Pilz.Updating/Pilz.Updating.Client/Utils.cs

namespace Pilz.Updating.Client;

public static class Utils
{
    public static void CopyFiles(DirectoryInfo sourceDir, DirectoryInfo destinationDir)
    {
        if (!destinationDir.Exists)
            destinationDir.Create();

        foreach (FileInfo sFile in sourceDir.EnumerateFiles("*", SearchOption.TopDirectoryOnly))
        {
            var dFile = new FileInfo(Path.Combine(destinationDir.FullName, sFile.Name));
            CopyFile(sFile, dFile);
        }

        foreach (DirectoryInfo sDir in sourceDir.EnumerateDirectories("*", SearchOption.TopDirectoryOnly))
        {
            var dDir = destinationDir.CreateSubdirectory(sDir.Name);
            CopyFiles(sDir, dDir);
        }
    }

    public static void CopyFile(FileInfo sourceFile, FileInfo destinationFile)
    {
        var triesLeft = 1;
        var srcFileName = sourceFile.FullName;
        var destFileName = destinationFile.FullName;
        string? oldFile = null;

        while (triesLeft > 0)
        {
            triesLeft--;

            try
            {
                File.Copy(srcFileName, destFileName, true);
            }
            catch (IOException)
            {
                if (triesLeft == 0 && File.Exists(destFileName))
                {
                    oldFile = destFileName + ".old";
                    File.Move(destFileName, oldFile, true);
                    triesLeft++;
                    Thread.Sleep(100);
                }
            }
            catch (Exception)
            {
            }
        }

        if (oldFile != null)
        {
            try
            {
                File.Delete(oldFile);
            }
            catch (Exception)
            {
            }
        }
    }
}