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https://github.com/yggdrasil-network/yggdrasil-go.git
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ad3be5a04a
`-user foo` would fail with an ugly `panic: strconv.Atoi: parsing "foo": invalid syntax` as returned by `user.LookupId()`, whereas `user.Lookup()` nicely says `panic: user: unknown user foo` In chuser() it does not matter whether we check by ID or name first, so flip the order to get sensible logs without `fmt.Errorf()` wrapping.
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
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package main
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import (
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"fmt"
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"os/user"
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"strconv"
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"strings"
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"golang.org/x/sys/unix"
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)
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func chuser(input string) error {
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givenUser, givenGroup, _ := strings.Cut(input, ":")
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var (
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err error
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usr *user.User
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grp *user.Group
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uid, gid int
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)
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if usr, err = user.LookupId(givenUser); err != nil {
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if usr, err = user.Lookup(givenUser); err != nil {
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return err
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}
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}
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if uid, err = strconv.Atoi(usr.Uid); err != nil {
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return err
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}
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if givenGroup != "" {
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if grp, err = user.LookupGroupId(givenGroup); err != nil {
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if grp, err = user.LookupGroup(givenGroup); err != nil {
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return err
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}
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}
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gid, _ = strconv.Atoi(grp.Gid)
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} else {
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gid, _ = strconv.Atoi(usr.Gid)
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}
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if err := unix.Setgroups([]int{gid}); err != nil {
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return fmt.Errorf("setgroups: %d: %v", gid, err)
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}
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if err := unix.Setgid(gid); err != nil {
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return fmt.Errorf("setgid: %d: %v", gid, err)
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}
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if err := unix.Setuid(uid); err != nil {
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return fmt.Errorf("setuid: %d: %v", uid, err)
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}
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return nil
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}
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