progress

type OSBuildOptions struct {
	StoreDir  string
	OutputDir string
	ExtraEnv  []string
	InVm      []string

	// BuildLog writes the osbuild output to the given writer
	BuildLog io.Writer

	CacheMaxSize int64

	Metrics bool
}

type ProgressBar interface {
	// SetProgress sets the progress details at the given "level".
	// Levels should start with "0" and increase as the nesting
	// gets deeper.
	//
	// Note that reducing depth is currently not supported, once
	// a sub-progress is added it cannot be removed/hidden
	// (but if required it can be added, its a SMOP)
	SetProgress(level int, msg string, done int, total int) error

	// The high-level message that is displayed in a spinner
	// that contains the current top level step, for bib this
	// is really just "Manifest generation step" and
	// "Image generation step". We could map this to a three-level
	// progress as well but we spend 90% of the time in the
	// "Image generation step" so the UI looks a bit odd.
	SetPulseMsgf(fmt string, args ...interface{})

	// A high level message with the last operation status.
	// For us this usually comes from the stages and has information
	// like "Starting module org.osbuild.selinux"
	SetMessagef(fmt string, args ...interface{})

	// Start will start rendering the progress information
	Start()

	// Stop will stop rendering the progress information, the
	// screen is not cleared, the last few lines will be visible
	Stop()

	// Write implements io.Writer that is used to capture output
	// that is written after the progress bar is stopped via
	// Stop().
	Write(p []byte) (n int, err error)
}