staros/os.go

package staros

import (
	"fmt"
	"os/user"
	"strconv"
)

func parseUint32Identity(kind, raw string) (uint32, error) {
	value, err := strconv.ParseUint(raw, 10, 32)
	if err != nil {
		return 0, fmt.Errorf("parse %s %q: %w", kind, raw, err)
	}
	return uint32(value), nil
}

// GetUidGid
func GetUidGid(uname string) (uint32, uint32, string, error) {
	usr, err := user.Lookup(uname)
	if err != nil {
		return 0, 0, "", err
	}
	uid, err := parseUint32Identity("uid", usr.Uid)
	if err != nil {
		return 0, 0, "", err
	}
	gid, err := parseUint32Identity("gid", usr.Gid)
	if err != nil {
		return 0, 0, "", err
	}
	return uid, gid, usr.HomeDir, nil
}

// GetUid
func GetUid(uname string) (uint32, error) {
	usr, err := user.Lookup(uname)
	if err != nil {
		return 0, err
	}
	return parseUint32Identity("uid", usr.Uid)
}

// GetGid
func GetGid(uname string) (uint32, error) {
	usr, err := user.Lookup(uname)
	if err != nil {
		return 0, err
	}
	return parseUint32Identity("gid", usr.Gid)
}

// GetGidByName
func GetGidByName(uname string) (uint32, error) {
	usr, err := user.LookupGroup(uname)
	if err != nil {
		return 0, err
	}
	return parseUint32Identity("gid", usr.Gid)
}