test.sh

#!/usr/bin/env bash

# AUTHOR= Jessie Frazelle
# It's an copy of the jessfraz dockerfiles test.

set -e

# Exit on error in any of pipe commands
set -o pipefail

UPSTREAM_REPO="https://github.com/dungeonmaster18/awesome-dockerfiles.git"
UPSTREAM_BRANCH="master"

VALIDATE_HEAD="$(git rev-parse --verify HEAD)"

git fetch -q "$UPSTREAM_REPO" "refs/heads/$UPSTREAM_BRANCH"
VALIDATE_UPSTREAM="$(git rev-parse --verify FETCH_HEAD)"

VALIDATE_COMMIT_DIFF="$VALIDATE_UPSTREAM...$VALIDATE_HEAD"

validate_diff() {
  if [ "$VALIDATE_UPSTREAM" != "$VALIDATE_HEAD" ]; then
    git diff "$VALIDATE_COMMIT_DIFF" "$@"
  else
    git diff HEAD~ "$@"
  fi
}

# Get changed dockerfiles after previous commit
IFS=$'\n'
changed_files=( $(validate_diff --name-only -- '*Dockerfile') )
unset IFS

# build the changed dockerfiles
for f in "${changed_files[@]}"; do
  if ! [[ -e "$f" ]]; then
    continue
  fi

  build_dir=$(dirname "$f")
  base="${build_dir%%\/*}"
  tag="${build_dir##*}"
  if [[ -z "$tag" ]]; then
    tag=latest
  fi

  (
    set -x
    docker build -t "$DOCKER_USERNAME/$base:$tag" "$build_dir"
  )

  echo "Successfully built "{$base}:{$tag}" with context "$build_dir""
done