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main.go
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main.go
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package main
import (
"fmt"
"log"
"os"
"strconv"
"github.com/checkpoint-restore/go-criu/v6"
"github.com/checkpoint-restore/go-criu/v6/rpc"
"google.golang.org/protobuf/proto"
)
// TestNfy struct
type TestNfy struct {
criu.NoNotify
}
// PreDump test function
func (c TestNfy) PreDump() error {
log.Println("TEST PRE DUMP")
return nil
}
func doDump(c *criu.Criu, pidS string, imgDir string, pre bool, prevImg string) error {
log.Println("Dumping")
pid, err := strconv.ParseInt(pidS, 10, 0)
if err != nil {
return fmt.Errorf("can't parse pid: %w", err)
}
img, err := os.Open(imgDir)
if err != nil {
return fmt.Errorf("can't open image dir: %w", err)
}
defer img.Close()
opts := &rpc.CriuOpts{
Pid: proto.Int32(int32(pid)),
ImagesDirFd: proto.Int32(int32(img.Fd())),
LogLevel: proto.Int32(4),
LogFile: proto.String("dump.log"),
}
if prevImg != "" {
opts.ParentImg = proto.String(prevImg)
opts.TrackMem = proto.Bool(true)
}
if pre {
err = c.PreDump(opts, TestNfy{})
} else {
err = c.Dump(opts, TestNfy{})
}
if err != nil {
return fmt.Errorf("dump fail: %w", err)
}
return nil
}
func featureCheck(c *criu.Criu) error {
features := &rpc.CriuFeatures{}
featuresToCompare := &rpc.CriuFeatures{}
env := os.Getenv("CRIU_FEATURE_MEM_TRACK")
if env != "" {
val, err := strconv.Atoi(env)
if err != nil {
return err
}
features.MemTrack = proto.Bool(val != 0)
featuresToCompare.MemTrack = proto.Bool(val != 0)
}
env = os.Getenv("CRIU_FEATURE_LAZY_PAGES")
if env != "" {
val, err := strconv.Atoi(env)
if err != nil {
return err
}
features.LazyPages = proto.Bool(val != 0)
featuresToCompare.LazyPages = proto.Bool(val != 0)
}
env = os.Getenv("CRIU_FEATURE_PIDFD_STORE")
if env != "" {
val, err := strconv.Atoi(env)
if err != nil {
return err
}
features.PidfdStore = proto.Bool(val != 0)
featuresToCompare.PidfdStore = proto.Bool(val != 0)
}
features, err := c.FeatureCheck(features)
if err != nil {
return err
}
if *features.MemTrack != *featuresToCompare.MemTrack {
return fmt.Errorf(
"Unexpected MemTrack FeatureCheck result %v:%v",
*features.MemTrack,
*featuresToCompare.MemTrack,
)
}
if *features.LazyPages != *featuresToCompare.LazyPages {
return fmt.Errorf(
"Unexpected LazyPages FeatureCheck result %v:%v",
*features.LazyPages,
*featuresToCompare.LazyPages,
)
}
if *features.PidfdStore != *featuresToCompare.PidfdStore {
return fmt.Errorf(
"Unexpected PidfdStore FeatureCheck result %v:%v",
*features.PidfdStore,
*featuresToCompare.PidfdStore,
)
}
return nil
}
// Usage: test $act $pid $images_dir
func main() {
c := criu.MakeCriu()
// Read out CRIU version
version, err := c.GetCriuVersion()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
log.Println("CRIU version", version)
// Check if version at least 3.2
result, err := c.IsCriuAtLeast(30200)
if err != nil {
log.Fatalln(err)
}
if !result {
log.Fatalln("CRIU version to old")
}
if err = featureCheck(c); err != nil {
log.Fatalln(err)
}
act := os.Args[1]
switch act {
case "dump":
err := doDump(c, os.Args[2], os.Args[3], false, "")
if err != nil {
log.Fatalln("dump failed:", err)
}
case "dump2":
err := c.Prepare()
if err != nil {
fmt.Print(err)
os.Exit(1)
}
err = doDump(c, os.Args[2], os.Args[3]+"/pre", true, "")
if err != nil {
log.Fatalln("pre-dump failed:", err)
}
err = doDump(c, os.Args[2], os.Args[3], false, "./pre")
if err != nil {
log.Fatalln("dump failed: ", err)
}
c.Cleanup()
case "restore":
log.Println("Restoring")
img, err := os.Open(os.Args[2])
if err != nil {
log.Fatalln("can't open image dir:", err)
}
defer img.Close()
opts := &rpc.CriuOpts{
ImagesDirFd: proto.Int32(int32(img.Fd())),
LogLevel: proto.Int32(4),
LogFile: proto.String("restore.log"),
}
err = c.Restore(opts, nil)
if err != nil {
log.Fatalln("restore failed:", err)
}
default:
log.Fatalln("unknown action")
}
log.Println("Success")
}