Package auth provides access to user-provided authentication credentials.

Package base defines shared basic pieces of the go command, in particular logging and the Command structure.

Package cache implements a build artifact cache.

Package cfg holds configuration shared by multiple parts of the go command.

Package fsys is an abstraction for reading files that allows for virtual overlays on top of the files on disk.

Package gover implements support for Go toolchain versions like 1.21.0 and 1.21rc1.

Package lockedfile creates and manipulates files whose contents should only change atomically.

The mmap package provides an abstraction for memory mapping files on different platforms.

Package mvs implements Minimal Version Selection.

Package par implements parallel execution helpers.

Package robustio wraps I/O functions that are prone to failure on Windows, transparently retrying errors up to an arbitrary timeout.

Package str provides string manipulation utilities.

Package web defines minimal helper routines for accessing HTTP/HTTPS resources without requiring external dependencies on the net package.