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144 lines
3.2 KiB
144 lines
3.2 KiB
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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package user
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import (
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"io"
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"os"
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"strconv"
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"golang.org/x/sys/unix"
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)
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// Unix-specific path to the passwd and group formatted files.
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const (
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unixPasswdPath = "/etc/passwd"
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unixGroupPath = "/etc/group"
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)
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func lookupUser(username string) (User, error) {
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return lookupUserFunc(func(u User) bool {
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return u.Name == username
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})
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}
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func lookupUid(uid int) (User, error) {
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return lookupUserFunc(func(u User) bool {
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return u.Uid == uid
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})
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}
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func lookupUserFunc(filter func(u User) bool) (User, error) {
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// Get operating system-specific passwd reader-closer.
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passwd, err := GetPasswd()
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if err != nil {
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return User{}, err
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}
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defer passwd.Close()
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// Get the users.
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users, err := ParsePasswdFilter(passwd, filter)
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if err != nil {
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return User{}, err
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}
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// No user entries found.
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if len(users) == 0 {
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return User{}, ErrNoPasswdEntries
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}
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// Assume the first entry is the "correct" one.
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return users[0], nil
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}
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func lookupGroup(groupname string) (Group, error) {
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return lookupGroupFunc(func(g Group) bool {
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return g.Name == groupname
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})
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}
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func lookupGid(gid int) (Group, error) {
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return lookupGroupFunc(func(g Group) bool {
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return g.Gid == gid
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})
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}
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func lookupGroupFunc(filter func(g Group) bool) (Group, error) {
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// Get operating system-specific group reader-closer.
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group, err := GetGroup()
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if err != nil {
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return Group{}, err
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}
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defer group.Close()
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// Get the users.
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groups, err := ParseGroupFilter(group, filter)
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if err != nil {
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return Group{}, err
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}
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// No user entries found.
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if len(groups) == 0 {
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return Group{}, ErrNoGroupEntries
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}
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// Assume the first entry is the "correct" one.
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return groups[0], nil
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}
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func GetPasswdPath() (string, error) {
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return unixPasswdPath, nil
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}
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func GetPasswd() (io.ReadCloser, error) {
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return os.Open(unixPasswdPath)
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}
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func GetGroupPath() (string, error) {
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return unixGroupPath, nil
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}
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func GetGroup() (io.ReadCloser, error) {
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return os.Open(unixGroupPath)
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}
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// CurrentUser looks up the current user by their user id in /etc/passwd. If the
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// user cannot be found (or there is no /etc/passwd file on the filesystem),
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// then CurrentUser returns an error.
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func CurrentUser() (User, error) {
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return LookupUid(unix.Getuid())
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}
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// CurrentGroup looks up the current user's group by their primary group id's
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// entry in /etc/passwd. If the group cannot be found (or there is no
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// /etc/group file on the filesystem), then CurrentGroup returns an error.
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func CurrentGroup() (Group, error) {
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return LookupGid(unix.Getgid())
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}
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func currentUserSubIDs(fileName string) ([]SubID, error) {
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u, err := CurrentUser()
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if err != nil {
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return nil, err
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}
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filter := func(entry SubID) bool {
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return entry.Name == u.Name || entry.Name == strconv.Itoa(u.Uid)
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}
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return ParseSubIDFileFilter(fileName, filter)
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}
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func CurrentUserSubUIDs() ([]SubID, error) {
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return currentUserSubIDs("/etc/subuid")
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}
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func CurrentUserSubGIDs() ([]SubID, error) {
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return currentUserSubIDs("/etc/subgid")
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}
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func CurrentProcessUIDMap() ([]IDMap, error) {
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return ParseIDMapFile("/proc/self/uid_map")
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}
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func CurrentProcessGIDMap() ([]IDMap, error) {
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return ParseIDMapFile("/proc/self/gid_map")
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}
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