CircleCI elixir build example

README.md

This runs a build for a small elixir (phoenix) project in about 40 seconds by caching as much of the compiled files as possible.

We've been using this for months in multiple projects without any issues. Please ping be if there is any issues with this script and I'll update it.

It should be generic enough to work on any elixir app using mix.

If you have a elixir_buildpack.config, then enable that section in the build script to keep versions in sync!

circle.yml

dependencies:
  pre:
    - script/ci/prepare.sh
  cache_directories:
    - ~/dependencies
    - ~/.mix
    - _build
    - deps

test:
  override:
    - script/ci/tests.sh

script-ci-prepare.sh

#!/bin/bash

set -e

export ERLANG_VERSION="17.5"
export ELIXIR_VERSION="v1.0.5"

# If you have a elixir_buildpack.config, do this instead:
#export ERLANG_VERSION=$(cat elixir_buildpack.config | grep erlang_version | tr "=" " " | awk '{ print $2 }')
#export ELIXIR_VERSION=v$(cat elixir_buildpack.config | grep elixir_version | tr "=" " " | awk '{ print $2 }')

export INSTALL_PATH="$HOME/dependencies"

export ERLANG_PATH="$INSTALL_PATH/otp_src_$ERLANG_VERSION"
export ELIXIR_PATH="$INSTALL_PATH/elixir_$ELIXIR_VERSION"

mkdir -p $INSTALL_PATH
cd $INSTALL_PATH

# Install erlang
if [ ! -e $ERLANG_PATH/bin/erl ]; then
  curl -O http://www.erlang.org/download/otp_src_$ERLANG_VERSION.tar.gz
  tar xzf otp_src_$ERLANG_VERSION.tar.gz
  cd $ERLANG_PATH
  ./configure --enable-smp-support \
              --enable-m64-build \
              --disable-native-libs \
              --disable-sctp \
              --enable-threads \
              --enable-kernel-poll \
              --disable-hipe \
              --without-javac
  make

  # Symlink to make it easier to setup PATH to run tests
  ln -sf $ERLANG_PATH $INSTALL_PATH/erlang
fi

# Install elixir
export PATH="$ERLANG_PATH/bin:$PATH"

if [ ! -e $ELIXIR_PATH/bin/elixir ]; then
  git clone https://github.com/elixir-lang/elixir $ELIXIR_PATH
  cd $ELIXIR_PATH
  git checkout $ELIXIR_VERSION
  make

  # Symlink to make it easier to setup PATH to run tests
  ln -sf $ELIXIR_PATH $INSTALL_PATH/elixir
fi

export PATH="$ERLANG_PATH/bin:$ELIXIR_PATH/bin:$PATH"

# Install package tools
if [ ! -e $HOME/.mix/rebar ]; then
  yes Y | LC_ALL=en_GB.UTF-8 mix local.hex
  yes Y | LC_ALL=en_GB.UTF-8 mix local.rebar
fi

# Fetch and compile dependencies and application code (and include testing tools)
export MIX_ENV="test"
cd $HOME/$CIRCLE_PROJECT_REPONAME
mix do deps.get, deps.compile, compile

script-ci-test.sh

#!/bin/bash

export MIX_ENV="test"
export PATH="$HOME/dependencies/erlang/bin:$HOME/dependencies/elixir/bin:$PATH"

mix test