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Bug 615824 - sys-apps/portage: emerge fails to report slot conflicts involving autounmask USE changes
Summary: sys-apps/portage: emerge fails to report slot conflicts involving autounmask ...
Alias: None
Product: Portage Development
Classification: Unclassified
Component: Core - Interface (emerge) (show other bugs)
Hardware: All All
: Normal normal (vote)
Assignee: Portage team
Depends on:
Blocks: 300071
  Show dependency tree
Reported: 2017-04-17 08:41 UTC by Zac Medico
Modified: 2019-09-23 01:13 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Zac Medico gentoo-dev 2017-04-17 08:41:49 UTC
While testing changes for bug 615680, I found that emerge fails to report slot conflicts triggered by autounmask USE changes. The problem is that the _check_slot_conflict fails to identify the slot conflict, since it only sees one package instance, when there should actually be 2 different instances with different USE settings. The problem can be solved by making _check_slot_conflict check if all parent atoms match pkg, and making _add_pkg use pkg.with_use(self._pkg_use_enabled(pkg)) to generate a second package instance (this will cause PackageTracker to recognize the slot conflict). The following test case triggers the problem:

from portage.tests import TestCase
from portage.tests.resolver.ResolverPlayground import (

class AutounmaskUseSlotConflictTestCase(TestCase):

	def testAutounmaskUseSlotConflict(self):

		ebuilds = {
			"sci-libs/K-1": {
				"IUSE": "+foo",
				"EAPI": 1
			"sci-libs/L-1": {
				"DEPEND": "sci-libs/K[-foo]",
				"EAPI": 2
			"sci-libs/M-1": {
				"DEPEND": "sci-libs/K[foo=]",
				"IUSE": "+foo",
				"EAPI": 2

		installed = {}

		test_cases = (
				["sci-libs/L", "sci-libs/M"],
				options={"--backtrack": 0},
				success = False,
				mergelist = [
				ignore_mergelist_order = True,
				slot_collision_solutions = [
						"sci-libs/K-1": {"foo": False},
						"sci-libs/M-1": {"foo": False}

		playground = ResolverPlayground(
			ebuilds=ebuilds, installed=installed, debug=True)
			for test_case in test_cases:
					True, test_case.fail_msg)
			playground.debug = False
Comment 1 Zac Medico gentoo-dev 2017-04-17 09:21:20 UTC
If we're going to add pkg.with_use(self._pkg_use_enabled(pkg)) to the graph, then we need to add USE to the hash key. Also, the way that _pkg_use_enabled is used everywhere needs to be carefully considered. Maybe it will be okay as long as USE is part of the hash key.
Comment 2 Zac Medico gentoo-dev 2017-04-24 07:06:41 UTC
Fixing this bug will require significant changes, and it shouldn't block bug 615680.