fly CLI wrapper

fly.sh

#!/bin/bash
# vim: set et sw=4 ts=4 :

set -o errexit
set -o nounset

args=()
target="$(cat ~/.flyrc | y2j | jq -r '.default // ""')"
url=""
command=""

while test "${#@}" -gt 0 ; do
    case "$1" in
        -t|--target)
            target="$2"
            shift 2
            ;;
        --target=*)
            target="${1#*=}"
            shift
            ;;
        --concourse-url)
            url="${2}"
            args+=("$1" "$2")
            shift 2
            ;;
        --concourse-url=*)
            url="${1#*=}"
            args+=("$1")
            shift 2
            ;;
        *)
            if test -z "${command}" ; then
                command="${1}"
            fi
            args+=("$1")
            shift
            ;;
    esac
done

if test -n "${command}" ; then
    binary="fly.real"
    if test -n "${target}" ; then
        args=("-t" "${target}" "${args[@]:-}")
        if test -z "${url}" ; then
            url="$(fly.real targets | awk '$1 == "'"${target}"'" { print $2 }')"
        fi
        info="$(curl --silent "${url%/}/api/v1/info")"
        if echo "${info}" | jq -r .version >/dev/null 2>/dev/null ; then
            binary="fly.real.$(echo "${info}" | jq -r .version)"
            if ! command -v "${binary}" >/dev/null ; then
                # The binary is not available
                cliurl="${url}/api/v1/cli?platform=$(go env GOOS)&arch=$(go env GOARCH)"
                curl -o ~/bin/"${binary}" "${cliurl}"
                chmod a+x ~/bin/"${binary}"
            fi
        fi
    fi

    "${binary}" "${args[@]:-}"
fi

if test -n "${target}" -a '(' "${command}" = "login" -o -z "${command}" ')' ; then
    config="$(cat ~/.flyrc | y2j | jq ".default = \"${target}\"" | j2y)"
    echo "${config}" > ~/.flyrc
    echo "Saving target to ${target}"
fi