session, err := gexec.Start(exec.Command("sh", "-c", fmt.Sprintf("ip netns exec gdnsetnstest ifconfig %s", name)), GinkgoWriter, GinkgoWriter)
Expect(err).ToNot(HaveOccurred())
Eventually(session, "5s").Should(gexec.Exit(0))
})
Context("when the interface does not exist", func() {
It("returns the error", func() {
Expect(l.SetNs(&net.Interface{Name: "something"}, 1234)).To(MatchError("devices: Link not found"))
})
})
})
Describe("InterfaceByName", func() {
Context("when the interface exists", func() {
It("returns the interface with the given name, and true", func() {
returnedIntf, found, err := l.InterfaceByName(name)
Expect(err).ToNot(HaveOccurred())
Expect(returnedIntf).To(Equal(intf))
Expect(found).To(BeTrue())
})
})
Context("when the interface does not exist", func() {
It("does not return an error", func() {
_, found, err := l.InterfaceByName("sandwich")
Expect(err).ToNot(HaveOccurred())
Expect(found).To(BeFalse())
})
})
})
func init() {
reexec.Register("configure-container-netns", func() {
var netNsPath, containerIntf, containerIPStr, bridgeIPStr, subnetStr string
var mtu int
flag.StringVar(&netNsPath, "netNsPath", "", "netNsPath")
flag.StringVar(&containerIntf, "containerIntf", "", "containerIntf")
flag.StringVar(&containerIPStr, "containerIP", "", "containerIP")
flag.StringVar(&bridgeIPStr, "bridgeIP", "", "bridgeIP")
flag.StringVar(&subnetStr, "subnet", "", "subnet")
flag.IntVar(&mtu, "mtu", 0, "mtu")
flag.Parse()
fd, err := os.Open(netNsPath)
if err != nil {
fmt.Fprintf(os.Stderr, "opening netns `%s`: %s", netNsPath, err)
os.Exit(1)
}
defer fd.Close()
netNsExecer := &netns.Execer{}
if err = netNsExecer.Exec(fd, func() error {
containerIP := net.ParseIP(containerIPStr)
bridgeIP := net.ParseIP(bridgeIPStr)
_, subnetIPNet, err := net.ParseCIDR(subnetStr)
if err != nil {
panic(err)
}
link := devices.Link{}
intf, found, err := link.InterfaceByName(containerIntf)
if err != nil {
panic(err)
}
if !found {
return fmt.Errorf("interface `%s` was not found", containerIntf)
}
if err := link.AddIP(intf, containerIP, subnetIPNet); err != nil {
panic(err)
}
if err := link.SetUp(intf); err != nil {
panic(err)
}
if err := link.AddDefaultGW(intf, bridgeIP); err != nil {
panic(err)
}
if err := link.SetMTU(intf, mtu); err != nil {
panic(err)
}
return nil
}); err != nil {
fmt.Fprintf(os.Stderr, err.Error())
os.Exit(1)
}
})
}