#!/usr/bin/env bash

function testSshConnection() {
  local SSH_CMD="ssh -o BatchMode=yes -o ConnectTimeout=3 $1@$2 2>&1 | grep "Host key verification failed.""
  echo "RUNNING: $SSH_CMD"
  $SSH_CMD
  PIPE_RESULT="${PIPESTATUS[0]} ${PIPESTATUS[1]}"
  echo "FUNCTION: PIPE_RESULT: ${PIPE_RESULT}"
  PIPE_RESULT_ARRAY=($PIPE_RESULT)
  PIPE0="${PIPE_RESULT_ARRAY[0]}"
  PIPE1="${PIPE_RESULT_ARRAY[1]}"
  local RC=${PIPE1:-$PIPE0}
  echo "Returning RC=$RC"
  return $RC
}

while ! testSshConnection root $1; do
  PIPE_RESULT="${PIPESTATUS[0]} ${PIPESTATUS[1]}"
  echo "WHILE: PIPE_RESULT: ${PIPE_RESULT}"
  PIPE_RESULT_ARRAY=($PIPE_RESULT)
  PIPE0="${PIPE_RESULT_ARRAY[0]}"
  PIPE1="${PIPE_RESULT_ARRAY[1]}"
  WAIT=4
  echo "Waiting $SLEEP seconds for host $1 to be accessible on port 22"
  sleep $WAIT
done

exit

~ $ /tmp/test.sh 46.101.7.220
RUNNING: ssh -o BatchMode=yes -o ConnectTimeout=3 root@46.101.7.220 2>&1 | grep "Host key verification failed."
Host key verification failed.
FUNCTION: PIPE_RESULT: 255
Returning RC=255
WHILE: PIPE_RESULT: 255
 Waiting 4 seconds for host 46.101.7.220 to be accessible on port 22
RUNNING: ssh -o BatchMode=yes -o ConnectTimeout=3 root@46.101.7.220 2>&1 | grep "Host key verification failed."
Host key verification failed.
FUNCTION: PIPE_RESULT: 255
Returning RC=255
WHILE: PIPE_RESULT: 255
...etc

~ $ ssh -o BatchMode=yes -o ConnectTimeout=3 root@46.101.7.220 2>&1 | grep "Host key verification failed."
Host key verification failed.
~ $ echo "${PIPESTATUS[0]} ${PIPESTATUS[1]}"
255 0