也许可以使用get-diff API，从那里可以导出原始文件内容

Gerrit应该得到本地人的支持...
但这里是如何在python中欺骗它返回任意给定{tag，分支，commit}处的任意文件：

# pip install python-gerrit-api
from gerrit import GerritClient
import base64

client = GerritClient(
    base_url=url,
    username=username,
    password=password
)
# `project` is project name
# `version` is tag/branch/commit
# `path` is path to a file, relative to project root
b64 = client.gitiles.gerrit.get(client.gitiles.endpoint+ f"/{project}/+/{version}/{path}", params={"format": "TEXT"})
content = base64.b64decode(b64)