heat_relations.py 文件源码

def upgrade_charm():
    if is_leader():
        # if we are upgrading, then the old version might have used the
        # HEAT_PATH/encryption-key. So we grab the key from that, and put it in
        # leader settings to ensure that the key remains the same during an
        # upgrade.
        encryption_path = os.path.join(HEAT_PATH, 'encryption-key')
        if os.path.isfile(encryption_path):
            with open(encryption_path, 'r') as f:
                encryption_key = f.read()
            try:
                leader_set({'heat-auth-encryption-key': encryption_key})
            except subprocess.CalledProcessError as e:
                log("upgrade: leader_set: heat-auth-encryption-key failed,"
                    " didn't delete the existing file: {}.\n"
                    "Error was: ".format(encryption_path, str(e)),
                    level=WARNING)
            else:
                # now we just delete the file
                os.remove(encryption_path)
    leader_elected()