tests/test-generaldelta.t

bookmarks: allow pushkey if new equals current

Previously a bookmark pushkey would be rejected if the specified 'old' value
didn't match the servers 'current' value. This change allows this situation, as
long as the 'current' server value equals the 'new' pushkey value already.

We are trying to write a hook that forces a server bookmark to move forward,
using a changegroup hook. If the user also pushed the bookmark, they would get
an error, since they computed their pushkey (old,new) pair before the server
moved the bookmark. Long term, bundle2 will let us do this more smartly, but
this change seems reasonable for now.

Check whether size of generaldelta revlog is not bigger than its
regular equivalent. Test would fail if generaldelta was naive
implementation of parentdelta: third manifest revision would be fully
inserted due to big distance from its paren revision (zero).

  $ hg init repo
  $ cd repo
  $ echo foo > foo
  $ echo bar > bar
  $ hg commit -q -Am boo
  $ hg clone --pull . ../gdrepo -q --config format.generaldelta=yes
  $ for r in 1 2 3; do
  >   echo $r > foo
  >   hg commit -q -m $r
  >   hg up -q -r 0
  >   hg pull . -q -r $r -R ../gdrepo
  > done

  $ cd ..
  >>> import os
  >>> regsize = os.stat("repo/.hg/store/00manifest.i").st_size
  >>> gdsize = os.stat("gdrepo/.hg/store/00manifest.i").st_size
  >>> if regsize < gdsize:
  ...     print 'generaldata increased size of manifest'