From 2d170afaf0e9bf21aec990d1a6f4f0d300b828f7 Mon Sep 17 00:00:00 2001
From: Hyung-Kyu Choi <hqueue@users.noreply.github.com>
Date: Tue, 26 Jun 2018 10:24:23 +0900
Subject: [PATCH] build: clean go build cache when necessary

- clean go build cache when necessary

Signed-off-by: Hyung-Kyu Choi <hqueue@users.noreply.github.com>
---
 Makefile                      |  1 +
 build/clean_go_build_cache.sh | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100755 build/clean_go_build_cache.sh

diff --git a/Makefile b/Makefile
index 5cb9231a18..0c1bb3bce7 100644
--- a/Makefile
+++ b/Makefile
@@ -41,6 +41,7 @@ lint: ## Run linters.
 	build/env.sh go run build/ci.go lint
 
 clean:
+	./build/clean_go_build_cache.sh
 	rm -fr build/_workspace/pkg/ $(GOBIN)/*
 
 # The devtools target installs tools required for 'go generate'.
diff --git a/build/clean_go_build_cache.sh b/build/clean_go_build_cache.sh
new file mode 100755
index 0000000000..42a9799049
--- /dev/null
+++ b/build/clean_go_build_cache.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+function version_gt() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"; }
+function go_version {
+    version=$(go version)
+    echo $version
+        regex="([0-9].[0-9]+.[0-9])"
+        if [[ $version =~ $regex ]]; then 
+            echo ${BASH_REMATCH[1]}
+    fi
+}
+
+golang_version=$(go_version)
+
+# Clean go build cache when go version is greater than or equal to 1.10
+if !(version_gt 1.10 $golang_version); then
+    go clean -cache
+fi