haraldh/dracut — pull request #25 by major (2014-08-04 15:41:38+00:00)
Title: Adding support for read/write filesystem images

A user can provide a filesystem image (`rootfs.img`) inside a compressed tarball and that filesystem image will be mounted read/write. This provides some benefits over a device mapper snapshot overlay, especially when the live system becomes full. The boot command line simple needs `rd.writable.fsimg` added to utilize this feature.