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update.go
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update.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package nsboot
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net/url"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/spf13/viper"
"golang.org/x/mod/semver"
"google.golang.org/protobuf/encoding/protojson"
"namespacelabs.dev/foundation/internal/artifacts"
"namespacelabs.dev/foundation/internal/artifacts/download"
"namespacelabs.dev/foundation/internal/artifacts/unpack"
"namespacelabs.dev/foundation/internal/cli/version"
"namespacelabs.dev/foundation/internal/cli/versioncheck"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/console/colors"
"namespacelabs.dev/foundation/internal/fnapi"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnerrors/format"
"namespacelabs.dev/foundation/internal/fnfs/tarfs"
"namespacelabs.dev/foundation/internal/workspace/dirs"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/tasks"
)
const (
updatePeriod = time.Hour * 24
versionsJson = "versions.json"
)
type NSPackage string
func (p NSPackage) Execute(ctx context.Context) error {
proc := exec.CommandContext(ctx, filepath.Join(string(p), "ns"), os.Args[1:]...)
proc.Stdin = os.Stdin
proc.Stdout = os.Stdout
proc.Stderr = os.Stderr
proc.Env = append(os.Environ(), fmt.Sprintf("NSBOOT_VERSION=%s", formatNSBootVersion()))
return proc.Run()
}
func (p NSPackage) ExecuteAndForwardExitCode(ctx context.Context, style colors.Style) {
err := p.Execute(ctx)
if err == nil {
os.Exit(0)
} else if exiterr, ok := err.(*exec.ExitError); ok {
os.Exit(exiterr.ExitCode())
} else {
format.Format(os.Stderr, err, format.WithStyle(style))
os.Exit(3)
}
}
func checkExists(cached *versionCache) (NSPackage, bool) {
if cached != nil && cached.BinaryPath != "" {
if _, err := os.Stat(cached.BinaryPath); err == nil {
return NSPackage(cached.BinaryPath), true
}
}
return "", false
}
func CheckUpdate(ctx context.Context, silent bool, currentVersion string) (*toolVersion, NSPackage, error) {
cached, needUpdate, err := loadCheckCachedMetadata(ctx, silent)
if err != nil {
return nil, "", fnerrors.New("failed to load versions.json: %w", err)
}
if cached != nil && !needUpdate {
if cached.Latest != nil && currentVersion != "" && semver.Compare(currentVersion, cached.Latest.TagName) >= 0 {
// Current version is at least as up to date as the downloaded version.
return nil, "", nil
}
if ns, ok := checkExists(cached); ok {
return cached.Latest, ns, nil
}
}
var ver *toolVersion
var ns NSPackage
updateErr := compute.Do(ctx, func(ctx context.Context) error {
var err error
ver, ns, err = performUpdate(ctx, cached, currentVersion, !needUpdate)
return err
})
return ver, ns, updateErr
}
func ForceUpdate(ctx context.Context) error {
cached, err := loadCachedMetadata()
if err != nil {
return err
}
newVersion, _, err := performUpdate(ctx, cached, "", true)
if err != nil {
return err
}
if cached != nil && cached.Latest != nil && cached.Latest.TagName == newVersion.TagName {
fmt.Fprintf(console.Stdout(ctx), "Already up-to-date at %s.\n", newVersion.TagName)
} else {
fmt.Fprintf(console.Stdout(ctx), "Updated to version %s.\n", newVersion.TagName)
}
return nil
}
func AutoUpdateEnabled() bool {
return viper.GetBool("enable_autoupdate")
}
// Loads version cache and applies default update policy.
func loadCheckCachedMetadata(ctx context.Context, silent bool) (*versionCache, bool, error) {
cache, err := loadCachedMetadata()
if err != nil {
return nil, false, err
}
if cache == nil {
return nil, false, err
}
needUpdate := cache.Latest != nil && (time.Since(cache.Latest.FetchedAt) > updatePeriod || cache.PendingVersion != "")
if needUpdate && !AutoUpdateEnabled() {
needUpdate = false
if !silent {
fmt.Fprintf(console.Stdout(ctx), "ns version is stale, but auto-update is disabled (see \"enable_autoupdate\" in config.json)\n")
}
}
return cache, needUpdate, nil
}
func performUpdate(ctx context.Context, previous *versionCache, currentVersion string, forceUpdate bool) (*toolVersion, NSPackage, error) {
// XXX store the last time timestamp checked, else after 24h we're always checking.
newVersion, err := fetchRemoteVersion(ctx)
if err != nil {
return nil, "", fnerrors.New("failed to load an update from the update service: %w", err)
}
// If the latest version is not new than the current, just use the current binary.
if currentVersion != "" && semver.Compare(currentVersion, newVersion.TagName) >= 0 {
return nil, "", nil
}
values := url.Values{}
if previous != nil && previous.Latest != nil {
serialized, _ := json.Marshal(reportedExistingVersion{
TagName: previous.Latest.TagName,
SHA256: previous.Latest.SHA256,
})
values.Add("update_from", base64.RawURLEncoding.EncodeToString(serialized))
}
if forceUpdate {
values.Add("force_update", "true")
}
path, err := fetchBinary(ctx, newVersion, values)
if err != nil {
return nil, "", fnerrors.New("failed to fetch a new tarball: %w", err)
}
// Only commit to the new version once we know that we got the new binary.
if err := persistVersion(newVersion, path); err != nil {
return nil, "", fnerrors.New("failed to persist the version cache: %w", err)
}
return newVersion, NSPackage(path), nil
}
func fetchRemoteVersion(ctx context.Context) (*toolVersion, error) {
return tasks.Return(ctx, tasks.Action("ns.version-check"), func(ctx context.Context) (*toolVersion, error) {
resp, err := fnapi.GetLatestVersion(ctx, nil)
if err != nil {
return nil, err
}
tarball := findHostTarball(resp.Tarballs)
if tarball == nil {
return nil, fnerrors.New("no tarball for host OS/architecture offered by the update service")
}
return &toolVersion{
TagName: resp.Version,
BuildTime: resp.BuildTime,
FetchedAt: time.Now(),
URL: tarball.URL,
SHA256: tarball.SHA256,
}, nil
})
}
func loadCachedMetadata() (*versionCache, error) {
cacheDir, err := dirs.Cache()
if err != nil {
return nil, err
}
bs, err := os.ReadFile(filepath.Join(cacheDir, versionsJson))
if err != nil {
if os.IsNotExist(err) {
// Missing the cache is okay.
return nil, nil
}
return nil, err
}
var cache versionCache
if err := json.Unmarshal(bs, &cache); err != nil {
return nil, err
}
return &cache, nil
}
func CheckInvalidate(ver *versioncheck.Status) (string, bool) {
cached, err := loadCachedMetadata()
if err == nil && cached != nil && cached.Latest != nil {
newVersion := semver.Compare(ver.Version, cached.Latest.TagName) > 0
if newVersion {
if err := invalidate(cached, ver.Version); err == nil {
return ver.Version, true
}
}
}
return "", false
}
func invalidate(cached *versionCache, pending string) error {
dir, err := dirs.Cache()
if err != nil {
return err
}
return rewrite(dir, versionsJson, func(w io.Writer) error {
copy := *cached
copy.PendingVersion = pending
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
return enc.Encode(copy)
})
}
func persistVersion(version *toolVersion, path string) error {
toolDir, err := dirs.Ensure(dirs.Cache())
if err != nil {
return err
}
return rewrite(toolDir, versionsJson, func(w io.Writer) error {
cache := versionCache{
Latest: version,
BinaryPath: path,
}
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
return enc.Encode(cache)
})
}
func rewrite(dir, filename string, make func(io.Writer) error) error {
newFile, err := os.CreateTemp(dir, filename)
if err != nil {
return fnerrors.InternalError("failed to create new %s: %w", filename, err)
}
writeErr := make(newFile)
// Always close before returning.
closeErr := newFile.Close()
if writeErr != nil {
return fnerrors.InternalError("failed to generate new %s: %w", filename, err)
}
if closeErr != nil {
return fnerrors.InternalError("failed to flush new %s: %w", filename, err)
}
if err := os.Rename(newFile.Name(), filepath.Join(dir, filename)); err != nil {
return fnerrors.InternalError("failed to update %s: %w", filename, err)
}
return nil
}
func fetchBinary(ctx context.Context, version *toolVersion, values url.Values) (string, error) {
tarRef := artifacts.Reference{
URL: version.URL,
Digest: schema.Digest{
Algorithm: "sha256",
Hex: version.SHA256,
},
}
fsys := unpack.Unpack("ns", tarfs.TarGunzip(download.NamespaceURL(tarRef, values)), unpack.SkipChecksumCheck())
unpacked, err := compute.GetValue(ctx, fsys)
if err != nil {
return "", err
}
return unpacked.Files, nil
}
func findHostTarball(tarballs []*fnapi.Artifact) *fnapi.Artifact {
for _, tarball := range tarballs {
goos := strings.ToLower(tarball.OS)
goarch := strings.ToLower(tarball.Arch)
if goos == runtime.GOOS && goarch == runtime.GOARCH {
return tarball
}
}
return nil
}
func formatNSBootVersion() string {
ver, err := version.Current()
if err != nil {
return fmt.Sprintf(`{"error": %q}`, err)
}
bs, err := protojson.Marshal(ver)
if err != nil {
return fmt.Sprintf(`{"error": %q}`, err)
}
return string(bs)
}