[gentoo-portage-dev] [PATCH] sets: introduce @changed-deps to update packages which need dep changes.

["Michał Górny" <mgorny@gentoo.org>]

The @changed-deps set tries to compare RDEPEND and PDEPEND entries of
installed packages with ebuild counterparts, and pulls the ebuild
whenever the two are not in sync. This could be used, for example, to
clean up the system after disabling --dynamic-deps.
---
 cnf/sets/portage.conf      |  5 +++++
 pym/portage/_sets/dbapi.py | 53 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/cnf/sets/portage.conf b/cnf/sets/portage.conf
index b73afb1..fd2c387 100644
--- a/cnf/sets/portage.conf
+++ b/cnf/sets/portage.conf
@@ -84,3 +84,8 @@ class = portage.sets.dbapi.UnavailableSet
 # are not available.
 [unavailable-binaries]
 class = portage.sets.dbapi.UnavailableBinaries
+
+# Installed packages for which vdb *DEPEND entries are outdated compared
+# to the matching portdb entry.
+[changed-deps]
+class = portage.sets.dbapi.ChangedDepsSet
diff --git a/pym/portage/_sets/dbapi.py b/pym/portage/_sets/dbapi.py
index 384fb3a..9b2cb8b 100644
--- a/pym/portage/_sets/dbapi.py
+++ b/pym/portage/_sets/dbapi.py
@@ -1,17 +1,18 @@
 # Copyright 2007-2012 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
+import re
 import time
 
 from portage import os
 from portage.versions import best, catsplit, vercmp
-from portage.dep import Atom
+from portage.dep import Atom, use_reduce
 from portage.localization import _
 from portage._sets.base import PackageSet
 from portage._sets import SetConfigError, get_boolean
 import portage
 
-__all__ = ["CategorySet", "DowngradeSet",
+__all__ = ["CategorySet", "ChangedDepsSet", "DowngradeSet",
 	"EverythingSet", "OwnerSet", "VariableSet"]
 
 class EverythingSet(PackageSet):
@@ -456,3 +457,51 @@ class RebuiltBinaries(EverythingSet):
 			bindb=trees["bintree"].dbapi)
 
 	singleBuilder = classmethod(singleBuilder)
+
+class ChangedDepsSet(PackageSet):
+
+	_operations = ["merge", "unmerge"]
+
+	description = "Package set which contains all installed " + \
+		"packages for which the vdb *DEPEND entries are outdated " + \
+		"compared to corresponding portdb entries."
+
+	def __init__(self, portdb=None, vardb=None):
+		super(ChangedDepsSet, self).__init__()
+		self._portdb = portdb
+		self._vardb = vardb
+
+	def load(self):
+		depvars = ('RDEPEND', 'PDEPEND')
+
+		subslot_repl_re = re.compile(r':[^[]*=')
+
+		atoms = []
+		for cpv in self._vardb.cpv_all():
+			# no ebuild, no dynamic-deps to break it :)
+			if not self._portdb.cpv_exists(cpv):
+				continue
+
+			use, eapi = self._vardb.aux_get(cpv, ('USE', 'EAPI'))
+
+			def clean_subslots(depatom):
+				if isinstance(depatom, list):
+					return [clean_subslots(x) for x in depatom]
+				else:
+					return subslot_repl_re.sub(':=', depatom)
+
+			vdbvars = [clean_subslots(use_reduce(x, uselist=use, eapi=eapi))
+					for x in self._vardb.aux_get(cpv, depvars)]
+			pdbvars = [clean_subslots(use_reduce(x, uselist=use, eapi=eapi))
+					for x in self._portdb.aux_get(cpv, depvars)]
+
+			if vdbvars != pdbvars:
+				atoms.append('=%s' % cpv)
+
+		self._setAtoms(atoms)
+
+	def singleBuilder(cls, options, settings, trees):
+		return cls(portdb=trees["porttree"].dbapi,
+			vardb=trees["vartree"].dbapi)
+
+	singleBuilder = classmethod(singleBuilder)
-- 
2.0.2