Added dockerfiles form trzeci/emscripten-docker

docker/Dockerfile

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+FROM debian:stretch AS stage_build
+
+# ------------------------------------------------------------------------------
+
+# Supports only 1.38.40+, accpets also '-upstream' variants
+ARG EMSCRIPTEN_VERSION=1.38.43
+ARG EMSDK_CHANGESET=master
+
+# ------------------------------------------------------------------------------
+
+# NOTE: Any change of following variables should be reflected in ./entrypoint file
+ENV EMSDK /emsdk_portable
+ENV EM_DATA ${EMSDK}/.data
+ENV EM_CONFIG ${EMSDK}/.emscripten
+ENV EM_CACHE ${EM_DATA}/cache
+ENV EM_PORTS ${EM_DATA}/ports
+
+# ------------------------------------------------------------------------------
+
+RUN echo "## Start building" \
+    \
+&&	echo "## Update and install packages" \
+    &&	apt-get -qq -y update \
+    &&  apt-get -qq install -y --no-install-recommends \
+            libxml2 \
+            wget \
+            git-core \
+            ca-certificates \
+            build-essential \
+            file \
+            python python-pip \
+            python3 python3-pip \
+    \
+&&  echo "## Done"
+
+RUN  echo "## Get EMSDK" \
+    &&  git clone https://github.com/emscripten-core/emsdk.git ${EMSDK} \
+    &&  cd ${EMSDK} && git reset --hard ${EMSDK_CHANGESET} \
+    \
+    &&  ./emsdk.py update-tags \
+&&  echo "## Done"
+
+RUN  echo "## Install Emscripten" \
+    &&  cd ${EMSDK} \
+    && ./emsdk install ${EMSCRIPTEN_VERSION} \
+    \
+&&  echo "## Done"
+
+# This generates configuration that contains all valid paths according to installed SDK
+RUN cd ${EMSDK} \
+    &&  echo "## Generate standard configuration" \
+    \
+    &&  ./emsdk activate ${EMSCRIPTEN_VERSION} --embedded \
+    &&  ./emsdk construct_env > /dev/null \
+    &&  cat ${EMSDK}/emsdk_set_env.sh \
+    \
+    # remove wrongly created entry with EM_CACHE, variable will be picked up from ENV
+    &&  sed -i -e "/EM_CACHE/d" ${EMSDK}/emsdk_set_env.sh \
+    # add a link to tools like asm2wasm in a system path
+    # asm2wasm (and friends might be places either in ./upstream of ./fastcomp folder, hence detection is needed)
+    &&  printf "export PATH=$(dirname $(find . -name asm2wasm -exec readlink -f {} +)):\$PATH\n" >> ${EMSDK}/emsdk_set_env.sh \
+    \
+&&  echo "## Done"
+
+# Create a structure and make mutable folders accessible for r/w
+RUN cd ${EMSDK} \
+    &&  echo "## Create .data structure" \
+    &&  for mutable_dir in ${EM_DATA} ${EM_PORTS} ${EM_CACHE} ${EMSDK}/zips ${EMSDK}/tmp; do \
+            mkdir -p ${mutable_dir}; \
+            chmod -R 777 ${mutable_dir}; \
+        done \
+        \
+&&  echo "## Done"
+
+# Create an entrypoint that activates Emscripten SDK and helps running this image as non-root user
+COPY entrypoint ${EMSDK}/
+
+# Internal test suite of tools that this image provides
+COPY test_dockerimage.sh ${EMSDK}/
+
+
+# Create symbolic links for critical Emscripten Tools
+# This is important for letting people using Emscripten in Dockerfiles without activation
+# As each Emscripten release is placed to a different folder (i.e. /emsdk_portable/emscripten/tag-1.38.31)
+RUN echo "## Create symbolic links" \
+    &&  . ${EMSDK}/emsdk_set_env.sh \
+    \
+    &&  mkdir -p ${EMSDK}/llvm ${EMSDK}/emscripten ${EMSDK}/binaryen \
+    \
+    &&  ln -s $(dirname $(which node))/..       ${EMSDK}/node/current \
+    &&  ln -s $(dirname $(which clang))/..      ${EMSDK}/llvm/clang \
+    &&  ln -s $(dirname $(which emcc))          ${EMSDK}/emscripten/sdk \
+    \
+    &&  ln -s $(dirname $(which asm2wasm))      ${EMSDK}/binaryen/bin \
+    \
+    &&  echo "## Done"
+
+# Clean up emscripten installation and strip some symbols
+RUN echo "## Aggresive optimization: Remove debug symbols" \
+&&  apt-get -qq -y update && apt-get -qq install -y --no-install-recommends \
+        binutils \
+    && . ${EMSDK}/emsdk_set_env.sh \
+    # Remove debugging symbols from embedded node (extra 7MB)
+    && strip -s `which node` \
+    # Tests consume ~80MB disc space
+    && rm -fr ${EMSDK}/llvm/clang/emscripten/tests \
+    # strip out symbols from clang (~extra 50MB disc space)
+    && find ${EMSDK}/llvm/clang/bin -type f -exec strip -s {} + || true \
+    && find ${EMSDK}/llvm/clang/fastcomp/bin -type f -exec strip -s {} + || true \
+&&  echo "## Done"
+
+# Populate Emscripten SDK cache with libc++, to improve further compilation times.
+RUN echo "## Pre-populate cache" \
+    &&  . ${EMSDK}/emsdk_set_env.sh \
+    \
+    &&  embuilder.py build SYSTEM \
+    \
+    &&  mkdir -p /tmp/emscripten_test \
+    &&  cd /tmp/emscripten_test \
+    \
+        &&  printf '#include <iostream>\nint main(){std::cout << "HELLO FROM DOCKER C++"<<std::endl;return 0;}' > test.cpp \
+        &&  em++ --std=c++11 test.cpp -o test.js -s WASM=0 &&  node test.js \
+        &&  em++ --std=c++11 -g3 test.cpp -o test.js -s WASM=0 &&  node test.js \
+        &&  em++ --std=c++11 test.cpp -o test.js -s WASM=1 &&  node test.js \
+    \
+    &&  cd / \
+    &&  rm -fr /tmp/emscripten_test \
+    \
+    # some files were created, and we need to make sure that those can be accessed by non-root people
+    &&  chmod -R 777 ${EM_DATA} \
+    \
+    # cleanup
+    &&  find ${EMSDK} -name "*.pyc" -exec rm {} \; \
+    \
+    &&  echo "## Done"
+
+# ------------------------------------------------------------------------------
+# -------------------------------- STAGE DEPLOY --------------------------------
+# ------------------------------------------------------------------------------
+
+FROM debian:buster-slim AS stage_deploy
+
+COPY --from=stage_build /emsdk_portable /emsdk_portable
+
+# Fallback in case Emscripten isn't activated.
+# This will let use tools offered by this image inside other Docker images (sub-stages) or with custom / no entrypoint
+ENV EMSDK /emsdk_portable
+ENV EMSCRIPTEN=${EMSDK}/emscripten/sdk
+
+ENV EM_DATA ${EMSDK}/.data
+ENV EM_CONFIG ${EMSDK}/.emscripten
+ENV EM_CACHE ${EM_DATA}/cache
+ENV EM_PORTS ${EM_DATA}/ports
+
+# Fallback in case Emscripten isn't activated
+# Expose Major tools to system PATH, so that emcc, node, asm2wasm etc can be used without activation
+ENV PATH="${EMSDK}:${EMSDK}/emscripten/sdk:${EMSDK}/llvm/clang/bin:${EMSDK}/node/current/bin:${EMSDK}/binaryen/bin:${PATH}"
+
+# Use entrypoint that's coming from emscripten-slim image. It sets all required system paths and variables
+ENTRYPOINT ["/emsdk_portable/entrypoint"]
+
+
+# ------------------------------------------------------------------------------
+# Create a 'standard` 1000:1000 user
+# Thanks to that this image can be executed as non-root user and created files will not require root access level on host machine
+# Please note that this solution even if widely spread (i.e. Node.js uses it) is far from perfect as user 1000:1000 might not exist on
+# host machine, and in this case running any docker image will cause other random problems (mostly due `$HOME` pointing to `/`)
+# This extra user works nicely with entrypoint provided in `/emsdk_portable/entrypoint` as it detects case explained before.
+RUN echo "## Create emscripten user (1000:1000)" \
+    &&  groupadd --gid 1000 emscripten \
+    &&  useradd --uid 1000 --gid emscripten --shell /bin/bash --create-home emscripten \
+    \
+&&  echo "## Done"
+
+# ------------------------------------------------------------------------------
+
+RUN echo "## Update and install packages" \
+# mitigate problem with create symlink to man for base debian image
+    &&  mkdir -p /usr/share/man/man1/ \
+    \
+    &&  apt-get -qq -y update && apt-get -qq install -y --no-install-recommends \
+        libxml2 \
+        ca-certificates \
+        python3 \
+        python3-pip \
+        wget \
+        curl \
+        zip \
+        unzip \
+        git \
+        ssh-client \
+        build-essential \
+        make \
+        ant \
+        libidn11 \
+        cmake \
+        openjdk-11-jre-headless \
+    \
+    # Standard Cleanup on Debian images
+    &&  apt-get -y clean \
+    &&  apt-get -y autoclean \
+    &&  apt-get -y autoremove \
+    &&  rm -rf /var/lib/apt/lists/* \
+    &&  rm -rf /var/cache/debconf/*-old \
+    &&  rm -rf /usr/share/doc/* \
+    &&  rm -rf /usr/share/man/?? \
+    &&  rm -rf /usr/share/man/??_* \
+&&  echo "## Done"
+
+# ------------------------------------------------------------------------------
+
+RUN echo "## Internal Testing of image (activated)" \
+    &&  . ${EMSDK}/emsdk_set_env.sh \
+    &&  ${EMSDK}/test_dockerimage.sh  \
+    \
+&&  echo "## Done"
+
+RUN echo "## Internal Testing of image (not-activated)" \
+    &&  ${EMSDK}/test_dockerimage.sh  \
+    \
+&&  echo "## Done"
+
+# ------------------------------------------------------------------------------
+# Copy this Dockerimage into image, so that it will be possible to recreate it later
+COPY Dockerfile /emsdk_portable/dockerfiles/emscripten-core/emsdk/
+
+LABEL maintainer="kontakt@trzeci.eu" \
+      org.label-schema.name="emscripten" \
+      org.label-schema.description="The official container with Emscripten SDK" \
+      org.label-schema.url="https://emscripten.org" \
+      org.label-schema.vcs-url="https://github.com/emscripten-core/emsdk" \
+      org.label-schema.docker.dockerfile="/docker/Dockerfile"
+
+# ------------------------------------------------------------------------------

docker/README.md

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+### About this Dockerfile
+... to be added
+
+### Usage
+
+Simple usage of this container to compile a hello-world
+```bash
+# create helloworld.cpp
+cat << EOF > helloworld.cpp
+#include <iostream>
+int main() {
+  std::cout << "Hello World!" << std::endl;
+  return 0;
+}
+EOF
+```
+
+```bash
+# compile with docker image
+docker run \
+  --rm \
+  -v $(pwd):$(pwd) \
+  -u $(id -u):$(id -g) \
+  emscripten/emscripten \
+  emcc helloworld.cpp -o helloworld.js
+
+# execute on host machine
+node helloworld.js
+```
+
+Teardown of compilation command:
+
+|part|description|
+|---|---|
+|`docker run`| A standard command to run a command in a container|
+|`--rm`|remove a container after execution (optimization)|
+|`-v $(pwd):$(pwd)`|Mounting current folder from the host system into mirrored path on the container<br>TIP: This helps to investigate possible problem as we preserve exactly the same paths like in host. In such case modern editors (like Sublime, Atom, VS Code) let us to CTRL+Click on a problematic file |
+|`-u $(id -u):$(id -g)`| Run the container as a non-root user with the same UID and GID as local user. Hence all files produced by this are accessible to non-root users|
+|`emscripten/emscripten`|Get the latest tag of this container|
+|`emcc helloworld.cpp -o helloworld.js`|Execute `emcc` command with following arguments inside container, effectively compile our source code|
+
+
+
+### Building Dockerimage
+
+This image requires to specify following build arguments:
+
+| arg | description |
+| --- | --- |
+| `EMSCRIPTEN_VERSION` | One of released version of Emscripten. For example `1.38.45`<br/> Can be used with `-upstream` variant like: `1.38.45-upstream`<br /> Minimal supported version is **1.38.40**|
+
+```bash
+docker build \
+    --build-arg=EMSCRIPTEN_VERSION=1.38.43-upstream \
+    --tag test \
+    .
+```
+
+### Extending
+
+If your project uses packages that this image doesn't provide you might want to:
+* Contribute to this repo: Maybe your dependency is either non-intrusive or could be useful for other people
+* Create custom image that bases on this image
+
+1. create own Dockerfile that holds:
+    ```dockerfile
+    # Point at any base image that you find suitable to extend.
+    FROM emscripten/emscripten:1.38.25
+
+    # Install required tools that are useful for your project i.e. python2
+    RUN apt update && apt install -y python python-pip
+
+    ```
+2. build it
+    ```shell
+    docker build -t extended_emscripten .
+    ```
+
+3. test
+    ```shell
+    docker run --rm extended_emscripten python --version
+    # Python 2.7.16
+    ```

docker/entrypoint

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+#!/bin/sh
+
+# In case when mapped user id by `docker run -u` is not created inside docker image
+# The `$HOME` variable points to `/` - which prevents any tool to write to, as it requires root access
+# In such case we set `$HOME` to `/tmp` as it should r/w for everyone
+
+if [ "$HOME" = "/" ] ; then
+    export HOME=/tmp
+fi
+
+# In case of running as root, use `umask` to reduce problem of file permission on host
+if [ "$(id -g)" = "0" ] && [ "$(id -u)" = "0" ] ;
+then
+    umask 0000
+fi
+
+# Export this image specific Environment variables
+# Those variables are important to use dedicated folder for all cache and predefined config file
+export EM_CONFIG=/emsdk_portable/.emscripten
+export EM_CACHE=/emsdk_portable/.data/cache
+export EM_PORTS=/emsdk_portable/.data/ports
+
+# Activate Emscripten SDK
+. ${EMSDK}/emsdk_set_env.sh
+
+# Evaluate a command that's coming after `docker run` / `docker exec`
+"$@"

docker/test_dockerimage.sh

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+#!/bin/bash
+set -e
+
+which asm2wasm
+which llvm-ar
+which emsdk
+node --version
+npm --version
+python3 --version
+pip3 --version
+em++ --version
+emcc --version
+java -version
+cmake --version
+
+# cleanup after test
+find ${EMSDK} -name "*.pyc" -exec rm {} \;