Backports to 6x

subprojects/dependency-management/src/integTest/groovy/org/gradle/integtests/resolve/attributes/DependenciesAttributesIntegrationTest.groovy

@@ -506,6 +506,65 @@ class DependenciesAttributesIntegrationTest extends AbstractModuleDependencyReso
         'c1'               | 'c2'            | 'runtime'       | ['org.gradle.status': defaultStatus(), 'org.gradle.usage': 'java-runtime', 'org.gradle.libraryelements': 'jar', 'org.gradle.category': 'library', custom: 'c2']
     }
 
+    @Issue("https://github.com/gradle/gradle/issues/20182")
+    @RequiredFeature(feature = GradleMetadataResolveRunner.GRADLE_METADATA, value = "true")
+    @Unroll("Selects variant #expectedVariant using custom attribute value #dependencyValue overriding configuration attribute #configurationValue using dependency constraint without version")
+    def "dependency attribute value overrides configuration attribute using dependency constraint without version"() {
+        given:
+        repository {
+            'org:test:1.0' {
+                variant('api') {
+                    attribute('custom', 'c1')
+                }
+                variant('runtime') {
+                    attribute('custom', 'c2')
+                }
+            }
+        }
+
+        buildFile << """
+            configurations.conf.attributes.attribute(CUSTOM_ATTRIBUTE, '$configurationValue')
+
+            dependencies {
+                constraints {
+                    conf('org:test') {
+                       attributes {
+                          attribute(CUSTOM_ATTRIBUTE, '$dependencyValue')
+                       }
+                    }
+                }
+                conf 'org:test:1.0'
+            }
+        """
+
+        when:
+        repositoryInteractions {
+            'org:test:1.0' {
+                expectResolve()
+            }
+        }
+        succeeds 'checkDeps'
+
+        then:
+        resolve.expectGraph {
+            root(":", ":test:") {
+                module('org:test:1.0') {
+                    configuration = expectedVariant
+                    variant(expectedVariant, expectedAttributes)
+                }
+                constraint('org:test', 'org:test:1.0') {
+                    configuration = expectedVariant
+                    variant(expectedVariant, expectedAttributes)
+                }
+            }
+        }
+
+        where:
+        configurationValue | dependencyValue | expectedVariant | expectedAttributes
+        'c2'               | 'c1'            | 'api'           | ['org.gradle.status': defaultStatus(), 'org.gradle.usage': 'java-api', 'org.gradle.libraryelements': 'jar', 'org.gradle.category': 'library', custom: 'c1']
+        'c1'               | 'c2'            | 'runtime'       | ['org.gradle.status': defaultStatus(), 'org.gradle.usage': 'java-runtime', 'org.gradle.libraryelements': 'jar', 'org.gradle.category': 'library', custom: 'c2']
+    }
+
     @RequiredFeature(feature = GradleMetadataResolveRunner.GRADLE_METADATA, value = "true")
     @ToBeFixedForConfigurationCache
     def "Fails resolution because consumer configuration attributes and constraint attributes conflict"() {

subprojects/dependency-management/src/main/java/org/gradle/api/internal/artifacts/dsl/dependencies/DefaultDependencyConstraintHandler.java

@@ -189,26 +189,26 @@ private DependencyConstraint doAdd(Configuration configuration, Object dependenc
         return dependency;
     }
 
-    private DependencyConstraint doAddProvider(Configuration configuration, Provider<?> dependencyNotation, Action<? super DependencyConstraint> configureAction) {
+    private DependencyConstraint doAddProvider(Configuration configuration, Provider<?> dependencyNotation, @Nullable Action<? super DependencyConstraint> configureAction) {
         Provider<DependencyConstraint> lazyConstraint = dependencyNotation.map(mapDependencyConstraintProvider(configureAction));
         configuration.getDependencyConstraints().addLater(lazyConstraint);
         // Return a fake dependency constraint object to satisfy Kotlin DSL backwards compatibility
         return DUMMY_CONSTRAINT;
     }
 
-    private DependencyConstraint doAddListProvider(Configuration configuration, Provider<?> dependencyNotation, Action<? super DependencyConstraint>  configureAction) {
+    private DependencyConstraint doAddListProvider(Configuration configuration, Provider<?> dependencyNotation, @Nullable Action<? super DependencyConstraint>  configureAction) {
         // workaround for the fact that mapping to a list will not create a `CollectionProviderInternal`
         ListProperty<DependencyConstraint> constraints = objects.listProperty(DependencyConstraint.class);
         constraints.set(dependencyNotation.map(notation -> {
             List<MinimalExternalModuleDependency> deps = Cast.uncheckedCast(notation);
-            return deps.stream().map(d -> create(d, configureAction)).collect(Collectors.toList());
+            return deps.stream().map(d -> doCreate(d, configureAction)).collect(Collectors.toList());
         }));
         configuration.getDependencyConstraints().addAllLater(constraints);
         return DUMMY_CONSTRAINT;
     }
 
-    private <T> Transformer<DependencyConstraint, T> mapDependencyConstraintProvider(Action<? super DependencyConstraint> configurationAction) {
-        return lazyNotation -> create(lazyNotation, configurationAction);
+    private <T> Transformer<DependencyConstraint, T> mapDependencyConstraintProvider(@Nullable Action<? super DependencyConstraint> configurationAction) {
+        return lazyNotation -> doCreate(lazyNotation, configurationAction);
     }
 
     @Override

subprojects/dependency-management/src/main/java/org/gradle/api/internal/artifacts/ivyservice/ivyresolve/parser/GradleModuleMetadataParser.java

@@ -439,7 +439,7 @@ private List<ModuleDependencyConstraint> consumeDependencyConstraints(JsonReader
             String group = null;
             String module = null;
             String reason = null;
-            VersionConstraint version = null;
+            VersionConstraint version = DefaultImmutableVersionConstraint.of();
             ImmutableAttributes attributes = ImmutableAttributes.EMPTY;
 
             reader.beginObject();

subprojects/dependency-management/src/main/java/org/gradle/api/internal/notations/DependencyConstraintNotationParser.java

@@ -98,12 +98,12 @@ private final static class UnsupportedCapabilitiesHandler implements ModuleDepen
 
         @Override
         public void requireCapability(Object capabilityNotation) {
-            throw new InvalidUserDataException("Capabilies are not supported by dependency constraints");
+            throw new InvalidUserDataException("Capabilities are not supported by dependency constraints");
         }
 
         @Override
         public void requireCapabilities(Object... capabilityNotations) {
-            throw new InvalidUserDataException("Capabilies are not supported by dependency constraints");
+            throw new InvalidUserDataException("Capabilities are not supported by dependency constraints");
         }
     }
 }

subprojects/dependency-management/src/test/groovy/org/gradle/api/internal/artifacts/ivyservice/ivyresolve/parser/GradleModuleMetadataParserTest.groovy

@@ -381,7 +381,8 @@ class GradleModuleMetadataParserTest extends Specification {
                         "group": "g3",
                         "module": "m3",
                         "version": { "requires": "v3" }
-                    }
+                    },
+                    { "group": "g4", "module": "m4" }
                 ],
                 "attributes": { "usage": "compile" }
             },
@@ -404,6 +405,7 @@ class GradleModuleMetadataParserTest extends Specification {
         1 * variant1.addDependencyConstraint("g1", "m1", requires("v1"), null, ImmutableAttributes.EMPTY)
         1 * variant1.addDependencyConstraint("g2", "m2", prefers("v2"), null, ImmutableAttributes.EMPTY)
         1 * variant1.addDependencyConstraint("g3", "m3", requires("v3"), null, ImmutableAttributes.EMPTY)
+        1 * variant1.addDependencyConstraint("g4", "m4", emptyConstraint(), null, ImmutableAttributes.EMPTY)
         1 * variant1.setAvailableExternally(false)
         1 * metadata.addVariant("runtime", attributes(usage: "runtime", packaging: "zip")) >> variant2
         1 * variant2.addDependencyConstraint("g3", "m3", prefers("v3"), null, ImmutableAttributes.EMPTY)

subprojects/messaging/src/main/java/org/gradle/internal/serialize/kryo/KryoBackedDecoder.java

@@ -168,21 +168,30 @@ public void skipChunked() throws EOFException, IOException {
     public <T> T decodeChunked(DecodeAction<Decoder, T> decodeAction) throws EOFException, Exception {
         if (nested == null) {
             nested = new KryoBackedDecoder(new InputStream() {
+                private int leftover = 0;
+
                 @Override
                 public int read() throws IOException {
                     throw new UnsupportedOperationException();
                 }
 
                 @Override
                 public int read(byte[] buffer, int offset, int length) throws IOException {
+                    if (leftover > 0) {
+                        int count = Math.min(leftover, length);
+                        leftover -= count;
+                        readBytes(buffer, offset, count);
+                        return count;
+                    }
+
                     int count = readSmallInt();
                     if (count == 0) {
                         // End of stream has been reached
                         return -1;
                     }
                     if (count > length) {
-                        // For now, assume same size buffers used to read and write
-                        throw new UnsupportedOperationException();
+                        leftover = count - length;
+                        count = length;
                     }
                     readBytes(buffer, offset, count);
                     return count;