private NativeMethods.ReparseDataBuffer GetReparsePointInfo()
{
const uint fileOpenReparsePoint = 0x00200000;
const uint fileFlagBackupSemantics = 0x02000000;
const FileOptions flags = (FileOptions)(fileOpenReparsePoint | fileFlagBackupSemantics);
using (var handle = NativeMethods.CreateFile(LinkName, NativeMethods.FileAccessEx.None, FileShare.Read, IntPtr.Zero, FileMode.Open, flags, IntPtr.Zero))
{
if (handle.IsInvalid)
{
throw Win32Utils.GetExceptionForLastError();
}
var reparseDataBuffer = new NativeMethods.ReparseDataBuffer();
const int fsctlGetReparsePoint = 0x000900A8;
var bytesReturned = 0;
var success = NativeMethods.DeviceIoControl(handle, fsctlGetReparsePoint,
IntPtr.Zero, 0,
reparseDataBuffer, Marshal.SizeOf(typeof(NativeMethods.ReparseDataBuffer)),
ref bytesReturned, IntPtr.Zero);
if (!success)
{
const uint pathNotAReparsePointError = 0x80071126;
if ((uint)Marshal.GetHRForLastWin32Error() == pathNotAReparsePointError)
{
return(null);
}
throw Win32Utils.GetExceptionForLastError();
}
return(reparseDataBuffer);
}
}
public override bool Execute()
{
if (string.IsNullOrEmpty(LinkName))
{
throw new InvalidOperationException("LinkName was not set");
}
if (string.IsNullOrEmpty(TargetName))
{
throw new InvalidOperationException("TargetName was not set");
}
var linkParentDirectory = Path.GetDirectoryName(LinkName.TrimEnd('\\'));
try
{
if (linkParentDirectory != null && !Directory.Exists(linkParentDirectory))
{
Directory.CreateDirectory(linkParentDirectory);
}
}
catch (Exception ex)
{
Log.LogError($"Error creating symbolic link for {LinkName} <<====>> {TargetName}. Could not create parent directory {linkParentDirectory}: {ex.Message}");
return(false);
}
var result = NativeMethods.CreateSymbolicLink(LinkName.TrimEnd('\\'), TargetName.TrimEnd('\\'), _targetType);
if (!result)
{
const uint requiredPrivilegeError = 0x80070522;
if ((uint)Marshal.GetHRForLastWin32Error() == requiredPrivilegeError)
{
Log.LogError($"Error creating symbolic link for {LinkName} <<====>> {TargetName}. Try running the build from an elevated process.");
return(false);
}
var exception = Win32Utils.GetExceptionForLastError();
Log.LogError($"Error creating symbolic link for {LinkName} <<====>> {TargetName}: {exception.Message}");
return(false);
}
Log.LogMessage(MessageImportance.High, $"Symbolic link created for {LinkName} <<====>> {TargetName}");
return(true);
}