Makefile: remove dependency to envsubst binary

Author: chrischdi

Makefile

@@ -127,11 +127,6 @@ CONVERSION_GEN_BIN := conversion-gen
 CONVERSION_GEN := $(abspath $(TOOLS_BIN_DIR)/$(CONVERSION_GEN_BIN))
 CONVERSION_GEN_PKG := k8s.io/code-generator/cmd/conversion-gen
 
-ENVSUBST_BIN := envsubst
-ENVSUBST_VER := $(call get_go_version,github.com/drone/envsubst/v2)
-ENVSUBST := $(abspath $(TOOLS_BIN_DIR)/$(ENVSUBST_BIN)-$(ENVSUBST_VER))
-ENVSUBST_PKG := github.com/drone/envsubst/v2/cmd/envsubst
-
 GO_APIDIFF_VER := v0.8.2
 GO_APIDIFF_BIN := go-apidiff
 GO_APIDIFF := $(abspath $(TOOLS_BIN_DIR)/$(GO_APIDIFF_BIN)-$(GO_APIDIFF_VER))
@@ -615,14 +610,14 @@ generate-e2e-templates-main: $(KUSTOMIZE)
 	$(KUSTOMIZE) build $(INMEMORY_TEMPLATES)/main/cluster-template --load-restrictor LoadRestrictionsNone > $(INMEMORY_TEMPLATES)/main/cluster-template.yaml
 
 .PHONY: generate-metrics-config
-generate-metrics-config: $(ENVSUBST_BIN) ## Generate ./config/metrics/crd-metrics-config.yaml
+generate-metrics-config: ## Generate ./config/metrics/crd-metrics-config.yaml
 	OUTPUT_FILE="./config/metrics/crd-metrics-config.yaml"; \
 	METRIC_TEMPLATES_DIR="./config/metrics/templates"; \
 	echo "# This file was auto-generated via: make generate-metrics-config" > "$${OUTPUT_FILE}"; \
 	cat "$${METRIC_TEMPLATES_DIR}/header.yaml" >> "$${OUTPUT_FILE}"; \
 	for resource in clusterclass cluster kubeadmcontrolplane kubeadmconfig machine machinedeployment machinehealthcheck machineset machinepool; do \
 		cat "$${METRIC_TEMPLATES_DIR}/$${resource}.yaml"; \
-		RESOURCE="$${resource}" ${ENVSUBST_BIN} < "$${METRIC_TEMPLATES_DIR}/common_metrics.yaml"; \
+		sed 's/$${RESOURCE}/'$${resource}'/g' "$${METRIC_TEMPLATES_DIR}/common_metrics.yaml"; \
 		if [[ "$${resource}" != "cluster" ]]; then \
 			cat "$${METRIC_TEMPLATES_DIR}/owner_metric.yaml"; \
 		fi \
@@ -1412,9 +1407,6 @@ $(GOTESTSUM_BIN): $(GOTESTSUM) ## Build a local copy of gotestsum.
 .PHONY: $(GO_APIDIFF_BIN)
 $(GO_APIDIFF_BIN): $(GO_APIDIFF) ## Build a local copy of go-apidiff
 
-.PHONY: $(ENVSUBST_BIN)
-$(ENVSUBST_BIN): $(ENVSUBST) ## Build a local copy of envsubst.
-
 .PHONY: $(KUSTOMIZE_BIN)
 $(KUSTOMIZE_BIN): $(KUSTOMIZE) ## Build a local copy of kustomize.
 
@@ -1473,9 +1465,6 @@ $(GOTESTSUM): # Build gotestsum from tools folder.
 $(GO_APIDIFF): # Build go-apidiff from tools folder.
 	GOBIN=$(TOOLS_BIN_DIR) $(GO_INSTALL) $(GO_APIDIFF_PKG) $(GO_APIDIFF_BIN) $(GO_APIDIFF_VER)
 
-$(ENVSUBST): # Build gotestsum from tools folder.
-	GOBIN=$(TOOLS_BIN_DIR) $(GO_INSTALL) $(ENVSUBST_PKG) $(ENVSUBST_BIN) $(ENVSUBST_VER)
-
 $(KUSTOMIZE): # Build kustomize from tools folder.
 	CGO_ENABLED=0 GOBIN=$(TOOLS_BIN_DIR) $(GO_INSTALL) $(KUSTOMIZE_PKG) $(KUSTOMIZE_BIN) $(KUSTOMIZE_VER)
 

Tiltfile

@@ -1,6 +1,5 @@
 # -*- mode: Python -*-
 
-envsubst_cmd = "./hack/tools/bin/envsubst"
 clusterctl_cmd = "./bin/clusterctl"
 kubectl_cmd = "kubectl"
 kubernetes_version = "v1.31.2"
@@ -498,7 +497,7 @@ def deploy_additional_kustomizations():
         )
 
 def prepare_all():
-    tools_arg = "--tools kustomize,envsubst,clusterctl "
+    tools_arg = "--tools kustomize,clusterctl "
     tilt_settings_file_arg = "--tilt-settings-file " + tilt_file
 
     cmd = "make -B tilt-prepare && ./hack/tools/bin/tilt-prepare {tools_arg}{tilt_settings_file_arg}".format(
@@ -552,7 +551,7 @@ def deploy_templates(filename, label, substitutions):
             deploy_cluster_template(template_name, label, filename, substitutions)
 
 def deploy_clusterclass(clusterclass_name, label, filename, substitutions):
-    apply_clusterclass_cmd = "cat " + filename + " | " + envsubst_cmd + " | " + kubectl_cmd + " apply --namespace=$NAMESPACE -f - && echo \"ClusterClass created from\'" + filename + "\', don't forget to delete\n\""
+    apply_clusterclass_cmd = clusterctl_cmd + " generate yaml --from " + filename + " | " + kubectl_cmd + " apply --namespace=$NAMESPACE -f - && echo \"ClusterClass created from\'" + filename + "\', don't forget to delete\n\""
     delete_clusterclass_cmd = kubectl_cmd + " --namespace=$NAMESPACE delete clusterclass " + clusterclass_name + ' --ignore-not-found=true; echo "\n"'
 
     local_resource(

hack/tools/go.mod

@@ -89,7 +89,7 @@ require (
 	github.com/docker/docker v27.5.1+incompatible // indirect
 	github.com/docker/go-connections v0.5.0 // indirect
 	github.com/docker/go-units v0.4.0 // indirect
-	github.com/drone/envsubst/v2 v2.0.0-20210730161058-179042472c46 // indirect
+	github.com/drone/envsubst/v2 v2.0.0-20210730161058-179042472c46
 	github.com/emicklei/go-restful/v3 v3.12.1 // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/evanphx/json-patch/v5 v5.9.10 // indirect

hack/tools/internal/tilt-prepare/main.go

@@ -34,6 +34,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/drone/envsubst/v2"
 	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 	appsv1 "k8s.io/api/apps/v1"
@@ -61,12 +62,11 @@ import (
 
 /*
 Example call for tilt up:
-	--tools kustomize,envsubst
+	--tools kustomize,clusterctl
 */
 
 const (
 	kustomizePath = "./hack/tools/bin/kustomize"
-	envsubstPath  = "./hack/tools/bin/envsubst"
 )
 
 var (
@@ -718,18 +718,13 @@ func workloadTask(name, workloadType, binaryName, containerName string, liveRelo
 			return
 		}
 
-		envsubstCmd := exec.CommandContext(ctx, envsubstPath)
-		var stdout2, stderr2 bytes.Buffer
-		envsubstCmd.Dir = rootPath
-		envsubstCmd.Stdin = bytes.NewReader(stdout1.Bytes())
-		envsubstCmd.Stdout = &stdout2
-		envsubstCmd.Stderr = &stderr2
-		if err := envsubstCmd.Run(); err != nil {
-			errCh <- errors.Wrapf(err, "[%s] failed to run %s: %s", prefix, envsubstCmd.Args, stderr2.String())
+		out2, err := envsubst.Eval(stdout1.String(), os.Getenv)
+		if err != nil {
+			errCh <- errors.Wrapf(err, "[%s] failed to do envsubst on kustomized output", prefix)
 			return
 		}
 
-		objs, err := utilyaml.ToUnstructured(stdout2.Bytes())
+		objs, err := utilyaml.ToUnstructured([]byte(out2))
 		if err != nil {
 			errCh <- errors.Wrapf(err, "[%s] failed parse components yaml", prefix)
 			return