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create.go
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create.go
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// +build linux,cgo
package native
import (
"fmt"
"strings"
"syscall"
"github.com/docker/docker/daemon/execdriver"
"github.com/opencontainers/runc/libcontainer/apparmor"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/devices"
)
// createContainer populates and configures the container type with the
// data provided by the execdriver.Command
func (d *Driver) createContainer(c *execdriver.Command, hooks execdriver.Hooks) (*configs.Config, error) {
container := execdriver.InitContainer(c)
if err := d.createIpc(container, c); err != nil {
return nil, err
}
if err := d.createPid(container, c); err != nil {
return nil, err
}
if err := d.createUTS(container, c); err != nil {
return nil, err
}
if err := d.setupRemappedRoot(container, c); err != nil {
return nil, err
}
if err := d.createNetwork(container, c, hooks); err != nil {
return nil, err
}
if c.ProcessConfig.Privileged {
if !container.Readonlyfs {
// clear readonly for /sys
for i := range container.Mounts {
if container.Mounts[i].Destination == "/sys" {
container.Mounts[i].Flags &= ^syscall.MS_RDONLY
}
}
container.ReadonlyPaths = nil
}
// clear readonly for cgroup
for i := range container.Mounts {
if container.Mounts[i].Device == "cgroup" {
container.Mounts[i].Flags &= ^syscall.MS_RDONLY
}
}
container.MaskPaths = nil
if err := d.setPrivileged(container); err != nil {
return nil, err
}
} else {
if err := d.setCapabilities(container, c); err != nil {
return nil, err
}
}
// add CAP_ prefix to all caps for new libcontainer update to match
// the spec format.
for i, s := range container.Capabilities {
if !strings.HasPrefix(s, "CAP_") {
container.Capabilities[i] = fmt.Sprintf("CAP_%s", s)
}
}
container.AdditionalGroups = c.GroupAdd
if c.AppArmorProfile != "" {
container.AppArmorProfile = c.AppArmorProfile
}
if err := execdriver.SetupCgroups(container, c); err != nil {
return nil, err
}
if container.Readonlyfs {
for i := range container.Mounts {
switch container.Mounts[i].Destination {
case "/proc", "/dev", "/dev/pts":
continue
}
container.Mounts[i].Flags |= syscall.MS_RDONLY
}
/* These paths must be remounted as r/o */
container.ReadonlyPaths = append(container.ReadonlyPaths, "/dev")
}
if err := d.setupMounts(container, c); err != nil {
return nil, err
}
d.setupLabels(container, c)
d.setupRlimits(container, c)
return container, nil
}
func (d *Driver) createNetwork(container *configs.Config, c *execdriver.Command, hooks execdriver.Hooks) error {
if c.Network == nil {
return nil
}
if c.Network.ContainerID != "" {
d.Lock()
active := d.activeContainers[c.Network.ContainerID]
d.Unlock()
if active == nil {
return fmt.Errorf("%s is not a valid running container to join", c.Network.ContainerID)
}
state, err := active.State()
if err != nil {
return err
}
container.Namespaces.Add(configs.NEWNET, state.NamespacePaths[configs.NEWNET])
return nil
}
if c.Network.NamespacePath != "" {
container.Namespaces.Add(configs.NEWNET, c.Network.NamespacePath)
return nil
}
// only set up prestart hook if the namespace path is not set (this should be
// all cases *except* for --net=host shared networking)
container.Hooks = &configs.Hooks{
Prestart: []configs.Hook{
configs.NewFunctionHook(func(s configs.HookState) error {
if len(hooks.PreStart) > 0 {
for _, fnHook := range hooks.PreStart {
// A closed channel for OOM is returned here as it will be
// non-blocking and return the correct result when read.
chOOM := make(chan struct{})
close(chOOM)
if err := fnHook(&c.ProcessConfig, s.Pid, chOOM); err != nil {
return err
}
}
}
return nil
}),
},
}
return nil
}
func (d *Driver) createIpc(container *configs.Config, c *execdriver.Command) error {
if c.Ipc.HostIpc {
container.Namespaces.Remove(configs.NEWIPC)
return nil
}
if c.Ipc.ContainerID != "" {
d.Lock()
active := d.activeContainers[c.Ipc.ContainerID]
d.Unlock()
if active == nil {
return fmt.Errorf("%s is not a valid running container to join", c.Ipc.ContainerID)
}
state, err := active.State()
if err != nil {
return err
}
container.Namespaces.Add(configs.NEWIPC, state.NamespacePaths[configs.NEWIPC])
}
return nil
}
func (d *Driver) createPid(container *configs.Config, c *execdriver.Command) error {
if c.Pid.HostPid {
container.Namespaces.Remove(configs.NEWPID)
return nil
}
return nil
}
func (d *Driver) createUTS(container *configs.Config, c *execdriver.Command) error {
if c.UTS.HostUTS {
container.Namespaces.Remove(configs.NEWUTS)
container.Hostname = ""
return nil
}
return nil
}
func (d *Driver) setupRemappedRoot(container *configs.Config, c *execdriver.Command) error {
if c.RemappedRoot.UID == 0 {
container.Namespaces.Remove(configs.NEWUSER)
return nil
}
// convert the Docker daemon id map to the libcontainer variant of the same struct
// this keeps us from having to import libcontainer code across Docker client + daemon packages
cuidMaps := []configs.IDMap{}
cgidMaps := []configs.IDMap{}
for _, idMap := range c.UIDMapping {
cuidMaps = append(cuidMaps, configs.IDMap(idMap))
}
for _, idMap := range c.GIDMapping {
cgidMaps = append(cgidMaps, configs.IDMap(idMap))
}
container.UidMappings = cuidMaps
container.GidMappings = cgidMaps
for _, node := range container.Devices {
node.Uid = uint32(c.RemappedRoot.UID)
node.Gid = uint32(c.RemappedRoot.GID)
}
// TODO: until a kernel/mount solution exists for handling remount in a user namespace,
// we must clear the readonly flag for the cgroups mount (@mrunalp concurs)
for i := range container.Mounts {
if container.Mounts[i].Device == "cgroup" {
container.Mounts[i].Flags &= ^syscall.MS_RDONLY
}
}
return nil
}
func (d *Driver) setPrivileged(container *configs.Config) (err error) {
container.Capabilities = execdriver.GetAllCapabilities()
container.Cgroups.AllowAllDevices = true
hostDevices, err := devices.HostDevices()
if err != nil {
return err
}
container.Devices = hostDevices
if apparmor.IsEnabled() {
container.AppArmorProfile = "unconfined"
}
return nil
}
func (d *Driver) setCapabilities(container *configs.Config, c *execdriver.Command) (err error) {
container.Capabilities, err = execdriver.TweakCapabilities(container.Capabilities, c.CapAdd, c.CapDrop)
return err
}
func (d *Driver) setupRlimits(container *configs.Config, c *execdriver.Command) {
if c.Resources == nil {
return
}
for _, rlimit := range c.Resources.Rlimits {
container.Rlimits = append(container.Rlimits, configs.Rlimit{
Type: rlimit.Type,
Hard: rlimit.Hard,
Soft: rlimit.Soft,
})
}
}
func (d *Driver) setupMounts(container *configs.Config, c *execdriver.Command) error {
userMounts := make(map[string]struct{})
for _, m := range c.Mounts {
userMounts[m.Destination] = struct{}{}
}
// Filter out mounts that are overriden by user supplied mounts
var defaultMounts []*configs.Mount
_, mountDev := userMounts["/dev"]
for _, m := range container.Mounts {
if _, ok := userMounts[m.Destination]; !ok {
if mountDev && strings.HasPrefix(m.Destination, "/dev/") {
continue
}
defaultMounts = append(defaultMounts, m)
}
}
container.Mounts = defaultMounts
for _, m := range c.Mounts {
flags := syscall.MS_BIND | syscall.MS_REC
if !m.Writable {
flags |= syscall.MS_RDONLY
}
if m.Slave {
flags |= syscall.MS_SLAVE
}
container.Mounts = append(container.Mounts, &configs.Mount{
Source: m.Source,
Destination: m.Destination,
Device: "bind",
Flags: flags,
})
}
return nil
}
func (d *Driver) setupLabels(container *configs.Config, c *execdriver.Command) {
container.ProcessLabel = c.ProcessLabel
container.MountLabel = c.MountLabel
}