func modify(config *configs.Config, context *cli.Context) {
config.ParentDeathSignal = context.Int("parent-death-signal")
config.Readonlyfs = context.Bool("read-only")
config.Cgroups.CpusetCpus = context.String("cpuset-cpus")
config.Cgroups.CpusetMems = context.String("cpuset-mems")
config.Cgroups.CpuShares = int64(context.Int("cpushares"))
config.Cgroups.Memory = int64(context.Int("memory-limit"))
config.Cgroups.MemorySwap = int64(context.Int("memory-swap"))
config.AppArmorProfile = context.String("apparmor-profile")
config.ProcessLabel = context.String("process-label")
config.MountLabel = context.String("mount-label")
rootfs := context.String("rootfs")
if rootfs != "" {
config.Rootfs = rootfs
}
userns_uid := context.Int("userns-root-uid")
if userns_uid != 0 {
config.Namespaces.Add(configs.NEWUSER, "")
config.UidMappings = []configs.IDMap{
{ContainerID: 0, HostID: userns_uid, Size: 1},
{ContainerID: 1, HostID: 1, Size: userns_uid - 1},
{ContainerID: userns_uid + 1, HostID: userns_uid + 1, Size: math.MaxInt32 - userns_uid},
}
config.GidMappings = []configs.IDMap{
{ContainerID: 0, HostID: userns_uid, Size: 1},
{ContainerID: 1, HostID: 1, Size: userns_uid - 1},
{ContainerID: userns_uid + 1, HostID: userns_uid + 1, Size: math.MaxInt32 - userns_uid},
}
for _, node := range config.Devices {
node.Uid = uint32(userns_uid)
node.Gid = uint32(userns_uid)
}
}
for _, rawBind := range context.StringSlice("bind") {
mount := &configs.Mount{
Device: "bind",
Flags: syscall.MS_BIND | syscall.MS_REC,
}
parts := strings.SplitN(rawBind, ":", 3)
switch len(parts) {
default:
logrus.Fatalf("invalid bind mount %s", rawBind)
case 2:
mount.Source, mount.Destination = parts[0], parts[1]
case 3:
mount.Source, mount.Destination = parts[0], parts[1]
switch parts[2] {
case "ro":
mount.Flags |= syscall.MS_RDONLY
case "rw":
default:
logrus.Fatalf("invalid bind mount mode %s", parts[2])
}
}
config.Mounts = append(config.Mounts, mount)
}
for _, tmpfs := range context.StringSlice("tmpfs") {
config.Mounts = append(config.Mounts, &configs.Mount{
Device: "tmpfs",
Destination: tmpfs,
Flags: syscall.MS_NOEXEC | syscall.MS_NOSUID | syscall.MS_NODEV,
})
}
for flag, value := range map[string]configs.NamespaceType{
"net": configs.NEWNET,
"mnt": configs.NEWNS,
"pid": configs.NEWPID,
"ipc": configs.NEWIPC,
"uts": configs.NEWUTS,
} {
switch v := context.String(flag); v {
case "host":
config.Namespaces.Remove(value)
case "", "private":
if !config.Namespaces.Contains(value) {
config.Namespaces.Add(value, "")
}
if flag == "net" {
config.Networks = []*configs.Network{
{
Type: "loopback",
Address: "127.0.0.1/0",
Gateway: "localhost",
},
}
}
if flag == "uts" {
config.Hostname = context.String("hostname")
}
default:
config.Namespaces.Remove(value)
config.Namespaces.Add(value, v)
}
}
if bridge := context.String("veth-bridge"); bridge != "" {
hostName, err := utils.GenerateRandomName("veth", 7)
if err != nil {
logrus.Fatal(err)
}
network := &configs.Network{
Type: "veth",
Name: "eth0",
Bridge: bridge,
Address: context.String("veth-address"),
Gateway: context.String("veth-gateway"),
Mtu: context.Int("veth-mtu"),
HostInterfaceName: hostName,
}
config.Networks = append(config.Networks, network)
}
}
// TODO(vmarmol): Deprecate over time as old Dockers are phased out.
func ReadConfig(dockerRoot, dockerRun, containerID string) (*configs.Config, error) {
// Try using the new config if it is available.
configPath := configPath(dockerRun, containerID)
if utils.FileExists(configPath) {
out, err := ioutil.ReadFile(configPath)
if err != nil {
return nil, err
}
var state libcontainer.State
err = json.Unmarshal(out, &state)
if err != nil {
glog.Errorf("Unmarshal failure for: \n\n%v\n", string(out))
return nil, err
}
return &state.Config, nil
}
// Fallback to reading the old config which is comprised of the state and config files.
oldConfigPath := oldConfigPath(dockerRoot, containerID)
out, err := ioutil.ReadFile(oldConfigPath)
if err != nil {
glog.Errorf("Unmarshal failure for: \n\n%v\n", string(out))
return nil, err
}
// Try reading the preAPIConfig.
var config preAPIConfig
err = json.Unmarshal(out, &config)
if err != nil {
// Try to parse the old pre-API config. The main difference is that namespaces used to be a map, now it is a slice of structs.
// The JSON marshaler will use the non-nested field before the nested one.
type oldLibcontainerConfig struct {
preAPIConfig
OldNamespaces map[string]bool `json:"namespaces,omitempty"`
}
var oldConfig oldLibcontainerConfig
err2 := json.Unmarshal(out, &oldConfig)
if err2 != nil {
// Use original error.
return nil, err
}
// Translate the old pre-API config into the new config.
config = oldConfig.preAPIConfig
for ns := range oldConfig.OldNamespaces {
config.Namespaces = append(config.Namespaces, configs.Namespace{
Type: configs.NamespaceType(ns),
})
}
}
// Read the old state file as well.
state, err := readState(dockerRoot, containerID)
if err != nil {
return nil, err
}
// Convert preAPIConfig + old state file to Config.
// This only converts some of the fields, the ones we use.
// You may need to add fields if the one you're interested in is not available.
var result configs.Config
result.Cgroups = new(configs.Cgroup)
result.Rootfs = config.RootFs
result.Hostname = config.Hostname
result.Namespaces = config.Namespaces
result.Capabilities = config.Capabilities
for _, net := range config.Networks {
n := &configs.Network{
Name: state.NetworkState.VethChild,
Bridge: net.Bridge,
MacAddress: net.MacAddress,
Address: net.Address,
Gateway: net.Gateway,
IPv6Address: net.IPv6Address,
IPv6Gateway: net.IPv6Gateway,
HostInterfaceName: state.NetworkState.VethHost,
}
result.Networks = append(result.Networks, n)
}
result.Routes = config.Routes
if config.Cgroups != nil {
result.Cgroups = config.Cgroups
}
return &result, nil
}