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-rw-r--r--src/buildstream/_project.py6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/buildstream/_project.py b/src/buildstream/_project.py
index 3c3dc566f..2793b161a 100644
--- a/src/buildstream/_project.py
+++ b/src/buildstream/_project.py
@@ -815,9 +815,9 @@ class Project():
_yaml.node_validate(mirror, allowed_mirror_fields)
mirror_name = mirror.get_str('name')
alias_mappings = {}
- for alias_mapping, uris in _yaml.node_items(mirror.get_mapping('aliases')):
- assert isinstance(uris, list)
- alias_mappings[alias_mapping] = list(uris)
+ for alias_mapping, uris in mirror.get_mapping('aliases').items():
+ assert type(uris) is _yaml.SequenceNode # pylint: disable=unidiomatic-typecheck
+ alias_mappings[alias_mapping] = uris.as_str_list()
output.mirrors[mirror_name] = alias_mappings
if not output.default_mirror:
output.default_mirror = mirror_name