After a failed LUKS unlock attempt the password entry dialog shows the
error "Failed to open LUKS encryption". Improve the user experience by
clearing that error message at the start of the next attempt to avoid
contradictory information with the main windows status of "Opening
encryption on $PARTITION" whilst performing the next unlock attempt.
Bug 795617 - Implement opening and closing of LUKS mappings
Reports generic GParted error "Failed to open LUKS encryption" on any
failure unlocking the partition. Choosing not to display cryptsetup
reported errors because those messages and their translations are not
under GParted control.
Bug 795617 - Implement opening and closing of LUKS mappings
The underlying C coded Gtk Entry widget is careful to zero memory after
use, allowing the widget to be safely used for password entry [1].
However the C++ method Gtk::Entry::get_text() just takes the underlying
C string from the Gtk Entry widget and copies it when constructing a
Glib::ustring for the return value [2].
So directly use the Gtk/C API to get the C string instead.
[1] https://git.gnome.org/browse/gtk+/tree/gtk/gtkentrybuffer.c?h=3.22.28#n92
See function trash_area() which zeros memory and its use in
gtk_entry_buffer_normal_insert_text(),
gtk_entry_buffer_normal_delete_text() and
gtk_entry_buffer_finalize().
[2] https://git.gnome.org/browse/gtkmm/tree/gtk/src/entry.hg?h=3.22.2#n104
_WRAP_METHOD(Glib::ustring get_text() const, gtk_entry_get_text)
https://git.gnome.org/browse/glibmm/tree/docs/internal/using_gmmproc.txt?h=2.46.1#n53
_WRAP_METHOD(Glib::ustring METHOD const, FUNC) is processed to:
Glib::ustring METHOD() const
{
return Glib::convert_const_gchar_ptr_to_ustring(
FUNC(const_cast<GtkEntry*>(gobj())));
}
https://git.gnome.org/browse/glibmm/tree/glib/glibmm/utility.h?h=2.46.1#n82
Glib::ustring convert_const_gchar_ptr_to_ustring(const char* str)
{
return (str) ? Glib::ustring(str) : Glib::ustring();
}
So Gtk::Entry::get_text() calls Glib::ustring() constructor which
copies the C string to create the Glib::ustring object returned.
Bug 795617 - Implement opening and closing of LUKS mappings
Initial addition of a password entry dialog. Looks like:
+------------------------------------------------+
| LUKS Passphrase /dev/sdb1 |
+------------------------------------------------+
| Enter LUKS passphrase to open /dev/sdb1 |
| Passphrase: [ ] |
| |
| [ Cancel ] [ Unlock ] |
+------------------------------------------------+
A standard Gtk Dialog is used to accept the password once, with any
errors displayed in a separate error dialog afterwards. This is poor UI
design. A password dialog should remain open for all authentication
attempts and only close when successful or the dialog is cancelled or
closed. This UI design issue will be improved in following commits.
Bug 795617 - Implement opening and closing of LUKS mappings
Mike Fleetwood