build image error:OSError: unexpected end of data

[YuMiaoPy]

My code is below, I can connect docker server successfuly,but trying to build image fails.

import docker

client = docker.DockerClient(base_url='tcp://47.92.241.134:2375'
,timeout=30,version='1.27',tls=False)
client.login(username='ssyptxz1',password='Siacloud'
,registry='https://registry.cn-zhangjiakou.aliyuncs.com')
f=open('E:\11\Dockerfile.tar', 'r',encoding='utf-8')
client.images.build(fileobj=f
,tag='registry.cn-zhangjiakou.aliyuncs.com/siacloud/sia-app-yumiao:1.2')

outputs:OSError: unexpected end of data
docker server info:
{'Version': '17.03.2-ce', 'ApiVersion': '1.27', 'MinAPIVersion': '1.12', 'GitCommit': 'f5ec1e2', 'GoVersion': 'go1.6.2', 'Os': 'linux', 'Arch': 'amd64', 'KernelVersion': '4.4.0-117-generic', 'BuildTime': '2018-07-05T23:07:48.822836586+00:00'}

[shin-]

The most likely explanation is that your Dockerfile.tar file is either corrupted or doesn't contain the expected data. It's difficult to say for sure without knowing how the file was generated or what it contains, but this is unlikely to be an SDK bug.

[rmdashrfv]

Same thing happens to me. I get the "unexpected end of data" error and I'm definitely giving it an uncorrupted, standard Dockerfile that is confirmed to work. Nothing doing. It'd be great to see an example of this python library in use.

@shin- would you mind providing a line that you know is working? I know the Readme for this repo hasn't been updated in a couple years

Edit: Just so that it's clear what I'm doing ...

import docker
client = docker.from_env() # this works, and I can list my existing images
d = open('./Dockerfile') # valid Dockerfile

img = client.images.build(fileobj=d) # throws unexpected end of data
img = client.images.build(path='.')   # throws Unauthorized: Incorrect username or password

Has anyone actually built an image with this library?

Answer: For those coming later, I was able to fix my problem by feeding the bytes into the .build() method. Definitely would be helpful to mention that in the docs. I thought that by a "file-like object" you meant any object that's like a file.

My solution was changing the above line to:
d = open('./Dockerfile', mode='rb')