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#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2020-03-21 18:24:59 +0000 (Sat, 21 Mar 2020)
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#
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# https://github.com/harisekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/harisekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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export PATH="$PATH:/usr/local/bin:"~/bin
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target="${FLY_TARGET:-}"
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opts=()
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if [ -n "$target" ]; then
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opts+=(-t "$target")
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fi
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# check fly is in $PATH before we exec which would close the shell if called directly, losing the error message
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# which checks for executable which command -v and type -P don't
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# shellcheck disable=SC2230
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if ! which fly &>/dev/null; then
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if [ -n "${CONCOURSE_URL:-}" ] ||
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[ -n "${CONCOURSE_HOST:-}" ]; then
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protocol="http"
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if [ -n "${CONCOURSE_SSL:-}" ]; then
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protocol=https
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fi
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# give priority to CONCOURSE_URL, otherwise CONCOURSE_HOST must exist and we can construct from there
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if [ -z "${CONCOURSE_URL:-}" ]; then
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CONCOURSE_URL="$protocol://$CONCOURSE_HOST:${CONCOURSE_PORT:-8080}"
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fi
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# this is in $PATH above
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dir=~/bin
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mkdir -pv "$dir"
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os="$(uname -s | tr '[:upper:]' '[:lower:]')"
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echo "Downloading fly for OS = $os" >&2
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wget -cO "$dir/fly" "http://$CONCOURSE_HOST:$CONCOURSE_PORT/api/v1/cli?arch=amd64&platform=$os"
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chmod +x "$dir/fly"
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echo
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else
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echo "'fly' command not found in \$PATH ($PATH)" >&2
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echo >&2
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echo "\$CONCOURSE_URL and \$CONCOURSE_HOST are both unset, cannot download from concourse automatically" >&2
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exit 1
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fi
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fi
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exec fly "${opts[@]}" "$@"
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