Test Dockerfiles and Travis CI on downstream repos

.travis.yml

@@ -0,0 +1,19 @@
+sudo: required
+
+language: sh
+
+services:
+  - docker
+
+before_install:
+  - export DOCKER_REPO=nlknguyen/shellcheck
+  - export TAG=$(if [ "$TRAVIS_BRANCH" == "master" ]; then echo "latest"; else echo $TRAVIS_BRANCH ; fi)  
+
+script:
+  - docker build -t builder -f Dockerfile_builder .
+  - docker run --rm -it -v $(pwd):/mnt builder
+  - docker build -t $DOCKER_REPO:$TAG .
+
+after_success:
+  - docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
+  - docker push $DOCKER_REPO:$TAG

Dockerfile

@@ -1,22 +1,11 @@
-FROM ubuntu:xenial
-MAINTAINER https://github.com/koalaman/shellcheck
+FROM alpine:latest
 
-RUN apt-get update && apt-get install --no-install-recommends -y \
-    cabal-install \
-    ghc \
- && rm -rf /var/lib/apt/lists/*
+MAINTAINER Nikyle Nguyen <NLKNguyen@MSN.com>
 
-COPY ShellCheck.cabal /src/ShellCheck.cabal
+COPY package/bin/shellcheck /usr/local/bin/
+COPY package/lib/           /usr/local/lib/
 
-WORKDIR /src
+RUN ldconfig /usr/local/lib
 
-ENV PATH="/root/.cabal/bin:$PATH"
-
-RUN cabal update \
- && cabal install --only-dependencies
-
-COPY . /src
-
-RUN cabal install /src
-
-CMD ["shellcheck", "-"]
+WORKDIR /mnt
+ENTRYPOINT ["shellcheck"]

Dockerfile_builder

@@ -0,0 +1,53 @@
+FROM mitchty/alpine-ghc:latest
+
+MAINTAINER Nikyle Nguyen <NLKNguyen@MSN.com>
+
+RUN apk add --no-cache build-base
+
+RUN mkdir -p /usr/src/shellcheck
+WORKDIR /usr/src/shellcheck
+
+# # ------------------------------------------------------------
+# # Build & Test
+# # ------------------------------------------------------------
+
+# Obtain the dependencies first, which are less likely to change, in order to reduce
+# subsequent build time by leveraging image cache. This benefits developers when they
+# build their code with this image locally. In case of Travis CI, this doesn't help
+# reduce building time because Travis CI doesn't use cache.
+COPY ShellCheck.cabal .
+RUN cabal update && cabal install --only-dependencies
+
+# Copy the rest of the source files, including ShellCheck.cabal again but doesn't matter
+COPY . .
+
+# Build
+RUN cabal install
+
+# TODO: run tests
+
+# # ------------------------------------------------------------
+# # Set PATH
+# # ------------------------------------------------------------
+
+# Add runtime path to easily reach the executable file. This only exists during build.
+ENV PATH "/root/.cabal/bin:$PATH"
+
+# Make it permanent for someone who login to the container of this image
+RUN echo "export PATH=${PATH}" >>  /etc/profile
+
+# # ------------------------------------------------------------
+# # Extract Binaries
+# # ------------------------------------------------------------
+
+# Get shellcheck binary
+RUN mkdir -p /package/bin/
+RUN cp $(which shellcheck) /package/bin/
+
+# Get shared libraries using magic
+RUN mkdir -p /package/lib/
+RUN ldd $(which shellcheck) | grep "=> /" | awk '{print $3}' | xargs -I '{}' cp -v '{}' /package/lib/
+
+
+# Copy shellcheck package out to mounted directory
+CMD ["cp", "-avr", "/package", "/mnt/"]