// occurred at a module found along the given path of requirements and/or
// upgrades, which must be non-empty.
//
// The isVersionChange function reports whether a path step is due to an
// explicit upgrade or downgrade (as opposed to an existing requirement in a
// go.mod file). A nil isVersionChange function indicates that none of the path
// steps are due to explicit version changes.

    def ivyHttpRepo = new IvyHttpRepository(server, new IvyFileRepository(file("ivy-repo")))

    def setup() {
        requireOwnGradleUserHomeDir()
        server.start()
    }

    def "can upgrade and downgrade Gradle version"() {
        given:
        mavenHttpRepo.module("test", "io", "1.4").publish()
        mavenHttpRepo.module("test", "lang", "2.4").publish()
        mavenHttpRepo.module("test", "lang", "2.6").publish()

stderr '^go: removed toolchain go1.999testmod$'
grep 'go 1.23.9' go.mod
! grep 'toolchain go1.23.9' go.mod  # implied

# go get toolchain@go1.22 should use the latest Go 1.22 and downgrade go.
go get toolchain@go1.22
stderr '^go: downgraded go 1.23.9 => 1.22.9$'
grep 'go 1.22.9' go.mod
! grep 'toolchain go1.22.9' go.mod # implied

# go get toolchain@patch should use the latest patch release
go get toolchain@go1.22.1

# This test illustrates a case where an upgrade–downgrade–upgrade cycle can
# result in upgrades of otherwise-irrelevant dependencies.
#
# This case has no corresponding test in the mvs package, because it is an
# artifact that results from the composition of *multiple* MVS operations.

# The initial package import graph used in the test looks like:
#
# m ---- a
# |      |
# +----- b
# |      |
# +----- c
# |
# +----- d
#

    }

    private String suggestDowngradePlugin(String pluginId) {
        return "Downgrade plugin " + pluginId + " to an older version compatible with " + currentGradleVersion + ".";
    }

	cfg.HSTSPreload = hstsPreload

	referrerPolicy := env.Get(EnvBrowserReferrerPolicy, kvs.GetWithDefault(browserReferrerPolicy, DefaultKVS))
	switch referrerPolicy {
	case "no-referrer", "no-referrer-when-downgrade", "origin", "origin-when-cross-origin", "same-origin", "strict-origin", "strict-origin-when-cross-origin", "unsafe-url":
		cfg.ReferrerPolicy = referrerPolicy
	default:

		// If a resource has to be stored in a version that is not the
		// latest, then it can be listed here. Usually this is the case
		// when a new version for a resource gets introduced and a
		// downgrade to an older apiserver that doesn't know the new
		// version still needs to be supported for one release.
		//
		// Example from Kubernetes 1.24 where csistoragecapacities had just
		// graduated to GA:
		//

        output.contains "org.jacoco:org.jacoco.ant:"
    }

    def "allows configuring tool dependencies explicitly"() {
        when:
        buildFile << """
            dependencies {
                //downgrade version:
                jacocoAgent "org.jacoco:org.jacoco.agent:0.6.0.201210061924"
                jacocoAnt "org.jacoco:org.jacoco.ant:0.6.0.201210061924"
            }
        """

		// When Server Side Apply is not enabled, fallback to Update. This is required when running
		// 1.21 since api-server can be 1.20 during the upgrade/downgrade.
		// Since Server Side Apply is enabled by default in Beta, this fallback only kicks in
		// if the feature has been disabled using its feature flag.
		err = c.updateClusterRoles(ctx, sharedClusterRole, newPolicyRules)
	}

	flags.Uint64Var(&opts.port, "port", 0,
		"etcd client port to use during migration operations. "+
			"This should be a different port than typically used by etcd to avoid clients accidentally connecting during upgrade/downgrade operations. "+
			"If unset default to 18629 or 18631 depending on <data-dir>.")
	flags.Uint64Var(&opts.peerPort, "peer-port", 0,