The main goal is to allow configuration information to be temporarily
overridden by a separate config file.
---
 lib/config.cc          | 25 +++++++++++++++++++++++++
 lib/database-private.h |  3 +++
 lib/database.cc        |  4 ++++
 lib/notmuch-private.h  |  3 +++
 4 files changed, 35 insertions(+)

diff --git a/lib/config.cc b/lib/config.cc
index dae0ff0e..2d4c3801 100644
--- a/lib/config.cc
+++ b/lib/config.cc
@@ -194,3 +194,28 @@ notmuch_config_list_destroy (notmuch_config_list_t *list)
 {
     talloc_free (list);
 }
+
+notmuch_status_t
+_notmuch_config_load_from_database (notmuch_database_t *notmuch)
+{
+    notmuch_status_t status = NOTMUCH_STATUS_SUCCESS;
+    notmuch_config_list_t *list;
+
+    if (notmuch->config == NULL)
+       notmuch->config = _notmuch_string_map_create (notmuch);
+
+    if (unlikely(notmuch->config == NULL))
+       return NOTMUCH_STATUS_OUT_OF_MEMORY;
+
+    status = notmuch_database_get_config_list (notmuch, "", &list);
+    if (status)
+       return status;
+
+    for (; notmuch_config_list_valid (list); notmuch_config_list_move_to_next 
(list)) {
+       _notmuch_string_map_append (notmuch->config,
+                                   notmuch_config_list_key (list),
+                                   notmuch_config_list_value (list));
+    }
+
+    return status;
+}
diff --git a/lib/database-private.h b/lib/database-private.h
index 041602cd..bfeef869 100644
--- a/lib/database-private.h
+++ b/lib/database-private.h
@@ -226,6 +226,9 @@ struct _notmuch_database {
      * here, but at least they are small */
     notmuch_string_map_t *user_prefix;
     notmuch_string_map_t *user_header;
+
+    /* Cached and possibly overridden configuration */
+    notmuch_string_map_t *config;
 };
 
 /* Prior to database version 3, features were implied by the database
diff --git a/lib/database.cc b/lib/database.cc
index acc686c0..350abb11 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -987,6 +987,7 @@ notmuch_database_open_with_config (const char 
*database_path,
     notmuch = talloc_zero (NULL, notmuch_database_t);
     notmuch->exception_reported = false;
     notmuch->status_string = NULL;
+    notmuch->config = NULL;
     notmuch->path = talloc_strdup (notmuch, database_path);
 
     strip_trailing (notmuch->path, '/');
@@ -1085,6 +1086,9 @@ notmuch_database_open_with_config (const char 
*database_path,
            }
        }
        status = _setup_user_query_fields (notmuch);
+
+       if (status == NOTMUCH_STATUS_SUCCESS)
+           status = _notmuch_config_load_from_database (notmuch);
     } catch (const Xapian::Error &error) {
        IGNORE_RESULT (asprintf (&message, "A Xapian exception occurred opening 
database: %s\n",
                                 error.get_msg ().c_str ()));
diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index 57ec7f72..0f26b371 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -699,6 +699,9 @@ struct _notmuch_indexopts {
 
 #define EMPTY_STRING(s) ((s)[0] == '\0')
 
+/* config.cc */
+notmuch_status_t
+_notmuch_config_load_from_database (notmuch_database_t * db);
 NOTMUCH_END_DECLS
 
 #ifdef __cplusplus
-- 
2.28.0
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