使用 apt 模块更新 python 本身

发布于 2024-11-25 06:10:12 字数 589 浏览 1 评论 0原文

我正在编写一个 python 脚本，该脚本将在 EC2 计算机上作为 user-data- 运行脚本。我正在尝试弄清楚如何升级机器上的软件包，类似于 bash 命令：

$ sudo apt-get -qqy update && sudo apt-get -qqy upgrade

我知道我可以使用 python 中的 apt 软件包来执行此操作：

import apt
cache=apt.Cache()
cache.update()
cache.open(None)
cache.upgrade()
cache.commit()

问题是如果 python 本身会发生什么是升级的软件包之一。有没有办法在升级后重新加载解释器和脚本并从中断处继续？

现在我唯一的选择是使用 shell 脚本作为我的用户数据脚本，其唯一目的是升级软件包（可能包括 python），然后将其余代码放入 python 中。我想消除使用 shell 脚本的额外步骤。

原文

I am writing a python script that will run on an EC2 machine as the user-data-script. I'm trying to figure out how I can upgrade the packages on the machine similar to the bash command:

$ sudo apt-get -qqy update && sudo apt-get -qqy upgrade

I know I can use the apt package in python to do this:

import apt
cache=apt.Cache()
cache.update()
cache.open(None)
cache.upgrade()
cache.commit()

Problem is what happens if python itself was one of the packages that was upgraded. Is there a way to reload the interpreter and script following this upgrade and continue where it left off?

Right now my only choice is to use a shell script as my user-data script for the sole purpose of upgrading packages (including possibly python) and then dropping into python for the rest of my code. I'd like to eliminate the extra step of using a shell script.

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泪是无色的血 2024-12-02 06:10:12

我想我已经明白了：

def main():
    import argparse
    parser = argparse.ArgumentParser(description='user-data-script.py: initial python instance startup script')
    parser.add_argument('--skip-update', default=False, action='store_true', help='skip apt package updates')
    # parser.add_argument whatever else you need
    args = parser.parse_args()

    if not args.skip_update:
        # do update
        import apt
        cache = apt.Cache()
        cache.update()
        cache.open(None)
        cache.upgrade()
        cache.commit()

        # restart, and skip update
        import os, sys
        command = sys.argv[0]
        args = sys.argv
        if skipupdate:
            args += ['--skip-update']
        os.execv(command, args)

    else:
        # run your usual code
        pass

if __name__ == '__main__':
    main()

I think I figured it out:

def main():
    import argparse
    parser = argparse.ArgumentParser(description='user-data-script.py: initial python instance startup script')
    parser.add_argument('--skip-update', default=False, action='store_true', help='skip apt package updates')
    # parser.add_argument whatever else you need
    args = parser.parse_args()

    if not args.skip_update:
        # do update
        import apt
        cache = apt.Cache()
        cache.update()
        cache.open(None)
        cache.upgrade()
        cache.commit()

        # restart, and skip update
        import os, sys
        command = sys.argv[0]
        args = sys.argv
        if skipupdate:
            args += ['--skip-update']
        os.execv(command, args)

    else:
        # run your usual code
        pass

if __name__ == '__main__':
    main()

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丶情人眼里出诗心の 2024-12-02 06:10:12

使用链接。

#!/bin/sh
cat >next.sh <<'THEEND'
#!/bin/sh
#this normally does nothing
THEEND
chmod +x next.sh

python dosomestuff.py

exec next.sh

在 Python 应用程序中，您可以编写一个 shell 脚本来执行您需要的操作。在本例中，该 shell 脚本将升级 Python。由于它是在Python关闭后运行的，所以不存在冲突。事实上，next.sh 可以启动同一个（或另一个）Python 应用程序。如果您交替使用两个 shell 脚本 first.sh 和 next.sh，您可以根据需要将任意数量的这些调用链接在一起。

Use chaining.

#!/bin/sh
cat >next.sh <<'THEEND'
#!/bin/sh
#this normally does nothing
THEEND
chmod +x next.sh

python dosomestuff.py

exec next.sh

Inside the Python app, you would write out a shell script to do what you need. In this case, that shell script would upgrade Python. Since it runs after Python has shut down, there is no conflict. In fact, next.sh could start up the same (or another) Python app. If you alternate between two shell scripts first.sh and next.sh you could chain as many of these invocations together as you want.

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