/// <summary>
/// Create an AppHost with embedded configuration of app binary location
/// </summary>
/// <param name="appHostSourceFilePath">The path of Apphost template, which has the place holder</param>
/// <param name="appHostDestinationFilePath">The destination path for desired location to place, including the file name</param>
/// <param name="appBinaryFilePath">Full path to app binary or relative path to the result apphost file</param>
/// <param name="windowsGraphicalUserInterface">Specify whether to set the subsystem to GUI. Only valid for PE apphosts.</param>
/// <param name="assemblyToCopyResorcesFrom">Path to the intermediate assembly, used for copying resources to PE apphosts.</param>
public static void CreateAppHost(
string appHostSourceFilePath,
string appHostDestinationFilePath,
string appBinaryFilePath,
bool windowsGraphicalUserInterface = false,
string assemblyToCopyResorcesFrom = null)
{
var bytesToWrite = Encoding.UTF8.GetBytes(appBinaryFilePath);
if (bytesToWrite.Length > 1024)
{
throw new AppNameTooLongException(appBinaryFilePath);
}
BinaryUtils.CopyFile(appHostSourceFilePath, appHostDestinationFilePath);
bool appHostIsPEImage = false;
void RewriteAppHost()
{
// Re-write the destination apphost with the proper contents.
using (var memoryMappedFile = MemoryMappedFile.CreateFromFile(appHostDestinationFilePath))
{
using (MemoryMappedViewAccessor accessor = memoryMappedFile.CreateViewAccessor())
{
BinaryUtils.SearchAndReplace(accessor, AppBinaryPathPlaceholderSearchValue, bytesToWrite);
appHostIsPEImage = PEUtils.IsPEImage(accessor);
if (windowsGraphicalUserInterface)
{
if (!appHostIsPEImage)
{
throw new AppHostNotPEFileException();
}
PEUtils.SetWindowsGraphicalUserInterfaceBit(accessor);
}
}
}
}
void UpdateResources()
{
if (assemblyToCopyResorcesFrom != null && appHostIsPEImage)
{
if (ResourceUpdater.IsSupportedOS())
{
// Copy resources from managed dll to the apphost
new ResourceUpdater(appHostDestinationFilePath)
.AddResourcesFromPEImage(assemblyToCopyResorcesFrom)
.Update();
}
else
{
throw new AppHostCustomizationUnsupportedOSException();
}
}
}
void RemoveSignatureIfMachO()
{
MachOUtils.RemoveSignature(appHostDestinationFilePath);
}
void SetLastWriteTime()
{
// Memory-mapped write does not updating last write time
File.SetLastWriteTimeUtc(appHostDestinationFilePath, DateTime.UtcNow);
}
try
{
if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
var filePermissionOctal = Convert.ToInt32("755", 8); // -rwxr-xr-x
const int EINTR = 4;
int chmodReturnCode = 0;
do
{
chmodReturnCode = chmod(appHostDestinationFilePath, filePermissionOctal);
}while (chmodReturnCode == -1 && Marshal.GetLastWin32Error() == EINTR);
if (chmodReturnCode == -1)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), $"Could not set file permission {filePermissionOctal} for {appHostDestinationFilePath}.");
}
}
RetryUtil.RetryOnIOError(RewriteAppHost);
RetryUtil.RetryOnWin32Error(UpdateResources);
RetryUtil.RetryOnIOError(RemoveSignatureIfMachO);
RetryUtil.RetryOnIOError(SetLastWriteTime);
}
catch (Exception ex)
{
// Delete the destination file so we don't leave an unmodified apphost
try
{
File.Delete(appHostDestinationFilePath);
}
catch (Exception failedToDeleteEx)
{
throw new AggregateException(ex, failedToDeleteEx);
}
throw;
}
}