func makeNetworkNS(containerID string) string {
namespace := "/var/run/netns/" + containerID
pid := unix.Getpid()
tid := unix.Gettid()
err := os.MkdirAll("/var/run/netns", 0600)
Expect(err).NotTo(HaveOccurred())
runtime.LockOSThread()
defer runtime.UnlockOSThread()
go (func() {
defer GinkgoRecover()
err = unix.Unshare(unix.CLONE_NEWNET)
Expect(err).NotTo(HaveOccurred())
fd, err := os.Create(namespace)
Expect(err).NotTo(HaveOccurred())
defer fd.Close()
err = unix.Mount("/proc/self/ns/net", namespace, "none", unix.MS_BIND, "")
Expect(err).NotTo(HaveOccurred())
})()
Eventually(namespace).Should(BeAnExistingFile())
fd, err := unix.Open(fmt.Sprintf("/proc/%d/task/%d/ns/net", pid, tid), unix.O_RDONLY, 0)
Expect(err).NotTo(HaveOccurred())
defer unix.Close(fd)
_, _, e1 := unix.Syscall(unix.SYS_SETNS, uintptr(fd), uintptr(unix.CLONE_NEWNET), 0)
Expect(e1).To(BeZero())
return namespace
}
func currentNetNSPath() string {
pid := unix.Getpid()
tid := unix.Gettid()
return fmt.Sprintf("/proc/%d/task/%d/ns/net", pid, tid)
}
func getCurrentThreadNetNSPath() string {
// /proc/self/ns/net returns the namespace of the main thread, not
// of whatever thread this goroutine is running on. Make sure we
// use the thread's net namespace since the thread is switching around
return fmt.Sprintf("/proc/%d/task/%d/ns/net", os.Getpid(), unix.Gettid())
}
