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Without this code a second start will crash: ``` $ ./bin/etcd -name foobar --data-dir=foobar 2015/03/18 18:06:28 starter: detect etcd version 2.0.1 in foobar 2015/03/18 18:06:28 starter: unhandled etcd version in foobar panic: starter: unhandled etcd version in foobar goroutine 1 [running]: log.Panicf(0x594770, 0x25, 0x208927c70, 0x1, 0x1) /usr/local/go/src/log/log.go:314 +0xd0 github.com/coreos/etcd/migrate/starter.checkInternalVersion(0x20889a480, 0x0, 0x0) /Users/philips/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/migrate/starter/starter.go:160 +0xf2f github.com/coreos/etcd/migrate/starter.StartDesiredVersion(0x20884a010, 0x3, 0x3) /Users/philips/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/migrate/starter/starter.go:77 +0x2a9 main.main() /Users/philips/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/main.go:46 +0x25e goroutine 9 [syscall]: os/signal.loop() /usr/local/go/src/os/signal/signal_unix.go:21 +0x1f created by os/signal.init·1 /usr/local/go/src/os/signal/signal_unix.go:27 +0x35 ```