copySpec.duplicatesStrategy = duplicatesStrategy
            copySpec.includeEmptyDirs = includeEmptyDirs
            copySpec.isCaseSensitive = isCaseSensitive
            copySpec.filteringCharset = filteringCharset
            if (dirMode != null) {
                copySpec.dirPermissions.set(fileSystemOperations.permissions(dirMode))
            }
            if (fileMode != null) {

    public void setFilteringCharset(String charset) {
        Preconditions.checkNotNull(charset, "filteringCharset must not be null");
        if (!Charset.isSupported(charset)) {
            throw new InvalidUserDataException(String.format("filteringCharset %s is not supported by your JVM", charset));
        }
        this.filteringCharset = charset;
    }

    private static class MapBackedExpandAction implements Action<FileCopyDetails> {

            getInputs().property(specPropertyName + ".filePermissions", spec.getFilePermissions().map(FilePermissions::toUnixNumeric))
                .optional(true);
            getInputs().property(specPropertyName + ".filteringCharset", (Callable<String>) spec::getFilteringCharset);
        });
        this.getOutputs().doNotCacheIf(
            "Has custom actions",
            spec(task -> rootSpec.hasCustomActions())
        );

        "filePermissions"    | "filePermissions { unix(\"0600\") }"              | "filePermissions { unix(\"0644\") }"
        "filteringCharset"   | "filteringCharset = 'iso8859-1'"                  | "filteringCharset = 'utf-8'"
    }

    def "null action is forbidden for #method"() {
        given:
        buildScript """
            task copy(type: Copy) {