soup: check for lock

[dougburks]

Background
https://groups.google.com/d/topic/security-onion/h1O2U_szyCc/discussion

Problem
Currently, soup doesn't check to see if the lock files in /var/lib/dpkg/ are locked by other processes.

Solution
Add a check like the following to the beginning of soup:

if lsof /var/lib/dpkg/lock* >/dev/null; then
	echo "/var/lib/dpkg/ is locked by another process!"
	lsof /var/lib/dpkg/lock*
	exit
fi

[dougburks]

Submitted for testing:
https://groups.google.com/d/topic/security-onion-testing/q8eEQ8sJweM/discussion

[dougburks]

Published:
https://blog.securityonion.net/2019/02/securityonion-sostat-20120722.html