/
crictl.go
199 lines (175 loc) · 4.48 KB
/
crictl.go
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package crictl
import (
"context"
"fmt"
"os/exec"
"github.com/containerd/containerd"
taskservice "github.com/containerd/containerd/api/services/tasks/v1"
"github.com/containerd/containerd/namespaces"
"github.com/tidwall/gjson"
)
const (
cliCrictl = "crictl"
cliCrictlOptInspect = "inspect"
runtimeContainerd = "containerd"
runtimeCrio = "cri-o"
runtimeDocker = "docker"
contdNsDocker = "moby"
contdSocketPath = "/run/containerd/containerd.sock"
)
type Crictl struct {
// For crictl CLI
runtime string
opts []string
// For containerd client
// Docker CRI with "unix:///var/run/dockershim.sock" doesn't return PID, CWD and Env info.
// To avoid this issue, we use containerd client directly instead of crictl CLI.
dCtx context.Context
dClient *containerd.Client
}
func New(rt string) (*Crictl, error) {
// Docker
// Init containerd client
if rt == runtimeDocker {
client, err := containerd.New(contdSocketPath)
if err != nil {
return nil, err
}
ctx := namespaces.WithNamespace(context.Background(), contdNsDocker)
return &Crictl{
runtime: runtimeDocker,
dCtx: ctx,
dClient: client,
}, nil
}
// Else
// Only set runtime
return &Crictl{
runtime: rt,
}, nil
}
func (c *Crictl) SetSocketPath(socketPath string) error {
// Docker
// Replace new client for new socket path
if c.runtime == runtimeDocker {
client, err := containerd.New(socketPath)
if err != nil {
return err
}
c.dClient = client
}
// Else
// Set runtime endpoint option
c.opts = append(c.opts, "--runtime-endpoint", "unix://"+socketPath)
return nil
}
func (c *Crictl) GetInitPid(contID string) (uint64, error) {
// Docker
// Get PID from containerd
if c.runtime == runtimeDocker {
taskClient := c.dClient.TaskService()
cont, err := taskClient.Get(c.dCtx, &taskservice.GetRequest{
ContainerID: contID,
})
if err != nil {
return 0, err
}
return uint64(cont.Process.Pid), nil
}
// Else
// Get container info through crictl
args := append(c.opts, cliCrictlOptInspect, contID)
cmd := exec.Command(cliCrictl, args...)
info, err := cmd.Output()
if err != nil {
return 0, err
}
// Parsing init PID
pid := gjson.Get(string(info), "info.pid")
return pid.Uint(), nil
}
func (c *Crictl) GetRootPath(contID string) (string, error) {
// Docker
// Get rootfs from containerd
if c.runtime == runtimeDocker {
cont, err := c.dClient.LoadContainer(c.dCtx, contID)
if err != nil {
return "", err
}
spec, err := cont.Spec(c.dCtx)
if err != nil {
return "", err
}
return spec.Root.Path, nil
}
// Else
// Get container info through crictl
args := append(c.opts, cliCrictlOptInspect, contID)
cmd := exec.Command(cliCrictl, args...)
info, err := cmd.Output()
if err != nil {
return "", err
}
// Parsing rootfs and get absolute container rootfs path according to container runtime
rootDirPath := gjson.Get(string(info), "info.runtimeSpec.root.path")
if c.runtime == runtimeContainerd {
return fmt.Sprintf("/run/containerd/io.containerd.runtime.v2.task/k8s.io/%s/%s", contID, rootDirPath.String()), nil
}
return rootDirPath.String(), nil // CRI-O
}
func (c *Crictl) GetCWDPath(contID string) (string, error) {
// Docker
// Get CWD from containerd
if c.runtime == runtimeDocker {
cont, err := c.dClient.LoadContainer(c.dCtx, contID)
if err != nil {
return "", err
}
spec, err := cont.Spec(c.dCtx)
if err != nil {
return "", err
}
return spec.Process.Cwd, nil
}
// Else
// Get container info through crictl
args := append(c.opts, cliCrictlOptInspect, contID)
cmd := exec.Command(cliCrictl, args...)
info, err := cmd.Output()
if err != nil {
return "", err
}
// Parsing working dir
cwd := gjson.Get(string(info), "info.runtimeSpec.process.cwd")
return cwd.String(), nil
}
func (c *Crictl) GetEnvs(contID string) ([]string, error) {
// Docker
// Get envs from containerd
if c.runtime == runtimeDocker {
cont, err := c.dClient.LoadContainer(c.dCtx, contID)
if err != nil {
return nil, err
}
spec, err := cont.Spec(c.dCtx)
if err != nil {
return nil, err
}
return spec.Process.Env, nil
}
// Else
// Get container info through crictl
args := append(c.opts, cliCrictlOptInspect, contID)
cmd := exec.Command(cliCrictl, args...)
info, err := cmd.Output()
if err != nil {
return nil, err
}
// Parsing envs
var result []string
envs := gjson.Get(string(info), "info.runtimeSpec.process.env")
for _, env := range envs.Array() {
result = append(result, env.String())
}
return result, nil
}