Automat SSH Key Configuration on Remote Host

set-ssh-key.sh

#!/bin/bash
echo This script will attempt to set your public SSH key on the server you designate.

Host=$1
KeyFile=`eval echo "~$USER"`"/.ssh/id_rsa.pub"
KeyFile=${2:-$KeyFile}

# Attempt to ssh without a password
ssh -o BatchMode=yes $Host true 2> /dev/null

# If the above SSH command succeded we don't need to do anything.
if [ $? -eq 0 ];
then
  echo ---
  echo "🎉 This server is already configured. No action taken."
  exit 1
fi

if [ ! -f $KeyFile ];
then
  echo ---
  echo "😫 KeyFile '${KeyFile}' does not exist."
  exit 1
fi

echo "Host to target:  ${Host}"
echo "Public key file: ${KeyFile}"
echo ---

echo "Creating .ssh directory."
ssh $Host 'mkdir -p ~/.ssh'
echo ---
echo "Coping public key."
cat $KeyFile | ssh $Host 'cat >> ~/.ssh/authorized_keys'
echo ---
echo Attempting to connect...
ssh $Host