Permit opening the notmuch database in read-only mode.

[notmuch] / lib / database.cc

diff --git a/lib/database.cc b/lib/database.cc
index 207246cc5dc0387a04083c460b869515614fd970..fb38664789e50c360df7c5a2c400e6015be81904 100644 (file)
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -172,6 +172,8 @@ notmuch_status_to_string (notmuch_status_t status)
        return "No error occurred";
     case NOTMUCH_STATUS_OUT_OF_MEMORY:
        return "Out of memory";
+    case NOTMUCH_STATUS_READONLY_DATABASE:
+       return "The database is read-only";
     case NOTMUCH_STATUS_XAPIAN_EXCEPTION:
        return "A Xapian exception occurred";
     case NOTMUCH_STATUS_FILE_ERROR:
@@ -438,7 +440,8 @@ notmuch_database_create (const char *path)
        goto DONE;
     }
 
-    notmuch = notmuch_database_open (path);
+    notmuch = notmuch_database_open (path,
+                                    NOTMUCH_DATABASE_MODE_WRITABLE);
 
   DONE:
     if (notmuch_path)
@@ -448,7 +451,8 @@ notmuch_database_create (const char *path)
 }
 
 notmuch_database_t *
-notmuch_database_open (const char *path)
+notmuch_database_open (const char *path,
+                      notmuch_database_mode_t mode)
 {
     notmuch_database_t *notmuch = NULL;
     char *notmuch_path = NULL, *xapian_path = NULL;
@@ -481,9 +485,14 @@ notmuch_database_open (const char *path)
     if (notmuch->path[strlen (notmuch->path) - 1] == '/')
        notmuch->path[strlen (notmuch->path) - 1] = '\0';
 
+    notmuch->mode = mode;
     try {
-       notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path,
-                                                          Xapian::DB_CREATE_OR_OPEN);
+       if (mode == NOTMUCH_DATABASE_MODE_WRITABLE) {
+           notmuch->xapian_db = new Xapian::WritableDatabase (xapian_path,
+                                                              Xapian::DB_CREATE_OR_OPEN);
+       } else {
+           notmuch->xapian_db = new Xapian::Database (xapian_path);
+       }
        notmuch->query_parser = new Xapian::QueryParser;
        notmuch->term_gen = new Xapian::TermGenerator;
        notmuch->term_gen->set_stemmer (Xapian::Stem ("english"));
@@ -521,7 +530,8 @@ notmuch_database_open (const char *path)
 void
 notmuch_database_close (notmuch_database_t *notmuch)
 {
-    notmuch->xapian_db->flush ();
+    if (notmuch->mode == NOTMUCH_DATABASE_MODE_WRITABLE)
+       (static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db))->flush ();
 
     delete notmuch->term_gen;
     delete notmuch->query_parser;
@@ -567,11 +577,18 @@ notmuch_database_set_timestamp (notmuch_database_t *notmuch,
                                const char *key, time_t timestamp)
 {
     Xapian::Document doc;
+    Xapian::WritableDatabase *db;
     unsigned int doc_id;
     notmuch_private_status_t status;
     notmuch_status_t ret = NOTMUCH_STATUS_SUCCESS;
     char *db_key = NULL;
 
+    if (notmuch->mode == NOTMUCH_DATABASE_MODE_READONLY) {
+       fprintf (stderr, "Attempted to update a read-only database.\n");
+       return NOTMUCH_STATUS_READONLY_DATABASE;
+    }
+
+    db = static_cast <Xapian::WritableDatabase *> (notmuch->xapian_db);
     db_key = timestamp_db_key (key);
 
     try {
@@ -586,9 +603,9 @@ notmuch_database_set_timestamp (notmuch_database_t *notmuch,
            doc.add_term (term);
            talloc_free (term);
 
-           notmuch->xapian_db->add_document (doc);
+           db->add_document (doc);
        } else {
-           notmuch->xapian_db->replace_document (doc_id, doc);
+           db->replace_document (doc_id, doc);
        }
 
     } catch (Xapian::Error &error) {