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如何从内存运行python中的shell脚本?

popen sh subprocess shell python

Mykhailo Seniutovych · 技术社区 · 7 年前

import subprocess

script = retrieve_script()
popen = subprocess.Popen(scrpit, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
stdOut, stdErr = popen.communicate()

def retrieve_script_content():
    # in reality I retrieve a shell script content from network,
    # but for testing purposes I will just hardcode some test content here
    return "echo command1" + "\n" + "echo command2" + " \n" + "echo command3"

此代码段将不起作用,因为 subprocess.Popen

有没有其他方法可以从内存运行shell脚本?

3 回复 | 直到 7 年前

that other guy 7 年前

此代码段将不起作用,因为subprocess.Popen希望您一次只提供一个命令。

事实并非如此。相反,它不起作用的原因是:

retrieve_script
retrieve_script_content 而不是 检索\u脚本
你拼错了 script 作为 scrpit

把它们修好就好了:

import subprocess

def retrieve_script():
    return "echo command1" + "\n" + "echo command2" + " \n" + "echo command3"

script = retrieve_script()
popen = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
stdOut, stdErr = popen.communicate()
print(stdOut);

$ python foo.py
command1
command2
command3

但是,请注意,这将忽略shebang(如果有的话),并使用系统的 sh 每一次。

unutbu 7 年前

use a virtual filesystem 制作一个类似内存文件的对象 subprocess.Popen :

import subprocess
import tempfile
import os
import stat

def retrieve_script_content():
    # in reality I retrieve a shell script content from network,
    # but for testing purposes I will just hardcode some test content here
    return "echo command1" + "\n" + "echo command2" + " \n" + "echo command3"

content = retrieve_script_content()
with tempfile.NamedTemporaryFile(mode='w', delete=False, dir='/dev/shm') as f:
    f.write(content)
    os.chmod(f.name, stat.S_IRUSR | stat.S_IXUSR)
    # print(f.name)
popen = subprocess.Popen(f.name, stdout=subprocess.PIPE, stderr=subprocess.PIPE, 
                         shell=True)
stdOut, stdErr = popen.communicate()

print(stdOut.decode('ascii'))
# os.unlink(f.name)

印刷品

command1
command2
command3

/dev/shm 作为虚拟文件系统 Linux systems based on Glibc always have a tmpfs mounted on /dev/shm . setup a ramfs .

您可能希望使用虚拟文件而不是 passing the script contents directly to subprocess.Popen limited to 131071 bytes .

Serge 7 年前

可以使用Popen执行多命令脚本。当shell标志为False时,Popen仅将您限制为一个命令字符串,但是可以传递命令列表。 Popen 的旗帜 shell=True 允许多命令脚本(这被认为是不安全的,尽管您正在做的事情-从web执行脚本-已经非常危险)。