tests/test-debugextensions.t

changegroup: cg3 has two empty groups *after* manifests

changegroup.getchunks() determines the end of the stream by looking
for an empty chunk group (two consecutive empty chunks). It ignores
empty groups in the first two groups. Changegroup 3 introduced an
empty chunk between the manifests and the files, which confuses
getchunks(). Since it comes after the first two, getchunks() will stop
there.

Fix by rewriting getchunks so it first counts two groups (empty or
not) and then keeps antostarts counting empty groups. With this counting,
changegroup 1 and 2 have exactly one empty group after the first two
groups, while changegroup 3 has two (one for directories and one for
files).

It's a little hard to test this at this point, but I have verified
that this patch fixes narrowhg (which was broken before this
patch). Also, future patches will fix "hg strip" with treemanifests,
and once that's done, getchunks() will be tested through tests of "hg
strip".

  $ hg debugextensions

  $ debugpath=`pwd`/extwithoutinfos.py

  $ cat > extwithoutinfos.py <<EOF
  > EOF

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > color=
  > histedit=
  > patchbomb=
  > rebase=
  > mq=
  > ext1 = $debugpath
  > EOF

  $ hg debugextensions
  color
  ext1 (untested!)
  histedit
  mq
  patchbomb
  rebase

  $ hg debugextensions -v
  color
    location: */hgext/color.pyc (glob)
    tested with: internal
  ext1
    location: */extwithoutinfos.pyc (glob)
  histedit
    location: */hgext/histedit.pyc (glob)
    tested with: internal
  mq
    location: */hgext/mq.pyc (glob)
    tested with: internal
  patchbomb
    location: */hgext/patchbomb.pyc (glob)
    tested with: internal
  rebase
    location: */hgext/rebase.pyc (glob)
    tested with: internal

  $ hg debugextensions -Tjson | sed 's|\\\\|/|g'
  [
   {
    "buglink": "",
    "name": "color",
    "source": "*/hgext/color.pyc", (glob)
    "testedwith": "internal"
   },
   {
    "buglink": "",
    "name": "ext1",
    "source": "*/extwithoutinfos.pyc", (glob)
    "testedwith": ""
   },
   {
    "buglink": "",
    "name": "histedit",
    "source": "*/hgext/histedit.pyc", (glob)
    "testedwith": "internal"
   },
   {
    "buglink": "",
    "name": "mq",
    "source": "*/hgext/mq.pyc", (glob)
    "testedwith": "internal"
   },
   {
    "buglink": "",
    "name": "patchbomb",
    "source": "*/hgext/patchbomb.pyc", (glob)
    "testedwith": "internal"
   },
   {
    "buglink": "",
    "name": "rebase",
    "source": "*/hgext/rebase.pyc", (glob)
    "testedwith": "internal"
   }
  ]