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The checksum post-processor computes specified checksum for the artifact list from an upstream builder or post-processor. All downstream post-processors will see the new artifacts. The primary use-case is compute checksum for artifacts allows to verify it later. So firstly this post-processor get artifact, compute it checksum and pass to next post-processor original artifacts and checksum files.
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Checksum - Post-Processors
docs-post-processors-checksum

Checksum Post-Processor

Type: checksum

The checksum post-processor computes specified checksum for the artifact list from an upstream builder or post-processor. All downstream post-processors will see the new artifacts. The primary use-case is compute checksum for artifact to verify it later.

After computes checksum for artifacts, you can use new artifacts with other post-processors like artifice, compress, docker-push, or a third-party post-processor.

Basic example

The example below is fully functional.

{
  "type": "checksum"
}

Configuration Reference

Optional parameters:

  • checksum_types (array of strings) - An array of strings of checksum types to compute. Allowed values are md5, sha1, sha224, sha256, sha384, sha512.

  • output (string) - Specify filename to store checksums. This defaults to packer_{{.BuildName}}_{{.BuilderType}}_{{.ChecksumType}}.checksum. For example, if you had a builder named database, you might see the file written as packer_database_docker_md5.checksum. The following variables are available to use in the output template:

    • BuildName: The name of the builder that produced the artifact.
    • BuilderType: The type of builder used to produce the artifact.
    • ChecksumType: The type of checksums the file contains. This should be used if you have more than one value in checksum_types.