Feat add cascade support (#860)

* feat: add cascade support for helm v3.12.0

Signed-off-by: yxxhero <aiopsclub@163.com>

pkg/testutil/mocks.go

@@ -0,0 +1,148 @@
+package testutil
+
+import (
+	"github.com/blang/semver"
+	"helm.sh/helm/v3/pkg/chart"
+
+	"github.com/helmfile/helmfile/pkg/helmexec"
+)
+
+type noCallHelmExec struct {
+}
+
+type V3HelmExec struct {
+	*noCallHelmExec
+	isHelm3 bool
+}
+
+func NewV3HelmExec(isHelm3 bool) *V3HelmExec {
+	return &V3HelmExec{noCallHelmExec: &noCallHelmExec{}, isHelm3: isHelm3}
+}
+
+type VersionHelmExec struct {
+	*noCallHelmExec
+	version string
+}
+
+func NewVersionHelmExec(version string) *VersionHelmExec {
+	return &VersionHelmExec{noCallHelmExec: &noCallHelmExec{}, version: version}
+}
+
+func (helm *V3HelmExec) IsHelm3() bool {
+	return helm.isHelm3
+}
+
+func (helm *VersionHelmExec) IsVersionAtLeast(ver string) bool {
+	currentSemVer := semver.MustParse(helm.version)
+	verSemVer := semver.MustParse(ver)
+	return currentSemVer.GTE(verSemVer)
+}
+
+func (helm *noCallHelmExec) doPanic() {
+	panic("unexpected call to helm")
+}
+
+func (helm *noCallHelmExec) TemplateRelease(name, chart string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) ChartPull(chart string, path string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) ChartExport(chart string, path string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) UpdateDeps(chart string) error {
+	helm.doPanic()
+	return nil
+}
+
+func (helm *noCallHelmExec) BuildDeps(name, chart string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+
+func (helm *noCallHelmExec) SetExtraArgs(args ...string) {
+	helm.doPanic()
+}
+func (helm *noCallHelmExec) SetHelmBinary(bin string) {
+	helm.doPanic()
+}
+func (helm *noCallHelmExec) SetEnableLiveOutput(enableLiveOutput bool) {
+	helm.doPanic()
+}
+func (helm *noCallHelmExec) SetDisableForceUpdate(forceUpdate bool) {
+	helm.doPanic()
+}
+
+func (helm *noCallHelmExec) AddRepo(name, repository, cafile, certfile, keyfile, username, password string, managed string, passCredentials string, skipTLSVerify string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) UpdateRepo() error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) RegistryLogin(name string, username string, password string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) SyncRelease(context helmexec.HelmContext, name, chart string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) DiffRelease(context helmexec.HelmContext, name, chart string, suppressDiff bool, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) ReleaseStatus(context helmexec.HelmContext, release string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) DeleteRelease(context helmexec.HelmContext, name string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+
+func (helm *noCallHelmExec) List(context helmexec.HelmContext, filter string, flags ...string) (string, error) {
+	helm.doPanic()
+	return "", nil
+}
+
+func (helm *noCallHelmExec) DecryptSecret(context helmexec.HelmContext, name string, flags ...string) (string, error) {
+	helm.doPanic()
+	return "", nil
+}
+func (helm *noCallHelmExec) TestRelease(context helmexec.HelmContext, name string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) Fetch(chart string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) Lint(name, chart string, flags ...string) error {
+	helm.doPanic()
+	return nil
+}
+func (helm *noCallHelmExec) IsHelm3() bool {
+	helm.doPanic()
+	return false
+}
+
+func (helm *noCallHelmExec) GetVersion() helmexec.Version {
+	helm.doPanic()
+	return helmexec.Version{}
+}
+
+func (helm *noCallHelmExec) IsVersionAtLeast(versionStr string) bool {
+	helm.doPanic()
+	return false
+}
+
+func (helm *noCallHelmExec) ShowChart(chartPath string) (chart.Metadata, error) {
+	helm.doPanic()
+	return chart.Metadata{}, nil
+}