prime_key.sh - Easily move an SSH key to a new VM or container

prime_key.sh

#!/bin/bash

# This script will convert a ssh private and public key into a
# series of commands that can be cut & paste into a VM to 
# prime the logged in user in the VM with the SSH key

# Author: David Bennett - david.bennett at percona dot com - 2015-07-12

# Usage: ./prime_key.sh {key base name} {new base name}

# Example:  ./prime_key.sh ~/.ssh/id_rsa vm_rsa

if [ "$1" == "" ]; then
  KEY="${HOME}/.ssh/id_rsa"
else
  KEY="$1"
fi

if [ "$2" == "" ]; then
  NEWKEY="id_rsa"
else
  NEWKEY="$2"
fi

# shellcheck disable=SC2086
if [ ! -f ${KEY} ] || [ ! -f ${KEY} ]; then
  echo "Could not find ${KEY} or ${KEY}.pub"
  exit 1;
fi

# echo the commands

cat <<_EOF_

# --- start copy ---
cd ~
mkdir -p .ssh
chmod 700 .ssh
cd .ssh
cat <<_EOKEY_ > ${NEWKEY}
_EOF_
# shellcheck disable=SC2086
cat ${KEY}

cat <<_EOF_
_EOKEY_
chmod 600 ~/.ssh/${NEWKEY}
cat <<_EOPUB_ > ${NEWKEY}.pub
_EOF_
# shellcheck disable=SC2086
cat ${KEY}.pub

cat <<_EOF_
_EOPUB_
chmod 600 ~/.ssh/${NEWKEY}.pub
cd ~
# --- end copy ---

_EOF_