diff options
Diffstat (limited to 'buildstream/element.py')
| -rw-r--r-- | buildstream/element.py | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/buildstream/element.py b/buildstream/element.py index 40cac47cd..a34b1ca36 100644 --- a/buildstream/element.py +++ b/buildstream/element.py @@ -1229,6 +1229,12 @@ class Element(Plugin): # Prepend provenance to the error raise ElementError("{}: {}".format(self, e), reason=e.reason) from e + # Ensure that the first source does not need access to previous soruces + if self.__sources and self.__sources[0]._requires_previous_sources(): + raise ElementError("{}: {} cannot be the first source of an element " + "as it requires access to previous sources" + .format(self, self.__sources[0])) + # Preflight the sources for source in self.sources(): source._preflight() @@ -1272,9 +1278,9 @@ class Element(Plugin): # def _track(self): refs = [] - for source in self.__sources: + for index, source in enumerate(self.__sources): old_ref = source.get_ref() - new_ref = source._track() + new_ref = source._track(self.__sources[0:index]) refs.append((source._get_unique_id(), new_ref)) # Complimentary warning that the new ref will be unused. |