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Implements blueprint cfg-filter-view
At the moment, if a module requires a configuration option from another
module, we do:
CONF.import_opt('source.module', 'option_name')
but, in fact, all options from the imported module are available for
use.
The new ConfigFilter class makes it possible to enforce which options
are available within a module e.g. with
CONF = cfgfilter.ConfigFilter(cfg.CONF)
CONF.import_opt('foo', 'source.module')
CONF.register_opt(StrOpt('bar'))
then the foo and bar options would be the only options available via
this CONF object while still being available via the global cfg.CONF
object.
Change-Id: Ie3aa2cd090a626da8afd27ecb78853cbf279bc8b
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The cfg API is now available via the oslo-config library, so switch to
it and remove the copied-and-pasted version.
Add the 2013.1b3 tarball to tools/pip-requires - this will be changed
to 'oslo-config>=2013.1' when oslo-config is published to pypi. This
will happen in time for grizzly final.
Remove the 'deps = pep8==1.3.3' and 'deps = pyflakes' from tox.ini as
it means all the other deps get installed with easy_install which can't
install oslo-config from the URL.
Change-Id: I4815aeb8a9341a31a250e920157f15ee15cfc5bc
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Created import_group method in cfg.py
Added testcases
Fixes bug #1107843
Change-Id: I427d4069dacbb6e586687370adbb08b5d50f7b63
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Related to blueprint cfg-global-object
When using the global config object pattern, you often have modules
which define options that are referenced in other options.
So, for example if module A defined option 'foo' and module be needed
to reference that option, you might do:
import A
print CONF.foo
However, this makes it entirely unclear to the casual reader why
module A was imported.
Nova has a flags.DECLARE() function that helps with this problem
by allowing you to do:
flags.DECLARE('foo', 'A')
The function simply imports module A and checks that the 'foo'
option is now defined in the global config object.
This is fine, but it is also implicit that this function applies
to the global config object. Instead, let's do the following:
CONF.import_opt('foo', 'A')
Change-Id: I7b98f5be71068bbde70cc0eab991eaebb577de52
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