[release-1.11] 🐛Verify providers need upgrade before applying

cmd/clusterctl/client/cluster/upgrader.go

@@ -175,6 +175,15 @@ func (u *providerUpgrader) ApplyPlan(ctx context.Context, opts UpgradeOptions, c
 		return err
 	}
 
+	// Make sure there is something to upgrade, clear providers that do not
+	// need it
+	for i := len(upgradePlan.Providers) - 1; i >= 0; i-- {
+		if upgradePlan.Providers[i].NextVersion == "" {
+			// Remove this from our plan
+			upgradePlan.Providers = append(upgradePlan.Providers[:i], upgradePlan.Providers[i+1:]...)
+		}
+	}
+
 	// Do the upgrade
 	return u.doUpgrade(ctx, upgradePlan, opts)
 }

cmd/clusterctl/client/cluster/upgrader_test.go

@@ -1100,6 +1100,43 @@ func Test_providerUpgrader_ApplyPlan(t *testing.T) {
 			errorMsg: "detected multiple instances of the same provider",
 			opts:     UpgradeOptions{},
 		},
+		{
+			name: "does not fail when there is nothing to upgrade",
+			fields: fields{
+				// config for two providers
+				reader: test.NewFakeReader().
+					WithProvider("cluster-api", clusterctlv1.CoreProviderType, "https://somewhere.com").
+					WithProvider("infra", clusterctlv1.InfrastructureProviderType, "https://somewhere.com"),
+				// two provider repositories, with current v1alpha3 contract and new versions for v1alpha4 contract
+				repository: map[string]repository.Repository{
+					"cluster-api": repository.NewMemoryRepository().
+						WithDefaultVersion("v2.0.0").
+						WithVersions("v2.0.0").
+						WithMetadata("v2.0.0", &clusterctlv1.Metadata{
+							ReleaseSeries: []clusterctlv1.ReleaseSeries{
+								{Major: 1, Minor: 0, Contract: oldContractVersionNotSupportedAnymore},
+								{Major: 2, Minor: 0, Contract: currentContractVersion},
+							},
+						}),
+					"infrastructure-infra": repository.NewMemoryRepository().
+						WithDefaultVersion("v3.0.0").
+						WithVersions("v3.0.0").
+						WithMetadata("v3.0.0", &clusterctlv1.Metadata{
+							ReleaseSeries: []clusterctlv1.ReleaseSeries{
+								{Major: 2, Minor: 0, Contract: oldContractVersionNotSupportedAnymore},
+								{Major: 3, Minor: 0, Contract: currentContractVersion},
+							},
+						}),
+				},
+				// two providers with up to date versions
+				proxy: test.NewFakeProxy().
+					WithProviderInventory("cluster-api", clusterctlv1.CoreProviderType, "v2.0.0", "cluster-api-system").
+					WithProviderInventory("infra", clusterctlv1.InfrastructureProviderType, "v3.0.0", "infra-system-1"),
+			},
+			contract: currentContractVersion,
+			wantErr:  false,
+			opts:     UpgradeOptions{},
+		},
 	}
 
 	for _, tt := range tests {