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moby--moby/daemon/container_linux.go
Madhu Venugopal 083300168f Vendoring in libnetwork to 3be488927db8d719568917203deddd630a194564
This PR brings the vendored libnetwork code to
3be488927db8d719568917203deddd630a194564, which pulls in quite a few
fixes to support kvstore, windows daemon compilation fixes,
multi-network support for Bridge driver, etc...

Signed-off-by: Madhu Venugopal <madhu@docker.com>
2015-06-12 16:10:40 -07:00

1001 lines
27 KiB
Go

// +build linux
package daemon
import (
"fmt"
"io/ioutil"
"net"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/execdriver"
"github.com/docker/docker/daemon/network"
"github.com/docker/docker/links"
"github.com/docker/docker/nat"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/docker/pkg/ulimit"
"github.com/docker/docker/runconfig"
"github.com/docker/docker/utils"
"github.com/docker/libcontainer/configs"
"github.com/docker/libcontainer/devices"
"github.com/docker/libnetwork"
"github.com/docker/libnetwork/netlabel"
"github.com/docker/libnetwork/options"
"github.com/docker/libnetwork/types"
)
const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
type Container struct {
CommonContainer
// Fields below here are platform specific.
AppArmorProfile string
activeLinks map[string]*links.Link
}
func killProcessDirectly(container *Container) error {
if _, err := container.WaitStop(10 * time.Second); err != nil {
// Ensure that we don't kill ourselves
if pid := container.GetPid(); pid != 0 {
logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(container.ID))
if err := syscall.Kill(pid, 9); err != nil {
if err != syscall.ESRCH {
return err
}
logrus.Debugf("Cannot kill process (pid=%d) with signal 9: no such process.", pid)
}
}
}
return nil
}
func (container *Container) setupLinkedContainers() ([]string, error) {
var (
env []string
daemon = container.daemon
)
children, err := daemon.Children(container.Name)
if err != nil {
return nil, err
}
if len(children) > 0 {
container.activeLinks = make(map[string]*links.Link, len(children))
// If we encounter an error make sure that we rollback any network
// config and iptables changes
rollback := func() {
for _, link := range container.activeLinks {
link.Disable()
}
container.activeLinks = nil
}
for linkAlias, child := range children {
if !child.IsRunning() {
return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
}
link, err := links.NewLink(
container.NetworkSettings.IPAddress,
child.NetworkSettings.IPAddress,
linkAlias,
child.Config.Env,
child.Config.ExposedPorts,
)
if err != nil {
rollback()
return nil, err
}
container.activeLinks[link.Alias()] = link
if err := link.Enable(); err != nil {
rollback()
return nil, err
}
for _, envVar := range link.ToEnv() {
env = append(env, envVar)
}
}
}
return env, nil
}
func (container *Container) createDaemonEnvironment(linkedEnv []string) []string {
// if a domain name was specified, append it to the hostname (see #7851)
fullHostname := container.Config.Hostname
if container.Config.Domainname != "" {
fullHostname = fmt.Sprintf("%s.%s", fullHostname, container.Config.Domainname)
}
// Setup environment
env := []string{
"PATH=" + DefaultPathEnv,
"HOSTNAME=" + fullHostname,
// Note: we don't set HOME here because it'll get autoset intelligently
// based on the value of USER inside dockerinit, but only if it isn't
// set already (ie, that can be overridden by setting HOME via -e or ENV
// in a Dockerfile).
}
if container.Config.Tty {
env = append(env, "TERM=xterm")
}
env = append(env, linkedEnv...)
// because the env on the container can override certain default values
// we need to replace the 'env' keys where they match and append anything
// else.
env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env)
return env
}
func getDevicesFromPath(deviceMapping runconfig.DeviceMapping) (devs []*configs.Device, err error) {
device, err := devices.DeviceFromPath(deviceMapping.PathOnHost, deviceMapping.CgroupPermissions)
// if there was no error, return the device
if err == nil {
device.Path = deviceMapping.PathInContainer
return append(devs, device), nil
}
// if the device is not a device node
// try to see if it's a directory holding many devices
if err == devices.ErrNotADevice {
// check if it is a directory
if src, e := os.Stat(deviceMapping.PathOnHost); e == nil && src.IsDir() {
// mount the internal devices recursively
filepath.Walk(deviceMapping.PathOnHost, func(dpath string, f os.FileInfo, e error) error {
childDevice, e := devices.DeviceFromPath(dpath, deviceMapping.CgroupPermissions)
if e != nil {
// ignore the device
return nil
}
// add the device to userSpecified devices
childDevice.Path = strings.Replace(dpath, deviceMapping.PathOnHost, deviceMapping.PathInContainer, 1)
devs = append(devs, childDevice)
return nil
})
}
}
if len(devs) > 0 {
return devs, nil
}
return devs, fmt.Errorf("error gathering device information while adding custom device %q: %s", deviceMapping.PathOnHost, err)
}
func populateCommand(c *Container, env []string) error {
var en *execdriver.Network
if !c.Config.NetworkDisabled {
en = &execdriver.Network{
NamespacePath: c.NetworkSettings.SandboxKey,
}
parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2)
if parts[0] == "container" {
nc, err := c.getNetworkedContainer()
if err != nil {
return err
}
en.ContainerID = nc.ID
}
}
ipc := &execdriver.Ipc{}
if c.hostConfig.IpcMode.IsContainer() {
ic, err := c.getIpcContainer()
if err != nil {
return err
}
ipc.ContainerID = ic.ID
} else {
ipc.HostIpc = c.hostConfig.IpcMode.IsHost()
}
pid := &execdriver.Pid{}
pid.HostPid = c.hostConfig.PidMode.IsHost()
uts := &execdriver.UTS{
HostUTS: c.hostConfig.UTSMode.IsHost(),
}
// Build lists of devices allowed and created within the container.
var userSpecifiedDevices []*configs.Device
for _, deviceMapping := range c.hostConfig.Devices {
devs, err := getDevicesFromPath(deviceMapping)
if err != nil {
return err
}
userSpecifiedDevices = append(userSpecifiedDevices, devs...)
}
allowedDevices := mergeDevices(configs.DefaultAllowedDevices, userSpecifiedDevices)
autoCreatedDevices := mergeDevices(configs.DefaultAutoCreatedDevices, userSpecifiedDevices)
// TODO: this can be removed after lxc-conf is fully deprecated
lxcConfig, err := mergeLxcConfIntoOptions(c.hostConfig)
if err != nil {
return err
}
var rlimits []*ulimit.Rlimit
ulimits := c.hostConfig.Ulimits
// Merge ulimits with daemon defaults
ulIdx := make(map[string]*ulimit.Ulimit)
for _, ul := range ulimits {
ulIdx[ul.Name] = ul
}
for name, ul := range c.daemon.config.Ulimits {
if _, exists := ulIdx[name]; !exists {
ulimits = append(ulimits, ul)
}
}
for _, limit := range ulimits {
rl, err := limit.GetRlimit()
if err != nil {
return err
}
rlimits = append(rlimits, rl)
}
resources := &execdriver.Resources{
Memory: c.hostConfig.Memory,
MemorySwap: c.hostConfig.MemorySwap,
CpuShares: c.hostConfig.CpuShares,
CpusetCpus: c.hostConfig.CpusetCpus,
CpusetMems: c.hostConfig.CpusetMems,
CpuPeriod: c.hostConfig.CpuPeriod,
CpuQuota: c.hostConfig.CpuQuota,
BlkioWeight: c.hostConfig.BlkioWeight,
Rlimits: rlimits,
OomKillDisable: c.hostConfig.OomKillDisable,
}
processConfig := execdriver.ProcessConfig{
Privileged: c.hostConfig.Privileged,
Entrypoint: c.Path,
Arguments: c.Args,
Tty: c.Config.Tty,
User: c.Config.User,
}
processConfig.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
processConfig.Env = env
c.command = &execdriver.Command{
ID: c.ID,
Rootfs: c.RootfsPath(),
ReadonlyRootfs: c.hostConfig.ReadonlyRootfs,
InitPath: "/.dockerinit",
WorkingDir: c.Config.WorkingDir,
Network: en,
Ipc: ipc,
Pid: pid,
UTS: uts,
Resources: resources,
AllowedDevices: allowedDevices,
AutoCreatedDevices: autoCreatedDevices,
CapAdd: c.hostConfig.CapAdd,
CapDrop: c.hostConfig.CapDrop,
ProcessConfig: processConfig,
ProcessLabel: c.GetProcessLabel(),
MountLabel: c.GetMountLabel(),
LxcConfig: lxcConfig,
AppArmorProfile: c.AppArmorProfile,
CgroupParent: c.hostConfig.CgroupParent,
}
return nil
}
func mergeDevices(defaultDevices, userDevices []*configs.Device) []*configs.Device {
if len(userDevices) == 0 {
return defaultDevices
}
paths := map[string]*configs.Device{}
for _, d := range userDevices {
paths[d.Path] = d
}
var devs []*configs.Device
for _, d := range defaultDevices {
if _, defined := paths[d.Path]; !defined {
devs = append(devs, d)
}
}
return append(devs, userDevices...)
}
// GetSize, return real size, virtual size
func (container *Container) GetSize() (int64, int64) {
var (
sizeRw, sizeRootfs int64
err error
driver = container.daemon.driver
)
if err := container.Mount(); err != nil {
logrus.Errorf("Failed to compute size of container rootfs %s: %s", container.ID, err)
return sizeRw, sizeRootfs
}
defer container.Unmount()
initID := fmt.Sprintf("%s-init", container.ID)
sizeRw, err = driver.DiffSize(container.ID, initID)
if err != nil {
logrus.Errorf("Driver %s couldn't return diff size of container %s: %s", driver, container.ID, err)
// FIXME: GetSize should return an error. Not changing it now in case
// there is a side-effect.
sizeRw = -1
}
if _, err = os.Stat(container.basefs); err == nil {
if sizeRootfs, err = directory.Size(container.basefs); err != nil {
sizeRootfs = -1
}
}
return sizeRw, sizeRootfs
}
func (container *Container) buildHostnameFile() error {
hostnamePath, err := container.GetRootResourcePath("hostname")
if err != nil {
return err
}
container.HostnamePath = hostnamePath
if container.Config.Domainname != "" {
return ioutil.WriteFile(container.HostnamePath, []byte(fmt.Sprintf("%s.%s\n", container.Config.Hostname, container.Config.Domainname)), 0644)
}
return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644)
}
func (container *Container) buildJoinOptions() ([]libnetwork.EndpointOption, error) {
var (
joinOptions []libnetwork.EndpointOption
err error
dns []string
dnsSearch []string
)
joinOptions = append(joinOptions, libnetwork.JoinOptionHostname(container.Config.Hostname),
libnetwork.JoinOptionDomainname(container.Config.Domainname))
if container.hostConfig.NetworkMode.IsHost() {
joinOptions = append(joinOptions, libnetwork.JoinOptionUseDefaultSandbox())
}
container.HostsPath, err = container.GetRootResourcePath("hosts")
if err != nil {
return nil, err
}
joinOptions = append(joinOptions, libnetwork.JoinOptionHostsPath(container.HostsPath))
container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
if err != nil {
return nil, err
}
joinOptions = append(joinOptions, libnetwork.JoinOptionResolvConfPath(container.ResolvConfPath))
if len(container.hostConfig.Dns) > 0 {
dns = container.hostConfig.Dns
} else if len(container.daemon.config.Dns) > 0 {
dns = container.daemon.config.Dns
}
for _, d := range dns {
joinOptions = append(joinOptions, libnetwork.JoinOptionDNS(d))
}
if len(container.hostConfig.DnsSearch) > 0 {
dnsSearch = container.hostConfig.DnsSearch
} else if len(container.daemon.config.DnsSearch) > 0 {
dnsSearch = container.daemon.config.DnsSearch
}
for _, ds := range dnsSearch {
joinOptions = append(joinOptions, libnetwork.JoinOptionDNSSearch(ds))
}
if container.NetworkSettings.SecondaryIPAddresses != nil {
name := container.Config.Hostname
if container.Config.Domainname != "" {
name = name + "." + container.Config.Domainname
}
for _, a := range container.NetworkSettings.SecondaryIPAddresses {
joinOptions = append(joinOptions, libnetwork.JoinOptionExtraHost(name, a.Addr))
}
}
var childEndpoints, parentEndpoints []string
children, err := container.daemon.Children(container.Name)
if err != nil {
return nil, err
}
for linkAlias, child := range children {
_, alias := path.Split(linkAlias)
// allow access to the linked container via the alias, real name, and container hostname
aliasList := alias + " " + child.Config.Hostname
// only add the name if alias isn't equal to the name
if alias != child.Name[1:] {
aliasList = aliasList + " " + child.Name[1:]
}
joinOptions = append(joinOptions, libnetwork.JoinOptionExtraHost(aliasList, child.NetworkSettings.IPAddress))
if child.NetworkSettings.EndpointID != "" {
childEndpoints = append(childEndpoints, child.NetworkSettings.EndpointID)
}
}
for _, extraHost := range container.hostConfig.ExtraHosts {
// allow IPv6 addresses in extra hosts; only split on first ":"
parts := strings.SplitN(extraHost, ":", 2)
joinOptions = append(joinOptions, libnetwork.JoinOptionExtraHost(parts[0], parts[1]))
}
refs := container.daemon.ContainerGraph().RefPaths(container.ID)
for _, ref := range refs {
if ref.ParentID == "0" {
continue
}
c, err := container.daemon.Get(ref.ParentID)
if err != nil {
logrus.Error(err)
}
if c != nil && !container.daemon.config.DisableNetwork && container.hostConfig.NetworkMode.IsPrivate() {
logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", c.ID, ref.Name, container.NetworkSettings.IPAddress)
joinOptions = append(joinOptions, libnetwork.JoinOptionParentUpdate(c.NetworkSettings.EndpointID, ref.Name, container.NetworkSettings.IPAddress))
if c.NetworkSettings.EndpointID != "" {
parentEndpoints = append(parentEndpoints, c.NetworkSettings.EndpointID)
}
}
}
linkOptions := options.Generic{
netlabel.GenericData: options.Generic{
"ParentEndpoints": parentEndpoints,
"ChildEndpoints": childEndpoints,
},
}
joinOptions = append(joinOptions, libnetwork.JoinOptionGeneric(linkOptions))
return joinOptions, nil
}
func (container *Container) buildPortMapInfo(n libnetwork.Network, ep libnetwork.Endpoint, networkSettings *network.Settings) (*network.Settings, error) {
if ep == nil {
return nil, fmt.Errorf("invalid endpoint while building port map info")
}
if networkSettings == nil {
return nil, fmt.Errorf("invalid networksettings while building port map info")
}
driverInfo, err := ep.DriverInfo()
if err != nil {
return nil, err
}
if driverInfo == nil {
// It is not an error for epInfo to be nil
return networkSettings, nil
}
if mac, ok := driverInfo[netlabel.MacAddress]; ok {
networkSettings.MacAddress = mac.(net.HardwareAddr).String()
}
networkSettings.Ports = nat.PortMap{}
if expData, ok := driverInfo[netlabel.ExposedPorts]; ok {
if exposedPorts, ok := expData.([]types.TransportPort); ok {
for _, tp := range exposedPorts {
natPort := nat.NewPort(tp.Proto.String(), strconv.Itoa(int(tp.Port)))
networkSettings.Ports[natPort] = nil
}
}
}
mapData, ok := driverInfo[netlabel.PortMap]
if !ok {
return networkSettings, nil
}
if portMapping, ok := mapData.([]types.PortBinding); ok {
for _, pp := range portMapping {
natPort := nat.NewPort(pp.Proto.String(), strconv.Itoa(int(pp.Port)))
natBndg := nat.PortBinding{HostIp: pp.HostIP.String(), HostPort: strconv.Itoa(int(pp.HostPort))}
networkSettings.Ports[natPort] = append(networkSettings.Ports[natPort], natBndg)
}
}
return networkSettings, nil
}
func (container *Container) buildEndpointInfo(n libnetwork.Network, ep libnetwork.Endpoint, networkSettings *network.Settings) (*network.Settings, error) {
if ep == nil {
return nil, fmt.Errorf("invalid endpoint while building port map info")
}
if networkSettings == nil {
return nil, fmt.Errorf("invalid networksettings while building port map info")
}
epInfo := ep.Info()
if epInfo == nil {
// It is not an error to get an empty endpoint info
return networkSettings, nil
}
ifaceList := epInfo.InterfaceList()
if len(ifaceList) == 0 {
return networkSettings, nil
}
iface := ifaceList[0]
ones, _ := iface.Address().Mask.Size()
networkSettings.IPAddress = iface.Address().IP.String()
networkSettings.IPPrefixLen = ones
if iface.AddressIPv6().IP.To16() != nil {
onesv6, _ := iface.AddressIPv6().Mask.Size()
networkSettings.GlobalIPv6Address = iface.AddressIPv6().IP.String()
networkSettings.GlobalIPv6PrefixLen = onesv6
}
if len(ifaceList) == 1 {
return networkSettings, nil
}
networkSettings.SecondaryIPAddresses = make([]network.Address, 0, len(ifaceList)-1)
networkSettings.SecondaryIPv6Addresses = make([]network.Address, 0, len(ifaceList)-1)
for _, iface := range ifaceList[1:] {
ones, _ := iface.Address().Mask.Size()
addr := network.Address{Addr: iface.Address().IP.String(), PrefixLen: ones}
networkSettings.SecondaryIPAddresses = append(networkSettings.SecondaryIPAddresses, addr)
if iface.AddressIPv6().IP.To16() != nil {
onesv6, _ := iface.AddressIPv6().Mask.Size()
addrv6 := network.Address{Addr: iface.AddressIPv6().IP.String(), PrefixLen: onesv6}
networkSettings.SecondaryIPv6Addresses = append(networkSettings.SecondaryIPv6Addresses, addrv6)
}
}
return networkSettings, nil
}
func (container *Container) updateJoinInfo(ep libnetwork.Endpoint) error {
epInfo := ep.Info()
if epInfo == nil {
// It is not an error to get an empty endpoint info
return nil
}
container.NetworkSettings.Gateway = epInfo.Gateway().String()
if epInfo.GatewayIPv6().To16() != nil {
container.NetworkSettings.IPv6Gateway = epInfo.GatewayIPv6().String()
}
container.NetworkSettings.SandboxKey = epInfo.SandboxKey()
return nil
}
func (container *Container) updateNetworkSettings(n libnetwork.Network, ep libnetwork.Endpoint) error {
networkSettings := &network.Settings{NetworkID: n.ID(), EndpointID: ep.ID()}
networkSettings, err := container.buildPortMapInfo(n, ep, networkSettings)
if err != nil {
return err
}
networkSettings, err = container.buildEndpointInfo(n, ep, networkSettings)
if err != nil {
return err
}
if container.hostConfig.NetworkMode == runconfig.NetworkMode("bridge") {
networkSettings.Bridge = container.daemon.config.Bridge.Iface
}
container.NetworkSettings = networkSettings
return nil
}
func (container *Container) UpdateNetwork() error {
n, err := container.daemon.netController.NetworkByID(container.NetworkSettings.NetworkID)
if err != nil {
return fmt.Errorf("error locating network id %s: %v", container.NetworkSettings.NetworkID, err)
}
ep, err := n.EndpointByID(container.NetworkSettings.EndpointID)
if err != nil {
return fmt.Errorf("error locating endpoint id %s: %v", container.NetworkSettings.EndpointID, err)
}
if err := ep.Leave(container.ID); err != nil {
return fmt.Errorf("endpoint leave failed: %v", err)
}
joinOptions, err := container.buildJoinOptions()
if err != nil {
return fmt.Errorf("Update network failed: %v", err)
}
if err := ep.Join(container.ID, joinOptions...); err != nil {
return fmt.Errorf("endpoint join failed: %v", err)
}
if err := container.updateJoinInfo(ep); err != nil {
return fmt.Errorf("Updating join info failed: %v", err)
}
return nil
}
func (container *Container) buildCreateEndpointOptions() ([]libnetwork.EndpointOption, error) {
var (
portSpecs = make(nat.PortSet)
bindings = make(nat.PortMap)
pbList []types.PortBinding
exposeList []types.TransportPort
createOptions []libnetwork.EndpointOption
)
if container.Config.ExposedPorts != nil {
portSpecs = container.Config.ExposedPorts
}
if container.hostConfig.PortBindings != nil {
for p, b := range container.hostConfig.PortBindings {
bindings[p] = []nat.PortBinding{}
for _, bb := range b {
bindings[p] = append(bindings[p], nat.PortBinding{
HostIp: bb.HostIp,
HostPort: bb.HostPort,
})
}
}
}
container.NetworkSettings.PortMapping = nil
ports := make([]nat.Port, len(portSpecs))
var i int
for p := range portSpecs {
ports[i] = p
i++
}
nat.SortPortMap(ports, bindings)
for _, port := range ports {
expose := types.TransportPort{}
expose.Proto = types.ParseProtocol(port.Proto())
expose.Port = uint16(port.Int())
exposeList = append(exposeList, expose)
pb := types.PortBinding{Port: expose.Port, Proto: expose.Proto}
binding := bindings[port]
for i := 0; i < len(binding); i++ {
pbCopy := pb.GetCopy()
pbCopy.HostPort = uint16(nat.Port(binding[i].HostPort).Int())
pbCopy.HostIP = net.ParseIP(binding[i].HostIp)
pbList = append(pbList, pbCopy)
}
if container.hostConfig.PublishAllPorts && len(binding) == 0 {
pbList = append(pbList, pb)
}
}
createOptions = append(createOptions,
libnetwork.CreateOptionPortMapping(pbList),
libnetwork.CreateOptionExposedPorts(exposeList))
if container.Config.MacAddress != "" {
mac, err := net.ParseMAC(container.Config.MacAddress)
if err != nil {
return nil, err
}
genericOption := options.Generic{
netlabel.MacAddress: mac,
}
createOptions = append(createOptions, libnetwork.EndpointOptionGeneric(genericOption))
}
return createOptions, nil
}
func (container *Container) AllocateNetwork() error {
mode := container.hostConfig.NetworkMode
if container.Config.NetworkDisabled || mode.IsContainer() {
return nil
}
var err error
n, err := container.daemon.netController.NetworkByName(string(mode))
if err != nil {
return fmt.Errorf("error locating network with name %s: %v", string(mode), err)
}
createOptions, err := container.buildCreateEndpointOptions()
if err != nil {
return err
}
ep, err := n.CreateEndpoint(container.Name, createOptions...)
if err != nil {
return err
}
if err := container.updateNetworkSettings(n, ep); err != nil {
return err
}
joinOptions, err := container.buildJoinOptions()
if err != nil {
return err
}
if err := ep.Join(container.ID, joinOptions...); err != nil {
return err
}
if err := container.updateJoinInfo(ep); err != nil {
return fmt.Errorf("Updating join info failed: %v", err)
}
if err := container.WriteHostConfig(); err != nil {
return err
}
return nil
}
func (container *Container) initializeNetworking() error {
var err error
// Make sure NetworkMode has an acceptable value before
// initializing networking.
if container.hostConfig.NetworkMode == runconfig.NetworkMode("") {
container.hostConfig.NetworkMode = runconfig.NetworkMode("bridge")
}
if container.hostConfig.NetworkMode.IsContainer() {
// we need to get the hosts files from the container to join
nc, err := container.getNetworkedContainer()
if err != nil {
return err
}
container.HostnamePath = nc.HostnamePath
container.HostsPath = nc.HostsPath
container.ResolvConfPath = nc.ResolvConfPath
container.Config.Hostname = nc.Config.Hostname
container.Config.Domainname = nc.Config.Domainname
return nil
}
if container.daemon.config.DisableNetwork {
container.Config.NetworkDisabled = true
}
if container.hostConfig.NetworkMode.IsHost() {
container.Config.Hostname, err = os.Hostname()
if err != nil {
return err
}
parts := strings.SplitN(container.Config.Hostname, ".", 2)
if len(parts) > 1 {
container.Config.Hostname = parts[0]
container.Config.Domainname = parts[1]
}
}
if err := container.AllocateNetwork(); err != nil {
return err
}
return container.buildHostnameFile()
}
func (container *Container) ExportRw() (archive.Archive, error) {
if container.daemon == nil {
return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID)
}
archive, err := container.daemon.Diff(container)
if err != nil {
return nil, err
}
return ioutils.NewReadCloserWrapper(archive, func() error {
err := archive.Close()
return err
}),
nil
}
func (container *Container) getIpcContainer() (*Container, error) {
containerID := container.hostConfig.IpcMode.Container()
c, err := container.daemon.Get(containerID)
if err != nil {
return nil, err
}
if !c.IsRunning() {
return nil, fmt.Errorf("cannot join IPC of a non running container: %s", containerID)
}
return c, nil
}
func (container *Container) setupWorkingDirectory() error {
if container.Config.WorkingDir != "" {
container.Config.WorkingDir = filepath.Clean(container.Config.WorkingDir)
pth, err := container.GetResourcePath(container.Config.WorkingDir)
if err != nil {
return err
}
pthInfo, err := os.Stat(pth)
if err != nil {
if !os.IsNotExist(err) {
return err
}
if err := os.MkdirAll(pth, 0755); err != nil {
return err
}
}
if pthInfo != nil && !pthInfo.IsDir() {
return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir)
}
}
return nil
}
func (container *Container) getNetworkedContainer() (*Container, error) {
parts := strings.SplitN(string(container.hostConfig.NetworkMode), ":", 2)
switch parts[0] {
case "container":
if len(parts) != 2 {
return nil, fmt.Errorf("no container specified to join network")
}
nc, err := container.daemon.Get(parts[1])
if err != nil {
return nil, err
}
if container == nc {
return nil, fmt.Errorf("cannot join own network")
}
if !nc.IsRunning() {
return nil, fmt.Errorf("cannot join network of a non running container: %s", parts[1])
}
return nc, nil
default:
return nil, fmt.Errorf("network mode not set to container")
}
}
func (container *Container) ReleaseNetwork() {
if container.hostConfig.NetworkMode.IsContainer() || container.daemon.config.DisableNetwork {
return
}
// If the container is not attached to any network do not try
// to release network and generate spurious error messages.
if container.NetworkSettings.NetworkID == "" {
return
}
n, err := container.daemon.netController.NetworkByID(container.NetworkSettings.NetworkID)
if err != nil {
logrus.Errorf("error locating network id %s: %v", container.NetworkSettings.NetworkID, err)
return
}
ep, err := n.EndpointByID(container.NetworkSettings.EndpointID)
if err != nil {
logrus.Errorf("error locating endpoint id %s: %v", container.NetworkSettings.EndpointID, err)
return
}
if err := ep.Leave(container.ID); err != nil {
logrus.Errorf("leaving endpoint failed: %v", err)
}
if err := ep.Delete(); err != nil {
logrus.Errorf("deleting endpoint failed: %v", err)
}
container.NetworkSettings = &network.Settings{}
}
func disableAllActiveLinks(container *Container) {
if container.activeLinks != nil {
for _, link := range container.activeLinks {
link.Disable()
}
}
}
func (container *Container) DisableLink(name string) {
if container.activeLinks != nil {
if link, exists := container.activeLinks[name]; exists {
link.Disable()
delete(container.activeLinks, name)
if err := container.UpdateNetwork(); err != nil {
logrus.Debugf("Could not update network to remove link: %v", err)
}
} else {
logrus.Debugf("Could not find active link for %s", name)
}
}
}
func (container *Container) UnmountVolumes(forceSyscall bool) error {
var volumeMounts []mountPoint
for _, mntPoint := range container.MountPoints {
dest, err := container.GetResourcePath(mntPoint.Destination)
if err != nil {
return err
}
volumeMounts = append(volumeMounts, mountPoint{Destination: dest, Volume: mntPoint.Volume})
}
for _, mnt := range container.networkMounts() {
dest, err := container.GetResourcePath(mnt.Destination)
if err != nil {
return err
}
volumeMounts = append(volumeMounts, mountPoint{Destination: dest})
}
for _, volumeMount := range volumeMounts {
if forceSyscall {
syscall.Unmount(volumeMount.Destination, 0)
}
if volumeMount.Volume != nil {
if err := volumeMount.Volume.Unmount(); err != nil {
return err
}
}
}
return nil
}