user v0.4.0 This release merges the `github.com/moby/moby/pkg/idtools` package functionality. The package was previously trimmed down and is simplified further to better fit `moby/sys`. Now the package interface will just expand with: - `MkdirAllAndChown` with `WithOnlyNew` as a `MkdirOpt` - `MkdirAndChown` also supporting the opts - `IdentityMapping` its functions `RootPair`, `ToHost`, `ToContainer`, `Empty` Note that the `Identity` type is gone since `SID` was not used in the package or by any of the functions. It is more common to just pass the `uid` and `gid`.