CI-agnostic Env Variables

ci-env.sh

#!/bin/bash -e

## Maps env variables from different CIs to common names. Useful for changing between CIs.
##
## eval "$(curl -sSL https://gist.githubusercontent.com/karimsa/737c7220348bfa0a3d4e4689bcc34491/raw/ci-env.sh)"
##
## Licensed under MIT license.
## Copyright (C) 2019-present Karim Alibhai. All rights reserved.

if test "$CI" != "true"; then
  echo "Not a CI."
  exit 1
fi

###########################################
## $BRANCH - Current branch mapping      ##
###########################################

export BRANCH="$BRANCH"

if ! test -z "$TRAVIS_BRANCH"; then ## Travis CI
  export BRANCH="$TRAVIS_BRANCH";
elif ! test -z "$BRANCH_NAME"; then ## Semaphore CI
  export BRANCH="$BRANCH_NAME";
elif which git &>/dev/null; then ## Anything else?
  export BRANCH="$(git rev-parse --abbrev-ref HEAD)"
fi

#################################################
## $BUILD_ID - Unique identifier for the build ##
#################################################

export BUILD_ID="$BUILD_ID"

if ! test -z "$TRAVIS_BUILD_ID"; then
  export BUILD_ID="$TRAVIS_BUILD_ID"
elif ! test -z "$SEMAPHORE_BUILD_NUMBER"; then
  export BUILD_ID="$SEMAPHORE_BUILD_NUMBER"
fi