/// <summary>
/// Creates a symbolic link to the specified file or directory based on command
/// prompt which allows a simple solution for the elevated execution of this
/// order.
/// </summary>
/// <param name="linkPath">
/// The file or directory to be linked.
/// </param>
/// <param name="destPath">
/// The fully qualified name of the new link.
/// </param>
/// <param name="destIsDir">
/// <see langword="true"/> to determine that the destination path is a
/// directory; otherwise, <see langword="false"/>.
/// </param>
/// <param name="backup">
/// <see langword="true"/> to create an backup for existing files; otherwise,
/// <see langword="false"/>.
/// </param>
/// <param name="elevated">
/// <see langword="true"/> to create this link with highest privileges;
/// otherwise, <see langword="false"/>.
/// </param>
public static bool Create(string linkPath, string destPath, bool destIsDir, bool backup = false, bool elevated = false)
{
#region p/invoke
/*
* The idea was to replace the code below with this code that uses the
* p/invoke method to create symbolic links. But this doesn't work
* without administrator privileges while a CMD function called
* MKLINK can do that simply as normal user...
*
* var dest = PathEx.Combine(targetPath);
* try
* {
* if (targetIsDir)
* {
* if (!Directory.Exists(dest))
* Directory.CreateDirectory(dest);
* }
* else
* {
* if (!File.Exists(dest))
* File.Create(dest).Close();
* }
* }
* catch (Exception ex)
* {
* Log.Write(ex);
* return false;
* }
*
* var link = PathEx.Combine(linkPath);
* try
* {
* var linkDir = Path.GetDirectoryName(link);
* if (linkDir != null && !Directory.Exists(linkDir))
* Directory.CreateDirectory(linkDir);
* }
* catch (Exception ex)
* {
* Log.Write(ex);
* return false;
* }
*
* if (PathEx.DirOrFileExists(link))
* if (!DirIsLink(link) && backup)
* try
* {
* File.Move(link, link + $"-{{{EnvironmentEx.MachineId}}}.backup");
* }
* catch (Exception ex)
* {
* Log.Write(ex);
* return false;
* }
* else
* try
* {
* if (Directory.Exists(link))
* Directory.Delete(link);
* if (File.Exists(link))
* File.Delete(link);
* }
* catch (Exception ex)
* {
* Log.Write(ex);
* }
*
*
* if (!PathEx.DirOrFileExists(dest) || PathEx.DirOrFileExists(link))
* return false;
*
* var created = WinApi.SafeNativeMethods.CreateSymbolicLink(link, dest, (WinApi.SymbolicLinkFlags)Convert.ToInt32(targetIsDir));
* if (created)
* SetAttributes(link, FileAttributes.Hidden);
*
* return created;
*/
#endregion
var dest = PathEx.Combine(destPath);
try
{
if (destIsDir)
{
if (!Directory.Exists(dest))
{
Directory.CreateDirectory(dest);
}
}
else
{
if (!File.Exists(dest))
{
File.Create(dest).Close();
}
}
}
catch (Exception ex) when(ex.IsCaught())
{
Log.Write(ex);
return(false);
}
var link = PathEx.Combine(linkPath);
try
{
var linkDir = Path.GetDirectoryName(link);
if (!Directory.Exists(linkDir) && linkDir != null)
{
Directory.CreateDirectory(linkDir);
}
}
catch (Exception ex) when(ex.IsCaught())
{
Log.Write(ex);
return(false);
}
var sb = new StringBuilder();
if (backup && PathEx.DirOrFileExists(link))
{
if (!DirectoryEx.IsLink(link))
{
var prior = Resources.BackupFormat.FormatCurrent(link, EnvironmentEx.MachineId);
sb.AppendFormatCurrent("MOVE /Y \"{0}\" \"{1}\"", link, prior);
}
else
{
Destroy(link, true, true, elevated);
}
}
if (PathEx.DirOrFileExists(link))
{
if (sb.Length > 0)
{
sb.Append(" & ");
}
sb.AppendFormatCurrent(destIsDir ? "RMDIR /S /Q \"{0}\"" : "DEL /F /Q \"{0}\"", link);
}
if (PathEx.DirOrFileExists(dest))
{
if (sb.Length > 0)
{
sb.Append(" & ");
}
sb.Append("MKLINK");
if (destIsDir)
{
sb.Append(" /J");
}
sb.AppendFormatCurrent(" \"{0}\" \"{1}\" && ATTRIB +H \"{0}\" /L", link, dest);
}
if (sb.Length <= 0)
{
return(false);
}
int?exitCode;
using (var p = CmdExec.Send(sb.ToStringThenClear(), elevated, false))
{
if (p?.HasExited ?? false)
{
p.WaitForExit();
}
exitCode = p?.ExitCode;
}
return(exitCode == 0 && PathEx.DirOrFileIsLink(link));
}
/// <summary> /// Determines whether the specified path is specified as reparse /// point. /// </summary> /// <param name="path"> /// The file or directory to check. /// </param> public static bool DirOrFileIsLink(string path) => IsDir(path) ? DirectoryEx.IsLink(path) : FileEx.IsLink(path);