Git Buildstep

git-buildstep

#!/usr/bin/env bash
set -e

banner()  { echo "-----> $*"; }
warn()    { echo ">>>>>> $*"; }

DOCKER="${DOCKER:-docker}"
REF=HEAD

while [[ $# -gt 0 ]] ; do
  token="$1"
  shift

  case "$token" in
  --ref|-r)
    REF="$1"
    shift
    ;;
  --tag|-t)
    TAG="$1"
    shift
    ;;
  --dry-run|-n)
    DRY_RUN=1
    ;;
  --verbose|-v)
    VERBOSE=1
    ;;
  --help|--usage)
    usage
    exit 0
    ;;
  *)
    NAME="$token"
    ;;
  esac
done

if [ -z "$NAME" ] ; then
  warn "An app name was not given."
  echo
  exit 1
fi

ENVS="-e CURL_TIMEOUT=120"
if [ -n "$http_proxy" ] ; then
  ENVS="$ENVS -e http_proxy=$http_proxy"
fi
if [ -n "$https_proxy" ] ; then
  ENVS="$ENVS -e https_proxy=$https_proxy"
fi

REF="$(git show --format='format:%h' --quiet $REF)"

if [ -z "$TAG" ] ; then
  TAG="$REF"
fi

SUBJECT="$(git show --format='format:%s' --quiet $REF)"

# Run the builder script and attach to view output
if [[ -z "$TAG" ]]; then
  IMAGE=$NAME
else
  IMAGE=$NAME:$TAG
fi

banner "Creating docker image \"$IMAGE\" from app at $REF ($SUBJECT)"

# Place the app inside the container
banner "Preparing $NAME in an image"
ID=$(git archive $REF | \
  $DOCKER run -i -a stdin $ENVS progrium/buildstep \
  /bin/bash -c "mkdir -p /app && tar -xC /app")
trap "echo \"Terminating docker container running app prep: $ID\"; $DOCKER kill $ID" SIGINT SIGHUP
test $($DOCKER wait $ID) -eq 0
banner "Prepared $NAME image committed as $IMAGE"
COMMIT_ID=$($DOCKER commit $ID $IMAGE)

banner "Running builder on prepared image for $NAME"
ID=$($DOCKER run -d $ENVS $IMAGE /build/builder)
trap "echo \"Terminating container running builder: $ID\"; $DOCKER kill $ID >/dev/null; echo \"Removing intermediate image: $COMMIT_ID\"; $DOCKER rmi $COMMIT_ID" SIGINT SIGHUP
$DOCKER attach --sig-proxy=false $ID
test $($DOCKER wait $ID) -eq 0
banner "Final $NAME image committed as $IMAGE"
COMMIT_ID=$($DOCKER commit $ID $IMAGE)

banner "Docker image \"$NAME:$TAG\" ($COMMIT_ID) build finished."