43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
// Copyright 2016 The Go 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 (dragonfly || darwin || freebsd || hurd || (!android && linux) || netbsd || openbsd || (solaris && !illumos)) && cgo && !osusergo
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package user
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import (
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"fmt"
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"strconv"
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"syscall"
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"unsafe"
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)
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const maxGroups = 2048
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func listGroups(u *User) ([]string, error) {
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ug, err := strconv.Atoi(u.Gid)
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if err != nil {
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return nil, fmt.Errorf("user: list groups for %s: invalid gid %q", u.Username, u.Gid)
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}
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userGID := syscall.Gid_t(ug)
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nameC := make([]byte, len(u.Username)+1)
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copy(nameC, u.Username)
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n := int32(256)
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gidsC := make([]syscall.Gid_t, n)
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rv := getGroupList((*byte)(unsafe.Pointer(&nameC[0])), userGID, &gidsC[0], &n)
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if rv == -1 {
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// Mac is the only Unix that does not set n properly when rv == -1, so
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// we need to use different logic for Mac vs. the other OS's.
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if err := groupRetry(u.Username, nameC, userGID, &gidsC, &n); err != nil {
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return nil, err
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}
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}
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gidsC = gidsC[:n]
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gids := make([]string, 0, n)
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for _, g := range gidsC[:n] {
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gids = append(gids, strconv.Itoa(int(g)))
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}
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return gids, nil
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}
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