Fix: only recompute metadata when the version in the metadata changes

.changelog/1458.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+`resource/helm_release`: Fix: only recompute metadata when the version in the metadata changes
+```

helm/resource_release.go

@@ -930,18 +930,16 @@ func resourceDiff(ctx context.Context, d *schema.ResourceDiff, meta interface{})
 	}
 	if d.HasChanges(recomputeMetadataFields...) {
 		d.SetNewComputed("metadata")
-	}
-
-	if !useChartVersion(d.Get("chart").(string), d.Get("repository").(string)) {
-		if d.HasChange("version") {
+	} else if !useChartVersion(d.Get("chart").(string), d.Get("repository").(string)) {
+		if d.HasChange("metadata.0.version") {
 			// only recompute metadata if the version actually changes
 			// chart versioning is not consistent and some will add
 			// a `v` prefix to the chart version after installation
-			old, new := d.GetChange("version")
+			old, new := d.GetChange("metadata.0.version")
 			oldVersion := strings.TrimPrefix(old.(string), "v")
 			newVersion := strings.TrimPrefix(new.(string), "v")
 			debug("%s oldVersion: %s, newVersion: %s", logID, oldVersion, newVersion)
-			if oldVersion != newVersion && newVersion != "" {
+			if oldVersion != newVersion {
 				d.SetNewComputed("metadata")
 			}
 		}

helm/resource_release_test.go

@@ -111,6 +111,48 @@ func TestAccResourceRelease_emptyVersion(t *testing.T) {
 	})
 }
 
+// NOTE this is a regression test for: https://github.com/hashicorp/terraform-provider-helm/issues/1344
+func TestAccResourceRelease_inexactVersion(t *testing.T) {
+	name := randName("basic")
+	namespace := createRandomNamespace(t)
+	defer deleteNamespace(t, namespace)
+
+	resource.Test(t, resource.TestCase{
+		PreCheck: func() { testAccPreCheck(t) },
+		ProviderFactories: map[string]func() (*schema.Provider, error){
+			"helm": func() (*schema.Provider, error) {
+				return Provider(), nil
+			},
+		},
+		CheckDestroy: testAccCheckHelmReleaseDestroy(namespace),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccHelmReleaseConfigBasic(testResourceName, namespace, name, "v1.2"),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("helm_release.test", "version", "1.2.3"),
+					resource.TestCheckResourceAttr("helm_release.test", "metadata.0.version", "1.2.3"),
+				),
+			},
+			{
+				Config:   testAccHelmReleaseConfigBasic(testResourceName, namespace, name, "1.2"),
+				PlanOnly: true,
+			},
+			{
+				Config:   testAccHelmReleaseConfigBasic(testResourceName, namespace, name, "v1.2.x"),
+				PlanOnly: true,
+			},
+			{
+				Config:   testAccHelmReleaseConfigBasic(testResourceName, namespace, name, "1.2.x"),
+				PlanOnly: true,
+			},
+			{
+				Config:   testAccHelmReleaseConfigBasic(testResourceName, namespace, name, "~1.2.2"),
+				PlanOnly: true,
+			},
+		},
+	})
+}
+
 // "upgrade_install" without a previously installed release (effectively equivalent to TestAccResourceRelease_basic)
 func TestAccResourceRelease_upgrade_with_install_coldstart(t *testing.T) {
 	name := randName("basic")