Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.471
diff -u -p -r1.471 system.install
--- modules/system/system.install	3 Jun 2010 13:20:05 -0000	1.471
+++ modules/system/system.install	6 Jun 2010 17:51:36 -0000
@@ -364,8 +364,8 @@ function system_requirements($phase) {
   if ($phase == 'update') {
     $files = system_rebuild_module_data();
     foreach ($files as $module => $file) {
-      // Ignore disabled modules.
-      if (!$file->status) {
+      // Ignore disabled modules and install profiles.
+      if (!$file->status || substr($module, -8, 8) == '.profile') {
         continue;
       }
       // Check the module's PHP version.
Index: modules/system/system.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.test,v
retrieving revision 1.125
diff -u -p -r1.125 system.test
--- modules/system/system.test	26 May 2010 07:31:47 -0000	1.125
+++ modules/system/system.test	6 Jun 2010 17:51:36 -0000
@@ -1740,6 +1740,31 @@ class UpdateScriptFunctionalTest extends
   }
 
   /**
+   * Tests the detection of requirements for the update script to proceed.
+   */
+  function testUpdateRequirements() {
+    $this->drupalLogin($this->update_user);
+    $this->drupalGet($this->update_url, array('external' => TRUE));
+    $this->assertResponse(200);
+    // Test if disabling a module that another enabled module depends on will
+    // prevent the update from proceeding.
+    module_disable(array('block'), FALSE);
+    $this->assertFalse(module_exists('block'), t('Block module is disabled.'));
+    $this->assertTrue(module_exists('dashboard'), t('Dashboard module is enabled.'));
+    $this->drupalGet($this->update_url, array('external' => TRUE));
+    $this->assertText(t('Unresolved dependency'), t('The update process cannot proceed when a module dependency is not enabled.'));
+
+    // Test if modules required by the current install profile are not required
+    // to be enabled for an update to proceed.
+    module_enable(array('block'));
+    $this->assertTrue(module_exists('block'), t('Block module is enabled.'));
+    module_disable(array('overlay'));
+    $this->assertFalse(module_exists('overlay'), t('Overlay module is disabled.'));
+    $this->drupalGet($this->update_url, array('external' => TRUE));
+    $this->assertNoText(t('Unresolved dependency'), t('The update process can proceed when modules from the install profile are disabled.'));
+  }
+
+  /**
    * Tests the effect of using the update script on the theme system.
    */
   function testThemeSystem() {