Fix bug in arg length to bin/release

bin/build

@@ -8,13 +8,14 @@ set -eu
 bp_dir=$(cd $(dirname $0)/..; pwd) # absolute path
 target_dir="${bp_dir}/target"
 layers_dir="${1:?}"
+platform_dir="${2:?}"
 
 # create a shim cache layer
 cache_dir="${layers_dir}/shim"
 mkdir -p "${cache_dir}"
 echo "cache = true" > ${layers_dir}/shim.toml
 
-"${target_dir}/bin/compile" "$(pwd)" "${cache_dir}" "${2:?}/env"
+"${target_dir}/bin/compile" "$(pwd)" "${cache_dir}" "${platform_dir}/env"
 
 # copy profile.d scripts into a layer so they will be sourced
 home_dir="${layers_dir}/home"
@@ -23,4 +24,4 @@ cp .profile.d/* "${home_dir}/profile.d/"
 echo "launch = true" > ${layers_dir}/home.toml
 
 # run bin/release, read Procfile, and generate launch.toml
-"${bp_dir}/bin/release" "${target_dir}" "${layers_dir}"
+"${bp_dir}/bin/release" "${target_dir}" "${layers_dir}" "${platform_dir}"

cmd/release/main.go

@@ -10,8 +10,8 @@ import (
 )
 
 func main() {
-	if len(os.Args) != 3 {
-		fmt.Println("Usage:", os.Args[0], "TARGET_BUILDPACK_DIR", "LAYERS_DIR")
+	if len(os.Args) != 4 {
+		fmt.Println("Usage:", os.Args[0], "TARGET_BUILDPACK_DIR", "LAYERS_DIR", "PLATFORM_DIR")
 		return
 	}