fix: `helmfile template | kubectl apply -f -` should work (#697)

Fixes #685

pkg/helmexec/exec.go

@@ -95,7 +95,7 @@ func (helm *execer) UpdateDeps(chart string) error {
 func (helm *execer) BuildDeps(chart string) error {
 	helm.logger.Infof("Building dependency %v", chart)
 	out, err := helm.exec([]string{"dependency", "build", chart}, map[string]string{})
-	helm.write(out)
+	helm.info(out)
 	return err
 }
 
@@ -139,7 +139,7 @@ func (helm *execer) DecryptSecret(context HelmContext, name string, flags ...str
 	preArgs := context.GetTillerlessArgs(helm.helmBinary)
 	env := context.getTillerlessEnv()
 	out, err := helm.exec(append(append(preArgs, "secrets", "dec", absPath), flags...), env)
-	helm.write(out)
+	helm.info(out)
 	if err != nil {
 		return "", err
 	}

test/integration/run.sh

@@ -93,6 +93,9 @@ ${helm} status --namespace=${test_ns} httpbin &> /dev/null && fail "release shou
 info "Ensuring \"helmfile delete\" doesn't fail when no releases installed"
 ${helmfile} -f ${dir}/happypath.yaml delete || fail "\"helmfile delete\" shouldn't fail when there are no installed releases"
 
+info "Ensuring \"helmfile template\" output does contain only YAML docs"
+(${helmfile} -f ${dir}/happypath.yaml template | kubectl apply -f -) || fail "\"helmfile template | kubectl apply -f -\" shouldn't fail"
+
 test_pass "happypath"