This removes duplication between the struct element and the
configuration string_map entry.
---
 lib/config.cc          |  3 +++
 lib/database-private.h |  3 ---
 lib/database.cc        |  2 +-
 lib/open.cc            | 22 +++++++++++++++-------
 4 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/lib/config.cc b/lib/config.cc
index bfa6b4ae..44d546db 100644
--- a/lib/config.cc
+++ b/lib/config.cc
@@ -478,5 +478,8 @@ notmuch_config_set (notmuch_database_t *notmuch, notmuch_config_key_t key, const
 
 void
 _notmuch_config_cache (notmuch_database_t *notmuch, notmuch_config_key_t key, const char *val) {
+    if (notmuch->config == NULL)
+	notmuch->config = _notmuch_string_map_create (notmuch);
+
     _notmuch_string_map_set (notmuch->config, _notmuch_config_key_to_string (key), val);
 }
diff --git a/lib/database-private.h b/lib/database-private.h
index d936b216..2900382d 100644
--- a/lib/database-private.h
+++ b/lib/database-private.h
@@ -189,9 +189,6 @@ operator& (notmuch_field_flag_t a, notmuch_field_flag_t b)
 struct _notmuch_database {
     bool exception_reported;
 
-    /* Path to database parent directory and or/mail root */
-    char *path;
-
     /* Path to actual database */
     const char *xapian_path;
 
diff --git a/lib/database.cc b/lib/database.cc
index 1fc3ce9c..1d8839a5 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -748,7 +748,7 @@ notmuch_database_destroy (notmuch_database_t *notmuch)
 const char *
 notmuch_database_get_path (notmuch_database_t *notmuch)
 {
-    return notmuch->path;
+    return notmuch_config_get (notmuch, NOTMUCH_CONFIG_DATABASE_PATH);
 }
 
 unsigned int
diff --git a/lib/open.cc b/lib/open.cc
index efb0d6a3..a577ddca 100644
--- a/lib/open.cc
+++ b/lib/open.cc
@@ -305,6 +305,7 @@ _finish_open (notmuch_database_t *notmuch,
     char *incompat_features;
     char *message = NULL;
     unsigned int version;
+    const char *database_path = notmuch_database_get_path (notmuch);
 
     try {
 	std::string last_thread_id;
@@ -327,7 +328,7 @@ _finish_open (notmuch_database_t *notmuch,
 				     "Error: Notmuch database at %s\n"
 				     "       has a newer database format version (%u) than supported by this\n"
 				     "       version of notmuch (%u).\n",
-				     notmuch->path, version, NOTMUCH_DATABASE_VERSION));
+				     database_path, version, NOTMUCH_DATABASE_VERSION));
 	    notmuch_database_destroy (notmuch);
 	    notmuch = NULL;
 	    status = NOTMUCH_STATUS_FILE_ERROR;
@@ -345,7 +346,7 @@ _finish_open (notmuch_database_t *notmuch,
 				     "Error: Notmuch database at %s\n"
 				     "       requires features (%s)\n"
 				     "       not supported by this version of notmuch.\n",
-				     notmuch->path, incompat_features));
+				     database_path, incompat_features));
 	    notmuch_database_destroy (notmuch);
 	    notmuch = NULL;
 	    status = NOTMUCH_STATUS_FILE_ERROR;
@@ -429,6 +430,16 @@ _finish_open (notmuch_database_t *notmuch,
     return status;
 }
 
+static void
+_set_database_path (notmuch_database_t *notmuch,
+	   const char *database_path) {
+    char *path=talloc_strdup (notmuch, database_path);
+
+    strip_trailing (path, '/');
+
+    _notmuch_config_cache (notmuch, NOTMUCH_CONFIG_DATABASE_PATH, path);
+}
+
 notmuch_status_t
 notmuch_database_open_with_config (const char *database_path,
 				   notmuch_database_mode_t mode,
@@ -461,8 +472,7 @@ notmuch_database_open_with_config (const char *database_path,
     if (status)
 	goto DONE;
 
-    notmuch->path = talloc_strdup (notmuch, database_path);
-    strip_trailing (notmuch->path, '/');
+    _set_database_path (notmuch, database_path);
 
     status = _choose_xapian_path (local, database_path, &notmuch->xapian_path, &message);
     if (status)
@@ -547,8 +557,7 @@ notmuch_database_create_with_config (const char *database_path,
     if (status)
 	goto DONE;
 
-    notmuch->path = talloc_strdup (notmuch, database_path);
-    strip_trailing (notmuch->path, '/');
+    _set_database_path (notmuch, database_path);
 
     if (key_file && !split) {
 	const char *mail_root = g_key_file_get_value (key_file, "database", "mail_root", NULL);
@@ -565,7 +574,6 @@ notmuch_database_create_with_config (const char *database_path,
 	}
 
 	err = mkdir (notmuch_path, 0755);
-
 	if (err) {
 	    if (errno == EEXIST) {
 		status = NOTMUCH_STATUS_DATABASE_EXISTS;
-- 
2.30.0
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