+ prefix = ["/usr/bin/eatmydata"] if os.path.exists('/usr/bin/eatmydata') else []
+ # nothing else does the fsync stuff, so why do it here?
+ Fdb = subprocess.Popen(prefix + ["cdbmake", File, "%s.tmp" % File],
+ preexec_fn=lambda: os.umask(0022),
+ stdin=subprocess.PIPE)