// orderNamespacePaths sorts namespace paths into a list of paths that we
// can setns in order.
func (c *linuxContainer) orderNamespacePaths(namespaces map[configs.NamespaceType]string) ([]string, error) {
paths := []string{}
nsTypes := []configs.NamespaceType{
configs.NEWIPC,
configs.NEWUTS,
configs.NEWNET,
configs.NEWPID,
configs.NEWNS,
}
// join userns if the init process explicitly requires NEWUSER
if c.config.Namespaces.Contains(configs.NEWUSER) {
nsTypes = append(nsTypes, configs.NEWUSER)
}
for _, nsType := range nsTypes {
if p, ok := namespaces[nsType]; ok && p != "" {
// check if the requested namespace is supported
if !configs.IsNamespaceSupported(nsType) {
return nil, newSystemError(fmt.Errorf("namespace %s is not supported", nsType))
}
// only set to join this namespace if it exists
if _, err := os.Lstat(p); err != nil {
return nil, newSystemErrorWithCausef(err, "running lstat on namespace path %q", p)
}
// do not allow namespace path with comma as we use it to separate
// the namespace paths
if strings.ContainsRune(p, ',') {
return nil, newSystemError(fmt.Errorf("invalid path %s", p))
}
paths = append(paths, p)
}
}
return paths, nil
}
func (c *linuxContainer) currentState() (*State, error) {
var (
startTime string
externalDescriptors []string
pid = -1
)
if c.initProcess != nil {
pid = c.initProcess.pid()
startTime, _ = c.initProcess.startTime()
externalDescriptors = c.initProcess.externalDescriptors()
}
state := &State{
BaseState: BaseState{
ID: c.ID(),
Config: *c.config,
InitProcessPid: pid,
InitProcessStartTime: startTime,
Created: c.created,
},
CgroupPaths: c.cgroupManager.GetPaths(),
NamespacePaths: make(map[configs.NamespaceType]string),
ExternalDescriptors: externalDescriptors,
}
if pid > 0 {
for _, ns := range c.config.Namespaces {
state.NamespacePaths[ns.Type] = ns.GetPath(pid)
}
for _, nsType := range configs.NamespaceTypes() {
if !configs.IsNamespaceSupported(nsType) {
continue
}
if _, ok := state.NamespacePaths[nsType]; !ok {
ns := configs.Namespace{Type: nsType}
state.NamespacePaths[ns.Type] = ns.GetPath(pid)
}
}
}
return state, nil
}
// orderNamespacePaths sorts namespace paths into a list of paths that we
// can setns in order.
func (c *linuxContainer) orderNamespacePaths(namespaces map[configs.NamespaceType]string) ([]string, error) {
paths := []string{}
order := []configs.NamespaceType{
// The user namespace *must* be done first.
configs.NEWUSER,
configs.NEWIPC,
configs.NEWUTS,
configs.NEWNET,
configs.NEWPID,
configs.NEWNS,
}
// Remove namespaces that we don't need to join.
var nsTypes []configs.NamespaceType
for _, ns := range order {
if c.config.Namespaces.Contains(ns) {
nsTypes = append(nsTypes, ns)
}
}
for _, nsType := range nsTypes {
if p, ok := namespaces[nsType]; ok && p != "" {
// check if the requested namespace is supported
if !configs.IsNamespaceSupported(nsType) {
return nil, newSystemError(fmt.Errorf("namespace %s is not supported", nsType))
}
// only set to join this namespace if it exists
if _, err := os.Lstat(p); err != nil {
return nil, newSystemErrorWithCausef(err, "running lstat on namespace path %q", p)
}
// do not allow namespace path with comma as we use it to separate
// the namespace paths
if strings.ContainsRune(p, ',') {
return nil, newSystemError(fmt.Errorf("invalid path %s", p))
}
paths = append(paths, fmt.Sprintf("%s:%s", configs.NsName(nsType), p))
}
}
return paths, nil
}