Reduce unnecessary tmux sessions

[dglinder]

In this task within the fix-cat2.yml playbook, specifically line 3340:

RHEL8-STIG/tasks/fix-cat2.yml

Lines 3332 to 3344 in 461d572

	- name: "MEDIUM | RHEL-08-020041 | PATCH | RHEL 8 must ensure session control is automatically started at shell initialization. | Set tmux.sh if file exists"
	ansible.builtin.blockinfile:
	path: /etc/profile.d/tmux.sh
	marker: "# <!-- {mark} ANSIBLE LOCKDOWN RHEL-08-020041 MANAGED BLOCK -->"
	block: |
	if [ "$PS1" ]; then
	parent=$(ps -o ppid= -p $$)
	name=$(ps -o comm= -p $parent)
	case "$name" in (sshd|login) exec tmux ;; esac
	fi
	create: true
	when:
	- rhel_08_020041

The system is configured to execute tmux at this line:

case "$name" in (sshd|login) exec tmux ;; esac

In situations where a person is logged, gets disconnected, and re-connects, the system executes a new tmux session.

This creates confusion as the user tries to reconnect to their previous sessions (if they are tmux savvy), or additional frustration as they (believe) they have lost their previous work (probably not true).

Changing this line to this:

case "$name" in (sshd|login) tmux a || exec tmux ;; esac

...will run tmux a to re-attach to the users pre-existing session if it exists, but if it doesn't then the exec tmux will execute the new tmux session as required.

This is related to #232 and whenever that issue is resolved, this would be a welcome enhancement to the handling of the tmux sessions for any of us who are in the command line on systems with intermittent connectivity issues.