Add --skip-diff-on-install to helmfile diff (#1841)

* Add --skip-diff-on-install to helmfile diff

main.go

@@ -207,6 +207,10 @@ func main() {
 					Name:  "include-needs",
 					Usage: `automatically include releases from the target release's "needs" when --selector/-l flag is provided. Does nothing when when --selector/-l flag is not provided`,
 				},
+				cli.BoolFlag{
+					Name:  "skip-diff-on-install",
+					Usage: "Skips running helm-diff on releases being newly installed on this apply. Useful when the release manifests are too huge to be reviewed, or it's too time-consuming to diff at all",
+				},
 				cli.BoolFlag{
 					Name:  "suppress-secrets",
 					Usage: "suppress secrets in the output. highly recommended to specify on CI/CD use-cases",

pkg/app/app.go

@@ -1440,6 +1440,7 @@ func (a *App) diff(r *Run, c DiffConfigProvider) (*string, bool, bool, []error)
 		Output:            c.DiffOutput(),
 		NoColor:           c.NoColor(),
 		Set:               c.Set(),
+		SkipDiffOnInstall: c.SkipDiffOnInstall(),
 	}
 
 	st.Releases = selectedAndNeededReleases

pkg/app/config.go

@@ -98,6 +98,7 @@ type DiffConfigProvider interface {
 	SuppressSecrets() bool
 	ShowSecrets() bool
 	SuppressDiff() bool
+	SkipDiffOnInstall() bool
 
 	SkipNeeds() bool
 	IncludeNeeds() bool

pkg/app/diff_test.go

@@ -36,6 +36,7 @@ type diffConfig struct {
 	concurrency       int
 	detailedExitcode  bool
 	interactive       bool
+	skipDiffOnInstall bool
 	logger            *zap.SugaredLogger
 }
 
@@ -111,6 +112,10 @@ func (a diffConfig) Interactive() bool {
 	return a.interactive
 }
 
+func (a diffConfig) SkipDiffOnInstall() bool {
+	return a.skipDiffOnInstall
+}
+
 func (a diffConfig) Logger() *zap.SugaredLogger {
 	return a.logger
 }
@@ -129,6 +134,7 @@ func TestDiff(t *testing.T) {
 		loc               string
 		ns                string
 		concurrency       int
+		skipDiffOnInstall bool
 		detailedExitcode  bool
 		error             string
 		flags             flags