If you've ever tried to debug your update hooks via drush you may (like me) have been puzzled as to why your breakpoints don't seem to work.
It seems that proc_open() is used to avoid memory issues http://drupal.org/node/687724 (effectively resetting all the Drupal static variables??) and this separate process isn't available to the debugger.
After stepping though the drush update process I found where this happens and have a bypass that is basically functional (drush reporting seems broken - but I can step through my code).
This patch is the change I've made.
I bypass the patch process and go direct to the update.
--- commands/core/drupal/update_6.inc (revision 547)
+++ commands/core/drupal/update_6.inc (working copy)
@@ -424,10 +424,7 @@
'error_message' => 'An unrecoverable error has occurred. You can find the error message below. It is advised to copy it to the clipboard for reference.',
'finished' => 'update_finished',
);
- batch_set($batch);
- $batch =& batch_get();
- $batch['progressive'] = FALSE;
- drush_backend_batch_process('updatedb-batch-process');
+ _update_do_one($module, $version, $batch);
}
else {
drush_log(dt("No database updates required"), 'success');
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