lib: Remove message document directly after removing the last file name.

Previously, notmuch_database_remove_message would remove the message
file name, sync the change to the message document, re-find the
message document, and then delete it if there were no more file names.
An interruption after sync'ing would result in a file-name-less,
permanently un-removable zombie message that would produce errors and
odd results in searches.  We could wrap this in an atomic section, but
it's much simpler to eliminate the round-about approach and just
delete the message document instead of sync'ing it if we removed the
last filename.

diff --git a/lib/database.cc b/lib/database.cc
index 92c3c4e0a7f03088f9a8337233fc35056605e9fc..cf87d08d06c42cd0b41dfa1ba06d1c504b337ba7 100644 (file)
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1747,7 +1747,6 @@ notmuch_status_t
 notmuch_database_remove_message (notmuch_database_t *notmuch,
                                 const char *filename)
 {
-    Xapian::WritableDatabase *db;
     void *local;
     const char *prefix = _find_prefix ("file-direntry");
     char *direntry, *term;
@@ -1761,8 +1760,6 @@ notmuch_database_remove_message (notmuch_database_t *notmuch,
 
     local = talloc_new (notmuch);
 
-    db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
-
     try {
 
        status = _notmuch_database_filename_to_direntry (local, notmuch,
@@ -1785,23 +1782,11 @@ notmuch_database_remove_message (notmuch_database_t *notmuch,
                return COERCE_STATUS (private_status,
                                      "Inconsistent document ID in datbase.");
 
-           _notmuch_message_remove_filename (message, filename);
-           _notmuch_message_sync (message);
-
-           /* Take care to find document after sync'ing filename removal. */
-           document = find_document_for_doc_id (notmuch, *i);
-           j = document.termlist_begin ();
-           j.skip_to (prefix);
-
-           /* Was this the last file-direntry in the message? */
-           if (j == document.termlist_end () ||
-               strncmp ((*j).c_str (), prefix, strlen (prefix)))
-           {
-               db->delete_document (document.get_docid ());
-               status = NOTMUCH_STATUS_SUCCESS;
-           } else {
-               status = NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID;
-           }
+           status = _notmuch_message_remove_filename (message, filename);
+           if (status == NOTMUCH_STATUS_SUCCESS)
+               _notmuch_message_delete (message);
+           else if (status == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID)
+               _notmuch_message_sync (message);
        }
     } catch (const Xapian::Error &error) {
        fprintf (stderr, "Error: A Xapian exception occurred removing message: %s\n",

diff --git a/lib/message.cc b/lib/message.cc
index 20b77580227b8c94a1b12b1a9e3cac050a2236ce..531d304339a62e828a298f707e3517a9ead09519 100644 (file)
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -822,6 +822,22 @@ _notmuch_message_sync (notmuch_message_t *message)
     db->replace_document (message->doc_id, message->doc);
 }
 
+/* Delete a message document from the database. */
+notmuch_status_t
+_notmuch_message_delete (notmuch_message_t *message)
+{
+    notmuch_status_t status;
+    Xapian::WritableDatabase *db;
+
+    status = _notmuch_database_ensure_writable (message->notmuch);
+    if (status)
+       return status;
+
+    db = static_cast <Xapian::WritableDatabase *> (message->notmuch->xapian_db);
+    db->delete_document (message->doc_id);
+    return NOTMUCH_STATUS_SUCCESS;
+}
+
 /* Ensure that 'message' is not holding any file object open. Future
  * calls to various functions will still automatically open the
  * message file as needed.

diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 02e24ee8eb20d9c763c14d25454f86ad741a8133..d31953058a276da9fa31f13148ca9ae92fdafd29 100644 (file)
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -293,6 +293,9 @@ _notmuch_message_set_date (notmuch_message_t *message,
 void
 _notmuch_message_sync (notmuch_message_t *message);
 
+notmuch_status_t
+_notmuch_message_delete (notmuch_message_t *message);
+
 void
 _notmuch_message_close (notmuch_message_t *message);