diff options
Diffstat (limited to 'portato/backend/__init__.py')
| -rw-r--r-- | portato/backend/__init__.py | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/portato/backend/__init__.py b/portato/backend/__init__.py index 83ee1d6..c3de443 100644 --- a/portato/backend/__init__.py +++ b/portato/backend/__init__.py @@ -10,32 +10,47 @@ # # Written by René 'Necoro' Neumann <necoro@necoro.net> +from exceptions import * from system_interface import SystemInterface -SYSTEM = "portage" -_sys = None +SYSTEM = "portage" # the name of the current system +_sys = None # the SystemInterface-instance class SystemWrapper (object, 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.""" + def __getattribute__ (self, name): + """Just pass all attribute accesses directly to _sys.""" global _sys return eval ("_sys.%s" % name) def set_system (new_sys): + """Sets the current system to a new one. + + @param new_sys: the name of the system to take + @type new_sys: string""" + global SYSTEM SYSTEM = new_sys load_system() def load_system (): + """Loads the current chosen system. + + @raises InvalidSystemError: if an inappropriate system is set""" + global _sys if SYSTEM == "portage": from portato.backend.portage import PortageSystem _sys = PortageSystem () + else: + raise InvalidSystemError, SYSTEM system = SystemWrapper() -from exceptions import * +# import package before loading the system as some systems may depend on it being in the namespace from package import Package load_system() - |