Installing Git in Ubuntu using Python script

Question

I'm trying to write a script which checks for prerequisite software in Ubuntu and if not installed, goes ahead and installs it.

I'm a newbie to Python and I understand that Python's subprocess module can be used to achieve this goal.

I have written this below sample code but not sure why it is failing.

import subprocess
c = subprocess.Popen(['sudo','apt-get','install','git'], stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.STDOUT)
grep_stdout = c.communicate(input='root')[0]
print(grep_stdout)

When I run this program, i get the following error...

sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: no tty present and no askpass program specified
Sorry, try again.
sudo: 3 incorrect password attempts

Am i missing something here?

Why are you writing this script in Python? Ubuntu's package management works perfectly well as is. — David Cain
– David Cain, Commented Jun 25, 2012 at 7:37
If your program is dependent on Git, I'd advocate just letting it fail gracefully when Git's not present, and leave it up to the user to install/compile Git as they wish. — David Cain
– David Cain, Commented Jun 25, 2012 at 7:43
There are significant amount of pre-requisite . I just thought asking user to install all of them would be a pain in the neck. so just thought of writing a function which will test the software and if something not installed will go ahead and install for him — Vijay
– Vijay, Commented Jun 25, 2012 at 8:44
A reasonable thought process. @Burhan's answer is fantastic, and covers all the main options you have. — David Cain
– David Cain, Commented Jun 25, 2012 at 9:10

Burhan Khalid · Accepted Answer · 2012-06-25 09:01:24Z

There are significant amount of pre-requisite . I just thought asking user to install all of them would be a pain in the neck. so just thought of writing a function which will test the software and if something not installed will go ahead and install for him

There are a few approaches to this:

Check if software is there, if it isn't exit the program with a message listing the missing components to be installed.
Provide a list of software that needs to be installed in README or documentation.
Create a debian package listing the dependencies required; and have the user install this with their preferred method.

If your program must install the software itself (does it really have to?), then instruct the user to run your script with elevated privileges. In your documentation, ask them to run it as root.

By the way sudo may not be installed on all systems.

Kevin Renskers · Accepted Answer · 2020-02-26 11:14:26Z

1

import subprocess

c = subprocess.Popen(['sudo','yum','install','git','-y'], 
stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.STDOUT)
grep_stdout = c.communicate(input='root')[0]

print(grep_stdout)

edited Feb 26, 2020 at 11:14

Kevin Renskers

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answered Feb 26, 2020 at 10:44

Bharath Chandra Nannaka

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2 Comments

Bharath Chandra Nannaka Over a year ago

install git on centos or RHEL using python

Justice_Lords Over a year ago

Please if you are typing a code codeify it by pressing Ctrl+K. And also explain your answer so that others can understand it.

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