Currently only zc.recipe.egg:custom supports setting environment
variables, and zc.recipe.egg:develop does not.

My motivation for allowing setting environment in :develop is
wendelin.core

    https://lab.nexedi.cn/nexedi/slapos/blob/b5faab3b/component/wendelin.core/buildout.cfg

There we have [wendelin.core] part which installs released egg from
pypi, and [wendelin.core-dev] part which installs wendelin.core from
its latest git version via zc.recipe.egg:develop .

The problem is, wendelin.core for setup.py to work, needs git available,
and with slapos we usually don't have git available on base system, so
we build it by our own and do something like

    [wendelin.core-dev]
    recipe = zc.recipe.egg:develop
    environment = wendelin.core-dev-env

    [wendelin.core-dev-env]
    # wendelin.core-dev needs git to build
    PATH = ${git:location}/bin:%(PATH)s

and the problem is environment does not currently work for
zc.recipe.egg:develop, and thus git is not found -> build fails.

~~~~

In order to support environment in :develop, we just move environment
setting/restoring bits from Custom to Base, and provide Base.install() which
uses this bits. Custom & Develop .install() becomes ._install() which gets
hooked into Base.install() .

I've tested the patch only manually, because currently automated tests are
broken in a lot of places for slapos.buildout and zc.recipe.egg .

/cc @kazuhiko, @Tyagov

- Support on the fly patches in zc.recipe.egg by ``EGGNAME-patches``,
  ``EGGNAME-patch-options``, ``EGGNAME-patch-binary`` (or
  ``patch-binary``) and ``EGGNAME-patch-revision`` options.
- Support on the fly patches in zc.recipe.egg:custom by ``patches``,
  ``patch-options``, ``patch-binary`` and ``patch-revision`` options.
  (options ``EGGNAME-*`` are also supported as well).

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Handle systems with pkg_resources but without setuptools (I am looking at you Ubuntu.. grrr). Fixes LP#410528

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move the new bootstrap aside to let virtualenv users that have packages linked to bootstrap in trunk stay happy.

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merge lp:~gary/zc.buildout/python-support (also available as svn+ssh://svn.zope.org/repos/main/zc.buildout/branches/gary-launchpad).  This adds support for system Pythons, as well as other changes, such as improved Distribute support and some cleanups.

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Warning when a script name passed in 'scripts' argument of easy_install.scripts
is not defined in an entry point.

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both from command line and from config files.

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and avoid spurious test failures.


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fail. The change had to do with the way setuptools was installed.
This seems to explain the changed test output, which is incidental to
what's tested. This test *was* only run for Python 2.5.

I've changed the test to run whenever Python 2.4 isn't used and
updated the test to reflect the new output.


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svn+ssh://svn.zope.org/repos/main/zc.buildout/branches/gary-1

Lots of good cleanup changes, including making windows tests a bit
more robust.


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adjusted testselectingpython.py the same way as easyinstall.txt earlier: there's no call to _get_dist() for setuptools anymore as we already have it


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