diff --git a/server/go/camlistored/ui.go b/server/go/camlistored/ui.go
index f76ab28d2..2e9f4e778 100644
--- a/server/go/camlistored/ui.go
+++ b/server/go/camlistored/ui.go
@@ -213,8 +213,9 @@ func (ui *UIHandler) serveDiscovery(rw http.ResponseWriter, req *http.Request) {
 
 	pubRoots := map[string]interface{}{}
 	for key, pubh := range ui.PublishRoots {
-		pubRoots[key] = map[string]interface{}{
+		pubRoots[pubh.RootName] = map[string]interface{}{
 			"name": pubh.RootName,
+			"prefix": []string{key},
 			// TODO: include gpg key id
 		}
 	}
diff --git a/server/go/camlistored/ui/camli.js b/server/go/camlistored/ui/camli.js
index cbecb603d..28083b61d 100644
--- a/server/go/camlistored/ui/camli.js
+++ b/server/go/camlistored/ui/camli.js
@@ -81,6 +81,26 @@ function camliDescribeBlob(blobref, opts) {
     xhr.send();
 }
 
+function makeURL(base, map) {
+    for (var key in map) {
+        if (base.indexOf("?") == -1) {
+            base += "?";
+        } else {
+            base += "&";
+        }
+        base += key + "=" + encodeURIComponent(map[key]);
+    }
+    return base;
+}
+
+function camliPermanodeOfSignerAttrValue(signer, attr, value, opts) {
+    var xhr = camliJsonXhr("camliPermanodeOfSignerAttrValue", opts);
+    var path = makeURL(Camli.config.searchRoot + "camli/search/signerattrvalue",
+                       { signer: signer, attr: attr, value: value });
+    xhr.open("GET", path, true);
+    xhr.send();
+}
+
 function camliGetPermanodeClaims(permanode, opts) {
     var xhr = camliJsonXhr("camliGetPermanodeClaims", opts);
     var path = Camli.config.searchRoot + "camli/search/claims?permanode=" +
diff --git a/server/go/camlistored/ui/permanode.html b/server/go/camlistored/ui/permanode.html
index 513020f57..935baf235 100644
--- a/server/go/camlistored/ui/permanode.html
+++ b/server/go/camlistored/ui/permanode.html
@@ -35,14 +35,6 @@
       <input type="submit" id="btnAddTag" value="Add Tag(s)">
   </form>
 
-  <form id="formUrlPath">
-    <p>
-      <label for="inputUrlPath">URL:</label>
-      http://<span id="urlHostName">(loading)</span>/<input id="inputUrlPath" size="50" disabled="disabled">
-      <input type="submit" id="btnSetUrlPath" value="Save path" disabled="disabled">
-    </p>
-  </form>
-
   <form id="formAccess">
   <p>Access:
     <select id="selectAccess" disabled="disabled">
@@ -52,7 +44,7 @@
     <input type="submit" id="btnSaveAccess" value="Save" disabled="disabled">
 
     ... with URL: <select id="selectPublishRoot">
-      <option value="">(unpublished)</option>
+      <option value=""></option>
       </select>
       <input type="text" id="publishSuffix" size="40">
       <input type="submit" id="btnSavePublish" value="Set URL">
diff --git a/server/go/camlistored/ui/permanode.js b/server/go/camlistored/ui/permanode.js
index 1605f2fb6..3a6fa4fb6 100644
--- a/server/go/camlistored/ui/permanode.js
+++ b/server/go/camlistored/ui/permanode.js
@@ -412,44 +412,85 @@ function onBlobDescribed(jres) {
     btnSaveAccess.disabled = false;
 }
 
-function handleFormUrlPathSubmit(e) {
-    e.stopPropagation();
-    e.preventDefault();
-
-    var inputUrlPath = document.getElementById("inputUrlPath");
-    if (!inputUrlPath.value) {
-	alert("Please specify a mount path like '/foo/bar/stuff'");
-	return;
+function setupRootsDropdown() {
+    var selRoots = document.getElementById("selectPublishRoot");
+    if (!Camli.config.publishRoots) {
+        console.log("no publish roots");
+        return;
     }
-
-    // var btnSaveUrlPath = document.getElementById("btnSaveUrlPath");
-    // btnSaveUrlPath.disabled = true;
-    // btnSaveUrlPath.disabled = true;
-
-    // TODO(bslatkin): Finish this function. Need to call
-    // camliNewSetAttributeClaim() here with the root node for the
-    // server specified as the target of the claim. See
-    // lib/go/camli/search/search.go:FindPermanode for the general
-    // approach for finding the root permanode by name.
-
-    // camliNewSetAttributeClaim(
-    //   getPermanodeParam(),
-    //   "mount:" + inputUrlPath.value,
-    //   ,
-    //   {
-    // 	  success: oneDone,
-    // 	  fail: function(msg) {
-    // 	      alert(msg);
-    // 	      oneDone();
-    // 	  }
-    //   });
+    for (var rootName in Camli.config.publishRoots) {
+        var opt = document.createElement("option");
+        opt.setAttribute("value", rootName);
+        opt.appendChild(document.createTextNode(Camli.config.publishRoots[rootName].prefix[0]));
+        selRoots.appendChild(opt);
+    }
+    document.getElementById("btnSavePublish").addEventListener("click", onBtnSavePublish);
 }
 
-function setupUrlPathHandler() {
-    var hostName = document.getElementById("urlHostName");
-    hostName.innerHTML = window.location.host;
-    var formUrlPath = document.getElementById("formUrlPath");
-    formUrlPath.addEventListener("submit", handleFormUrlPathSubmit);
+function onBtnSavePublish(e) {
+    var selRoots = document.getElementById("selectPublishRoot");
+    var suffix = document.getElementById("publishSuffix");
+
+    var ourPermanode = getPermanodeParam();
+    if (!ourPermanode) {
+        return;
+    }
+
+    var publishRoot = selRoots.value;
+    if (!publishRoot) {
+        alert("no publish root selected");
+        return;
+    } 
+    var pathSuffix = suffix.value;
+    if (!pathSuffix) {
+        alert("no path suffix specified");
+        return;
+    }
+
+    selRoots.disabled = true;
+    suffix.disabled = true;
+
+    var enabled = function() {
+        selRoots.disabled = false;
+        suffix.disabled = false;
+    };
+
+    // Step 1: resolve selRoots.value -> blobref of the root's permanode.
+    // Step 2: set attribute on the root's permanode, or a sub-permanode
+    // if multiple path components in suffix:
+    //         "camliPath:<suffix>" => permanode-of-ourselves
+
+    var sigcb = {};
+    sigcb.success = function(sigconf) {
+        var savcb = {};
+        savcb.success = function(pnres) {
+            if (!pnres.permanode) {
+                alert("failed to publish root's permanode");
+                enabled();
+                return;
+            }
+            var attrcb = {};
+            attrcb.success = function() {
+                console.log("success.");
+                enabled();
+            };
+            attrcb.fail = function() {
+                alert("failed to set attribute");
+                enabled();
+            };
+            camliNewSetAttributeClaim(pnres.permanode, "camliPath:" + pathSuffix, ourPermanode, attrcb);
+        };
+        savcb.fail = function() {
+            alert("failed to find publish root's permanode");
+            enabled();
+        };
+        camliPermanodeOfSignerAttrValue(sigconf.publicKeyBlobRef, "camliRoot", publishRoot, savcb);
+    };
+    sigcb.fail = function() {
+        alert("sig disco failed");
+        enabled();
+    }
+    camliSigDiscovery(sigcb);
 }
 
 function permanodePageOnLoad(e) {
@@ -469,11 +510,11 @@ function permanodePageOnLoad(e) {
     var selectType = document.getElementById("type");
     selectType.addEventListener("change", onTypeChange);
 
+    setupRootsDropdown();
+
     setupFilesHandlers();
 
     buildPermanodeUi();
-
-    setupUrlPathHandler();
 }
 
 window.addEventListener("load", permanodePageOnLoad);