#! /bin/bash

# Launch this script as $user in the current node to set up passwordless ssh to-and-fro the current node and all other nodes in the cluster for the $user
## Generate two files, id_rsa and id_rsa.pub, in /share/home/$user/.ssh in the current compute node

userhome=$(echo $HOME)

if [[ -e $userhome/.ssh/id_rsa.pub ]]; then echo "pub rsa exists. Will not creat any."; else ssh-keygen -t rsa; fi

frontend=$(cat /etc/hostname) ### this returns the frontend name

coc-sshreachable
hosts=$(cat /share/tmp/ssh-reachable.dat)

for i in $hosts
	do
		checkping=$(ping -q -c1 -W 1 $i | awk 'NR==4 {print $4}')

		if [ $checkping -eq 0 ]
		then
			echo $i is not responding to ping after 1 second
		fi

		if [ $checkping -eq 1 ]
		then
			echo $i is responding to ping within 1 second
			echo $i >> hosttemp.dat
		fi
	done
hosts=$(cat hosttemp.dat | uniq)

rm -rf hosttemp.dat
### end of script to generate ssh-reachable nodes, $hosts

for rn in $hosts
do
### 1b copy the rsa key of the $user in the current node to the remote node
	ssh-copy-id -i $userhome/.ssh/id_rsa.pub $rn

### 2a remotely generates the rsa key for the $user in the rn by ssh-ing from the current compute node.
	ssh $user@$rn "if [[ -e ~/.ssh/id_rsa.pub ]]; then  echo "pub rsa exists. Will not creat any"; else ssh-keygen -t rsa; fi"

### 2b remotely asks the rsa key for the $user in the $rn to be copied via ssh to the node from which this script is launched.
	ssh $user@$rn "ssh-copy-id -i $userhome/.ssh/id_rsa.pub $frontend"
	
	if [ $(whoami) != 'root' ]
	then
		ssh $user@$rn "/share/apps/local/bin/gen_bashrc.txt"
	fi
	
done