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package specgen
import (
"strings"
"github.com/pkg/errors"
)
type NamespaceMode string
const (
// Default indicates the spec generator should determine
// a sane default
Default NamespaceMode = "default"
// Host means the the namespace is derived from
// the host
Host NamespaceMode = "host"
// Path is the path to a namespace
Path NamespaceMode = "path"
// FromContainer means namespace is derived from a
// different container
FromContainer NamespaceMode = "container"
// FromPod indicates the namespace is derived from a pod
FromPod NamespaceMode = "pod"
// Private indicates the namespace is private
Private NamespaceMode = "private"
// NoNetwork indicates no network namespace should
// be joined. loopback should still exists
NoNetwork NamespaceMode = "none"
// Bridge indicates that a CNI network stack
// should be used
Bridge NamespaceMode = "bridge"
// Slirp indicates that a slirp4netns network stack should
// be used
Slirp NamespaceMode = "slirp4netns"
)
// Namespace describes the namespace
type Namespace struct {
NSMode NamespaceMode `json:"nsmode,omitempty"`
Value string `json:"string,omitempty"`
}
// IsDefault returns whether the namespace is set to the default setting (which
// also includes the empty string).
func (n *Namespace) IsDefault() bool {
return n.NSMode == Default || n.NSMode == ""
}
// IsHost returns a bool if the namespace is host based
func (n *Namespace) IsHost() bool {
return n.NSMode == Host
}
// IsPath indicates via bool if the namespace is based on a path
func (n *Namespace) IsPath() bool {
return n.NSMode == Path
}
// IsContainer indicates via bool if the namespace is based on a container
func (n *Namespace) IsContainer() bool {
return n.NSMode == FromContainer
}
// IsPod indicates via bool if the namespace is based on a pod
func (n *Namespace) IsPod() bool {
return n.NSMode == FromPod
}
// IsPrivate indicates the namespace is private
func (n *Namespace) IsPrivate() bool {
return n.NSMode == Private
}
func validateNetNS(n *Namespace) error {
if n == nil {
return nil
}
switch n.NSMode {
case "", Default, Host, Path, FromContainer, FromPod, Private, NoNetwork, Bridge, Slirp:
break
default:
return errors.Errorf("invalid network %q", n.NSMode)
}
// Path and From Container MUST have a string value set
if n.NSMode == Path || n.NSMode == FromContainer {
if len(n.Value) < 1 {
return errors.Errorf("namespace mode %s requires a value", n.NSMode)
}
} else {
// All others must NOT set a string value
if len(n.Value) > 0 {
return errors.Errorf("namespace value %s cannot be provided with namespace mode %s", n.Value, n.NSMode)
}
}
return nil
}
// Validate perform simple validation on the namespace to make sure it is not
// invalid from the get-go
func (n *Namespace) validate() error {
if n == nil {
return nil
}
switch n.NSMode {
case "", Default, Host, Path, FromContainer, FromPod, Private:
// Valid, do nothing
case NoNetwork, Bridge, Slirp:
return errors.Errorf("cannot use network modes with non-network namespace")
default:
return errors.Errorf("invalid namespace type %s specified", n.NSMode)
}
// Path and From Container MUST have a string value set
if n.NSMode == Path || n.NSMode == FromContainer {
if len(n.Value) < 1 {
return errors.Errorf("namespace mode %s requires a value", n.NSMode)
}
} else {
// All others must NOT set a string value
if len(n.Value) > 0 {
return errors.Errorf("namespace value %s cannot be provided with namespace mode %s", n.Value, n.NSMode)
}
}
return nil
}
// ParseNamespace parses a namespace in string form.
// This is not intended for the network namespace, which has a separate
// function.
func ParseNamespace(ns string) (Namespace, error) {
toReturn := Namespace{}
switch {
case ns == "host":
toReturn.NSMode = Host
case ns == "private":
toReturn.NSMode = Private
case strings.HasPrefix(ns, "ns:"):
split := strings.SplitN(ns, ":", 2)
if len(split) != 2 {
return toReturn, errors.Errorf("must provide a path to a namespace when specifying ns:")
}
toReturn.NSMode = Path
toReturn.Value = split[1]
case strings.HasPrefix(ns, "container:"):
split := strings.SplitN(ns, ":", 2)
if len(split) != 2 {
return toReturn, errors.Errorf("must provide name or ID or a container when specifying container:")
}
toReturn.NSMode = FromContainer
toReturn.Value = split[1]
default:
return toReturn, errors.Errorf("unrecognized namespace mode %s passed", ns)
}
return toReturn, nil
}
// ParseNetworkNamespace parses a network namespace specification in string
// form.
// Returns a namespace and (optionally) a list of CNI networks to join.
func ParseNetworkNamespace(ns string) (Namespace, []string, error) {
toReturn := Namespace{}
var cniNetworks []string
switch {
case ns == "bridge":
toReturn.NSMode = Bridge
case ns == "none":
toReturn.NSMode = NoNetwork
case ns == "host":
toReturn.NSMode = Host
case ns == "private":
toReturn.NSMode = Private
case strings.HasPrefix(ns, "ns:"):
split := strings.SplitN(ns, ":", 2)
if len(split) != 2 {
return toReturn, nil, errors.Errorf("must provide a path to a namespace when specifying ns:")
}
toReturn.NSMode = Path
toReturn.Value = split[1]
case strings.HasPrefix(ns, "container:"):
split := strings.SplitN(ns, ":", 2)
if len(split) != 2 {
return toReturn, nil, errors.Errorf("must provide name or ID or a container when specifying container:")
}
toReturn.NSMode = FromContainer
toReturn.Value = split[1]
default:
// Assume we have been given a list of CNI networks.
// Which only works in bridge mode, so set that.
cniNetworks = strings.Split(ns, ",")
toReturn.NSMode = Bridge
}
return toReturn, cniNetworks, nil
}
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