// pipeReaders creates goroutines for all readers to copy to stderr & stdout.
func (m *Main) pipeReaders(build *bake.Build, set map[*bake.Build]struct{}) {
// Ignore if the build has already been attached.
if _, ok := set[build]; ok {
return
}
set[build] = struct{}{}
// NOTE: goroutines are closed automatically when build is closed.
go io.Copy(m.Stdout, build.Stdout())
go io.Copy(m.Stderr, build.Stderr())
// Recursively pipe dependencies.
for _, subbuild := range build.Dependencies() {
m.pipeReaders(subbuild, set)
}
}
