Add prerequisite checking before startup

4 files changed, 59 insertions, 8 deletions

diff --git a/portato/gui/__init__.py b/portato/gui/__init__.py
index 5bbe4c8..e3f1172 100644
--- a/portato/gui/__init__.py
+++ b/portato/gui/__init__.py
@@ -3,7 +3,7 @@
 # File: portato/gui/__init__.py
 # This file is part of the Portato-Project, a graphical portage-frontend.
 #
-# Copyright (C) 2006-2008 René 'Necoro' Neumann
+# Copyright (C) 2006-2009 René 'Necoro' Neumann
 # This is free software.  You may redistribute copies of it under the terms of
 # the GNU General Public License version 2.
 # There is NO WARRANTY, to the extent permitted by law.
@@ -12,8 +12,10 @@
 
 from __future__ import absolute_import
 
-from .. import get_listener
+from ..helper import error
 from .exception_handling import register_ex_handler
+from .exceptions import PreReqError
+from .dialogs import prereq_error_dialog
 
 def run ():
     from .windows.splash import SplashScreen
@@ -23,6 +25,11 @@ def run ():
     s.show()
     
     from .windows.main import MainWindow
-    m = MainWindow(s)
-    s.hide()
-    m.main()
+    try:
+        m = MainWindow(s)
+        s.hide()
+        m.main()
+    except PreReqError, e:
+        error("Prerequisite not matched. Aborting.")
+        prereq_error_dialog(e)
+        s.hide()
diff --git a/portato/gui/dialogs.py b/portato/gui/dialogs.py
index f178d2b..edf34b7 100644
--- a/portato/gui/dialogs.py
+++ b/portato/gui/dialogs.py
@@ -3,7 +3,7 @@
 # File: portato/gui/dialogs.py
 # This file is part of the Portato-Project, a graphical portage-frontend.
 #
-# Copyright (C) 2006-2008 René 'Necoro' Neumann
+# Copyright (C) 2006-2009 René 'Necoro' Neumann
 # This is free software.  You may redistribute copies of it under the terms of
 # the GNU General Public License version 2.
 # There is NO WARRANTY, to the extent permitted by law.
@@ -106,3 +106,10 @@ def file_chooser_dialog (title, parent):
 
     fc.destroy()
     return ret
+
+def prereq_error_dialog (e):
+    dialog = gtk.MessageDialog(None, gtk.DIALOG_MODAL, gtk.MESSAGE_ERROR, gtk.BUTTONS_OK, _("A prerequisite for starting Portato was not matched."))
+    dialog.format_secondary_text(e.message)
+    ret = dialog.run()
+    dialog.destroy()
+    return ret
diff --git a/portato/gui/exceptions.py b/portato/gui/exceptions.py
new file mode 100644
index 0000000..11bc83d
--- /dev/null
+++ b/portato/gui/exceptions.py
@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+#
+# File: portato/gui/exceptions.py
+# This file is part of the Portato-Project, a graphical portage-frontend.
+#
+# Copyright (C) 2009 René 'Necoro' Neumann
+# This is free software.  You may redistribute copies of it under the terms of
+# the GNU General Public License version 2.
+# There is NO WARRANTY, to the extent permitted by law.
+#
+# Written by René 'Necoro' Neumann <necoro@necoro.net>
+
+
+"""Arbitrary exceptions."""
+
+class PreReqError (Exception):
+    pass
diff --git a/portato/gui/windows/main.py b/portato/gui/windows/main.py
index 08c2033..970dcba 100644
--- a/portato/gui/windows/main.py
+++ b/portato/gui/windows/main.py
@@ -3,7 +3,7 @@
 # File: portato/gui/windows/main.py
 # This file is part of the Portato-Project, a graphical portage-frontend.
 #
-# Copyright (C) 2006-2008 René 'Necoro' Neumann
+# Copyright (C) 2006-2009 René 'Necoro' Neumann
 # This is free software.  You may redistribute copies of it under the terms of
 # the GNU General Public License version 2.
 # There is NO WARRANTY, to the extent permitted by law.
@@ -38,6 +38,7 @@ from ..views import LogView, HighlightView, InstalledOnlyView, LazyStoreView
 from ..dialogs import (blocked_dialog, changed_flags_dialog, io_ex_dialog,
         nothing_found_dialog, queue_not_empty_dialog, remove_deps_dialog,
         remove_queue_dialog, remove_updates_dialog, unmask_dialog)
+from ..exceptions import PreReqError
 
 # even more GUI stuff
 from .basic import Window, Popup
@@ -424,6 +425,8 @@ class MainWindow (Window):
         @type splash: SplashScreen
         """
 
+        self.check_prereqs()
+
         if splash is None:
             splash = lambda x: True
         
@@ -1865,7 +1868,24 @@ class MainWindow (Window):
         Calls main_quit().
         """
         gtk.main_quit()
-    
+
+    def check_prereqs (self):
+
+        def fail (m):
+            error("PreReqError: %s", m)
+            raise PreReqError(m)
+
+        pdir = system.get_global_settings("PORTDIR")
+
+        if not os.path.exists(pdir):
+            fail(_("The portage tree is not existing."))
+
+        ls = os.listdir(system.get_global_settings("PORTDIR"))
+        if not "eclass" in ls:
+            fail(_("The portage tree seems to be empty."))
+
+        debug("All prereqs matched. Fine :)")
+
     def main (self):
         """
         Main.