--- modules/update/update.compare.inc	2008-01-17 07:03:21.000000000 -0500
+++ modules/update/update.compare.new.inc	2008-01-21 13:55:21.000000000 -0500
@@ -233,315 +233,348 @@ function update_process_project_info(&$p
  * @see update_process_project_info()
  */
 function update_calculate_project_data($available) {
-  $projects = update_get_projects();
-  update_process_project_info($projects);
-  foreach ($projects as $project => $project_info) {
-    if (isset($available[$project])) {
-
-      // If the project status is marked as something bad, there's nothing
-      // else to consider.
-      if (isset($available[$project]['project_status'])) {
-        switch ($available[$project]['project_status']) {
-          case 'insecure':
-            $projects[$project]['status'] = UPDATE_NOT_SECURE;
-            if (empty($projects[$project]['extra'])) {
-              $projects[$project]['extra'] = array();
-            }
-            $projects[$project]['extra'][] = array(
-              'class' => 'project-not-secure',
-              'label' => t('Project not secure'),
-              'data' => t('This project has been labeled insecure by the Drupal security team, and is no longer available for download. Immediately disabling everything included by this project is strongly recommended!'),
-            );
-            break;
-          case 'unpublished':
-          case 'revoked':
-            $projects[$project]['status'] = UPDATE_REVOKED;
-            if (empty($projects[$project]['extra'])) {
-              $projects[$project]['extra'] = array();
-            }
-            $projects[$project]['extra'][] = array(
-              'class' => 'project-revoked',
-              'label' => t('Project revoked'),
-              'data' => t('This project has been revoked, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
-            );
-            break;
-          case 'unsupported':
-            $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
-            if (empty($projects[$project]['extra'])) {
-              $projects[$project]['extra'] = array();
-            }
-            $projects[$project]['extra'][] = array(
-              'class' => 'project-not-supported',
-              'label' => t('Project not supported'),
-              'data' => t('This project is no longer supported, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
-            );
-            break;
-          default:
-            // Assume anything else (e.g. 'published') is valid and we should
-            // perform the rest of the logic in this function.
-            break;
-        }
-      }
-
-      if (!empty($projects[$project]['status'])) {
-        // We already know the status for this project, so there's nothing
-        // else to compute. Just record everything else we fetched from the
-        // XML file into our projects array and move to the next project.
-        $projects[$project] += $available[$project];
-        continue;
-      }
-
-      // Figure out the target major version.
-      $existing_major = $project_info['existing_major'];
-      $supported_majors = array();
-      if (isset($available[$project]['supported_majors'])) {
-        $supported_majors = explode(',', $available[$project]['supported_majors']);
-      }
-      elseif (isset($available[$project]['default_major'])) {
-        // Older release history XML file without supported or recommended.
-        $supported_majors[] = $available[$project]['default_major'];
-      }
-
-      if (in_array($existing_major, $supported_majors)) {
-        // Still supported, stay at the current major version.
-        $target_major = $existing_major;
-      }
-      elseif (isset($available[$project]['recommended_major'])) {
-        // Since 'recommended_major' is defined, we know this is the new XML
-        // format. Therefore, we know the current release is unsupported since
-        // its major version was not in the 'supported_majors' list. We should
-        // find the best release from the recommended major version.
-        $target_major = $available[$project]['recommended_major'];
-        $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
-      }
-      elseif (isset($available[$project]['default_major'])) {
-        // Older release history XML file without recommended, so recommend
-        // the currently defined "default_major" version.
-        $target_major = $available[$project]['default_major'];
-      }
-      else {
-        // Malformed XML file? Stick with the current version.
-        $target_major = $existing_major;
-      }
-
-      // Make sure we never tell the admin to downgrade. If we recommended an
-      // earlier version than the one they're running, they'd face an
-      // impossible data migration problem, since Drupal never supports a DB
-      // downgrade path. In the unfortunate case that what they're running is
-      // unsupported, and there's nothing newer for them to upgrade to, we
-      // can't print out a "Recommended version", but just have to tell them
-      // what they have is unsupported and let them figure it out.
-      $target_major = max($existing_major, $target_major);
-
-      $version_patch_changed = '';
-      $patch = '';
-
-      // Defend ourselves from XML history files that contain no releases.
-      if (empty($available[$project]['releases'])) {
-        $projects[$project]['status'] = UPDATE_UNKNOWN;
-        $projects[$project]['reason'] = t('No available releases found');
-        continue;
-      }
-      foreach ($available[$project]['releases'] as $version => $release) {
-        // First, if this is the existing release, check a few conditions.
-        if ($projects[$project]['existing_version'] == $version) {
-          if (isset($release['terms']['Release type']) &&
-              in_array('Insecure', $release['terms']['Release type'])) {
-            $projects[$project]['status'] = UPDATE_NOT_SECURE;
-          }
-          elseif ($release['status'] == 'unpublished') {
-            $projects[$project]['status'] = UPDATE_REVOKED;
-            if (empty($projects[$project]['extra'])) {
-              $projects[$project]['extra'] = array();
-            }
-            $projects[$project]['extra'][] = array(
-              'class' => 'release-revoked',
-              'label' => t('Release revoked'),
-              'data' => t('Your currently installed release has been revoked, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
-            );
-          }
-          elseif (isset($release['terms']['Release type']) &&
-                  in_array('Unsupported', $release['terms']['Release type'])) {
-            $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
-            if (empty($projects[$project]['extra'])) {
-              $projects[$project]['extra'] = array();
-            }
-            $projects[$project]['extra'][] = array(
-              'class' => 'release-not-supported',
-              'label' => t('Release not supported'),
-              'data' => t('Your currently installed release is now unsupported, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
-            );
-          }
-        }
-
-        // Otherwise, ignore unpublished, insecure, or unsupported releases.
-        if ($release['status'] == 'unpublished' ||
-            (isset($release['terms']['Release type']) &&
-             (in_array('Insecure', $release['terms']['Release type']) ||
-              in_array('Unsupported', $release['terms']['Release type'])))) {
+  // Retrieve the projects from cache, if present.
+  $projects = update_project_cache();
+  // If $projects is empty, then the cache must be rebuilt.
+  if (empty($projects)) {
+    $projects = update_get_projects();
+    update_process_project_info($projects);
+    foreach ($projects as $project => $project_info) {
+      if (isset($available[$project])) {
+  
+        // If the project status is marked as something bad, there's nothing
+        // else to consider.
+        if (isset($available[$project]['project_status'])) {
+          switch ($available[$project]['project_status']) {
+            case 'insecure':
+              $projects[$project]['status'] = UPDATE_NOT_SECURE;
+              if (empty($projects[$project]['extra'])) {
+                $projects[$project]['extra'] = array();
+              }
+              $projects[$project]['extra'][] = array(
+                'class' => 'project-not-secure',
+                'label' => t('Project not secure'),
+                'data' => t('This project has been labeled insecure by the Drupal security team, and is no longer available for download. Immediately disabling everything included by this project is strongly recommended!'),
+              );
+              break;
+            case 'unpublished':
+            case 'revoked':
+              $projects[$project]['status'] = UPDATE_REVOKED;
+              if (empty($projects[$project]['extra'])) {
+                $projects[$project]['extra'] = array();
+              }
+              $projects[$project]['extra'][] = array(
+                'class' => 'project-revoked',
+                'label' => t('Project revoked'),
+                'data' => t('This project has been revoked, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
+              );
+              break;
+            case 'unsupported':
+              $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
+              if (empty($projects[$project]['extra'])) {
+                $projects[$project]['extra'] = array();
+              }
+              $projects[$project]['extra'][] = array(
+                'class' => 'project-not-supported',
+                'label' => t('Project not supported'),
+                'data' => t('This project is no longer supported, and is no longer available for download. Disabling everything included by this project is strongly recommended!'),
+              );
+              break;
+            default:
+              // Assume anything else (e.g. 'published') is valid and we should
+              // perform the rest of the logic in this function.
+              break;
+          }
+        }
+  
+        if (!empty($projects[$project]['status'])) {
+          // We already know the status for this project, so there's nothing
+          // else to compute. Just record everything else we fetched from the
+          // XML file into our projects array and move to the next project.
+          $projects[$project] += $available[$project];
           continue;
         }
-
-        // See if this is a higher major version than our target and yet still
-        // supported. If so, record it as an "Also available" release.
-        if ($release['version_major'] > $target_major &&
-            in_array($release['version_major'], $supported_majors)) {
-          if (!isset($available[$project]['also'])) {
-            $available[$project]['also'] = array();
-          }
-          if (!isset($available[$project]['also'][$release['version_major']])) {
-            $available[$project]['also'][$release['version_major']] = $version;
-          }
-          // Otherwise, this release can't matter to us, since it's neither
-          // from the release series we're currently using nor the recommended
-          // release. We don't even care about security updates for this
-          // branch, since if a project maintainer puts out a security release
-          // at a higher major version and not at the lower major version,
-          // they must remove the lower version from the supported major
-          // versions at the same time, in which case we won't hit this code.
-          continue;
+  
+        // Figure out the target major version.
+        $existing_major = $project_info['existing_major'];
+        $supported_majors = array();
+        if (isset($available[$project]['supported_majors'])) {
+          $supported_majors = explode(',', $available[$project]['supported_majors']);
+        }
+        elseif (isset($available[$project]['default_major'])) {
+          // Older release history XML file without supported or recommended.
+          $supported_majors[] = $available[$project]['default_major'];
+        }
+  
+        if (in_array($existing_major, $supported_majors)) {
+          // Still supported, stay at the current major version.
+          $target_major = $existing_major;
+        }
+        elseif (isset($available[$project]['recommended_major'])) {
+          // Since 'recommended_major' is defined, we know this is the new XML
+          // format. Therefore, we know the current release is unsupported since
+          // its major version was not in the 'supported_majors' list. We should
+          // find the best release from the recommended major version.
+          $target_major = $available[$project]['recommended_major'];
+          $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
+        }
+        elseif (isset($available[$project]['default_major'])) {
+          // Older release history XML file without recommended, so recommend
+          // the currently defined "default_major" version.
+          $target_major = $available[$project]['default_major'];
         }
-
-        // Look for the 'latest version' if we haven't found it yet. Latest is
-        // defined as the most recent version for the target major version.
-        if (!isset($available[$project]['latest_version'])
-            && $release['version_major'] == $target_major) {
-          $available[$project]['latest_version'] = $version;
+        else {
+          // Malformed XML file? Stick with the current version.
+          $target_major = $existing_major;
         }
-
-        // Look for the development snapshot release for this branch.
-        if (!isset($available[$project]['dev_version'])
-            && $release['version_major'] == $target_major
-            && isset($release['version_extra'])
-            && $release['version_extra'] == 'dev') {
-          $available[$project]['dev_version'] = $version;
+  
+        // Make sure we never tell the admin to downgrade. If we recommended an
+        // earlier version than the one they're running, they'd face an
+        // impossible data migration problem, since Drupal never supports a DB
+        // downgrade path. In the unfortunate case that what they're running is
+        // unsupported, and there's nothing newer for them to upgrade to, we
+        // can't print out a "Recommended version", but just have to tell them
+        // what they have is unsupported and let them figure it out.
+        $target_major = max($existing_major, $target_major);
+  
+        $version_patch_changed = '';
+        $patch = '';
+  
+        // Defend ourselves from XML history files that contain no releases.
+        if (empty($available[$project]['releases'])) {
+          $projects[$project]['status'] = UPDATE_UNKNOWN;
+          $projects[$project]['reason'] = t('No available releases found');
+          continue;
         }
-
-        // Look for the 'recommended' version if we haven't found it yet (see
-        // phpdoc at the top of this function for the definition).
-        if (!isset($available[$project]['recommended'])
-            && $release['version_major'] == $target_major
-            && isset($release['version_patch'])) {
-          if ($patch != $release['version_patch']) {
-            $patch = $release['version_patch'];
-            $version_patch_changed = $release['version'];
-          }
-          if (empty($release['version_extra']) && $patch == $release['version_patch']) {
-            $available[$project]['recommended'] = $version_patch_changed;
+        foreach ($available[$project]['releases'] as $version => $release) {
+          // First, if this is the existing release, check a few conditions.
+          if ($projects[$project]['existing_version'] == $version) {
+            if (isset($release['terms']['Release type']) &&
+                in_array('Insecure', $release['terms']['Release type'])) {
+              $projects[$project]['status'] = UPDATE_NOT_SECURE;
+            }
+            elseif ($release['status'] == 'unpublished') {
+              $projects[$project]['status'] = UPDATE_REVOKED;
+              if (empty($projects[$project]['extra'])) {
+                $projects[$project]['extra'] = array();
+              }
+              $projects[$project]['extra'][] = array(
+                'class' => 'release-revoked',
+                'label' => t('Release revoked'),
+                'data' => t('Your currently installed release has been revoked, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
+              );
+            }
+            elseif (isset($release['terms']['Release type']) &&
+                    in_array('Unsupported', $release['terms']['Release type'])) {
+              $projects[$project]['status'] = UPDATE_NOT_SUPPORTED;
+              if (empty($projects[$project]['extra'])) {
+                $projects[$project]['extra'] = array();
+              }
+              $projects[$project]['extra'][] = array(
+                'class' => 'release-not-supported',
+                'label' => t('Release not supported'),
+                'data' => t('Your currently installed release is now unsupported, and is no longer available for download. Disabling everything included in this release or upgrading is strongly recommended!'),
+              );
+            }
           }
-        }
-
-        // Stop searching once we hit the currently installed version.
-        if ($projects[$project]['existing_version'] == $version) {
-          break;
-        }
-
-        // If we're running a dev snapshot and have a timestamp, stop
-        // searching for security updates once we hit an official release
-        // older than what we've got.  Allow 100 seconds of leeway to handle
-        // differences between the datestamp in the .info file and the
-        // timestamp of the tarball itself (which are usually off by 1 or 2
-        // seconds) so that we don't flag that as a new release.
-        if ($projects[$project]['install_type'] == 'dev') {
-          if (empty($projects[$project]['datestamp'])) {
-            // We don't have current timestamp info, so we can't know.
+  
+          // Otherwise, ignore unpublished, insecure, or unsupported releases.
+          if ($release['status'] == 'unpublished' ||
+              (isset($release['terms']['Release type']) &&
+               (in_array('Insecure', $release['terms']['Release type']) ||
+                in_array('Unsupported', $release['terms']['Release type'])))) {
             continue;
           }
-          elseif (isset($release['date']) && ($projects[$project]['datestamp'] + 100 > $release['date'])) {
-            // We're newer than this, so we can skip it.
+  
+          // See if this is a higher major version than our target and yet still
+          // supported. If so, record it as an "Also available" release.
+          if ($release['version_major'] > $target_major &&
+              in_array($release['version_major'], $supported_majors)) {
+            if (!isset($available[$project]['also'])) {
+              $available[$project]['also'] = array();
+            }
+            if (!isset($available[$project]['also'][$release['version_major']])) {
+              $available[$project]['also'][$release['version_major']] = $version;
+            }
+            // Otherwise, this release can't matter to us, since it's neither
+            // from the release series we're currently using nor the recommended
+            // release. We don't even care about security updates for this
+            // branch, since if a project maintainer puts out a security release
+            // at a higher major version and not at the lower major version,
+            // they must remove the lower version from the supported major
+            // versions at the same time, in which case we won't hit this code.
             continue;
           }
+  
+          // Look for the 'latest version' if we haven't found it yet. Latest is
+          // defined as the most recent version for the target major version.
+          if (!isset($available[$project]['latest_version'])
+              && $release['version_major'] == $target_major) {
+            $available[$project]['latest_version'] = $version;
+          }
+  
+          // Look for the development snapshot release for this branch.
+          if (!isset($available[$project]['dev_version'])
+              && $release['version_major'] == $target_major
+              && isset($release['version_extra'])
+              && $release['version_extra'] == 'dev') {
+            $available[$project]['dev_version'] = $version;
+          }
+  
+          // Look for the 'recommended' version if we haven't found it yet (see
+          // phpdoc at the top of this function for the definition).
+          if (!isset($available[$project]['recommended'])
+              && $release['version_major'] == $target_major
+              && isset($release['version_patch'])) {
+            if ($patch != $release['version_patch']) {
+              $patch = $release['version_patch'];
+              $version_patch_changed = $release['version'];
+            }
+            if (empty($release['version_extra']) && $patch == $release['version_patch']) {
+              $available[$project]['recommended'] = $version_patch_changed;
+            }
+          }
+  
+          // Stop searching once we hit the currently installed version.
+          if ($projects[$project]['existing_version'] == $version) {
+            break;
+          }
+  
+          // If we're running a dev snapshot and have a timestamp, stop
+          // searching for security updates once we hit an official release
+          // older than what we've got.  Allow 100 seconds of leeway to handle
+          // differences between the datestamp in the .info file and the
+          // timestamp of the tarball itself (which are usually off by 1 or 2
+          // seconds) so that we don't flag that as a new release.
+          if ($projects[$project]['install_type'] == 'dev') {
+            if (empty($projects[$project]['datestamp'])) {
+              // We don't have current timestamp info, so we can't know.
+              continue;
+            }
+            elseif (isset($release['date']) && ($projects[$project]['datestamp'] + 100 > $release['date'])) {
+              // We're newer than this, so we can skip it.
+              continue;
+            }
+          }
+  
+          // See if this release is a security update.
+          if (isset($release['terms']['Release type'])
+              && in_array('Security update', $release['terms']['Release type'])) {
+            $projects[$project]['security updates'][] = $release;
+          }
         }
-
-        // See if this release is a security update.
-        if (isset($release['terms']['Release type'])
-            && in_array('Security update', $release['terms']['Release type'])) {
-          $projects[$project]['security updates'][] = $release;
+  
+        // If we were unable to find a recommended version, then make the latest
+        // version the recommended version if possible.
+        if (!isset($available[$project]['recommended']) && isset($available[$project]['latest_version'])) {
+          $available[$project]['recommended'] = $available[$project]['latest_version'];
         }
-      }
-
-      // If we were unable to find a recommended version, then make the latest
-      // version the recommended version if possible.
-      if (!isset($available[$project]['recommended']) && isset($available[$project]['latest_version'])) {
-        $available[$project]['recommended'] = $available[$project]['latest_version'];
-      }
-
-      // Stash the info about available releases into our $projects array.
-      $projects[$project] += $available[$project];
-
-      //
-      // Check to see if we need an update or not.
-      //
-
-      if (!empty($projects[$project]['security updates'])) {
-        // If we found security updates, that always trumps any other status.
-        $projects[$project]['status'] = UPDATE_NOT_SECURE;
-      }
-
-      if (isset($projects[$project]['status'])) {
-        // If we already know the status, we're done.
-        continue;
-      }
-
-      // If we don't know what to recommend, there's nothing we can report.
-      // Bail out early.
-      if (!isset($projects[$project]['recommended'])) {
-        $projects[$project]['status'] = UPDATE_UNKNOWN;
-        $projects[$project]['reason'] = t('No available releases found');
-        continue;
-      }
-
-      // If we're running a dev snapshot, compare the date of the dev snapshot
-      // with the latest official version, and record the absolute latest in
-      // 'latest_dev' so we can correctly decide if there's a newer release
-      // than our current snapshot.
-      if ($projects[$project]['install_type'] == 'dev') {
-        if (isset($available[$project]['dev_version']) && $available[$project]['releases'][$available[$project]['dev_version']]['date'] > $available[$project]['releases'][$available[$project]['latest_version']]['date']) {
-          $projects[$project]['latest_dev'] = $available[$project]['dev_version'];
+  
+        // Stash the info about available releases into our $projects array.
+        $projects[$project] += $available[$project];
+  
+        //
+        // Check to see if we need an update or not.
+        //
+  
+        if (!empty($projects[$project]['security updates'])) {
+          // If we found security updates, that always trumps any other status.
+          $projects[$project]['status'] = UPDATE_NOT_SECURE;
+        }
+  
+        if (isset($projects[$project]['status'])) {
+          // If we already know the status, we're done.
+          continue;
         }
-        else {
-          $projects[$project]['latest_dev'] = $available[$project]['latest_version'];
+  
+        // If we don't know what to recommend, there's nothing we can report.
+        // Bail out early.
+        if (!isset($projects[$project]['recommended'])) {
+          $projects[$project]['status'] = UPDATE_UNKNOWN;
+          $projects[$project]['reason'] = t('No available releases found');
+          continue;
         }
-      }
-
-      // Figure out the status, based on what we've seen and the install type.
-      switch ($projects[$project]['install_type']) {
-        case 'official':
-          if ($projects[$project]['existing_version'] == $projects[$project]['recommended'] || $projects[$project]['existing_version'] == $projects[$project]['latest_version']) {
-            $projects[$project]['status'] = UPDATE_CURRENT;
-          }
-          else {
-            $projects[$project]['status'] = UPDATE_NOT_CURRENT;
-          }
-          break;
-
-        case 'dev':
-          $latest = $available[$project]['releases'][$projects[$project]['latest_dev']];
-          if (empty($projects[$project]['datestamp'])) {
-            $projects[$project]['status'] = UPDATE_NOT_CHECKED;
-            $projects[$project]['reason'] = t('Unknown release date');
-          }
-          elseif (($projects[$project]['datestamp'] + 100 > $latest['date'])) {
-            $projects[$project]['status'] = UPDATE_CURRENT;
+  
+        // If we're running a dev snapshot, compare the date of the dev snapshot
+        // with the latest official version, and record the absolute latest in
+        // 'latest_dev' so we can correctly decide if there's a newer release
+        // than our current snapshot.
+        if ($projects[$project]['install_type'] == 'dev') {
+          if (isset($available[$project]['dev_version']) && $available[$project]['releases'][$available[$project]['dev_version']]['date'] > $available[$project]['releases'][$available[$project]['latest_version']]['date']) {
+            $projects[$project]['latest_dev'] = $available[$project]['dev_version'];
           }
           else {
-            $projects[$project]['status'] = UPDATE_NOT_CURRENT;
+            $projects[$project]['latest_dev'] = $available[$project]['latest_version'];
           }
-          break;
-
-        default:
-          $projects[$project]['status'] = UPDATE_UNKNOWN;
-          $projects[$project]['reason'] = t('Invalid info');
+        }
+  
+        // Figure out the status, based on what we've seen and the install type.
+        switch ($projects[$project]['install_type']) {
+          case 'official':
+            if ($projects[$project]['existing_version'] == $projects[$project]['recommended'] || $projects[$project]['existing_version'] == $projects[$project]['latest_version']) {
+              $projects[$project]['status'] = UPDATE_CURRENT;
+            }
+            else {
+              $projects[$project]['status'] = UPDATE_NOT_CURRENT;
+            }
+            break;
+  
+          case 'dev':
+            $latest = $available[$project]['releases'][$projects[$project]['latest_dev']];
+            if (empty($projects[$project]['datestamp'])) {
+              $projects[$project]['status'] = UPDATE_NOT_CHECKED;
+              $projects[$project]['reason'] = t('Unknown release date');
+            }
+            elseif (($projects[$project]['datestamp'] + 100 > $latest['date'])) {
+              $projects[$project]['status'] = UPDATE_CURRENT;
+            }
+            else {
+              $projects[$project]['status'] = UPDATE_NOT_CURRENT;
+            }
+            break;
+  
+          default:
+            $projects[$project]['status'] = UPDATE_UNKNOWN;
+            $projects[$project]['reason'] = t('Invalid info');
+        }
+      }
+      else {
+        $projects[$project]['status'] = UPDATE_UNKNOWN;
+        $projects[$project]['reason'] = t('No available releases found');
       }
     }
-    else {
-      $projects[$project]['status'] = UPDATE_UNKNOWN;
-      $projects[$project]['reason'] = t('No available releases found');
-    }
+    // Give other modules a chance to alter the status (for example, to allow a
+    // contrib module to provide fine-grained settings to ignore specific
+    // projects or releases).
+    drupal_alter('update_status', $projects);
+    // Set the projects array into the cache table.
+    cache_set('update_projects', $projects, 'cache_update', time() + 3600);
+  }
+  return $projects;
+}
+
+/**
+ * Store the project data in the cache table and empty
+ * the cache when necessary.
+ * @return
+ * The $projects array generated by update_calculate_project_data() 
+ * and stored in the {cache_update} table. Returns an empty array
+ * when the cache is cleared.
+ */
+function update_project_cache() {
+  $projects = array();
+  // In some cases, we must clear the cache.  Rather than do so on a time
+  // basis, we check for specific paths.
+  $q= $_GET['q'];
+  $paths = array('admin/build/modules', 'admin/build/themes', 'admin/reports', 'admin/reports/updates', 'admin/reports/status');
+  if (in_array($q, $paths)) {
+    cache_clear_all('update_projects', 'cache_update');
   }
-  // Give other modules a chance to alter the status (for example, to allow a
-  // contrib module to provide fine-grained settings to ignore specific
-  // projects or releases).
-  drupal_alter('update_status', $projects);
+  else {
+    $cache = cache_get('update_projects', 'cache_update');
+    if (!empty($cache->data)) {
+      $projects = $cache->data;
+    }  
+  }  
   return $projects;
 }