dockerinit

#!/bin/bash
#####################################################################################
#
# USAGE: source dck-init
#
# logged in   | OK          | docker login, sets env for
#             |             | DOCKER_USER, DOCKER_PASSWORD
#             |             |
#             | NOK         | error message from docker login,
#             |             | env is cleared
#             |             |
# logged out  | n/a         | "please log out of docker first!"
#####################################################################################

function login() {
  local _result=$1
  #echo logging $user into docker...
  local result=$(echo "$password" | docker login -u $user --password-stdin)

  if [[ "$_result" ]]; then
    eval $_result="'$result'"
  else
    echo "$result"
  fi
}

function setEnv() {

  echo "setting environment for user $user..."
  export DOCKER_USER=$user
  export DOCKER_PASSWORD=$password
}

function clearEnv() {
  echo "clearing environment.."
  unset DOCKER_USER
  unset DOCKER_PASSWORD
}

function isLoggedIn() {
  local file="/home/$USER/.docker/config.json"
  local loggedIn
  local _result=$1

  if [[ -f $file ]]; then
    local auth=$(cat $file | jq '.auths."https://index.docker.io/v1/".auth')
    if [[ "$auth" = null ]]; then
      loggedIn=false
    else
      loggedIn=true
    fi
  else
    loggedIn=false
  fi

  if [[ "$_result" ]]; then
    eval $_result="'$loggedIn'"
  else
    echo "$loggedIn"
  fi
}

#####################################################################################
### MAIN SECTION ###
#####################################################################################
user=rabaul

# have we been given a password as parameter ?
if [ $# -eq 0 ]; then
  #No
  # retrieve credentials from user
  #echo Dockerhub user name ?
  #read user
  echo "Dockerhub password for ${user}?"
  read -s password
else
  #yes
  password=$1
fi

# make sure credentials match auth token
loggedIn=$(isLoggedIn)
if [[ "$loggedIn" = true ]]; then
  echo "logging out of docker first..."
  docker logout
fi

# login with credentials
loginResult=$(login)
echo "$loginResult"
if [[ "$loginResult" = "Login Succeeded" ]]; then
  setEnv
else
  echo "failure to log in user $user"
  clearEnv
fi