Prevent unnecessary updates of the changelog (FS#1758)

Ignore-this: 5653cc47ce2ee6412ba82c82eb2b45fe

darcs-hash:20090920171954-40dc4-0c4249b424314a930cdcbe710796db2820330aef.gz

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/exe/indexer.php b/lib/exe/indexer.php
index b114d4b3b..1f08fb56a 100644
--- a/lib/exe/indexer.php
+++ b/lib/exe/indexer.php
@@ -68,8 +68,9 @@ function runTrimRecentChanges($media_changes = false) {
     // changes or $conf['recent'] items, which ever is larger.
     // The trimming is only done once a day.
     if (@file_exists($fn) &&
-        (filectime($fn)+86400)<time() &&
+        (@filemtime($fn.'.trimmed')+86400)<time() &&
         !@file_exists($fn.'_tmp')) {
+            @touch($fn.'.trimmed');
             io_lock($fn);
             $lines = file($fn);
             if (count($lines)<=$conf['recent']) {
@@ -92,6 +93,13 @@ function runTrimRecentChanges($media_changes = false) {
               }
             }
 
+            if (count($lines)==count($out_lines)) {
+              // nothing to trim
+              @unlink($fn.'_tmp');
+              io_unlock($fn);
+              return false;
+            }
+
             // sort the final result, it shouldn't be necessary,
             //   however the extra robustness in making the changelog cache self-correcting is worth it
             ksort($out_lines);