build

#!/usr/bin/env bash
set -eo pipefail

echo "---> Go Buildpack"

# 1. GET ARGS
layers_dir=$1
plan_path=$3

# shellcheck source=/dev/null
. generate-layers.sh "${layers_dir}"
generate_deps_layer build-deps
generate_deps_layer run-deps

# 2. DOWNLOAD go
generate_stack_layer go "${plan_path}" false
go_cache_layer_dir="${layers_dir}/go_cache"

# shellcheck source=/dev/null
. init-stack

# Compares previous go.mod checksum to the current go.mod
local_mod_checksum=$(sha256sum go.mod | cut -d ' ' -f 1 || echo 'not found')
remote_mod_checksum='not found'
if [[ -f "${go_cache_layer_dir}.toml" ]]; then
  remote_mod_checksum=$(yj <"${go_cache_layer_dir}.toml" -t | jq -r .metadata 2>/dev/null || echo 'not found')
fi
mkdir -p "${go_cache_layer_dir}"

if [[ -f go.mod && "${local_mod_checksum}" == "${remote_mod_checksum}" ]]; then
  echo "---> Reusing go.mod"
else
  echo "---> Installing go.mod with go mod vendor"
  rm "${go_cache_layer_dir}/pkg" -rf
  go mod download
fi
cat >"${go_cache_layer_dir}.toml" <<EOL
[types]
cache = true
build = true
launch = false

[metadata]
version = "${local_mod_checksum}"
EOL

go mod vendor
go build -o main -v .
generate-launch.sh "${layers_dir}"