So indeed, the script contains this code:
first_mapping = [True]
def mapping_callback(value, first_mapping):
if not value:
return (True, [])
if first_mapping[0]:
first_mapping[0] = False
return (False, value)
return (True, value)
def get_default_value_for(settings, key):
return settings.get_mapped(UNITY_LAUNCHER_FAVORITE_KEY, mapping_callback,
first_mapping)
Which looks like it's fine because of:
if not value:
return (True, [])
but for some reason, the python bindings are unable to deal with this.
Running the script gives warnings like so:
** (process:21913): WARNING **: (pygi-
argument.c:903):_pygi_argument_from_object: runtime check failed:
(transfer == GI_TRANSFER_NOTHING)
before crashing with the error from the previous comment.
An easier way of getting the default value of a key (and the one most commonly
used by other developers) is this pattern:
1) create a GSettings object
2) .delay()
3) .reset('key')
4) .get('key')
5) free the object without calling .apply()
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https://bugs.launchpad.net/bugs/1206314
Title:
install-default-webapps-in-launcher.py crashed with signal 5 in
g_settings_get_mapped()
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