helm: add kube-version and api-versions on CLI args

It makes sense to add that as a CLI args since you could use one single
kustomization file/helm chart for multiple clusters. Also it's easier to
have those on the CLI if the user has some kind of tooling that will end
up calling kustomize and that could pass those (i.e.: ArgoCD is doing
that for Helm so it could do that for Kustomize as well that will end up
calling Helm as well).

Signed-off-by: Arthur Outhenin-Chalandre <arthur.outhenin-chalandre@ledger.fr>

api/internal/builtins/HelmChartInflationGenerator.go

@@ -53,6 +53,15 @@ func (p *HelmChartInflationGeneratorPlugin) Config(
 	if h.GeneralConfig().HelmConfig.Command == "" {
 		return fmt.Errorf("must specify --helm-command")
 	}
+
+	// CLI args takes precedence
+	if h.GeneralConfig().HelmConfig.KubeVersion != "" {
+		p.HelmChart.KubeVersion = h.GeneralConfig().HelmConfig.KubeVersion
+	}
+	if len(h.GeneralConfig().HelmConfig.ApiVersions) != 0 {
+		p.HelmChart.ApiVersions = h.GeneralConfig().HelmConfig.ApiVersions
+	}
+
 	p.h = h
 	if err = yaml.Unmarshal(config, p); err != nil {
 		return

api/types/pluginconfig.go

@@ -4,8 +4,10 @@
 package types
 
 type HelmConfig struct {
-	Enabled bool
-	Command string
+	Enabled     bool
+	Command     string
+	ApiVersions []string
+	KubeVersion string
 }
 
 // PluginConfig holds plugin configuration.

kustomize/commands/build/build.go

@@ -27,10 +27,12 @@ var theFlags struct {
 		managedByLabel bool
 		helm           bool
 	}
-	helmCommand    string
-	loadRestrictor string
-	reorderOutput  string
-	fnOptions      types.FnPluginLoadingOptions
+	helmCommand     string
+	helmApiVersions []string
+	helmKubeVersion string
+	loadRestrictor  string
+	reorderOutput   string
+	fnOptions       types.FnPluginLoadingOptions
 }
 
 type Help struct {
@@ -153,6 +155,8 @@ func HonorKustomizeFlags(kOpts *krusty.Options, flags *flag.FlagSet) *krusty.Opt
 		kOpts.PluginConfig.HelmConfig.Enabled = theFlags.enable.helm
 	}
 	kOpts.PluginConfig.HelmConfig.Command = theFlags.helmCommand
+	kOpts.PluginConfig.HelmConfig.ApiVersions = theFlags.helmApiVersions
+	kOpts.PluginConfig.HelmConfig.KubeVersion = theFlags.helmKubeVersion
 	kOpts.AddManagedbyLabel = isManagedByLabelEnabled()
 	return kOpts
 }

kustomize/commands/build/flagenablehelm.go

@@ -21,4 +21,14 @@ func AddFlagEnableHelm(set *pflag.FlagSet) {
 		"helm-command",
 		"helm", // default
 		"helm command (path to executable)")
+	set.StringArrayVar(
+		&theFlags.helmApiVersions,
+		"helm-api-versions",
+		[]string{}, // default
+		"Kubernetes api versions used by Helm for Capabilities.APIVersions")
+	set.StringVar(
+		&theFlags.helmKubeVersion,
+		"helm-kube-version",
+		"", // default
+		"Kubernetes version used by Helm for Capabilities.KubeVersion")
 }

plugin/builtin/helmchartinflationgenerator/HelmChartInflationGenerator.go

@@ -59,6 +59,15 @@ func (p *plugin) Config(
 	if h.GeneralConfig().HelmConfig.Command == "" {
 		return fmt.Errorf("must specify --helm-command")
 	}
+
+	// CLI args takes precedence
+	if h.GeneralConfig().HelmConfig.KubeVersion != "" {
+		p.HelmChart.KubeVersion = h.GeneralConfig().HelmConfig.KubeVersion
+	}
+	if len(h.GeneralConfig().HelmConfig.ApiVersions) != 0 {
+		p.HelmChart.ApiVersions = h.GeneralConfig().HelmConfig.ApiVersions
+	}
+
 	p.h = h
 	if err = yaml.Unmarshal(config, p); err != nil {
 		return