refractor: move internal build function to util.

pkg/util/tools.go

@@ -7,6 +7,8 @@ package util
 import (
 	"encoding/hex"
 	"regexp"
+
+	"github.com/arduino/go-paths-helper"
 )
 
 type RegexReplList []RegexRepl
@@ -67,3 +69,29 @@ func RemoveDuplicate[T comparable](inlist []T) []T {
 	}
 	return list
 }
+
+// CopyTo recursivelly copy all files from a source path to a destination path.
+func CopyTo(src *paths.Path, dst *paths.Path) error {
+	files, err := src.ReadDirRecursiveFiltered(nil,
+		paths.FilterOutDirectories(),
+		paths.FilterOutNames("README.md"),
+	)
+	if err != nil {
+		return err
+	}
+	for _, file := range files {
+		destination, err := file.RelFrom(src)
+		if err != nil {
+			return err
+		}
+		destination = dst.JoinPath(destination)
+		if err := destination.Parent().MkdirAll(); err != nil {
+			return err
+		}
+		if err := file.CopyTo(destination); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+

pkg/util/tools_test.go

@@ -8,6 +8,8 @@ import (
 	"reflect"
 	"regexp"
 	"testing"
+
+	"github.com/arduino/go-paths-helper"
 )
 
 func TestDecodeHexInString(t *testing.T) {
@@ -108,3 +110,44 @@ func TestRegexReplList_Replace(t *testing.T) {
 		})
 	}
 }
+
+func TestCopyTo(t *testing.T) {
+	tests := []struct {
+		name    string
+		src     *paths.Path
+		dst     *paths.Path
+		wantErr bool
+	}{
+		{
+			name:    "default",
+			src:     paths.New("../../apparmor.d/groups/_full/"),
+			dst:     paths.New("../../.build/apparmor.d/groups/_full/"),
+			wantErr: false,
+		},
+		{
+			name:    "issue-source",
+			src:     paths.New("../../apparmor.d/groups/nope/"),
+			dst:     paths.New("../../.build/apparmor.d/groups/_full/"),
+			wantErr: true,
+		},
+		{
+			name:    "issue-dest-1",
+			src:     paths.New("../../apparmor.d/groups/_full/"),
+			dst:     paths.New("/"),
+			wantErr: true,
+		},
+		{
+			name:    "issue-dest-2",
+			src:     paths.New("../../apparmor.d/groups/_full/"),
+			dst:     paths.New("/_full/"),
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := CopyTo(tt.src, tt.dst); (err != nil) != tt.wantErr {
+				t.Errorf("CopyTo() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}