gliderlabs/docker-alpine

Python2 cannot read keyboard input device

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#206 建立於 2016年8月22日

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描述

I'm trying to read usb keyboard inside alpine docker container.

Run container

# docker run --privileged --rm -it -v /dev/input:/dev/input alpine sh

/ # ls /dev/input/by-path/
pci-0000:00:01.2-usb-0:1:1.0-event-mouse  platform-i8042-serio-1-event-mouse
pci-0000:00:01.2-usb-0:1:1.0-mouse        platform-i8042-serio-1-mouse
platform-i8042-serio-0-event-kbd          platform-pcspkr-event-spkr

Run python2 (Raise error)

/ # apk add -U python
/ # python
Python 2.7.12 (default, Jun 29 2016, 08:57:23)
[GCC 5.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> kbd = open('/dev/input/by-path/platform-i8042-serio-0-event-kbd', 'rb')
>>> kbd.read(16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 22] Invalid argument
>>> exit()

Run python3 (No error)

/ # apk add python3
/ # python3
Python 3.5.1 (default, May 30 2016, 16:01:04)
[GCC 5.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> kbd = open('/dev/input/by-path/platform-i8042-serio-0-event-kbd', 'rb')
>>> kbd.read(16)
^C

貢獻者指南

技術棧
pythondocker
領域
infrastructure
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Basic Python knowledgeFamiliarity with Docker
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
70
研究方向
Investigate the difference between Python2 and Python3 file reading behavior on Linux input devices. Check if the Python2 package in Alpine is missing unbuffered mode or uses different flags. Look at the open() call with 'rb' mode; Python2 might require a different buffer size or device specific handling. Consider updating to Python3 or patching the Python2 package.