cancel-build-for-unchanged-directory.sh

#!/bin/bash

set -e
set -x

# Usage: 

# ~/repo/ci/git/cancel-build-for-unchanged-directory.sh \ 
#   chromecast \ # CHANGE_DIRECTORY
#   https://devices.lightbox.co.nz/google-cast/version.json \  # REMOTE_PRODUCTION_VERSION_URL
#   true  # SPRINGBOARD_PASSTHROUGH

CHANGE_DIRECTORY="$1" # Required
REMOTE_PRODUCTION_VERSION_URL="$2"  # Optional, if omitted comparison will be against origin/master

# Springboard branch pushes should always pass through in some cases
SPRINGBOARD_PASSTHROUGH="$3"  # Optional, if present and true then springboard pushes will always build
if [[ "$CIRCLE_BRANCH" == "springboard" && "$SPRINGBOARD_PASSTHROUGH" == "true" ]]; then
  echo "Always build $CHANGE_DIRECTORY for springboard, continue job"
  exit 0
fi

# Check if there are changes in the $CHANGE_DIRECTORY folder
# If yes, continue build
# If no, cancel build

# shellcheck source=ci/git/cancel-build-for-unchanged-directory.sh
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# shellcheck source=ci/git/cancel-build-for-unchanged-directory.sh
source "$DIR/export-remote-version.sh" "$REMOTE_PRODUCTION_VERSION_URL"

continue_building_for_changes() {
  CONTINUE_CHANGE_DIRECTORY="$1"
  CURRENT_PROJECT_NAME="$2"

  if git --no-pager diff --name-only "$REMOTE_VERSION...$CIRCLE_SHA1" | grep "^$CONTINUE_CHANGE_DIRECTORY" ; then
    echo "Changes in $CONTINUE_CHANGE_DIRECTORY, continue building $CURRENT_PROJECT_NAME"
    exit 0
  fi
}

continue_building_for_changes "$CHANGE_DIRECTORY" "$CHANGE_DIRECTORY"
continue_building_for_changes ".circleci/" "$CHANGE_DIRECTORY"
continue_building_for_changes "ci/" "$CHANGE_DIRECTORY"

echo "No changes to $CHANGE_DIRECTORY, .circleci/ or ci/, cancelling build"
curl --silent -X POST "$CIRCLE_CI_URL/api/v1.1/project/github/lightboxnz/repo/$CIRCLE_BUILD_NUM/cancel?circle-token=$CIRCLE_TOKEN" \
  | jq .outcome

sleep 10

config.yml

  ... jobs

  # chromecast cc build
  cc-gatekeeper:
    executor: exec-gatekeeper
    steps:
      - checkout
      - run: ~/repo/ci/git/cancel-build-for-unchanged-directory.sh chromecast https://devices.lightbox.co.nz/google-cast/version.json true
  cc-test:
    executor: exec-defaults
    steps:
      - chromecast
      - run: cd ~/repo/chromecast && yarn run coverage
      - run: cd ~/repo && codecov
      - store_artifacts:
          path: ~/repo/chromecast/coverage/lcov-report
          prefix: cc-test-coverage-report
      - store_test_results:
          path: ~/repo/chromecast/reports
  ... further jobs
  
  ... workflows
  
  #   chromecast cc
  build-chromecast:
    jobs:

      - cc-gatekeeper:
          filters:
            branches:
              only:
                - /feature\/dev[0-9]\/.*/
                - /hotfix\/dev[0-9]\/.*/
                - springboard
      - cc-test:
          requires:
            - cc-gatekeeper
      - ... further jobs

export-remote-version.sh

#!/bin/bash

set -e
set -x

# Check if there are changes in the $1 folder
# If yes, continue build
# If no, cancel build

# If a $1 arg was passed, assume it is a URL to a version.json that has a top level sha1 key
REMOTE_VERSION_URL=$1
REMOTE_VERSION='origin/master'
if [[ ! -z "$REMOTE_VERSION_URL" ]]; then
  curl --silent "$REMOTE_VERSION_URL"
  curl --silent "$REMOTE_VERSION_URL" | jq --raw-output .sha1
  REMOTE_VERSION=$(curl --silent "$REMOTE_VERSION_URL" | jq --raw-output .sha1)
fi

export REMOTE_VERSION="$REMOTE_VERSION"