func Start(tree *processtree.ProcessTree, done chan bool) chan bool {
quit := make(chan bool)
go func() {
path, _ := filepath.Abs(unixsocket.ZeusSockName())
addr, err := net.ResolveUnixAddr("unix", path)
if err != nil {
zerror.Error("Can't open socket.")
}
listener, err := net.ListenUnix("unix", addr)
if err != nil {
zerror.ErrorCantCreateListener()
}
connections := make(chan *unixsocket.Usock)
go func() {
for {
if conn, err := listener.AcceptUnix(); err != nil {
zerror.ErrorUnableToAcceptSocketConnection()
time.Sleep(500 * time.Millisecond)
} else {
connections <- unixsocket.New(conn)
}
}
}()
for {
select {
case <-quit:
listener.Close()
done <- true
return
case conn := <-connections:
go handleClientConnection(tree, conn)
}
}
}()
return quit
}
func Run(args []string, input io.Reader, output *os.File) int {
if os.Getenv("RAILS_ENV") != "" {
println("Warning: Specifying a Rails environment via RAILS_ENV has no effect for commands run with zeus.")
println("As a safety precaution to protect you from nuking your development database,")
println("Zeus will now cowardly refuse to proceed. Please unset RAILS_ENV and try again.")
return 1
}
isTerminal := ttyutils.IsTerminal(output.Fd())
var master, slave *os.File
var err error
if isTerminal {
master, slave, err = pty.Open()
} else {
master, slave, err = unixsocket.Socketpair(syscall.SOCK_STREAM)
}
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
defer master.Close()
var oldState *ttyutils.Termios
if isTerminal {
oldState, err = ttyutils.MakeTerminalRaw(output.Fd())
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
defer ttyutils.RestoreTerminalState(output.Fd(), oldState)
}
// should this happen if we're running over a pipe? I think maybe not?
ttyutils.MirrorWinsize(output, master)
addr, err := net.ResolveUnixAddr("unixgram", unixsocket.ZeusSockName())
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
conn, err := net.DialUnix("unix", nil, addr)
if err != nil {
zerror.ErrorCantConnectToMaster()
return 1
}
usock := unixsocket.New(conn)
msg := messages.CreateCommandAndArgumentsMessage(args, os.Getpid())
usock.WriteMessage(msg)
err = sendCommandLineArguments(usock, args)
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
usock.WriteFD(int(slave.Fd()))
slave.Close()
msg, err = usock.ReadMessage()
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
parts := strings.Split(msg, "\000")
commandPid, err := strconv.Atoi(parts[0])
defer func() {
if commandPid > 0 {
// Just in case.
syscall.Kill(commandPid, 9)
}
}()
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
if isTerminal {
c := make(chan os.Signal, 1)
handledSignals := append(append(terminatingSignals, syscall.SIGWINCH), syscall.SIGCONT)
signal.Notify(c, handledSignals...)
go func() {
for sig := range c {
if sig == syscall.SIGCONT {
syscall.Kill(commandPid, syscall.SIGCONT)
} else if sig == syscall.SIGWINCH {
ttyutils.MirrorWinsize(output, master)
syscall.Kill(commandPid, syscall.SIGWINCH)
} else { // member of terminatingSignals
ttyutils.RestoreTerminalState(output.Fd(), oldState)
print("\r")
syscall.Kill(commandPid, sig.(syscall.Signal))
os.Exit(1)
}
}
}()
}
var exitStatus int = -1
if len(parts) > 2 {
exitStatus, err = strconv.Atoi(parts[0])
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
}
eof := make(chan bool)
go func() {
for {
buf := make([]byte, 1024)
n, err := master.Read(buf)
if err == nil || (err == io.EOF && n > 0) {
output.Write(buf[:n])
} else {
eof <- true
break
}
}
}()
go func() {
buf := make([]byte, 8192)
for {
n, err := input.Read(buf)
if err != nil {
eof <- true
break
}
if isTerminal {
for i := 0; i < n; i++ {
switch buf[i] {
case sigInt:
syscall.Kill(commandPid, syscall.SIGINT)
case sigQuit:
syscall.Kill(commandPid, syscall.SIGQUIT)
case sigTstp:
syscall.Kill(commandPid, syscall.SIGTSTP)
syscall.Kill(os.Getpid(), syscall.SIGTSTP)
}
}
}
master.Write(buf[:n])
}
}()
<-eof
if exitStatus == -1 {
msg, err = usock.ReadMessage()
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
parts := strings.Split(msg, "\000")
exitStatus, err = strconv.Atoi(parts[0])
if err != nil {
slog.ErrorString(err.Error() + "\r")
return 1
}
}
return exitStatus
}