#!/bin/bash
set -ueo pipefail

readonly GIT_HASH="$(git rev-parse --short HEAD)"
readonly LDFLAGS="-X main.gitHash=${GIT_HASH} -w -s"
readonly VERSION="1.0.2-${GIT_HASH}"

function build-for() {
    local os="${1}"
    local arch="${2}"
    local target="release/${os}/${arch}"

    echo "Building kontemplate for ${os}-${arch} in ${target}"

    mkdir -p "${target}"

    env GOOS="${os}" GOARCH="${arch}" go build \
        -ldflags "${LDFLAGS}" \
        -o "${target}/kontemplate" \
        -tags netgo
}

function sign-for() {
    local os="${1}"
    local arch="${2}"
    local target="release/${os}/${arch}"
    local bin="${target}/kontemplate"
    local hash="$(sha256sum ${bin})"
    local tar="release/kontemplate-${VERSION}-${os}-${arch}.tar.gz"

    echo "Signing kontemplate binary for ${os}-${arch} with SHA256 ${hash}"
    gpg --sign "${bin}"

    echo "Packing release into ${tar}"
    tar czvf "${tar}" -C "${target}" kontemplate kontemplate.gpg
}

case "${1}" in
    "build")
        # Build releases for various operating systems:
        build-for "linux" "amd64"
        build-for "darwin" "amd64"
        build-for "windows" "amd64"
        build-for "freebsd" "amd64"
        exit 0
        ;;
    "sign")
        # Sign releases:
        sign-for "linux" "amd64"
        sign-for "darwin" "amd64"
        sign-for "windows" "amd64"
        sign-for "freebsd" "amd64"
        exit 0
        ;;
esac