package version

import (
	"fmt"
	"regexp"
)

var BranchPath = "/var/lib/os-branch"

// Parse extracts version from LABEL="rootfs-XXXX"
func Parse(label string) (string, error) {
	re := regexp.MustCompile(`LABEL="rootfs-([0-9]+)"`)
	m := re.FindStringSubmatch(label)
	if len(m) < 2 {
		return "", fmt.Errorf("version not found in: %s", label)
	}
	return m[1], nil
}