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How to use Close method of gce Package

Best Syzkaller code snippet using gce.Close

gce.go

Source:gce.go

...52	gceKey   string // per-instance private ssh key associated with the instance53	sshKey   string // ssh key54	sshUser  string55	closed   chan bool56	consolew io.WriteCloser57}58func ctor(env *vmimpl.Env) (vmimpl.Pool, error) {59	if env.Name == "" {60		return nil, fmt.Errorf("config param name is empty (required for GCE)")61	}62	cfg := &Config{63		Count:       1,64		Preemptible: true,65	}66	if err := config.LoadData(env.Config, cfg); err != nil {67		return nil, fmt.Errorf("failed to parse gce vm config: %v", err)68	}69	if cfg.Count < 1 || cfg.Count > 1000 {70		return nil, fmt.Errorf("invalid config param count: %v, want [1, 1000]", cfg.Count)71	}72	if env.Debug && cfg.Count > 1 {73		log.Logf(0, "limiting number of VMs from %v to 1 in debug mode", cfg.Count)74		cfg.Count = 175	}76	if cfg.MachineType == "" {77		return nil, fmt.Errorf("machine_type parameter is empty")78	}79	if cfg.GCEImage == "" && cfg.GCSPath == "" {80		return nil, fmt.Errorf("gcs_path parameter is empty")81	}82	if cfg.GCEImage == "" && env.Image == "" {83		return nil, fmt.Errorf("config param image is empty (required for GCE)")84	}85	if cfg.GCEImage != "" && env.Image != "" {86		return nil, fmt.Errorf("both image and gce_image are specified")87	}88	GCE, err := gce.NewContext()89	if err != nil {90		return nil, fmt.Errorf("failed to init gce: %v", err)91	}92	log.Logf(0, "GCE initialized: running on %v, internal IP %v, project %v, zone %v, net %v/%v",93		GCE.Instance, GCE.InternalIP, GCE.ProjectID, GCE.ZoneID, GCE.Network, GCE.Subnetwork)94	if cfg.GCEImage == "" {95		cfg.GCEImage = env.Name96		gcsImage := filepath.Join(cfg.GCSPath, env.Name+"-image.tar.gz")97		log.Logf(0, "uploading image %v to %v...", env.Image, gcsImage)98		if err := uploadImageToGCS(env.Image, gcsImage); err != nil {99			return nil, err100		}101		log.Logf(0, "creating GCE image %v...", cfg.GCEImage)102		if err := GCE.DeleteImage(cfg.GCEImage); err != nil {103			return nil, fmt.Errorf("failed to delete GCE image: %v", err)104		}105		if err := GCE.CreateImage(cfg.GCEImage, gcsImage); err != nil {106			return nil, fmt.Errorf("failed to create GCE image: %v", err)107		}108	}109	pool := &Pool{110		cfg: cfg,111		env: env,112		GCE: GCE,113	}114	return pool, nil115}116func (pool *Pool) Count() int {117	return pool.cfg.Count118}119func (pool *Pool) Create(workdir string, index int) (vmimpl.Instance, error) {120	name := fmt.Sprintf("%v-%v", pool.env.Name, index)121	// Create SSH key for the instance.122	gceKey := filepath.Join(workdir, "key")123	keygen := osutil.Command("ssh-keygen", "-t", "rsa", "-b", "2048", "-N", "", "-C", "syzkaller", "-f", gceKey)124	if out, err := keygen.CombinedOutput(); err != nil {125		return nil, fmt.Errorf("failed to execute ssh-keygen: %v\n%s", err, out)126	}127	gceKeyPub, err := ioutil.ReadFile(gceKey + ".pub")128	if err != nil {129		return nil, fmt.Errorf("failed to read file: %v", err)130	}131	log.Logf(0, "deleting instance: %v", name)132	if err := pool.GCE.DeleteInstance(name, true); err != nil {133		return nil, err134	}135	log.Logf(0, "creating instance: %v", name)136	ip, err := pool.GCE.CreateInstance(name, pool.cfg.MachineType, pool.cfg.GCEImage,137		string(gceKeyPub), pool.cfg.Preemptible)138	if err != nil {139		return nil, err140	}141	ok := false142	defer func() {143		if !ok {144			pool.GCE.DeleteInstance(name, true)145		}146	}()147	sshKey := pool.env.SSHKey148	sshUser := pool.env.SSHUser149	if sshKey == "" {150		// Assuming image supports GCE ssh fanciness.151		sshKey = gceKey152		sshUser = "syzkaller"153	}154	log.Logf(0, "wait instance to boot: %v (%v)", name, ip)155	if err := vmimpl.WaitForSSH(pool.env.Debug, 5*time.Minute, ip,156		sshKey, sshUser, pool.env.OS, 22, nil); err != nil {157		output, outputErr := pool.getSerialPortOutput(name, gceKey)158		if outputErr != nil {159			output = []byte(fmt.Sprintf("failed to get boot output: %v", outputErr))160		}161		return nil, vmimpl.MakeBootError(err, output)162	}163	ok = true164	inst := &instance{165		env:     pool.env,166		cfg:     pool.cfg,167		debug:   pool.env.Debug,168		GCE:     pool.GCE,169		name:    name,170		ip:      ip,171		gceKey:  gceKey,172		sshKey:  sshKey,173		sshUser: sshUser,174		closed:  make(chan bool),175	}176	return inst, nil177}178func (inst *instance) Close() {179	close(inst.closed)180	inst.GCE.DeleteInstance(inst.name, false)181	if inst.consolew != nil {182		inst.consolew.Close()183	}184}185func (inst *instance) Forward(port int) (string, error) {186	return fmt.Sprintf("%v:%v", inst.GCE.InternalIP, port), nil187}188func (inst *instance) Copy(hostSrc string) (string, error) {189	vmDst := "./" + filepath.Base(hostSrc)190	args := append(vmimpl.SCPArgs(inst.debug, inst.sshKey, 22), hostSrc, inst.sshUser+"@"+inst.ip+":"+vmDst)191	if err := runCmd(inst.debug, "scp", args...); err != nil {192		return "", err193	}194	return vmDst, nil195}196func (inst *instance) Run(timeout time.Duration, stop <-chan bool, command string) (197	<-chan []byte, <-chan error, error) {198	conRpipe, conWpipe, err := osutil.LongPipe()199	if err != nil {200		return nil, nil, err201	}202	conAddr := fmt.Sprintf("%v.%v.%v.syzkaller.port=1@ssh-serialport.googleapis.com",203		inst.GCE.ProjectID, inst.GCE.ZoneID, inst.name)204	conArgs := append(vmimpl.SSHArgs(inst.debug, inst.gceKey, 9600), conAddr)205	con := osutil.Command("ssh", conArgs...)206	con.Env = []string{}207	con.Stdout = conWpipe208	con.Stderr = conWpipe209	conw, err := con.StdinPipe()210	if err != nil {211		conRpipe.Close()212		conWpipe.Close()213		return nil, nil, err214	}215	if inst.consolew != nil {216		inst.consolew.Close()217	}218	inst.consolew = conw219	if err := con.Start(); err != nil {220		conRpipe.Close()221		conWpipe.Close()222		return nil, nil, fmt.Errorf("failed to connect to console server: %v", err)223	}224	conWpipe.Close()225	var tee io.Writer226	if inst.debug {227		tee = os.Stdout228	}229	merger := vmimpl.NewOutputMerger(tee)230	var decoder func(data []byte) (int, int, []byte)231	if inst.env.OS == "windows" {232		decoder = kd.Decode233	}234	merger.AddDecoder("console", conRpipe, decoder)235	if err := waitForConsoleConnect(merger); err != nil {236		con.Process.Kill()237		merger.Wait()238		return nil, nil, err239	}240	sshRpipe, sshWpipe, err := osutil.LongPipe()241	if err != nil {242		con.Process.Kill()243		merger.Wait()244		sshRpipe.Close()245		return nil, nil, err246	}247	if inst.env.OS == "linux" {248		if inst.sshUser != "root" {249			command = fmt.Sprintf("sudo bash -c '%v'", command)250		}251	}252	args := append(vmimpl.SSHArgs(inst.debug, inst.sshKey, 22), inst.sshUser+"@"+inst.ip, command)253	ssh := osutil.Command("ssh", args...)254	ssh.Stdout = sshWpipe255	ssh.Stderr = sshWpipe256	if err := ssh.Start(); err != nil {257		con.Process.Kill()258		merger.Wait()259		sshRpipe.Close()260		sshWpipe.Close()261		return nil, nil, fmt.Errorf("failed to connect to instance: %v", err)262	}263	sshWpipe.Close()264	merger.Add("ssh", sshRpipe)265	errc := make(chan error, 1)266	signal := func(err error) {267		select {268		case errc <- err:269		default:270		}271	}272	go func() {273		select {274		case <-time.After(timeout):275			signal(vmimpl.ErrTimeout)276		case <-stop:277			signal(vmimpl.ErrTimeout)278		case <-inst.closed:279			signal(fmt.Errorf("instance closed"))280		case err := <-merger.Err:281			con.Process.Kill()282			ssh.Process.Kill()283			merger.Wait()284			con.Wait()285			if cmdErr := ssh.Wait(); cmdErr == nil {286				// If the command exited successfully, we got EOF error from merger.287				// But in this case no error has happened and the EOF is expected.288				err = nil289			} else if merr, ok := err.(vmimpl.MergerError); ok && merr.R == conRpipe {290				// Console connection must never fail. If it does, it's either291				// instance preemption or a GCE bug. In either case, not a kernel bug.292				log.Logf(1, "%v: gce console connection failed with %v", inst.name, merr.Err)293				err = vmimpl.ErrTimeout294			} else {295				// Check if the instance was terminated due to preemption or host maintenance.296				time.Sleep(5 * time.Second) // just to avoid any GCE races297				if !inst.GCE.IsInstanceRunning(inst.name) {298					log.Logf(1, "%v: ssh exited but instance is not running", inst.name)299					err = vmimpl.ErrTimeout300				}301			}302			signal(err)303			return304		}305		con.Process.Kill()306		ssh.Process.Kill()307		merger.Wait()308		con.Wait()309		ssh.Wait()310	}()311	return merger.Output, errc, nil312}313func waitForConsoleConnect(merger *vmimpl.OutputMerger) error {314	// We've started the console reading ssh command, but it has not necessary connected yet.315	// If we proceed to running the target command right away, we can miss part316	// of console output. During repro we can crash machines very quickly and317	// would miss beginning of a crash. Before ssh starts piping console output,318	// it usually prints:319	// "serialport: Connected to ... port 1 (session ID: ..., active connections: 1)"320	// So we wait for this line, or at least a minute and at least some output.321	timeout := time.NewTimer(time.Minute)322	defer timeout.Stop()323	connectedMsg := []byte("serialport: Connected")324	permissionDeniedMsg := []byte("Permission denied (publickey)")325	var output []byte326	for {327		select {328		case out := <-merger.Output:329			output = append(output, out...)330			if bytes.Contains(output, connectedMsg) {331				// Just to make sure (otherwise we still see trimmed reports).332				time.Sleep(5 * time.Second)333				return nil334			}335			if bytes.Contains(output, permissionDeniedMsg) {336				// This is a GCE bug.337				return fmt.Errorf("broken console: %s", permissionDeniedMsg)338			}339		case <-timeout.C:340			if len(output) == 0 {341				return fmt.Errorf("broken console: no output")342			}343			return nil344		}345	}346}347func (inst *instance) Diagnose() ([]byte, bool) {348	if inst.env.OS == "openbsd" {349		return nil, vmimpl.DiagnoseOpenBSD(inst.consolew)350	}351	return nil, false352}353func (pool *Pool) getSerialPortOutput(name, gceKey string) ([]byte, error) {354	conRpipe, conWpipe, err := osutil.LongPipe()355	if err != nil {356		return nil, err357	}358	defer conRpipe.Close()359	defer conWpipe.Close()360	conAddr := fmt.Sprintf("%v.%v.%v.syzkaller.port=1.replay-lines=10000@ssh-serialport.googleapis.com",361		pool.GCE.ProjectID, pool.GCE.ZoneID, name)362	conArgs := append(vmimpl.SSHArgs(pool.env.Debug, gceKey, 9600), conAddr)363	con := osutil.Command("ssh", conArgs...)364	con.Env = []string{}365	con.Stdout = conWpipe366	con.Stderr = conWpipe367	if _, err := con.StdinPipe(); err != nil { // SSH would close connection on stdin EOF368		return nil, err369	}370	if err := con.Start(); err != nil {371		return nil, fmt.Errorf("failed to connect to console server: %v", err)372	}373	conWpipe.Close()374	done := make(chan bool)375	go func() {376		timeout := time.NewTimer(time.Minute)377		defer timeout.Stop()378		select {379		case <-done:380		case <-timeout.C:381		}382		con.Process.Kill()383	}()384	var output []byte385	buf := make([]byte, 64<<10)386	for {387		n, err := conRpipe.Read(buf)388		if err != nil || n == 0 {389			break390		}391		output = append(output, buf[:n]...)392	}393	close(done)394	con.Wait()395	return output, nil396}397func uploadImageToGCS(localImage, gcsImage string) error {398	GCS, err := gcs.NewClient()399	if err != nil {400		return fmt.Errorf("failed to create GCS client: %v", err)401	}402	defer GCS.Close()403	localReader, err := os.Open(localImage)404	if err != nil {405		return fmt.Errorf("failed to open image file: %v", err)406	}407	defer localReader.Close()408	localStat, err := localReader.Stat()409	if err != nil {410		return fmt.Errorf("failed to stat image file: %v", err)411	}412	gcsWriter, err := GCS.FileWriter(gcsImage)413	if err != nil {414		return fmt.Errorf("failed to upload image: %v", err)415	}416	defer gcsWriter.Close()417	gzipWriter := gzip.NewWriter(gcsWriter)418	tarWriter := tar.NewWriter(gzipWriter)419	tarHeader := &tar.Header{420		Name:     "disk.raw",421		Typeflag: tar.TypeReg,422		Mode:     0640,423		Size:     localStat.Size(),424		ModTime:  time.Now(),425		Uname:    "syzkaller",426		Gname:    "syzkaller",427	}428	setGNUFormat(tarHeader)429	if err := tarWriter.WriteHeader(tarHeader); err != nil {430		return fmt.Errorf("failed to write image tar header: %v", err)431	}432	if _, err := io.Copy(tarWriter, localReader); err != nil {433		return fmt.Errorf("failed to write image file: %v", err)434	}435	if err := tarWriter.Close(); err != nil {436		return fmt.Errorf("failed to write image file: %v", err)437	}438	if err := gzipWriter.Close(); err != nil {439		return fmt.Errorf("failed to write image file: %v", err)440	}441	if err := gcsWriter.Close(); err != nil {442		return fmt.Errorf("failed to write image file: %v", err)443	}444	return nil445}446func runCmd(debug bool, bin string, args ...string) error {447	if debug {448		log.Logf(0, "running command: %v %#v", bin, args)449	}450	output, err := osutil.RunCmd(time.Minute, "", bin, args...)451	if debug {452		log.Logf(0, "result: %v\n%s", err, output)453	}454	return err455}...

Using AI Code Generation

1import (2func main() {3 f, err := os.Open("test.txt")4 if err != nil {5 fmt.Println(err)6 }7 defer f.Close()8}

Using AI Code Generation

1import (2func main() {3 file, err := os.Open("test.txt")4 if err != nil {5 fmt.Println(err)6 }7 defer file.Close()8}

Using AI Code Generation

1import (2func main() {3	file, err = os.Open("test.txt")4	if err != nil {5		fmt.Println("Error in opening file")6	}7	defer file.Close()8	fmt.Println("File opened successfully")9}

Using AI Code Generation

1import (2func main() {3	file, err := os.Create("test.txt")4	if err != nil {5		fmt.Println(err)6	}7	fmt.Println("File created successfully")8	err = file.Close()9	if err != nil {10		fmt.Println(err)11	}12	fmt.Println("File closed successfully")13}

Using AI Code Generation

1import (2type gce struct {3}4func (gce gce) Area() int {5}6func (gce gce) Perimeter() int {7	return 2 * (gce.width + gce.height)8}9func (gce gce) Close() {10}11func main() {12	r := gce{5, 3}13	fmt.Println(r.Area())14	fmt.Println(r.Perimeter())15	r.Close()16	fmt.Println(r.Area())17	fmt.Println(r.Perimeter())18}19import (20type gce struct {21}22func (gce gce) Area() int {23}24func (gce gce) Perimeter() int {25	return 2 * (gce.width + gce.height)26}27func (gce gce) Close() {28}29func main() {30	r := gce{5, 3}31	fmt.Println(r.Area())32	fmt.Println(r.Perimeter())33	r.Close()34	fmt.Println(r.Area())35	fmt.Println(r.Perimeter())36}37import (38type gce struct {39}40func (gce gce) Area() int {41}42func (gce gce) Perimeter() int {43	return 2 * (gce.width + gce.height)44}45func (gce gce) Close() {46}47func main() {48	r := gce{5, 3}49	fmt.Println(r.Area())50	fmt.Println(r.Perimeter())51	r.Close()52	fmt.Println(r.Area())53	fmt.Println(r.Perimeter())54}55import (

Using AI Code Generation

1import (2func main() {3 c := gce.New(5, 3)4 defer c.Close()5 fmt.Println(c.Area())6}

Using AI Code Generation

1import (2func main() {3	loop := s2.LoopFromPoints([]s2.Point{4		s2.PointFromLatLng(s2.LatLngFromDegrees(0, 0)),5		s2.PointFromLatLng(s2.LatLngFromDegrees(0, 10)),6		s2.PointFromLatLng(s2.LatLngFromDegrees(10, 10)),7		s2.PointFromLatLng(s2.LatLngFromDegrees(10, 0)),8	})9	cap := s2.CapFromCenterAngle(loop.Center(), s1.Angle(0))10	cell := s2.CellFromCap(cap)11	covering := []s2.CellID{cell.ID()}12	regionCovering := s2.RegionCoveringFromCellIDs(covering)13	gce := s2.GeoCoveringFromRegionCovering(regionCovering)14	gceFromLoop := s2.GeoCoveringFromLoop(loop)15	gceFromCell := s2.GeoCoveringFromCell(cell)16	gceFromCovering := s2.GeoCoveringFromCellIDs(covering)17	gceFromRegionCovering := s2.GeoCoveringFromRegionCovering(regionCovering)18	gceFromGCE := s2.GeoCoveringFromGeoCovering(gce)19	gceFromGCEFromLoop := s2.GeoCoveringFromGeoCovering(gceFromLoop)20	gceFromGCEFromCell := s2.GeoCoveringFromGeoCovering(gceFromCell)21	gceFromGCEFromCovering := s2.GeoCoveringFromGeoCovering(gceFromCovering)

Using AI Code Generation

1import (2type gce struct {3}4func main() {5	obj := gce{1, 2}6	fmt.Println(obj)7	obj.Close()8}9func (obj gce) Close() {10	fmt.Println("closing object")11}

Using AI Code Generation

1import (2func main() {3 a.Set(10, 20)4 a.Close()5 fmt.Println(a.Get())6}

Using AI Code Generation

1import (2func main() {3	defer z01.PrintRune('\n')4	gce.Close()5}6type GCE struct{}7func (gce GCE) Close() {8	fmt.Println("Close")9}10import (11func main() {12	defer z01.PrintRune('\n')13	gce.Close()14}15type GCE struct{}16func (gce GCE) Close() {17	fmt.Println("Close")18}19import (20func main() {21	defer z01.PrintRune('\n')22	gce.Close()23}24type GCE struct{}25func (gce GCE) Close() {26	fmt.Println("Close")27}28import (29func main() {30	defer z01.PrintRune('\n')31	gce.Close()32}33type GCE struct{}34func (gce GCE) Close() {35	fmt.Println("Close")36}37import (38func main() {39	defer z01.PrintRune('\n')40	gce.Close()41}42type GCE struct{}43func (gce GCE) Close() {44	fmt.Println("Close")45}46import (47func main() {48	defer z01.PrintRune('\n')49	gce.Close()50}51type GCE struct{}52func (gce GCE) Close() {53	fmt.Println("Close")54}55import (

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