diff options
Diffstat (limited to 'portato/backend/__init__.py')
| -rw-r--r-- | portato/backend/__init__.py | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/portato/backend/__init__.py b/portato/backend/__init__.py index d1d61e8..92b77a8 100644 --- a/portato/backend/__init__.py +++ b/portato/backend/__init__.py @@ -10,12 +10,21 @@ # # Written by René 'Necoro' Neumann <necoro@necoro.net> -from exceptions import * -from system_interface import SystemInterface +from __future__ import absolute_import + +from .system_interface import SystemInterface +from .exceptions import BlockedException, PackageNotFoundException, DependencyCalcError, InvalidSystemError SYSTEM = "portage" # the name of the current system _sys = None # the SystemInterface-instance +class _Package (object): + """Wrapping class from which L{portato.backend.Package} inherits. This is used by the flags module to check + whether an object is a package. It cannot use the normal Package class as this results in cyclic dependencies.""" + + def __init__ (self): + raise TypeError, "Calling __init__ on portato.backend._Package objects is not allowed." + class SystemWrapper (SystemInterface): """This is a wrapper to the different system interfaces, allowing the direct import via C{from portato.backend import system}. With this wrapper a change of the system is propagated to all imports.""" @@ -42,7 +51,7 @@ def load_system (): global _sys if SYSTEM == "portage": - from portato.backend.portage import PortageSystem + from .portage import PortageSystem _sys = PortageSystem () else: raise InvalidSystemError, SYSTEM @@ -50,6 +59,9 @@ def load_system (): system = SystemWrapper() # import package before loading the system as some systems may depend on it being in the namespace -from package import Package +from .package import Package + +def is_package(what): + return isinstance(what, Package) load_system() |