From 20498936b79906dfcb31a84cfd9e97ee20c94147 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Tue, 24 May 2011 19:52:17 -0700
Subject: depgraph: detect deps broken by autounmask

This will fix bug #368429.
---
 pym/_emerge/depgraph.py | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'pym/_emerge')

diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 34639258e..fec23779a 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -2740,15 +2740,18 @@ class depgraph(object):
 
 
 	def _show_unsatisfied_dep(self, root, atom, myparent=None, arg=None,
-		check_backtrack=False):
+		check_backtrack=False, check_autounmask_breakage=False):
 		"""
 		When check_backtrack=True, no output is produced and
 		the method either returns or raises _backtrack_mask if
 		a matching package has been masked by backtracking.
 		"""
 		backtrack_mask = False
+		autounmask_broke_use_dep = False
 		atom_set = InternalPackageSet(initial_atoms=(atom.without_use,),
 			allow_repo=True)
+		atom_set_with_use = InternalPackageSet(initial_atoms=(atom,),
+			allow_repo=True)
 		xinfo = '"%s"' % atom.unevaluated_atom
 		if arg:
 			xinfo='"%s"' % arg
@@ -2823,6 +2826,8 @@ class depgraph(object):
 									or atom.violated_conditionals(self._pkg_use_enabled(pkg), pkg.iuse.is_valid_flag).use:
 									missing_use.append(pkg)
 									if not mreasons:
+										if atom_set_with_use.findAtomForPackage(pkg):
+											autounmask_broke_use_dep = True
 										continue
 							except InvalidAtom:
 								writemsg("violated_conditionals raised " + \
@@ -2855,6 +2860,12 @@ class depgraph(object):
 			else:
 				return
 
+		if check_autounmask_breakage:
+			if autounmask_broke_use_dep:
+				raise self._autounmask_breakage()
+			else:
+				return
+
 		missing_use_reasons = []
 		missing_iuse_reasons = []
 		for pkg in missing_use:
@@ -6342,6 +6353,13 @@ class depgraph(object):
 		backtracking.
 		"""
 
+	class _autounmask_breakage(_internal_exception):
+		"""
+		This is raised by _show_unsatisfied_dep() when it's called with
+		check_autounmask_breakage=True and a matching package has been
+		been disqualified due to autounmask changes.
+		"""
+
 	def need_restart(self):
 		return self._dynamic_config._need_restart and \
 			not self._dynamic_config._skip_restart
@@ -6349,6 +6367,15 @@ class depgraph(object):
 	def success_without_autounmask(self):
 		return self._dynamic_config._success_without_autounmask
 
+	def autounmask_breakage_detected(self):
+		try:
+			for pargs, kwargs in self._dynamic_config._unsatisfied_deps_for_display:
+				self._show_unsatisfied_dep(
+					*pargs, check_autounmask_breakage=True, **kwargs)
+		except self._autounmask_breakage:
+			return True
+		return False
+
 	def get_backtrack_infos(self):
 		return self._dynamic_config._backtrack_infos
 			
@@ -6640,6 +6667,15 @@ def _backtrack_depgraph(settings, trees, myopts, myparams, myaction, myfiles, sp
 			allow_backtracking=False,
 			backtrack_parameters=backtracker.get_best_run())
 		success, favorites = mydepgraph.select_files(myfiles)
+		if not success and mydepgraph.autounmask_breakage_detected():
+			if "--debug" in myopts:
+				writemsg_level(
+					"\n\nautounmask breakage detectedn\n",
+					noiselevel=-1, level=logging.DEBUG)
+			myopts["--autounmask"] = "n"
+			mydepgraph = depgraph(settings, trees, myopts, myparams, spinner,
+				frozen_config=frozen_config, allow_backtracking=False)
+			success, favorites = mydepgraph.select_files(myfiles)
 
 	return (success, mydepgraph, favorites)
 
-- 
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