Verify hosts to delete instead of suffixes when cleaning hosts file

Clean(".crc.testing") is rejected by the hosts filter. This is a
mistake.
Without adding a second filter function, we can verify hosts to be
deleted before writing the file.

pkg/hosts/hosts.go

@@ -97,10 +97,6 @@ func (h *Hosts) Remove(hosts []string) error {
 }
 
 func (h *Hosts) Clean(rawSuffixes []string) error {
-	if err := h.verifyHosts(rawSuffixes); err != nil {
-		return err
-	}
-
 	if err := h.checkIsWritable(); err != nil {
 		return err
 	}
@@ -125,6 +121,10 @@ func (h *Hosts) Clean(rawSuffixes []string) error {
 		}
 	}
 
+	if err := h.verifyHosts(toDelete); err != nil {
+		return err
+	}
+
 	for _, host := range toDelete {
 		if err := h.File.RemoveByHostname(host); err != nil {
 			return err

pkg/hosts/hosts_test.go

@@ -84,7 +84,7 @@ func TestSuffixFilter(t *testing.T) {
 	defer os.RemoveAll(dir)
 
 	hostsFile := filepath.Join(dir, "hosts")
-	assert.NoError(t, ioutil.WriteFile(hostsFile, []byte(`127.0.0.1 localhost`), 0600))
+	assert.NoError(t, ioutil.WriteFile(hostsFile, []byte(`127.0.0.1 localhost localhost.localdomain`), 0600))
 
 	file, err := hostsfile.NewCustomHosts(hostsFile)
 	assert.NoError(t, err)
@@ -99,6 +99,8 @@ func TestSuffixFilter(t *testing.T) {
 	assert.Error(t, host.Add("127.0.0.1", []string{"host.poison"}))
 	assert.Error(t, host.Add("127.0.0.1", []string{"CAPITAL.crc.testing"}))
 	assert.Error(t, host.Remove([]string{"localhost"}))
+	assert.NoError(t, host.Clean([]string{".crc.testing"}))
+	assert.Error(t, host.Clean([]string{".localdomain"}))
 }
 
 func hosts(t *testing.T, hostsFile string) Hosts {