Merge "ShouldKeepExistingBuldFileForDir look up by dir"

		// Exact dir match

		return true

	}

	var i int

	// Check if subtree match

	for prefix, recursive := range a.keepExistingBuildFile {

		if recursive {

			if strings.HasPrefix(dir, prefix+"/") {

	for {

		j := strings.Index(dir[i:], "/")

		if j == -1 {

			return false //default

		}

		prefix := dir[0 : i+j]

		i = i + j + 1 // skip the "/"

		if recursive, ok := a.keepExistingBuildFile[prefix]; ok && recursive {

			return true

		}

	}

}

	// Default

	return false

}

var bp2BuildAllowListKey = NewOnceKey("Bp2BuildAllowlist")

var bp2buildAllowlist OncePer