Package cache implements a build artifact cache.

Package codesign provides basic functionalities for ad-hoc code signing of Mach-O files.

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

The getgo command installs Go to the user's system.

Package godebug makes the settings in the $GODEBUG environment variable available to other packages.

Package godebugs provides a table of known GODEBUG settings, for use by a variety of other packages, including internal/godebug, runtime, runtime/metrics, and cmd/go/internal/load.

Package lazyregexp is a thin wrapper over regexp, allowing the use of global regexp variables without forcing them to be compiled at init.

Package load loads packages.

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 modcmd implements the “go mod” command.

Package modget implements the module-aware “go get” command.

Package mvs implements Minimal Version Selection.

Package par implements parallel execution helpers.

Package pkgpath determines the package path used by gccgo/GoLLVM symbols.

Package profile provides a representation of github.com/google/pprof/proto/profile.proto and methods to encode/decode/merge profiles in this format.

Package quoted provides string manipulation utilities.

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

Package run implements the “go run” command.

Package saferio provides I/O functions that avoid allocating large amounts of memory unnecessarily.

Package script implements a small, customizable, platform-agnostic scripting language.

Package str provides string manipulation utilities.

Package tool implements the “go tool” command.

Package toolchain implements dynamic switching of Go toolchains.

Package xcoff implements access to XCOFF (Extended Common Object File Format) files.