Feat add cascade support (helmfile#860)

* feat: add cascade support for helm v3.12.0

Signed-off-by: yxxhero <[email protected]>

cmd/apply.go

@@ -65,6 +65,7 @@ func NewApplyCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 	f.BoolVar(&applyOptions.ReuseValues, "reuse-values", false, `Override helmDefaults.reuseValues "helm upgrade --install --reuse-values"`)
 	f.BoolVar(&applyOptions.ResetValues, "reset-values", false, `Override helmDefaults.reuseValues "helm upgrade --install --reset-values"`)
 	f.StringVar(&applyOptions.PostRenderer, "post-renderer", "", `pass --post-renderer to "helm template" or "helm upgrade --install"`)
+	f.StringVar(&applyOptions.Cascade, "cascade", "", "pass cascade to helm exec, default: background")
 
 	return cmd
 }

cmd/delete.go

@@ -33,6 +33,7 @@ func NewDeleteCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 
 	f := cmd.Flags()
 	f.StringVar(&globalCfg.GlobalOptions.Args, "args", "", "pass args to helm exec")
+	f.StringVar(&deleteOptions.Cascade, "cascade", "", "pass cascade to helm exec, default: background")
 	f.IntVar(&deleteOptions.Concurrency, "concurrency", 0, "maximum number of concurrent helm processes to run, 0 is unlimited")
 	f.BoolVar(&deleteOptions.Purge, "purge", false, "purge releases i.e. free release names and histories")
 	f.BoolVar(&deleteOptions.SkipCharts, "skip-charts", false, "don't prepare charts when deleting releases")

cmd/destroy.go

@@ -32,6 +32,7 @@ func NewDestroyCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 
 	f := cmd.Flags()
 	f.StringVar(&globalCfg.GlobalOptions.Args, "args", "", "pass args to helm exec")
+	f.StringVar(&destroyOptions.Cascade, "cascade", "", "pass cascade to helm exec, default: background")
 	f.IntVar(&destroyOptions.Concurrency, "concurrency", 0, "maximum number of concurrent helm processes to run, 0 is unlimited")
 	f.BoolVar(&destroyOptions.SkipCharts, "skip-charts", false, "don't prepare charts when destroying releases")
 

cmd/sync.go

@@ -45,6 +45,7 @@ func NewSyncCmd(globalCfg *config.GlobalImpl) *cobra.Command {
 	f.BoolVar(&syncOptions.ReuseValues, "reuse-values", false, `Override helmDefaults.reuseValues "helm upgrade --install --reuse-values"`)
 	f.BoolVar(&syncOptions.ResetValues, "reset-values", false, `Override helmDefaults.reuseValues "helm upgrade --install --reset-values"`)
 	f.StringVar(&syncOptions.PostRenderer, "post-renderer", "", `pass --post-renderer to "helm template" or "helm upgrade --install"`)
+	f.StringVar(&syncOptions.Cascade, "cascade", "", "pass cascade to helm exec, default: background")
 
 	return cmd
 }

go.mod

@@ -54,7 +54,7 @@ require (
 	github.com/a8m/envsubst v1.3.0 // indirect
 	github.com/aws/aws-sdk-go v1.44.122 // indirect
 	github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d // indirect
-	github.com/blang/semver v3.5.1+incompatible // indirect
+	github.com/blang/semver v3.5.1+incompatible
 	github.com/dimchansky/utfbom v1.1.1 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/fujiwara/tfstate-lookup v1.1.1 // indirect

pkg/app/app.go

@@ -1441,7 +1441,7 @@ Do you really want to apply?
 
 				subst.Releases = rs
 
-				return subst.DeleteReleasesForSync(&affectedReleases, helm, c.Concurrency())
+				return subst.DeleteReleasesForSync(&affectedReleases, helm, c.Concurrency(), c.Cascade())
 			}))
 
 			if len(deletionErrs) > 0 {
@@ -1560,7 +1560,7 @@ Do you really want to delete?
 
 		if len(releasesToDelete) > 0 {
 			_, deletionErrs := withDAG(st, helm, a.Logger, state.PlanOptions{SelectedReleases: toDelete, Reverse: true, SkipNeeds: true}, a.WrapWithoutSelector(func(subst *state.HelmState, helm helmexec.Interface) []error {
-				return subst.DeleteReleases(&affectedReleases, helm, c.Concurrency(), purge)
+				return subst.DeleteReleases(&affectedReleases, helm, c.Concurrency(), purge, c.Cascade())
 			}))
 
 			if len(deletionErrs) > 0 {
@@ -1832,7 +1832,7 @@ Do you really want to sync?
 
 				subst.Releases = rs
 
-				return subst.DeleteReleasesForSync(&affectedReleases, helm, c.Concurrency())
+				return subst.DeleteReleasesForSync(&affectedReleases, helm, c.Concurrency(), c.Cascade())
 			}))
 
 			if len(deletionErrs) > 0 {

pkg/app/app_test.go

@@ -57,7 +57,7 @@ func expectNoCallsToHelmVersion(app *App) {
 	}
 
 	app.helms = map[helmKey]helmexec.Interface{
-		createHelmKey(app.OverrideHelmBinary, app.OverrideKubeContext): &versionOnlyHelmExec{isHelm3: true},
+		createHelmKey(app.OverrideHelmBinary, app.OverrideKubeContext): testutil.NewV3HelmExec(true),
 	}
 }
 
@@ -2185,8 +2185,9 @@ func (c configImpl) KubeVersion() string {
 }
 
 type applyConfig struct {
-	args   string
-	values []string
+	args    string
+	cascade string
+	values  []string
 
 	// TODO: Remove this function once Helmfile v0.x
 	retainValuesFiles bool
@@ -2230,6 +2231,10 @@ func (a applyConfig) Args() string {
 	return a.args
 }
 
+func (a applyConfig) Cascade() string {
+	return a.cascade
+}
+
 func (a applyConfig) Wait() bool {
 	return a.wait
 }

pkg/app/config.go

@@ -46,6 +46,7 @@ type ReposConfigProvider interface {
 type ApplyConfigProvider interface {
 	Args() string
 	PostRenderer() string
+	Cascade() string
 
 	Values() []string
 	Set() []string
@@ -88,6 +89,7 @@ type ApplyConfigProvider interface {
 type SyncConfigProvider interface {
 	Args() string
 	PostRenderer() string
+	Cascade() string
 
 	Values() []string
 	Set() []string
@@ -144,6 +146,7 @@ type DiffConfigProvider interface {
 // TODO: Remove this function once Helmfile v0.x
 type DeleteConfigProvider interface {
 	Args() string
+	Cascade() string
 
 	Purge() bool
 	SkipDeps() bool
@@ -156,6 +159,7 @@ type DeleteConfigProvider interface {
 
 type DestroyConfigProvider interface {
 	Args() string
+	Cascade() string
 
 	SkipDeps() bool
 	SkipCharts() bool

pkg/app/destroy_test.go

@@ -34,6 +34,7 @@ func listFlags(namespace, kubeContext string) string {
 
 type destroyConfig struct {
 	args                   string
+	cascade                string
 	concurrency            int
 	interactive            bool
 	skipDeps               bool
@@ -46,6 +47,10 @@ func (d destroyConfig) Args() string {
 	return d.args
 }
 
+func (d destroyConfig) Cascade() string {
+	return d.cascade
+}
+
 func (d destroyConfig) SkipCharts() bool {
 	return d.skipCharts
 }

pkg/config/apply.go

@@ -56,6 +56,8 @@ type ApplyOptions struct {
 	ResetValues bool
 	// Propagate '--post-renderer' to helmv3 template and helm install
 	PostRenderer string
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade string
 }
 
 // NewApply creates a new Apply
@@ -212,3 +214,8 @@ func (a *ApplyImpl) ResetValues() bool {
 func (a *ApplyImpl) PostRenderer() string {
 	return a.ApplyOptions.PostRenderer
 }
+
+// Cascade returns cascade flag
+func (a *ApplyImpl) Cascade() string {
+	return a.ApplyOptions.Cascade
+}

pkg/config/delete.go

@@ -9,6 +9,8 @@ type DeleteOptions struct {
 	Purge bool
 	// SkipCharts makes Delete skip `withPreparedCharts`
 	SkipCharts bool
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade string
 }
 
 // NewDeleteOptions creates a new Apply
@@ -44,3 +46,8 @@ func (c *DeleteImpl) Purge() bool {
 func (c *DeleteImpl) SkipCharts() bool {
 	return c.DeleteOptions.SkipCharts
 }
+
+// Cascade returns cascade flag
+func (c *DeleteImpl) Cascade() string {
+	return c.DeleteOptions.Cascade
+}

pkg/config/destroy.go

@@ -6,6 +6,8 @@ type DestroyOptions struct {
 	Concurrency int
 	// SkipCharts makes Destroy skip `withPreparedCharts`
 	SkipCharts bool
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade string
 }
 
 // NewDestroyOptions creates a new Apply
@@ -36,3 +38,8 @@ func (c *DestroyImpl) Concurrency() int {
 func (c *DestroyImpl) SkipCharts() bool {
 	return c.DestroyOptions.SkipCharts
 }
+
+// Cascade returns cascade flag
+func (c *DestroyImpl) Cascade() string {
+	return c.DestroyOptions.Cascade
+}

pkg/config/sync.go

@@ -28,6 +28,8 @@ type SyncOptions struct {
 	ResetValues bool
 	// Propagate '--post-renderer' to helmv3 template and helm install
 	PostRenderer string
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade string
 }
 
 // NewSyncOptions creates a new Apply
@@ -118,3 +120,8 @@ func (t *SyncImpl) ResetValues() bool {
 func (t *SyncImpl) PostRenderer() string {
 	return t.SyncOptions.PostRenderer
 }
+
+// Cascade returns cascade flag
+func (t *SyncImpl) Cascade() string {
+	return t.SyncOptions.Cascade
+}

pkg/state/helmx.go

@@ -39,6 +39,24 @@ func (st *HelmState) appendPostRenderFlags(flags []string, release *ReleaseSpec,
 	return flags
 }
 
+// append post-renderer flags to helm flags
+func (st *HelmState) appendCascadeFlags(flags []string, helm helmexec.Interface, release *ReleaseSpec, cascade string) []string {
+	// see https://github.com/helm/helm/releases/tag/v3.12.0
+	if !helm.IsVersionAtLeast("3.12.0") {
+		return flags
+	}
+	switch {
+	// postRenderer arg comes from cmd flag.
+	case release.Cascade != nil && *release.Cascade != "":
+		flags = append(flags, "--cascade", *release.Cascade)
+	case cascade != "":
+		flags = append(flags, "--cascade", cascade)
+	case st.HelmDefaults.Cascade != nil && *st.HelmDefaults.Cascade != "":
+		flags = append(flags, "--cascade", *st.HelmDefaults.Cascade)
+	}
+	return flags
+}
+
 type Chartify struct {
 	Opts  *chartify.ChartifyOpts
 	Clean func()

pkg/state/helmx_test.go

@@ -0,0 +1,75 @@
+package state
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/helmfile/helmfile/pkg/helmexec"
+	"github.com/helmfile/helmfile/pkg/testutil"
+)
+
+func TestAppendCascadeFlags(t *testing.T) {
+	type args struct {
+		flags    []string
+		release  *ReleaseSpec
+		cascade  string
+		helm     helmexec.Interface
+		helmSpec HelmSpec
+		expected []string
+	}
+	tests := []struct {
+		name string
+		args args
+	}{
+		{
+			name: "no cascade when helm less than 3.11.0",
+			args: args{
+				flags:    []string{},
+				release:  &ReleaseSpec{},
+				cascade:  "background",
+				helm:     testutil.NewVersionHelmExec("3.11.0"),
+				expected: []string{},
+			},
+		},
+		{
+			name: "cascade from release",
+			args: args{
+				flags:    []string{},
+				release:  &ReleaseSpec{Cascade: &[]string{"background", "background"}[0]},
+				cascade:  "",
+				helm:     testutil.NewVersionHelmExec("3.12.0"),
+				expected: []string{"--cascade", "background"},
+			},
+		},
+		{
+			name: "cascade from cmd flag",
+			args: args{
+				flags:    []string{},
+				release:  &ReleaseSpec{},
+				cascade:  "background",
+				helm:     testutil.NewVersionHelmExec("3.12.0"),
+				expected: []string{"--cascade", "background"},
+			},
+		},
+		{
+			name: "cascade from helm defaults",
+			args: args{
+				flags:    []string{},
+				release:  &ReleaseSpec{},
+				helmSpec: HelmSpec{Cascade: &[]string{"background", "background"}[0]},
+				cascade:  "",
+				helm:     testutil.NewVersionHelmExec("3.12.0"),
+				expected: []string{"--cascade", "background"},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			st := &HelmState{}
+			st.HelmDefaults = tt.args.helmSpec
+			got := st.appendCascadeFlags(tt.args.flags, tt.args.helm, tt.args.release, tt.args.cascade)
+			require.Equalf(t, tt.args.expected, got, "appendCascadeFlags() = %v, want %v", got, tt.args.expected)
+		})
+	}
+}

pkg/state/state.go

@@ -187,6 +187,8 @@ type HelmSpec struct {
 	ReuseValues bool `yaml:"reuseValues"`
 	// Propagate '--post-renderer' to helmv3 template and helm install
 	PostRenderer *string `yaml:"postRenderer,omitempty"`
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade *string `yaml:"cascade,omitempty"`
 
 	TLS                      bool   `yaml:"tls"`
 	TLSCACert                string `yaml:"tlsCACert,omitempty"`
@@ -360,6 +362,9 @@ type ReleaseSpec struct {
 	// Propagate '--post-renderer' to helmv3 template and helm install
 	PostRenderer *string `yaml:"postRenderer,omitempty"`
 
+	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
+	Cascade *string `yaml:"cascade,omitempty"`
+
 	// Inherit is used to inherit a release template from a release or another release template
 	Inherit Inherits `yaml:"inherit,omitempty"`
 }
@@ -767,7 +772,7 @@ func ReleaseToID(r *ReleaseSpec) string {
 }
 
 // DeleteReleasesForSync deletes releases that are marked for deletion
-func (st *HelmState) DeleteReleasesForSync(affectedReleases *AffectedReleases, helm helmexec.Interface, workerLimit int) []error {
+func (st *HelmState) DeleteReleasesForSync(affectedReleases *AffectedReleases, helm helmexec.Interface, workerLimit int, cascade string) []error {
 	errs := []error{}
 
 	releases := st.Releases
@@ -801,7 +806,9 @@ func (st *HelmState) DeleteReleasesForSync(affectedReleases *AffectedReleases, h
 					if release.Namespace != "" {
 						args = append(args, "--namespace", release.Namespace)
 					}
-					deletionFlags := st.appendConnectionFlags(args, release)
+					args = st.appendConnectionFlags(args, release)
+					deletionFlags := st.appendCascadeFlags(args, helm, release, cascade)
+
 					m.Lock()
 					start := time.Now()
 					if _, err := st.triggerReleaseEvent("preuninstall", nil, release, "sync"); err != nil {
@@ -2031,15 +2038,17 @@ func (st *HelmState) ReleaseStatuses(helm helmexec.Interface, workerLimit int) [
 }
 
 // DeleteReleases wrapper for executing helm delete on the releases
-func (st *HelmState) DeleteReleases(affectedReleases *AffectedReleases, helm helmexec.Interface, concurrency int, purge bool) []error {
+func (st *HelmState) DeleteReleases(affectedReleases *AffectedReleases, helm helmexec.Interface, concurrency int, purge bool, cascade string) []error {
 	return st.scatterGatherReleases(helm, concurrency, func(release ReleaseSpec, workerIndex int) error {
 		st.ApplyOverrides(&release)
 
 		flags := make([]string, 0)
 		flags = st.appendConnectionFlags(flags, &release)
+		flags = st.appendCascadeFlags(flags, helm, &release, cascade)
 		if release.Namespace != "" {
 			flags = append(flags, "--namespace", release.Namespace)
 		}
+
 		context := st.createHelmContext(&release, workerIndex)
 
 		start := time.Now()

pkg/state/state_test.go

@@ -2647,7 +2647,7 @@ func TestHelmState_Delete(t *testing.T) {
 				helm.Lists[exectest.ListKey{Filter: "^" + name + "$", Flags: tt.flags}] = name
 			}
 			affectedReleases := AffectedReleases{}
-			errs := state.DeleteReleases(&affectedReleases, helm, 1, tt.purge)
+			errs := state.DeleteReleases(&affectedReleases, helm, 1, tt.purge, "")
 			if errs != nil {
 				if !tt.wantErr || len(affectedReleases.Failed) != 1 || affectedReleases.Failed[0].Name != release.Name {
 					t.Errorf("DeleteReleases() for %s error = %v, wantErr %v", tt.name, errs, tt.wantErr)