xenadmin/XenAdmin/SettingsUpdate.cs

/* Copyright (c) Citrix Systems, Inc. 
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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System;
using System.IO;
using System.Reflection;

namespace XenAdmin
{
    public static class SettingsUpdate
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        // The path of the user.config files looks something like this:
        // <Profile Directory>\<Company Name>\<App Name>_<Evidence Type>_<Evidence Hash>\<Version>\user.config

        /// <summary>
        /// Looks for a config file from a previous installation of the application and updates the settings from it.
        /// </summary>
        public static void Update()
        {
            try
            {
                Assembly a = Assembly.GetExecutingAssembly();
                Version appVersion = a.GetName().Version;

                // get previous config file by enumerating through all the folders in <Profile Directory>\<Company Name> 
                // to find a previous user.config file

                var currentConfigFolder = new DirectoryInfo(Settings.GetUserConfigPath()).Parent;

                if (currentConfigFolder == null)
                    return;

                var appDomainName = AppDomain.CurrentDomain.FriendlyName;
                var companyFolder = currentConfigFolder.Parent != null ? currentConfigFolder.Parent.Parent : null;

                if (companyFolder == null)
                    return;

                FileInfo previousConfig = null;
                Version previousVersion = null;

                foreach (var subDir in companyFolder.GetDirectories("*" + appDomainName + "*", SearchOption.AllDirectories))
                {
                    foreach (var file in subDir.GetFiles("user.config", SearchOption.AllDirectories))
                    {
                        var configFolderName = Path.GetFileName(Path.GetDirectoryName(file.FullName));
                        if (configFolderName != null)
                        {
                            var configVersion = new Version(configFolderName);

                            if ((configVersion <= appVersion) && (previousVersion == null || configVersion > previousVersion))
                            {
                                previousVersion = configVersion;
                                previousConfig = file;
                            }
                        }
                    }
                }
            
                if (previousConfig != null)
                {
                    // copy previous config file to current config location
                    var destinationFile = Path.GetDirectoryName(currentConfigFolder.FullName);

                    destinationFile = Path.Combine(destinationFile, previousVersion.ToString());

                    if (!Directory.Exists(destinationFile))
                        Directory.CreateDirectory(destinationFile);

                    destinationFile = Path.Combine(destinationFile, previousConfig.Name);

                    File.Copy(previousConfig.FullName, destinationFile);

                    // upgrade settings
                    XenAdmin.Properties.Settings.Default.Upgrade();
                }
            }
            catch (Exception ex)
            {
                log.Debug("Exception while updating settings.", ex);
            }
        }
    }
}