Describe("MakeNetworkNS", func() {
It("should return the filepath to a network namespace", func() {
containerID := fmt.Sprintf("c-%x", rand.Int31())
nsPath := testhelpers.MakeNetworkNS(containerID)
Expect(nsPath).To(BeAnExistingFile())
testhelpers.RemoveNetworkNS(containerID)
})
It("should return a network namespace different from that of the caller", func() {
containerID := fmt.Sprintf("c-%x", rand.Int31())
By("discovering the inode of the current netns")
originalNetNSPath := currentNetNSPath()
originalNetNSInode, err := testhelpers.GetInode(originalNetNSPath)
Expect(err).NotTo(HaveOccurred())
By("creating a new netns")
createdNetNSPath := testhelpers.MakeNetworkNS(containerID)
defer testhelpers.RemoveNetworkNS(createdNetNSPath)
By("discovering the inode of the created netns")
createdNetNSInode, err := testhelpers.GetInode(createdNetNSPath)
Expect(err).NotTo(HaveOccurred())
By("comparing the inodes")
Expect(createdNetNSInode).NotTo(Equal(originalNetNSInode))
})
It("should not leak the new netns onto any threads in the process", func() {
Expect(err).NotTo(HaveOccurred())
targetNetNSPath = filepath.Join("/var/run/netns/", targetNetNSName)
targetNetNS, err = os.Open(targetNetNSPath)
Expect(err).NotTo(HaveOccurred())
})
AfterEach(func() {
Expect(targetNetNS.Close()).To(Succeed())
err := exec.Command("ip", "netns", "del", targetNetNSName).Run()
Expect(err).NotTo(HaveOccurred())
})
It("executes the callback within the target network namespace", func() {
expectedInode, err := testhelpers.GetInode(targetNetNSPath)
Expect(err).NotTo(HaveOccurred())
var actualInode uint64
var innerErr error
err = ns.WithNetNS(targetNetNS, false, func(*os.File) error {
actualInode, innerErr = testhelpers.GetInodeCurNetNS()
return nil
})
Expect(err).NotTo(HaveOccurred())
Expect(innerErr).NotTo(HaveOccurred())
Expect(actualInode).To(Equal(expectedInode))
})
It("provides the original namespace as the argument to the callback", func() {