%d total builds active (Docker: %d/%d; VMs: %d/∞):", numTotal, numDocker, *maxLocalBuilds, numTotal-numDocker) io.WriteString(w, "
")
for _, st := range active {
io.WriteString(w, st.htmlStatusLine())
}
io.WriteString(w, "")
io.WriteString(w, "")
for _, st := range recent {
io.WriteString(w, st.htmlStatusLine())
}
io.WriteString(w, "")
fmt.Fprintf(w, "%s", html.EscapeString(diskFree())) } func diskFree() string { out, _ := exec.Command("df", "-h").Output() return string(out) } func handleLogs(w http.ResponseWriter, r *http.Request) { st := getStatus(builderRev{r.FormValue("name"), r.FormValue("rev")}, r.FormValue("st")) if st == nil { http.NotFound(w, r) return } w.Header().Set("Content-Type", "text/plain; charset=utf-8") io.WriteString(w, st.logs()) // TODO: if st is still building, stream them to the user with // http.Flusher.Flush and CloseNotifier and registering interest // of new writes with the buildStatus. Will require moving the // BUILDERKEY scrubbing into the Write method. } // findWorkLoop polls http://build.golang.org/?mode=json looking for new work // for the main dashboard. It does not support gccgo. // TODO(bradfitz): it also currently does not support subrepos. func findWorkLoop(work chan<- builderRev) { ticker := time.NewTicker(15 * time.Second) for { if err := findWork(work); err != nil { log.Printf("failed to find new work: %v", err) } <-ticker.C } } func findWork(work chan<- builderRev) error { var bs types.BuildStatus res, err := http.Get("https://build.golang.org/?mode=json") if err != nil { return err } defer res.Body.Close() if err := json.NewDecoder(res.Body).Decode(&bs); err != nil { return err } if res.StatusCode != 200 { return fmt.Errorf("unexpected http status %v", res.Status) } knownToDashboard := map[string]bool{} // keys are builder for _, b := range bs.Builders { knownToDashboard[b] = true } var goRevisions []string for _, br := range bs.Revisions { if br.Repo == "go" { goRevisions = append(goRevisions, br.Revision) } else { // TODO(bradfitz): support these: golang.org/issue/9506 continue } if len(br.Results) != len(bs.Builders) { return errors.New("bogus JSON response from dashboard: results is too long.") } for i, res := range br.Results { if res != "" { // It's either "ok" or a failure URL. continue } builder := bs.Builders[i] if _, ok := builders[builder]; !ok { // Not managed by the coordinator. continue } br := builderRev{bs.Builders[i], br.Revision} if !isBuilding(br) { work <- br } } } // And to bootstrap new builders, see if we have any builders // that the dashboard doesn't know about. for b := range builders { if knownToDashboard[b] { continue } for _, rev := range goRevisions { br := builderRev{b, rev} if !isBuilding(br) { work <- br } } } return nil } // builderRev is a build configuration type and a revision. type builderRev struct { name string // e.g. "linux-amd64-race" rev string // lowercase hex git hash } // returns the part after "docker run" func (conf buildConfig) dockerRunArgs(rev string) (args []string) { if key := builderKey(conf.name); key != "" { tmpKey := "/tmp/" + conf.name + ".buildkey" if _, err := os.Stat(tmpKey); err != nil { if err := ioutil.WriteFile(tmpKey, []byte(key), 0600); err != nil { log.Fatal(err) } } // Images may look for .gobuildkey in / or /root, so provide both. // TODO(adg): fix images that look in the wrong place. args = append(args, "-v", tmpKey+":/.gobuildkey") args = append(args, "-v", tmpKey+":/root/.gobuildkey") } for _, pair := range conf.env { args = append(args, "-e", pair) } args = append(args, conf.image, "/usr/local/bin/builder", "-rev="+rev, "-dashboard="+conf.dashURL, "-tool="+conf.tool, "-buildroot=/", "-v", ) if conf.cmd != "" { args = append(args, "-cmd", conf.cmd) } args = append(args, conf.name) return } func addBuilder(c buildConfig) { if c.tool == "gccgo" { // TODO(cmang,bradfitz,adg): fix gccgo return } if c.name == "" { panic("empty name") } if *addTemp { c.name += "-temp" } if _, dup := builders[c.name]; dup { panic("dup name") } if c.dashURL == "" { c.dashURL = "https://build.golang.org" } if c.tool == "" { c.tool = "go" } if strings.HasPrefix(c.name, "nacl-") { if c.image == "" { c.image = "gobuilders/linux-x86-nacl" } if c.cmd == "" { c.cmd = "/usr/local/bin/build-command.pl" } } if strings.HasPrefix(c.name, "linux-") && c.image == "" { c.image = "gobuilders/linux-x86-base" } if c.image == "" && c.vmImage == "" { panic("empty image and vmImage") } if c.image != "" && c.vmImage != "" { panic("can't specify both image and vmImage") } builders[c.name] = c } // returns the part after "docker run" func (conf watchConfig) dockerRunArgs() (args []string) { log.Printf("Running watcher with master key %q", masterKey()) if key := masterKey(); len(key) > 0 { tmpKey := "/tmp/watcher.buildkey" if _, err := os.Stat(tmpKey); err != nil { if err := ioutil.WriteFile(tmpKey, key, 0600); err != nil { log.Fatal(err) } } // Images may look for .gobuildkey in / or /root, so provide both. // TODO(adg): fix images that look in the wrong place. args = append(args, "-v", tmpKey+":/.gobuildkey") args = append(args, "-v", tmpKey+":/root/.gobuildkey") } args = append(args, "go-commit-watcher", "/usr/local/bin/watcher", "-repo="+conf.repo, "-dash="+conf.dash, "-poll="+conf.interval.String(), ) return } func addWatcher(c watchConfig) { if c.repo == "" { c.repo = "https://go.googlesource.com/go" } if c.dash == "" { c.dash = "https://build.golang.org/" } if c.interval == 0 { c.interval = 10 * time.Second } watchers[c.repo] = c } func condUpdateImage(img string) error { ii := images[img] if ii == nil { return fmt.Errorf("image %q doesn't exist", img) } ii.mu.Lock() defer ii.mu.Unlock() res, err := http.Head(ii.url) if err != nil { return fmt.Errorf("Error checking %s: %v", ii.url, err) } if res.StatusCode != 200 { return fmt.Errorf("Error checking %s: %v", ii.url, res.Status) } if res.Header.Get("Last-Modified") == ii.lastMod { return nil } res, err = http.Get(ii.url) if err != nil || res.StatusCode != 200 { return fmt.Errorf("Get after Head failed for %s: %v, %v", ii.url, err, res) } defer res.Body.Close() log.Printf("Running: docker load of %s\n", ii.url) cmd := exec.Command("docker", "load") cmd.Stdin = res.Body var out bytes.Buffer cmd.Stdout = &out cmd.Stderr = &out if cmd.Run(); err != nil { log.Printf("Failed to pull latest %s from %s and pipe into docker load: %v, %s", img, ii.url, err, out.Bytes()) return err } ii.lastMod = res.Header.Get("Last-Modified") return nil } // numDockerBuilds finds the number of go builder instances currently running. func numDockerBuilds() (n int, err error) { out, err := exec.Command("docker", "ps").Output() if err != nil { return 0, err } for _, line := range strings.Split(string(out), "\n") { if strings.Contains(line, "gobuilders/") { n++ } } return n, nil } func startBuilding(conf buildConfig, rev string) (*buildStatus, error) { if conf.usesVM() { return startBuildingInVM(conf, rev) } else { return startBuildingInDocker(conf, rev) } } func startBuildingInDocker(conf buildConfig, rev string) (*buildStatus, error) { if err := condUpdateImage(conf.image); err != nil { log.Printf("Failed to setup container for %v %v: %v", conf.name, rev, err) return nil, err } cmd := exec.Command("docker", append([]string{"run", "-d"}, conf.dockerRunArgs(rev)...)...) all, err := cmd.CombinedOutput() log.Printf("Docker run for %v %v = err:%v, output:%s", conf.name, rev, err, all) if err != nil { return nil, err } container := strings.TrimSpace(string(all)) brev := builderRev{ name: conf.name, rev: rev, } st := &buildStatus{ builderRev: brev, container: container, start: time.Now(), } log.Printf("%v now building in Docker container %v", brev, st.container) go func() { all, err := exec.Command("docker", "wait", container).CombinedOutput() output := strings.TrimSpace(string(all)) var ok bool if err == nil { exit, err := strconv.Atoi(output) ok = (err == nil && exit == 0) } st.setDone(ok) log.Printf("docker wait %s/%s: %v, %s", container, rev, err, output) donec <- builderRev{conf.name, rev} exec.Command("docker", "rm", container).Run() }() go func() { cmd := exec.Command("docker", "logs", "-f", container) cmd.Stdout = st cmd.Stderr = st if err := cmd.Run(); err != nil { // The docker logs subcommand always returns // success, even if the underlying process // fails. log.Printf("failed to follow docker logs of %s: %v", container, err) } }() return st, nil } var osArchRx = regexp.MustCompile(`^(\w+-\w+)`) // startBuildingInVM starts a VM on GCE running the buildlet binary to build rev. func startBuildingInVM(conf buildConfig, rev string) (*buildStatus, error) { brev := builderRev{ name: conf.name, rev: rev, } st := &buildStatus{ builderRev: brev, start: time.Now(), } // name is the project-wide unique name of the GCE instance. It can't be longer // than 61 bytes, so we only use the first 8 bytes of the rev. name := "buildlet-" + conf.name + "-" + rev[:8] // buildletURL is the URL of the buildlet binary which the VMs // are configured to download at boot and run. This lets us // update the buildlet more easily than rebuilding the whole // VM image. We put this URL in a well-known GCE metadata attribute. // The value will be of the form: // http://storage.googleapis.com/go-builder-data/buildlet.GOOS-GOARCH m := osArchRx.FindStringSubmatch(conf.name) if m == nil { return nil, fmt.Errorf("invalid builder name %q", conf.name) } buildletURL := "http://storage.googleapis.com/go-builder-data/buildlet." + m[1] prefix := "https://www.googleapis.com/compute/v1/projects/" + projectID machType := prefix + "/zones/" + projectZone + "/machineTypes/" + conf.MachineType() instance := &compute.Instance{ Name: name, Description: fmt.Sprintf("Go Builder building %s %s", conf.name, rev), MachineType: machType, Disks: []*compute.AttachedDisk{ { AutoDelete: true, Boot: true, Type: "PERSISTENT", InitializeParams: &compute.AttachedDiskInitializeParams{ DiskName: name, SourceImage: "https://www.googleapis.com/compute/v1/projects/" + projectID + "/global/images/" + conf.vmImage, DiskType: "https://www.googleapis.com/compute/v1/projects/" + projectID + "/zones/" + projectZone + "/diskTypes/pd-ssd", }, }, }, Tags: &compute.Tags{ // Warning: do NOT list "http-server" or "allow-ssh" (our // project's custom tag to allow ssh access) here; the // buildlet provides full remote code execution. Items: []string{}, }, Metadata: &compute.Metadata{ Items: []*compute.MetadataItems{ { Key: "buildlet-binary-url", Value: buildletURL, }, // In case the VM gets away from us (generally: if the // coordinator dies while a build is running), then we // set this attribute of when it should be killed so // we can kill it later when the coordinator is // restarted. The cleanUpOldVMs goroutine loop handles // that killing. { Key: "delete-at", Value: fmt.Sprint(time.Now().Add(30 * time.Minute).Unix()), }, }, }, NetworkInterfaces: []*compute.NetworkInterface{ &compute.NetworkInterface{ AccessConfigs: []*compute.AccessConfig{ &compute.AccessConfig{ Type: "ONE_TO_ONE_NAT", Name: "External NAT", }, }, Network: prefix + "/global/networks/default", }, }, } op, err := computeService.Instances.Insert(projectID, projectZone, instance).Do() if err != nil { return nil, fmt.Errorf("Failed to create instance: %v", err) } st.createOp = op.Name st.instName = name log.Printf("%v now building in VM %v", brev, st.instName) // Start the goroutine to monitor the VM now that it's booting. This might // take minutes for it to come up, and then even more time to do the build. go func() { err := watchVM(st) if st.hasEvent("instance_created") { deleteVM(projectZone, st.instName) } st.setDone(err == nil) if err != nil { fmt.Fprintf(st, "\n\nError: %v\n", err) } donec <- builderRev{conf.name, rev} }() return st, nil } // watchVM monitors a VM doing a build. func watchVM(st *buildStatus) (err error) { goodRes := func(res *http.Response, err error, what string) bool { if err != nil { err = fmt.Errorf("%s: %v", what, err) return false } if res.StatusCode/100 != 2 { err = fmt.Errorf("%s: %v", what, res.Status) return false } return true } st.logEventTime("instance_create_requested") // Wait for instance create operation to succeed. OpLoop: for { time.Sleep(2 * time.Second) op, err := computeService.ZoneOperations.Get(projectID, projectZone, st.createOp).Do() if err != nil { return fmt.Errorf("Failed to get op %s: %v", st.createOp, err) } switch op.Status { case "PENDING", "RUNNING": continue case "DONE": if op.Error != nil { for _, operr := range op.Error.Errors { return fmt.Errorf("Error creating instance: %+v", operr) } return errors.New("Failed to start.") } break OpLoop default: log.Fatalf("Unknown status %q: %+v", op.Status, op) } } st.logEventTime("instance_created") inst, err := computeService.Instances.Get(projectID, projectZone, st.instName).Do() if err != nil { return fmt.Errorf("Error getting instance %s details after creation: %v", st.instName, err) } st.logEventTime("got_instance_info") // Find its internal IP. var ip string for _, iface := range inst.NetworkInterfaces { if strings.HasPrefix(iface.NetworkIP, "10.") { ip = iface.NetworkIP } } if ip == "" { return errors.New("didn't find its internal IP address") } // Wait for it to boot and its buildlet to come up on port 80. st.logEventTime("waiting_for_buildlet") buildletURL := "http://" + ip const numTries = 60 var alive bool for i := 1; i <= numTries; i++ { res, err := http.Get(buildletURL) if err != nil { time.Sleep(1 * time.Second) continue } res.Body.Close() if res.StatusCode != 200 { return fmt.Errorf("buildlet returned HTTP status code %d on try number %d", res.StatusCode, i) } st.logEventTime("buildlet_up") alive = true break } if !alive { return fmt.Errorf("buildlet didn't come up in %d seconds", numTries) } // Write the VERSION file. st.logEventTime("start_write_version_tar") verReq, err := http.NewRequest("PUT", buildletURL+"/writetgz", versionTgz(st.rev)) if err != nil { return err } verRes, err := http.DefaultClient.Do(verReq) if !goodRes(verRes, err, "writing VERSION tgz") { return } // Feed the buildlet a tar file for it to extract. // TODO: cache these. st.logEventTime("start_fetch_gerrit_tgz") tarRes, err := http.Get("https://go.googlesource.com/go/+archive/" + st.rev + ".tar.gz") if !goodRes(tarRes, err, "fetching tarball from Gerrit") { return } st.logEventTime("start_write_tar") putReq, err := http.NewRequest("PUT", buildletURL+"/writetgz", tarRes.Body) if err != nil { tarRes.Body.Close() return err } putRes, err := http.DefaultClient.Do(putReq) st.logEventTime("end_write_tar") tarRes.Body.Close() if !goodRes(putRes, err, "writing tarball to buildlet") { return } // Run the builder cmd := "all.bash" if strings.HasPrefix(st.name, "windows-") { cmd = "all.bat" } else if strings.HasPrefix(st.name, "plan9-") { cmd = "all.rc" } execStartTime := time.Now() st.logEventTime("start_exec") res, err := http.PostForm(buildletURL+"/exec", url.Values{"cmd": {"src/" + cmd}}) if !goodRes(res, err, "running "+cmd) { return } defer res.Body.Close() st.logEventTime("running_exec") // Stream the output: if _, err := io.Copy(st, res.Body); err != nil { return fmt.Errorf("error copying response: %v", err) } st.logEventTime("done") state := res.Trailer.Get("Process-State") // Don't record to the dashboard unless we heard the trailer from // the buildlet, otherwise it was probably some unrelated error // (like the VM being killed, or the buildlet crashing due to // e.g. https://golang.org/issue/9309, since we require a tip // build of the buildlet to get Trailers support) if state != "" { conf := builders[st.name] var log string if state != "ok" { log = st.logs() } if err := conf.recordResult(state == "ok", st.rev, log, time.Since(execStartTime)); err != nil { return fmt.Errorf("Status was %q but failed to report it to the dashboard: %v", state, err) } } if state != "ok" { return fmt.Errorf("got Trailer process state %q", state) } return nil } type eventAndTime struct { evt string t time.Time } // buildStatus is the status of a build. type buildStatus struct { // Immutable: builderRev start time.Time container string // container ID for docker, else it's a VM // Immutable, used by VM only: createOp string // Instances.Insert operation name instName string mu sync.Mutex // guards following done time.Time // finished running succeeded bool // set when done output bytes.Buffer // stdout and stderr events []eventAndTime } func (st *buildStatus) setDone(succeeded bool) { st.mu.Lock() defer st.mu.Unlock() st.succeeded = succeeded st.done = time.Now() } func (st *buildStatus) logEventTime(event string) { st.mu.Lock() defer st.mu.Unlock() st.events = append(st.events, eventAndTime{event, time.Now()}) } func (st *buildStatus) hasEvent(event string) bool { st.mu.Lock() defer st.mu.Unlock() for _, e := range st.events { if e.evt == event { return true } } return false } // htmlStatusLine returns the HTML to show within the
block on
// the main page's list of active builds.
func (st *buildStatus) htmlStatusLine() string {
st.mu.Lock()
defer st.mu.Unlock()
urlPrefix := "https://go-review.googlesource.com/#/q/"
if strings.Contains(st.name, "gccgo") {
urlPrefix = "https://code.google.com/p/gofrontend/source/detail?r="
}
var buf bytes.Buffer
fmt.Fprintf(&buf, "%s rev %s",
st.name, urlPrefix, st.rev, st.rev)
if st.done.IsZero() {
buf.WriteString(", running")
} else if st.succeeded {
buf.WriteString(", succeeded")
} else {
buf.WriteString(", failed")
}
logsURL := fmt.Sprintf("/logs?name=%s&rev=%s&st=%p", st.name, st.rev, st)
if st.container != "" {
fmt.Fprintf(&buf, " in container %s", logsURL, st.container)
} else {
fmt.Fprintf(&buf, " in VM %s", logsURL, st.instName)
}
t := st.done
if t.IsZero() {
t = st.start
}
fmt.Fprintf(&buf, ", %v ago\n", time.Since(t))
for i, evt := range st.events {
var elapsed string
if i != 0 {
elapsed = fmt.Sprintf("+%0.1fs", evt.t.Sub(st.events[i-1].t).Seconds())
}
msg := evt.evt
if msg == "running_exec" {
msg = fmt.Sprintf("%s", logsURL, msg)
}
fmt.Fprintf(&buf, " %7s %v %s\n", elapsed, evt.t.Format(time.RFC3339), msg)
}
return buf.String()
}
func (st *buildStatus) logs() string {
st.mu.Lock()
logs := st.output.String()
st.mu.Unlock()
key := builderKey(st.name)
return strings.Replace(string(logs), key, "BUILDERKEY", -1)
}
func (st *buildStatus) Write(p []byte) (n int, err error) {
st.mu.Lock()
defer st.mu.Unlock()
const maxBufferSize = 2 << 20 // 2MB of output is way more than we expect.
plen := len(p)
if st.output.Len()+len(p) > maxBufferSize {
p = p[:maxBufferSize-st.output.Len()]
}
st.output.Write(p) // bytes.Buffer can't fail
return plen, nil
}
// Stop any previous go-commit-watcher Docker tasks, so they don't
// pile up upon restarts of the coordinator.
func stopWatchers() {
out, err := exec.Command("docker", "ps").Output()
if err != nil {
return
}
for _, line := range strings.Split(string(out), "\n") {
if !strings.Contains(line, "go-commit-watcher:") {
continue
}
f := strings.Fields(line)
exec.Command("docker", "rm", "-f", "-v", f[0]).Run()
}
}
func startWatching(conf watchConfig) (err error) {
defer func() {
if err != nil {
restartWatcherSoon(conf)
}
}()
log.Printf("Starting watcher for %v", conf.repo)
if err := condUpdateImage("go-commit-watcher"); err != nil {
log.Printf("Failed to setup container for commit watcher: %v", err)
return err
}
cmd := exec.Command("docker", append([]string{"run", "-d"}, conf.dockerRunArgs()...)...)
all, err := cmd.CombinedOutput()
if err != nil {
log.Printf("Docker run for commit watcher = err:%v, output: %s", err, all)
return err
}
container := strings.TrimSpace(string(all))
// Start a goroutine to wait for the watcher to die.
go func() {
exec.Command("docker", "wait", container).Run()
exec.Command("docker", "rm", "-v", container).Run()
log.Printf("Watcher crashed. Restarting soon.")
restartWatcherSoon(conf)
}()
return nil
}
func restartWatcherSoon(conf watchConfig) {
time.AfterFunc(30*time.Second, func() {
startWatching(conf)
})
}
func builderKey(builder string) string {
master := masterKey()
if len(master) == 0 {
return ""
}
h := hmac.New(md5.New, master)
io.WriteString(h, builder)
return fmt.Sprintf("%x", h.Sum(nil))
}
func masterKey() []byte {
keyOnce.Do(loadKey)
return masterKeyCache
}
var (
keyOnce sync.Once
masterKeyCache []byte
)
func loadKey() {
if *masterKeyFile != "" {
b, err := ioutil.ReadFile(*masterKeyFile)
if err != nil {
log.Fatal(err)
}
masterKeyCache = bytes.TrimSpace(b)
return
}
req, _ := http.NewRequest("GET", "http://metadata.google.internal/computeMetadata/v1/project/attributes/builder-master-key", nil)
req.Header.Set("Metadata-Flavor", "Google")
res, err := http.DefaultClient.Do(req)
if err != nil {
log.Fatal("No builder master key available")
}
defer res.Body.Close()
if res.StatusCode != 200 {
log.Fatalf("No builder-master-key project attribute available.")
}
slurp, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Fatal(err)
}
masterKeyCache = bytes.TrimSpace(slurp)
}
func cleanUpOldContainers() {
for {
for _, cid := range oldContainers() {
log.Printf("Cleaning old container %v", cid)
exec.Command("docker", "rm", "-v", cid).Run()
}
time.Sleep(30 * time.Second)
}
}
func oldContainers() []string {
out, _ := exec.Command("docker", "ps", "-a", "--filter=status=exited", "--no-trunc", "-q").Output()
return strings.Fields(string(out))
}
// cleanUpOldVMs loops forever and periodically enumerates virtual
// machines and deletes those which have expired.
//
// A VM is considered expired if it has a "delete-at" metadata
// attribute having a unix timestamp before the current time.
//
// This is the safety mechanism to delete VMs which stray from the
// normal deleting process. VMs are created to run a single build and
// should be shut down by a controlling process. Due to various types
// of failures, they might get stranded. To prevent them from getting
// stranded and wasting resources forever, we instead set the
// "delete-at" metadata attribute on them when created to some time
// that's well beyond their expected lifetime.
func cleanUpOldVMs() {
if computeService == nil {
return
}
for {
for _, zone := range strings.Split(*cleanZones, ",") {
zone = strings.TrimSpace(zone)
if err := cleanZoneVMs(zone); err != nil {
log.Printf("Error cleaning VMs in zone %q: %v", zone, err)
}
}
time.Sleep(time.Minute)
}
}
// cleanZoneVMs is part of cleanUpOldVMs, operating on a single zone.
func cleanZoneVMs(zone string) error {
// Fetch the first 500 (default) running instances and clean
// thoes. We expect that we'll be running many fewer than
// that. Even if we have more, eventually the first 500 will
// either end or be cleaned, and then the next call will get a
// partially-different 500.
// TODO(bradfitz): revist this code if we ever start running
// thousands of VMs.
list, err := computeService.Instances.List(projectID, zone).Do()
if err != nil {
return fmt.Errorf("listing instances: %v", err)
}
for _, inst := range list.Items {
if inst.Metadata == nil {
// Defensive. Not seen in practice.
continue
}
for _, it := range inst.Metadata.Items {
if it.Key == "delete-at" {
unixDeadline, err := strconv.ParseInt(it.Value, 10, 64)
if err != nil {
log.Printf("invalid delete-at value %q seen; ignoring", it.Value)
}
if err == nil && time.Now().Unix() > unixDeadline {
log.Printf("Deleting expired VM %q in zone %q ...", inst.Name, zone)
deleteVM(zone, inst.Name)
}
}
}
}
return nil
}
func deleteVM(zone, instName string) {
op, err := computeService.Instances.Delete(projectID, zone, instName).Do()
if err != nil {
log.Printf("Failed to delete instance %q in zone %q: %v", instName, zone, err)
return
}
log.Printf("Sent request to delete instance %q in zone %q. Operation ID == %v", instName, zone, op.Id)
}
func hasComputeScope() bool {
if !metadata.OnGCE() {
return false
}
scopes, err := metadata.Scopes("default")
if err != nil {
log.Printf("failed to query metadata default scopes: %v", err)
return false
}
for _, v := range scopes {
if v == compute.DevstorageFull_controlScope {
return true
}
}
return false
}
// dash is copied from the builder binary. It runs the given method and command on the dashboard.
//
// TODO(bradfitz,adg): unify this somewhere?
//
// If args is non-nil it is encoded as the URL query string.
// If req is non-nil it is JSON-encoded and passed as the body of the HTTP POST.
// If resp is non-nil the server's response is decoded into the value pointed
// to by resp (resp must be a pointer).
func dash(meth, cmd string, args url.Values, req, resp interface{}) error {
const builderVersion = 1 // keep in sync with dashboard/app/build/handler.go
argsCopy := url.Values{"version": {fmt.Sprint(builderVersion)}}
for k, v := range args {
if k == "version" {
panic(`dash: reserved args key: "version"`)
}
argsCopy[k] = v
}
var r *http.Response
var err error
cmd = "https://build.golang.org/" + cmd + "?" + argsCopy.Encode()
switch meth {
case "GET":
if req != nil {
log.Panicf("%s to %s with req", meth, cmd)
}
r, err = http.Get(cmd)
case "POST":
var body io.Reader
if req != nil {
b, err := json.Marshal(req)
if err != nil {
return err
}
body = bytes.NewBuffer(b)
}
r, err = http.Post(cmd, "text/json", body)
default:
log.Panicf("%s: invalid method %q", cmd, meth)
panic("invalid method: " + meth)
}
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return fmt.Errorf("bad http response: %v", r.Status)
}
body := new(bytes.Buffer)
if _, err := body.ReadFrom(r.Body); err != nil {
return err
}
// Read JSON-encoded Response into provided resp
// and return an error if present.
var result = struct {
Response interface{}
Error string
}{
// Put the provided resp in here as it can be a pointer to
// some value we should unmarshal into.
Response: resp,
}
if err = json.Unmarshal(body.Bytes(), &result); err != nil {
log.Printf("json unmarshal %#q: %s\n", body.Bytes(), err)
return err
}
if result.Error != "" {
return errors.New(result.Error)
}
return nil
}
func versionTgz(rev string) io.Reader {
var buf bytes.Buffer
zw := gzip.NewWriter(&buf)
tw := tar.NewWriter(zw)
contents := fmt.Sprintf("devel " + rev)
check(tw.WriteHeader(&tar.Header{
Name: "VERSION",
Mode: 0644,
Size: int64(len(contents)),
}))
_, err := io.WriteString(tw, contents)
check(err)
check(tw.Close())
check(zw.Close())
return bytes.NewReader(buf.Bytes())
}
// check is only for things which should be impossible (not even rare)
// to fail.
func check(err error) {
if err != nil {
panic("previously assumed to never fail: " + err.Error())
}
}