win10 在git bash上使用docker

想在win10上装MySQL，才发现是个大坑，各种报错，只好用docker在win10上运行MySQL

>>> docker pull mysql
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/library/mysql/manifests/latest: unauthorized: incorrect username or password

报错，需要login一下

>>> docker login
Authenticating with existing credentials...
Stored credentials invalid or expired
Error: Cannot perform an interactive login from a non TTY device

报错，需要winpty login一下

>>> winpty docker login
Authenticating with existing credentials...
Stored credentials invalid or expired
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
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为什么要用winpty，可以看这里