initial implementation

management/cmd/migrate-idp/backup.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/management/server/types"
+)
+
+const (
+	storeDBFile  = "store.db"
+	eventsDBFile = "events.db"
+)
+
+// backupDatabases creates backups of SQLite database files before migration.
+// For PostgreSQL/MySQL, it prints instructions for the operator to run pg_dump/mysqldump.
+func backupDatabases(dataDir string, engine types.Engine) error {
+	switch engine {
+	case types.SqliteStoreEngine:
+		for _, dbFile := range []string{storeDBFile, eventsDBFile} {
+			src := filepath.Join(dataDir, dbFile)
+			if _, err := os.Stat(src); os.IsNotExist(err) {
+				log.Infof("skipping backup of %s (file does not exist)", src)
+				continue
+			}
+			if err := backupSQLiteFile(src); err != nil {
+				return fmt.Errorf("backup %s: %w", dbFile, err)
+			}
+		}
+	case types.PostgresStoreEngine:
+		log.Warn("PostgreSQL detected — automatic backup is not supported. " +
+			"Please ensure you have a recent pg_dump backup before proceeding.")
+	case types.MysqlStoreEngine:
+		log.Warn("MySQL detected — automatic backup is not supported. " +
+			"Please ensure you have a recent mysqldump backup before proceeding.")
+	}
+	return nil
+}
+
+// backupSQLiteFile copies a SQLite database file to a timestamped backup.
+func backupSQLiteFile(srcPath string) error {
+	timestamp := time.Now().Format("20060102-150405")
+	dstPath := fmt.Sprintf("%s.backup-%s", srcPath, timestamp)
+
+	src, err := os.Open(srcPath)
+	if err != nil {
+		return fmt.Errorf("open source: %w", err)
+	}
+	defer src.Close()
+
+	dst, err := os.Create(dstPath)
+	if err != nil {
+		return fmt.Errorf("create backup: %w", err)
+	}
+	defer dst.Close()
+
+	if _, err := io.Copy(dst, src); err != nil {
+		return fmt.Errorf("copy data: %w", err)
+	}
+
+	log.Infof("backed up %s -> %s", srcPath, dstPath)
+	return nil
+}