use embed instead of base64 encode for defaults (#137)

* use embed instead of base64 encode for defaults

* explain blank import

Makefile

@@ -17,9 +17,6 @@ SUPPORTED_PLATFORMS_WINDOWS ?= "windows/amd64"
 MAKEFILE_PATH = $(dir $(realpath -s $(firstword $(MAKEFILE_LIST))))
 BUILD_DIR_PATH = ${MAKEFILE_PATH}/build
 BINARY_NAME ?= ec2-metadata-mock
-METADATA_DEFAULTS_FILE=${MAKEFILE_PATH}/pkg/config/defaults/aemm-metadata-default-values.json
-ENCODED_METADATA_DEFAULTS=$(shell cat ${METADATA_DEFAULTS_FILE} | base64 | tr -d '\040\011\012\015')
-DEFAULT_VALUES_VAR=github.com/aws/amazon-ec2-metadata-mock/pkg/config/defaults.encodedDefaultValues
 ROOT_VERSION_VAR=github.com/aws/amazon-ec2-metadata-mock/pkg/cmd/root.version
 
 $(shell mkdir -p ${BUILD_DIR_PATH} && touch ${BUILD_DIR_PATH}/_go.mod)
@@ -50,7 +47,7 @@ clean:
 
 compile:
 	@echo ${MAKEFILE_PATH}
-	go build -a -tags aemm${GOOS} -ldflags '-X "${DEFAULT_VALUES_VAR}=${ENCODED_METADATA_DEFAULTS}" -X "${ROOT_VERSION_VAR}=${VERSION}"' -o ${BUILD_DIR_PATH}/${BINARY_NAME} ${MAKEFILE_PATH}/cmd/amazon-ec2-metadata-mock.go
+	go build -a -tags aemm${GOOS} -ldflags '-X "${ROOT_VERSION_VAR}=${VERSION}"' -o ${BUILD_DIR_PATH}/${BINARY_NAME} ${MAKEFILE_PATH}/cmd/amazon-ec2-metadata-mock.go
 
 validate-json:
 	${MAKEFILE_PATH}/scripts/validators/json-validator

pkg/config/defaults/defaults.go

@@ -14,17 +14,14 @@
 package defaults
 
 import (
-	"encoding/base64"
+	// Blank import else compiler complains it's unused
+	_ "embed"
 )
 
-// DO NOT EDIT: encodedDefaultValues is populated by the Makefile.
-var (
-	encodedDefaultValues = "{}"
-	decodedDefaultValues []byte
-)
+//go:embed aemm-metadata-default-values.json
+var defaultValues []byte
 
 // GetDefaultValues returns default metadata values populated via aemm-metadata-default-values.json
 func GetDefaultValues() []byte {
-	decodedDefaultValues, _ := base64.StdEncoding.DecodeString(encodedDefaultValues)
-	return decodedDefaultValues
+	return defaultValues
 }