<<<pom.baseUri>>> (<deprecated>) | the directory containing the <<<pom.xml>>> file as URI | <<<$\{project.baseUri\}>>> |
*----+------+------+
| <<<project.rootDirectory>>> | the project's root directory (containing a <<<.mvn>>> directory or with the <<<root="true">>> xml attribute) | <<<$\{project.rootDirectory\}>>> |
*----+------+------+
| <<<build.timestamp>>>\

        Files.writeString(mavenUserProps, "${includes} = ?${session.rootDirectory}/.mvn/maven-user.properties\n");
        Path rootDirectory = fs.getPath("C:\\myRootDirectory");
        Path topDirectory = rootDirectory.resolve("myTopDirectory");
        Path mvn = rootDirectory.resolve(".mvn");
        Files.createDirectories(mvn);
        Files.writeString(

        user.put("session.topDirectory", invokerRequest.topDirectory().toString());
        if (invokerRequest.rootDirectory().isPresent()) {
            user.put(
                    "session.rootDirectory",
                    invokerRequest.rootDirectory().get().toString());
        }
        this.protoSession = ProtoSession.newBuilder()
                .withSystemProperties(invokerRequest.systemProperties())

    }

    @Test
    void specials() {
        InvokerRequest invokerRequest = subject.parseInvocation(ParserRequest.mvn(
                        Arrays.asList("-Dfoo=${session.rootDirectory}", "-X"), mock(MessageBuilderFactory.class))
                .cwd(Path.of(System.getProperty("userDir")))
                .userHome(Path.of(System.getProperty("userHome")))
                .build());

                throw new IllegalArgumentException("Specified file does not exists (" + file + ")");
            }
        }
        // maven.config; if exists
        Path mavenConfig = context.rootDirectory != null ? context.rootDirectory.resolve(".mvn/maven.config") : null;
        if (mavenConfig != null && Files.isRegularFile(mavenConfig)) {
            result.add(parseMavenConfigOptions(mavenConfig));
        }

    }

    private File getRootProject(MavenExecutionRequest request) {
        Path rootDirectory = request.getRootDirectory();
        if (request.getPom().getParentFile().toPath().equals(rootDirectory)) {
            return request.getPom();
        } else {
            Path rootProjectPom = modelProcessor.locateExistingPom(rootDirectory);
            if (rootProjectPom == null) {
                LOGGER.info(

    public static Path findRoot(Path topDirectory) {
        requireNonNull(topDirectory, "topDirectory");
        Path rootDirectory =
                ServiceLoader.load(RootLocator.class).iterator().next().findRoot(topDirectory);
        if (rootDirectory != null) {
            return getCanonicalPath(rootDirectory);
        }
        return null;
    }

    @Nonnull

        // This is used to compute {@code session.rootDirectory} but all {@code project.rootDirectory}
        // properties will be computed through the RootLocator found in the container.
        RootLocator rootLocator =
                ServiceLoader.load(RootLocator.class).iterator().next();
        cliRequest.rootDirectory = rootLocator.findRoot(topDirectory);

        //

            Map<String, String> extra = new HashMap<>();
            extra.put("session.topDirectory", topDirectory.toString());
            if (rootDirectory != null) {
                extra.put("session.rootDirectory", rootDirectory.toString());
            }
            return extra;
        }
    }

    @Override
    public InvokerRequest parseInvocation(ParserRequest parserRequest) {

# system properties at the very beginning of Maven's boot process.
#

maven.installation.conf = ${maven.home}/conf
maven.user.conf         = ${user.home}/.m2
maven.project.conf      = ${session.rootDirectory}/.mvn

# Comma-separated list of files to include.
# Each item may be enclosed in quotes to gracefully include spaces. Items are trimmed before being loaded.