// Copyright (C) The Arvados Authors. All rights reserved. // // SPDX-License-Identifier: AGPL-3.0 package crunchrun import ( "bytes" "context" "encoding/json" "errors" "flag" "fmt" "io" "io/fs" "io/ioutil" "log" "net" "net/http" "os" "os/exec" "os/signal" "os/user" "path" "path/filepath" "regexp" "runtime" "runtime/pprof" "sort" "strings" "sync" "syscall" "time" "git.arvados.org/arvados.git/lib/cloud" "git.arvados.org/arvados.git/lib/cmd" "git.arvados.org/arvados.git/lib/config" "git.arvados.org/arvados.git/lib/crunchstat" "git.arvados.org/arvados.git/sdk/go/arvados" "git.arvados.org/arvados.git/sdk/go/arvadosclient" "git.arvados.org/arvados.git/sdk/go/ctxlog" "git.arvados.org/arvados.git/sdk/go/keepclient" "golang.org/x/sys/unix" ) type command struct{} var arvadosCertPath = "/etc/arvados/ca-certificates.crt" var Command = command{} // ConfigData contains environment variables and (when needed) cluster // configuration, passed from dispatchcloud to crunch-run on stdin. type ConfigData struct { Env map[string]string KeepBuffers int EC2SpotCheck bool Cluster *arvados.Cluster } // IArvadosClient is the minimal Arvados API methods used by crunch-run. type IArvadosClient interface { Create(resourceType string, parameters arvadosclient.Dict, output interface{}) error Get(resourceType string, uuid string, parameters arvadosclient.Dict, output interface{}) error Update(resourceType string, uuid string, parameters arvadosclient.Dict, output interface{}) error Call(method, resourceType, uuid, action string, parameters arvadosclient.Dict, output interface{}) error CallRaw(method string, resourceType string, uuid string, action string, parameters arvadosclient.Dict) (reader io.ReadCloser, err error) Discovery(key string) (interface{}, error) } // ErrCancelled is the error returned when the container is cancelled. var ErrCancelled = errors.New("Cancelled") // IKeepClient is the minimal Keep API methods used by crunch-run. type IKeepClient interface { BlockWrite(context.Context, arvados.BlockWriteOptions) (arvados.BlockWriteResponse, error) ReadAt(locator string, p []byte, off int) (int, error) LocalLocator(locator string) (string, error) SetStorageClasses(sc []string) } type RunArvMount func(cmdline []string, tok string) (*exec.Cmd, error) type MkTempDir func(string, string) (string, error) type PsProcess interface { CmdlineSlice() ([]string, error) } // ContainerRunner is the main stateful struct used for a single execution of a // container. type ContainerRunner struct { executor containerExecutor executorStdin io.Closer executorStdout io.Closer executorStderr io.Closer // Dispatcher client is initialized with the Dispatcher token. // This is a privileged token used to manage container status // and logs. // // We have both dispatcherClient and DispatcherArvClient // because there are two different incompatible Arvados Go // SDKs and we have to use both (hopefully this gets fixed in // #14467) dispatcherClient *arvados.Client DispatcherArvClient IArvadosClient DispatcherKeepClient IKeepClient // Container client is initialized with the Container token // This token controls the permissions of the container, and // must be used for operations such as reading collections. // // Same comment as above applies to // containerClient/ContainerArvClient. containerClient *arvados.Client ContainerArvClient IArvadosClient ContainerKeepClient IKeepClient Container arvados.Container token string ExitCode *int CrunchLog *logWriter logUUID string logMtx sync.Mutex LogCollection arvados.CollectionFileSystem LogsPDH *string RunArvMount RunArvMount MkTempDir MkTempDir ArvMount *exec.Cmd ArvMountPoint string HostOutputDir string Volumes map[string]struct{} OutputPDH *string SigChan chan os.Signal ArvMountExit chan error SecretMounts map[string]arvados.Mount MkArvClient func(token string) (IArvadosClient, IKeepClient, *arvados.Client, error) finalState string parentTemp string costStartTime time.Time keepstore *exec.Cmd keepstoreLogger io.WriteCloser keepstoreLogbuf *bufThenWrite statLogger io.WriteCloser statReporter *crunchstat.Reporter hoststatLogger io.WriteCloser hoststatReporter *crunchstat.Reporter statInterval time.Duration // What we tell docker to use as the container's cgroup // parent. setCgroupParent string // Fake root dir where crunchstat.Reporter should read OS // files, for testing. crunchstatFakeFS fs.FS cStateLock sync.Mutex cCancelled bool // StopContainer() invoked enableMemoryLimit bool enableNetwork string // one of "default" or "always" networkMode string // "none", "host", or "" -- passed through to executor brokenNodeHook string // script to run if node appears to be broken arvMountLog io.WriteCloser containerWatchdogInterval time.Duration gateway Gateway prices []cloud.InstancePrice pricesLock sync.Mutex } // setupSignals sets up signal handling to gracefully terminate the // underlying container and update state when receiving a TERM, INT or // QUIT signal. func (runner *ContainerRunner) setupSignals() { runner.SigChan = make(chan os.Signal, 1) signal.Notify(runner.SigChan, syscall.SIGTERM) signal.Notify(runner.SigChan, syscall.SIGINT) signal.Notify(runner.SigChan, syscall.SIGQUIT) go func(sig chan os.Signal) { for s := range sig { runner.stop(s) } }(runner.SigChan) } // stop the underlying container. func (runner *ContainerRunner) stop(sig os.Signal) { runner.cStateLock.Lock() defer runner.cStateLock.Unlock() if sig != nil { runner.CrunchLog.Printf("caught signal: %v", sig) } runner.cCancelled = true runner.CrunchLog.Printf("stopping container") err := runner.executor.Stop() if err != nil { runner.CrunchLog.Printf("error stopping container: %s", err) } } var errorBlacklist = []string{ "(?ms).*[Cc]annot connect to the Docker daemon.*", "(?ms).*oci runtime error.*starting container process.*container init.*mounting.*to rootfs.*no such file or directory.*", "(?ms).*grpc: the connection is unavailable.*", } func (runner *ContainerRunner) runBrokenNodeHook() { if runner.brokenNodeHook == "" { path := filepath.Join(lockdir, brokenfile) runner.CrunchLog.Printf("Writing %s to mark node as broken", path) f, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, 0700) if err != nil { runner.CrunchLog.Printf("Error writing %s: %s", path, err) return } f.Close() } else { runner.CrunchLog.Printf("Running broken node hook %q", runner.brokenNodeHook) // run killme script c := exec.Command(runner.brokenNodeHook) c.Stdout = runner.CrunchLog c.Stderr = runner.CrunchLog err := c.Run() if err != nil { runner.CrunchLog.Printf("Error running broken node hook: %v", err) } } } func (runner *ContainerRunner) checkBrokenNode(goterr error) bool { for _, d := range errorBlacklist { if m, e := regexp.MatchString(d, goterr.Error()); m && e == nil { runner.CrunchLog.Printf("Error suggests node is unable to run containers: %v", goterr) runner.runBrokenNodeHook() return true } } return false } // LoadImage determines the docker image id from the container record and // checks if it is available in the local Docker image store. If not, it loads // the image from Keep. func (runner *ContainerRunner) LoadImage() (string, error) { runner.CrunchLog.Printf("Fetching Docker image from collection '%s'", runner.Container.ContainerImage) d, err := os.Open(runner.ArvMountPoint + "/by_id/" + runner.Container.ContainerImage) if err != nil { return "", err } defer d.Close() allfiles, err := d.Readdirnames(-1) if err != nil { return "", err } var tarfiles []string for _, fnm := range allfiles { if strings.HasSuffix(fnm, ".tar") { tarfiles = append(tarfiles, fnm) } } if len(tarfiles) == 0 { return "", fmt.Errorf("image collection does not include a .tar image file") } if len(tarfiles) > 1 { return "", fmt.Errorf("cannot choose from multiple tar files in image collection: %v", tarfiles) } imageID := tarfiles[0][:len(tarfiles[0])-4] imageTarballPath := runner.ArvMountPoint + "/by_id/" + runner.Container.ContainerImage + "/" + imageID + ".tar" runner.CrunchLog.Printf("Using Docker image id %q", imageID) runner.CrunchLog.Print("Loading Docker image from keep") err = runner.executor.LoadImage(imageID, imageTarballPath, runner.Container, runner.ArvMountPoint, runner.containerClient) if err != nil { return "", err } return imageID, nil } func (runner *ContainerRunner) ArvMountCmd(cmdline []string, token string) (c *exec.Cmd, err error) { c = exec.Command(cmdline[0], cmdline[1:]...) // Copy our environment, but override ARVADOS_API_TOKEN with // the container auth token. c.Env = nil for _, s := range os.Environ() { if !strings.HasPrefix(s, "ARVADOS_API_TOKEN=") { c.Env = append(c.Env, s) } } c.Env = append(c.Env, "ARVADOS_API_TOKEN="+token) runner.arvMountLog, err = runner.openLogFile("arv-mount") if err != nil { return nil, err } scanner := logScanner{ Patterns: []string{ "Keep write error", "Block not found error", "Unhandled exception during FUSE operation", }, ReportFunc: func(pattern, text string) { runner.updateRuntimeStatus(arvadosclient.Dict{ "warning": "arv-mount: " + pattern, "warningDetail": text, }) }, } c.Stdout = runner.arvMountLog c.Stderr = io.MultiWriter(runner.arvMountLog, os.Stderr, &scanner) runner.CrunchLog.Printf("Running %v", c.Args) err = c.Start() if err != nil { return nil, err } statReadme := make(chan bool) runner.ArvMountExit = make(chan error) keepStatting := true go func() { for keepStatting { time.Sleep(100 * time.Millisecond) _, err = os.Stat(fmt.Sprintf("%s/by_id/README", runner.ArvMountPoint)) if err == nil { keepStatting = false statReadme <- true } } close(statReadme) }() go func() { mnterr := c.Wait() if mnterr != nil { runner.CrunchLog.Printf("Arv-mount exit error: %v", mnterr) } runner.ArvMountExit <- mnterr close(runner.ArvMountExit) }() select { case <-statReadme: break case err := <-runner.ArvMountExit: runner.ArvMount = nil keepStatting = false return nil, err } return c, nil } func (runner *ContainerRunner) SetupArvMountPoint(prefix string) (err error) { if runner.ArvMountPoint == "" { runner.ArvMountPoint, err = runner.MkTempDir(runner.parentTemp, prefix) } return } func copyfile(src string, dst string) (err error) { srcfile, err := os.Open(src) if err != nil { return } os.MkdirAll(path.Dir(dst), 0777) dstfile, err := os.Create(dst) if err != nil { return } _, err = io.Copy(dstfile, srcfile) if err != nil { return } err = srcfile.Close() err2 := dstfile.Close() if err != nil { return } if err2 != nil { return err2 } return nil } func (runner *ContainerRunner) SetupMounts() (map[string]bindmount, error) { bindmounts := map[string]bindmount{} err := runner.SetupArvMountPoint("keep") if err != nil { return nil, fmt.Errorf("While creating keep mount temp dir: %v", err) } token, err := runner.ContainerToken() if err != nil { return nil, fmt.Errorf("could not get container token: %s", err) } runner.CrunchLog.Printf("container token %q", token) pdhOnly := true tmpcount := 0 arvMountCmd := []string{ "arv-mount", "--foreground", "--read-write", "--storage-classes", strings.Join(runner.Container.OutputStorageClasses, ","), fmt.Sprintf("--crunchstat-interval=%v", runner.statInterval.Seconds())} if _, isdocker := runner.executor.(*dockerExecutor); isdocker { arvMountCmd = append(arvMountCmd, "--allow-other") } if runner.Container.RuntimeConstraints.KeepCacheDisk > 0 { keepcachedir, err := runner.MkTempDir(runner.parentTemp, "keepcache") if err != nil { return nil, fmt.Errorf("while creating keep cache temp dir: %v", err) } arvMountCmd = append(arvMountCmd, "--disk-cache", "--disk-cache-dir", keepcachedir, "--file-cache", fmt.Sprintf("%d", runner.Container.RuntimeConstraints.KeepCacheDisk)) } else if runner.Container.RuntimeConstraints.KeepCacheRAM > 0 { arvMountCmd = append(arvMountCmd, "--ram-cache", "--file-cache", fmt.Sprintf("%d", runner.Container.RuntimeConstraints.KeepCacheRAM)) } collectionPaths := []string{} needCertMount := true type copyFile struct { src string bind string } var copyFiles []copyFile var binds []string for bind := range runner.Container.Mounts { binds = append(binds, bind) } for bind := range runner.SecretMounts { if _, ok := runner.Container.Mounts[bind]; ok { return nil, fmt.Errorf("secret mount %q conflicts with regular mount", bind) } if runner.SecretMounts[bind].Kind != "json" && runner.SecretMounts[bind].Kind != "text" { return nil, fmt.Errorf("secret mount %q type is %q but only 'json' and 'text' are permitted", bind, runner.SecretMounts[bind].Kind) } binds = append(binds, bind) } sort.Strings(binds) for _, bind := range binds { mnt, notSecret := runner.Container.Mounts[bind] if !notSecret { mnt = runner.SecretMounts[bind] } if bind == "stdout" || bind == "stderr" { // Is it a "file" mount kind? if mnt.Kind != "file" { return nil, fmt.Errorf("unsupported mount kind '%s' for %s: only 'file' is supported", mnt.Kind, bind) } // Does path start with OutputPath? prefix := runner.Container.OutputPath if !strings.HasSuffix(prefix, "/") { prefix += "/" } if !strings.HasPrefix(mnt.Path, prefix) { return nil, fmt.Errorf("%s path does not start with OutputPath: %s, %s", strings.Title(bind), mnt.Path, prefix) } } if bind == "stdin" { // Is it a "collection" mount kind? if mnt.Kind != "collection" && mnt.Kind != "json" { return nil, fmt.Errorf("unsupported mount kind '%s' for stdin: only 'collection' and 'json' are supported", mnt.Kind) } } if bind == arvadosCertPath { needCertMount = false } if strings.HasPrefix(bind, runner.Container.OutputPath+"/") && bind != runner.Container.OutputPath+"/" { if mnt.Kind != "collection" && mnt.Kind != "text" && mnt.Kind != "json" { return nil, fmt.Errorf("only mount points of kind 'collection', 'text' or 'json' are supported underneath the output_path for %q, was %q", bind, mnt.Kind) } } switch { case mnt.Kind == "collection" && bind != "stdin": var src string if mnt.UUID != "" && mnt.PortableDataHash != "" { return nil, fmt.Errorf("cannot specify both 'uuid' and 'portable_data_hash' for a collection mount") } if mnt.UUID != "" { if mnt.Writable { return nil, fmt.Errorf("writing to existing collections currently not permitted") } pdhOnly = false src = fmt.Sprintf("%s/by_id/%s", runner.ArvMountPoint, mnt.UUID) } else if mnt.PortableDataHash != "" { if mnt.Writable && !strings.HasPrefix(bind, runner.Container.OutputPath+"/") { return nil, fmt.Errorf("can never write to a collection specified by portable data hash") } idx := strings.Index(mnt.PortableDataHash, "/") if idx > 0 { mnt.Path = path.Clean(mnt.PortableDataHash[idx:]) mnt.PortableDataHash = mnt.PortableDataHash[0:idx] runner.Container.Mounts[bind] = mnt } src = fmt.Sprintf("%s/by_id/%s", runner.ArvMountPoint, mnt.PortableDataHash) if mnt.Path != "" && mnt.Path != "." { if strings.HasPrefix(mnt.Path, "./") { mnt.Path = mnt.Path[2:] } else if strings.HasPrefix(mnt.Path, "/") { mnt.Path = mnt.Path[1:] } src += "/" + mnt.Path } } else { src = fmt.Sprintf("%s/tmp%d", runner.ArvMountPoint, tmpcount) arvMountCmd = append(arvMountCmd, "--mount-tmp", fmt.Sprintf("tmp%d", tmpcount)) tmpcount++ } if mnt.Writable { if bind == runner.Container.OutputPath { runner.HostOutputDir = src bindmounts[bind] = bindmount{HostPath: src} } else if strings.HasPrefix(bind, runner.Container.OutputPath+"/") { copyFiles = append(copyFiles, copyFile{src, runner.HostOutputDir + bind[len(runner.Container.OutputPath):]}) } else { bindmounts[bind] = bindmount{HostPath: src} } } else { bindmounts[bind] = bindmount{HostPath: src, ReadOnly: true} } collectionPaths = append(collectionPaths, src) case mnt.Kind == "tmp": var tmpdir string tmpdir, err = runner.MkTempDir(runner.parentTemp, "tmp") if err != nil { return nil, fmt.Errorf("while creating mount temp dir: %v", err) } st, staterr := os.Stat(tmpdir) if staterr != nil { return nil, fmt.Errorf("while Stat on temp dir: %v", staterr) } err = os.Chmod(tmpdir, st.Mode()|os.ModeSetgid|0777) if staterr != nil { return nil, fmt.Errorf("while Chmod temp dir: %v", err) } bindmounts[bind] = bindmount{HostPath: tmpdir} if bind == runner.Container.OutputPath { runner.HostOutputDir = tmpdir } case mnt.Kind == "json" || mnt.Kind == "text": var filedata []byte if mnt.Kind == "json" { filedata, err = json.Marshal(mnt.Content) if err != nil { return nil, fmt.Errorf("encoding json data: %v", err) } } else { text, ok := mnt.Content.(string) if !ok { return nil, fmt.Errorf("content for mount %q must be a string", bind) } filedata = []byte(text) } tmpdir, err := runner.MkTempDir(runner.parentTemp, mnt.Kind) if err != nil { return nil, fmt.Errorf("creating temp dir: %v", err) } tmpfn := filepath.Join(tmpdir, "mountdata."+mnt.Kind) err = ioutil.WriteFile(tmpfn, filedata, 0444) if err != nil { return nil, fmt.Errorf("writing temp file: %v", err) } if strings.HasPrefix(bind, runner.Container.OutputPath+"/") && (notSecret || runner.Container.Mounts[runner.Container.OutputPath].Kind != "collection") { // In most cases, if the container // specifies a literal file inside the // output path, we copy it into the // output directory (either a mounted // collection or a staging area on the // host fs). If it's a secret, it will // be skipped when copying output from // staging to Keep later. copyFiles = append(copyFiles, copyFile{tmpfn, runner.HostOutputDir + bind[len(runner.Container.OutputPath):]}) } else { // If a secret is outside OutputPath, // we bind mount the secret file // directly just like other mounts. We // also use this strategy when a // secret is inside OutputPath but // OutputPath is a live collection, to // avoid writing the secret to // Keep. Attempting to remove a // bind-mounted secret file from // inside the container will return a // "Device or resource busy" error // that might not be handled well by // the container, which is why we // don't use this strategy when // OutputPath is a staging directory. bindmounts[bind] = bindmount{HostPath: tmpfn, ReadOnly: true} } } } if runner.HostOutputDir == "" { return nil, fmt.Errorf("output path does not correspond to a writable mount point") } if needCertMount && runner.Container.RuntimeConstraints.API { for _, certfile := range []string{ // Populated by caller, or sdk/go/arvados init(), or test suite: os.Getenv("SSL_CERT_FILE"), // Copied from Go 1.21 stdlib (src/crypto/x509/root_linux.go): "/etc/ssl/certs/ca-certificates.crt", // Debian/Ubuntu/Gentoo etc. "/etc/pki/tls/certs/ca-bundle.crt", // Fedora/RHEL 6 "/etc/ssl/ca-bundle.pem", // OpenSUSE "/etc/pki/tls/cacert.pem", // OpenELEC "/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", // CentOS/RHEL 7 "/etc/ssl/cert.pem", // Alpine Linux } { if _, err := os.Stat(certfile); err == nil { bindmounts[arvadosCertPath] = bindmount{HostPath: certfile, ReadOnly: true} break } } } if pdhOnly { // If we are only mounting collections by pdh, make // sure we don't subscribe to websocket events to // avoid putting undesired load on the API server arvMountCmd = append(arvMountCmd, "--mount-by-pdh", "by_id", "--disable-event-listening") } else { arvMountCmd = append(arvMountCmd, "--mount-by-id", "by_id") } // the by_uuid mount point is used by singularity when writing // out docker images converted to SIF arvMountCmd = append(arvMountCmd, "--mount-by-id", "by_uuid") arvMountCmd = append(arvMountCmd, runner.ArvMountPoint) runner.ArvMount, err = runner.RunArvMount(arvMountCmd, token) if err != nil { return nil, fmt.Errorf("while trying to start arv-mount: %v", err) } if runner.hoststatReporter != nil && runner.ArvMount != nil { runner.hoststatReporter.ReportPID("arv-mount", runner.ArvMount.Process.Pid) } for _, p := range collectionPaths { _, err = os.Stat(p) if err != nil { return nil, fmt.Errorf("while checking that input files exist: %v", err) } } for _, cp := range copyFiles { st, err := os.Stat(cp.src) if err != nil { return nil, fmt.Errorf("while staging writable file from %q to %q: %v", cp.src, cp.bind, err) } if st.IsDir() { err = filepath.Walk(cp.src, func(walkpath string, walkinfo os.FileInfo, walkerr error) error { if walkerr != nil { return walkerr } target := path.Join(cp.bind, walkpath[len(cp.src):]) if walkinfo.Mode().IsRegular() { copyerr := copyfile(walkpath, target) if copyerr != nil { return copyerr } return os.Chmod(target, walkinfo.Mode()|0777) } else if walkinfo.Mode().IsDir() { mkerr := os.MkdirAll(target, 0777) if mkerr != nil { return mkerr } return os.Chmod(target, walkinfo.Mode()|os.ModeSetgid|0777) } else { return fmt.Errorf("source %q is not a regular file or directory", cp.src) } }) } else if st.Mode().IsRegular() { err = copyfile(cp.src, cp.bind) if err == nil { err = os.Chmod(cp.bind, st.Mode()|0777) } } if err != nil { return nil, fmt.Errorf("while staging writable file from %q to %q: %v", cp.src, cp.bind, err) } } return bindmounts, nil } func (runner *ContainerRunner) stopHoststat() error { if runner.hoststatReporter == nil { return nil } runner.hoststatReporter.Stop() runner.hoststatReporter.LogProcessMemMax(runner.CrunchLog) err := runner.hoststatLogger.Close() if err != nil { return fmt.Errorf("error closing hoststat logs: %v", err) } return nil } func (runner *ContainerRunner) startHoststat() error { var err error runner.hoststatLogger, err = runner.openLogFile("hoststat") if err != nil { return err } runner.hoststatReporter = &crunchstat.Reporter{ Logger: newLogWriter(runner.hoststatLogger), // Our own cgroup is the "host" cgroup, in the sense // that it accounts for resource usage outside the // container. It doesn't count _all_ resource usage on // the system. // // TODO?: Use the furthest ancestor of our own cgroup // that has stats available. (Currently crunchstat // does not have that capability.) Pid: os.Getpid, PollPeriod: runner.statInterval, } runner.hoststatReporter.Start() runner.hoststatReporter.ReportPID("crunch-run", os.Getpid()) return nil } func (runner *ContainerRunner) startCrunchstat() error { var err error runner.statLogger, err = runner.openLogFile("crunchstat") if err != nil { return err } runner.statReporter = &crunchstat.Reporter{ Pid: runner.executor.Pid, FS: runner.crunchstatFakeFS, Logger: newLogWriter(runner.statLogger), MemThresholds: map[string][]crunchstat.Threshold{ "rss": crunchstat.NewThresholdsFromPercentages(runner.Container.RuntimeConstraints.RAM, []int64{90, 95, 99}), }, PollPeriod: runner.statInterval, TempDir: runner.parentTemp, ThresholdLogger: runner.CrunchLog, } runner.statReporter.Start() return nil } type infoCommand struct { label string cmd []string } // LogHostInfo logs info about the current host, for debugging and // accounting purposes. Although it's logged as "node-info", this is // about the environment where crunch-run is actually running, which // might differ from what's described in the node record (see // LogNodeRecord). func (runner *ContainerRunner) LogHostInfo() (err error) { w, err := runner.openLogFile("node-info") if err != nil { return } commands := []infoCommand{ { label: "Host Information", cmd: []string{"uname", "-a"}, }, { label: "CPU Information", cmd: []string{"cat", "/proc/cpuinfo"}, }, { label: "Memory Information", cmd: []string{"cat", "/proc/meminfo"}, }, { label: "Disk Space", cmd: []string{"df", "-m", "/", os.TempDir()}, }, { label: "Disk INodes", cmd: []string{"df", "-i", "/", os.TempDir()}, }, } // Run commands with informational output to be logged. for _, command := range commands { fmt.Fprintln(w, command.label) cmd := exec.Command(command.cmd[0], command.cmd[1:]...) cmd.Stdout = w cmd.Stderr = w if err := cmd.Run(); err != nil { err = fmt.Errorf("While running command %q: %v", command.cmd, err) fmt.Fprintln(w, err) return err } fmt.Fprintln(w, "") } err = w.Close() if err != nil { return fmt.Errorf("While closing node-info logs: %v", err) } return nil } // LogContainerRecord gets and saves the raw JSON container record from the API server func (runner *ContainerRunner) LogContainerRecord() error { logged, err := runner.logAPIResponse("container", "containers", map[string]interface{}{"filters": [][]string{{"uuid", "=", runner.Container.UUID}}}) if !logged && err == nil { err = fmt.Errorf("error: no container record found for %s", runner.Container.UUID) } return err } // LogNodeRecord logs the current host's InstanceType config entry, if // running via arvados-dispatch-cloud. func (runner *ContainerRunner) LogNodeRecord() error { it := os.Getenv("InstanceType") if it == "" { // Not dispatched by arvados-dispatch-cloud. return nil } // Save InstanceType config fragment received from dispatcher // on stdin. w, err := runner.LogCollection.OpenFile("node.json", os.O_CREATE|os.O_WRONLY, 0666) if err != nil { return err } defer w.Close() _, err = io.WriteString(w, it) if err != nil { return err } return w.Close() } func (runner *ContainerRunner) logAPIResponse(label, path string, params map[string]interface{}) (logged bool, err error) { writer, err := runner.LogCollection.OpenFile(label+".json", os.O_CREATE|os.O_WRONLY, 0666) if err != nil { return false, err } reader, err := runner.DispatcherArvClient.CallRaw("GET", path, "", "", arvadosclient.Dict(params)) if err != nil { return false, fmt.Errorf("error getting %s record: %v", label, err) } defer reader.Close() dec := json.NewDecoder(reader) dec.UseNumber() var resp map[string]interface{} if err = dec.Decode(&resp); err != nil { return false, fmt.Errorf("error decoding %s list response: %v", label, err) } items, ok := resp["items"].([]interface{}) if !ok { return false, fmt.Errorf("error decoding %s list response: no \"items\" key in API list response", label) } else if len(items) < 1 { return false, nil } // Re-encode it using indentation to improve readability enc := json.NewEncoder(writer) enc.SetIndent("", " ") if err = enc.Encode(items[0]); err != nil { return false, fmt.Errorf("error logging %s record: %v", label, err) } err = writer.Close() if err != nil { return false, fmt.Errorf("error closing %s.json in log collection: %v", label, err) } return true, nil } func (runner *ContainerRunner) getStdoutFile(mntPath string) (*os.File, error) { stdoutPath := mntPath[len(runner.Container.OutputPath):] index := strings.LastIndex(stdoutPath, "/") if index > 0 { subdirs := stdoutPath[:index] if subdirs != "" { st, err := os.Stat(runner.HostOutputDir) if err != nil { return nil, fmt.Errorf("While Stat on temp dir: %v", err) } stdoutPath := filepath.Join(runner.HostOutputDir, subdirs) err = os.MkdirAll(stdoutPath, st.Mode()|os.ModeSetgid|0777) if err != nil { return nil, fmt.Errorf("While MkdirAll %q: %v", stdoutPath, err) } } } stdoutFile, err := os.Create(filepath.Join(runner.HostOutputDir, stdoutPath)) if err != nil { return nil, fmt.Errorf("While creating file %q: %v", stdoutPath, err) } return stdoutFile, nil } // CreateContainer creates the docker container. func (runner *ContainerRunner) CreateContainer(imageID string, bindmounts map[string]bindmount) error { var stdin io.Reader if mnt, ok := runner.Container.Mounts["stdin"]; ok { switch mnt.Kind { case "collection": var collID string if mnt.UUID != "" { collID = mnt.UUID } else { collID = mnt.PortableDataHash } path := runner.ArvMountPoint + "/by_id/" + collID + "/" + mnt.Path f, err := os.Open(path) if err != nil { return err } stdin = f runner.executorStdin = f case "json": j, err := json.Marshal(mnt.Content) if err != nil { return fmt.Errorf("error encoding stdin json data: %v", err) } stdin = bytes.NewReader(j) runner.executorStdin = io.NopCloser(nil) default: return fmt.Errorf("stdin mount has unsupported kind %q", mnt.Kind) } } else { stdin = bytes.NewReader(nil) runner.executorStdin = ioutil.NopCloser(nil) } var stdout, stderr io.Writer if mnt, ok := runner.Container.Mounts["stdout"]; ok { f, err := runner.getStdoutFile(mnt.Path) if err != nil { return err } stdout = f runner.executorStdout = f } else if w, err := runner.openLogFile("stdout"); err != nil { return err } else { stdout = newTimestamper(w) runner.executorStdout = w } if mnt, ok := runner.Container.Mounts["stderr"]; ok { f, err := runner.getStdoutFile(mnt.Path) if err != nil { return err } stderr = f runner.executorStderr = f } else if w, err := runner.openLogFile("stderr"); err != nil { return err } else { stderr = newTimestamper(w) runner.executorStderr = w } env := runner.Container.Environment enableNetwork := runner.enableNetwork == "always" if runner.Container.RuntimeConstraints.API { enableNetwork = true tok, err := runner.ContainerToken() if err != nil { return err } env = map[string]string{} for k, v := range runner.Container.Environment { env[k] = v } env["ARVADOS_API_TOKEN"] = tok env["ARVADOS_API_HOST"] = os.Getenv("ARVADOS_API_HOST") env["ARVADOS_API_HOST_INSECURE"] = os.Getenv("ARVADOS_API_HOST_INSECURE") env["ARVADOS_KEEP_SERVICES"] = os.Getenv("ARVADOS_KEEP_SERVICES") } workdir := runner.Container.Cwd if workdir == "." { // both "" and "." mean default workdir = "" } ram := runner.Container.RuntimeConstraints.RAM if !runner.enableMemoryLimit { ram = 0 } if runner.Container.RuntimeConstraints.CUDA.DeviceCount > 0 { nvidiaModprobe(runner.CrunchLog) } return runner.executor.Create(containerSpec{ Image: imageID, VCPUs: runner.Container.RuntimeConstraints.VCPUs, RAM: ram, WorkingDir: workdir, Env: env, BindMounts: bindmounts, Command: runner.Container.Command, EnableNetwork: enableNetwork, CUDADeviceCount: runner.Container.RuntimeConstraints.CUDA.DeviceCount, NetworkMode: runner.networkMode, CgroupParent: runner.setCgroupParent, Stdin: stdin, Stdout: stdout, Stderr: stderr, }) } // StartContainer starts the docker container created by CreateContainer. func (runner *ContainerRunner) StartContainer() error { runner.CrunchLog.Printf("Starting container") runner.cStateLock.Lock() defer runner.cStateLock.Unlock() if runner.cCancelled { return ErrCancelled } err := runner.executor.Start() if err != nil { var advice string if m, e := regexp.MatchString("(?ms).*(exec|System error).*(no such file or directory|file not found).*", err.Error()); m && e == nil { advice = fmt.Sprintf("\nPossible causes: command %q is missing, the interpreter given in #! is missing, or script has Windows line endings.", runner.Container.Command[0]) } return fmt.Errorf("could not start container: %v%s", err, advice) } return nil } // WaitFinish waits for the container to terminate, capture the exit code, and // close the stdout/stderr logging. func (runner *ContainerRunner) WaitFinish() error { runner.CrunchLog.Print("Waiting for container to finish") var timeout <-chan time.Time if s := runner.Container.SchedulingParameters.MaxRunTime; s > 0 { timeout = time.After(time.Duration(s) * time.Second) } ctx, cancel := context.WithCancel(context.Background()) defer cancel() go func() { select { case <-timeout: runner.CrunchLog.Printf("maximum run time exceeded. Stopping container.") runner.stop(nil) case <-runner.ArvMountExit: runner.CrunchLog.Printf("arv-mount exited while container is still running. Stopping container.") runner.stop(nil) case <-ctx.Done(): } }() exitcode, err := runner.executor.Wait(ctx) if err != nil { runner.checkBrokenNode(err) return err } runner.ExitCode = &exitcode extra := "" if exitcode&0x80 != 0 { // Convert raw exit status (0x80 + signal number) to a // string to log after the code, like " (signal 101)" // or " (signal 9, killed)" sig := syscall.WaitStatus(exitcode).Signal() if name := unix.SignalName(sig); name != "" { extra = fmt.Sprintf(" (signal %d, %s)", sig, name) } else { extra = fmt.Sprintf(" (signal %d)", sig) } } runner.CrunchLog.Printf("Container exited with status code %d%s", exitcode, extra) err = runner.DispatcherArvClient.Update("containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": arvadosclient.Dict{"exit_code": exitcode}, }, nil) if err != nil { runner.CrunchLog.Printf("ignoring error updating exit_code: %s", err) } var returnErr error if err = runner.executorStdin.Close(); err != nil { err = fmt.Errorf("error closing container stdin: %s", err) runner.CrunchLog.Printf("%s", err) returnErr = err } if err = runner.executorStdout.Close(); err != nil { err = fmt.Errorf("error closing container stdout: %s", err) runner.CrunchLog.Printf("%s", err) if returnErr == nil { returnErr = err } } if err = runner.executorStderr.Close(); err != nil { err = fmt.Errorf("error closing container stderr: %s", err) runner.CrunchLog.Printf("%s", err) if returnErr == nil { returnErr = err } } if runner.statReporter != nil { runner.statReporter.Stop() runner.statReporter.LogMaxima(runner.CrunchLog, map[string]int64{ "rss": runner.Container.RuntimeConstraints.RAM, }) err = runner.statLogger.Close() if err != nil { runner.CrunchLog.Printf("error closing crunchstat logs: %v", err) } } return returnErr } func (runner *ContainerRunner) updateLogs() { ticker := time.NewTicker(crunchLogUpdatePeriod / 360) defer ticker.Stop() sigusr1 := make(chan os.Signal, 1) signal.Notify(sigusr1, syscall.SIGUSR1) defer signal.Stop(sigusr1) saveAtTime := time.Now().Add(crunchLogUpdatePeriod) saveAtSize := crunchLogUpdateSize var savedSize int64 for { select { case <-ticker.C: case <-sigusr1: saveAtTime = time.Now() } runner.logMtx.Lock() done := runner.LogsPDH != nil runner.logMtx.Unlock() if done { return } size := runner.LogCollection.Size() if size == savedSize || (time.Now().Before(saveAtTime) && size < saveAtSize) { continue } saveAtTime = time.Now().Add(crunchLogUpdatePeriod) saveAtSize = runner.LogCollection.Size() + crunchLogUpdateSize saved, err := runner.saveLogCollection(false) if err != nil { runner.CrunchLog.Printf("error updating log collection: %s", err) continue } err = runner.DispatcherArvClient.Update("containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": arvadosclient.Dict{ "log": saved.PortableDataHash, }, }, nil) if err != nil { runner.CrunchLog.Printf("error updating container log to %s: %s", saved.PortableDataHash, err) continue } savedSize = size } } var spotInterruptionCheckInterval = 5 * time.Second var ec2MetadataBaseURL = "http://169.254.169.254" const ec2TokenTTL = time.Second * 21600 func (runner *ContainerRunner) checkSpotInterruptionNotices() { type ec2metadata struct { Action string `json:"action"` Time time.Time `json:"time"` } runner.CrunchLog.Printf("Checking for spot interruptions every %v using instance metadata at %s", spotInterruptionCheckInterval, ec2MetadataBaseURL) var metadata ec2metadata var token string var tokenExp time.Time check := func() error { ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Minute)) defer cancel() if token == "" || tokenExp.Sub(time.Now()) < time.Minute { req, err := http.NewRequestWithContext(ctx, http.MethodPut, ec2MetadataBaseURL+"/latest/api/token", nil) if err != nil { return err } req.Header.Set("X-aws-ec2-metadata-token-ttl-seconds", fmt.Sprintf("%d", int(ec2TokenTTL/time.Second))) resp, err := http.DefaultClient.Do(req) if err != nil { return err } defer resp.Body.Close() if resp.StatusCode != http.StatusOK { return fmt.Errorf("%s", resp.Status) } newtoken, err := ioutil.ReadAll(resp.Body) if err != nil { return err } token = strings.TrimSpace(string(newtoken)) tokenExp = time.Now().Add(ec2TokenTTL) } req, err := http.NewRequestWithContext(ctx, http.MethodGet, ec2MetadataBaseURL+"/latest/meta-data/spot/instance-action", nil) if err != nil { return err } req.Header.Set("X-aws-ec2-metadata-token", token) resp, err := http.DefaultClient.Do(req) if err != nil { return err } defer resp.Body.Close() metadata = ec2metadata{} switch resp.StatusCode { case http.StatusOK: break case http.StatusNotFound: // "If Amazon EC2 is not preparing to stop or // terminate the instance, or if you // terminated the instance yourself, // instance-action is not present in the // instance metadata and you receive an HTTP // 404 error when you try to retrieve it." return nil case http.StatusUnauthorized: token = "" return fmt.Errorf("%s", resp.Status) default: return fmt.Errorf("%s", resp.Status) } err = json.NewDecoder(resp.Body).Decode(&metadata) if err != nil { return err } return nil } failures := 0 var lastmetadata ec2metadata for range time.NewTicker(spotInterruptionCheckInterval).C { err := check() if err != nil { runner.CrunchLog.Printf("Error checking spot interruptions: %s", err) failures++ if failures > 5 { runner.CrunchLog.Printf("Giving up on checking spot interruptions after too many consecutive failures") return } continue } failures = 0 if metadata != lastmetadata { lastmetadata = metadata text := fmt.Sprintf("Cloud provider scheduled instance %s at %s", metadata.Action, metadata.Time.UTC().Format(time.RFC3339)) runner.CrunchLog.Printf("%s", text) runner.updateRuntimeStatus(arvadosclient.Dict{ "warning": "preemption notice", "warningDetail": text, "preemptionNotice": text, }) if proc, err := os.FindProcess(os.Getpid()); err == nil { // trigger updateLogs proc.Signal(syscall.SIGUSR1) } } } } func (runner *ContainerRunner) updateRuntimeStatus(status arvadosclient.Dict) { err := runner.DispatcherArvClient.Update("containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": arvadosclient.Dict{ "runtime_status": status, }, }, nil) if err != nil { runner.CrunchLog.Printf("error updating container runtime_status: %s", err) } } // CaptureOutput saves data from the container's output directory if // needed, and updates the container output accordingly. func (runner *ContainerRunner) CaptureOutput(bindmounts map[string]bindmount) error { if runner.Container.RuntimeConstraints.API { // Output may have been set directly by the container, so // refresh the container record to check. err := runner.DispatcherArvClient.Get("containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"output"}, }, &runner.Container) if err != nil { return err } if runner.Container.Output != "" { // Container output is already set. runner.OutputPDH = &runner.Container.Output return nil } } txt, err := (&copier{ client: runner.containerClient, keepClient: runner.ContainerKeepClient, hostOutputDir: runner.HostOutputDir, ctrOutputDir: runner.Container.OutputPath, globs: runner.Container.OutputGlob, bindmounts: bindmounts, mounts: runner.Container.Mounts, secretMounts: runner.SecretMounts, logger: runner.CrunchLog, }).Copy() if err != nil { return err } if n := len(regexp.MustCompile(` [0-9a-f]+\+\S*\+R`).FindAllStringIndex(txt, -1)); n > 0 { runner.CrunchLog.Printf("Copying %d data blocks from remote input collections...", n) fs, err := (&arvados.Collection{ManifestText: txt}).FileSystem(runner.containerClient, runner.ContainerKeepClient) if err != nil { return err } txt, err = fs.MarshalManifest(".") if err != nil { return err } } var resp arvados.Collection err = runner.ContainerArvClient.Create("collections", arvadosclient.Dict{ "ensure_unique_name": true, "select": []string{"portable_data_hash"}, "collection": arvadosclient.Dict{ "is_trashed": true, "name": "output for " + runner.Container.UUID, "manifest_text": txt, }, }, &resp) if err != nil { return fmt.Errorf("error creating output collection: %v", err) } runner.OutputPDH = &resp.PortableDataHash return nil } func (runner *ContainerRunner) CleanupDirs() { if runner.ArvMount != nil { var delay int64 = 8 umount := exec.Command("arv-mount", fmt.Sprintf("--unmount-timeout=%d", delay), "--unmount", runner.ArvMountPoint) umount.Stdout = runner.CrunchLog umount.Stderr = runner.CrunchLog runner.CrunchLog.Printf("Running %v", umount.Args) umnterr := umount.Start() if umnterr != nil { runner.CrunchLog.Printf("Error unmounting: %v", umnterr) runner.ArvMount.Process.Kill() } else { // If arv-mount --unmount gets stuck for any reason, we // don't want to wait for it forever. Do Wait() in a goroutine // so it doesn't block crunch-run. umountExit := make(chan error) go func() { mnterr := umount.Wait() if mnterr != nil { runner.CrunchLog.Printf("Error unmounting: %v", mnterr) } umountExit <- mnterr }() for again := true; again; { again = false select { case <-umountExit: umount = nil again = true case <-runner.ArvMountExit: break case <-time.After(time.Duration((delay + 1) * int64(time.Second))): runner.CrunchLog.Printf("Timed out waiting for unmount") if umount != nil { umount.Process.Kill() } runner.ArvMount.Process.Kill() } } } runner.ArvMount = nil } if runner.ArvMountPoint != "" { if rmerr := os.Remove(runner.ArvMountPoint); rmerr != nil { runner.CrunchLog.Printf("While cleaning up arv-mount directory %s: %v", runner.ArvMountPoint, rmerr) } runner.ArvMountPoint = "" } if rmerr := os.RemoveAll(runner.parentTemp); rmerr != nil { runner.CrunchLog.Printf("While cleaning up temporary directory %s: %v", runner.parentTemp, rmerr) } } // CommitLogs posts the collection containing the final container logs. func (runner *ContainerRunner) CommitLogs() error { func() { // Hold cStateLock to prevent races on CrunchLog (e.g., stop()). runner.cStateLock.Lock() defer runner.cStateLock.Unlock() runner.CrunchLog.Print(runner.finalState) if runner.arvMountLog != nil { runner.arvMountLog.Close() } // From now on just log to stderr, in case there are // any other further errors (such as failing to write // the log to Keep!) while shutting down runner.CrunchLog = newLogWriter(newTimestamper(newStringPrefixer(os.Stderr, runner.Container.UUID+" "))) }() if runner.keepstoreLogger != nil { // Flush any buffered logs from our local keepstore // process. Discard anything logged after this point // -- it won't end up in the log collection, so // there's no point writing it to the collectionfs. runner.keepstoreLogbuf.SetWriter(io.Discard) runner.keepstoreLogger.Close() runner.keepstoreLogger = nil } if runner.LogsPDH != nil { // If we have already assigned something to LogsPDH, // we must be closing the re-opened log, which won't // end up getting attached to the container record and // therefore doesn't need to be saved as a collection // -- it exists only to send logs to other channels. return nil } saved, err := runner.saveLogCollection(true) if err != nil { return fmt.Errorf("error saving log collection: %s", err) } runner.logMtx.Lock() defer runner.logMtx.Unlock() runner.LogsPDH = &saved.PortableDataHash return nil } // Create/update the log collection. Return value has UUID and // PortableDataHash fields populated, but others may be blank. func (runner *ContainerRunner) saveLogCollection(final bool) (response arvados.Collection, err error) { runner.logMtx.Lock() defer runner.logMtx.Unlock() if runner.LogsPDH != nil { // Already finalized. return } updates := arvadosclient.Dict{ "name": "logs for " + runner.Container.UUID, } mt, err1 := runner.LogCollection.MarshalManifest(".") if err1 == nil { // Only send updated manifest text if there was no // error. updates["manifest_text"] = mt } // Even if flushing the manifest had an error, we still want // to update the log record, if possible, to push the trash_at // and delete_at times into the future. Details on bug // #17293. if final { updates["is_trashed"] = true } else { // We set trash_at so this collection gets // automatically cleaned up eventually. It used to be // 12 hours but we had a situation where the API // server was down over a weekend but the containers // kept running such that the log collection got // trashed, so now we make it 2 weeks. refs #20378 exp := time.Now().Add(time.Duration(24*14) * time.Hour) updates["trash_at"] = exp updates["delete_at"] = exp } reqBody := arvadosclient.Dict{ "select": []string{"uuid", "portable_data_hash"}, "collection": updates, } var err2 error if runner.logUUID == "" { reqBody["ensure_unique_name"] = true err2 = runner.DispatcherArvClient.Create("collections", reqBody, &response) } else { err2 = runner.DispatcherArvClient.Update("collections", runner.logUUID, reqBody, &response) } if err2 == nil { runner.logUUID = response.UUID } if err1 != nil || err2 != nil { err = fmt.Errorf("error recording logs: %q, %q", err1, err2) } return } // UpdateContainerRunning updates the container state to "Running" func (runner *ContainerRunner) UpdateContainerRunning(logId string) error { runner.cStateLock.Lock() defer runner.cStateLock.Unlock() if runner.cCancelled { return ErrCancelled } updates := arvadosclient.Dict{ "gateway_address": runner.gateway.Address, "state": "Running", } if logId != "" { updates["log"] = logId } return runner.DispatcherArvClient.Update( "containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": updates, }, nil, ) } // ContainerToken returns the api_token the container (and any // arv-mount processes) are allowed to use. func (runner *ContainerRunner) ContainerToken() (string, error) { if runner.token != "" { return runner.token, nil } var auth arvados.APIClientAuthorization err := runner.DispatcherArvClient.Call("GET", "containers", runner.Container.UUID, "auth", nil, &auth) if err != nil { return "", err } runner.token = fmt.Sprintf("v2/%s/%s/%s", auth.UUID, auth.APIToken, runner.Container.UUID) return runner.token, nil } // UpdateContainerFinal updates the container record state on API // server to "Complete" or "Cancelled" func (runner *ContainerRunner) UpdateContainerFinal() error { update := arvadosclient.Dict{} update["state"] = runner.finalState if runner.LogsPDH != nil { update["log"] = *runner.LogsPDH } if runner.ExitCode != nil { update["exit_code"] = *runner.ExitCode } else { update["exit_code"] = nil } if runner.finalState == "Complete" && runner.OutputPDH != nil { update["output"] = *runner.OutputPDH } update["cost"] = runner.calculateCost(time.Now()) return runner.DispatcherArvClient.Update("containers", runner.Container.UUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": update, }, nil) } // IsCancelled returns the value of Cancelled, with goroutine safety. func (runner *ContainerRunner) IsCancelled() bool { runner.cStateLock.Lock() defer runner.cStateLock.Unlock() return runner.cCancelled } func (runner *ContainerRunner) openLogFile(name string) (io.WriteCloser, error) { return runner.LogCollection.OpenFile(name+".txt", os.O_CREATE|os.O_WRONLY, 0666) } // Run the full container lifecycle. func (runner *ContainerRunner) Run() (err error) { runner.CrunchLog.Printf("crunch-run %s started", cmd.Version.String()) runner.CrunchLog.Printf("%s", currentUserAndGroups()) v, _ := exec.Command("arv-mount", "--version").CombinedOutput() runner.CrunchLog.Printf("Using FUSE mount: %s", v) runner.CrunchLog.Printf("Using container runtime: %s", runner.executor.Runtime()) runner.CrunchLog.Printf("Executing container: %s", runner.Container.UUID) runner.costStartTime = time.Now() hostname, hosterr := os.Hostname() if hosterr != nil { runner.CrunchLog.Printf("Error getting hostname '%v'", hosterr) } else { runner.CrunchLog.Printf("Executing on host '%s'", hostname) } sigusr2 := make(chan os.Signal, 1) signal.Notify(sigusr2, syscall.SIGUSR2) defer signal.Stop(sigusr2) runner.loadPrices() go runner.handleSIGUSR2(sigusr2) runner.finalState = "Queued" defer func() { runner.CleanupDirs() runner.CrunchLog.Printf("crunch-run finished") }() err = runner.fetchContainerRecord() if err != nil { return } if runner.Container.State != "Locked" { return fmt.Errorf("dispatch error detected: container %q has state %q", runner.Container.UUID, runner.Container.State) } var bindmounts map[string]bindmount defer func() { // checkErr prints e (unless it's nil) and sets err to // e (unless err is already non-nil). Thus, if err // hasn't already been assigned when Run() returns, // this cleanup func will cause Run() to return the // first non-nil error that is passed to checkErr(). checkErr := func(errorIn string, e error) { if e == nil { return } runner.CrunchLog.Printf("error in %s: %v", errorIn, e) if err == nil { err = e } if runner.finalState == "Complete" { // There was an error in the finalization. runner.finalState = "Cancelled" } } // Log the error encountered in Run(), if any checkErr("Run", err) if runner.finalState == "Queued" { runner.UpdateContainerFinal() return } if runner.IsCancelled() { runner.finalState = "Cancelled" // but don't return yet -- we still want to // capture partial output and write logs } if bindmounts != nil { checkErr("CaptureOutput", runner.CaptureOutput(bindmounts)) } checkErr("stopHoststat", runner.stopHoststat()) checkErr("CommitLogs", runner.CommitLogs()) runner.CleanupDirs() checkErr("UpdateContainerFinal", runner.UpdateContainerFinal()) }() runner.setupSignals() err = runner.startHoststat() if err != nil { return } if runner.keepstore != nil { runner.hoststatReporter.ReportPID("keepstore", runner.keepstore.Process.Pid) } // set up FUSE mount and binds bindmounts, err = runner.SetupMounts() if err != nil { runner.finalState = "Cancelled" err = fmt.Errorf("While setting up mounts: %v", err) return } // check for and/or load image imageID, err := runner.LoadImage() if err != nil { if !runner.checkBrokenNode(err) { // Failed to load image but not due to a "broken node" // condition, probably user error. runner.finalState = "Cancelled" } err = fmt.Errorf("While loading container image: %v", err) return } err = runner.CreateContainer(imageID, bindmounts) if err != nil { return } err = runner.LogHostInfo() if err != nil { return } err = runner.LogNodeRecord() if err != nil { return } err = runner.LogContainerRecord() if err != nil { return } if runner.IsCancelled() { return } logCollection, err := runner.saveLogCollection(false) var logId string if err == nil { logId = logCollection.PortableDataHash } else { runner.CrunchLog.Printf("Error committing initial log collection: %v", err) } err = runner.UpdateContainerRunning(logId) if err != nil { return } runner.finalState = "Cancelled" err = runner.startCrunchstat() if err != nil { return } err = runner.StartContainer() if err != nil { runner.checkBrokenNode(err) return } err = runner.WaitFinish() if err == nil && !runner.IsCancelled() { runner.finalState = "Complete" } return } // Fetch the current container record (uuid = runner.Container.UUID) // into runner.Container. func (runner *ContainerRunner) fetchContainerRecord() error { reader, err := runner.DispatcherArvClient.CallRaw("GET", "containers", runner.Container.UUID, "", nil) if err != nil { return fmt.Errorf("error fetching container record: %v", err) } defer reader.Close() dec := json.NewDecoder(reader) dec.UseNumber() err = dec.Decode(&runner.Container) if err != nil { return fmt.Errorf("error decoding container record: %v", err) } var sm struct { SecretMounts map[string]arvados.Mount `json:"secret_mounts"` } containerToken, err := runner.ContainerToken() if err != nil { return fmt.Errorf("error getting container token: %v", err) } runner.ContainerArvClient, runner.ContainerKeepClient, runner.containerClient, err = runner.MkArvClient(containerToken) if err != nil { return fmt.Errorf("error creating container API client: %v", err) } runner.ContainerKeepClient.SetStorageClasses(runner.Container.OutputStorageClasses) runner.DispatcherKeepClient.SetStorageClasses(runner.Container.OutputStorageClasses) err = runner.ContainerArvClient.Call("GET", "containers", runner.Container.UUID, "secret_mounts", nil, &sm) if err != nil { if apierr, ok := err.(arvadosclient.APIServerError); !ok || apierr.HttpStatusCode != 404 { return fmt.Errorf("error fetching secret_mounts: %v", err) } // ok && apierr.HttpStatusCode == 404, which means // secret_mounts isn't supported by this API server. } runner.SecretMounts = sm.SecretMounts return nil } // NewContainerRunner creates a new container runner. func NewContainerRunner(dispatcherClient *arvados.Client, dispatcherArvClient IArvadosClient, dispatcherKeepClient IKeepClient, containerUUID string) (*ContainerRunner, error) { cr := &ContainerRunner{ dispatcherClient: dispatcherClient, DispatcherArvClient: dispatcherArvClient, DispatcherKeepClient: dispatcherKeepClient, } cr.RunArvMount = cr.ArvMountCmd cr.MkTempDir = ioutil.TempDir cr.MkArvClient = func(token string) (IArvadosClient, IKeepClient, *arvados.Client, error) { cl, err := arvadosclient.MakeArvadosClient() if err != nil { return nil, nil, nil, err } cl.ApiToken = token kc, err := keepclient.MakeKeepClient(cl) if err != nil { return nil, nil, nil, err } c2 := arvados.NewClientFromEnv() c2.AuthToken = token return cl, kc, c2, nil } var err error cr.LogCollection, err = (&arvados.Collection{}).FileSystem(cr.dispatcherClient, cr.DispatcherKeepClient) if err != nil { return nil, err } cr.Container.UUID = containerUUID f, err := cr.openLogFile("crunch-run") if err != nil { return nil, err } cr.CrunchLog = newLogWriter(newTimestamper(io.MultiWriter(f, newStringPrefixer(os.Stderr, cr.Container.UUID+" ")))) go cr.updateLogs() return cr, nil } func (command) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int { log := log.New(stderr, "", 0) flags := flag.NewFlagSet(prog, flag.ContinueOnError) statInterval := flags.Duration("crunchstat-interval", 10*time.Second, "sampling period for periodic resource usage reporting") flags.String("cgroup-root", "/sys/fs/cgroup", "path to sysfs cgroup tree (obsolete, ignored)") flags.String("cgroup-parent", "docker", "name of container's parent cgroup (obsolete, ignored)") cgroupParentSubsystem := flags.String("cgroup-parent-subsystem", "", "use current cgroup for given `subsystem` as parent cgroup for container (subsystem argument is only relevant for cgroups v1; in cgroups v2 / unified mode, any non-empty value means use current cgroup); if empty, use the docker daemon's default cgroup parent. See https://doc.arvados.org/install/crunch2-slurm/install-dispatch.html#CrunchRunCommand-cgroups") caCertsPath := flags.String("ca-certs", "", "Path to TLS root certificates") detach := flags.Bool("detach", false, "Detach from parent process and run in the background") stdinConfig := flags.Bool("stdin-config", false, "Load config and environment variables from JSON message on stdin") configFile := flags.String("config", arvados.DefaultConfigFile, "filename of cluster config file to try loading if -stdin-config=false (default is $ARVADOS_CONFIG)") sleep := flags.Duration("sleep", 0, "Delay before starting (testing use only)") kill := flags.Int("kill", -1, "Send signal to an existing crunch-run process for given UUID") list := flags.Bool("list", false, "List UUIDs of existing crunch-run processes (and notify them to use price data passed on stdin)") enableMemoryLimit := flags.Bool("enable-memory-limit", true, "tell container runtime to limit container's memory usage") enableNetwork := flags.String("container-enable-networking", "default", "enable networking \"always\" (for all containers) or \"default\" (for containers that request it)") networkMode := flags.String("container-network-mode", "default", `Docker network mode for container (use any argument valid for docker --net)`) memprofile := flags.String("memprofile", "", "write memory profile to `file` after running container") runtimeEngine := flags.String("runtime-engine", "docker", "container runtime: docker or singularity") brokenNodeHook := flags.String("broken-node-hook", "", "script to run if node is detected to be broken (for example, Docker daemon is not running)") flags.Duration("check-containerd", 0, "Ignored. Exists for compatibility with older versions.") version := flags.Bool("version", false, "Write version information to stdout and exit 0.") ignoreDetachFlag := false if len(args) > 0 && args[0] == "-no-detach" { // This process was invoked by a parent process, which // has passed along its own arguments, including // -detach, after the leading -no-detach flag. Strip // the leading -no-detach flag (it's not recognized by // flags.Parse()) and ignore the -detach flag that // comes later. args = args[1:] ignoreDetachFlag = true } if ok, code := cmd.ParseFlags(flags, prog, args, "container-uuid", stderr); !ok { return code } else if *version { fmt.Fprintln(stdout, prog, cmd.Version.String()) return 0 } else if !*list && flags.NArg() != 1 { fmt.Fprintf(stderr, "missing required argument: container-uuid (try -help)\n") return 2 } containerUUID := flags.Arg(0) switch { case *detach && !ignoreDetachFlag: return Detach(containerUUID, prog, args, stdin, stdout, stderr) case *kill >= 0: return KillProcess(containerUUID, syscall.Signal(*kill), stdout, stderr) case *list: return ListProcesses(stdin, stdout, stderr) } if len(containerUUID) != 27 { log.Printf("usage: %s [options] UUID", prog) return 1 } var keepstoreLogbuf bufThenWrite var conf ConfigData if *stdinConfig { err := json.NewDecoder(stdin).Decode(&conf) if err != nil { log.Printf("decode stdin: %s", err) return 1 } for k, v := range conf.Env { err = os.Setenv(k, v) if err != nil { log.Printf("setenv(%q): %s", k, err) return 1 } } if conf.Cluster != nil { // ClusterID is missing from the JSON // representation, but we need it to generate // a valid config file for keepstore, so we // fill it using the container UUID prefix. conf.Cluster.ClusterID = containerUUID[:5] } } else { conf = hpcConfData(containerUUID, *configFile, io.MultiWriter(&keepstoreLogbuf, stderr)) } log.Printf("crunch-run %s started", cmd.Version.String()) time.Sleep(*sleep) if *caCertsPath != "" { os.Setenv("SSL_CERT_FILE", *caCertsPath) } keepstore, err := startLocalKeepstore(conf, io.MultiWriter(&keepstoreLogbuf, stderr)) if err != nil { log.Print(err) return 1 } if keepstore != nil { defer keepstore.Process.Kill() } api, err := arvadosclient.MakeArvadosClient() if err != nil { log.Printf("%s: %v", containerUUID, err) return 1 } // arvadosclient now interprets Retries=10 to mean // Timeout=10m, retrying with exponential backoff + jitter. api.Retries = 10 kc, err := keepclient.MakeKeepClient(api) if err != nil { log.Printf("%s: %v", containerUUID, err) return 1 } kc.Retries = 4 cr, err := NewContainerRunner(arvados.NewClientFromEnv(), api, kc, containerUUID) if err != nil { log.Print(err) return 1 } cr.keepstore = keepstore if keepstore == nil { // Log explanation (if any) for why we're not running // a local keepstore. var buf bytes.Buffer keepstoreLogbuf.SetWriter(&buf) if buf.Len() > 0 { cr.CrunchLog.Printf("%s", strings.TrimSpace(buf.String())) } } else if logWhat := conf.Cluster.Containers.LocalKeepLogsToContainerLog; logWhat == "none" { cr.CrunchLog.Printf("using local keepstore process (pid %d) at %s", keepstore.Process.Pid, os.Getenv("ARVADOS_KEEP_SERVICES")) keepstoreLogbuf.SetWriter(io.Discard) } else { cr.CrunchLog.Printf("using local keepstore process (pid %d) at %s, writing logs to keepstore.txt in log collection", keepstore.Process.Pid, os.Getenv("ARVADOS_KEEP_SERVICES")) cr.keepstoreLogger, err = cr.openLogFile("keepstore") if err != nil { log.Print(err) return 1 } var writer io.WriteCloser = cr.keepstoreLogger if logWhat == "errors" { writer = &filterKeepstoreErrorsOnly{WriteCloser: writer} } else if logWhat != "all" { // should have been caught earlier by // dispatcher's config loader log.Printf("invalid value for Containers.LocalKeepLogsToContainerLog: %q", logWhat) return 1 } err = keepstoreLogbuf.SetWriter(writer) if err != nil { log.Print(err) return 1 } cr.keepstoreLogbuf = &keepstoreLogbuf } switch *runtimeEngine { case "docker": cr.executor, err = newDockerExecutor(containerUUID, cr.CrunchLog.Printf, cr.containerWatchdogInterval) case "singularity": cr.executor, err = newSingularityExecutor(cr.CrunchLog.Printf) default: cr.CrunchLog.Printf("%s: unsupported RuntimeEngine %q", containerUUID, *runtimeEngine) return 1 } if err != nil { cr.CrunchLog.Printf("%s: %v", containerUUID, err) cr.checkBrokenNode(err) return 1 } defer cr.executor.Close() cr.brokenNodeHook = *brokenNodeHook gwAuthSecret := os.Getenv("GatewayAuthSecret") os.Unsetenv("GatewayAuthSecret") if gwAuthSecret == "" { // not safe to run a gateway service without an auth // secret cr.CrunchLog.Printf("Not starting a gateway server (GatewayAuthSecret was not provided by dispatcher)") } else { gwListen := os.Getenv("GatewayAddress") cr.gateway = Gateway{ Address: gwListen, AuthSecret: gwAuthSecret, ContainerUUID: containerUUID, Target: cr.executor, Log: cr.CrunchLog, LogCollection: cr.LogCollection, } if gwListen == "" { // Direct connection won't work, so we use the // gateway_address field to indicate the // internalURL of the controller process that // has the current tunnel connection. cr.gateway.ArvadosClient = cr.dispatcherClient cr.gateway.UpdateTunnelURL = func(url string) { cr.gateway.Address = "tunnel " + url cr.DispatcherArvClient.Update("containers", containerUUID, arvadosclient.Dict{ "select": []string{"uuid"}, "container": arvadosclient.Dict{"gateway_address": cr.gateway.Address}, }, nil) } } err = cr.gateway.Start() if err != nil { log.Printf("error starting gateway server: %s", err) return 1 } } parentTemp, tmperr := cr.MkTempDir("", "crunch-run."+containerUUID+".") if tmperr != nil { log.Printf("%s: %v", containerUUID, tmperr) return 1 } cr.parentTemp = parentTemp cr.statInterval = *statInterval cr.enableMemoryLimit = *enableMemoryLimit cr.enableNetwork = *enableNetwork cr.networkMode = *networkMode if *cgroupParentSubsystem != "" { p, err := findCgroup(os.DirFS("/"), *cgroupParentSubsystem) if err != nil { log.Printf("fatal: cgroup parent subsystem: %s", err) return 1 } cr.setCgroupParent = p } if conf.EC2SpotCheck { go cr.checkSpotInterruptionNotices() } runerr := cr.Run() if *memprofile != "" { f, err := os.Create(*memprofile) if err != nil { log.Printf("could not create memory profile: %s", err) } runtime.GC() // get up-to-date statistics if err := pprof.WriteHeapProfile(f); err != nil { log.Printf("could not write memory profile: %s", err) } closeerr := f.Close() if closeerr != nil { log.Printf("closing memprofile file: %s", err) } } if runerr != nil { log.Printf("%s: %v", containerUUID, runerr) return 1 } return 0 } // Try to load ConfigData in hpc (slurm/lsf) environment. This means // loading the cluster config from the specified file and (if that // works) getting the runtime_constraints container field from // controller to determine # VCPUs so we can calculate KeepBuffers. func hpcConfData(uuid string, configFile string, stderr io.Writer) ConfigData { var conf ConfigData conf.Cluster = loadClusterConfigFile(configFile, stderr) if conf.Cluster == nil { // skip loading the container record -- we won't be // able to start local keepstore anyway. return conf } arv, err := arvadosclient.MakeArvadosClient() if err != nil { fmt.Fprintf(stderr, "error setting up arvadosclient: %s\n", err) return conf } // arvadosclient now interprets Retries=10 to mean // Timeout=10m, retrying with exponential backoff + jitter. arv.Retries = 10 var ctr arvados.Container err = arv.Call("GET", "containers", uuid, "", arvadosclient.Dict{"select": []string{"runtime_constraints"}}, &ctr) if err != nil { fmt.Fprintf(stderr, "error getting container record: %s\n", err) return conf } if ctr.RuntimeConstraints.VCPUs > 0 { conf.KeepBuffers = ctr.RuntimeConstraints.VCPUs * conf.Cluster.Containers.LocalKeepBlobBuffersPerVCPU } return conf } // Load cluster config file from given path. If an error occurs, log // the error to stderr and return nil. func loadClusterConfigFile(path string, stderr io.Writer) *arvados.Cluster { ldr := config.NewLoader(&bytes.Buffer{}, ctxlog.New(stderr, "plain", "info")) ldr.Path = path cfg, err := ldr.Load() if err != nil { fmt.Fprintf(stderr, "could not load config file %s: %s\n", path, err) return nil } cluster, err := cfg.GetCluster("") if err != nil { fmt.Fprintf(stderr, "could not use config file %s: %s\n", path, err) return nil } fmt.Fprintf(stderr, "loaded config file %s\n", path) return cluster } func startLocalKeepstore(configData ConfigData, logbuf io.Writer) (*exec.Cmd, error) { if configData.KeepBuffers < 1 { fmt.Fprintf(logbuf, "not starting a local keepstore process because KeepBuffers=%v in config\n", configData.KeepBuffers) return nil, nil } if configData.Cluster == nil { fmt.Fprint(logbuf, "not starting a local keepstore process because cluster config file was not loaded\n") return nil, nil } for uuid, vol := range configData.Cluster.Volumes { if len(vol.AccessViaHosts) > 0 { fmt.Fprintf(logbuf, "not starting a local keepstore process because a volume (%s) uses AccessViaHosts\n", uuid) return nil, nil } if !vol.ReadOnly && vol.Replication < configData.Cluster.Collections.DefaultReplication { fmt.Fprintf(logbuf, "not starting a local keepstore process because a writable volume (%s) has replication less than Collections.DefaultReplication (%d < %d)\n", uuid, vol.Replication, configData.Cluster.Collections.DefaultReplication) return nil, nil } } // Rather than have an alternate way to tell keepstore how // many buffers to use, etc., when starting it this way, we // just modify the cluster configuration that we feed it on // stdin. ccfg := *configData.Cluster ccfg.API.MaxKeepBlobBuffers = configData.KeepBuffers ccfg.Collections.BlobTrash = false ccfg.Collections.BlobTrashConcurrency = 0 ccfg.Collections.BlobDeleteConcurrency = 0 localaddr := localKeepstoreAddr() ln, err := net.Listen("tcp", net.JoinHostPort(localaddr, "0")) if err != nil { return nil, err } _, port, err := net.SplitHostPort(ln.Addr().String()) if err != nil { ln.Close() return nil, err } ln.Close() url := "http://" + net.JoinHostPort(localaddr, port) fmt.Fprintf(logbuf, "starting keepstore on %s\n", url) var confJSON bytes.Buffer err = json.NewEncoder(&confJSON).Encode(arvados.Config{ Clusters: map[string]arvados.Cluster{ ccfg.ClusterID: ccfg, }, }) if err != nil { return nil, err } cmd := exec.Command("/proc/self/exe", "keepstore", "-config=-") if target, err := os.Readlink(cmd.Path); err == nil && strings.HasSuffix(target, ".test") { // If we're a 'go test' process, running // /proc/self/exe would start the test suite in a // child process, which is not what we want. cmd.Path, _ = exec.LookPath("go") cmd.Args = append([]string{"go", "run", "../../cmd/arvados-server"}, cmd.Args[1:]...) cmd.Env = os.Environ() } cmd.Stdin = &confJSON cmd.Stdout = logbuf cmd.Stderr = logbuf cmd.Env = append(cmd.Env, "GOGC=10", "ARVADOS_SERVICE_INTERNAL_URL="+url) err = cmd.Start() if err != nil { return nil, fmt.Errorf("error starting keepstore process: %w", err) } cmdExited := false go func() { cmd.Wait() cmdExited = true }() ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(time.Second*10)) defer cancel() poll := time.NewTicker(time.Second / 10) defer poll.Stop() client := http.Client{} for range poll.C { testReq, err := http.NewRequestWithContext(ctx, "GET", url+"/_health/ping", nil) testReq.Header.Set("Authorization", "Bearer "+configData.Cluster.ManagementToken) if err != nil { return nil, err } resp, err := client.Do(testReq) if err == nil { resp.Body.Close() if resp.StatusCode == http.StatusOK { break } } if cmdExited { return nil, fmt.Errorf("keepstore child process exited") } if ctx.Err() != nil { return nil, fmt.Errorf("timed out waiting for new keepstore process to report healthy") } } os.Setenv("ARVADOS_KEEP_SERVICES", url) return cmd, nil } // return current uid, gid, groups in a format suitable for logging: // "crunch-run process has uid=1234(arvados) gid=1234(arvados) // groups=1234(arvados),114(fuse)" func currentUserAndGroups() string { u, err := user.Current() if err != nil { return fmt.Sprintf("error getting current user ID: %s", err) } s := fmt.Sprintf("crunch-run process has uid=%s(%s) gid=%s", u.Uid, u.Username, u.Gid) if g, err := user.LookupGroupId(u.Gid); err == nil { s += fmt.Sprintf("(%s)", g.Name) } s += " groups=" if gids, err := u.GroupIds(); err == nil { for i, gid := range gids { if i > 0 { s += "," } s += gid if g, err := user.LookupGroupId(gid); err == nil { s += fmt.Sprintf("(%s)", g.Name) } } } return s } // Return a suitable local interface address for a local keepstore // service. Currently this is the numerically lowest non-loopback ipv4 // address assigned to a local interface that is not in any of the // link-local/vpn/loopback ranges 169.254/16, 100.64/10, or 127/8. func localKeepstoreAddr() string { var ips []net.IP // Ignore error (proceed with zero IPs) addrs, _ := processIPs(os.Getpid()) for addr := range addrs { ip := net.ParseIP(addr) if ip == nil { // invalid continue } if ip.Mask(net.CIDRMask(8, 32)).Equal(net.IPv4(127, 0, 0, 0)) || ip.Mask(net.CIDRMask(10, 32)).Equal(net.IPv4(100, 64, 0, 0)) || ip.Mask(net.CIDRMask(16, 32)).Equal(net.IPv4(169, 254, 0, 0)) { // unsuitable continue } ips = append(ips, ip) } if len(ips) == 0 { return "0.0.0.0" } sort.Slice(ips, func(ii, jj int) bool { i, j := ips[ii], ips[jj] if len(i) != len(j) { return len(i) < len(j) } for x := range i { if i[x] != j[x] { return i[x] < j[x] } } return false }) return ips[0].String() } func (cr *ContainerRunner) loadPrices() { buf, err := os.ReadFile(filepath.Join(lockdir, pricesfile)) if err != nil { if !os.IsNotExist(err) { cr.CrunchLog.Printf("loadPrices: read: %s", err) } return } var prices []cloud.InstancePrice err = json.Unmarshal(buf, &prices) if err != nil { cr.CrunchLog.Printf("loadPrices: decode: %s", err) return } cr.pricesLock.Lock() defer cr.pricesLock.Unlock() var lastKnown time.Time if len(cr.prices) > 0 { lastKnown = cr.prices[0].StartTime } cr.prices = cloud.NormalizePriceHistory(append(prices, cr.prices...)) for i := len(cr.prices) - 1; i >= 0; i-- { price := cr.prices[i] if price.StartTime.After(lastKnown) { cr.CrunchLog.Printf("Instance price changed to %#.3g at %s", price.Price, price.StartTime.UTC()) } } } func (cr *ContainerRunner) calculateCost(now time.Time) float64 { cr.pricesLock.Lock() defer cr.pricesLock.Unlock() // First, make a "prices" slice with the real data as far back // as it goes, and (if needed) a "since the beginning of time" // placeholder containing a reasonable guess about what the // price was between cr.costStartTime and the earliest real // data point. prices := cr.prices if len(prices) == 0 { // use price info in InstanceType record initially // provided by cloud dispatcher var p float64 var it arvados.InstanceType if j := os.Getenv("InstanceType"); j != "" && json.Unmarshal([]byte(j), &it) == nil && it.Price > 0 { p = it.Price } prices = []cloud.InstancePrice{{Price: p}} } else if prices[len(prices)-1].StartTime.After(cr.costStartTime) { // guess earlier pricing was the same as the earliest // price we know about filler := prices[len(prices)-1] filler.StartTime = time.Time{} prices = append(prices, filler) } // Now that our history of price changes goes back at least as // far as cr.costStartTime, add up the costs for each // interval. cost := 0.0 spanEnd := now for _, ip := range prices { spanStart := ip.StartTime if spanStart.After(now) { // pricing information from the future -- not // expected from AWS, but possible in // principle, and exercised by tests. continue } last := false if spanStart.Before(cr.costStartTime) { spanStart = cr.costStartTime last = true } cost += ip.Price * spanEnd.Sub(spanStart).Seconds() / 3600 if last { break } spanEnd = spanStart } return cost } func (runner *ContainerRunner) handleSIGUSR2(sigchan chan os.Signal) { for range sigchan { runner.loadPrices() update := arvadosclient.Dict{ "select": []string{"uuid"}, "container": arvadosclient.Dict{ "cost": runner.calculateCost(time.Now()), }, } runner.DispatcherArvClient.Update("containers", runner.Container.UUID, update, nil) } }