build.sh

#!/bin/bash
#
# for windows and Mac check the README
#
if ! which go &>/dev/null; then
    echo "Go is not installed or is not in \$PATH"
    echo "giving up..."
    exit
fi
BIN_NAME=acme-downloader
PATH=$PATH:$(go env GOPATH)/bin
GOPATH=$(go env GOPATH)
PROG_VERSION="1.0"
BUILDTIME=$(date -u '+%Y-%m-%d_%H:%M:%S')
REPO_DIR=$(dirname $0)
if [ "$REPO_DIR" = '.' ]; then
    REPO_DIR=`pwd`
fi
ln -sf "$REPO_DIR" "${GOPATH}/src/"
REPO_NAME=$(basename "$REPO_DIR")
cd "${GOPATH}/src/$REPO_NAME"

export PATH GOPATH

usage() {
    echo "Usage: $(basename $0)"
    echo "    -h | --help [Print this help and exit]"
    echo "    --os=OS     (Compile binary for this OS)"
    echo "    --arch=ARCH (Compile binary for this Architecture)"
    echo ""
    echo "    Below is a list of supported OS/Arch combinations:"
    echo "OS         ARCH"; go tool dist list | column -t -s '/' --table-columns =======,=======
    exit
}

OPTS=$(getopt -o "h" --longoptions "help,os:,arch:" -- "$@")
eval set -- "$OPTS"

while true; do
    case "$1" in
    -h | --help)
        usage
        ;;
    --os)
        shift
        OS="$1"
        ;;
    --arch)
        shift
        ARCH="$1"
        ;;
    --)
        shift
        break
        ;;
    esac
    shift
done

if [ -z $OS ] || [ -z $ARCH ]; then
    echo -e "\nYou need to supply OS and Architecture\n"
    usage
fi

if [ "$OS" == "windows" ]; then
    BIN_NAME="${BIN_NAME}.exe"
fi

# env GOOS=windows GOARCH=amd64 go build -ldflags "-s -w -X main.appVersion=${PROG_VERSION} -X main.buildTime=${BUILDTIME}" .
env GOOS=$OS GOARCH=$ARCH go get -ldflags "-s -w -X main.appVersion=${PROG_VERSION} -X main.buildTime=${BUILDTIME}" .
if [ $? -gt 0 ]; then
    echo -e "\nthere was an error while compiling the code\n"
    exit
fi

EXECUTABLE_PATH="${GOPATH}/bin/${OS}_${ARCH}/${BIN_NAME}"
[ -f $EXECUTABLE_PATH ] || EXECUTABLE_PATH="${GOPATH}/bin/${BIN_NAME}"

run_upx() {
    if ! which upx &>/dev/null; then
        echo "please download upx here: https://github.com/upx/upx/releases"
        echo "and store the executable within your \$PATH"
        exit
    fi
    upx --brute "$EXECUTABLE_PATH"
}

while true; do
    echo -e "\nUPX degrades performances but in the case of acme-downloader it is not noticeable"
    echo -e "UPX does not work on some OS/Arch combination (I haven't tried them all)\n"
    read -p "Do you wish to run upx against ${BIN_NAME}? (y/n) " yn
    case $yn in
    [Yy]*)
        echo ""
        run_upx
        break
        ;;
    [Nn]*) break ;;
    *)
        echo "Please answer Y|y or N|n."
        ;;
    esac
done

echo -e "\nthe binary was compiled and it is avilable as:\n - \"$EXECUTABLE_PATH\"\n"