packer-cn/website/pages/docs/post-processors/artifice.mdx

---
description: >
  The artifice post-processor overrides the artifact list from an upstream

  builder or post-processor. All downstream post-processors will see the new

  artifacts you specify. The primary use-case is to build artifacts inside a

  packer builder -- for example, spinning up an EC2 instance to build a docker

  container -- and then extracting the docker container and throwing away the
  EC2

  instance.
layout: docs
page_title: Artifice - Post-Processors
sidebar_title: Artifice
---

# Artifice Post-Processor

Type: `artifice`

The artifice post-processor overrides the artifact list from an upstream
builder or post-processor. All downstream post-processors will see the new
artifacts you specify.

After overriding the artifact with artifice, you can use it with other
post-processors, including most of the core post-processors and third-party
post-processors.

A major benefit of this is that you can modify builder
artifacts using shell-local and pass those modified artifacts into
post-processors that may not have worked with the original builder.
For example, maybe you want to export a docker container from an amazon-ebs
builder and then use Docker-push to put that Docker container into your Docker
Hub account.

Artifice allows you to use the familiar packer workflow to create a fresh,
stateless build environment for each build on the infrastructure of your
choosing. You can use this to build just about anything: buildpacks,
containers, jars, binaries, tarballs, msi installers, and more.

Please note that the artifice post-processor will _not_ delete your old artifact
files, even if it removes them from the artifact. If you want to delete the
old artifact files, you can use the shell-local post-processor to do so.

## Workflow

Artifice helps you tie together a few other packer features:

- A builder, which spins up a VM (or container) to build your artifact
- A provisioner, which performs the steps to create your artifact
- A file provisioner, which downloads the artifact from the VM
- The artifice post-processor, which identifies which files have been
  downloaded from the VM
- Additional post-processors, which push the artifact to Docker hub, etc.

You will want to perform as much work as possible inside the VM. Ideally the
only other post-processor you need after artifice is one that uploads your
artifact to the appropriate repository.

## Configuration

The configuration allows you to specify which files comprise your artifact.

### Required:

- `files` (array of strings) - A list of files that comprise your artifact.
  These files must exist on your local disk after the provisioning phase of
  packer is complete. These will replace any of the builder's original
  artifacts (such as a VM snapshot).

### Optional:

- `keep_input_artifact` (boolean) - if true, do not delete the original
  artifact files after creating your new artifact. Defaults to true.

### Example Configuration

This minimal example:

1.  Spins up a cloned VMware virtual machine
2.  Installs a [consul](https://www.consul.io/) release
3.  Downloads the consul binary
4.  Packages it into a `.tar.gz` file
5.  Uploads it to S3.

VMX is a fast way to build and test locally, but you can easily substitute
another builder.

```json
{
  "builders": [
    {
      "type": "vmware-vmx",
      "source_path": "/opt/ubuntu-1404-vmware.vmx",
      "ssh_username": "vagrant",
      "ssh_password": "vagrant",
      "shutdown_command": "sudo shutdown -h now",
      "headless": "true",
      "skip_compaction": "true"
    }
  ],
  "provisioners": [
    {
      "type": "shell",
      "inline": [
        "sudo apt-get install -y python-pip",
        "sudo pip install ifs",
        "sudo ifs install consul --version=0.5.2"
      ]
    },
    {
      "type": "file",
      "source": "/usr/local/bin/consul",
      "destination": "consul",
      "direction": "download"
    }
  ],
  "post-processors": [
    [
      {
        "type": "artifice",
        "files": ["consul"]
      },
      {
        "type": "compress",
        "output": "consul-0.5.2.tar.gz"
      },
      {
        "type": "shell-local",
        "inline": [
          "/usr/local/bin/aws s3 cp consul-0.5.2.tar.gz s3://<s3 path>"
        ]
      }
    ]
  ]
}
```

**Notice that there are two sets of square brackets in the post-processor
section.** This creates a post-processor chain, where the output of the
proceeding artifact is passed to subsequent post-processors. If you use only
one set of square braces the post-processors will run individually against the
build artifact (the vmx file in this case) and it will not have the desired
result.

```json
{
  "post-processors": [
    [       // <--- Start post-processor chain
      {
        "type": "artifice",
        "files": ["consul"]
      },
      {
        "type": "compress",
        ...
      }
    ],      // <--- End post-processor chain
    {
      "type":"compress"  // <-- Standalone post-processor
    }
  ]
}
```

You can create multiple post-processor chains to handle multiple builders (for
example, building linux and windows binaries during the same build).