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user.go
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user.go
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package utils
import (
osuser "os/user"
"strconv"
"strings"
"github.com/pkg/errors"
)
// GetUserDataFromString retrieves uid and gid from a string. The string
// have to be in the "user:group" syntax, or just "user".
func GetUserDataFromString(s string) (int, int, error) {
user := s
var u, g string
if strings.Contains(s, ":") {
dat := strings.Split(user, ":")
us, err := osuser.Lookup(dat[0])
if err != nil {
return 0, 0, errors.Wrapf(err, "while looking up user %s", dat[0])
}
u = us.Uid
group, err := osuser.LookupGroup(dat[1])
if err != nil {
return 0, 0, errors.Wrapf(err, "while looking up group %s", dat[1])
}
g = group.Gid
} else {
us, err := osuser.Lookup(s)
if err != nil {
return 0, 0, errors.Wrapf(err, "while looking up user %s", s)
}
u = us.Uid
g = us.Gid
}
uid, err := strconv.Atoi(u)
if err != nil {
return 0, 0, errors.Wrap(err, "failed converting uid to int")
}
gid, err := strconv.Atoi(g)
if err != nil {
return 0, 0, errors.Wrap(err, "failed converting gid to int")
}
return uid, gid, nil
}