func (remote RemoteSnapshotsLoc) SendSnapshot(snapshot Snapshot, parent Timestamp) (err error) {
var sendCmd *exec.Cmd
if parent == "" {
if verbosity > 1 {
log.Println("Performing full send/receive")
}
sendCmd = exec.Command(btrfsBin, "send", snapshot.Path())
} else {
if verbosity > 1 {
log.Println("Performing incremental send/receive")
}
parentPath := path.Join(path.Dir(snapshot.Path()), string(parent))
sendCmd = exec.Command(btrfsBin, "send", "-p", parentPath, snapshot.Path())
}
if verbosity > 1 {
sendCmd.Stderr = os.Stderr
}
sendRd, sendWr := io.Pipe()
defer sendRd.Close()
var recvRunner CmdRunner
var compOut *snappy.Writer
closeComp := false
if remote.Host == "" {
sendCmd.Stdout = sendWr
recvRunner = remote.SnapshotsLoc.ReceiveAndCleanUp(sendRd, snapshot.timestamp)
} else {
if *noCompressionFlag {
sendCmd.Stdout = sendWr
recvRunner = remote.RemoteReceive(sendRd, snapshot.timestamp)
} else {
compOut = snappy.NewBufferedWriter(sendWr)
closeComp = true
sendCmd.Stdout = compOut
recvRunner = remote.RemoteReceive(sendRd, snapshot.timestamp)
}
}
sendRunner := RunCommand(sendCmd)
err = <-recvRunner.Started
if err != nil {
log.Println("Error starting btrfs receive")
return
}
if verbosity > 1 {
printCommand(sendCmd)
}
err = <-sendRunner.Started
if err != nil {
log.Println("Error starting btrfs send")
return
}
select {
case err = <-sendRunner.Done:
if err != nil {
log.Println("Error running btrfs send")
}
if closeComp {
compOut.Close()
}
sendWr.Close()
<-recvRunner.Done
return
case err = <-recvRunner.Done:
if err != nil {
log.Println("Error running btrfs receive")
}
sendRunner.Signal <- os.Kill
<-sendRunner.Done
return
}
}
