Commit 92fd30a9 authored by Jim Fulton's avatar Jim Fulton

Added an **experimental** extensions mechamism, mainly to support

adding sftp support to buildouts that need it.
parent e7af2d7d
...@@ -189,6 +189,12 @@ You can send questions to jim@zope.com. ...@@ -189,6 +189,12 @@ You can send questions to jim@zope.com.
Change History Change History
============== ==============
1.0.0b4
-------
Added an **experimental** extensions mechamism, mainly to support
adding sftp support to buildouts that need it.
1.0.0b3 1.0.0b3
------- -------
......
...@@ -137,6 +137,7 @@ class Buildout(dict): ...@@ -137,6 +137,7 @@ class Buildout(dict):
options['installed']) options['installed'])
self._setup_logging() self._setup_logging()
self._load_extensions()
def _dosubs(self, section, option, value, data, converted, seen): def _dosubs(self, section, option, value, data, converted, seen):
key = section, option key = section, option
...@@ -590,6 +591,22 @@ class Buildout(dict): ...@@ -590,6 +591,22 @@ class Buildout(dict):
args.insert(0, sys.executable) args.insert(0, sys.executable)
sys.exit(os.spawnv(os.P_WAIT, sys.executable, args)) sys.exit(os.spawnv(os.P_WAIT, sys.executable, args))
def _load_extensions(self):
specs = self['buildout'].get('extensions', '').split()
if specs:
if self['buildout'].get('offline') == 'true':
dest = None
else:
dest = self['buildout']['eggs-directory']
zc.buildout.easy_install.install(
specs, dest,
path=[self['buildout']['develop-eggs-directory']],
working_set=pkg_resources.working_set,
)
for ep in pkg_resources.iter_entry_points('zc.buildout.extension'):
ep.load()(self)
_spacey_nl = re.compile('[ \t\r\f\v]*\n[ \t\r\f\v\n]*' _spacey_nl = re.compile('[ \t\r\f\v]*\n[ \t\r\f\v\n]*'
'|' '|'
......
...@@ -1271,3 +1271,76 @@ Note that a basic setup.cfg was created for us. ...@@ -1271,3 +1271,76 @@ Note that a basic setup.cfg was created for us.
Note that the buildout script was installed but not run. To run Note that the buildout script was installed but not run. To run
the buildout, we'd have to run the installed buildout script. the buildout, we'd have to run the installed buildout script.
Extensions
----------
An **experimental** feature allows code to be loaded and run after
condiguration files have been read but before the buildout has begun
any processing. The intent is to allow special plugins such as
urllib2 request handlers to be loaded.
To load an extension, we use the extensions option and list one or
more distribution requirements, on separate lines. The distributions
named will be loaded and any zc.buildout.extensions entry points found
will be called with the buildout as an argument.
Let's create a sample extension in out sample buildout created in the
previous section:
>>> mkdir(sample_bootstrapped, 'demo')
>>> write(sample_bootstrapped, 'demo', 'demo.py',
... """
... def ext(buildout):
... print 'ext', list(buildout)
... """)
>>> write(sample_bootstrapped, 'demo', 'setup.py',
... """
... from setuptools import setup
...
... setup(
... name = "demo",
... entry_points = {'zc.buildout.extension': ['ext = demo:ext']},
... )
... """)
Our extension just prints out the word 'demo', and lists the sections
found in the buildout passed to it.
We'll update our buildout.cfg to list the demo directory as a develop
egg to be built:
>>> write(sample_bootstrapped, 'buildout.cfg',
... """
... [buildout]
... develop = demo
... parts =
... """)
>>> os.chdir(sample_bootstrapped)
>>> print system(os.path.join(sample_bootstrapped, 'bin', 'buildout')),
buildout: Develop: /sample-bootstrapped/demo/setup.py
Now we can add the extensions option. We were a bit tricly and ran
the buildout once with the demo develop egg defined but without the
extension option. This is because extensions are loaded before the
buildout creates develop eggs. We needed to use a separate buildout
run to create the develop egg. Normally, when eggs are loaded from
the network, we wouldn't need to do anything special.
>>> write(sample_bootstrapped, 'buildout.cfg',
... """
... [buildout]
... develop = demo
... extensions = demo
... parts =
... """)
We see that out extension is loaded and executed:
>>> print system(os.path.join(sample_bootstrapped, 'bin', 'buildout')),
ext ['buildout']
buildout: Develop: /tmp/tmpi0JFIIsample-bootstrapped/demo/setup.py
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