/// <summary>
/// Fills in the Patch fields in files that require them
/// </summary>
private void BuildPatches()
{
var groups = InstallDirectives.OfType <PatchedFromArchive>()
.GroupBy(p => p.ArchiveHash)
.ToList();
Info("Patching building patches from {0} archives", groups.Count);
var absolute_paths = AllFiles.ToDictionary(e => e.Path, e => e.AbsolutePath);
groups.PMap(group => BuildArchivePatches(group.Key, group, absolute_paths));
if (InstallDirectives.OfType <PatchedFromArchive>().FirstOrDefault(f => f.Patch == null) != null)
{
Error("Missing patches after generation, this should not happen");
}
}