travis.script.sh

#!/bin/bash

#exit script on any error
set -e

# shellcheck disable=SC2034
{
  #Shell Colour constants for use in 'echo -e'
  #e.g.  echo -e "My message ${GREEN}with just this text in green${NC}"
  RED='\033[1;31m'
  GREEN='\033[1;32m'
  YELLOW='\033[1;33m'
  BLUE='\033[1;34m'
  NC='\033[0m' # No Colour 
}

#establish what version we are building
EXTRA_BUILD_ARGS=()
if [ -n "$TRAVIS_TAG" ]; then
    #Tagged commit so use that as our version, e.g. v1.2.3
    PRODUCT_VERSION="${TRAVIS_TAG}"

    # GPG sign the artifacts, publish to nexus then close and release
    # the staging repo to the public nexus repo and on to central
    EXTRA_BUILD_ARGS=(
      "signMavenJavaPublication"
      "publishToSonatype"
      "closeAndReleaseSonatypeStagingRepository"
    )
else
    #No tag so use the branch name as the version, e.g. master-SNAPSHOT
    #None tagged builds are NOT pushed to bintray
    PRODUCT_VERSION="${TRAVIS_BRANCH}-SNAPSHOT"
    EXTRA_BUILD_ARGS=()
fi

#Dump all the travis env vars to the console for debugging
echo -e "TRAVIS_BUILD_NUMBER:  [${GREEN}${TRAVIS_BUILD_NUMBER}${NC}]"
echo -e "TRAVIS_COMMIT:        [${GREEN}${TRAVIS_COMMIT}${NC}]"
echo -e "TRAVIS_BRANCH:        [${GREEN}${TRAVIS_BRANCH}${NC}]"
echo -e "TRAVIS_TAG:           [${GREEN}${TRAVIS_TAG}${NC}]"
echo -e "TRAVIS_PULL_REQUEST:  [${GREEN}${TRAVIS_PULL_REQUEST}${NC}]"
echo -e "TRAVIS_EVENT_TYPE:    [${GREEN}${TRAVIS_EVENT_TYPE}${NC}]"
echo -e "PRODUCT_VERSION:      [${GREEN}${PRODUCT_VERSION}${NC}]"

#Run the build (including running maven install task to generate poms
./gradlew -Pversion="${PRODUCT_VERSION}" clean build "${EXTRA_BUILD_ARGS[@]}"