JNI hello world

dhfs-parent/pom.xml

@@ -13,6 +13,7 @@
     <modules>
         <module>server</module>
         <module>kleppmanntree</module>
+        <module>supportlib</module>
     </modules>
 
     <properties>
@@ -27,6 +28,7 @@
         <quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
         <quarkus.platform.version>3.11.3</quarkus.platform.version>
         <surefire-plugin.version>3.2.5</surefire-plugin.version>
+        <dhfs.native-libs-dir>${project.parent.build.outputDirectory}/native</dhfs.native-libs-dir>
     </properties>
 
     <repositories>
@@ -89,6 +91,9 @@
                     <systemPropertyVariables>
                         <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
                         <maven.home>${maven.home}</maven.home>
+                        <com.usatiuk.dhfs.supportlib.native-path>
+                            ${dhfs.native-libs-dir}
+                        </com.usatiuk.dhfs.supportlib.native-path>
                     </systemPropertyVariables>
                     <argLine>
                         --add-exports java.base/sun.nio.ch=ALL-UNNAMED
@@ -115,6 +120,7 @@
                         </native.image.path>
                         <java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
                         <buildDirectory>${project.build.directory}</buildDirectory>
+                        <nativeLibsDirectory>${dhfs.native-libs-dir}</nativeLibsDirectory>
                         <junit.jupiter.execution.parallel.enabled>
                             true
                         </junit.jupiter.execution.parallel.enabled>

dhfs-parent/server/pom.xml

@@ -127,5 +127,10 @@
             <artifactId>kleppmanntree</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>
+        <dependency>
+            <groupId>com.usatiuk.dhfs</groupId>
+            <artifactId>supportlib</artifactId>
+            <version>1.0-SNAPSHOT</version>
+        </dependency>
     </dependencies>
 </project>

dhfs-parent/server/src/main/java/com/usatiuk/dhfs/fuse/DhfsFuse.java

@@ -6,6 +6,7 @@ import com.usatiuk.dhfs.files.service.DhfsFileService;
 import com.usatiuk.dhfs.files.service.DirectoryNotEmptyException;
 import com.usatiuk.dhfs.files.service.GetattrRes;
 import com.usatiuk.dhfs.objects.repository.persistence.ObjectPersistentStore;
+import com.usatiuk.dhfs.supportlib.DhfsSupport;
 import com.usatiuk.kleppmanntree.AlreadyExistsException;
 import io.grpc.Status;
 import io.grpc.StatusRuntimeException;
@@ -54,6 +55,7 @@ public class DhfsFuse extends FuseStubFS {
     DhfsFileService fileService;
 
     void init(@Observes @Priority(100000) StartupEvent event) {
+        DhfsSupport.hello();
         if (!enabled) return;
         Paths.get(root).toFile().mkdirs();
         Log.info("Mounting with root " + root);
@@ -142,6 +144,9 @@ public class DhfsFuse extends FuseStubFS {
         } catch (Exception e) {
             Log.error("When getattr " + path, e);
             return -ErrorCodes.EIO();
+        } catch (Throwable e) {
+            Log.error("When getattr " + path, e);
+            return -ErrorCodes.EIO();
         }
         return 0;
     }

dhfs-parent/server/src/test/java/com/usatiuk/dhfs/integration/DhfsFuseIT.java

@@ -35,7 +35,9 @@ public class DhfsFuseIT {
     @BeforeEach
     void setup(TestInfo testInfo) throws IOException, InterruptedException, TimeoutException {
         String buildPath = System.getProperty("buildDirectory");
-        System.out.println("Build path: " + buildPath);
+        String nativeLibsDirectory = System.getProperty("nativeLibsDirectory");
+        Log.info("Build path: " + buildPath);
+        Log.info("Native libs path: " + nativeLibsDirectory);
 
         Network network = Network.newNetwork();
         var image = new ImageFromDockerfile()
@@ -44,6 +46,7 @@ public class DhfsFuseIT {
                                 .from("azul/zulu-openjdk-debian:21-jre-latest")
                                 .run("apt update && apt install -y libfuse2 curl")
                                 .copy("/app", "/app")
+                                .copy("/libs", "/libs")
                                 .cmd("java", "-ea", "-Xmx128M", "--add-exports", "java.base/sun.nio.ch=ALL-UNNAMED",
                                         "--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
                                         "-Ddhfs.objects.peerdiscovery.interval=100",
@@ -54,11 +57,13 @@ public class DhfsFuseIT {
                                         "-Ddhfs.objects.sync.timeout=20",
                                         "-Ddhfs.objects.sync.ping.timeout=20",
                                         "-Ddhfs.objects.reconnect_interval=1s",
+                                        "-Dcom.usatiuk.dhfs.supportlib.native-path=/libs",
                                         "-Dquarkus.log.category.\"com.usatiuk\".level=TRACE",
                                         "-Dquarkus.log.category.\"com.usatiuk.dhfs\".level=TRACE",
                                         "-jar", "/app/quarkus-run.jar")
                                 .build())
-                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"));
+                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"))
+                .withFileFromPath("/libs", Paths.get(nativeLibsDirectory));
         container1 = new GenericContainer<>(image)
                 .withPrivilegedMode(true)
                 .withCreateContainerCmdModifier(cmd -> Objects.requireNonNull(cmd.getHostConfig()).withDevices(Device.parse("/dev/fuse")))

dhfs-parent/server/src/test/java/com/usatiuk/dhfs/integration/DhfsFusex3IT.java

@@ -38,7 +38,9 @@ public class DhfsFusex3IT {
     @BeforeEach
     void setup(TestInfo testInfo) throws IOException, InterruptedException, TimeoutException {
         String buildPath = System.getProperty("buildDirectory");
-        System.out.println("Build path: " + buildPath);
+        String nativeLibsDirectory = System.getProperty("nativeLibsDirectory");
+        Log.info("Build path: " + buildPath);
+        Log.info("Native libs path: " + nativeLibsDirectory);
 
         // TODO: Dedup
         Network network = Network.newNetwork();
@@ -48,6 +50,7 @@ public class DhfsFusex3IT {
                                 .from("azul/zulu-openjdk-debian:21-jre-latest")
                                 .run("apt update && apt install -y libfuse2 curl gcc")
                                 .copy("/app", "/app")
+                                .copy("/libs", "/libs")
                                 .cmd("java", "-ea", "-Xmx128M", "--add-exports", "java.base/sun.nio.ch=ALL-UNNAMED",
                                         "--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
                                         "-Ddhfs.objects.peerdiscovery.interval=100",
@@ -58,11 +61,13 @@ public class DhfsFusex3IT {
                                         "-Ddhfs.objects.sync.timeout=10",
                                         "-Ddhfs.objects.sync.ping.timeout=5",
                                         "-Ddhfs.objects.reconnect_interval=1s",
+                                        "-Dcom.usatiuk.dhfs.supportlib.native-path=/libs",
                                         "-Dquarkus.log.category.\"com.usatiuk\".level=TRACE",
                                         "-Dquarkus.log.category.\"com.usatiuk.dhfs\".level=TRACE",
                                         "-jar", "/app/quarkus-run.jar")
                                 .build())
-                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"));
+                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"))
+                .withFileFromPath("/libs", Paths.get(nativeLibsDirectory));
         container1 = new GenericContainer<>(image)
                 .withPrivilegedMode(true)
                 .withCreateContainerCmdModifier(cmd -> Objects.requireNonNull(cmd.getHostConfig()).withDevices(Device.parse("/dev/fuse")))

dhfs-parent/server/src/test/java/com/usatiuk/dhfs/integration/ResyncIT.java

@@ -1,6 +1,7 @@
 package com.usatiuk.dhfs.integration;
 
 import com.github.dockerjava.api.model.Device;
+import io.quarkus.logging.Log;
 import org.junit.jupiter.api.*;
 import org.slf4j.LoggerFactory;
 import org.testcontainers.containers.GenericContainer;
@@ -32,7 +33,9 @@ public class ResyncIT {
     @BeforeEach
     void setup(TestInfo testInfo) throws IOException, InterruptedException, TimeoutException {
         String buildPath = System.getProperty("buildDirectory");
-        System.out.println("Build path: " + buildPath);
+        String nativeLibsDirectory = System.getProperty("nativeLibsDirectory");
+        Log.info("Build path: " + buildPath);
+        Log.info("Native libs path: " + nativeLibsDirectory);
 
         Network network = Network.newNetwork();
         var image = new ImageFromDockerfile()
@@ -41,6 +44,7 @@ public class ResyncIT {
                                 .from("azul/zulu-openjdk-debian:21-jre-latest")
                                 .run("apt update && apt install -y libfuse2 curl")
                                 .copy("/app", "/app")
+                                .copy("/libs", "/libs")
                                 .cmd("java", "-ea", "-Xmx128M", "--add-exports", "java.base/sun.nio.ch=ALL-UNNAMED",
                                         "--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
                                         "-Ddhfs.objects.peerdiscovery.interval=100",
@@ -51,10 +55,12 @@ public class ResyncIT {
                                         "-Ddhfs.objects.sync.timeout=20",
                                         "-Ddhfs.objects.sync.ping.timeout=20",
                                         "-Ddhfs.objects.reconnect_interval=1s",
+                                        "-Dcom.usatiuk.dhfs.supportlib.native-path=/libs",
                                         "-Dquarkus.log.category.\"com.usatiuk.dhfs\".level=TRACE",
                                         "-jar", "/app/quarkus-run.jar")
                                 .build())
-                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"));
+                .withFileFromPath("/app", Paths.get(buildPath, "quarkus-app"))
+                .withFileFromPath("/libs", Paths.get(nativeLibsDirectory));
         container1 = new GenericContainer<>(image)
                 .withPrivilegedMode(true)
                 .withCreateContainerCmdModifier(cmd -> Objects.requireNonNull(cmd.getHostConfig()).withDevices(Device.parse("/dev/fuse")))

dhfs-parent/server/src/test/resources/application.properties

@@ -5,3 +5,4 @@ dhfs.objects.ref_verification=true
 dhfs.objects.deletion.delay=0
 quarkus.log.category."com.usatiuk.dhfs".level=TRACE
 quarkus.log.category."com.usatiuk.dhfs".min-level=TRACE
+quarkus.class-loading.parent-first-artifacts=com.usatiuk.dhfs:supportlib

dhfs-parent/supportlib/pom.xml

@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>com.usatiuk.dhfs</groupId>
+        <artifactId>parent</artifactId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>supportlib</artifactId>
+
+    <properties>
+        <cmake.download>false</cmake.download>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>exec-maven-plugin</artifactId>
+                <groupId>org.codehaus.mojo</groupId>
+                <version>3.4.1</version>
+                <executions>
+                    <execution>
+                        <id>CMake Configure</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>
+                                ${project.parent.basedir}/../libdhfs_support/builder/cross-build.sh
+                            </executable>
+                            <arguments>
+                                <argument>configure</argument>
+                                <argument>${project.build.outputDirectory}/native-build</argument>
+                                <argument>${dhfs.native-libs-dir}</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>CMake Build</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>
+                                ${project.parent.basedir}/../libdhfs_support/builder/cross-build.sh
+                            </executable>
+                            <arguments>
+                                <argument>build</argument>
+                                <argument>${project.build.outputDirectory}/native-build</argument>
+                                <argument>${dhfs.native-libs-dir}</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>com.googlecode.cmake-maven-project</groupId>
+                <artifactId>cmake-maven-plugin</artifactId>
+                <version>3.30.2-b1</version>
+                <executions>
+                    <execution>
+                        <id>cmake-generate</id>
+                        <goals>
+                            <goal>generate</goal>
+                        </goals>
+                        <configuration>
+                            <sourcePath>
+                                ${project.parent.basedir}/../libdhfs_support
+                            </sourcePath>
+                            <targetPath>
+                                ${project.build.outputDirectory}/native-build-local
+                            </targetPath>
+                            <options>
+                                -DDHFS_LIB_INSTALL=${dhfs.native-libs-dir}
+                            </options>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>cmake-compile</id>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <target>
+                                install
+                            </target>
+                            <projectDirectory>
+                                ${project.build.outputDirectory}/native-build-local
+                            </projectDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

dhfs-parent/supportlib/src/main/java/com/usatiuk/dhfs/supportlib/DhfsSupport.java

@@ -0,0 +1,20 @@
+package com.usatiuk.dhfs.supportlib;
+
+import java.nio.file.Path;
+
+public class DhfsSupport {
+    static private final String LibName = "libdhfs_support";
+
+    static private Path getLibPath() {
+        return Path.of(System.getProperty("com.usatiuk.dhfs.supportlib.native-path"))
+                .resolve(SysUtils.getLibPlatform() + "-" + SysUtils.getLibArch()).resolve(LibName + "." + SysUtils.getLibExtension());
+    }
+
+    static {
+        System.load(getLibPath().toAbsolutePath().toString());
+    }
+
+    public static void hello() {
+        DhfsSupportNative.hello();
+    }
+}

dhfs-parent/supportlib/src/main/java/com/usatiuk/dhfs/supportlib/DhfsSupportNative.java

@@ -0,0 +1,8 @@
+package com.usatiuk.dhfs.supportlib;
+
+
+class DhfsSupportNative {
+
+    public static native void hello();
+
+}

dhfs-parent/supportlib/src/main/java/com/usatiuk/dhfs/supportlib/SysUtils.java

@@ -0,0 +1,42 @@
+package com.usatiuk.dhfs.supportlib;
+
+import org.apache.commons.lang3.SystemUtils;
+
+class SysUtils {
+    static String getLibPlatform() {
+        if (SystemUtils.IS_OS_MAC) {
+            return "Darwin";
+        } else if (SystemUtils.IS_OS_LINUX) {
+            return "Linux";
+        } else {
+            throw new IllegalStateException("Unsupported OS: " + SystemUtils.OS_NAME);
+        }
+    }
+
+    static String getLibExtension() {
+        if (SystemUtils.IS_OS_MAC) {
+            return "dylib";
+        } else if (SystemUtils.IS_OS_LINUX) {
+            return "so";
+        } else {
+            throw new IllegalStateException("Unsupported OS: " + SystemUtils.OS_NAME);
+        }
+    }
+
+    static String getLibArch() {
+        if (SystemUtils.IS_OS_MAC) {
+            return switch (SystemUtils.OS_ARCH) {
+                case "aarch64" -> "arm64";
+                default -> throw new IllegalStateException("Unsupported architecture: " + SystemUtils.OS_ARCH);
+            };
+        } else if (SystemUtils.IS_OS_LINUX) {
+            return switch (SystemUtils.OS_ARCH) {
+                case "aarch64" -> "aarch64";
+                default -> throw new IllegalStateException("Unsupported architecture: " + SystemUtils.OS_ARCH);
+            };
+        } else {
+            throw new IllegalStateException("Unsupported OS: " + SystemUtils.OS_NAME);
+        }
+
+    }
+}

libdhfs_support/.gitignore

@@ -0,0 +1,83 @@
+.DS_Store
+/toolchain
+/cmake-build-debug
+/sysroot
+/mvn-build
+
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser

libdhfs_support/.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

libdhfs_support/.idea/editor.xml

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="BackendCodeEditorSettings">
+    <option name="/Default/Housekeeping/GlobalSettingsUpgraded/IsUpgraded/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppClangFormat/EnableClangFormatSupport/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_BINARY_EXPRESSIONS_CHAIN/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_CALLS_CHAIN/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_EXPRESSION/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_FOR_STMT/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTIPLE_DECLARATION/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_TERNARY/@EntryValue" value="ALIGN_ALL" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/BLANK_LINES_AROUND_CLASS_DEFINITION/@EntryValue" value="1" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/KEEP_BLANK_LINES_IN_CODE/@EntryValue" value="2" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/KEEP_USER_LINEBREAKS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_CASE_FROM_SWITCH/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_COMMENT/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INT_ALIGN_EQ/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SIMPLE_BLOCK_STYLE/@EntryValue" value="DO_NOT_CHANGE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_COMMA_IN_TEMPLATE_ARGS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_COMMA_IN_TEMPLATE_PARAMS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_FOR_SEMICOLON/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_FOR_SEMICOLON/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_UNARY_OPERATOR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_ARRAY_ACCESS_BRACKETS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_CAST_EXPRESSION_PARENTHESES/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_EMPTY_INITIALIZER_BRACES/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_EMPTY_METHOD_PARENTHESES/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_INITIALIZER_BRACES/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPECIAL_ELSE_IF_TREATMENT/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_CAST_EXPRESSION_PARENTHESES/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_AFTER_BINARY_OPSIGN/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_BEFORE_TERNARY_OPSIGNS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/TYPE_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/OTHER_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/CASE_BLOCK_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/BLANK_LINES_AROUND_FUNCTION_DECLARATION/@EntryValue" value="1" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/BLANK_LINES_AROUND_FUNCTION_DEFINITION/@EntryValue" value="1" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/PLACE_WHILE_ON_NEW_LINE/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/PLACE_ELSE_ON_NEW_LINE/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/PLACE_CATCH_ON_NEW_LINE/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/NAMESPACE_INDENTATION/@EntryValue" value="None" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_ARGUMENT/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_EXTENDS_LIST/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_PARAMETER/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_TYPE_ARGUMENT/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ALIGN_MULTILINE_TYPE_PARAMETER/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/BLANK_LINES_AROUND_DECLARATIONS/@EntryValue" value="0" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_ACCESS_SPECIFIERS_FROM_CLASS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_CLASS_MEMBERS_FROM_ACCESS_SPECIFIERS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/LINE_BREAK_AFTER_COLON_IN_MEMBER_INITIALIZER_LISTS/@EntryValue" value="ON_SINGLE_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/MEMBER_INITIALIZER_LIST_STYLE/@EntryValue" value="DO_NOT_CHANGE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_COLON_IN_BITFIELD_DECLARATOR/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_COLON_IN_BITFIELD_DECLARATOR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_EXTENDS_COLON/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_EXTENDS_COLON/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_FOR_COLON/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_FOR_COLON/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_AFTER_PTR_IN_DATA_MEMBERS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_PTR_IN_DATA_MEMBERS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_REF_IN_DATA_MEMBERS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_TEMPLATE_ARGS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BEFORE_TEMPLATE_PARAMS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_BETWEEN_CLOSING_ANGLE_BRACKETS_IN_TEMPLATE_ARGS/@EntryValue" value="true" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_EMPTY_TEMPLATE_PARAMS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_TEMPLATE_ARGS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_TEMPLATE_PARAMS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_DECLARATION_PARENTHESES/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/SPACE_WITHIN_EMPTY_BLOCKS/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_BEFORE_INVOCATION_LPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_AFTER_INVOCATION_LPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_BEFORE_INVOCATION_RPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_BEFORE_DECLARATION_LPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_AFTER_DECLARATION_LPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_BEFORE_DECLARATION_RPAR/@EntryValue" value="false" type="bool" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_ARGUMENTS_STYLE/@EntryValue" value="WRAP_IF_LONG" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/WRAP_PARAMETERS_STYLE/@EntryValue" value="WRAP_IF_LONG" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/BREAK_TEMPLATE_DECLARATION/@EntryValue" value="LINE_BREAK" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/NAMESPACE_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/FREE_BLOCK_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INVOCABLE_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/ANONYMOUS_METHOD_DECLARATION_BRACES/@EntryValue" value="END_OF_LINE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INITIALIZER_BRACES/@EntryValue" value="END_OF_LINE_NO_SPACE" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_STYLE/@EntryValue" value="Space" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/INDENT_SIZE/@EntryValue" value="4" type="int" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/CONTINUOUS_LINE_INDENT/@EntryValue" value="Double" type="string" />
+    <option name="/Default/CodeStyle/CodeFormatting/CppFormatting/TAB_WIDTH/@EntryValue" value="8" type="long" />
+  </component>
+</project>

libdhfs_support/.idea/git_toolbox_blame.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GitToolBoxBlameSettings">
+    <option name="version" value="2" />
+  </component>
+</project>

libdhfs_support/.idea/libdhfs_support.iml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="CMake" type="CPP_MODULE" version="4" />

libdhfs_support/.idea/misc.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakePythonSetting">
+    <option name="pythonIntegrationState" value="YES" />
+  </component>
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+  <component name="CidrRootsConfiguration">
+    <excludeRoots>
+      <file path="$PROJECT_DIR$/mvn-build" />
+    </excludeRoots>
+  </component>
+</project>

libdhfs_support/.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/libdhfs_support.iml" filepath="$PROJECT_DIR$/.idea/libdhfs_support.iml" />
+    </modules>
+  </component>
+</project>

libdhfs_support/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

libdhfs_support/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.24)
+project(libdhfs_support CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+
+find_package(JNI REQUIRED COMPONENTS JVM)
+find_package(Java REQUIRED)
+include(UseJava)
+
+add_jar(DhfsSupportNative
+        "${PROJECT_SOURCE_DIR}/../dhfs-parent/supportlib/src/main/java/com/usatiuk/dhfs/supportlib/DhfsSupportNative.java"
+        GENERATE_NATIVE_HEADERS DhfsSupportNative-native)
+
+add_library(dhfs_support SHARED DhfsSupportNative.cpp)
+target_link_libraries(dhfs_support PRIVATE DhfsSupportNative-native)
+install(TARGETS dhfs_support LIBRARY DESTINATION "${DHFS_LIB_INSTALL}/${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_PROCESSOR}")

libdhfs_support/DhfsSupportNative.cpp

@@ -0,0 +1,9 @@
+#include <cstdio>
+
+#include "com_usatiuk_dhfs_supportlib_DhfsSupportNative.h"
+
+extern "C" {
+void Java_com_usatiuk_dhfs_supportlib_DhfsSupportNative_hello(JNIEnv* env, jclass klass) {
+    printf("Hello, World!\n");
+}
+}

libdhfs_support/builder/Dockerfile

@@ -0,0 +1,3 @@
+FROM rockylinux:8
+
+RUN dnf install -y java-21-openjdk-headless java-21-openjdk-devel cmake gcc gcc-c++

libdhfs_support/builder/cross-build.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+if [[ "$(uname)" == "*Linux*" ]]
+then
+  echo "Already on linux"
+  exit 1
+fi
+
+export SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
+cd "$SCRIPT_DIR"
+
+if [[ -z "${INSIDE_DOCKER_ALREADY}" ]]; then
+  exec "$SCRIPT_DIR"/docker-launch.sh "$@"
+fi
+
+set -euxo pipefail
+
+if [ $# -lt 3 ]
+  then
+    echo "Not enough arguments supplied: (build/configure) (build dir) (output dir)"
+    exit 1
+fi
+
+PROJECT_DIR="$SCRIPT_DIR/.."
+
+CONFIGURE_DIR="$2"
+INSTALL_DIR="$3"
+
+function configure() {
+  cmake -B"$CONFIGURE_DIR" -S"$PROJECT_DIR" -DDHFS_LIB_INSTALL="$INSTALL_DIR"
+}
+
+function build() {
+  cmake --build "$CONFIGURE_DIR" --target install
+}
+
+mkdir -p "$2"
+mkdir -p "$3"
+
+case "$1" in
+  "configure")
+    configure
+    ;;
+  "build")
+    build
+    ;;
+  *)
+    echo "Unknown command"
+    exit 1
+    ;;
+esac

libdhfs_support/builder/docker-launch.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+export SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
+cd "$SCRIPT_DIR"
+
+DOCKER_IMG_FILE=$(mktemp)
+docker build --iidfile "$DOCKER_IMG_FILE" .
+
+ROOT_DIR="$(dirname "$(dirname "$SCRIPT_DIR")")"
+
+docker run --rm -v "$ROOT_DIR:$ROOT_DIR" -e INSIDE_DOCKER_ALREADY=TRUE "$(cat "$DOCKER_IMG_FILE")"  \
+  "$SCRIPT_DIR/cross-build.sh" "$@"