diff --git a/third_party/closure/updatelibrary.go b/third_party/closure/updatelibrary.go
new file mode 100644
index 000000000..3aeaed093
--- /dev/null
+++ b/third_party/closure/updatelibrary.go
@@ -0,0 +1,363 @@
+/*
+Copyright 2013 The Camlistore Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// The updatelibrary command allows to selectively download
+// from the closure library git repository (at a chosen revision)
+// the resources needed by the Camlistore ui.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"camlistore.org/pkg/osutil"
+)
+
+const (
+	gitRepo = "https://code.google.com/p/closure-library/"
+	gitHash = "1389e13"
+)
+
+// fileList is the list of resources from the closure library that
+// are required by the ui pages of Camlistore. It was generated
+// from the error messages given in the javascript console.
+// TODO(mpl): Better way to do that generation.
+// See http://camlistore.org/issue/149
+var fileList = []string{
+	"AUTHORS",
+	"LICENSE",
+	"README",
+	"closure/goog/a11y/aria/announcer.js",
+	"closure/goog/a11y/aria/aria.js",
+	"closure/goog/array/array.js",
+	"closure/goog/asserts/asserts.js",
+	"closure/goog/base.js",
+	"closure/goog/css/common.css",
+	"closure/goog/css/toolbar.css",
+	"closure/goog/debug/debug.js",
+	"closure/goog/debug/entrypointregistry.js",
+	"closure/goog/debug/errorhandler.js",
+	"closure/goog/debug/errorhandlerweakdep.js",
+	"closure/goog/debug/error.js",
+	"closure/goog/debug/logbuffer.js",
+	"closure/goog/debug/logger.js",
+	"closure/goog/debug/logrecord.js",
+	"closure/goog/debug/tracer.js",
+	"closure/goog/deps.js",
+	"closure/goog/dom/a11y.js",
+	"closure/goog/dom/browserfeature.js",
+	"closure/goog/dom/classes.js",
+	"closure/goog/dom/dom.js",
+	"closure/goog/dom/tagname.js",
+	"closure/goog/dom/vendor.js",
+	"closure/goog/disposable/disposable.js",
+	"closure/goog/disposable/idisposable.js",
+	"closure/goog/events/browserevent.js",
+	"closure/goog/events/browserfeature.js",
+	"closure/goog/events/eventhandler.js",
+	"closure/goog/events/event.js",
+	"closure/goog/events/events.js",
+	"closure/goog/events/eventtarget.js",
+	"closure/goog/events/eventtype.js",
+	"closure/goog/events/eventwrapper.js",
+	"closure/goog/events/filedrophandler.js",
+	"closure/goog/events/keycodes.js",
+	"closure/goog/events/keyhandler.js",
+	"closure/goog/events/listenable.js",
+	"closure/goog/events/listener.js",
+	"closure/goog/fx/transition.js",
+	"closure/goog/iter/iter.js",
+	"closure/goog/json/json.js",
+	"closure/goog/math/box.js",
+	"closure/goog/math/coordinate.js",
+	"closure/goog/math/math.js",
+	"closure/goog/math/rect.js",
+	"closure/goog/math/size.js",
+	"closure/goog/net/errorcode.js",
+	"closure/goog/net/eventtype.js",
+	"closure/goog/net/httpstatus.js",
+	"closure/goog/net/wrapperxmlhttpfactory.js",
+	"closure/goog/net/xhrio.js",
+	"closure/goog/net/xmlhttpfactory.js",
+	"closure/goog/net/xmlhttp.js",
+	"closure/goog/object/object.js",
+	"closure/goog/positioning/abstractposition.js",
+	"closure/goog/positioning/anchoredposition.js",
+	"closure/goog/positioning/anchoredviewportposition.js",
+	"closure/goog/positioning/clientposition.js",
+	"closure/goog/positioning/menuanchoredposition.js",
+	"closure/goog/positioning/positioning.js",
+	"closure/goog/positioning/viewportclientposition.js",
+	"closure/goog/reflect/reflect.js",
+	"closure/goog/string/string.js",
+	"closure/goog/structs/collection.js",
+	"closure/goog/structs/map.js",
+	"closure/goog/structs/set.js",
+	"closure/goog/structs/simplepool.js",
+	"closure/goog/structs/structs.js",
+	"closure/goog/style/bidi.js",
+	"closure/goog/style/style.js",
+	"closure/goog/timer/timer.js",
+	"closure/goog/ui/button.js",
+	"closure/goog/ui/buttonrenderer.js",
+	"closure/goog/ui/buttonside.js",
+	"closure/goog/ui/component.js",
+	"closure/goog/ui/container.js",
+	"closure/goog/ui/containerrenderer.js",
+	"closure/goog/ui/controlcontent.js",
+	"closure/goog/ui/control.js",
+	"closure/goog/ui/controlrenderer.js",
+	"closure/goog/ui/cssnames.js",
+	"closure/goog/ui/custombuttonrenderer.js",
+	"closure/goog/ui/decorate.js",
+	"closure/goog/ui/idgenerator.js",
+	"closure/goog/ui/menubutton.js",
+	"closure/goog/ui/menubuttonrenderer.js",
+	"closure/goog/ui/menuheader.js",
+	"closure/goog/ui/menuheaderrenderer.js",
+	"closure/goog/ui/menuitem.js",
+	"closure/goog/ui/menuitemrenderer.js",
+	"closure/goog/ui/menu.js",
+	"closure/goog/ui/menurenderer.js",
+	"closure/goog/ui/menuseparator.js",
+	"closure/goog/ui/menuseparatorrenderer.js",
+	"closure/goog/ui/nativebuttonrenderer.js",
+	"closure/goog/ui/popupbase.js",
+	"closure/goog/ui/popupmenu.js",
+	"closure/goog/ui/registry.js",
+	"closure/goog/ui/separator.js",
+	"closure/goog/ui/textarea.js",
+	"closure/goog/ui/textarearenderer.js",
+	"closure/goog/ui/toolbarbutton.js",
+	"closure/goog/ui/toolbarbuttonrenderer.js",
+	"closure/goog/ui/toolbar.js",
+	"closure/goog/ui/toolbarmenubutton.js",
+	"closure/goog/ui/toolbarmenubuttonrenderer.js",
+	"closure/goog/ui/toolbarrenderer.js",
+	"closure/goog/ui/toolbarseparatorrenderer.js",
+	"closure/goog/uri/uri.js",
+	"closure/goog/uri/utils.js",
+	"closure/goog/useragent/product.js",
+	"closure/goog/useragent/useragent.js",
+}
+
+var (
+	currentRevCmd  = newCmd("git", "rev-parse", "--short", "HEAD")
+	gitFetchCmd    = newCmd("git", "fetch")
+	gitResetCmd    = newCmd("git", "reset", gitHash)
+	gitCloneCmd    = newCmd("git", "clone", "-n", gitRepo, ".")
+	gitCheckoutCmd = newCmd("git", "checkout", "HEAD")
+)
+
+var (
+	verbose       bool
+	closureGitDir string // where we do the cloning/updating: camliRoot + tmp/closure-lib/
+	destDir       string // install dir: camliRoot + third_party/closure/lib/
+)
+
+func init() {
+	flag.BoolVar(&verbose, "verbose", false, "verbose output")
+}
+
+type command struct {
+	program string
+	args    []string
+}
+
+func newCmd(program string, args ...string) *command {
+	return &command{program, args}
+}
+
+func (c *command) String() string {
+	return fmt.Sprintf("%v %v", c.program, c.args)
+}
+
+// run runs the command and returns the output if it succeeds.
+// On error, the process dies.
+func (c *command) run() []byte {
+	cmd := exec.Command(c.program, c.args...)
+	b, err := cmd.Output()
+	if err != nil {
+		log.Fatalf("Could not run %v: %v", c, err)
+	}
+	return b
+}
+
+func resetAndCheckout() {
+	gitResetCmd.run()
+	args := gitCheckoutCmd.args
+	args = append(args, fileList...)
+	partialCheckoutCmd := newCmd(gitCheckoutCmd.program, args...)
+	if verbose {
+		log.Printf("%v", partialCheckoutCmd)
+	}
+	partialCheckoutCmd.run()
+}
+
+func update() {
+	err := os.Chdir(closureGitDir)
+	if err != nil {
+		log.Fatalf("Could not chdir to %v: %v", closureGitDir, err)
+	}
+	output := strings.TrimSpace(string(currentRevCmd.run()))
+	if string(output) != gitHash {
+		gitFetchCmd.run()
+	} else {
+		if verbose {
+			log.Printf("Already at rev %v, fetching not needed.", gitHash)
+		}
+	}
+	resetAndCheckout()
+}
+
+func clone() {
+	err := os.Chdir(closureGitDir)
+	if err != nil {
+		log.Fatalf("Could not chdir to %v: %v", closureGitDir, err)
+	}
+	gitCloneCmd.run()
+	resetAndCheckout()
+}
+
+func cpDir(src, dst string) error {
+	return filepath.Walk(src, func(path string, fi os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		suffix, err := filepath.Rel(closureGitDir, path)
+		if err != nil {
+			return fmt.Errorf("Failed to find Rel(%q, %q): %v", closureGitDir, path, err)
+		}
+		base := fi.Name()
+		if fi.IsDir() {
+			if base == ".git" {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+		return cpFile(path, filepath.Join(dst, suffix))
+	})
+}
+
+func cpFile(src, dst string) error {
+	sfi, err := os.Stat(src)
+	if err != nil {
+		return err
+	}
+	if !sfi.Mode().IsRegular() {
+		return fmt.Errorf("cpFile can't deal with non-regular file %s", src)
+	}
+
+	dstDir := filepath.Dir(dst)
+	if err := os.MkdirAll(dstDir, 0755); err != nil {
+		return err
+	}
+
+	df, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	sf, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer sf.Close()
+
+	n, err := io.Copy(df, sf)
+	if err == nil && n != sfi.Size() {
+		err = fmt.Errorf("copied wrong size for %s -> %s: copied %d; want %d", src, dst, n, sfi.Size())
+	}
+	cerr := df.Close()
+	if err == nil {
+		err = cerr
+	}
+	return err
+}
+
+func cpToDestDir() {
+	err := os.RemoveAll(destDir)
+	if err != nil {
+		log.Fatalf("could not remove %v: %v", destDir, err)
+	}
+	err = cpDir(closureGitDir, destDir)
+	if err != nil {
+		log.Fatalf("could not cp %v to %v : %v", closureGitDir, destDir, err)
+	}
+}
+
+// setup checks if the camlistore root can be found,
+// then sets up closureGitDir and destDir, and returns whether
+// we should clone or update in closureGitDir (depending on
+// if a .git dir was found).
+func setup() string {
+	camliRootPath, err := osutil.GoPackagePath("camlistore.org")
+	if err != nil {
+		log.Fatal("Package camlistore.org not found in $GOPATH (or $GOPATH not defined).")
+	}
+	destDir = filepath.Join(camliRootPath, "third_party", "closure", "lib")
+	closureGitDir = filepath.Join(camliRootPath, "tmp", "closure-lib")
+	op := "update"
+	_, err = os.Stat(closureGitDir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			err = os.MkdirAll(closureGitDir, 0755)
+			if err != nil {
+				log.Fatalf("Could not create %v: %v", closureGitDir, err)
+			}
+			op = "clone"
+		} else {
+			log.Fatalf("Could not stat %v: %v", closureGitDir, err)
+		}
+	}
+	dotGitPath := filepath.Join(closureGitDir, ".git")
+	_, err = os.Stat(dotGitPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			op = "clone"
+		} else {
+			log.Fatalf("Could not stat %v: %v", dotGitPath, err)
+		}
+	}
+	return op
+}
+
+func main() {
+	flag.Parse()
+
+	op := setup()
+	switch op {
+	case "clone":
+		if verbose {
+			fmt.Printf("cloning from %v at rev %v\n", gitRepo, gitHash)
+		}
+		clone()
+	case "update":
+		if verbose {
+			fmt.Printf("updating to rev %v\n", gitHash)
+		}
+		update()
+	default:
+		log.Fatalf("Unsupported operation: %v", op)
+	}
+
+	cpToDestDir()
+}