# rename hostname.test.com into hostname as minion id.
# as root user on salt-master
MID=${1?Minion ID required}
NEW_MID=${2?New minion ID required}

set -e

try_ping() {
  echo -n "Pinging $1 -- "
  salt "$1" test.ping | grep -E '^\s+True$' > /dev/null 2>&1 && {
    echo Responded
  } || {
    echo No response
    return 1
  }
}

echo Renaming minion \"${MID}\" to \"${NEW_MID}\"

try_ping "${MID}"

echo Rewriting /etc/salt/minion_id
salt "${MID}" cmd.run "echo \"${NEW_MID}\" > /etc/salt/minion_id"

echo Restarting salt minion
salt "${MID}" service.restart salt-minion

PKI_FROM="/etc/salt/pki/master/minions/${MID}"
PKI_TO="/etc/salt/pki/master/minions/${NEW_MID}"
echo "Moving PKI files from '${PKI_FROM}' to '${PKI_TO}'"
mv -f "${PKI_FROM}" "${PKI_TO}"

echo Sleeping for three seconds
sleep 3
try_ping "${NEW_MID}" || {
  echo Trying again --
  try_ping "${NEW_MID}" || {
    echo This might take a minute, keep checking:
    echo "  salt \"${NEW_MID}\" test.ping"
  }
}