This package provides a collection various self sufficient Golang sub-packages:

• bytereplacer - provides a utility for replacing parts of byte

• ctxutil - contains golang.org/x/net/context related utilities

• errorutil - helps make better error messages

• fault - handles fault injection for testing

• jsonconfig - defines a helper type for JSON objects to be used for configuration

• legal - provides in-process storage for compiled-in licenses

• lock - provides a file locking library

• media/heif - reads HEIF containers, as found in Apple HEIC/HEVC images

• must - contains helpers that panic on failure

• net/throttle - provides a net.Listener that returns artificially-delayed connections for testing real-world connectivity slices

• oauthutil - contains OAuth 2 related utilities

• osutil - contains os level functions

• readerutil - contains io.Reader types

• readerutil - provides and operates on io.Readers

• reflectutil - contains reflect utilities

• rollsum - implements rolling checksums similar to apenwarr's bup, which is similar to librsync

• sort - provides primitives for sorting slices and user-defined collections

• strutil - contains string and byte processing functions

• syncutil/singleflight - provides a duplicate function call suppression mechanism

• syncutil/syncdebug - contains facilities for debugging synchronization problems

• syncutil - provides various synchronization utilities

• testing/functest - contains utilities to ease writing table-driven tests for pure functions and method

• types - provides various common types

• wkfs - implements the pluggable well-known filesystem abstraction layer

• writerutil - contains io.Writer types

• xdgdir - implements the Free Desktop Base Directory specification for locating directories