depgraph: detect deps broken by autounmask

This will fix bug #368429.

1 files changed, 40 insertions, 1 deletions

diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 21d5c1952..5f74b6deb 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -2479,14 +2479,17 @@ 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,))
+		atom_set_with_use = InternalPackageSet(initial_atoms=(atom,),
+			allow_repo=True)
 		xinfo = '"%s"' % atom.unevaluated_atom
 		if arg:
 			xinfo='"%s"' % arg
@@ -2553,6 +2556,8 @@ 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 " + \
@@ -2580,6 +2585,12 @@ 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:
@@ -5708,10 +5719,26 @@ 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
 
+	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_parameters(self):
 		return {
 			"needed_unstable_keywords":
@@ -5994,6 +6021,18 @@ def _backtrack_depgraph(settings, trees, myopts, myparams,
 				break
 		else:
 			break
+
+	if not success and mydepgraph.autounmask_breakage_detected():
+		if "--debug" in myopts:
+			writemsg_level(
+				"\n\nautounmask breakage detected\n\n",
+				noiselevel=-1, level=logging.DEBUG)
+		myopts["--autounmask"] = "n"
+		mydepgraph = depgraph(settings, trees, myopts, myparams, spinner,
+			frozen_config=frozen_config,
+			allow_backtracking=allow_backtracking)
+		success, favorites = mydepgraph.select_files(myfiles)
+
 	return (success, mydepgraph, favorites)
 
 def resume_depgraph(settings, trees, mtimedb, myopts, myparams, spinner):