def initialize(self):
"""Instentiate VCS factories. This will detect if they are
available or not.
"""
__status__ = u"Detecting VCS systems."
if self._initialized:
return
for name, factory in working_set.iter_all_entry_points('setup_vcs'):
self._vcs[name] = factory()
self._initialized = True
def prepare(self, context):
__status__ = u"Preparing extensions sources."
installers = Installers()
for name, package in working_set.iter_all_entry_points(
'setup_extensions'):
if self.enabled is not None and name not in self.enabled:
continue
if not hasattr(package, '__path__'):
raise InstallationError(u"Invalid extension entry point", name)
directory = package.__path__[0]
for name in os.listdir(directory):
path = os.path.join(directory, name)
if os.path.isdir(path):
if name in installers:
raise InstallationError(
u'Duplicate extension source',
path,
installers[name])
installers.add(ExtractedPackageInstaller(
context, name=name, path=path))
if installers:
return Query(context, installers)
return None
