Implement kustomizeOptions

Allows passing flags equivalent to `--enable-helm` via the
environment variable `POLICY_GEN_ENABLE_HELM`

ref: https://issues.redhat.com/browse/ACM-9060
Signed-off-by: Dale Haiducek <[email protected]>

Author: dhaiducek

README.md

@@ -102,6 +102,9 @@ make build
    kustomize build --enable-alpha-plugins
    ```
 
+  **NOTE:** To enable Helm processing when passing a Kustomize directory into the generator, set
+  the environment variable `POLICY_GEN_ENABLE_HELM` to `"true"`.
+
 ### As a standalone binary
 
 In order to bypass Kustomize and run the generator binary directly, change to the directory of PolicyGenerator
@@ -119,7 +122,10 @@ cd examples
 ../PolicyGenerator policyGenerator.yaml
 ```
 
-**NOTE:** To print the trace in the case of an error, you can add the `--debug` flag to the arguments.
+**NOTE:** 
+- To print the trace in the case of an error, you can add the `--debug` flag to the arguments.
+- To enable Helm processing when passing a Kustomize directory into the generator, set
+  the environment variable `POLICY_GEN_ENABLE_HELM` to `"true"`.
 
 ## Additional Policy Generator references
 

internal/utils.go

@@ -360,7 +360,14 @@ func setNamespaceSelector(
 
 // processKustomizeDir runs a provided directory through Kustomize in order to generate the manifests within it.
 func processKustomizeDir(path string) ([]map[string]interface{}, error) {
-	k := krusty.MakeKustomizer(krusty.MakeDefaultOptions())
+	kustomizeOpts := krusty.MakeDefaultOptions()
+
+	if os.Getenv("POLICY_GEN_ENABLE_HELM") == "true" {
+		kustomizeOpts.PluginConfig.HelmConfig.Enabled = true
+		kustomizeOpts.PluginConfig.HelmConfig.Command = "helm"
+	}
+
+	k := krusty.MakeKustomizer(kustomizeOpts)
 
 	resourceMap, err := k.Run(filesys.MakeFsOnDisk(), path)
 	if err != nil {