TrackingProperties(System.getProperties().uncheckedCast()) { prefix, snapshot ->
            listener.systemPropertiesPrefixedBy(prefix, snapshot)
        }

    override fun getVariables(): Environment.Properties =
        TrackingProperties(System.getenv()) { prefix, snapshot ->
            listener.envVariablesPrefixedBy(prefix, snapshot)
        }

    private
    class TrackingProperties(

    /**
     * Checks whether a given artifact version is considered a {@code SNAPSHOT} or not.
     * <p>
     * Shortcut for {@code getService(ArtifactManager.class).isSnapshot(...)}.
     * <p>
     * In case there is {@link Artifact} in scope, the recommended way to perform this check is
     * use of {@link Artifact#isSnapshot()} instead.
     *
     * @param version artifact version

        InstrumentationTypeRegistry typeRegistry
    ) {
        FileSystemLocationSnapshot snapshot = snapshotOf(original);
        if (snapshot.getType() == FileType.Missing) {
            return empty();
        }
        if (shouldUseFromCache(original)) {
            final HashCode contentHash = snapshot.getHash();
            if (!seen.add(contentHash)) {

        when(project.getPackaging()).thenReturn("jar");
        when(project.getName()).thenReturn("Apache Maven Embedder");
        when(project.getVersion()).thenReturn("3.5.4-SNAPSHOT");
        when(project.getFile()).thenReturn(new File(basedir, "maven-embedder/pom.xml"));
        when(event.getProject()).thenReturn(project);

        MavenProject rootProject = mock(MavenProject.class);

 * limitations under the License.
 */

package org.gradle.internal.cc.impl.models

import org.gradle.internal.hash.HashCode
import org.gradle.internal.hash.Hashing
import org.gradle.internal.snapshot.ValueSnapshotter
import org.gradle.tooling.internal.adapter.ProtocolToModelAdapter
import org.gradle.tooling.internal.consumer.connection.ToolingParameterProxy

        String getSnapshotVersion() {
            return "2.0-SNAPSHOT"
        }

        @Override
        String getNewSnapshotVersion() {
            return snapshotVersion
        }

        @Override
        String getNewSnapshotInvalidatedResource() {
            return "file 'maven_home/.m2/repository/thing/lib1/2.0-SNAPSHOT/lib1-2.0-SNAPSHOT.pom'".replace('/', File.separator)
        }

    override fun systemPropertiesPrefixedBy(prefix: String, snapshot: Map<String, String?>) {
        if (isInputTrackingDisabled()) {
            return
        }
        addSystemPropertiesPrefixedByToFingerprint(prefix, snapshot)
    }

    private
    fun addSystemPropertiesPrefixedByToFingerprint(prefix: String, snapshot: Map<String, String?>) {
        val filteredSnapshot = snapshot.mapValues { e ->

        override val reason: String
            get() = "cached artifact information for $displayName has expired"
    }

    data class SystemPropertiesPrefixedBy(
        val prefix: String,
        val snapshot: Map<String, Any?>
    ) : ConfigurationCacheFingerprint() {
        companion object {
            /**
             * The placeholder for system properties modified by the build logic at the time of

import org.gradle.internal.hash.Hasher
import org.gradle.internal.instrumentation.agent.AgentStatus
import org.gradle.internal.serialize.ClassLoaderObjectInputStream
import org.gradle.internal.snapshot.FileSystemLocationSnapshot
import org.gradle.internal.snapshot.FileSystemSnapshot
import org.gradle.test.fixtures.archive.ZipTestFixture
import org.gradle.test.fixtures.concurrent.ConcurrentSpec
import org.gradle.test.fixtures.file.TestFile

                    // values doesn't matter.
                    snapshot[it] != ConfigurationCacheFingerprint.SystemPropertiesPrefixedBy.IGNORED
                }
                val snapshotWithoutIgnored = snapshot.filterValues {
                    // remove placeholders of modified properties to only compare relevant values.