Beispiel #1
0
// ExecInCoreSnap makes sure you're executing the binary that ships in
// the core snap.
func ExecInCoreSnap() {
	if !release.OnClassic {
		// you're already the real deal, natch
		return
	}

	if !osutil.GetenvBool(key) {
		return
	}

	exe, err := os.Readlink("/proc/self/exe")
	if err != nil {
		return
	}

	full := filepath.Join(newCore, exe)
	if !osutil.FileExists(full) {
		if rev, err := os.Readlink(oldCore); err != nil {
			return
		} else if revno, err := strconv.Atoi(rev); err != nil || revno < minOldRevno {
			return
		}

		full = filepath.Join(oldCore, exe)
		if !osutil.FileExists(full) {
			return
		}
	}

	logger.Debugf("restarting into %q", full)

	env := append(os.Environ(), key+"=0")
	panic(syscall.Exec(full, os.Args, env))
}
Beispiel #2
0
// Debug sends the msg to syslog
func (l *ConsoleLog) Debug(msg string) {
	s := "DEBUG: " + msg
	l.sys.Output(3, s)

	if osutil.GetenvBool("SNAPD_DEBUG") {
		l.log.Output(3, s)
	}
}
Beispiel #3
0
// Trusted returns a copy of the current set of trusted assertions as used by Open.
func Trusted() []asserts.Assertion {
	trusted := []asserts.Assertion(nil)
	if !osutil.GetenvBool("SNAPPY_USE_STAGING_STORE") {
		trusted = append(trusted, trustedAssertions...)
	} else {
		trusted = append(trusted, trustedStagingAssertions...)
	}
	trusted = append(trusted, trustedExtraAssertions...)
	return trusted
}
Beispiel #4
0
func useStaging() bool {
	return osutil.GetenvBool("SNAPPY_USE_STAGING_STORE")
}
Beispiel #5
0
func useDeltas() bool {
	return osutil.GetenvBool("SNAPD_USE_DELTAS_EXPERIMENTAL")
}
Beispiel #6
0
func bootstrapToRootDir(sto Store, model *asserts.Model, opts *Options, local *localInfos) error {
	// FIXME: try to avoid doing this
	if opts.RootDir != "" {
		dirs.SetRootDir(opts.RootDir)
		defer dirs.SetRootDir("/")
	}

	// sanity check target
	if osutil.FileExists(dirs.SnapStateFile) {
		return fmt.Errorf("cannot bootstrap over existing system")
	}

	// TODO: developer database in home or use snapd (but need
	// a bit more API there, potential issues when crossing stores/series)
	db, err := asserts.OpenDatabase(&asserts.DatabaseConfig{
		Backstore: asserts.NewMemoryBackstore(),
		Trusted:   sysdb.Trusted(),
	})
	if err != nil {
		return err
	}
	f := makeFetcher(sto, &DownloadOptions{}, db)

	if err := f.Save(model); err != nil {
		if !osutil.GetenvBool("UBUNTU_IMAGE_SKIP_COPY_UNVERIFIED_MODEL") {
			return fmt.Errorf("cannot fetch and check prerequisites for the model assertion: %v", err)
		} else {
			logger.Noticef("Cannot fetch and check prerequisites for the model assertion, it will not be copied into the image: %v", err)
			f.addedRefs = nil
		}
	}

	// put snaps in place
	if err := os.MkdirAll(dirs.SnapBlobDir, 0755); err != nil {
		return err
	}

	snapSeedDir := filepath.Join(dirs.SnapSeedDir, "snaps")
	assertSeedDir := filepath.Join(dirs.SnapSeedDir, "assertions")
	dlOpts := &DownloadOptions{
		TargetDir: snapSeedDir,
		Channel:   opts.Channel,
		DevMode:   false, // XXX: should this be true?
	}

	for _, d := range []string{snapSeedDir, assertSeedDir} {
		if err := os.MkdirAll(d, 0755); err != nil {
			return err
		}
	}

	snaps := []string{}
	// core,kernel,gadget first
	snaps = append(snaps, local.PreferLocal(defaultCore))
	snaps = append(snaps, local.PreferLocal(model.Kernel()))
	snaps = append(snaps, local.PreferLocal(model.Gadget()))
	// then required and the user requested stuff
	for _, snapName := range model.RequiredSnaps() {
		snaps = append(snaps, local.PreferLocal(snapName))
	}
	snaps = append(snaps, opts.Snaps...)

	seen := make(map[string]bool)
	downloadedSnapsInfo := map[string]*snap.Info{}
	var seedYaml snap.Seed
	for _, snapName := range snaps {
		name := local.Name(snapName)
		if seen[name] {
			fmt.Fprintf(Stdout, "%s already prepared, skipping\n", name)
			continue
		}

		if name != snapName {
			fmt.Fprintf(Stdout, "Copying %q (%s)\n", snapName, name)
		} else {
			fmt.Fprintf(Stdout, "Fetching %s\n", snapName)
		}

		fn, info, err := acquireSnap(sto, name, dlOpts, local)
		if err != nil {
			return err
		}

		seen[name] = true

		// if it comes from the store fetch the snap assertions too
		// TODO: support somehow including available assertions
		// also for local snaps
		if info.SnapID != "" {
			err = FetchAndCheckSnapAssertions(fn, info, f, db)
			if err != nil {
				return err
			}
		}

		typ := info.Type
		// kernel/os are required for booting
		if typ == snap.TypeKernel || typ == snap.TypeOS {
			dst := filepath.Join(dirs.SnapBlobDir, filepath.Base(fn))
			if err := osutil.CopyFile(fn, dst, 0); err != nil {
				return err
			}
			// store the snap.Info for kernel/os so
			// that the bootload can DTRT
			downloadedSnapsInfo[dst] = info
		}

		// set seed.yaml
		seedYaml.Snaps = append(seedYaml.Snaps, &snap.SeedSnap{
			Name:    info.Name(),
			SnapID:  info.SnapID, // cross-ref
			Channel: info.Channel,
			File:    filepath.Base(fn),
			DevMode: info.NeedsDevMode(),
			// no assertions for this snap were put in the seed
			Unasserted: info.SnapID == "",
		})
	}

	for _, aRef := range f.addedRefs {
		var afn string
		// the names don't matter in practice as long as they don't conflict
		if aRef.Type == asserts.ModelType {
			afn = "model"
		} else {
			afn = fmt.Sprintf("%s.%s", strings.Join(aRef.PrimaryKey, ","), aRef.Type.Name)
		}
		a, err := aRef.Resolve(db.Find)
		if err != nil {
			return fmt.Errorf("internal error: lost saved assertion")
		}
		err = ioutil.WriteFile(filepath.Join(assertSeedDir, afn), asserts.Encode(a), 0644)
		if err != nil {
			return err
		}
	}

	// TODO: add the refs as an assertions list of maps section to seed.yaml

	seedFn := filepath.Join(dirs.SnapSeedDir, "seed.yaml")
	if err := seedYaml.Write(seedFn); err != nil {
		return fmt.Errorf("cannot write seed.yaml: %s", err)
	}

	// now do the bootloader stuff
	if err := partition.InstallBootConfig(opts.GadgetUnpackDir); err != nil {
		return err
	}

	if err := setBootvars(downloadedSnapsInfo); err != nil {
		return err
	}

	// and the cloud-init things
	if err := installCloudConfig(opts.GadgetUnpackDir); err != nil {
		return err
	}

	return nil
}