/
crio.go
81 lines (64 loc) · 1.86 KB
/
crio.go
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package crio
import (
"fmt"
jsoniter "github.com/json-iterator/go"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"io/ioutil"
"strconv"
)
type Crio struct {
}
func NewCrio() *Crio {
return &Crio{}
}
var crioConfigFile = func(containerID string) string {
return fmt.Sprintf("/var/lib/containers/storage/overlay-containers/%s/userdata/config.json", containerID)
}
var crioStateFile = func(containerID string) string {
return fmt.Sprintf("/var/lib/containers/storage/overlay-containers/%s/userdata/state.json", containerID)
}
func (c *Crio) RootFileSystemLocation(containerID string) (string, error) {
if containerID == "" {
return "", errors.New("container ID is mandatory")
}
spec, err := runtimeSpec(crioConfigFile(containerID))
if err != nil {
return "", err
}
return spec.Root.Path, nil
}
func runtimeSpec(configFile string) (rspec.Spec, error) {
file, err := ioutil.ReadFile(configFile)
if err != nil {
return rspec.Spec{}, errors.Wrapf(err, "read file failed: %s", configFile)
}
var result rspec.Spec
err = jsoniter.Unmarshal(file, &result)
if err != nil {
return rspec.Spec{}, errors.Wrapf(err, "unmarshal file failed: %s", configFile)
}
return result, nil
}
func (c *Crio) PID(containerID string) (string, error) {
if containerID == "" {
return "", errors.New("container ID is mandatory")
}
state, err := runtimeState(crioStateFile(containerID))
if err != nil {
return "", err
}
return strconv.Itoa(state.Pid), nil
}
func runtimeState(stateFile string) (rspec.State, error) {
file, err := ioutil.ReadFile(stateFile)
if err != nil {
return rspec.State{}, errors.Wrapf(err, "read file failed: %s", stateFile)
}
var result rspec.State
err = jsoniter.Unmarshal(file, &result)
if err != nil {
return rspec.State{}, errors.Wrapf(err, "unmarshal file failed: %s", stateFile)
}
return result, nil
}