setup

#!/bin/bash

# original authors: James Hunt <james@niftylogic.com>
#                   Dennis Bell <dennis.j.bell@gmail.com>
# created:          2016-03-10
# maintainer:       Benjamin Gandon (Gstack)

src="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
pipeline_types="$(cd ${src} && find . -name 'pipeline.yml' | sed -e "s|^\./||;s|/pipeline.yml$||")"

usage() {
    local message=$1
    local exit_status=$2
    cat <<EOF
${message:-"Setup pipeline template for the desired type of pipeline."}

Usage: $(basename "${BASH_SOURCE[0]}") <type> [/repo/to/setup]

where <type> is one of:
$(sed -e "s/^/  - /" <<< "${pipeline_types}")

EOF
    exit ${exit_status:-0}
}

set -e
case "${1}" in
    (-h|--help|help)
        usage
        ;;
esac

export template=$1
export target=${2:-$(pwd)}

apply_shell_expansion() {
    declare file="$1"
    declare data=$(< "${file}")
    declare delimiter="__apply_shell_expansion_delimiter__"
    declare command="cat <<${delimiter}"$'\n'"${data}"$'\n'"${delimiter}"
    eval "${command}"
}

initial_settings_yml() {
    local settings_yml="${target}/ci/settings.yml"
    if [[ -f ${src}/${template}/helpers/initial_settings.yml ]]; then
        export team=${team:-"main"}
        export name=$(basename "${target}")
        export fly_target=${fly_target:-$(fly targets | head -n1 | tail -n1 | awk '{print $1}')}
        export fly_target_url=$(bosh int ~/.flyrc --path /targets/${fly_target}/api)
        apply_shell_expansion ${src}/${template}/helpers/initial_settings.yml > ${settings_yml}
        ${src}/${template}/helpers/credhub-examples.sh
    else
        echo "--- {}" > ${settings_yml}
    fi
}

[ -n "${template}" ] || usage "ERROR: Missing pipeline template type" 1
[ -d "${target}" ]   || usage "ERROR: ${target} path not found"       1

pattern="^($(tr "\n" "|" <<<"${pipeline_types}" | sed -e "s/\|*$//"))$"
[[ "${template}" =~ ${pattern} ]] || usage "ERROR: ${template} is not a valid pipeline template" 1

echo "Installing ${template} pipeline in ${target}..."
mkdir -p ${target}/ci
cp -R ${src}/${template}/* ${target}/ci/
rm -rf ${target}/ci/helpers
rm -f ${target}/ci/README.md
cp ${src}/repipe ${target}/ci/
[ -f ${target}/ci/settings.yml ] || initial_settings_yml ${template} ${target}
exit 0