OSError: [Errno 13] 权限被拒绝 Python subprocess.call() [英] OSError: [Errno 13] Permission denied Python subprocess.call()

问题描述

我正在尝试在 python 中运行一个子进程，但我收到错误消息:OSError: [Errno 13] 权限被拒绝

I'm trying to run a subprocess in python but I get error message: OSError: [Errno 13] Permission denied

cp2 = cp2.lstrip("~")
cp2 = wilixdirectory+"/Users/"+loggedusr+cp2 
    if cp3 == None:
    subprocess.call([cp2])
else:
    subprocess.call([cp2, cp3])

cp2 和 cp3 是目录的用户输入

cp2 and cp3 are user inputs for directories

wilixdirectory 是一个目录

wilixdirectory is a directory

loggedusr 是一个像 "Bob" 或 "Joe" 这样的字符串

loggedusr is a string like "Bob" or "Joe"

代码在 Unix 上用完了

The code is running out of Unix

推荐答案

不要假设路径以斜杠开头，并使用 + 连接，而是使用 os.path.join() 创建路径:

Instead of assuming the path starts with a slash, and concatenating using +, use os.path.join() to create the path:

import os.path

basepath = os.path.join(wilixdirectory, 'Users', loggedusr)
cp2 = cp2.lstrip('~/')
cp2 = os.path.abspath(os.path.join(basepath, cp2))
if not cp2.startswith(basepath + os.path.pathsep):
    # something is wrong still, the absolute final path is not inside of
    # user directory, bail now.
    raise ValueError('Not a valid command')

# Perhaps test if os.path.isfile(cp2) is True?

args = [cp2]
if cp3 is not None:
    args.append[cp3]

subprocess.call(args)

请注意，我从 cp2 的开头去除了 ~ 和 / 以从用户输入中删除任何意外的开始字符，然后使用os.path.abspath() 以确保路径是规范路径，并且解析了任何 ./ 和 ../ 条目.您做然后需要验证最终结果是否仍在用户的目录中，而不是在用户目录之外.

Note that I strip ~, and / from the start of cp2 to remove any accidental start characters from the user input, then use os.path.abspath() to make sure the path is a canonical path, with any ./ and ../ entries resolved. You do then need to verify that the final result is still within the users' directory and not outside of it.

在运行 subprocess.call() 之前，您可以使用 os.path.isfile() 进行测试以查看 cp2 路径是否实际指向实际文件.

You could test with os.path.isfile() to see if the cp2 path actually points to an actual file before running subprocess.call().

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