immucore/internal/utils/mounts.go

package utils

import (
	"fmt"
	"os"
	"strings"
)

// https://github.com/kairos-io/packages/blob/7c3581a8ba6371e5ce10c3a98bae54fde6a505af/packages/system/dracut/immutable-rootfs/30cos-immutable-rootfs/cos-mount-layout.sh#L58

// input: LABEL=FOO:/mount
// output: /dev/disk...:/mount
func ParseMount(s string) string {
	switch {
	case strings.Contains(s, "UUID="):
		dat := strings.Split(s, "UUID=")
		return fmt.Sprintf("/dev/disk/by-uuid/%s", dat[1])
	case strings.Contains(s, "LABEL="):
		dat := strings.Split(s, "LABEL=")
		return fmt.Sprintf("/dev/disk/by-label/%s", dat[1])
	default:
		return s
	}
}

func ReadCMDLineArg(arg string) []string {
	cmdLine, err := os.ReadFile("/proc/cmdline")
	if err != nil {
		return []string{}
	}
	res := []string{}
	fields := strings.Fields(string(cmdLine))
	for _, f := range fields {
		if strings.HasPrefix(f, arg) {
			dat := strings.Split(f, arg)
			res = append(res, dat[1])
		}
	}
	return res
}