Fix redundant helm-dep-build and prepare hook regression (#1566)

Fixes #1511
Fixes #1497

pkg/app/app_test.go

@@ -2237,9 +2237,14 @@ services:
 }
 
 type configImpl struct {
-	set      []string
-	output   string
-	skipDeps bool
+	selectors []string
+	set       []string
+	output    string
+	skipDeps  bool
+}
+
+func (a configImpl) Selectors() []string {
+	return a.selectors
 }
 
 func (c configImpl) Set() []string {
@@ -4160,12 +4165,8 @@ releases:
 		assert.NilError(t, err)
 	})
 
-	expected := "[" +
-		"{\"name\":\"myrelease1\",\"namespace\":\"\",\"enabled\":false,\"labels\":\"id:myrelease1\"}," +
-		"{\"name\":\"myrelease2\",\"namespace\":\"\",\"enabled\":true,\"labels\":\"\"}," +
-		"{\"name\":\"myrelease3\",\"namespace\":\"\",\"enabled\":true,\"labels\":\"\"}," +
-		"{\"name\":\"myrelease4\",\"namespace\":\"\",\"enabled\":true,\"labels\":\"id:myrelease1\"}" +
-		"]\n"
+	expected := `[{"name":"myrelease1","namespace":"","enabled":false,"labels":"id:myrelease1"},{"name":"myrelease2","namespace":"","enabled":true,"labels":""},{"name":"myrelease3","namespace":"","enabled":true,"labels":""},{"name":"myrelease4","namespace":"","enabled":true,"labels":"id:myrelease1"}]
+`
 	assert.Equal(t, expected, out)
 }
 

pkg/state/state.go

@@ -855,7 +855,22 @@ type chartPrepareResult struct {
 //
 // If exists, it will also patch resources by json patches, strategic-merge patches, and injectors.
 func (st *HelmState) PrepareCharts(helm helmexec.Interface, dir string, concurrency int, helmfileCommand string, opts ChartPrepareOptions) (map[string]string, []error) {
-	releases := releasesNeedCharts(st.Releases)
+	var selected []ReleaseSpec
+
+	if len(st.Selectors) > 0 {
+		var err error
+
+		// This and releasesNeedCharts ensures that we run operations like helm-dep-build and prepare-hook calls only on
+		// releases that are (1) selected by the selectors and (2) to be installed.
+		selected, err = st.GetSelectedReleasesWithOverrides()
+		if err != nil {
+			return nil, []error{err}
+		}
+	} else {
+		selected = st.Releases
+	}
+
+	releases := releasesNeedCharts(selected)
 
 	temp := make(map[string]string, len(releases))