chore(*): split out unit processing from config.Apply

system/systemd_test.go

@@ -25,13 +25,15 @@ Address=10.209.171.177/19
 	}
 	defer os.RemoveAll(dir)
 
+	sd := &systemd{dir}
+
 	dst := u.Destination(dir)
 	expectDst := path.Join(dir, "run", "systemd", "network", "50-eth0.network")
 	if dst != expectDst {
 		t.Fatalf("unit.Destination returned %s, expected %s", dst, expectDst)
 	}
 
-	if err := PlaceUnit(&u, dst); err != nil {
+	if err := sd.PlaceUnit(&u, dst); err != nil {
 		t.Fatalf("PlaceUnit failed: %v", err)
 	}
 
@@ -100,13 +102,15 @@ Where=/media/state
 	}
 	defer os.RemoveAll(dir)
 
+	sd := &systemd{dir}
+
 	dst := u.Destination(dir)
 	expectDst := path.Join(dir, "etc", "systemd", "system", "media-state.mount")
 	if dst != expectDst {
 		t.Fatalf("unit.Destination returned %s, expected %s", dst, expectDst)
 	}
 
-	if err := PlaceUnit(&u, dst); err != nil {
+	if err := sd.PlaceUnit(&u, dst); err != nil {
 		t.Fatalf("PlaceUnit failed: %v", err)
 	}
 
@@ -155,9 +159,11 @@ func TestMaskUnit(t *testing.T) {
 	}
 	defer os.RemoveAll(dir)
 
+	sd := &systemd{dir}
+
 	// Ensure mask works with units that do not currently exist
 	uf := &Unit{Name: "foo.service"}
-	if err := MaskUnit(uf, dir); err != nil {
+	if err := sd.MaskUnit(uf); err != nil {
 		t.Fatalf("Unable to mask new unit: %v", err)
 	}
 	fooPath := path.Join(dir, "etc", "systemd", "system", "foo.service")
@@ -175,7 +181,7 @@ func TestMaskUnit(t *testing.T) {
 	if _, err := os.Create(barPath); err != nil {
 		t.Fatalf("Error creating new unit file: %v", err)
 	}
-	if err := MaskUnit(ub, dir); err != nil {
+	if err := sd.MaskUnit(ub); err != nil {
 		t.Fatalf("Unable to mask existing unit: %v", err)
 	}
 	barTgt, err := os.Readlink(barPath)
@@ -194,8 +200,10 @@ func TestUnmaskUnit(t *testing.T) {
 	}
 	defer os.RemoveAll(dir)
 
+	sd := &systemd{dir}
+
 	nilUnit := &Unit{Name: "null.service"}
-	if err := UnmaskUnit(nilUnit, dir); err != nil {
+	if err := sd.UnmaskUnit(nilUnit); err != nil {
 		t.Errorf("unexpected error from unmasking nonexistent unit: %v", err)
 	}
 
@@ -211,7 +219,7 @@ func TestUnmaskUnit(t *testing.T) {
 	if err := ioutil.WriteFile(dst, []byte(uf.Content), 700); err != nil {
 		t.Fatalf("Unable to write unit file: %v", err)
 	}
-	if err := UnmaskUnit(uf, dir); err != nil {
+	if err := sd.UnmaskUnit(uf); err != nil {
 		t.Errorf("unmask of non-empty unit returned unexpected error: %v", err)
 	}
 	got, _ := ioutil.ReadFile(dst)
@@ -224,7 +232,7 @@ func TestUnmaskUnit(t *testing.T) {
 	if err := os.Symlink("/dev/null", dst); err != nil {
 		t.Fatalf("Unable to create masked unit: %v", err)
 	}
-	if err := UnmaskUnit(ub, dir); err != nil {
+	if err := sd.UnmaskUnit(ub); err != nil {
 		t.Errorf("unmask of unit returned unexpected error: %v", err)
 	}
 	if _, err := os.Stat(dst); !os.IsNotExist(err) {