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Fix serious bug in merge_dicts where the original dict would be modified

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This commit is contained in:
Anders Ingemann 2014-12-20 23:18:27 +01:00
parent 70c282e804
commit 8bb34c604b
1 changed files with 17 additions and 5 deletions
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22
tests/integration/manifests/__init__.py
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@ -29,9 +29,21 @@ def merge_manifest_data(standard_partials=[], custom=[]):
# Snatched from here: http://stackoverflow.com/a/7205107
def merge_dicts(*args):
def merge(a, b, path=None):
if path is None:
path = []
def clone(obj):
copy = obj
if isinstance(obj, dict):
copy = {}
for key, value in obj.iteritems():
copy[key] = clone(value)
if isinstance(obj, list):
copy = []
copy.extend(obj)
if isinstance(obj, set):
copy = set()
copy.update(obj)
return copy
def merge(a, b, path=[]):
for key in b:
if key in a:
if isinstance(a[key], dict) and isinstance(b[key], dict):
@ -39,8 +51,8 @@ def merge_dicts(*args):
elif a[key] == b[key]:
pass
else:
raise Exception('Conflict at %s' % '.'.join(path + [str(key)]))
raise Exception('Conflict at `{path}\''.format(path='.'.join(path + [str(key)])))
else:
a[key] = b[key]
a[key] = clone(b[key])
return a
return reduce(merge, args, {})