diff --git a/admin/cli/install.php b/admin/cli/install.php
index 4e934a275db..04d1ee891cb 100644
--- a/admin/cli/install.php
+++ b/admin/cli/install.php
@@ -133,9 +133,6 @@ $CFG->dirroot              = dirname(dirname(dirname(__FILE__)));
 $CFG->libdir               = "$CFG->dirroot/lib";
 $CFG->wwwroot              = "http://localhost";
 $CFG->httpswwwroot         = $CFG->wwwroot;
-$CFG->dataroot             = str_replace('\\', '/', dirname(dirname(dirname(dirname(__FILE__)))).'/moodledata');
-$CFG->tempdir              = $CFG->dataroot.'/temp';
-$CFG->cachedir             = $CFG->dataroot.'/temp';
 $CFG->docroot              = 'http://docs.moodle.org';
 $CFG->running_installer    = true;
 $CFG->early_install_lang   = true;
@@ -186,7 +183,7 @@ list($options, $unrecognized) = cli_get_params(
         'chmod'             => '2777',
         'lang'              => $CFG->lang,
         'wwwroot'           => '',
-        'dataroot'          => $CFG->dataroot,
+        'dataroot'          => str_replace('\\', '/', dirname(dirname(dirname(dirname(__FILE__)))).'/moodledata'),
         'dbtype'            => $defaultdb,
         'dbhost'            => 'localhost',
         'dbname'            => 'moodle',
@@ -330,9 +327,12 @@ $CFG->httpswwwroot  = $CFG->wwwroot;
 
 
 //We need dataroot before lang download
-if (!empty($options['dataroot'])) {
-    $CFG->dataroot = $options['dataroot'];
+$dataroot = clean_param($options['dataroot'], PARAM_PATH);
+if ($dataroot !== $options['dataroot']) {
+    $a = (object)array('option' => 'dataroot', 'value' => $options['dataroot']);
+    cli_error(get_string('cliincorrectvalueerror', 'admin', $a));
 }
+$CFG->dataroot = $dataroot;
 if ($interactive) {
     cli_separator();
     $i=0;
@@ -380,6 +380,8 @@ if ($interactive) {
         cli_error(get_string('pathserrcreatedataroot', 'install', $a));
     }
 }
+$CFG->tempdir  = $CFG->dataroot.'/temp';
+$CFG->cachedir = $CFG->dataroot.'/cache';
 
 // download required lang packs
 if ($CFG->lang !== 'en') {
diff --git a/install.php b/install.php
index 533c7aebd02..341a1472d27 100644
--- a/install.php
+++ b/install.php
@@ -166,7 +166,7 @@ $CFG->wwwroot              = install_guess_wwwroot(); // can not be changed - pp
 $CFG->httpswwwroot         = $CFG->wwwroot;
 $CFG->dataroot             = $config->dataroot;
 $CFG->tempdir              = $CFG->dataroot.'/temp';
-$CFG->cachedir             = $CFG->dataroot.'/temp';
+$CFG->cachedir             = $CFG->dataroot.'/cache';
 $CFG->admin                = $config->admin;
 $CFG->docroot              = 'http://docs.moodle.org';
 $CFG->langotherroot        = $CFG->dataroot.'/lang';
diff --git a/lib/installlib.php b/lib/installlib.php
index c6cb423c187..566bc8cb3c6 100644
--- a/lib/installlib.php
+++ b/lib/installlib.php
@@ -106,7 +106,27 @@ function install_init_dataroot($dataroot, $dirpermissions) {
         return false; // we can not continue
     }
 
-    // now create the lang folder - we need it and it makes sure we can really write in dataroot
+    // create the directory for $CFG->tempdir
+    if (!is_dir("$dataroot/temp")) {
+        if (!mkdir("$dataroot/temp", $dirpermissions, true)) {
+            return false;
+        }
+    }
+    if (!is_writable("$dataroot/temp")) {
+        return false; // we can not continue
+    }
+
+    // create the directory for $CFG->cachedir
+    if (!is_dir("$dataroot/cache")) {
+        if (!mkdir("$dataroot/cache", $dirpermissions, true)) {
+            return false;
+        }
+    }
+    if (!is_writable("$dataroot/cache")) {
+        return false; // we can not continue
+    }
+
+    // create the directory for $CFG->langotherroot
     if (!is_dir("$dataroot/lang")) {
         if (!mkdir("$dataroot/lang", $dirpermissions, true)) {
             return false;