uroot

Documentation

Index

• Variables
• func CreateInitramfs(logger *log.Logger, opts Opts) error
• func ParseExtraFiles(logger *log.Logger, archive *initramfs.Files, extraFiles []string, ...) error
• func ResolvePackagePaths(logger *log.Logger, env golang.Environ, pkgs []string) ([]string, error)
• type Commands
  • func (c Commands) TargetDir() string
• type Opts

Variables

var DefaultRamfs = cpio.ArchiveFromRecords([]cpio.Record{
	cpio.Directory("tcz", 0755),
	cpio.Directory("etc", 0755),
	cpio.Directory("dev", 0755),
	cpio.Directory("tmp", 0777),
	cpio.Directory("ubin", 0755),
	cpio.Directory("usr", 0755),
	cpio.Directory("usr/lib", 0755),
	cpio.Directory("var/log", 0777),
	cpio.Directory("lib64", 0755),
	cpio.Directory("bin", 0755),
	cpio.CharDev("dev/console", 0600, 5, 1),
	cpio.CharDev("dev/tty", 0666, 5, 0),
	cpio.CharDev("dev/null", 0666, 1, 3),
	cpio.CharDev("dev/port", 0640, 1, 4),
	cpio.CharDev("dev/urandom", 0666, 1, 9),
	cpio.StaticFile("etc/resolv.conf", nameserver, 0644),
	cpio.StaticFile("etc/localtime", gmt0, 0644),
})

DefaultRamfs are files that are contained in all u-root initramfs archives by default.

Functions

func CreateInitramfs

func CreateInitramfs(logger *log.Logger, opts Opts) error

CreateInitramfs creates an initramfs built to opts' specifications.

func ParseExtraFiles

func ParseExtraFiles(logger *log.Logger, archive *initramfs.Files, extraFiles []string, lddDeps bool) error

ParseExtraFiles adds files from the extraFiles list to the archive.

The following formats are allowed in the extraFiles list:

• `hostPath:archivePath` adds the file from hostPath at the relative archivePath in the archive.
• `justAPath` is added to the archive under justAPath.

ParseExtraFiles will also add ldd-listed dependencies if lddDeps is true.

func ResolvePackagePaths

func ResolvePackagePaths(logger *log.Logger, env golang.Environ, pkgs []string) ([]string, error)

ResolvePackagePaths takes a list of Go package import paths and directories and turns them into exclusively import paths.

Currently allowed formats:

• package imports; e.g. github.com/u-root/u-root/cmds/ls
• globs of package imports, e.g. github.com/u-root/u-root/cmds/*
• paths to package directories; e.g. $GOPATH/src/github.com/u-root/u-root/cmds/ls
• globs of paths to package directories; e.g. ./cmds/*

Directories may be relative or absolute, with or without globs. Globs are resolved using filepath.Glob.

Types

type Commands

type Commands struct {
	// Builder is the Go compiler mode.
	Builder builder.Builder

	// Packages are the Go packages to compile and add to the archive.
	//
	// Currently allowed formats:
	//
	//   - package imports; e.g. github.com/u-root/u-root/cmds/ls
	//   - globs of package imports; e.g. github.com/u-root/u-root/cmds/*
	//   - paths to package directories; e.g. $GOPATH/src/github.com/u-root/u-root/cmds/ls
	//   - globs of paths to package directories; e.g. ./cmds/*
	//
	// Directories may be relative or absolute, with or without globs.
	// Globs are resolved using filepath.Glob.
	Packages []string

	// BinaryDir is the directory in which the resulting binaries are
	// placed inside the initramfs.
	//
	// BinaryDir may be empty, in which case Builder.DefaultBinaryDir()
	// will be used.
	BinaryDir string
}

Commands specifies a list of Golang packages to build with a builder, e.g. in busybox mode or source mode or binary mode.

See Builder for an explanation of build modes.

func (Commands) TargetDir

func (c Commands) TargetDir() string

TargetDir returns the initramfs binary directory for these Commands.

type Opts

type Opts struct {
	// Env is the Golang build environment (GOOS, GOARCH, etc).
	Env golang.Environ

	// Commands specify packages to build using a specific builder.
	//
	// E.g. the following will build 'ls' and 'ip' in busybox mode, but
	// 'cd' and 'cat' as separate binaries. 'cd', 'cat', 'bb', and symlinks
	// from 'ls' and 'ip' will be added to the final initramfs.
	//
	//   []Commands{
	//     Commands{
	//       Builder: builder.BusyBox,
	//       Packages: []string{
	//         "github.com/u-root/u-root/cmds/ls",
	//         "github.com/u-root/u-root/cmds/ip",
	//       },
	//     },
	//     Commands{
	//       Builder: builder.Binary,
	//       Packages: []string{
	//         "github.com/u-root/u-root/cmds/cd",
	//         "github.com/u-root/u-root/cmds/cat",
	//       },
	//     },
	//   }
	Commands []Commands

	// TempDir is a temporary directory for builders to store files in.
	TempDir string

	// ExtraFiles are files to add to the archive in addition to the Go
	// packages.
	//
	// Shared library dependencies will automatically also be added to the
	// archive using ldd.
	//
	// The following formats are allowed in the list:
	//
	//   - `hostPath:archivePath` adds the file from hostPath at the relative
	//     archivePath in the archive.
	//   - `justAPath` is added to the archive under justAPath.
	ExtraFiles []string

	// OutputFile is the archive output file.
	OutputFile initramfs.Writer

	// BaseArchive is an existing initramfs to include in the resulting
	// initramfs.
	BaseArchive initramfs.Reader

	// UseExistingInit determines whether the existing init from
	// BaseArchive should be used.
	//
	// If this is false, the "init" from BaseArchive will be renamed to
	// "inito".
	UseExistingInit bool

	// InitCmd is the name of a command to link /init to.
	//
	// This can be an absolute path or the name of a command included in
	// Commands.
	//
	// If this is empty, no init symlink will be created.
	InitCmd string

	// DefaultShell is the default shell to start after init.
	//
	// This can be an absolute path or the name of a command included in
	// Commands.
	//
	// This must be specified to have a default shell.
	DefaultShell string
}

Opts are the arguments to CreateInitramfs.

Opts contains everything that influences initramfs creation such as the Go build environment.