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Executing bash file with sudo for the second time, leads to permission denied, for some commands

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# 1  
Old 04-03-2019
Executing bash file with sudo for the second time, leads to permission denied, for commands
I have a script that checks if the script has been ran with sudo.
If the script is not ran as sudo, the current script is being executed with exec sudo bash.
You are asked for a password, you type in the password, success. Everything is perfect - the commands inside the script are ran as sudo.
However, the second time you run the script, you are getting cat: /etc/sudoers: Permission denied

What is this happening and how can this be fixed?


Output of the Script:
Code:
vaidas@vaidas-SATELLITE-L855:~$ cd Desktop
vaidas@vaidas-SATELLITE-L855:~/Desktop$ bash shellscript.sh 
sudo: a password is required
[sudo] password for vaidas: 
----------YAS HAVE SUDO----------
#
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults    env_reset
Defaults    mail_badpass
vaidas@vaidas-SATELLITE-L855:~/Desktop$ bash shellscript.sh 
----------YAS HAVE SUDO----------
head: cannot open '/etc/sudoers' for reading: Permission denied
vaidas@vaidas-SATELLITE-L855:~/Desktop$

The Script:
Code:
#!/bin/bash

if sudo -n true;
then
  echo "----------YAS HAVE SUDO----------";
  head /etc/sudoers;
  
else
  exec sudo bash "$0" "$@";
fi

Last edited by boqsc; 04-03-2019 at 04:32 PM..
# 2  
Old 04-03-2019
That you can run sudo -n true doesn't always mean you're root. Sometimes it just means you ran sudo recently enough it isn't asking for your password again. Check if UID is 0 too.
This User Gave Thanks to Corona688 For This Post:
boqsc
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