Update Dockerfile to build Rust core

Dockerfile

@@ -1,25 +1,36 @@
-FROM ubuntu:17.04
+FROM ubuntu:18.04
 
-RUN dpkg --add-architecture i386 && \
-    apt-get update -y && \
-    apt-get install -y software-properties-common && \
-    apt-get update -y && \
-    apt-get install -y libc6:i386=2.24-9ubuntu2.2 libncurses5:i386=6.0+20160625-1ubuntu1 libstdc++6:i386=6.3.0-12ubuntu2 lib32z1=1:1.2.11.dfsg-0ubuntu1 wget openjdk-8-jdk=8u131-b11-2ubuntu1.17.04.3 git unzip && \
-    rm -rf /var/lib/apt/lists/* && \
-    apt-get autoremove -y && \
-    apt-get clean
+# Install Android Studio requirements
+# See https://developer.android.com/studio/install#linux
+RUN apt-get update -y \
+&& apt-get install -y --no-install-recommends \
+wget \
+curl \
+unzip \
+openjdk-11-jre \
+file \
+build-essential \
+&& rm -rf /var/lib/apt/lists/*
 
-ENV ANDROID_SDK_FILENAME android-sdk_r24.4.1-linux.tgz
-ENV ANDROID_SDK_URL https://dl.google.com/android/${ANDROID_SDK_FILENAME}
-ENV ANDROID_API_LEVELS android-27
-ENV ANDROID_BUILD_TOOLS_VERSION 27.0.1
-ENV ANDROID_HOME /usr/local/android-sdk-linux
-ENV PATH ${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools
-RUN cd /usr/local/ && \
-    wget -q ${ANDROID_SDK_URL} && \
-    tar -xzf ${ANDROID_SDK_FILENAME} && \
-    rm ${ANDROID_SDK_FILENAME} 
-RUN echo y | android update sdk --no-ui -a --filter ${ANDROID_API_LEVELS}
-RUN echo y | android update sdk --no-ui -a --filter extra-android-m2repository,extra-android-support,extra-google-google_play_services,extra-google-m2repository
-RUN echo y | android update sdk --no-ui -a --filter tools,platform-tools,build-tools-${ANDROID_BUILD_TOOLS_VERSION}
-RUN rm -rf ${ANDROID_HOME}/tools && unzip ${ANDROID_HOME}/temp/*.zip -d ${ANDROID_HOME}
+ENV ANDROID_HOME /android-sdk
+
+WORKDIR /android-sdk
+RUN wget -q https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip && \
+  unzip commandlinetools-linux-6200805_latest.zip && \
+  rm commandlinetools-linux-6200805_latest.zip
+
+RUN yes | ${ANDROID_HOME}/tools/bin/sdkmanager --sdk_root=${ANDROID_HOME} --licenses
+
+ENV PATH ${PATH}:/android-sdk/tools/bin
+
+# Install NDK manually. Other SDK parts are installed automatically by gradle.
+RUN sdkmanager --sdk_root=${ANDROID_HOME} ndk-bundle
+
+ENV PATH ${PATH}:/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/:/android-sdk/ndk-bundle/
+
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain none
+ENV PATH ${PATH}:/root/.cargo/bin
+RUN rustup default nightly-2019-11-06 \
+&& rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android
+
+COPY docker/cargo-config /root/.cargo/config

README.md

@@ -12,7 +12,7 @@ For the core library and other common info, please refer to the
 <img alt="Screenshot Chat List" src="docs/images/2019-01-chatlist.png" width="298" /> <img alt="Screenshot Chat View" src="docs/images/2019-01-chat.png" width="298" />
 
 
-# Build
+# Check Out Repository
 
 When checking out _deltachat-android_, make sure also to check out the
 subproject _deltachat-core-rust_:
@@ -22,8 +22,44 @@ subproject _deltachat-core-rust_:
   or later by `git submodule update --init --recursive`. If you do this in your
   home directory, this results in the folder `~/deltachat-android` which is just fine.
 
-Then, open `ndk-make.sh` in an editor and follow the instructions
-to set up a rust build environment.  This is needed only once.
+# Build Using Dockerfile
+
+If you only want to build an APK, the easiest way is to use
+provided `Dockerfile` with [Docker](https://www.docker.com/) or
+[Podman](https://podman.io/). Podman is a drop-in replacement for Docker
+that does not require root privileges.  It is used in the following
+example.
+
+First, build the image `deltachat-android` by running
+```
+podman build . -t deltachat-android
+```
+
+Then, run the image:
+```
+podman run -it -v $(pwd):/home/app -w /home/app localhost/deltachat-android
+```
+
+Within the container, build the native library first:
+```
+root@6012dcb974fe:/home/app# ./ndk-make.sh
+```
+
+Then, [build an APK](https://developer.android.com/studio/build/building-cmdline):
+```
+root@6012dcb974fe:/home/app# ./gradlew assembleDebug
+```
+
+If you don't want to use Docker or Podman, proceed to the next section.
+
+# Install Build Environment
+
+To setup build environment manually, you can read the `Dockerfile`
+and mimic what it does.
+
+First, you need to setup Android SDK and Android NDK.  Then, open
+`ndk-make.sh` in an editor and follow the instructions to set up a rust
+build environment.  This is needed only once.
 
 After that, call `./ndk-make.sh` in the root directory to build core-rust.
 Afterwards run the project in Android Studio. The project requires API 25.

docker/cargo-config

@@ -0,0 +1,8 @@
+[target.armv7-linux-androideabi]
+linker = "/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi16-clang"
+[target.aarch64-linux-android]
+linker = "/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android21-clang"
+[target.i686-linux-android]
+linker = "/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/i686-linux-android16-clang"
+[target.x86_64-linux-android]
+linker = "/android-sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android21-clang"