in python multiple commands using su - user

Question

I'm trying to run commands after running su - username I tried to use:

subprocess.run(['su', '-', str(username)]) #username is var
subprocess.run(['touch', 'test.txt'])

or

run_su = 'su - '+ str(username) #username is var
os.system(run_su)

or

subprocess.call(['su', '-', str(username)]) #username is var
subprocess.call(['touch', 'test.txt'])

or

p1 = subprocess.Popen(['su', '-', str(username)], shell=True, stdout=subprocess.PIPE) #username is var
p2 = subprocess.Popen(['touch', 'test.txt'], stdin=p1.stdout, stdout=subprocess.PIPE)

nothing seems to work for me.

can you suggest a way to do that?

What exactly does not work? Both the first and second variant work here, didn't test the rest. Obviously the touch command will not be executed until the shell you start with su is terminated, and it will not be executed by the su process. You need to pass the command to be executed to su. Why not use a sehllscript? — Jan Christoph Terasa
– Jan Christoph Terasa, Commented May 4, 2021 at 5:48
Probably the easiest thing is to throw the sequence of commands into a temporary file and run that file with sudo. Subprocesses in Python are run in separate shells (and, depending on how you invoke them, may not even involve a shell directly) — Silvio Mayolo
– Silvio Mayolo, Commented May 4, 2021 at 5:48
@JanChristophTerasa I don't get the test.txt file on the username directory like I'm doing it on shell. I don't see the test.txt file anywhere. — Barak
– Barak, Commented May 4, 2021 at 5:51
@Barak The text file will appear after the su command terminates, since it tries to open a new shell. It will either terminate by closing that shell, or by typing a wrong password. — Jan Christoph Terasa
– Jan Christoph Terasa, Commented May 4, 2021 at 5:53
@Barak there's another way to go about this if you want to create a file that is owned by a specific user. You can just create the file directly and chown the file to the desired user. — Shubham Vasaikar
– Shubham Vasaikar, Commented May 4, 2021 at 5:58

Barak · Accepted Answer · 2021-05-04 08:46:16Z

2

managed to do this with creating a var

demo = "su -l username -c 'command as string'"
os.system(str(demo))

answered May 4, 2021 at 8:46

Barak

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