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// +build linux
package libpod
import (
"github.com/containers/podman/v3/libpod/define"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// replaceNetNS handle network namespace transitions after updating a
// container's state.
func replaceNetNS(netNSPath string, ctr *Container, newState *ContainerState) error {
if netNSPath != "" {
// Check if the container's old state has a good netns
if ctr.state.NetNS != nil && netNSPath == ctr.state.NetNS.Path() {
newState.NetNS = ctr.state.NetNS
} else {
// Close the existing namespace.
// Whoever removed it from the database already tore it down.
if err := ctr.runtime.closeNetNS(ctr); err != nil {
return err
}
// Open the new network namespace
ns, err := joinNetNS(netNSPath)
if err == nil {
newState.NetNS = ns
} else {
if ctr.ensureState(define.ContainerStateRunning, define.ContainerStatePaused) {
return errors.Wrapf(err, "error joining network namespace of container %s", ctr.ID())
}
logrus.Errorf("Joining network namespace for container %s: %v", ctr.ID(), err)
ctr.state.NetNS = nil
}
}
} else {
// The container no longer has a network namespace
// Close the old one, whoever removed it from the DB should have
// cleaned it up already.
if err := ctr.runtime.closeNetNS(ctr); err != nil {
return err
}
}
return nil
}
// getNetNSPath retrieves the netns path to be stored in the database
func getNetNSPath(ctr *Container) string {
if ctr.state.NetNS != nil {
return ctr.state.NetNS.Path()
}
return ""
}
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