c.Check(err, check.IsNil)
fi, err := os.Stat(tmpdir + "/arvados-server-easy_1.2.3~rc4_amd64.deb")
c.Assert(err, check.IsNil)
c.Logf("%#v", fi)
c.Check(err, check.IsNil)
fi, err := os.Stat(tmpdir + "/arvados-server-easy_1.2.3~rc4_amd64.deb")
c.Assert(err, check.IsNil)
c.Logf("%#v", fi)