Make operator-sdk installation more robust

Signed-off-by: chiragkyal <ckyal@redhat.com>

Author: chiragkyal

Makefile

@@ -284,13 +284,8 @@ OPERATOR_SDK ?= $(LOCALBIN)/operator-sdk
 operator-sdk: ## Download operator-sdk locally if necessary.
 ifeq (,$(wildcard $(OPERATOR_SDK)))
 ifeq (, $(shell which operator-sdk 2>/dev/null))
-	@{ \
-	set -e ;\
-	mkdir -p $(dir $(OPERATOR_SDK)) ;\
-	OS=$(shell go env GOOS) && ARCH=$(shell go env GOARCH) && \
-	curl -sSLo $(OPERATOR_SDK) https://github.com/operator-framework/operator-sdk/releases/download/$(OPERATOR_SDK_VERSION)/operator-sdk_$${OS}_$${ARCH} ;\
-	chmod +x $(OPERATOR_SDK) ;\
-	}
+	mkdir -p $(dir $(OPERATOR_SDK))
+	hack/operator-sdk.sh $(OPERATOR_SDK) $(OPERATOR_SDK_VERSION)
 else
 OPERATOR_SDK = $(shell which operator-sdk)
 endif

hack/operator-sdk.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+set -e
+
+OUTPUT_PATH=${1:-./bin/operator-sdk}
+VERSION=${2:-"v1.39.0"}
+
+GOOS=$(go env GOOS)
+GOARCH=$(go env GOARCH)
+BIN="operator-sdk"
+BIN_ARCH="${BIN}_${GOOS}_${GOARCH}"
+OPERATOR_SDK_DL_URL="https://github.com/operator-framework/operator-sdk/releases/download/${VERSION}"
+
+if [[ "$GOOS" != "linux" && "$GOOS" != "darwin" ]]; then
+  echo "Unsupported OS $GOOS"
+  exit 1
+fi
+
+if [[ "$GOARCH" != "amd64" && "$GOARCH" != "arm64" && "$GOARCH" != "ppc64le" && "$GOARCH" != "s390x" ]]; then
+  echo "Unsupported architecture $GOARCH"
+  exit 1
+fi
+
+command -v curl &> /dev/null || { echo "can't find curl command" && exit 1; }
+
+TEMPDIR=$(mktemp -d)
+BIN_PATH="${TEMPDIR}/${BIN_ARCH}"
+
+echo "> downloading binary"
+curl --location -o "${BIN_PATH}" "${OPERATOR_SDK_DL_URL}/operator-sdk_${GOOS}_${GOARCH}"
+
+echo "> installing binary"
+mv "${BIN_PATH}" "${OUTPUT_PATH}"
+chmod +x "${OUTPUT_PATH}"
+rm -rf "${TEMPDIR}"
+
+echo "> operator-sdk binary available at ${OUTPUT_PATH}"