将tarfile读入BytesI

Question

我正在使用Docker-pyAPI来处理和操作Docker容器。在API中，put_archive()函数期望data字段以字节为单位。 因此，使用tarfile库，我有：

import tarfile
import io

container = client.create_container(image="myimage", command="/bin/bash")
source = "~/.ssh/id_rsa.pub"
tarfile = create_tar_file(path=source, name="keys.tar")
# tarfile = "keys.tar"
# How can I read the tar file was a BytesIO() object?
data = io.BytesIO()
client.put_archive(container=container, path="/tmp", data=data)

API说：

put_archive(container, path, data)

    Insert a file or folder in an existing container using a tar archive as source.

Parameters:

container (str) – The container where the file(s) will be extracted.
path (str) – Path inside the container where the file(s) will be extracted. Must exist.
data (bytes) – tar data to be extracted

Returns: True if the call succeeds.

Return type: (bool)

Raises: docker.errors.APIError – If the server returns an error.

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我的问题是：

如何将tar文件作为BytesIO()读取，以便将其传递给put_archive()函数？

Answer 1

您可以这样做（未经测试，因为我没有安装Docker-py）：

with open('keys.tar', 'rb') as fin:
    data = io.BytesIO(fin.read())