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package main
import (
"fmt"
"os"
"strconv"
"strings"
"syscall"
"github.com/checkpoint-restore/go-criu"
"github.com/checkpoint-restore/go-criu/phaul"
"github.com/checkpoint-restore/go-criu/rpc"
"github.com/golang/protobuf/proto"
)
type testLocal struct {
criu.NoNotify
r *testRemote
}
type testRemote struct {
srv *phaul.Server
}
/* Dir where test will put dump images */
const imagesDir = "image"
func prepareImages() error {
err := os.Mkdir(imagesDir, 0700)
if err != nil {
return err
}
/* Work dir for PhaulClient */
err = os.Mkdir(imagesDir+"/local", 0700)
if err != nil {
return err
}
/* Work dir for PhaulServer */
err = os.Mkdir(imagesDir+"/remote", 0700)
if err != nil {
return err
}
/* Work dir for DumpCopyRestore */
err = os.Mkdir(imagesDir+"/test", 0700)
if err != nil {
return err
}
return nil
}
func mergeImages(dumpDir, lastPreDumpDir string) error {
idir, err := os.Open(dumpDir)
if err != nil {
return err
}
defer idir.Close()
imgs, err := idir.Readdirnames(0)
if err != nil {
return err
}
for _, fname := range imgs {
if !strings.HasSuffix(fname, ".img") {
continue
}
fmt.Printf("\t%s -> %s/\n", fname, lastPreDumpDir)
err = syscall.Link(dumpDir+"/"+fname, lastPreDumpDir+"/"+fname)
if err != nil {
return err
}
}
return nil
}
func (r *testRemote) doRestore() error {
lastSrvImagesDir := r.srv.LastImagesDir()
/*
* In imagesDir we have images from dump, in the
* lastSrvImagesDir -- where server-side images
* (from page server, with pages and pagemaps) are.
* Need to put former into latter and restore from
* them.
*/
err := mergeImages(imagesDir+"/test", lastSrvImagesDir)
if err != nil {
return err
}
imgDir, err := os.Open(lastSrvImagesDir)
if err != nil {
return err
}
defer imgDir.Close()
opts := rpc.CriuOpts{
LogLevel: proto.Int32(4),
LogFile: proto.String("restore.log"),
ImagesDirFd: proto.Int32(int32(imgDir.Fd())),
}
cr := r.srv.GetCriu()
fmt.Printf("Do restore\n")
return cr.Restore(opts, nil)
}
func (l *testLocal) PostDump() error {
return l.r.doRestore()
}
func (l *testLocal) DumpCopyRestore(cr *criu.Criu, cfg phaul.Config, lastClnImagesDir string) error {
fmt.Printf("Final stage\n")
imgDir, err := os.Open(imagesDir + "/test")
if err != nil {
return err
}
defer imgDir.Close()
psi := rpc.CriuPageServerInfo{
Fd: proto.Int32(int32(cfg.Memfd)),
}
opts := rpc.CriuOpts{
Pid: proto.Int32(int32(cfg.Pid)),
LogLevel: proto.Int32(4),
LogFile: proto.String("dump.log"),
ImagesDirFd: proto.Int32(int32(imgDir.Fd())),
TrackMem: proto.Bool(true),
ParentImg: proto.String(lastClnImagesDir),
Ps: &psi,
}
fmt.Printf("Do dump\n")
return cr.Dump(opts, l)
}
func main() {
pid, _ := strconv.Atoi(os.Args[1])
fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)
if err != nil {
fmt.Printf("Can't make socketpair: %v\n", err)
os.Exit(1)
}
err = prepareImages()
if err != nil {
fmt.Printf("Can't prepare dirs for images: %v\n", err)
os.Exit(1)
return
}
fmt.Printf("Make server part (socket %d)\n", fds[1])
srv, err := phaul.MakePhaulServer(phaul.Config{
Pid: pid,
Memfd: fds[1],
Wdir: imagesDir + "/remote"})
if err != nil {
fmt.Printf("Unable to run a server: %v", err)
os.Exit(1)
return
}
r := &testRemote{srv}
fmt.Printf("Make client part (socket %d)\n", fds[0])
cln, err := phaul.MakePhaulClient(&testLocal{r: r}, srv,
phaul.Config{
Pid: pid,
Memfd: fds[0],
Wdir: imagesDir + "/local"})
if err != nil {
fmt.Printf("Unable to run a client: %v\n", err)
os.Exit(1)
}
fmt.Printf("Migrate\n")
err = cln.Migrate()
if err != nil {
fmt.Printf("Failed: %v\n", err)
os.Exit(1)
}
fmt.Printf("SUCCESS!\n")
}
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