r\\n (esc)
  write(6 from 9) -> (0) 4\r\nnon
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server sends partial bundle2 header magic

  $ hg --config badserver.closeaftersendbytes=954 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response; expected 1 bytes got 3)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -7 error.log
  write(28 from 28) -> (23) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (21) \r\n
  write(6 from 6) -> (15) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (6) 4\r\nnone\r\n
  write(6 from 9) -> (0) 4\r\nHG2
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server sends incomplete bundle2 stream params length

  $ hg --config badserver.closeaftersendbytes=963 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response; expected 1 bytes got 3)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -8 error.log
  write(28 from 28) -> (32) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (30) \r\n
  write(6 from 6) -> (24) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (15) 4\r\nnone\r\n
  write(9 from 9) -> (6) 4\r\nHG20\r\n
  write(6 from 9) -> (0) 4\\r\\n\x00\x00\x00 (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Servers stops after bundle2 stream params header

  $ hg --config badserver.closeaftersendbytes=966 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -8 error.log
  write(28 from 28) -> (35) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (33) \r\n
  write(6 from 6) -> (27) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (18) 4\r\nnone\r\n
  write(9 from 9) -> (9) 4\r\nHG20\r\n
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after bundle2 part header length

  $ hg --config badserver.closeaftersendbytes=975 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -9 error.log
  write(28 from 28) -> (44) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (42) \r\n
  write(6 from 6) -> (36) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (27) 4\r\nnone\r\n
  write(9 from 9) -> (18) 4\r\nHG20\r\n
  write(9 from 9) -> (9) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after bundle2 part header

  $ hg --config badserver.closeaftersendbytes=1022 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -10 error.log
  write(28 from 28) -> (91) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (89) \r\n
  write(6 from 6) -> (83) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (74) 4\r\nnone\r\n
  write(9 from 9) -> (65) 4\r\nHG20\r\n
  write(9 from 9) -> (56) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (47) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (0) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops after bundle2 part payload chunk size

  $ hg --config badserver.closeaftersendbytes=1031 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -11 error.log
  write(28 from 28) -> (100) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (98) \r\n
  write(6 from 6) -> (92) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (83) 4\r\nnone\r\n
  write(9 from 9) -> (74) 4\r\nHG20\r\n
  write(9 from 9) -> (65) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (56) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (9) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending in middle of bundle2 payload chunk

  $ hg --config badserver.closeaftersendbytes=1504 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -12 error.log
  write(28 from 28) -> (573) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (571) \r\n
  write(6 from 6) -> (565) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (556) 4\r\nnone\r\n
  write(9 from 9) -> (547) 4\r\nHG20\r\n
  write(9 from 9) -> (538) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (529) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (482) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (473) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (0) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after 0 length payload chunk size

  $ hg --config badserver.closeaftersendbytes=1513 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -13 error.log
  write(28 from 28) -> (582) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (580) \r\n
  write(6 from 6) -> (574) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (565) 4\r\nnone\r\n
  write(9 from 9) -> (556) 4\r\nHG20\r\n
  write(9 from 9) -> (547) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (538) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (491) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (482) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (9) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after 0 part bundle part header (indicating end of bundle2 payload)
This is before the 0 size chunked transfer part that signals end of HTTP response.

  $ hg --config badserver.closeaftersendbytes=1710 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ killdaemons.py $DAEMON_PIDS

  $ tail -22 error.log
  write(28 from 28) -> (779) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (777) \r\n
  write(6 from 6) -> (771) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (762) 4\r\nnone\r\n
  write(9 from 9) -> (753) 4\r\nHG20\r\n
  write(9 from 9) -> (744) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (735) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (688) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (679) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (206) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (197) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (188) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
  write(38 from 38) -> (150) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
  write(9 from 9) -> (141) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
  write(64 from 64) -> (77) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
  write(9 from 9) -> (68) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (59) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
  write(41 from 41) -> (18) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
  write(9 from 9) -> (9) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log
  $ rm -rf clone

Server sends a size 0 chunked-transfer size without terminating \r\n

  $ hg --config badserver.closeaftersendbytes=1713 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ killdaemons.py $DAEMON_PIDS

  $ tail -23 error.log
  write(28 from 28) -> (782) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (780) \r\n
  write(6 from 6) -> (774) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (765) 4\r\nnone\r\n
  write(9 from 9) -> (756) 4\r\nHG20\r\n
  write(9 from 9) -> (747) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (738) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (691) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (682) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (209) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (200) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (191) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
  write(38 from 38) -> (153) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
  write(9 from 9) -> (144) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
  write(64 from 64) -> (80) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
  write(9 from 9) -> (71) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (62) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
  write(41 from 41) -> (21) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
  write(9 from 9) -> (12) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (3) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(3 from 5) -> (0) 0\r\n
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log
  $ rm -rf clone