Question

我正在尝试在我的python脚本中运行一个bash脚本，我确信有一种方法可以做我的bash脚本在python中所做的事情，但我更专注于让它工作。

以下是我以root身份运行的代码，后跟错误：

import subprocess
#variable = subprocess.check_output('dmidecode', shell=True)
#print(variable)
#run program once as root then cron it as root
try :
    file = open("/var/log/serialcontrol/dmidecode.txt", "r")
except FileNotFoundError:
    file = open('/var/tmp/serialcontrol.bash', 'w') 
    file.write("#!/bin/bash/\nif [ ! -d /var/log/serialcontrol/]\nthen\n\tmkdir /var/log/serialcontrol/\nfi");
    file.close()
    subprocess.call("/var/tmp/serialcontrol.bash")

继承错误

Traceback (most recent call last):
  File "/home/trisimix/serialcontrol/serialcontrol.py", line 6, in <module>
    file = open("/var/log/serialcontrol/dmidecode.txt", "r")
FileNotFoundError: [Errno 2] No such file or directory: '/var/log/serialcontrol/dmidecode.txt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/trisimix/serialcontrol/serialcontrol.py", line 11, in <module>
    subprocess.call("/var/tmp/serialcontrol.bash")
  File "/usr/lib/python3.5/subprocess.py", line 557, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.5/subprocess.py", line 1551, in _execute_child
    raise child_exception_type(errno_num, err_msg)
PermissionError: [Errno 13] Permission denied

Answer 1

您在处理/var/tmp/serialcontrol.bash时创建的FileNotFoundError文件不可执行。在尝试使用subprocess执行它之前，先使其可执行。

import subprocess
import os
import stat

#variable = subprocess.check_output('dmidecode', shell=True)
#print(variable)
#run program once as root then cron it as root
try :
    file = open("/var/log/serialcontrol/dmidecode.txt", "r")
except FileNotFoundError:
    script = '/var/tmp/serialcontrol.bash'
    with open(script, 'w') as file:
        file.write("#!/usr/bin/env bash/\nif [ ! -d /var/log/serialcontrol/]\nthen\n\tmkdir /var/log/serialcontrol/\nfi");

    st = os.stat(script)
    os.chmod(script, st.st_mode | stat.S_IEXEC)

    subprocess.call(script)

正如@anishsane在评论中指出的那样，chmod - 脚本的另一种替代方法就是这样调用它，然后放弃chmod：

subprocess.call(["/bin/bash", script])

实际上，如果我们可以假设bash在PATH上，那么这将更加便携：

subprocess.call(["bash", script])

尝试在子流程中调用bash脚本时，我被拒绝了

1 个答案: