system

type ExecutionResult struct {
	Stdout   []byte
	Stderr   []byte
	ExitCode int
}

type Executor interface {
	Execute(context.Context, cmd.Command) (cmd.Result, error)
}

type FileSystem interface {
	ReadFS
	WriteFS
	StatFS
}

type ReadFS interface {
	Open(ctx context.Context, name string) (fs.File, error)
}

type StatFS interface {
	Stat(ctx context.Context, name string) (fs.FileInfo, error)
}

type System interface {
	io.Closer
	FileSystem
	Executor
}

type WriteFS interface {
	// Create creates or truncates the named file. If the file already exists,
	// it is truncated. If the file does not exist, it is created.
	// The size of the file must be known in advance.
	Create(ctx context.Context, fileInfo fs.FileInfo) (WriteFile, error)
}

type WriteFile interface {
	io.Writer
	io.Closer
}