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#!/bin/bash

set -e

set -u

set -o pipefail

function main() {

if [[ "${CF_STACK:-}" != "cflinuxfs4" && "${CF_STACK:-}" != "cflinuxfs5" ]]; then

echo " **ERROR** Unsupported stack"

echo " See https://docs.cloudfoundry.org/devguide/deploy-apps/stacks.html for more info"

exit 1

local version expected_sha dir

version="1.25.6"

expected_sha="0ed64e3b9cb9b1c2ec57880dae2427b0ee2676f2ae2fb53c2e1bb838c500f9fb"

dir="/tmp/go${version}"

mkdir -p "${dir}"

if [[ ! -f "${dir}/bin/go" ]]; then

local url stack_for_download

# Use cflinuxfs4 binary for cflinuxfs5 (compatible)

stack_for_download="${CF_STACK}"

if [[ "${CF_STACK}" == "cflinuxfs5" ]]; then

stack_for_download="cflinuxfs4"

url="https://buildpacks.cloudfoundry.org/dependencies/go/go_${version}_linux_x64_${stack_for_download}_${expected_sha:0:8}.tgz"

echo "-----> Download go ${version}"

curl "${url}" \

--silent \

--location \

--retry 15 \

--retry-delay 2 \

--output "/tmp/go.tgz"

local sha

sha="$(shasum -a 256 /tmp/go.tgz | cut -d ' ' -f 1)"

if [[ "${sha}" != "${expected_sha}" ]]; then

echo " **ERROR** SHA256 mismatch: got ${sha}, expected ${expected_sha}"

exit 1

tar xzf "/tmp/go.tgz" -C "${dir}"

rm "/tmp/go.tgz"

if [[ ! -f "${dir}/bin/go" ]]; then

echo " **ERROR** Could not download go"

exit 1

GoInstallDir="${dir}"

export GoInstallDir

}

main "${@:-}"