#! /bin/bash

# Launch this script as root from the frontend to set up passwordless ssh to-and-fro the frontend and all other nodes in the cluster for the user as specified in /share/apps/configrepo/users_data/newuser.dat

TMP_PASS=$(cat /share/apps/configrepo/users_data/newuser.dat | awk '{print $4}')
username=$(cat /share/apps/configrepo/users_data/newuser.dat | awk '{print $2}')
uid=$(cat /share/apps/configrepo/users_data/newuser.dat | awk '{print $3}')

echo to remove /home/$username/.ssh
rm -rf /home/$username/.ssh

## Generate two files, id_rsa and id_rsa.pub, in /home/$username/.ssh in the current compute node
echo 1. Generate two files, id_rsa and id_rsa.pub, in /home/$username/.ssh in the current compute node $(echo $(hostname))
echo to generate ssh keys
coc-gen_sshkeygen
ssh-keyscan 192.168.1.10 >> /home/$username/.ssh/known_hosts 
chown $username:users /home/$username/.ssh/known_hosts 

/share/apps/local/bin/coc-sshreachable
hosts=$(cat /share/tmp/ssh-reachable.dat)
echo 'hosts=' $hosts
#hosts=c21
for rn in $hosts
do	
	echo 'rn=' $rn
	
	echo 2. Copy the rsa key of $username in the current node $HOSTNAME to the remote node $rn. Password is $TMP_PASS
	sshpass -p $TMP_PASS ssh-copy-id -i /home/$username/.ssh/id_rsa.pub -o StrictHostKeyChecking=no $username@$rn  
	echo ' '
	
	echo 3. Remotely generates the rsa key of the user $username in the remote node $rn by ssh-ing from the current node $HOSTNAME
	sshpass -p $TMP_PASS ssh -oStrictHostKeyChecking=no $rn "if [[ -e /home/$username/.ssh/id_rsa.pub ]] ; then echo Will not generate id_rsa.pub; else ssh-keyscan 192.168.1.10 >> /home/$username/.ssh/known_hosts; yes '' | coc-gen_sshkeygen ; 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 $TMP_PASS ssh-copy-id -i /home/$username/.ssh/id_rsa.pub -oStrictHostKeyChecking=no $username@192.168.1.10"	
	
	ssh-keyscan -H $rn >> /home/$username/.ssh/known_hosts
done