/*
Expected to be invoked as a goroutine which runs in parallel to sending the ssh command to the
far side. This function reads from the input buffer reader br and writes to the target stripping
blank and comment lines as it goes.
*/
func send_script(sess *ssh.Session, argv0 string, env_file string, br *bufio.Reader) {
target, err := sess.StdinPipe() // we create the pipe here so that we can close here
if err != nil {
fmt.Fprintf(os.Stderr, "unable to create stdin for session: %s\n", err)
return
}
defer target.Close()
if argv0 != "" {
target.Write([]byte("ARGV0=\"" + argv0 + "\"\n")) // $0 isn't valid using this, so simulate $0 with argv0
}
if env_file != "" { // must push out the environment first
env_file, err = find_file(env_file) // find it in the path if not a qualified name
if err == nil {
ef, err := os.Open(env_file)
if err != nil {
fmt.Fprintf(os.Stderr, "ssh_broker: could not open environment file: %s: %s\n", env_file, err)
} else {
ebr := bufio.NewReader(ef) // get a buffered reader for the file
send_file(ebr, target)
ef.Close()
}
} else {
fmt.Fprintf(os.Stderr, "ssh_broker: could not find environment file: %s: %s\n", env_file, err)
}
}
send_file(br, target)
}
func (config *Config) executeCommand(s *ssh.Session, cmd string, sudo bool) ([]byte, error) {
if s.Stdout != nil {
return nil, errors.New("ssh: Stdout already set")
}
if s.Stderr != nil {
return nil, errors.New("ssh: Stderr already set")
}
b := newSingleWriterReader()
s.Stdout = &b
s.Stderr = &b
done := make(chan bool)
if sudo {
stdInWriter, err := s.StdinPipe()
if err != nil {
if config.AbortOnError == true {
log.Fatalf("%s", err)
}
return nil, err
}
go config.injectSudoPasswordIfNecessary(done, &b, stdInWriter)
}
err := s.Run(cmd)
close(done)
return b.Bytes(), err
}
func remoteStandardio(
s *ssh.Session) (io.WriteCloser, io.Reader, io.Reader, string) {
var stdin io.WriteCloser
var stdout io.Reader
var stderr io.Reader
var err error
// plumb into standard input
if stdin, err = s.StdinPipe(); err != nil {
return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
}
// plumb into standard output
if stdout, err = s.StdoutPipe(); err != nil {
return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
}
// plumb into standard error
if stderr, err = s.StderrPipe(); err != nil {
return nil, nil, nil, fmt.Sprintf("Error: %v\n", err)
}
return stdin, stdout, stderr, ""
}