From f6ad4dcef54c5ce997a4bad5a6d86de229015700 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Tue, 16 Apr 2024 21:25:22 +0200
Subject: Adding upstream version 1.22.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/os/user/lookup.go | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/os/user/lookup.go

(limited to 'src/os/user/lookup.go')

diff --git a/src/os/user/lookup.go b/src/os/user/lookup.go
new file mode 100644
index 0000000..ed33d0c
--- /dev/null
+++ b/src/os/user/lookup.go
@@ -0,0 +1,70 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import "sync"
+
+const (
+	userFile  = "/etc/passwd"
+	groupFile = "/etc/group"
+)
+
+var colon = []byte{':'}
+
+// Current returns the current user.
+//
+// The first call will cache the current user information.
+// Subsequent calls will return the cached value and will not reflect
+// changes to the current user.
+func Current() (*User, error) {
+	cache.Do(func() { cache.u, cache.err = current() })
+	if cache.err != nil {
+		return nil, cache.err
+	}
+	u := *cache.u // copy
+	return &u, nil
+}
+
+// cache of the current user
+var cache struct {
+	sync.Once
+	u   *User
+	err error
+}
+
+// Lookup looks up a user by username. If the user cannot be found, the
+// returned error is of type UnknownUserError.
+func Lookup(username string) (*User, error) {
+	if u, err := Current(); err == nil && u.Username == username {
+		return u, err
+	}
+	return lookupUser(username)
+}
+
+// LookupId looks up a user by userid. If the user cannot be found, the
+// returned error is of type UnknownUserIdError.
+func LookupId(uid string) (*User, error) {
+	if u, err := Current(); err == nil && u.Uid == uid {
+		return u, err
+	}
+	return lookupUserId(uid)
+}
+
+// LookupGroup looks up a group by name. If the group cannot be found, the
+// returned error is of type UnknownGroupError.
+func LookupGroup(name string) (*Group, error) {
+	return lookupGroup(name)
+}
+
+// LookupGroupId looks up a group by groupid. If the group cannot be found, the
+// returned error is of type UnknownGroupIdError.
+func LookupGroupId(gid string) (*Group, error) {
+	return lookupGroupId(gid)
+}
+
+// GroupIds returns the list of group IDs that the user is a member of.
+func (u *User) GroupIds() ([]string, error) {
+	return listGroups(u)
+}
-- 
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