feat(backup): Add backup/restore to the server

api/backup/copy.go

@@ -0,0 +1,68 @@
+package backup
+
+import (
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func copyPath(path string, toDir string) error {
+	info, err := os.Stat(path)
+	if err != nil && errors.Is(err, os.ErrNotExist) {
+		// skip copy if file does not exist
+		return nil
+	}
+
+	if !info.IsDir() {
+		destination := filepath.Join(toDir, info.Name())
+		return copyFile(path, destination)
+	}
+
+	return copyDir(path, toDir)
+}
+
+func copyDir(fromDir, toDir string) error {
+	cleanedSourcePath := filepath.Clean(fromDir)
+	parentDirectory := filepath.Dir(cleanedSourcePath)
+	err := filepath.Walk(cleanedSourcePath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		destination := filepath.Join(toDir, strings.TrimPrefix(path, parentDirectory))
+		if info.IsDir() {
+			return nil // skip directory creations
+		}
+
+		if info.Mode()&os.ModeSymlink != 0 { // entry is a symlink
+			return nil // don't copy symlinks
+		}
+
+		return copyFile(path, destination)
+	})
+
+	return err
+}
+
+// copies regular a file from src to dst
+func copyFile(src, dst string) error {
+	from, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer from.Close()
+
+	// has to include 'execute' bit, otherwise fails. MkdirAll follows `mkdir -m` restrictions
+	if err := os.MkdirAll(filepath.Dir(dst), 0744); err != nil {
+		return err
+	}
+	to, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer to.Close()
+
+	_, err = io.Copy(to, from)
+	return err
+}