macos gsed support

Makefile

@@ -1,6 +1,25 @@
 
 # Image URL to use all building/pushing image targets
 IMG ?= quay.io/konveyor/oadp-non-admin:latest
+
+SED = sed
+# if on macos, install gsed
+# https://formulae.brew.sh/formula/gnu-sed
+
+# Codecov OS String for use in download url
+ifeq ($(OS),Windows_NT)
+    OS_String = windows
+else
+    UNAME_S := $(shell uname -s)
+    ifeq ($(UNAME_S),Linux)
+        OS_String = linux
+    endif
+    ifeq ($(UNAME_S),Darwin)
+        OS_String = macos
+		SED = gsed
+    endif
+endif
+
 # Kubernetes version from OpenShift 4.16.x https://openshift-release.apps.ci.l2s4.p1.openshiftapps.com/#4-stable
 # ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
 ENVTEST_K8S_VERSION = 1.29
@@ -109,7 +128,7 @@ PLATFORMS ?= linux/arm64,linux/amd64,linux/s390x,linux/ppc64le
 .PHONY: docker-buildx
 docker-buildx: ## Build and push docker image for the manager for cross-platform support
 	# copy existing Dockerfile and insert --platform=${BUILDPLATFORM} into Dockerfile.cross, and preserve the original Dockerfile
-	sed -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
+	$(SED) -e '1 s/\(^FROM\)/FROM --platform=\$$\{BUILDPLATFORM\}/; t' -e ' 1,// s//FROM --platform=\$$\{BUILDPLATFORM\}/' Dockerfile > Dockerfile.cross
 	- $(CONTAINER_TOOL) buildx create --name project-v3-builder
 	$(CONTAINER_TOOL) buildx use project-v3-builder
 	- $(CONTAINER_TOOL) buildx build --push --platform=$(PLATFORMS) --tag ${IMG} -f Dockerfile.cross .
@@ -199,7 +218,7 @@ set -e; \
 package=$(2)@$(3) ;\
 echo "Downloading $${package}" ;\
 GOBIN=$(LOCALBIN) go install $${package} ;\
-mv "$$(echo "$(1)" | sed "s/-$(3)$$//")" $(1) ;\
+mv "$$(echo "$(1)" | $(SED) "s/-$(3)$$//")" $(1) ;\
 }
 endef
 
@@ -287,10 +306,10 @@ endif
 	@{ \
 	NAC_VELERO_VERSION=$(shell grep -I 'github.com/openshift/velero' $(shell pwd)/go.mod | awk -F' ' '{print $$5}') ;\
 	OADP_VELERO_VERSION=$(shell grep -I 'github.com/openshift/velero' $(OADP_OPERATOR_PATH)/go.mod | awk -F' ' '{print $$5}') ;\
-	sed -i "s%$$NAC_VELERO_VERSION%$$OADP_VELERO_VERSION%" $(shell pwd)/go.mod ;\
+	$(SED) -i "s%$$NAC_VELERO_VERSION%$$OADP_VELERO_VERSION%" $(shell pwd)/go.mod ;\
 	for file_name in $(shell ls $(shell pwd)/hack/extra-crds);do \
 		cp $(OADP_OPERATOR_PATH)/config/crd/bases/$$file_name $(shell pwd)/hack/extra-crds/$$file_name && \
-		sed -i "1s%^%# Code generated by make update-velero-manifests. DO NOT EDIT.\n%" $(shell pwd)/hack/extra-crds/$$file_name;done ;\
+		$(SED) -i "1s%^%# Code generated by make update-velero-manifests. DO NOT EDIT.\n%" $(shell pwd)/hack/extra-crds/$$file_name;done ;\¸
 	}
 
 .PHONY: docker-buildx-nac