package main import ( "fmt" "strings" "time" "github.com/go-check/check" ) func (s *DockerSuite) BenchmarkLogsCLIRotateFollow(c *testing.B) { out, _ := dockerCmd(c, "run", "-d", "--log-opt", "max-size=1b", "--log-opt", "max-file=10", "busybox", "sh", "-c", "while true; do usleep 50000; echo hello; done") id := strings.TrimSpace(out) ch := make(chan error, 1) go func() { ch <- nil out, _, _ := dockerCmdWithError("logs", "-f", id) // if this returns at all, it's an error ch <- fmt.Errorf(out) }() <-ch select { case <-time.After(30 * time.Second): // ran for 30 seconds with no problem return case err := <-ch: if err != nil { c.Fatal(err) } } }