func RunExternalDump(cmd, wd string, argv []string, dump io.Writer) (err os.Error) {
var p *exec.Cmd
p, err = exec.Run(cmd, argv, nil, wd, exec.PassThrough, exec.Pipe, exec.PassThrough)
if err != nil {
return
}
if p != nil {
src := p.Stdout
buffer := make([]byte, 1024)
for {
n, cpErr := src.Read(buffer)
if cpErr != nil {
break
}
_, cpErr = dump.Write(buffer[0:n])
if cpErr != nil {
break
}
}
var wmsg *os.Waitmsg
wmsg, err = p.Wait(0)
if wmsg.ExitStatus() != 0 {
err = os.NewError(fmt.Sprintf("%v: %s\n", argv, wmsg.String()))
return
}
if err != nil {
return
}
}
return
}
func exitedCleanly(w *os.Waitmsg) bool {
return w.Exited() && w.ExitStatus() == 0
}