通过Web服务器调用函数时为什么不执行函数？

Question

There is a python script:

#!/usr/bin/env python
import sys
import subprocess

subprocess.call("sudo /var/www/scripts/setPwm "+ sys.argv[1],shell=True)
print ("Content-type: text/plain;charset=utf-8\n\n")
print("sudo /var/www/scripts/setPwm "+ sys.argv[1])
print("ok\n")

When run locally it lights up a LED with specified intensity. When called through a website it prints all correctly, but the LED does not light up.

When I call

http://sauna/scripts/setLED.py?1000

this is printed:

sudo /var/www/scripts/setPwm 1000
ok

so the argument is apparently passed correctly, there are also no errors in apache log. Still there is no light :(

Answer 1

问题是，apache服务器与我的用户（ www-data ）是不同的用户。将用户（ www-data ）添加到/etc/sudoers以获取需要以root用户身份运行的特定可执行文件。