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Update README
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‎README.md‎

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@@ -46,81 +46,61 @@ The build process produces these files:
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|-------|-----------------|-------------------|---------------|-------------------|-------------------------------------------------|
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| JRI | `jri-ev3.zip` | Minimal runtime | Brick | Java developer | Running Java programs on ev3dev. |
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| JDK | `jdk-ev3.zip` | Full JDK | Brick | ev3dev power user | Compiling Java programs directly on the brick. |
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| JMODs | `jmods-ev3.zip` | Runtime precursor | Developer PC | both | Creating runtime images with more Java modules. |
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| JMODs | `jmods-ev3.zip` | Runtime modules | Developer PC | both | Creating custom JRIs. |
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_JRI stands for "Java Runtime Image". The term itself is not specific to this project,
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it is equivalent to [Modular Run-Time Image](https://openjdk.java.net/jeps/220).
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To see which modules are included in our case, take a look at the jlink commandline in `scripts/zip.sh`._
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To see which modules are included in our case, take a look at the `JRI_MODULES` variable in `scripts/config.sh`._
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## Building
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## Building locally
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0. Clone this repository.
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1. Install [Docker](https://docs.docker.com/engine/installation/) for your operating system.
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2. Build the base cross-compilation image:
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```sh
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sudo docker build -t ev3dev-lang-java:jdk-stretch -f system/stretch/Dockerfile.armel system
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2. Follow this script:
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```bash
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# define parameters
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TARGET_WORKSPACE="$(pwd)/build" # 10 GB of free space should be sufficient, probably less
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TARGET_DEBIAN_VERSION="stretch" # stretch or buster
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TARGET_OPENJDK_VERSION="11" # 9, 10 - retired, may not be working
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# 11, 12, 13 - most likely working
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# loom or tip - experimental, may be broken
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# clone repository
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git clone https://github.com/ev3dev-lang-java/openjdk-ev3.git
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cd openjdk-ev3
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# prepare working directory
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mkdir -p "$TARGET_WORKSPACE"
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chmod -R 777 "$TARGET_WORKSPACE" # docker may not share UID with the current user
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# build base system container
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docker build --build-arg DEBIAN_RELEASE="$TARGET_DEBIAN_VERSION" \
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--build-arg ARCH="armel" \
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--tag "ev3dev-lang-java:jdk-cross-$TARGET_DEBIAN_VERSION" \
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--file ./system/Dockerfile.cross \
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./system
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# on top of that, create a build scripts container
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docker build --build-arg commit="$(git rev-parse HEAD)" \
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--build-arg extra="Manual build by $(whoami)" \
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--build-arg DEBIAN_RELEASE="$TARGET_DEBIAN_VERSION" \
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--build-arg BUILD_TYPE="cross" \
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--tag "ev3dev-lang-java:jdk-cross-build" \
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./scripts
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# now run the build
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docker run --rm \
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--interactive \
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--tty \
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--volume "$TARGET_WORKSPACE:/build" \
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--env JDKVER="$TARGET_OPENJDK_VERSION" \
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--env JDKVM="client" \
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--env JDKPLATFORM="ev3" \
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--env JDKDEBUG="release" \
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--env AUTOBUILD="1" \
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ev3dev-lang-java:jdk-cross-build
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# finally, make workspace accessible for all users (i.e. current one too) and list files in its root
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chmod -R 777 "$TARGET_WORKSPACE"
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# and list the output directory (now it should contain three *-ev3.tar.gz files)
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ls "$TARGET_WORKSPACE"
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```
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To use Debian Buster, replace occurences of `stretch` with `buster`.
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3. Build the image with OpenJDK cross-compilation scripts:
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```sh
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sudo docker build -t ev3dev-lang-java:jdk-build --build-arg DEBIAN_RELEASE=stretch -f scripts/Dockerfile scripts
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```
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Again, you can replace `stretch` with `buster`.
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Next steps depend on whether you want to navigate the build yourself, or if you want the build to run automatically.
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### Semi-manual build
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4. Run the newly prepared container. You have to mount a host directory to the the `/build` directory in the container,
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otherwise the build would get discarded. The final build needs at least 6.5 GB of free space (in the build directory).
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```
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sudo docker run --rm -it -v $BUILD_DIRECTORY:/build ev3dev-lang-java:jdk-build
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```
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Please change the `$BUILD_DIRECTORY` to a valid path.
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5. Select the OpenJDK version and VM you want to cross-compile (select only one for each variable):
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```
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export JDKVER=9 # OpenJDK 9
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export JDKVER=10 # OpenJDK 10
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export JDKVER=11 # OpenJDK 11
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export JDKVER=12 # OpenJDK 12
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export JDKVER=13 # OpenJDK 13
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export JDKVM=zero # Use Zero interpreter
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export JDKVM=client # Use full ARM32 JIT
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export JDKVM=minimal # Use minimal ARM32 JIT (https://openjdk.java.net/jeps/148)
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export JDKPLATFORM=ev3 # Use EV3 build flags
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```
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6. Before we can start the build process, Boot JDK must be downloaded:
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```
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./prepare.sh
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```
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7. Now we can download the OpenJDK sources:
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```
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./fetch.sh
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```
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8. The OpenJDK source tree should be ready. Now you can start the cross-build itself:
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```
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./build.sh
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```
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9. Create the zipped images:
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```
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./zip.sh
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```
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10. If the build was successful, JDK packages were created in `/build/jri-ev3.tar.gz`, `/build/jdk-ev3.tar.gz` and `/build/jmods.tar.gz`.
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If you have mounted `/build`, you can access the files from the host.
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### Automatic build
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4. Run the newly prepared container. You have to mount a host directory to the the `/build` directory in the container,
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otherwise the build would get discarded. The final build needs at least 6.5 GB of free space (in the build directory).
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```
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sudo docker run --rm -v $BUILD_DIRECTORY:/build -e JDKVER='X' -e JDKVM='Y' -e JDKPLATFORM='Z' -e AUTOBUILD='yes' ev3dev-lang-java:jdk-build
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```
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For values of `X`, `Y` and `Z` see above. Please change the `$BUILD_DIRECTORY` to a valid path.
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5. If the build was successful, JDK packages were created in `$BUILD_DIRECTORY/jri-ev3.tar.gz`, `$BUILD_DIRECTORY/jdk-ev3.tar.gz` and `$BUILD_DIRECTORY/jmods.tar.gz`.
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## LeJOS support
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LeJOS is not supported. To create a build, it is needed to build Java dependencies
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for the old LEGO-provided rootfs. Also, the rootfs build compiler is needed for building OpenJDK itself.
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[linux-devkit](https://github.com/mindboards/ev3sources/tree/master/extra/linux-devkit) + CodeSourcery GCC could be used for the cross-compilation.

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