Merged in the portage-2.2 branch

1 files changed, 21 insertions, 1 deletions

diff --git a/portato/backend/system_interface.py b/portato/backend/system_interface.py
index 4b0f8df..1cb0ed1 100644
--- a/portato/backend/system_interface.py
+++ b/portato/backend/system_interface.py
@@ -11,6 +11,26 @@
 # Written by René 'Necoro' Neumann <necoro@necoro.net>
 
 class SystemInterface (object):
+	
+	SET_ALL = "__portato_all__"
+	SET_TREE = "__portato_tree__"
+	SET_INSTALLED = "__portato_installed__"
+	SET_UNINSTALLED = "__portato_uninstalled__"
+
+	def has_set_support (self):
+		"""Signals, whether this backend supports sets.
+
+		@rtype: boolean
+		"""
+		raise NotImplementedError
+
+	def get_sets (self):
+		"""Returns all supported sets in tuples consisting of name and description.
+		If sets aren't supported, at least "world" and "system" have to be returned.
+
+		@rtype: iter(string, string)
+		"""
+		raise NotImplementedError
 
 	def get_version (self):
 		"""Returns the version of the used backend.
@@ -75,7 +95,7 @@ class SystemInterface (object):
 
 		raise NotImplementedError
 
-	def find_packages (self, key, pkgSet = "all", masked = False, with_version = True, only_cpv = False):
+	def find_packages (self, key, pkgSet = SET_ALL, masked = False, with_version = True, only_cpv = False):
 		"""This returns a list of packages matching the key.
 		As key, it is allowed to use basic regexps (".*") and the normal package specs. But not a combination
 		of them.