#! /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 $HOME/.ssh in the current compute node
echo 1. Generate two files, id_rsa and id_rsa.pub, in $HOME/.ssh in the current compute node $(echo $(hostname))

if [[ -e $HOME/.ssh/id_rsa.pub ]]; then echo pub rsa exists. Will not create any.; else echo see me 1; ssh-keyscan 192.168.1.10 >> $HOME/.ssh/known_hosts; yes '' | ssh-keygen -t rsa;  fi
echo ' '
/share/apps/local/bin/coc-sshreachable
hosts=$(cat /share/tmp/ssh-reachable.dat)
TMP_PASS=$(cat $HOME/passwd.dat)
echo '$USER=' $USER 'TMP_PASS=' $TMP_PASS

for rn in $hosts
do
	#sshpass -p $TMP_PASS ssh -X -Y $rn "hostname" # worked 
	echo 2. Copy the rsa key of the $USER in the current node $(hostname) to the remote node $rn
	sshpass -p $TMP_PASS ssh-copy-id -i $HOME/.ssh/id_rsa.pub -o StrictHostKeyChecking=no $USER@$rn   ### worked
	echo ' '
	
	echo 3. Remotely generates the rsa key of the user $USER in the remote node $rn by ssh-ing from the current node $(hostname)
	sshpass -p $TMP_PASS ssh -oStrictHostKeyChecking=no $rn "if [[ -e $HOME/.ssh/id_rsa.pub ]] ; then echo Will not generate id_rsa.pub; else   
	ssh-keyscan 192.168.1.10 >> $HOME/.ssh/known_hosts; yes '' | ssh-keygen -t rsa; echo 'see me 2' ; fi"
 
	echo ' '
	
	echo 4. Remotely ssh-copy-id from the remote node $rn to the frontend	
	sshpass -p $TMP_PASS ssh -oStrictHostKeyChecking=no $rn "sshpass -p $TMP_PASS ssh-copy-id -i $HOME/.ssh/id_rsa.pub -oStrictHostKeyChecking=no $USER@192.168.1.10"
	
	if [ "$whomai" = 'root' ] 
	then
		echo i am root
	else
		if [ "$(whoami)" = 'root' ]
		then
			echo 5. I am root
		else
			echo 5. I am $(whoami). 
			sshpass -p $TMP_PASS ssh -oStrictHostKeyChecking=no $rn "/share/apps/local/bin/gen_bashrc.txt"
			echo Have done gen_bashrc in $(echo $(hostname)) 
		fi	
	fi
		
	echo ' ' 
	ip='192.168.1.10'; 
	ssh-keygen -R $ip; 
	ssh-keygen -R $(echo $(hostname)); 
	ssh-keyscan -H $ip >> $HOME/.ssh/known_hosts; 
	ssh-keyscan -H $(echo $(hostname)) >> $HOME/.ssh/known_hosts
done