version: 2.0

references:
  container_config: &container_config
    machine: true
  cache_init: &cache_init
    run:
      name: Initialize Cache
      command: |
        echo "${APT_COMPILER_PACKAGE}_${BUILD_TOOLSET}_${CXX}_${CC}" > /tmp/_build_env_vars
        echo Build env vars used for cache keys:
        cat /tmp/_build_env_vars
  container_setup_pre: &container_setup_pre
    restore_cache:
      keys:
        # Find the most recent cache from any branch
        - v4_container_setup_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}
  container_setup_post: &container_setup_post
    save_cache:
      # Add _aptcache_contents to cache key so that it is re-uploaded each time the cache changes.
      key: v4_container_setup_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}_{{ checksum "/tmp/_aptcache_contents" }}
      paths:
      - /tmp/aptcache
  container_setup: &container_setup
    run:
      name: Setup Environment
      command: |
        if [ -d "/tmp/aptcache" ]; then
          echo Using packages from apt cache
          sudo cp -R /tmp/aptcache/* /var/cache/apt/archives/
        else
          echo No apt cache found
        fi

        sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
        sudo touch /etc/apt/sources.list.d/clang.list
        sudo chmod o+w /etc/apt/sources.list.d/clang.list
        cat > /etc/apt/sources.list.d/clang.list << EOF
        deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main
        deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main
        deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
        deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.8 main
        deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-4.0 main
        deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-4.0 main
        deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-5.0 main
        deb-src http://apt.llvm.org/trusty/ llvm-toolchain-trusty-5.0 main
        EOF
        sudo chmod o-w /etc/apt/sources.list.d/clang.list

        DEBIAN_FRONTEND=noninteractive sudo apt-get update -qq
        DEBIAN_FRONTEND=noninteractive sudo apt-get install -y git ccache $APT_COMPILER_PACKAGE cmake make libcurl4-openssl-dev libboost-filesystem-dev libboost-system-dev libboost-chrono-dev libboost-program-options-dev libboost-thread-dev libcrypto++-dev libssl-dev libfuse-dev python
        # Use /dev/urandom when /dev/random is accessed to use less entropy
        sudo cp -a /dev/urandom /dev/random

        if [ "${BUILD_TOOLSET}" = "clang" ]; then
          # They aren't set automatically unfortunately
          sudo ln -s /usr/bin/$CC /usr/bin/clang
          sudo ln -s /usr/bin/$CXX /usr/bin/clang++

          # Need a c++14 compliant STL for clang
          sudo apt-get install g++-5
          sudo apt-get remove g++-4.8 gcc-4.8
        fi

        # Setup ccache
        sudo ln -s /usr/bin/ccache /usr/local/bin/$CC
        sudo ln -s /usr/bin/ccache /usr/local/bin/$CXX
        sudo mkdir /ccache_data
        sudo chown circleci:circleci /ccache_data
        echo 'export CCACHE_COMPILERCHECK=content' >> $BASH_ENV
        echo 'export CCACHE_COMPRESS=1' >> $BASH_ENV
        echo 'export CCACHE_DIR=/ccache_data' >> $BASH_ENV
        echo 'export CCACHE_SLOPPINESS=include_file_mtime' >> $BASH_ENV

        sudo mkdir -p /tmp/aptcache
        sudo cp -R /var/cache/apt/archives/* /tmp/aptcache/
        ls /tmp/aptcache > /tmp/_aptcache_contents

        echo
        echo System Info:
        cat /etc/issue
        uname -a
        cmake --version
        /usr/local/bin/$CC --version
        /usr/local/bin/$CXX --version
  upgrade_boost_pre: &upgrade_boost_pre
    restore_cache:
      keys:
        # Find the most recent cache from any branch
        - v2_upgrade_boost_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}
  upgrade_boost_post: &upgrade_boost_post
    save_cache:
      key: v2_upgrade_boost_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}
      paths:
      - /tmp/boost_1_56_0
  upgrade_boost: &upgrade_boost
    run:
      name: Upgrade Boost
      command: |
        # Detect number of CPU cores
        export NUMCORES=`nproc`
        echo Using $NUMCORES cores
        # Download and prepare boost (only if not already present from cache)
        if [ ! -d "/tmp/boost_1_56_0" ]; then
          echo "Didn't find boost in cache. Downloading and building."
          wget -O /tmp/boost.tar.bz2 https://sourceforge.net/projects/boost/files/boost/1.56.0/boost_1_56_0.tar.bz2/download
          if [ $(sha512sum /tmp/boost.tar.bz2 | awk '{print $1;}') == "1ce9871c3a2519682538a5f1331938b948123432d99aea0ce026958cbebd25d84019a3a28c452724b9693df98a8d1264bb2d93d2fee508453f8b42836e67481e" ]; then
            echo Correct sha512sum
          else
            echo Wrong sha512sum
            sha512sum boost.tar.bz2
            exit 1
          fi
          echo Extracting...
          tar -xf /tmp/boost.tar.bz2 -C /tmp
          rm -rf boost.tar.bz2
          cd /tmp/boost_1_56_0
          ./bootstrap.sh --with-toolset=${BUILD_TOOLSET} --with-libraries=filesystem,thread,chrono,program_options
          cd ..
        else
          echo Found boost in cache. Use cache and build.
        fi
        # Compile and install boost (if cached, this should be fast)
        cd /tmp/boost_1_56_0
        sudo ./b2 toolset=${BUILD_TOOLSET} link=static cxxflags=-fPIC -d0 -j$NUMCORES install
  build_pre: &build_pre
    restore_cache:
      keys:
        # Find most recent cache from any revision on the same branch (cache keys are prefix matched)
        # CIRCLE_PR_NUMBER is only set if this is a pull request.
        - v3_build_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}_{{ .Branch }}_{{ .Environment.CIRCLE_PR_NUMBER }}
        # Fallback to less specific caches if the one above wasn't found
        - v3_build_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}_{{ .Branch }}
        - v3_build_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}
  build_post: &build_post
    save_cache:
      key: v3_build_cache_{{ checksum "/tmp/_build_env_vars" }}_{{ arch }}_{{ .Branch }}_{{ .Environment.CIRCLE_PR_NUMBER }}_{{ .Revision }}
      paths:
      - /ccache_data
  build: &build
    run:
      name: Build
      command: |
        export NUMCORES=`nproc` && if [ ! -n "$NUMCORES" ]; then export NUMCORES=`sysctl -n hw.ncpu`; fi
        echo Using $NUMCORES cores
        # Use ccache
        export CXX=/usr/local/bin/$CXX
        export CC=/usr/local/bin/$CC
        ccache --max-size=512M
        ccache --show-stats

        # Build
        mkdir cmake
        cd cmake
        cmake .. -DBUILD_TESTING=on -DCMAKE_BUILD_TYPE=Debug
        make -j$NUMCORES

        ccache --show-stats
  test: &test
    run:
      name: Test
      command: |
        cd cmake
        ./test/gitversion/gitversion-test
        ./test/cpp-utils/cpp-utils-test
        ./test/fspp/fspp-test
        ./test/parallelaccessstore/parallelaccessstore-test
        ./test/blockstore/blockstore-test
        ./test/blobstore/blobstore-test
        ./test/cryfs/cryfs-test
        ./test/cryfs-cli/cryfs-cli-test
  job_definition: &job_definition
    <<: *container_config
    steps:
    - <<: *cache_init
    - <<: *container_setup_pre
    - <<: *container_setup
    - <<: *container_setup_post
    - <<: *upgrade_boost_pre
    - <<: *upgrade_boost
    - <<: *upgrade_boost_post
    - checkout
    - <<: *build_pre
    - <<: *build
    - <<: *build_post
    - <<: *test
  enable_for_tags: &enable_for_tags
    filters:
      tags:
        only: /.*/

jobs:
  gcc_4_8:
    <<: *job_definition
    environment:
      CC: gcc-4.8
      CXX: g++-4.8
      BUILD_TOOLSET: gcc
      APT_COMPILER_PACKAGE: "g++-4.8"
  gcc_5:
    <<: *job_definition
    environment:
      CC: gcc-5
      CXX: g++-5
      BUILD_TOOLSET: gcc
      APT_COMPILER_PACKAGE: "g++-5"
  gcc_6:
    <<: *job_definition
    environment:
      CC: gcc-6
      CXX: g++-6
      BUILD_TOOLSET: gcc
      APT_COMPILER_PACKAGE: "g++-6"
  gcc_7:
    <<: *job_definition
    environment:
      CC: gcc-7
      CXX: g++-7
      BUILD_TOOLSET: gcc
      APT_COMPILER_PACKAGE: "g++-7"
  clang_3_7:
    <<: *job_definition
    environment:
      CC: clang-3.7
      CXX: clang++-3.7
      BUILD_TOOLSET: clang
      APT_COMPILER_PACKAGE: clang-3.7
  clang_3_8:
    <<: *job_definition
    environment:
      CC: clang-3.8
      CXX: clang++-3.8
      BUILD_TOOLSET: clang
      APT_COMPILER_PACKAGE: clang-3.8
  clang_4_0:
    <<: *job_definition
    environment:
      CC: clang-4.0
      CXX: clang++-4.0
      BUILD_TOOLSET: clang
      APT_COMPILER_PACKAGE: clang-4.0
  clang_5_0:
    <<: *job_definition
    environment:
      CC: clang-5.0
      CXX: clang++-5.0
      BUILD_TOOLSET: clang
      APT_COMPILER_PACKAGE: clang-5.0

workflows:
  version: 2

  build_and_test:
    jobs:
    - gcc_4_8:
        <<: *enable_for_tags
    - gcc_5:
        <<: *enable_for_tags
    - gcc_6:
        <<: *enable_for_tags
    - gcc_7:
        <<: *enable_for_tags
    - clang_3_7:
        <<: *enable_for_tags
    - clang_3_8:
        <<: *enable_for_tags
    - clang_4_0:
        <<: *enable_for_tags
    - clang_5_0:
        <<: *enable_for_tags