fsverity utilities

This is fsverity, a userspace utility for fs-verity. fs-verity is a Linux kernel feature that does transparent on-demand integrity/authenticity verification of the contents of read-only files, using a hidden Merkle tree (hash tree) associated with the file. The mechanism is similar to dm-verity, but implemented at the file level rather than at the block device level. The fsverity utility allows you to set up fs-verity protected files.