lib: Implement versioning in the database and provide upgrade function.

[notmuch] / lib / directory.cc

diff --git a/lib/directory.cc b/lib/directory.cc
index 196f78059ecbace2e347aeb48222c787bf7e4060..461c0cc367801b72819f429013a214552efc279d 100644 (file)
--- a/lib/directory.cc
+++ b/lib/directory.cc
@@ -81,12 +81,18 @@ _notmuch_filenames_create (void *ctx,
 notmuch_bool_t
 notmuch_filenames_has_more (notmuch_filenames_t *filenames)
 {
+    if (filenames == NULL)
+       return NULL;
+
     return (filenames->iterator != filenames->end);
 }
 
 const char *
 notmuch_filenames_get (notmuch_filenames_t *filenames)
 {
+    if (filenames == NULL || filenames->iterator == filenames->end)
+       return NULL;
+
     if (filenames->filename == NULL) {
        std::string term = *filenames->iterator;
 
@@ -101,6 +107,9 @@ notmuch_filenames_get (notmuch_filenames_t *filenames)
 void
 notmuch_filenames_advance (notmuch_filenames_t *filenames)
 {
+    if (filenames == NULL)
+       return;
+
     if (filenames->filename) {
        talloc_free (filenames->filename);
        filenames->filename = NULL;
@@ -113,6 +122,9 @@ notmuch_filenames_advance (notmuch_filenames_t *filenames)
 void
 notmuch_filenames_destroy (notmuch_filenames_t *filenames)
 {
+    if (filenames == NULL)
+       return;
+
     talloc_free (filenames);
 }
 
@@ -170,11 +182,8 @@ _notmuch_directory_create (notmuch_database_t *notmuch,
 
     path = _notmuch_database_relative_path (notmuch, path);
 
-    if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY) {
-       fprintf (stderr, "Attempted to update a read-only database.\n");
-       *status_ret = NOTMUCH_STATUS_READONLY_DATABASE;
-       return NULL;
-    }
+    if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY)
+       INTERNAL_ERROR ("Failure to ensure database is writable");
 
     db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
 
@@ -256,11 +265,11 @@ notmuch_directory_set_mtime (notmuch_directory_t *directory,
 {
     notmuch_database_t *notmuch = directory->notmuch;
     Xapian::WritableDatabase *db;
+    notmuch_status_t status;
 
-    if (notmuch->mode == NOTMUCH_DATABASE_MODE_READ_ONLY) {
-       fprintf (stderr, "Attempted to update a read-only database.\n");
-       return NOTMUCH_STATUS_READONLY_DATABASE;
-    }
+    status = _notmuch_database_ensure_writable (notmuch);
+    if (status)
+       return status;
 
     db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);