109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
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package user
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import (
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"errors"
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"fmt"
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"syscall"
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)
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var (
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// The current operating system does not provide the required data for user lookups.
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ErrUnsupported = errors.New("user lookup: operating system does not provide passwd-formatted data")
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)
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func lookupUser(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{}, fmt.Errorf("no matching entries in passwd file")
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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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// 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(syscall.Getuid())
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}
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// LookupUser looks up a user by their username in /etc/passwd. If the user
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// cannot be found (or there is no /etc/passwd file on the filesystem), then
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// LookupUser returns an error.
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func LookupUser(username string) (User, error) {
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return lookupUser(func(u User) bool {
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return u.Name == username
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})
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}
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// LookupUid looks up a user by their user id in /etc/passwd. If the user cannot
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// be found (or there is no /etc/passwd file on the filesystem), then LookupId
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// returns an error.
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func LookupUid(uid int) (User, error) {
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return lookupUser(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 lookupGroup(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{}, fmt.Errorf("no matching entries in group file")
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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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// 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(syscall.Getgid())
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}
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// LookupGroup looks up a group by its name in /etc/group. If the group cannot
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// be found (or there is no /etc/group file on the filesystem), then LookupGroup
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// returns an error.
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func LookupGroup(groupname string) (Group, error) {
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return lookupGroup(func(g Group) bool {
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return g.Name == groupname
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})
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}
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// LookupGid looks up a group by its group id in /etc/group. If the group cannot
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// be found (or there is no /etc/group file on the filesystem), then LookupGid
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// returns an error.
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func LookupGid(gid int) (Group, error) {
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return lookupGroup(func(g Group) bool {
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return g.Gid == gid
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})
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}
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