tests/test-bundle2-remote-changegroup.t

wireproto: compress data from a generator

Currently, the "getbundle" wire protocol command obtains a generator of
data, converts it to a util.chunkbuffer, then converts it back to a
generator via the protocol's groupchunks() implementation. For the SSH
protocol, groupchunks() simply reads 4kb chunks then write()s the
data to a file descriptor. For the HTTP protocol, groupchunks() reads
32kb chunks, feeds those into a zlib compressor, emits compressed data
as it is available, and that is sent to the WSGI layer, where it is
likely turned into HTTP chunked transfer chunks as is or further
buffered and turned into a larger chunk.

For both the SSH and HTTP protocols, there is inefficiency from using
util.chunkbuffer.

For SSH, emitting consistent 4kb chunks sounds nice. However, the file
descriptor it is writing to is almost certainly buffered. That means
that a Python .write() probably doesn't translate into exactly what is
written to the I/O layer.

For HTTP, we're going through an intermediate layer to zlib compress
data. So all util.chunkbuffer is doing is ensuring that the chunks we
feed into the zlib compressor are of uniform size. This means more CPU
time in Python buffering and emitting chunks in util.chunkbuffer but
fewer function calls to zlib.

This patch introduces and implements a new wire protocol abstract
method: compresschunks(). It is like groupchunks() except it operates
on a generator instead of something with a .read(). The SSH
implementation simply proxies chunks. The HTTP implementation uses
zlib compression.

To avoid duplicate code, the HTTP groupchunks() has been reimplemented
in terms of compresschunks().

To prove this all works, the "getbundle" wire protocol command has been
switched to compresschunks(). This removes the util.chunkbuffer from
that command. Now, data essentially streams straight from the
changegroup emitter to the wire, possibly through a zlib compressor.
Generators all the way, baby.

There were slim to no performance changes on the server as measured
with the mozilla-central repository. This is likely because CPU
time is dominated by reading revlogs, producing the changegroup, and
zlib compressing the output stream. Still, this brings us a little
closer to our ideal of using generators everywhere.

#require killdaemons

Create an extension to test bundle2 remote-changegroup parts

  $ cat > bundle2.py << EOF
  > """A small extension to test bundle2 remote-changegroup parts.
  > 
  > Current bundle2 implementation doesn't provide a way to generate those
  > parts, so they must be created by extensions.
  > """
  > from mercurial import bundle2, changegroup, discovery, exchange, util
  > 
  > def _getbundlechangegrouppart(bundler, repo, source, bundlecaps=None,
  >                               b2caps=None, heads=None, common=None,
  >                               **kwargs):
  >     """this function replaces the changegroup part handler for getbundle.
  >     It allows to create a set of arbitrary parts containing changegroups
  >     and remote-changegroups, as described in a bundle2maker file in the
  >     repository .hg/ directory.
  > 
  >     Each line of that bundle2maker file contain a description of the
  >     part to add:
  >       - changegroup common_revset heads_revset
  >           Creates a changegroup part based, using common_revset and
  >           heads_revset for outgoing
  >       - remote-changegroup url file
  >           Creates a remote-changegroup part for a bundle at the given
  >           url. Size and digest, as required by the client, are computed
  >           from the given file.
  >       - raw-remote-changegroup <python expression>
  >           Creates a remote-changegroup part with the data given in the
  >           python expression as parameters. The python expression is
  >           evaluated with eval, and is expected to be a dict.
  >     """
  >     def newpart(name, data=''):
  >         """wrapper around bundler.newpart adding an extra part making the
  >         client output information about each processed part"""
  >         bundler.newpart('output', data=name)
  >         part = bundler.newpart(name, data=data)
  >         return part
  > 
  >     for line in open(repo.join('bundle2maker'), 'r'):
  >         line = line.strip()
  >         try:
  >             verb, args = line.split(None, 1)
  >         except ValueError:
  >             verb, args = line, ''
  >         if verb == 'remote-changegroup':
  >            url, file = args.split()
  >            bundledata = open(file, 'rb').read()
  >            digest = util.digester.preferred(b2caps['digests'])
  >            d = util.digester([digest], bundledata)
  >            part = newpart('remote-changegroup')
  >            part.addparam('url', url)
  >            part.addparam('size', str(len(bundledata)))
  >            part.addparam('digests', digest)
  >            part.addparam('digest:%s' % digest, d[digest])
  >         elif verb == 'raw-remote-changegroup':
  >            part = newpart('remote-changegroup')
  >            for k, v in eval(args).items():
  >                part.addparam(k, str(v))
  >         elif verb == 'changegroup':
  >             _common, heads = args.split()
  >             common.extend(repo.lookup(r) for r in repo.revs(_common))
  >             heads = [repo.lookup(r) for r in repo.revs(heads)]
  >             outgoing = discovery.outgoing(repo, common, heads)
  >             cg = changegroup.getchangegroup(repo, 'changegroup', outgoing)
  >             newpart('changegroup', cg.getchunks())
  >         else:
  >             raise Exception('unknown verb')
  > 
  > exchange.getbundle2partsmapping['changegroup'] = _getbundlechangegrouppart
  > EOF

Start a simple HTTP server to serve bundles

  $ python "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
  $ cat dumb.pid >> $DAEMON_PIDS

  $ cat >> $HGRCPATH << EOF
  > [ui]
  > ssh=python "$TESTDIR/dummyssh"
  > logtemplate={rev}:{node|short} {phase} {author} {bookmarks} {desc|firstline}
  > EOF

  $ hg init repo

  $ hg -R repo unbundle $TESTDIR/bundles/rebase.hg
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg -R repo log -G
  o  7:02de42196ebe draft Nicolas Dumazet <[e-mail]>  H
  |
  | o  6:eea13746799a draft Nicolas Dumazet <[e-mail]>  G
  |/|
  o |  5:24b6387c8c8c draft Nicolas Dumazet <[e-mail]>  F
  | |
  | o  4:9520eea781bc draft Nicolas Dumazet <[e-mail]>  E
  |/
  | o  3:32af7686d403 draft Nicolas Dumazet <[e-mail]>  D
  | |
  | o  2:5fddd98957c8 draft Nicolas Dumazet <[e-mail]>  C
  | |
  | o  1:42ccdea3bb16 draft Nicolas Dumazet <[e-mail]>  B
  |/
  o  0:cd010b8cd998 draft Nicolas Dumazet <[e-mail]>  A
  
  $ hg clone repo orig
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat > repo/.hg/hgrc << EOF
  > [extensions]
  > bundle2=$TESTTMP/bundle2.py
  > EOF

Test a pull with an remote-changegroup

  $ hg bundle -R repo --type v1 --base '0:4' -r '5:7' bundle.hg
  3 changesets found
  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/bundle.hg bundle.hg
  > EOF
  $ hg clone orig clone -r 3 -r 4
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 5 changes to 5 files (+1 heads)
  updating to branch default
  4 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 2 files (+1 heads)
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R clone log -G
  o  7:02de42196ebe public Nicolas Dumazet <[e-mail]>  H
  |
  | o  6:eea13746799a public Nicolas Dumazet <[e-mail]>  G
  |/|
  o |  5:24b6387c8c8c public Nicolas Dumazet <[e-mail]>  F
  | |
  | o  4:9520eea781bc public Nicolas Dumazet <[e-mail]>  E
  |/
  | @  3:32af7686d403 public Nicolas Dumazet <[e-mail]>  D
  | |
  | o  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  | |
  | o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |/
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  
  $ rm -rf clone

Test a pull with an remote-changegroup and a following changegroup

  $ hg bundle -R repo --type v1 --base 2 -r '3:4' bundle2.hg
  2 changesets found
  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/bundle2.hg bundle2.hg
  > changegroup 0:4 5:7
  > EOF
  $ hg clone orig clone -r 2
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  remote: changegroup
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 2 files (+1 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R clone log -G
  o  7:02de42196ebe public Nicolas Dumazet <[e-mail]>  H
  |
  | o  6:eea13746799a public Nicolas Dumazet <[e-mail]>  G
  |/|
  o |  5:24b6387c8c8c public Nicolas Dumazet <[e-mail]>  F
  | |
  | o  4:9520eea781bc public Nicolas Dumazet <[e-mail]>  E
  |/
  | o  3:32af7686d403 public Nicolas Dumazet <[e-mail]>  D
  | |
  | @  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  | |
  | o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |/
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  
  $ rm -rf clone

Test a pull with a changegroup followed by an remote-changegroup

  $ hg bundle -R repo --type v1 --base '0:4' -r '5:7' bundle3.hg
  3 changesets found
  $ cat > repo/.hg/bundle2maker << EOF
  > changegroup 000000000000 :4
  > remote-changegroup http://localhost:$HGPORT/bundle3.hg bundle3.hg
  > EOF
  $ hg clone orig clone -r 2
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 2 files (+1 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R clone log -G
  o  7:02de42196ebe public Nicolas Dumazet <[e-mail]>  H
  |
  | o  6:eea13746799a public Nicolas Dumazet <[e-mail]>  G
  |/|
  o |  5:24b6387c8c8c public Nicolas Dumazet <[e-mail]>  F
  | |
  | o  4:9520eea781bc public Nicolas Dumazet <[e-mail]>  E
  |/
  | o  3:32af7686d403 public Nicolas Dumazet <[e-mail]>  D
  | |
  | @  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  | |
  | o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |/
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  
  $ rm -rf clone

Test a pull with two remote-changegroups and a changegroup

  $ hg bundle -R repo --type v1 --base 2 -r '3:4' bundle4.hg
  2 changesets found
  $ hg bundle -R repo --type v1 --base '3:4' -r '5:6' bundle5.hg
  2 changesets found
  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/bundle4.hg bundle4.hg
  > remote-changegroup http://localhost:$HGPORT/bundle5.hg bundle5.hg
  > changegroup 0:6 7
  > EOF
  $ hg clone orig clone -r 2
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 1 changes to 1 files
  remote: changegroup
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R clone log -G
  o  7:02de42196ebe public Nicolas Dumazet <[e-mail]>  H
  |
  | o  6:eea13746799a public Nicolas Dumazet <[e-mail]>  G
  |/|
  o |  5:24b6387c8c8c public Nicolas Dumazet <[e-mail]>  F
  | |
  | o  4:9520eea781bc public Nicolas Dumazet <[e-mail]>  E
  |/
  | o  3:32af7686d403 public Nicolas Dumazet <[e-mail]>  D
  | |
  | @  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  | |
  | o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |/
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  
  $ rm -rf clone

Hash digest tests

  $ hg bundle -R repo --type v1 -a bundle6.hg
  8 changesets found

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'sha1', 'digest:sha1': '2c880cfec23cff7d8f80c2f12958d1563cbdaba6'}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ rm -rf clone

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'md5', 'digest:md5': 'e22172c2907ef88794b7bea6642c2394'}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ rm -rf clone

Hash digest mismatch throws an error

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'sha1', 'digest:sha1': '0' * 40}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  transaction abort!
  rollback completed
  abort: bundle at http://localhost:$HGPORT/bundle6.hg is corrupted:
  sha1 mismatch: expected 0000000000000000000000000000000000000000, got 2c880cfec23cff7d8f80c2f12958d1563cbdaba6
  [255]

Multiple hash digests can be given

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'md5 sha1', 'digest:md5': 'e22172c2907ef88794b7bea6642c2394', 'digest:sha1': '2c880cfec23cff7d8f80c2f12958d1563cbdaba6'}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ rm -rf clone

If either of the multiple hash digests mismatches, an error is thrown

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'md5 sha1', 'digest:md5': '0' * 32, 'digest:sha1': '2c880cfec23cff7d8f80c2f12958d1563cbdaba6'}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  transaction abort!
  rollback completed
  abort: bundle at http://localhost:$HGPORT/bundle6.hg is corrupted:
  md5 mismatch: expected 00000000000000000000000000000000, got e22172c2907ef88794b7bea6642c2394
  [255]

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle6.hg', 'size': 1663, 'digests': 'md5 sha1', 'digest:md5': 'e22172c2907ef88794b7bea6642c2394', 'digest:sha1': '0' * 40}
  > EOF
  $ hg clone ssh://user@dummy/repo clone
  requesting all changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  transaction abort!
  rollback completed
  abort: bundle at http://localhost:$HGPORT/bundle6.hg is corrupted:
  sha1 mismatch: expected 0000000000000000000000000000000000000000, got 2c880cfec23cff7d8f80c2f12958d1563cbdaba6
  [255]

Corruption tests

  $ hg clone orig clone -r 2
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files
  updating to branch default
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/bundle4.hg bundle4.hg
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle5.hg', 'size': 578, 'digests': 'sha1', 'digest:sha1': '0' * 40}
  > changegroup 0:6 7
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 1 changes to 1 files
  transaction abort!
  rollback completed
  abort: bundle at http://localhost:$HGPORT/bundle5.hg is corrupted:
  sha1 mismatch: expected 0000000000000000000000000000000000000000, got f29485d6bfd37db99983cfc95ecb52f8ca396106
  [255]

The entire transaction has been rolled back in the pull above

  $ hg -R clone log -G
  @  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  |
  o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  

No params

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: remote-changegroup: missing "url" param
  [255]

Missing size

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle4.hg'}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: remote-changegroup: missing "size" param
  [255]

Invalid size

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle4.hg', 'size': 'foo'}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: remote-changegroup: invalid value for param "size"
  [255]

Size mismatch

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle4.hg', 'size': 42}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files (+1 heads)
  transaction abort!
  rollback completed
  abort: bundle at http://localhost:$HGPORT/bundle4.hg is corrupted:
  size mismatch: expected 42, got 581
  [255]

Unknown digest

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle4.hg', 'size': 581, 'digests': 'foo', 'digest:foo': 'bar'}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: missing support for remote-changegroup - digest:foo
  [255]

Missing digest

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'http://localhost:$HGPORT/bundle4.hg', 'size': 581, 'digests': 'sha1'}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: remote-changegroup: missing "digest:sha1" param
  [255]

Not an HTTP url

  $ cat > repo/.hg/bundle2maker << EOF
  > raw-remote-changegroup {'url': 'ssh://localhost:$HGPORT/bundle4.hg', 'size': 581}
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: remote-changegroup does not support ssh urls
  [255]

Not a bundle

  $ cat > notbundle.hg << EOF
  > foo
  > EOF
  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/notbundle.hg notbundle.hg
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: http://localhost:$HGPORT/notbundle.hg: not a Mercurial bundle
  [255]

Not a bundle 1.0

  $ cat > notbundle10.hg << EOF
  > HG20
  > EOF
  $ cat > repo/.hg/bundle2maker << EOF
  > remote-changegroup http://localhost:$HGPORT/notbundle10.hg notbundle10.hg
  > EOF
  $ hg pull -R clone ssh://user@dummy/repo
  pulling from ssh://user@dummy/repo
  searching for changes
  remote: remote-changegroup
  abort: http://localhost:$HGPORT/notbundle10.hg: not a bundle version 1.0
  [255]

  $ hg -R clone log -G
  @  2:5fddd98957c8 public Nicolas Dumazet <[e-mail]>  C
  |
  o  1:42ccdea3bb16 public Nicolas Dumazet <[e-mail]>  B
  |
  o  0:cd010b8cd998 public Nicolas Dumazet <[e-mail]>  A
  
  $ rm -rf clone

  $ killdaemons.py