fixed config backup and restore

esp32/src/FileUtils.cpp

@@ -0,0 +1,81 @@
+#include <Homie.h>
+#include "FileUtils.h"
+
+bool deleteFile(const char *source)
+{
+    Serial << "deleting file " << source << endl;
+    if (!SPIFFS.begin())
+    {
+        return false;
+    }
+    bool deleted = SPIFFS.remove(source);
+    if (deleted)
+    {
+        Serial << "Deleted " << source << endl;
+    }
+    else
+    {
+        Serial << "Could not delete " << source << endl;
+    }
+    return deleted;
+}
+
+void printFile(const char *source)
+{
+    Serial << "printing file " << source << endl;
+    if (!SPIFFS.begin())
+    {
+        Serial << "could not start spiffs " << source << endl;
+        return;
+    }
+    File file = SPIFFS.open(source, FILE_READ);
+    if (!file)
+    {
+        Serial << "could not start open " << source << endl;
+        return;
+    }
+    Serial << file.readString() << endl;
+    Serial << "Finished printing file " << source << endl;
+    file.close();
+}
+
+bool doesFileExist(const char *source)
+{
+    Serial << "checking if file exist " << source << endl;
+    if (!SPIFFS.begin())
+    {
+        return false;
+    }
+    bool exists = SPIFFS.exists(source);
+    Serial << "File " << source << (exists ? "" : " not") << " found " << endl;
+    return exists;
+}
+
+bool copyFile(const char *source, const char *target)
+{
+    Serial << "copy started " << source << " -> " << target << endl;
+    if (!SPIFFS.begin())
+    {
+        return false;
+    }
+
+    File file = SPIFFS.open(source, FILE_READ);
+    File file2 = SPIFFS.open(target, FILE_WRITE);
+    Serial.flush();
+    if (!file)
+    {
+        Serial << "There was an error opening " << source << " for reading" << endl;
+        return false;
+    }
+    if (!file2)
+    {
+        Serial << "There was an error opening " << target << " for reading" << endl;
+        file.close();
+        return false;
+    }
+    file2.println(file.readString());
+    Serial << "copy finished " << source << " -> " << target << endl;
+    file.close();
+    file2.close();
+    return true;
+}