From 04d6ca3a49ec52e59a9afdc0dd8d6fea8f2c4d7f Mon Sep 17 00:00:00 2001
From: Nick Hall <nick-h@gramps-project.org>
Date: Thu, 22 Mar 2018 23:02:00 +0000
Subject: [PATCH] Disable family tree manager features when a backend is
 unavailable

If the default backend is unavailable, then reset it to bsddb.
---
 gramps/cli/clidbman.py |  3 ++-
 gramps/gui/dbman.py    | 12 +++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/gramps/cli/clidbman.py b/gramps/cli/clidbman.py
index 7e79a922f..63335f1bd 100644
--- a/gramps/cli/clidbman.py
+++ b/gramps/cli/clidbman.py
@@ -70,6 +70,7 @@ DEFAULT_TITLE = _("Family Tree")
 NAME_FILE = "name.txt"
 BACKEND_FILE = "database.txt"
 META_NAME = "meta_data.db"
+UNAVAILABLE = _('Unavailable')
 
 #-------------------------------------------------------------------------
 #
@@ -183,7 +184,7 @@ class CLIDbManager:
         for plugin in pmgr.get_reg_databases():
             if plugin.id == dbid:
                 return plugin._name
-        return _("Unknown")
+        return UNAVAILABLE
 
     def print_family_tree_summaries(self, database_names=None):
         """
diff --git a/gramps/gui/dbman.py b/gramps/gui/dbman.py
index 03b158276..fb6ae0d1b 100644
--- a/gramps/gui/dbman.py
+++ b/gramps/gui/dbman.py
@@ -57,7 +57,7 @@ from gramps.gen.const import URL_WIKISTRING, URL_MANUAL_PAGE
 from .user import User
 from .dialog import ErrorDialog, QuestionDialog, QuestionDialog2, ICON
 from .pluginmanager import GuiPluginManager
-from gramps.cli.clidbman import CLIDbManager, NAME_FILE, time_val
+from gramps.cli.clidbman import CLIDbManager, NAME_FILE, time_val, UNAVAILABLE
 from .managedwindow import ManagedWindow
 from .ddtargets import DdTargets
 from gramps.gen.recentfiles import rename_filename, remove_filename
@@ -313,6 +313,12 @@ class DbManager(CLIDbManager, ManagedWindow):
             self.connect_btn.set_sensitive(False)
             if _RCS_FOUND:
                 self.rcs_btn.set_sensitive(True)
+        elif store.get_value(node, BACKEND_COL) == UNAVAILABLE:
+            self.close_btn.set_sensitive(False)
+            self.convert_btn.set_sensitive(False)
+            self.connect_btn.set_sensitive(False)
+            self.rcs_btn.set_sensitive(False)
+            self.repair_btn.set_sensitive(False)
         else:
             self.close_btn.set_sensitive(False)
             dbid = config.get('database.backend')
@@ -361,6 +367,10 @@ class DbManager(CLIDbManager, ManagedWindow):
         # Put some help on the buttons:
         dbid = config.get('database.backend')
         backend_type = self.get_backend_name_from_dbid(dbid)
+        if backend_type == UNAVAILABLE:
+            dbid = 'bsddb'
+            config.set('database.backend', dbid)
+            backend_type = self.get_backend_name_from_dbid(dbid)
         self.new_btn.set_tooltip_text(backend_type)
 
         # build the database name column