feat: deb now fully support config files

deb/deb.go

@@ -184,39 +184,47 @@ func createControl(now time.Time, instSize int64, md5sums []byte, info nfpm.Info
 	}); err != nil {
 		return nil, err
 	}
-	var header = tar.Header{
-		Name:     "control",
-		Size:     int64(body.Len()),
-		Mode:     0644,
-		ModTime:  now,
-		Typeflag: tar.TypeReg,
+
+	for name, content := range map[string][]byte{
+		"control":   body.Bytes(),
+		"md5sums":   md5sums,
+		"conffiles": conffiles(info),
+	} {
+		if err := newFileInsideTarGz(out, name, content, now); err != nil {
+			return nil, err
+		}
 	}
-	if err := out.WriteHeader(&header); err != nil {
-		return nil, errors.Wrap(err, "cannot write header of control file to control.tar.gz")
+
+	if err := out.Close(); err != nil {
+		return nil, errors.Wrap(err, "closing control.tar.gz")
 	}
-	if _, err := out.Write(body.Bytes()); err != nil {
-		return nil, errors.Wrap(err, "cannot write control file to control.tar.gz")
+	if err := compress.Close(); err != nil {
+		return nil, errors.Wrap(err, "closing control.tar.gz")
 	}
+	return buf.Bytes(), nil
+}
 
-	header = tar.Header{
-		Name:     "md5sums",
-		Size:     int64(len(md5sums)),
+func newFileInsideTarGz(out *tar.Writer, name string, content []byte, now time.Time) error {
+	var header = tar.Header{
+		Name:     name,
+		Size:     int64(len(content)),
 		Mode:     0644,
 		ModTime:  now,
 		Typeflag: tar.TypeReg,
 	}
 	if err := out.WriteHeader(&header); err != nil {
-		return nil, errors.Wrap(err, "cannot write header of md5sums file to control.tar.gz")
+		return errors.Wrapf(err, "cannot write header of %s file to control.tar.gz", name)
 	}
-	if _, err := out.Write(md5sums); err != nil {
-		return nil, errors.Wrap(err, "cannot write md5sums file to control.tar.gz")
+	if _, err := out.Write(content); err != nil {
+		return errors.Wrapf(err, "cannot write %s file to control.tar.gz", name)
 	}
+	return nil
+}
 
-	if err := out.Close(); err != nil {
-		return nil, errors.Wrap(err, "closing control.tar.gz")
-	}
-	if err := compress.Close(); err != nil {
-		return nil, errors.Wrap(err, "closing control.tar.gz")
+func conffiles(info nfpm.Info) []byte {
+	var confs []string
+	for _, dst := range info.ConfigFiles {
+		confs = append(confs, dst)
 	}
-	return buf.Bytes(), nil
+	return []byte(strings.Join(confs, "\n") + "\n")
 }

deb/deb_test.go

@@ -87,3 +87,12 @@ func TestDebNoInfo(t *testing.T) {
 	var err = Default.Package(nfpm.WithDefaults(nfpm.Info{}), ioutil.Discard)
 	assert.NoError(t, err)
 }
+
+func TestConffiles(t *testing.T) {
+	out := conffiles(nfpm.Info{
+		ConfigFiles: map[string]string{
+			"fake": "/etc/fake",
+		},
+	})
+	assert.Equal(t, "/etc/fake\n", string(out), "should have a trailing empty line")
+}