Running a packer build which pushes an nginx-based image of a static website AWS ECR

build.sh

#!/bin/bash -v

# Add your app build steps here
# Assume that these steps produce a "dist" folder at this level

# Prepare packer variables
repoName=$1
imageVersion=$2
chmod 700 fetch.sh
./fetch.sh $repoName $imageVersion > variables.json

# Build docker image with packer
packer="/usr/local/bin/packer"
$packer build -var-file=variables.json frontend.json

fetch.sh

#!/bin/bash

# Get login details
login=`aws ecr --region us-east-1 get-login`

# Set variables
repoName=$1
imageVersion=$2
set $login
repoPrefix=$9
repoPrefix=${repoPrefix:8}

# Write values to stdout
echo "{"
echo "  \"image_version\": \"$imageVersion\","
echo "  \"aws_ecs_password\": \"$6\","
echo "  \"aws_ecs_server\": \"$9\","
echo "  \"aws_ecs_repo\": \"$repoPrefix/$repoName\""
echo "}"

frontend.json

{
  "variables": {
    "aws_ecs_repo": "",
    "aws_ecs_password": "",
    "aws_ecs_server": "",
    "image_version": ""
  },
  "builders": [
    {
      "type": "docker",
      "image": "nginx",
      "commit": "true"
    }
  ],
  "provisioners": [
    {
      "type": "file",
      "source": "dist/",
      "destination": "/usr/share/nginx/html"
    }
  ],
  "post-processors": [
    [
      {
        "type": "docker-tag",
        "repository": "{{user `aws_ecs_repo`}}",
        "tag": "{{user `image_version`}}",
        "force": true
      },
      {
        "type": "docker-push",
        "login": true,
        "login_email": "none",
        "login_username": "AWS",
        "login_password": "{{user `aws_ecs_password`}}",
        "login_server": "{{user `aws_ecs_server`}}"
      }
    ]
  ]
}