package user import ( "bufio" "errors" "strings" "github.com/spf13/afero" ) // Entry is an entry of a '/etc/passwd' file. type Entry struct { Password string UID string GID string GECOS string Directory string Shell string } // Entries contains the information for each user defined in '/etc/passwd'. type Entries map[string]Entry // Passwd allows to parse users from '/etc/passwd' on the local system. type Passwd struct{} // Parse opens the '/etc/passwd' file and parses it into a map from usernames to Entries. func (p Passwd) Parse(fs afero.Fs) (Entries, error) { return p.parseFile(fs, "/etc/passwd") } // parseFile opens the file and parses it into a map from usernames to Entries. func (p Passwd) parseFile(fs afero.Fs, path string) (Entries, error) { file, err := fs.Open(path) if err != nil { return nil, err } defer file.Close() entries := Entries{} scanner := bufio.NewScanner(file) for scanner.Scan() { // File format: https://man7.org/linux/man-pages/man5/passwd.5.html fields := strings.Split(scanner.Text(), ":") if len(fields) != 7 { return nil, errors.New("invalid number of fields") } entries[fields[0]] = Entry{ Password: fields[1], UID: fields[2], GID: fields[3], GECOS: fields[4], Directory: fields[5], Shell: fields[6], } } return entries, scanner.Err() }