feat: Add `helmfile test --logs` (#1569)

When `--logs` is provided, Helmfile runs `helm test --logs` so that it can stream test logs

Ref #1541

main.go

@@ -478,6 +478,10 @@ func main() {
 					Name:  "cleanup",
 					Usage: "delete test pods upon completion",
 				},
+				cli.BoolFlag{
+					Name:  "logs",
+					Usage: "Dump the logs from test pods (this runs after all tests are complete, but before any cleanup)",
+				},
 				cli.StringFlag{
 					Name:  "args",
 					Value: "",
@@ -662,6 +666,10 @@ func (c configImpl) Cleanup() bool {
 	return c.c.Bool("cleanup")
 }
 
+func (c configImpl) Logs() bool {
+	return c.c.Bool("logs")
+}
+
 func (c configImpl) Timeout() int {
 	if !c.c.IsSet("timeout") {
 		return state.EmptyTimeout

pkg/app/config.go

@@ -110,6 +110,7 @@ type TestConfigProvider interface {
 
 	Timeout() int
 	Cleanup() bool
+	Logs() bool
 
 	concurrencyConfig
 }

pkg/app/run.go

@@ -183,7 +183,7 @@ func (a *App) test(r *Run, c TestConfigProvider) []error {
 
 	r.helm.SetExtraArgs(argparser.GetArgs(c.Args(), r.state)...)
 
-	return st.TestReleases(r.helm, cleanup, timeout, concurrency)
+	return st.TestReleases(r.helm, cleanup, timeout, concurrency, state.Logs(c.Logs()))
 }
 
 func (r *Run) Lint(c LintConfigProvider) []error {

pkg/state/state.go

@@ -1686,8 +1686,26 @@ func (st *HelmState) DeleteReleases(affectedReleases *AffectedReleases, helm hel
 	})
 }
 
+type TestOpts struct {
+	Logs bool
+}
+
+type TestOption func(*TestOpts)
+
+func Logs(v bool) func(*TestOpts) {
+	return func(o *TestOpts) {
+		o.Logs = v
+	}
+}
+
 // TestReleases wrapper for executing helm test on the releases
-func (st *HelmState) TestReleases(helm helmexec.Interface, cleanup bool, timeout int, concurrency int) []error {
+func (st *HelmState) TestReleases(helm helmexec.Interface, cleanup bool, timeout int, concurrency int, options ...TestOption) []error {
+	var opts TestOpts
+
+	for _, o := range options {
+		o(&opts)
+	}
+
 	return st.scatterGatherReleases(helm, concurrency, func(release ReleaseSpec, workerIndex int) error {
 		if !release.Desired() {
 			return nil
@@ -1700,6 +1718,9 @@ func (st *HelmState) TestReleases(helm helmexec.Interface, cleanup bool, timeout
 		if cleanup && !helm.IsHelm3() {
 			flags = append(flags, "--cleanup")
 		}
+		if opts.Logs {
+			flags = append(flags, "--logs")
+		}
 
 		if timeout == EmptyTimeout {
 			flags = append(flags, st.timeoutFlags(helm, &release)...)