print("failed to get cert file for nginx service: {0}",ret.stdout)
# The acceptable json content would be like:
# {
# "projects": [
# {
# "localpath": "xxxx",
# "http_url": ""
# },
# {
# "localpath": "xxxx",
# "http_url": ""
# }
# ]
# }
# 'update_repo' will download every rpm packages (overwrite if it exists) specified in 'http_url' root folder via wget tool and the rpm will be arranged in the format of