vendor in go-criu and dependencies

Signed-off-by: Adrian Reber <areber@redhat.com>

vendor/github.com/checkpoint-restore/go-criu/LICENSE

@@ -0,0 +1,201 @@
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vendor/github.com/checkpoint-restore/go-criu/README.md

@@ -0,0 +1,27 @@
+[![master](https://travis-ci.org/checkpoint-restore/go-criu.svg?branch=master)](https://travis-ci.org/checkpoint-restore/go-criu)
+
+## go-criu -- Go bindings for [CRIU](https://criu.org/)
+
+This repository provides Go bindings for CRIU. The code is based on the Go based PHaul
+implementation from the CRIU repository. For easier inclusion into other Go projects the
+CRIU Go bindings have been moved to this repository.
+
+The Go bindings provide an easy way to use the CRIU RPC calls from Go without the need
+to set up all the infrastructure to make the actual RPC connection to CRIU.
+
+The following example would print the version of CRIU:
+```
+	c := criu.MakeCriu()
+	version, err := c.GetCriuVersion()
+	fmt.Println(version)
+```
+or to just check if at least a certain CRIU version is installed:
+```
+	c := criu.MakeCriu()
+	result, err := c.IsCriuAtLeast(31100)
+```
+
+### License
+
+The license of go-criu is the Apache 2.0 license.
+

vendor/github.com/checkpoint-restore/go-criu/main.go

@@ -0,0 +1,250 @@
+package criu
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"strconv"
+	"syscall"
+
+	"github.com/checkpoint-restore/go-criu/rpc"
+	"github.com/golang/protobuf/proto"
+)
+
+// Criu struct
+type Criu struct {
+	swrkCmd *exec.Cmd
+	swrkSk  *os.File
+}
+
+// MakeCriu returns the Criu object required for most operations
+func MakeCriu() *Criu {
+	return &Criu{}
+}
+
+// Prepare sets up everything for the RPC communication to CRIU
+func (c *Criu) Prepare() error {
+	fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_SEQPACKET, 0)
+	if err != nil {
+		return err
+	}
+
+	cln := os.NewFile(uintptr(fds[0]), "criu-xprt-cln")
+	syscall.CloseOnExec(fds[0])
+	srv := os.NewFile(uintptr(fds[1]), "criu-xprt-srv")
+	defer srv.Close()
+
+	args := []string{"swrk", strconv.Itoa(fds[1])}
+	cmd := exec.Command("criu", args...)
+
+	err = cmd.Start()
+	if err != nil {
+		cln.Close()
+		return err
+	}
+
+	c.swrkCmd = cmd
+	c.swrkSk = cln
+
+	return nil
+}
+
+// Cleanup cleans up
+func (c *Criu) Cleanup() {
+	if c.swrkCmd != nil {
+		c.swrkSk.Close()
+		c.swrkSk = nil
+		c.swrkCmd.Wait()
+		c.swrkCmd = nil
+	}
+}
+
+func (c *Criu) sendAndRecv(reqB []byte) ([]byte, int, error) {
+	cln := c.swrkSk
+	_, err := cln.Write(reqB)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	respB := make([]byte, 2*4096)
+	n, err := cln.Read(respB)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	return respB, n, nil
+}
+
+func (c *Criu) doSwrk(reqType rpc.CriuReqType, opts *rpc.CriuOpts, nfy Notify) error {
+	resp, err := c.doSwrkWithResp(reqType, opts, nfy)
+	if err != nil {
+		return err
+	}
+	respType := resp.GetType()
+	if respType != reqType {
+		return errors.New("unexpected responce")
+	}
+
+	return nil
+}
+
+func (c *Criu) doSwrkWithResp(reqType rpc.CriuReqType, opts *rpc.CriuOpts, nfy Notify) (*rpc.CriuResp, error) {
+	var resp *rpc.CriuResp
+
+	req := rpc.CriuReq{
+		Type: &reqType,
+		Opts: opts,
+	}
+
+	if nfy != nil {
+		opts.NotifyScripts = proto.Bool(true)
+	}
+
+	if c.swrkCmd == nil {
+		err := c.Prepare()
+		if err != nil {
+			return nil, err
+		}
+
+		defer c.Cleanup()
+	}
+
+	for {
+		reqB, err := proto.Marshal(&req)
+		if err != nil {
+			return nil, err
+		}
+
+		respB, respS, err := c.sendAndRecv(reqB)
+		if err != nil {
+			return nil, err
+		}
+
+		resp = &rpc.CriuResp{}
+		err = proto.Unmarshal(respB[:respS], resp)
+		if err != nil {
+			return nil, err
+		}
+
+		if !resp.GetSuccess() {
+			return resp, fmt.Errorf("operation failed (msg:%s err:%d)",
+				resp.GetCrErrmsg(), resp.GetCrErrno())
+		}
+
+		respType := resp.GetType()
+		if respType != rpc.CriuReqType_NOTIFY {
+			break
+		}
+		if nfy == nil {
+			return resp, errors.New("unexpected notify")
+		}
+
+		notify := resp.GetNotify()
+		switch notify.GetScript() {
+		case "pre-dump":
+			err = nfy.PreDump()
+		case "post-dump":
+			err = nfy.PostDump()
+		case "pre-restore":
+			err = nfy.PreRestore()
+		case "post-restore":
+			err = nfy.PostRestore(notify.GetPid())
+		case "network-lock":
+			err = nfy.NetworkLock()
+		case "network-unlock":
+			err = nfy.NetworkUnlock()
+		case "setup-namespaces":
+			err = nfy.SetupNamespaces(notify.GetPid())
+		case "post-setup-namespaces":
+			err = nfy.PostSetupNamespaces()
+		case "post-resume":
+			err = nfy.PostResume()
+		default:
+			err = nil
+		}
+
+		if err != nil {
+			return resp, err
+		}
+
+		req = rpc.CriuReq{
+			Type:          &respType,
+			NotifySuccess: proto.Bool(true),
+		}
+	}
+
+	return resp, nil
+}
+
+// Dump dumps a process
+func (c *Criu) Dump(opts rpc.CriuOpts, nfy Notify) error {
+	return c.doSwrk(rpc.CriuReqType_DUMP, &opts, nfy)
+}
+
+// Restore restores a process
+func (c *Criu) Restore(opts rpc.CriuOpts, nfy Notify) error {
+	return c.doSwrk(rpc.CriuReqType_RESTORE, &opts, nfy)
+}
+
+// PreDump does a pre-dump
+func (c *Criu) PreDump(opts rpc.CriuOpts, nfy Notify) error {
+	return c.doSwrk(rpc.CriuReqType_PRE_DUMP, &opts, nfy)
+}
+
+// StartPageServer starts the page server
+func (c *Criu) StartPageServer(opts rpc.CriuOpts) error {
+	return c.doSwrk(rpc.CriuReqType_PAGE_SERVER, &opts, nil)
+}
+
+// StartPageServerChld starts the page server and returns PID and port
+func (c *Criu) StartPageServerChld(opts rpc.CriuOpts) (int, int, error) {
+	resp, err := c.doSwrkWithResp(rpc.CriuReqType_PAGE_SERVER_CHLD, &opts, nil)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return int(resp.Ps.GetPid()), int(resp.Ps.GetPort()), nil
+}
+
+// GetCriuVersion executes the VERSION RPC call and returns the version
+// as an integer. Major * 10000 + Minor * 100 + SubLevel
+func (c *Criu) GetCriuVersion() (int, error) {
+	resp, err := c.doSwrkWithResp(rpc.CriuReqType_VERSION, nil, nil)
+	if err != nil {
+		return 0, err
+	}
+
+	if resp.GetType() != rpc.CriuReqType_VERSION {
+		return 0, fmt.Errorf("Unexpected CRIU RPC response")
+	}
+
+	version := int(*resp.GetVersion().Major) * 10000
+	version += int(*resp.GetVersion().Minor) * 100
+	if resp.GetVersion().Sublevel != nil {
+		version += int(*resp.GetVersion().Sublevel)
+	}
+
+	if resp.GetVersion().Gitid != nil {
+		// taken from runc: if it is a git release -> increase minor by 1
+		version -= (version % 100)
+		version += 100
+	}
+
+	return version, nil
+}
+
+// IsCriuAtLeast checks if the version is at least the same
+// as the parameter version
+func (c *Criu) IsCriuAtLeast(version int) (bool, error) {
+	criuVersion, err := c.GetCriuVersion()
+	if err != nil {
+		return false, err
+	}
+
+	if criuVersion >= version {
+		return true, nil
+	}
+
+	return false, nil
+}

vendor/github.com/checkpoint-restore/go-criu/notify.go

@@ -0,0 +1,63 @@
+package criu
+
+//Notify interface
+type Notify interface {
+	PreDump() error
+	PostDump() error
+	PreRestore() error
+	PostRestore(pid int32) error
+	NetworkLock() error
+	NetworkUnlock() error
+	SetupNamespaces(pid int32) error
+	PostSetupNamespaces() error
+	PostResume() error
+}
+
+// NoNotify struct
+type NoNotify struct {
+}
+
+// PreDump NoNotify
+func (c NoNotify) PreDump() error {
+	return nil
+}
+
+// PostDump NoNotify
+func (c NoNotify) PostDump() error {
+	return nil
+}
+
+// PreRestore NoNotify
+func (c NoNotify) PreRestore() error {
+	return nil
+}
+
+// PostRestore NoNotify
+func (c NoNotify) PostRestore(pid int32) error {
+	return nil
+}
+
+// NetworkLock NoNotify
+func (c NoNotify) NetworkLock() error {
+	return nil
+}
+
+// NetworkUnlock NoNotify
+func (c NoNotify) NetworkUnlock() error {
+	return nil
+}
+
+// SetupNamespaces NoNotify
+func (c NoNotify) SetupNamespaces(pid int32) error {
+	return nil
+}
+
+// PostSetupNamespaces NoNotify
+func (c NoNotify) PostSetupNamespaces() error {
+	return nil
+}
+
+// PostResume NoNotify
+func (c NoNotify) PostResume() error {
+	return nil
+}

vendor/github.com/checkpoint-restore/go-criu/test/main.go

@@ -0,0 +1,133 @@
+package main
+
+import (
+	"fmt"
+	"github.com/checkpoint-restore/go-criu"
+	"github.com/checkpoint-restore/go-criu/rpc"
+	"github.com/golang/protobuf/proto"
+	"os"
+	"strconv"
+)
+
+// TestNfy struct
+type TestNfy struct {
+	criu.NoNotify
+}
+
+// PreDump test function
+func (c TestNfy) PreDump() error {
+	fmt.Printf("TEST PRE DUMP\n")
+	return nil
+}
+
+func doDump(c *criu.Criu, pidS string, imgDir string, pre bool, prevImg string) error {
+	fmt.Printf("Dumping\n")
+	pid, _ := strconv.Atoi(pidS)
+	img, err := os.Open(imgDir)
+	if err != nil {
+		return fmt.Errorf("can't open image dir (%s)", 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 (%s)", err)
+	}
+
+	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)
+	}
+	fmt.Println("CRIU version", version)
+	// Check if version at least 3.2
+	result, err := c.IsCriuAtLeast(30200)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	if !result {
+		fmt.Println("CRIU too old")
+		os.Exit(1)
+	}
+	act := os.Args[1]
+	switch act {
+	case "dump":
+		err := doDump(c, os.Args[2], os.Args[3], false, "")
+		if err != nil {
+			fmt.Print(err)
+			os.Exit(1)
+		}
+	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 {
+			fmt.Printf("pre-dump failed")
+			fmt.Print(err)
+			os.Exit(1)
+		}
+		err = doDump(c, os.Args[2], os.Args[3], false, "./pre")
+		if err != nil {
+			fmt.Printf("dump failed")
+			fmt.Print(err)
+			os.Exit(1)
+		}
+
+		c.Cleanup()
+	case "restore":
+		fmt.Printf("Restoring\n")
+		img, err := os.Open(os.Args[2])
+		if err != nil {
+			fmt.Printf("can't open image dir")
+			os.Exit(1)
+		}
+		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 {
+			fmt.Printf("Error:")
+			fmt.Print(err)
+			fmt.Printf("\n")
+			os.Exit(1)
+		}
+	default:
+		fmt.Printf("unknown action\n")
+		os.Exit(1)
+	}
+
+	fmt.Printf("Success\n")
+}

vendor/github.com/checkpoint-restore/go-criu/test/phaul-main.go

@@ -0,0 +1,192 @@
+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")
+}

vendor/github.com/checkpoint-restore/go-criu/test/piggie.c

@@ -0,0 +1,57 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <sched.h>
+
+#define STKS	(4*4096)
+
+#ifndef CLONE_NEWPID
+#define CLONE_NEWPID    0x20000000
+#endif
+
+static int do_test(void *logf)
+{
+	int fd, i = 0;
+
+	setsid();
+
+	close(0);
+	close(1);
+	close(2);
+
+	fd = open("/dev/null", O_RDONLY);
+	if (fd != 0) {
+		dup2(fd, 0);
+		close(fd);
+	}
+
+	fd = open(logf, O_WRONLY | O_TRUNC | O_CREAT, 0600);
+	dup2(fd, 1);
+	dup2(fd, 2);
+	if (fd != 1 && fd != 2)
+		close(fd);
+
+	while (1) {
+		sleep(1);
+		printf("%d\n", i++);
+		fflush(stdout);
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	int pid;
+	void *stk;
+
+	stk = mmap(NULL, STKS, PROT_READ | PROT_WRITE,
+			MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN, 0, 0);
+	pid = clone(do_test, stk + STKS, SIGCHLD | CLONE_NEWPID, argv[1]);
+	printf("Child forked, pid %d\n", pid);
+
+	return 0;
+}