mirror of
https://github.com/tailscale/tailscale.git
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0410f1a35a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
50 lines
943 B
Go
50 lines
943 B
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build cgo && !osusergo
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// +build cgo,!osusergo
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package groupmember
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import (
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"os/user"
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"sync"
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)
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func isMemberOfGroup(group, name string) (bool, error) {
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u, err := user.Lookup(name)
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if err != nil {
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return false, err
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}
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ugids, err := u.GroupIds()
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if err != nil {
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return false, err
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}
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gid, err := getGroupID(group)
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if err != nil {
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return false, err
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}
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for _, ugid := range ugids {
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if gid == ugid {
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return true, nil
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}
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}
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return false, nil
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}
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var groupIDCache sync.Map // of string
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func getGroupID(groupName string) (string, error) {
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s, ok := groupIDCache.Load(groupName)
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if ok {
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return s.(string), nil
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}
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g, err := user.LookupGroup(groupName)
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if err != nil {
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return "", err
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}
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groupIDCache.Store(groupName, g.Gid)
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return g.Gid, nil
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}
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