func serverHasBlob(bs blobserver.Storage, br *blobref.BlobRef) (have bool, err os.Error) {
ch := make(chan blobref.SizedBlobRef, 1)
go func() {
err = bs.Stat(ch, []*blobref.BlobRef{br}, 0)
close(ch)
}()
for _ = range ch {
have = true
}
return
}
