NormalPyRunner 0.1.2

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[Normal]PyRunner

PyRunner allows you to run shell commands from Python in a way similar to how it is happening inside shell scripts

The following features apply:

• you don't think about separation of arguments and command; entire string is executed instead
• you don't think if command is built-in or external
• output of a command to either stdout or stderr is printed into appropriate stream and visible to user (until muted)
• called command is printed
• commands can be called with sudo and the password for the current user will be asked once
• entire script can be called with sudo and the password, asked by sudo command, will be in effect
• the result of a command can be grabbed, including stdout, stderr and return code

The idea is to completely avoid boilerplate coding when writing shell automation scripts in Python.

Examples

Importing library

>>> import pyrunner

Calling ls command

>>> _=pyrunner.exec("ls")
$ 'ls'
examples.py
__pycache__
pyrunner.py
README.md
setup.py

Note _= is used for Python REPL to suppress result printing.

Note command is printed with $ prefix.

Collecting command output as a whole string

>>> hostname=pyrunner.exec("hostname")
$ 'hostname'
myhost
>>> print(hostname)
myhost

Collecting command output as a list of strings

>>> files = []
>>> _=pyrunner.exec("ls", out_lines=files)
$ 'ls'
mnt
__pycache__
pyrunner.py
README.md
setup.py
>>> files
['mnt', '__pycache__', 'pyrunner.py', 'README.md', 'setup.py', '']

Suppressing printouts

>>> pyrunner.exec("ls", mute_out=True)
$ 'ls'
'mnt\n__pycache__\npyrunner.py\nREADME.md\nsetup.py'

Calling uname command with arguments

>>> _=pyrunner.exec("uname -a")
$ 'uname -a'
Linux myhostname 5.15.0-86-generic #96-Ubuntu SMP Wed Sep 20 08:23:49 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Calling sudo command (mount)

>>> _=pyrunner.exec("mount /dev/loop46 mnt", sudo=True)
$ sudo mount /dev/loop46 mnt
[sudo] password for myuser:
mount: /home/myuser/mypath/pyrunner/mnt: WARNING: source write-protected, mounted read-only.

Note sudo=True is used to initiate sudo operations.

Note command is now prefixed with $ sudo

Checking mount is worked

>>> _=pyrunner.exec("ls mnt")
$ 'ls mnt'
bin
chromium.png
etc
firstrun
lib
man1
meta
snap
tests
usr

showing some image content.

Unmounting

>>> _=pyrunner.exec("umount mnt", sudo=True)
$ sudo umount mnt

Note password is not asked.

Security notes

Password is stored in Python variable. It is okay with standalone scripts, but can be not okay with interactive shells like Jupyter. sudoers check is not supported yet.