def fetch_all(source_repo, target_repo, remote_name=None):
"""Fetch branches and tags from a remote repository
Unlike :code:`git fetch`, this will also update local branches to point at
the same commit as their remote counterpart.
Parameters
----------
source_repo : dulwich.repo.Repo
target_repo : dulwich.repo.Repo
remote_name : str
"""
if remote_name is None:
remote_name = 'origin'
refs = LocalGitClient().fetch(source_repo.path, target_repo)
for key, value in refs.items():
remote_key = key.replace(
b'heads', b'remotes/%s' % bytes(remote_name, encoding='UTF-8'))
target_repo.refs[remote_key] = value
target_repo[key] = value
