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啟動停止服務並通過python腳本關閉

[英]Start stop service and shutdown through python script

 原文  2015-02-24 09:39:04  0   3    python/ html/ raspberry-pi

問題描述

首先，我在這里完全是菜鳥，請問如果這是一個愚蠢的問題或違反了某些網絡禮節規則。這是我在UNIX /編程世界中最想嘗試的嘗試，目的是使網絡攝像頭機器人成為樹莓派。 我想通過網頁/ python腳本來控制它。 我正在嘗試按照本教程http://blog.ramon.no/2013/06/build-simple-internet-受控-webcam.html

我設置了帶有運動的樹莓而不是mjpeg-streamer來在網頁上流式傳輸。現在，我試圖停止啟動流並從網頁上關閉樹莓。 這是我在論壇上閱讀后得出的結論，但是無效。 我設法連續三次關閉了覆盆子，但是我改變了一些東西，現在我做不了了 

elif action == "shutdown":
print "Attempting to shut down"
call(["sudo", "shutdown", "-h", "now"])
elif action == "startstream":
    import os
os.system("sudo service motion start")
elif action == "stopstream":
    import os
os.system("sudo service motion stop" )

如果我按下開始/停止流，如果我按下關閉，則什么也沒有發生，我收到500錯誤

我授予了www用戶權利 

sudo nano /etc/sudoers
www-data ALL=(ALL) NOPASSWD: ALL

使腳本執行 

chmod +x rambot.py

這是Apache錯誤日志 

[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5]   ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:38 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:39 2015] [error] [client 192.168.0.5] File does not exist: /var/www/css, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]    ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5]   ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:37:41 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:18 2015] [error] [client 192.168.0.5] File does not exist: /var/www/css, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]     elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]        ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5]  , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] SyntaxError, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] : , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:19 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] elif action == "stopstream":, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5]        ^, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] SyntaxError: invalid syntax, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:38:59 2015] [error] [client 192.168.0.5] Premature end of script headers: rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5]   File ", referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5] /usr/lib/cgi-bin/rambot.py, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5] ", line , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5] 87, referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5] , referer: http://192.168.0.10:8083/
[Tue Feb 24 09:39:01 2015] [error] [client 192.168.0.5]     , referer: http://192.168.0.10:8083/

3 個解決方案

解決方案1
 2 已采納  2015-02-24 09:55:09

我看到縮進方式已經過去了。 如果不是錯字，請縮進如下： 

elif action == "shutdown":
    print "Attempting to shut down"
    call(["sudo", "shutdown", "-h", "now"])
elif action == "startstream":
    import os
    os.system("sudo service motion start")
elif action == "stopstream":
    import os
    os.system("sudo service motion stop" )

如果這不是問題，抱歉，我不確定。

解決方案2
 0  2015-02-24 09:55:09

您可以使用OS庫中包含的流程管理功能來實現：

http://docs.python.org/2/library/os.html#process-managment

解決方案3
 0  2015-02-24 10:33:50

建議使用子進程模塊執行命令，而不是使用os.system（）函數。 參考： https : //docs.python.org/2/library/os.html#os.system

子流程模塊提供了更強大的功能來生成新流程並檢索其結果。 使用該模塊優於使用此功能

此外，在腳本開始時加載所需的模塊是更標准的。

你可以這樣： 

import subprocess
[...]
elif action == "shutdown":
    print "Attempting to shut down"
    return_code = subprocess.call(['sudo', 'shutdown', '-h', 'now'])
elif action == "startstream":
    return_code = subprocess.call(['sudo', 'service', 'motion', 'start'])
elif action == "stopstream":
    return_code = subprocess.call(['sudo', 'service', 'motion', 'stop'])

如果要獲取命令的輸出，則可以使用subprocess.check_output()代替subprocess.call() ： 

cmd_output = subprocess.check_output(['sudo', 'service', 'apache2', 'status']) 
print(cmd_output)
cmd_output = cmd_output.decode('utf-8').strip('\n\r')
print(cmd_output)

打印： 

b'Apache2 is running (pid 2024).\n'
Apache2 is running (pid 2024).

注意：我僅使用python3，希望這里使用python2不會有任何區別。

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